Battery pack lower box and battery pack

Abstract

The present disclosure relates to a battery pack lower box and a battery pack, the battery pack lower box comprising a ring-shaped enclosure (1) and a bottom plate (2), the enclosure (1) being connected to the bottom plate (2) to form a cavity for accommodating a battery module; a medium circulation pipeline (3) is arranged in the cavity, the medium circulation pipeline (3) having a medium inlet (4) and a medium outlet (5), the medium inlet (4) and the medium outlet (5) being arranged on the outside of the enclosure (1), the medium circulation pipeline (3) being bent and extended in a plane parallel to the bottom plate (2), and the ratio of the pipe height to the pipe diameter of the medium circulation pipeline (3) being 1:(1.2-6). The battery pack of the present disclosure can achieve better heat management effect and sealing effect, improve the space utilization and the battery energy density, and reduce the cost.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of batteries, in particular to a battery pack lower box and a battery pack. BACKGROUND

[0002] At present, countries around the world are actively developing electric vehicles. The safety, endurance and charging efficiency of the battery system of an electric vehicle, as one of the three core technologies of an electric vehicle, will directly affect the overall performance and driving safety of the electric vehicle.

[0003] The high-rate charge-discharge performance of a power battery gradually becomes one of the key factors for obtaining the recognition and selection of a vehicle enterprise, and the temperature has a great influence on the charge-discharge performance of the battery. Therefore, it is crucial to design a reasonable thermal management system to make the power battery work at a suitable temperature for its performance and service life, and it also plays a very important role in the safety performance of the battery cell. The heating and cooling functions of the existing thermal management system of the power battery of an electric vehicle are generally realized by two independent devices, i.e., heat dissipation by using a heat-conducting sticker or a water (air) cooling system, and heating by using a PTC heating component or a PI heating film attached to the outside of the battery. The above-mentioned method has the problems of a large number of devices and materials involved, occupation of the internal space of the battery pack, reduction of the battery energy density, increase of the cost of the battery pack, and low heating and cooling efficiency and high failure risk. SUMMARY

[0004] The purpose of the present disclosure is to provide a battery pack lower box and a battery pack, which can save the internal space of the battery pack, improve the space utilization rate, and have good cooling and heat preservation performance.

[0005] In order to achieve the above-mentioned purpose, the first aspect of the present disclosure provides a battery pack lower box, which comprises a ring-shaped enclosing frame and a bottom plate, the enclosing frame is connected to the bottom plate to form a cavity for accommodating a battery module;

[0006] A medium circulation pipeline is arranged in the cavity, the medium circulation pipeline has a medium inlet and a medium outlet, the medium inlet and the medium outlet are arranged on the outer side of the enclosing frame, the medium circulation pipeline is bent and extended in a plane parallel to the bottom plate, and the ratio of the pipe height to the pipe diameter of the medium circulation pipeline is 1:(1.2-6).

[0007] Optionally, the medium circulation pipeline is bent and extended in an S shape at least in part to form a plurality of parallel pipeline segments, and the plurality of pipeline segments are uniformly and spacedly arranged above the bottom plate.

[0008] Optionally, the medium circulation pipeline is integrally formed.

[0009] Optionally, the medium inlet and the medium outlet are located on the same side of the enclosing frame.

[0010] Optionally, the frame is formed with a gap, and an adapter is sealingly connected to the frame at the gap, two pipe installation holes are formed in the adapter, and the medium inlet and the medium outlet are sealingly installed in one of the pipe installation holes, respectively.

[0011] Optionally, a sensor hole is further formed in the adapter, the sensor hole is in communication with the pipe installation hole, and a temperature sensor is sealingly installed in the sensor hole.

[0012] Optionally, the medium circulation pipe is bonded to the bottom plate through a first adhesive layer, and the first adhesive layer has the same shape as a cross-sectional shape of the medium circulation pipe.

