Battery box

Abstract

The present invention discloses a battery box, comprising: a side frame, a bottom plate assembly and a collecting pipe, wherein the side frame defines a cavity with an opening, the bottom plate assembly closes the opening of the cavity, the bottom plate assembly comprises a heat exchange plate, the heat exchange plate has a heat exchange cavity for circulating a heat exchange medium, and the collecting pipe is arranged in the cavity and communicated with the heat exchange cavity. A collecting pipe is arranged in the cavity of the side frame of the battery box, so that the collecting pipe exists in a separate closed cavity, which is independent of the battery module installation space, effectively solving the risk of heat exchange medium leaking into the battery module installation space, and the close combination of the side frame and the bottom plate assembly can make the overall structure of the battery box more compact, optimize the use of space, and make the reliability of the battery box higher.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a battery box. Background Art

[0002] The battery case of a traditional battery pack does not fully utilize the internal structure of the battery case, resulting in the heat exchange components of the battery pack being arranged within the battery module installation space. When the heat exchange components leak, it will cause damage to the battery module. In addition, the various components of the battery case are not tightly connected, and there is room for improvement. Summary of the invention

[0003] The present invention aims to solve at least one of the above technical problems in the prior art to a certain extent. To this end, the present invention provides a battery box, which has a more compact overall structure and higher safety.

[0004] According to an embodiment of the present invention, the battery case comprises: a side frame, a bottom plate assembly and a collecting pipe, wherein the side frame defines a cavity with an opening, the bottom plate assembly closes the opening of the cavity, the bottom plate assembly comprises a heat exchange plate, the heat exchange plate has a heat exchange cavity for circulating a heat exchange medium, and the collecting pipe is disposed in the cavity and communicated with the heat exchange cavity.

[0005] According to the battery case of an embodiment of the present invention, a collecting tube is arranged in the cavity of the side frame of the battery case, so that the collecting tube exists in a separate closed cavity and is independent of the battery module installation space, which effectively solves the risk of heat exchange medium leaking into the battery module installation space, and the close combination of the side frame and the bottom plate assembly can make the overall structure of the battery case more compact, optimize the use of space, and make the battery case highly reliable.

[0006] In addition, the battery box according to the embodiment of the invention may also have the following additional technical features:

[0007] According to some embodiments of the present invention, the side frame includes a first end arm, a second end arm and an isolation segment, the isolation segment is connected between the first end arm and the second end wall, and the first end arm, the second end arm and the isolation segment define the cavity.

[0008] According to some embodiments of the present invention, the bottom plate assembly includes heat exchange plates and support plates that are arranged in a staggered manner, and the first end arm of the side frame is connected to the upper surfaces of the heat exchange plates and the support plates.

[0009] According to some embodiments of the present invention, an end of the support plate is connected to a second end arm of the side frame to close the opening of the cavity at a corresponding position.

[0010] According to some embodiments of the present invention, the bottom plate assembly further includes a patch plate, which is connected to the second end arm of the side frame and the end of the heat exchange plate to close the opening of the cavity at a corresponding position.

[0011] According to some embodiments of the present invention, the patch plate has a first end, a second end, and a third end and a fourth end that are relatively set; the first end of the patch plate is connected to the second end arm of the side frame, and the second end of the patch plate is connected to the end of the heat exchange plate; at least one of the third end and the fourth end of the patch plate is connected to the adjacent support plate.

[0012] According to some embodiments of the present invention, the collecting pipeline includes a collecting pipe and a pipe joint, the collecting pipe is arranged at the end of the heat exchange plate and communicates with the heat exchange cavity, and the pipe joint connects two adjacent collecting pipes.

[0013] According to some embodiments of the present invention, the heat exchange chambers of the multiple heat exchange plates are connected in parallel through the collecting pipe and the pipe joint connecting two adjacent collecting pipes, and the heat exchange medium flows from one end of the multiple heat exchange plates to the other end in the same direction in the multiple heat exchange chambers inside the multiple heat exchange plates.

[0014] According to some embodiments of the present invention, the battery box further comprises: a flow distribution component, the flow distribution component is sandwiched between the heat exchange plate and the collecting pipe, the flow distribution component has a plurality of groups of throttling holes, and the collecting pipe is connected to the heat exchange chamber through the throttling holes.

[0015] According to some embodiments of the present invention, the manifold has a main flow cavity and a plurality of branch holes connected to the main flow cavity, the branch holes are arranged corresponding to the throttling holes, and the plurality of heat exchange cavities of the heat exchange plate are connected in parallel through the manifold.

[0016] According to some embodiments of the present invention, the flow distribution component adjusts the flow by adjusting the number and / or position and / or aperture of the throttling holes.

[0017] According to some embodiments of the present invention, the flow area of ​​the throttling hole is smaller than the flow area of ​​the open end of the heat exchange chamber, and the flow area of ​​the throttling holes at both ends of the flow distribution component is larger than the flow area of ​​the throttling hole in the middle.

[0018] According to some embodiments of the present invention, at least one of the plurality of manifolds has a connection port for communicating with an external waterway, and a total flow area of ​​all throttling holes in the flow distribution component increases as the distance from the flow distribution component to the connection port increases.

[0019] According to some embodiments of the present invention, the battery box also includes: a box cross beam, wherein both ends of the box cross beam are welded to the side frames, and the bottom surface of the box cross beam is welded to the support plate; and a box longitudinal beam, wherein both ends of the box longitudinal beam are welded to the side frames, and the bottom surface of the box longitudinal beam is bonded to the upper surface of the bottom plate assembly by adhesive.

[0020] According to some embodiments of the present invention, the side frame further includes an energy absorbing structure for absorbing energy generated during a collision.

[0021] According to some embodiments of the present invention, the side frame further includes: a protective structure for protecting the cavity.

[0022] According to some embodiments of the present invention, the energy absorbing structure and / or the protective structure is of a cavity type.

[0023] According to some embodiments of the present invention, reinforcing ribs are provided in the cavity to divide the cavity into multiple parts.