[0013] Optionally, the first adhesive layer is made of structural adhesive.

[0014] Optionally, a uniform temperature plate is arranged above the medium circulation pipe, and the uniform temperature plate is fixedly connected to the frame.

[0015] Optionally, the medium circulation pipe is bonded to the uniform temperature plate through a second adhesive layer, and the second adhesive layer has the same shape as a cross-sectional shape of the medium circulation pipe.

[0016] Optionally, the second adhesive layer is made of heat-conducting adhesive.

[0017] Optionally, a third adhesive layer is arranged above the uniform temperature plate.

[0018] Optionally, the third adhesive layer is made of heat-conducting adhesive.

[0019] Optionally, a plurality of first supporting blocks are arranged at a bottom of the uniform temperature plate, for supporting the uniform temperature plate and spacing the uniform temperature plate from the bottom plate, and the plurality of first supporting blocks are arranged in gaps formed by the medium circulation pipe being bent and extended.

[0020] Optionally, the plurality of first supporting blocks are arranged along a center line of the uniform temperature plate, and / or the plurality of first supporting blocks are arranged in axial symmetry with respect to the center line of the uniform temperature plate.

[0021] Optionally, a plurality of limiting holes are formed in the bottom plate and match the first supporting blocks.

[0022] Optionally, the frame comprises a first side plate, a first end plate, a second side plate and a second end plate which are sequentially and end-to-end connected, a first mounting beam and a second mounting beam are arranged between the first side plate and the second side plate, the first mounting beam and the second mounting beam are parallel to the first end plate, respectively, the first mounting beam and the second mounting beam are connected to the uniform temperature plate, the first mounting beam is connected to the first end plate, and the second mounting beam is located on a center line of the uniform temperature plate.

[0023] Optionally, the medium inlet and the medium outlet are arranged outside the first end plate.

[0024] Optionally, protrusions are arranged on the first mounting beam and the second mounting beam respectively, and fixing holes are arranged on the protrusions.

[0025] Optionally, the first mounting beam and the second mounting beam are hollow structures.

[0026] Optionally, a third mounting beam is arranged between the first mounting beam and the second mounting beam, and a fourth mounting beam is arranged between the second mounting beam and the second end plate, the third mounting beam and the fourth mounting beam are parallel to the first side plate, and the third mounting beam and the fourth mounting beam are connected to the uniform temperature plate.

[0027] Optionally, the third mounting beam and the fourth mounting beam are arranged on the center line of the uniform temperature plate.

[0028] Optionally, second support blocks are arranged on the first side plate and the second side plate respectively, and a third support block is arranged on the third mounting beam or the fourth mounting beam, the vertical heights of the second support blocks and the third support block are the same, and the second support blocks and the third support block are on a straight line.

[0029] Optionally, fixing holes are arranged on the second support blocks and the third support block respectively.

[0030] The second aspect of the present disclosure provides a battery pack, comprising a cover plate and the lower box body of the battery pack of the first aspect of the present disclosure, and the cover plate is arranged on the surrounding frame.

[0031] Optionally, the cover plate is fixedly connected with the surrounding frame, and an annular press fitting member is arranged on the cover plate, and the press fitting member is matched with the shape of the surrounding frame.

[0032] Optionally, the edge of the cover plate extends downward to form a first lower edge portion, the first lower edge portion extends outward horizontally to form a second lower edge portion, the press fitting member is formed with a connected flat plate and a vertical plate, the vertical plate is in contact with the first lower edge portion, and the flat plate is in contact with the second lower edge portion.

[0033] Optionally, the press fitting member comprises an angle piece and an edge piece, the angle piece is arranged at the corner of the cover plate, and the edge piece is arranged at the edge of the cover plate.

[0034] Optionally, fixing holes are arranged on the edge of the cover plate, the press fitting member and the surrounding frame respectively, and the press fitting member, the cover plate and the surrounding frame are riveted through a fixing member.