[0024] According to some embodiments of the present invention, the bottom plate assembly includes heat exchange plates and support plates that are arranged in a staggered manner, and the heat exchange plates and the support plates are plug-connected via a plug-in structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a partial structure of a battery box according to an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of a partial structure of a battery box according to an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of a partial structure of a battery box according to an embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of a partial structure of a battery box according to an embodiment of the present invention;

[0029] Figure 5 is a partial cross-sectional view of a battery box according to an embodiment of the present invention;

[0030] Figure 6 is a partial cross-sectional view of a battery box according to an embodiment of the present invention;

[0031] Figure 7 is a partial cross-sectional view of a battery box according to an embodiment of the present invention;

[0032] Figure 8 is a schematic diagram of a partial structure of a battery box according to an embodiment of the present invention;

[0033] Fig. 9is a schematic diagram of a partial structure of a battery box according to an embodiment of the present invention;

[0034] Fig.10 is a partial cross-sectional view of a battery box according to an embodiment of the present invention;

[0035] Fig.11 is a schematic diagram of the structure of a flow distribution component according to an embodiment of the present invention;

[0036] Fig.12 is a schematic diagram of the structure of a flow distribution component according to an embodiment of the present invention;

[0037] Fig.13 is a partial cross-sectional view of a battery box according to an embodiment of the present invention;

[0038] Fig.14 is a schematic structural diagram of a pipe joint according to an embodiment of the present invention;

[0039] Fig.15 is a schematic diagram of a partial structure of a pipe joint according to an embodiment of the present invention;

[0040] Fig.16 is a cross-sectional view of a pipe joint according to an embodiment of the present invention;

[0041] Fig.17 is a partial cross-sectional view of a pipe joint according to an embodiment of the present invention;

[0042] Fig.18 is a schematic diagram of a partial structure of a pipe joint according to an embodiment of the present invention;

[0043] Fig.19 is a schematic diagram of a partial structure of a battery box according to an embodiment of the present invention;

[0044] Fig. 20 is a partial cross-sectional view of a battery box according to an embodiment of the present invention;

[0045] Fig.21 is a partial cross-sectional view of a battery case according to an embodiment of the present invention.

[0046] Reference numerals:

[0047] Battery box 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, throttle hole 41, main flow cavity 311, branch hole 312, connection port 313, box cross beam 5, box longitudinal beam 6, energy absorption structure 15, protective structure 16, reinforcing rib 17, upper protective section 161, outer protective section 162, boss 212, overlap edge 314, plug Groove 7, plug-in boss 8, guide surface 81, support surface 71, side plate 82, step surface 72, first leg 213, weight reduction cavity 221, second leg 222, bottom guard plate 301, protective cavity 302, end throttle hole 411, middle throttle hole 412, connecting pipe 321, sealing sleeve 322, sealing structure 3221, first structure 3222, notch 32221, sleeve body section 3223, sealing section 3224, sealing ring 32211, groove 32212, axial limit flange 3225, mounting groove 3211, battery module 400. DETAILED DESCRIPTION

[0048] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0053] Reference below Figure 1-Figure 21 A battery case 100 according to an embodiment of the present invention is described.

[0054] The battery box 100 according to the embodiment of the present invention may include: a side frame 1 , a bottom plate assembly 2 and a current collecting pipe 3 .

[0055] like Fig. 9 , Fig. 20 and Fig.21 As shown, the frame body is a structure independent of the installation space of the battery module 400 (battery compartment), and has an open cavity 11 therein. The cavity 11 is used to accommodate the collector 31 arranged inside the cavity 11, wherein the installation space of the battery module 400 is defined by the bottom plate assembly 2, and the battery module 400 is arranged on the bottom plate assembly 2 with heat exchange function. The bottom plate assembly 2 is suitable for closing the opening of the cavity 11 to completely confine the collector 31 in the cavity 11, thereby making the three form a complete whole with a more compact structure.

[0056] Further, if Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 8 and Fig.19As shown, the bottom plate assembly 2 includes a heat exchange plate 21, which has a heat exchange cavity 211 for circulating heat exchange medium. The collecting pipe 31 is suitable for communicating with the heat exchange cavity 211 to input the heat exchange medium entering the collecting pipe 31 from the outside into the heat exchange plate 21, thereby realizing effective heat exchange of the battery module 400.

[0057] In other words, the collecting tube 31 is arranged in the cavity 11 of the frame body which is independent of the installation space of the battery module 400. Therefore, when the collecting tube 31 leaks, the leaked heat exchange medium will not flow into the installation space of the battery module 400, and will not affect the battery module 400, so as to reduce the risk of damage to the battery module 400.

[0058] Furthermore, arranging the collector 31 in the cavity within the frame body can make the overall structure of the battery pack more compact and optimize the use of space. The frame body also has a protective effect on the collector 31, which has higher reliability, thereby improving the safety performance of the battery pack.

[0059] According to the side frame 1 of the battery case 100 of the embodiment of the present invention, a collecting pipe 31 is arranged in the cavity of the side frame 1 of the battery case 100, so that the collecting pipe 31 exists in a separate closed cavity 11, which is independent of the installation space of the battery module 400, thereby effectively solving the risk of heat exchange medium leaking into the installation space of the battery module 400, and the close combination of the side frame 1 and the bottom plate assembly 2 can make the overall structure of the battery case 100 more compact, optimize the use space, and make the reliability of the battery case 100 high.

[0060] Combination Fig. 20 and Fig.21 In the illustrated embodiment, the frame body includes a first end arm 12, a second end arm 13 and an isolation segment 14, wherein the isolation segment 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 segment 14 define a cavity 11 open downwardly, wherein the bottom plate assembly 2 includes staggered heat exchange plates 21 and support plates 22, 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 inwardly, so that the heat exchange plate 21 can extend from the opening into the cavity 11 and be connected to the collecting pipe 31, so as to realize the circulation flow of the heat exchange medium in the entire battery pack heat exchange system.

[0061] Further, if Fig. 20 As shown, 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 that opens to the inside, thereby achieving complete sealing of the cavity, so as to prevent the heat exchange medium leaking from the collecting pipe 31 from flowing into the installation space of the battery module 400 from this opening, so as to ensure the safety of the battery module 400.

[0062] Furthermore, since the support plate 22 does not need to be connected to the branch hole 312 of the manifold 31, the end of the support 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 support plate 22 also plays a role in supporting the manifold 31, so that the manifold 31 can be more stably arranged in the cavity.

[0063] like Fig.21 As shown, 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. Therefore, the bottom plate assembly 2 is also provided with a patch plate 23, so that the patch plate 23 is connected to 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. In addition, the patch plate 23 also plays a role in supporting the header 31, so that the header 31 can be more stably arranged in the cavity.

[0064] Preferably, the manifold 31 and the patch plate 23 are indirectly fixed using a high temperature resistant structural adhesive to achieve a better fixing effect.