[0035] The battery pack of the present disclosure is convenient to install and maintain, and has good processability.

[0036] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0037] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following specific embodiments to explain the present disclosure but do not constitute a limitation on the present disclosure. In the drawings:

[0038] Figure 1 is an assembly view of the battery pack of an embodiment;

[0039] Figure 2 is Figure 1 an exploded view of the battery pack of

[0040] Figure 3 is a structural schematic view of the lower box of the battery pack of an embodiment;

[0041] Figure 4 is Figure 3 an exploded view of the lower box of the battery pack of

[0042] Figure 5 is Figure 3 a structural schematic view of the frame body in the lower box of the battery pack of

[0043] Figure 6 is a structural schematic view of the medium circulation pipeline of an embodiment;

[0044] Figure 7 is Figure 6 an exploded view of the medium circulation pipeline of

[0045] Figure 8 is Figure 2 a structural schematic view of the cover plate and the press-fit piece in the battery pack of

[0046] Figure 9 is Figure 8 an enlarged schematic view of part A in

[0047] Figure 10 is a structural exploded view of the press-fit piece of an embodiment;

[0048] Figure 11is a longitudinal sectional view of a medium circulation pipeline of several embodiments.

[0049] Reference Signs List

[0050] 1 frame 2 bottom plate

[0051] 3 medium circulation pipeline 4 medium inlet

[0052] 5 medium outlet 6 adapter

[0053] 7 temperature sensor 8 first adhesive layer

[0054] 9 uniform temperature plate 10 second adhesive layer

[0055] 11 third adhesive layer 12 first support block

[0056] 13 first side plate 14 first end plate

[0057] 15 second side plate 16 second end plate

[0058] 17 first mounting beam 18 second mounting beam

[0059] 19 protrusion 20 third mounting beam

[0060] 21 fourth mounting beam 22 second support block

[0061] 23 third support block 24 cover plate

[0062] 25 press-fitting 26 first lower edge

[0063] 27 second lower edge 28 flat plate

[0064] 29 vertical plate 30 corner piece

[0065] 31 edge piece 32 pipeline segment

[0066] 33 lug 34 mounting bracket

[0067] 35 screw 36 sealing ring

[0068] 37 battery module 38 high-voltage electrical mounting port

[0069] 39 inlet joint 40 outlet joint DETAILED DESCRIPTION

[0070] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended for illustration and explanation of the present disclosure and are not intended to limit the present disclosure.

[0071] In the present disclosure, the orientation words such as "upper" and "lower" generally refer to the upper and lower positions of the device in the actual use or working state, and specifically refer to the directions of the drawing surface in the drawings, and the "inner" and "outer" refer to the outline of the device.

[0072] The present disclosure provides a battery pack lower box and a battery pack comprising the same, referring to Figures 1 to 11 . Wherein the battery pack comprises a cover plate 24 and a battery pack lower box, the battery pack lower box comprises an annular frame 1 and a bottom plate 2, and the cover plate 24 is arranged on the frame 1.

[0073] The frame 1 is connected to the bottom plate 2 to form a cavity for accommodating the battery module 37. The cavity is provided with a medium circulation pipeline 3. In the working state, circulating medium is input into the medium circulation pipeline 3, which circulates in the medium circulation pipeline 3, effectively taking away the heat of the battery module when the temperature of the battery module is too high, and also playing a role of isolating low temperature when the external temperature is relatively low. The circulating medium can be a medium capable of achieving the above purpose, such as water, which has a high specific heat and can better achieve the cooling and heat preservation of the battery module.