[0065] Further, refer to Fig.21 The patch plate 23 has a first end, a second end, and a third end and a fourth end that are relatively arranged, and the above four ends are the four sides of the patch plate 23. Among them, the first end (lateral outer end) of the patch plate 23 is connected to the second end arm 13 of the side frame 1, the second end (lateral inner end) of the patch plate 23 is connected to the end of the heat exchange plate 21, and at least one of the third end and the fourth end (longitudinal ends) of the patch plate 23 is connected to the adjacent support plate 22. In this way, the patch plate 23 can be connected to all the surrounding components to form a whole, thereby making the overall strength of the battery box 100 greater.

[0066] According to some embodiments of the present invention, Figure 8 and Fig.19 As shown, the manifold 3 includes a manifold 31 and a pipe joint 32. The manifold 31 is arranged at the end of the heat exchange plate 21 and communicates with the heat exchange cavity 211, so as to transport the heat exchange medium entering the manifold 31 from the outside to the heat exchange cavity 211, so as to realize the heat exchange effect of the heat exchange plate 21. Two adjacent manifolds 31 are connected by a pipe joint 32, so that multiple manifolds 31 and heat exchange plates 21 are connected to form a complete heat exchange system, that is, a thermal management system. Thus, a thermal management system with a more compact overall structure is formed.

[0067] Furthermore, each heat exchange plate 21 is provided with a plurality of heat exchange chambers 211 arranged side by side, and both ends of the heat exchange plate 21 are connected to a collecting pipe 31, and the plurality of heat exchange chambers 211 are connected in parallel through the collecting pipe 31, and the collecting pipes 31 between two adjacent heat exchange plates 21 are connected through a pipe joint 32 to realize the parallel connection between the heat exchange chambers 211 of two adjacent heat exchange plates 21, thereby making all the heat exchange chambers 211 of all the heat exchange plates 21 form a complete thermal management system in parallel.

[0068] Specifically, each heat exchange plate 21 has a plurality of heat exchange chambers 211 arranged in parallel, wherein the heat exchange medium flows from one end of the plurality of heat exchange plates 21 to the other end along the same direction of the plurality of heat exchange chambers 211 inside the plurality of heat exchange plates 21, that is, the plurality of heat exchange chambers 211 are arranged in parallel. Thus, the heat exchange medium can flow through each heat exchange chamber 211 more evenly, avoiding the occurrence of local eddy currents, and making the heat exchange effect of each part of the heat exchange plate 21 more balanced, thereby making the heat exchange effect of the heat exchange plate 21 better.

[0069] like Figure 8 , Fig.14 As shown, the pipe joint 32 is used to connect with the collecting pipe 31 to communicate with adjacent heat exchange plates 21, wherein the sealing sleeve 322 is sleeved outside the end of the connecting pipe 321, the connecting pipe 321 is used to connect two adjacent collecting pipes 31, and the sealing sleeve 322 is used to seal the connection between the connecting pipe 321 and the collecting pipe 31.

[0070] Optionally, the sealing sleeve 322 may be made of rubber or silicone, and the connecting tube 321 may be made of a metal tube or a plastic tube, and the two may be bonded together by glue or directly injection molded to ensure the connection stability of the two and the overall setting stability of the pipe joint 32. The plastic tube can eliminate the influence of the extrusion force during the side extrusion process to ensure the sealing performance of the connecting tube 321, and further ensure the reliability of the pipe joint 32.

[0071] Further, refer to Fig.14 and Fig.15 The sealing sleeve 322 is provided with a sealing structure 3221 and a first structure 3222 which are arranged in an axial direction and spaced apart from each other, wherein the sealing structure 3221 is used to seal the connection between the connecting pipe 321 and the manifold 31, so as to achieve sealing by means of interference fit. Since the interference fit is used, even if there is a slight deviation in the coaxiality between the pipe joint 32 and the manifold 31 after installation, the sealing effect can be ensured.

[0072] Moreover, compared with the traditional assembly method of clamps or quick connectors, this interference fit method requires less installation space, has a simple structure, is easy to install, and has a relatively low cost.

[0073] Refer to 14- Fig.18The first structure 3222 is used to guide the pipe joint 32 and the manifold 31 during assembly to ensure that the two can be installed in a centered manner, thereby ensuring the installation precision and accuracy, and effectively improving the sealing of the connection between the two.

[0074] Furthermore, the first structure 3222 includes a plurality of sections arranged at intervals along the circumference of the sealing sleeve 322, and the plurality of sections of the first structure 3222 are arranged around the sealing sleeve 322 to form a gap 32221 between two adjacent sections. When the pipe joint 32 and the manifold 31 are installed, the sealing structure 3221 can be contacted from the outside through the gap 32221. Thus, the provision of the gap 32221 can realize the airtightness detection function. When the sealing structure 3221 fails to seal, air leakage will occur from the sealing structure 3221. Therefore, the detection personnel can use the detection tool to pass through the gap 32221 and contact the sealing structure 3221 to detect the airtightness of the sealing structure 3221, so as to determine whether the sealing structure 3221 is intact.

[0075] Combination Figure 14-18 In the illustrated embodiment, the sealing sleeve 322 includes a sleeve body section 3223 and a sealing section 3224 which are connected in the axial direction. The sealing structure 3221 is arranged on the sealing section 3224 to achieve the sealing between the pipe joint 32 and the collecting pipe 31. The first structure 3222 is arranged on the sleeve body section 3223 to ensure the centering installation of the two. Therefore, by reasonably dividing the sealing sleeve 322 into two parts, the structures with different functions and effects can be integrated on the same sealing sleeve 322 to realize the centralized setting of the structure, which can make the overall structure of the pipe joint 32 more compact.

[0076] The diameter of the sealing section 3224 gradually decreases from the middle to the two ends, thereby effectively compensating for the installation tolerance of each part to achieve a better sealing effect.

[0077] Further, refer to Figure 14-18 The first structure 3222 is spaced apart from the sealing section 3224 to prevent the centering of the first structure 3222 from affecting the sealing fit between the sealing structure 3221 on the sealing section 3224 and the manifold 31, and also to prevent the sealing structure 3221 from affecting the guiding and centering function of the first structure 3222, so that the two will not interfere with each other in terms of functionality and structure.

[0078] like Figure 14-18As shown, the sealing structure 3221 includes a plurality of sealing rings 32211 arranged in sequence along the axial direction, and the diameter of the sealing ring 32211 distributed in the middle is larger than the diameter of the sealing rings 32211 distributed at both ends. Therefore, by setting a plurality of sealing rings 32211 to achieve multi-stage sealing between the pipe joint 32 and the manifold 31, the sealing effect can be better, and the setting of different diameters of the sealing rings 32211 can effectively compensate for the coaxiality between the components, so as to compensate for the installation tolerance and ensure the installation accuracy.

[0079] Further, refer to Fig.15 , Fig.17 and Fig.18 An arc-shaped groove 32212 is provided between two adjacent sealing rings 32211. The groove 32212 is provided to reserve space for the compression of the sealing ring 32211, so that the sealing ring 32211 can be fully compressed when it is squeezed against the inner wall of the manifold 31, thereby making the sealing ring 32211 fit more closely against the inner wall of the manifold 31, so as to achieve a better sealing effect.

[0080] Combination Fig.14 and Fig.15 In the embodiment shown, the axial thickness of the first structure 3222 is greater than the axial thickness of the sealing ring 32211. Since the first structure 3222 is to be guided and matched with the inner wall of the manifold 31 to achieve the centering installation of the two, the strength of the first structure 3222 is relatively large, and thus the thickness of the first structure 3222 is set to be larger than that of the sealing ring 32211.

[0081] like Fig.14 and Fig.15 As shown, the sealing sleeve 322 is also provided with an axial limit flange 3225, which can play a limiting role during the assembly process and use of the pipe joint 32 and the collecting pipe 31, and after the assembly is completed, the axial limit flange 3225 is suitable for abutting against the outer end wall of the collecting pipe 31 to play a limiting role, thereby ensuring that the pipe joint 32 is always in a good sealing state.

[0082] Specifically, the sealing structure 3221, the first structure 3222, and the axial limit flange 3225 are arranged inwardly from the end of the sealing sleeve 322 in the axial direction to avoid mutual interference in the structures and functions of the three. Among them, the axial limit flange 3225 is used to press against the end face of the pipeline (collecting pipe 31) to be connected, and the arc of the axial limit flange 3225 is less than 270° to form a through hole, so that at least part of the notch 32221 can be directly opposite to the area (through hole) without the axial limit flange 3225, so that the inspection personnel can use the inspection tool to pass through the axial limit flange 3225 and the first structure 3222 in turn to perform a sealing inspection on the sealing structure 3221.

[0083] According to other embodiments of the present invention, Figure 16-18 As shown, the end portion of the connecting pipe 321 is recessed inward to form a mounting groove 3211, and the sealing sleeve 322 is sleeved in the mounting groove 3211 to achieve stable installation. The sealing sleeve 322 can be integrally injection molded in the mounting groove 3211 using EPDM material to achieve a stable connection between the two. By integrally injection molding the two, the sealing sleeve 322 can be prevented from being missed or lost during transportation, and it will not become loose during vibration, and the probability of leakage is also very small.

[0084] Furthermore, the sealing structure 3221 and the first structure 3222 protrude from the mounting groove 3211 so as to be abutted against the inner wall of the manifold 31 to achieve a stable sealing effect.

[0085] Further, combined with Figure 16-18 In the illustrated embodiment, the connecting pipe 321 is provided with an axial limit flange 3225. That is, the axial limit flange 3225 is directly formed on the outer peripheral surface of the connecting pipe 321 to ensure the stability of the axial limit flange 3225. The axial limit flange 3225 can play a limiting role in the assembly process and use process of the pipe joint 32 and the manifold 31, and after the assembly is completed, the axial limit flange 3225 is suitable for abutting against the outer end wall of the manifold 31 to play a limiting role, ensuring that the pipe joint 32 is always in a good sealing state.

[0086] Among them, the sealing structure 3221, the first structure 3222, and the axial limit flange 3225 are arranged inwardly from the end of the connecting pipe 321 in the axial direction to avoid mutual interference in the structures and functions of the three. The axial limit flange 3225 is used to press against the end face of the pipeline (collecting pipe 31) to be connected, and the arc of the axial limit flange 3225 is less than 270° to form a through hole, so that at least part of the notch 32221 can be directly opposite to the area (through hole) without the axial limit flange 3225, so that the inspection personnel can use the inspection tool to pass through the axial limit flange 3225 and the first structure 3222 in turn to perform a sealing inspection on the sealing structure 3221.

[0087] Reference Figure 8 and Fig.19 The heat exchange plate 21 is provided with a heat exchange cavity 211 for circulating coolant to exchange heat with the battery module 400 disposed on the heat exchange plate 21. The open end of the heat exchange cavity 211 is connected to a manifold 31, which is suitable for diverting the coolant entering the battery pack from the outside to evenly distribute it to each heat exchange cavity 211. Among them, both ends of the connecting pipe 321 are covered with a sealing sleeve 322 (refer to Fig.14 and Fig.16), the two manifolds 31 are connected via a pipe joint 32 to achieve the series connection of multiple manifolds 31 and the parallel connection of multiple heat exchange chambers 211 (refer to Figure 8 and Fig.19 ).

[0088] like Figure 8 As shown, specifically, the collecting pipe 31 is sleeved outside the sealing sleeve 322 to achieve a stable sealed connection between the two, and the connection distance between the two can be shortened to make the overall structure of the battery pack heat exchange system more compact.

[0089] According to some embodiments of the present invention, further, in combination Figure 11-13 In the embodiment shown, in order to evenly and reasonably distribute the flow of the heat exchange medium in each heat exchange chamber 211, a flow distribution component 4 is provided in the embodiment of the present invention, and the flow distribution component 4 is sealed at the open end of the heat exchange chamber 211 to achieve the effect of average flow distribution.

[0090] The flow distribution component 4 has a throttling hole 41 connected to the heat exchange cavity 211. Specifically, the heat exchange medium in the manifold 31 needs to pass through the throttling hole 41 to flow into the heat exchange cavity 211. Therefore, reasonable flow division and throttling can be achieved by changing the aperture and number of the throttling holes 41 corresponding to the heat exchange cavities 211 at different positions, so that the flow rate of the heat exchange medium flowing into each heat exchange cavity 211 can be equal.

[0091] like Fig.13 As shown, the manifold 31 is connected to the heat exchange plate 21 so that the flow distribution component 4 can be stably sandwiched between the manifold 31 and the heat exchange plate 21 to achieve a stable flow equalization effect.

[0092] Reference Fig.11 The heat exchange plate 21 is provided with a plurality of longitudinally penetrating heat exchange chambers 211 to realize the circulation and heat exchange of the heat exchange medium, and the flow distribution component 4 is provided with a plurality of groups of throttling holes 41, and the plurality of heat exchange chambers 211 correspond to the plurality of groups of throttling holes 41 one by one, and the plurality of heat exchange chambers 211 are connected in parallel through the plurality of branch holes 312 of the header 31. Thus, the purpose of using the same header 31 to supply liquid to the plurality of heat exchange chambers 211 is achieved, and each heat exchange chamber 211 can be arranged in parallel.