[0074] The medium circulation pipeline 3 is bent and extends in a plane parallel to the bottom plate 2, which is beneficial to fully improve the utilization rate of the pipeline. The ratio of the height of the medium circulation pipeline 3 to the diameter of the medium circulation pipeline 3 is 1:(1.2-6), and is further preferably 1:(2-4). Wherein the height of the medium circulation pipeline 3 and the diameter of the medium circulation pipeline 3 refer to the dimensions of the medium circulation pipeline 3 in the longitudinal section, referring to Figure 11 , the height of the medium circulation pipeline 3 refers to the maximum longitudinal distance a of the longitudinal section of the medium circulation pipeline 3, and the diameter of the medium circulation pipeline 3 refers to the maximum transverse distance b of the longitudinal section of the medium circulation pipeline 3. The shape of the medium circulation pipeline 3 is not limited, as long as the height of the medium circulation pipeline 3 and the diameter of the medium circulation pipeline 3 satisfy the above ratio, for example, the longitudinal section of the medium circulation pipeline 3 can be rectangular, rounded rectangular, oval, waist-shaped, inverted triangular or inverted trapezoidal (as shown in Figure 11 The present disclosure sets the bent and extended medium circulation pipeline 3 in the battery pack, and sets a special ratio of the height of the medium circulation pipeline 3 to the diameter of the medium circulation pipeline 3, which can maximize the heat conduction effect of the circulating medium, achieve better cooling or heat preservation effect, significantly reduce the space occupation ratio of the medium circulation pipeline 3 in height, save the internal space of the battery pack, improve the space utilization rate and the battery energy density, and reduce the cost.

[0075] The medium circulation pipeline 3 can adopt any bending mode, which can be linear bending or curve bending. The extension area of the medium circulation pipeline 3 can cover the entire bottom plate 2, or at least cover the area where the battery module is assembled, so as to achieve better heat conduction and heat preservation effect. In one embodiment, referring to Figure 6 and Figure 7The medium circulation pipeline 3 extends at least partially in a (straight) S-shaped bending manner to form a plurality of parallel pipeline segments 32 which are uniformly and spacedly arranged above the bottom plate 2. In this way, the heat conduction and heat preservation effects are good, the pipeline is easy to process, and the material is saved. In other embodiments, the medium circulation pipeline 3 can also extend in a Z-shaped, spiral-shaped or other form.

[0076] The medium circulation pipeline 3 has a medium inlet 4 and a medium outlet 5, which are arranged on the outside of the frame 1. Further, the medium circulation pipeline 3 is integrally formed, that is, the medium circulation pipeline 3 inside the frame 1 has no interface or joint, which can prevent liquid leakage in the battery pack from affecting the battery module. Further, the medium inlet 4 and the medium outlet 5 are located on the same side of the frame 1, which is convenient for connecting with the external interface.

[0077] The frame 1 can be formed with a gap, and the gap is provided with an adapter 6 which is sealingly connected with the frame 1. The adapter 6 is provided with two pipeline mounting holes, and the medium inlet 4 and the medium outlet 5 are sealingly mounted in one of the pipeline mounting holes. Through the adapter 6, the medium inlet 4 is connected with an inlet joint 39, and the medium outlet 5 is connected with an outlet joint 40. The inlet joint 39 and the outlet joint 40 are arranged on the outside of the frame 1 and are used for connecting and leading out the circulating medium. Further, the adapter 6 can also be provided with a sensor hole which is in communication with the pipeline mounting hole. A temperature sensor 7 is sealingly mounted in the sensor hole, and a temperature sensing probe of the temperature sensor 7 is in contact with the circulating medium. The temperature sensor 7 can be used to monitor the temperature of the circulating medium in real time and send a temperature signal to the battery management system. When the temperature is too high or too low, an alarm signal can also be sent. The shape of the sensor hole can be designed according to the shape of the temperature sensor 7, and the preferred shape is a circular hole. The temperature sensor 7 can be mounted in the sensor hole by adhesive, or the inner wall of the sensor hole can be designed as a threaded hole, and the temperature sensor 7 is screwed into the threaded hole to achieve better sealing.