[0093] In short, the heat exchange medium flows from the same end of the multiple heat exchange chambers 211 to the other end of the heat exchange chamber 211, which can make the heat exchange more balanced and avoid the occurrence of local eddy currents that affect the normal heat exchange of the heat exchange plate 21, thereby making the heat exchange effect of the heat exchange plate 21 better.

[0094] like Figure 11-13As shown, the flow distribution component 4 is plate-shaped. As the name implies, the flow distribution component 4 is a thinner component so that it can be clamped between the collecting pipe 31 and the heat exchange plate 21, wherein the throttling hole 41 penetrates the flow distribution component 4 along the thickness direction of the flow distribution component 4, so that after the flow distribution component 4 is clamped between the collecting pipe 31 and the heat exchange plate 21, the throttling hole 41 can be opposite to the branch hole 312 and the heat exchange cavity 211, thereby enabling the throttling hole 41 to achieve effective throttling effect.

[0095] Reference Fig.13 The manifold 31 has a main flow cavity 311 and a plurality of branch holes 312 connected to the main flow cavity 311. The plurality of branch holes 312 are arranged opposite to the plurality of throttling holes 41. Each heat exchange cavity 211 is connected to at least one branch hole 312, so that the heat exchange medium in the manifold 31 can be diverted through the branch holes 312 to flow to the flow distribution component 4, and then evenly diverted to each heat exchange cavity 211 through the equalizing effect of the throttling holes 41, so as to achieve balanced heat exchange of the heat exchange plate 21.

[0096] According to some embodiments of the present invention, the flow distribution component 4 adjusts the flow by adjusting the number and / or position and / or aperture of the throttling holes 41. Therefore, different flow distribution components 4 need to be designed for multiple heat exchange plates 21 to meet the purpose of balanced flow distribution of multiple heat exchange plates 21, so that the flow of heat exchange medium in each heat exchange cavity 211 can be equal, so as to achieve a more balanced heat exchange effect.

[0097] Reference Fig.11 In order to achieve effective throttling effect of the throttling hole 41, the embodiment of the present invention sets the flow area of ​​the throttling hole 41 to be smaller than the flow area of ​​the open end of the heat exchange chamber 211, so as to achieve different throttling effects by changing the aperture size of the throttling hole 41.

[0098] Among them, the flow area of ​​the throttle holes 41 at the two ends of the flow distribution component 4 is larger than the flow area of ​​the throttle hole 41 in the middle. When the heat exchange medium flows through the same manifold 31, the liquid pressure is smaller at the position closer to the end of the manifold 31, and the flow rate of the heat exchange medium is smaller. On the contrary, the liquid pressure in the middle of the manifold 31 is the largest, and the coolant flow rate is the largest. Therefore, the flow area of ​​the throttle holes 41 at the two ends of the flow distribution component 4 is set to be larger than the flow area of ​​the throttle hole 41 in the middle, so as to achieve a reasonable throttling effect, and then after the throttling effect of different throttle holes 41 on the flow distribution component 4, the flow rate of the heat exchange medium in each heat exchange cavity 211 can be balanced, so as to effectively solve the performance and life problems of the battery module 400 caused by the uneven temperature of the heat exchange plate 21.

[0099] like Fig.11 and Fig.12As shown, the multiple groups of throttling holes 41 of the flow distribution component 4 include end throttling holes 411 arranged at both ends and a middle throttling hole 412 arranged in the middle, the end throttling holes 411 correspond to the heat exchange chambers 211 at both ends of the heat exchange plate 21, and the middle throttling holes 412 correspond to other heat exchange chambers 211 of the heat exchange plate 21, and the number of throttling holes 41 in each group of end throttling holes 411 is less than the number of throttling holes 41 in each group of middle throttling holes 412, so as to match the large flow area of ​​the end throttling holes 411 and the small flow area of ​​the middle throttling holes 412 mentioned above, so that the flow rate of the heat exchange medium input into the heat exchange chamber 211 by each throttling hole 41 can be equal, thereby achieving the purpose of balanced heat exchange of the heat exchange plate 21.

[0100] Combination Figure 8 and Fig.12 In the embodiment shown, at least one header 31 in the plurality of heat exchange plate 21 assemblies has a connection port 313 (water inlet end) for communicating with an external waterway, and the total flow area of ​​all throttle holes 41 in the flow distribution component 4 increases as the distance from the flow distribution component 4 to the connection port 313 increases ( Fig.12 The three groups of flow distribution components 4 are arranged away from the connection port 313 from top to bottom).

[0101] In other words, a header 31 in the plurality of heat exchange plate 21 assemblies has a connection port 313 for communicating with an external waterway, and the flow area of ​​the throttling holes 41 of the plurality of flow distribution components 4 is positively correlated with the distance from the flow distribution component 4 to the connection port 313 .

[0102] Since the hydraulic pressure of the heat exchange medium in the heat exchange system continuously decreases along the liquid flow direction of the heat exchange medium, the hydraulic pressure at the position close to the total inlet of the heat exchange system (connection port 313) is larger, and the flow rate of the heat exchange medium is also larger. Therefore, in order to adjust the consistency of the flow rates of each heat exchange plate 21, the flow area of ​​the throttling hole 41 on the flow distribution component 4 corresponding to the heat exchange plate 21 closer to the connection port 313 is minimized, and then along the flow direction of the heat exchange medium, the flow area of ​​the throttling hole 41 on the flow distribution component 4 corresponding to the downstream heat exchange plate 21 is successively larger than the flow area of ​​the throttling hole 41 on the flow distribution component 4 corresponding to the upstream heat exchange plate 21.

[0103] As a result, the uniformity of flow distribution of each heat exchange plate 21 in the heat exchange system of the battery pack is achieved, thereby effectively solving the system performance and life problems caused by the uneven temperature of each heat exchange plate 21.

[0104] In summary, the present invention effectively realizes the unification of the flow of each heat exchange plate 21 by adding a flow distribution component 4 between the heat exchange plate 21 and the manifold 31. Among them, each heat exchange plate 21 and the pipe joint 32 are completely consistent and can be used universally. It is only necessary to change the arrangement of the throttle hole 41 on the flow distribution component 4, which is conducive to material management and reduces the subsequent maintenance costs. It can effectively improve efficiency and reduce costs in various stages such as design, production, assembly, and after-sales.

[0105] like Fig.13 As shown, the heat exchange cavity is open at the end of the heat exchange plate, and a boss 212 extending outward is provided at the end of the heat exchange plate. The heat exchange cavity passes through the boss 212 to facilitate the communication between the heat exchange cavity and the throttling hole and the branch hole.

[0106] Furthermore, the flow distribution component is installed on the end face of the boss 212 to achieve the fit and alignment of the throttling hole and the heat exchange cavity. The collecting pipe has an outwardly protruding overlapping edge 314, which is connected to the side of the boss 212 to achieve a stable connection between the collecting pipe and the heat exchange plate.

[0107] 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 component, so that the overlapping edge 314 can be overlapped and fixed to the boss 212 while also being fixed to the side of the flow distribution component, and the flow distribution component can be more stably clamped between the boss 212 and the collecting pipe to avoid shaking of the flow distribution component and affecting the interconnection between the branch holes, throttling holes and the heat exchange chamber.

[0108] As a preferred embodiment, refer to Fig.13 The overlapping edges 314 include at least two overlapping edges 314 that are arranged opposite to each other. The two overlapping edges 314 are respectively connected to the 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 clamped and fixed between the two overlapping edges 314 more stably to achieve a stable connection between the collecting pipe and the heat exchange plate.

[0109] In addition, the step surface 72 between the boss 212 and the side of the heat exchange plate and the end of the lap edge 314 are provided with welding grooves for easy welding and fixing. Preferably, the lap edge 314 is connected to the heat exchange plate by laser welding. The use of laser welding can ensure that the weld will not interfere with other parts, and this welding structure has a wide range of applications, high welding strength, stable welding process, and a one-time qualified rate of products is much higher than other welding forms.

[0110] According to some embodiments of the present invention, Fig. 9As shown, the frames around the battery box 100, in addition to the side frames 1 with the cavity 11 on the left and right sides, also include a front frame, a front left frame, a rear frame, and a front right frame. The above frames are connected in sequence to form an integral frame.

[0111] Furthermore, the battery box 100 further includes: a box cross beam 5 and a box longitudinal beam 6, which are arranged vertically in the battery box 100, wherein both ends of the box cross beam 5 are welded to the side frame 1, and the bottom surface of the box cross beam 5 is welded to the support plate 22 to form strength support. Both ends of the box longitudinal beam 6 are welded to the side frame 1, and the bottom surface of the box longitudinal beam 6 is bonded to the upper surface of the bottom plate assembly 2 by adhesive to form strength support.

[0112] The floor assembly 2 further includes a front floor beam and a rear floor beam to further increase the overall strength of the battery box 100 .

[0113] According to some embodiments of the present invention, Fig. 20 and 21 As shown, the energy absorbing structure 15 is used to absorb the energy generated when the frame body collides, which can effectively protect the frame body, and then protect the collector 31 set inside the frame body, which can effectively improve the impact resistance of the battery pack.

[0114] Furthermore, the energy absorption structure 15 is of a hollow type and is located above and inside the cavity 11, so that it is easier to set up and has a better energy absorption effect, thereby effectively protecting the cavity 11 from damage caused by impact. It can also effectively reduce the weight of the frame body, thereby achieving the purpose of lightweighting the battery pack.

[0115] Specifically, 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, thereby making the stability of the energy absorbing structure 15 better and increasing the energy absorption.

[0116] Reference Fig. 20 and Fig.21 The side frame 1 also includes: a protective structure 16 for protecting the cavity 302 body 11 to prevent damage to the cavity 11 caused by external impact, which can effectively protect the cavity 11 and the collecting pipe 31 arranged in the cavity 11, thereby enabling the heat exchange system to operate safely and stably.

[0117] Furthermore, the protective structure 16 includes an upper protective section 161 and an outer protective section 162. The upper protective section 161 is located above the cavity to prevent damage to the cavity 11 caused by impact from above the frame body, while the outer protective section 162 is located outside the cavity to prevent damage to the cavity 11 caused by impact from outside the frame body. Thus, the protective structure 16 can protect the cavity 11 from above and outside the cavity 11, thereby improving the safety of the cavity 11 and the safety of the manifold 31 disposed therein.

[0118] Specifically, the upper protection section 161 and the outer protection section 162 are both of a cavity type. Therefore, it is easier to set up and has a better energy absorption effect. It can also effectively reduce the weight of the frame body, thereby achieving the purpose of lightweighting the battery pack.

[0119] like Fig. 20 and Fig.21 As shown, reinforcing ribs 17 are provided in the cavities of the upper protective segment 161 and the outer protective segment 162 to divide the cavities into multiple cavities. The reinforcing ribs 17 can strengthen the upper protective segment 161 and the outer protective segment 162 to a certain extent, so that the overall strength of the upper protective segment 161 and the outer protective segment 162 is greater, and dividing the large cavities of the upper protective segment 161 and the outer protective segment 162 into more small cavities can further enhance the protective effect and energy absorption effect of the upper protective segment 161 and the outer protective segment 162, so that the impact resistance of the frame body is better, so as to effectively protect the collecting tube 31 arranged therein, and protect the battery pack as a whole.

[0120] According to some embodiments of the present invention, Figure 1-Figure 4 As shown, the heat exchange plate 21 is suitable for being attached to the battery module 400 to achieve heat exchange, wherein a longitudinally penetrating heat exchange cavity 211 is provided in the heat exchange plate 21, and the heat exchange cavity 211 is suitable for circulating a heat exchange medium to achieve the heat exchange effect of the heat exchange plate 21.

[0121] Further, refer to Figure 1-Figure 4 , multiple heat exchange plates 21 and multiple support plates 22 are arranged alternately in the horizontal direction. Among them, the support plates 22 are used to support and fix the battery module 400, and two adjacent support plates 22 are fixedly connected to the same battery module 400, so that the battery module 400 can span the heat exchange plates 21 and can be arranged closely with the heat exchange plates 21 to achieve effective heat exchange.

[0122] Since the arrangement in the traditional battery pack is that the heat exchange plate 21 is fixed on the support plate 22, and the battery module 400 is arranged on the heat exchange plate 21, the battery pack is heavy and occupies a large space. Therefore, in the embodiment of the present invention, part of the support plate 22 is replaced by the heat exchange plate 21, so that the heat exchange plate 21 has both the function of heat exchange and the function of supporting the battery module 400, so as to realize one structure and two functions, which can make the overall structure of the battery pack more compact, effectively reduce the number of structures in the battery pack, and thus reduce the weight of the battery pack.

[0123] Combination Figure 5-Figure 7 In the embodiment shown, the heat exchange plate 21 and the support plate 22 are connected by plugging structure. Thus, the assembly of the heat exchange plate 21 and the support plate 22 can be made simpler and more convenient. The traditional welding process and the setting of separate fixing parts can be effectively avoided, thereby reducing the overall cost of the battery pack.

[0124] Moreover, the plug-in connection method makes it easier to ensure the flatness of the heat exchange plate 21 and the support plate 22 after they are connected, so that the support plate 22 and the heat exchange plate 21 can better fix and support the battery module 400, and can also ensure that the heat exchange plate 21 can be stably set close to the battery module 400 to ensure the heat exchange effect.

[0125] like Figure 5-Figure 7 As shown, the plug-in structure includes: a plug-in slot 7 and a plug-in boss 8. Optionally, the first one of the heat exchange plate 21 and the support plate 22 is provided with a plug-in slot 7, and the second one of the heat exchange plate 21 and the support plate 22 is provided with a plug-in boss 8, and the plug-in boss 8 is inserted into the plug-in slot 7. In other words, the heat exchange plate 21 may be provided with a plug-in slot 7, and the corresponding support plate 22 may be provided with a plug-in boss 8. Alternatively, the heat exchange plate 21 may be provided with a plug-in boss 8, and the corresponding support plate 22 may be provided with a plug-in slot 7. Both of the above forms can realize the plug-in cooperation between the heat exchange plate 21 and the support plate 22.

[0126] As a preferred embodiment, the end surface of the plug boss 8 is bonded to the bottom wall of the plug slot 7 by adhesive, thereby making the installation and fixing process simpler and avoiding the use of a separate fastener to fasten the two, thereby reducing the manufacturing cost.

[0127] Of course, the plug-in boss 8 can also be connected and fixed to the plug-in groove 7 by interference fit.

[0128] Further, if Figure 5 As shown, a guide surface 81 is provided between the end face of the plug-in boss 8 and the side face of the plug-in boss 8. The guide surface 81 plays a guiding role in the plug-in matching process between the two, so that the plug-in boss 8 can be installed into the plug-in slot 7 more conveniently and accurately to complete the connection and fixation between the two.

[0129] According to some embodiments of the present invention, referring to Figure 5 , the plug-in groove 7 is open in the horizontal direction, and the plug-in boss 8 protrudes in the horizontal direction. Specifically, the upper surface of the plug-in boss 8 is concave relative to the upper surface of the second one of the heat exchange plate 21 and the support plate 22, and the lower surface of the plug-in boss 8 is concave relative to the lower surface of the second one 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.

[0130] As a result, the plug-in installation process can be made more convenient, and the support plate 22 and the heat exchange plate 21 can be set relatively thinner to reduce the overall weight of the battery pack.

[0131] like Figure 5 As shown, the plug-in groove 7 is provided on the side of the first one of the heat exchange plate 21 and the support plate 22, and the plug-in boss 8 is provided on the side of the second one of the heat exchange plate 21 and the support plate 22. Since the heat exchange plate 21 and the support plate 22 are plugged and fixed in the horizontal direction, the plug-in groove 7 and / or the plug-in boss 8 are provided at both ends of the heat exchange plate 21 and / or the support plate 22 to facilitate the horizontal plug-in and make the overall structure of the two after plugging more compact.

[0132] According to other embodiments of the present invention, Figure 6 and Figure 7 The plug-in slot 7 is open in the vertical direction, and the plug-in boss 8 protrudes in the vertical direction. In other words, the support plate 22 and the heat exchange plate 21 are plugged and fixed in the vertical direction.

[0133] Further, the upper surface of the first (one of) the support plate 22 and the heat exchange plate 21 is provided with a sunken support surface 71, and the plug-in groove 7 is provided on the support surface 71. The second (the other) of the support plate 22 and the heat exchange plate 21 is provided with a side plate 82 extending in the horizontal direction, and the lower surface of the side plate 82 is provided with a plug-in boss 8 protruding downward, and the side plate 82 is supported on the support surface 71.

[0134] Thus, a stable support connection is achieved in both the horizontal and vertical directions. That is, the longitudinal plugging of the plug-in boss 8 and the plug-in groove 7 realizes the horizontal 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 of the heat exchange plate 21 and the support plate 22, thereby making the heat exchange plate 21 and the support plate 22 more stable.

[0135] According to some embodiments of the present invention, the upper surface of the first (one of) of the support plate 22 and the heat exchange plate 21 is connected to the support surface 71 via a stepped surface 72, the stepped surface 72 forms an obtuse angle with the support surface 71, and the upper surface of the side plate 82 forms an acute angle with the side surface of the side plate 82. Thus, the side surface of the side plate 82 and the stepped surface 72 are relatively parallel to each other, so as to facilitate the splicing of the two, so that the upper surfaces of the heat exchange plate 21 and the support plate 22 can be located in the same plane, so that the various parts of the battery module 400 supported on the heat exchange plate 21 and the support plate 22 can be subjected to more uniform force, thereby ensuring the installation stability of the battery module 400.

[0136] Furthermore, it can be ensured that the heat exchange plate 21 can be arranged in close contact with the battery module 400 at all locations to ensure the overall heat exchange effect.

[0137] like Figure 7 As shown, the stepped surface 72 is parallel to and spaced apart from the side of the side plate 82, and the side of the support plate 22 is also spaced apart from the side of the heat exchange plate 21. The above two intervals are designed margins to prevent assembly interference, thereby ensuring the assembly reliability and stability of the heat exchange plate 21 and the support plate 22.

[0138] Optionally, the plug slot 7 and the plug boss 8 are fixed by interference fit, or the plug slot 7 and the plug boss 8 are connected by cold pressure welding, or the plug slot 7 and the plug boss 8 are fixed by adhesive bonding. The above three fixing forms can be reasonably selected according to the specific setting of the heat exchange plate 21 and the support plate 22 in the battery pack to achieve a better fixing effect.

[0139] like Fig.10 As shown, a bottom guard plate 301 is provided under the bottom plate, and a protective cavity 302 is defined between the upper surface of the bottom guard plate 301 and the lower surface of the bottom plate, and a buffer filler is filled in the protective cavity 302. The bottom guard plate 301 plays a role in protecting the bottom plate to prevent the bottom plate from being damaged by the impact from the bottom of the battery pack, and the protective cavity 302 and the buffer filler provided therein have a certain energy absorption and buffering effect, which can further play a protective role.

[0140] Furthermore, the lower surface of the heat exchange plate 21 is provided with a first support leg 213, which is supported between the heat exchange plate 21 and the bottom guard plate 301 and is connected and fixed to the bottom guard plate 301 to play a supporting and reinforcing role, so that the bottom guard plate 301 and the floor are connected as a whole, thereby making the overall strength of the battery pack greater. Among them, the first support leg 213 and the heat exchange cavity 211 are staggered to avoid the first support leg 213 being compressed into the heat exchange cavity 211 when the lower part of the battery pack is impacted, so as to effectively protect the heat exchange cavity 211.

[0141] Furthermore, the support plate 22 is provided with a weight-reducing cavity 221 and a second leg 222. The weight-reducing cavity 221 can effectively reduce the weight of the support plate 22. The second leg 222 is connected to the lower surface of the support plate 22. The second leg 222 is supported between the support plate 22 and the bottom guard plate 301 and is connected and fixed to the bottom guard plate 301 to play a supporting and reinforcing role, so that the bottom guard plate 301 and the floor are connected as a whole, thereby making the overall strength of the battery pack greater. Among them, the second leg 222 and the weight-reducing cavity 221 are staggered to avoid the impact of the lower part of the battery pack causing the second leg 222 to be compressed into the weight-reducing cavity 221, so as to effectively protect the weight-reducing cavity 221.

[0142] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0143] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A battery box (100), characterized in that: include: A side frame (1), a bottom plate assembly (2) and a collecting pipeline (3), wherein the side frame (1) defines a cavity (11) having an opening, the bottom plate assembly (2) closes the opening of the cavity (11), the bottom plate assembly (2) comprises a heat exchange plate (21), the heat exchange plate (21) has a heat exchange cavity (211) for circulating a heat exchange medium, the collecting pipeline (3) is arranged in the cavity (11) and is in communication with the heat exchange cavity (211); an end of the heat exchange plate (21) is provided with a boss (212) extending outwards, the heat exchange cavity (211) passes through the boss (212), the collecting pipeline (3) comprises a collecting pipe (31) and a pipe joint (32), the collecting pipe (31) is arranged at the end of the heat exchange plate (21) and is in communication with the heat exchange cavity (211); The heat exchange chamber (211) is connected to the heat exchange chamber (211), the collecting pipe (31) is provided with an outwardly protruding overlapping edge (314), the overlapping edge (314) is connected to the side of the boss (212), and the pipe joint (32) connects two adjacent collecting pipes (31); and further comprises: a flow distribution component (4), the flow distribution component (4) is sandwiched between the heat exchange plate (21) and the collecting pipe (31), and the flow distribution component (4) is installed on the end surface of the boss (212); 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 component (4), the flow distribution component (4) has a plurality of groups of throttling holes (41), and the collecting pipe (31) is connected to the heat exchange chamber (211) through the throttling holes (41).

2. The battery box (100) according to claim 1, characterized in that: The side frame (1) comprises a first end arm (12), a second end arm (13) and an isolation segment (14); the isolation segment (14) is connected between the first end arm (12) and the second end arm (13); and the first end arm (12), the second end arm (13) and the isolation segment (14) define the cavity (11).

3. The battery box (100) according to claim 2, characterized in that: The bottom plate assembly (2) comprises heat exchange plates (21) and support plates (22) arranged in a staggered manner, and the first end arm (12) of the side frame (1) is connected to the upper surfaces of the heat exchange plates (21) and the support plates (22).

4. The battery box (100) according to claim 3, characterized in that: The end of the support plate (22) is connected to the second end arm (13) of the side frame (1) to close the opening of the cavity (11) at a corresponding position.

5. The battery box (100) according to claim 3, characterized in that: The bottom plate assembly (2) further comprises a patch plate (23), wherein the patch plate (23) is connected to 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 a corresponding position.

6. The battery box (100) according to claim 5, characterized in that: The patch plate (23) has a first end and a second end that are arranged opposite to each other, and a third end and a fourth end that are arranged opposite to each other; the first end of the patch plate (23) is connected to the second end arm (13) of the side frame (1), and the second end of the patch plate (23) is connected to the end of the heat exchange plate (21); at least one of the third end and the fourth end of the patch plate (23) is connected to the adjacent support plate (22).

7. The battery box (100) according to claim 1, characterized in that: The heat exchange chambers (211) of the plurality of heat exchange plates (21) are connected in parallel via the header (31) and a pipe joint (32) connecting two adjacent headers (31), and heat exchange medium flows in the plurality of heat exchange chambers (211) inside the plurality of heat exchange plates (21) in the same direction from one end of the plurality of heat exchange plates (21) to the other end.

8. The battery box (100) according to claim 1, characterized in that: The header (31) comprises a main flow cavity (311) and a plurality of branch holes (312) in communication with the main flow cavity (311); the branch holes (312) are arranged corresponding to the throttling holes (41); and the plurality of heat exchange cavities (211) of the heat exchange plate (21) are connected in parallel via the header (31).

9. The battery box (100) according to claim 1, characterized in that: The flow distribution component (4) adjusts the flow rate by adjusting the number and / or position and / or aperture of the throttling holes (41).

10. The battery box (100) according to claim 1, characterized in that: The flow area of ​​the throttling hole (41) is smaller than the flow area of ​​the open end of the heat exchange chamber (211), and the flow area of ​​the throttling holes (41) at both ends of the flow distribution component (4) is larger than the flow area of ​​the throttling hole (41) in the middle.

11. The battery box (100) according to claim 1, characterized in that: At least one of the plurality of manifolds (31) has a connection port (313) for communicating with an external waterway, and the total flow area of ​​all throttling holes (41) in the flow distribution component (4) increases as the distance from the flow distribution component (4) to the connection port (313) increases.

12. The battery box (100) according to any one of claims 3 to 6, characterized in that: It is characterized by further comprising: A box crossbeam (5), wherein both ends of the box crossbeam (5) are connected to the side frames (1) by welding, and the bottom surface of the box crossbeam (5) is connected to the support plate (22) by welding; A box longitudinal beam (6), wherein both ends of the box longitudinal beam (6) are connected to the side frame (1) by welding, and the bottom surface of the box longitudinal beam (6) is bonded to the upper surface of the bottom plate assembly (2) by adhesive.

13. The battery box (100) according to any one of claims 1 to 11, characterized in that: The side frame (1) further comprises an energy absorbing structure (15) for absorbing energy generated during a collision; the side frame (1) further comprises a protective structure (16) for protecting the cavity (11).

14. The battery case (100) according to claim 13, characterized in that: The energy absorbing structure (15) and / or the protective structure (16) are of a cavity type.

15. The battery case (100) according to claim 14, characterized in that: Reinforcing ribs (17) are provided in each of the cavities to divide the cavity into multiple parts.

16. The battery box (100) according to any one of claims 1-11, characterized in that: The bottom plate assembly (2) comprises heat exchange plates (21) and support plates (22) arranged in a staggered manner, and the heat exchange plates (21) and the support plates (22) are plug-connected via a plug-in structure.

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