[0078] The materials of the medium circulation pipeline 3, the adapter 6, the inlet joint 39 and the outlet joint 40 can all be aluminum to reduce the total weight of the battery pack. Further, the medium circulation pipeline 3 can be made of Al3003 material, and the adapter 6, the inlet joint 39 and the outlet joint 40 can be made of Al6063 material. During preparation, the inlet joint 39 and the outlet joint 40 can be welded to the adapter 6 by argon arc welding, and the medium inlet 4 and the medium outlet 5 of the medium circulation pipeline 3 can be welded to the adapter 6 by brazing.

[0079] The medium circulation pipeline 3 can be bonded to the bottom plate 2 by a first adhesive layer 8, and the shape of the first adhesive layer 8 is the same as the cross-sectional shape of the medium circulation pipeline 3. Further, the material of the first adhesive layer 8 can be structural adhesive.

[0080] To further enhance the thermal management effect of the battery pack, a uniform temperature plate 9 can be arranged above the medium circulation pipeline 3, and the uniform temperature plate 9 is fixedly connected with the surrounding frame 1. The uniform temperature plate 9 is close to the battery module 37, and is used to promote the heat balance between the battery module 37 and the medium circulation pipeline 3, so as to avoid that the temperature change greatly affects the battery performance. The material of the uniform temperature plate 9 can be aluminum, for example, Al6061. The medium circulation pipeline 3 can be bonded with the uniform temperature plate 9 through a second adhesive layer 10, and the shape of the second adhesive layer 10 is the same as the cross-sectional shape of the medium circulation pipeline 3. Further, the material of the second adhesive layer 10 can be thermal conductive glue, so that the heat of the uniform temperature plate 9 can be effectively transmitted to the medium circulation pipeline 3.

[0081] A third adhesive layer 11 can also be arranged above the uniform temperature plate 9. The third adhesive layer 11 can transmit the heat of the battery module 37 to the uniform temperature plate 9, and also has the effect of bonding the battery module 37. The arrangement area of the third adhesive layer 11 can be consistent with the size of the bottom of the battery module 37. Further, the material of the third adhesive layer 11 can be thermal conductive glue.

[0082] The shape of the uniform temperature plate 9 can be designed to be the same as the shape of the bottom surface of the battery module 37, which is generally rectangular. The number of the uniform temperature plate 9 can be adjusted as needed, and the uniform temperature plate 9 can be a whole plate or a plurality of small plates spliced together. The bottom of the uniform temperature plate 9 can be provided with a plurality of first supporting blocks 12 for supporting the uniform temperature plate 9 and spacing the uniform temperature plate 9 from the bottom plate 2, so as to provide sufficient height space for installing the medium circulation pipeline 3, avoid the uniform temperature plate 9 directly pressing on the medium circulation pipeline 3, and ensure the safety of the medium circulation pipeline 3. The plurality of first supporting blocks 12 are arranged in the gaps formed by the bending extension of the medium circulation pipeline 3, that is, between adjacent pipeline sections 32. Further, the plurality of first supporting blocks 12 can be arranged along the center line of the uniform temperature plate 9, wherein the center line of the uniform temperature plate 9 can include a plurality of straight lines passing through the center point of the uniform temperature plate 9; in addition, the plurality of first supporting blocks 12 can also be arranged symmetrically about the center line of the uniform temperature plate 9, so as to effectively support.

[0083] In an embodiment, a limiting hole matched with the first supporting block 12 can be formed in the bottom plate 2. When assembling the battery pack, the first supporting block 12 is inserted into the corresponding limiting hole, and then the uniform temperature plate 9 is fixedly connected with the bottom plate 2 through welding, so as to strengthen the overall strength and avoid abnormal noise during vibration of the uniform temperature plate 9. In other embodiments, the limiting hole can not be formed in the bottom plate 2, and the first supporting block 12 can be directly welded from the outside (bottom) of the bottom plate 2.

[0084] The enclosure 1 can include a first side plate 13, a first end plate 14, a second side plate 15 and a second end plate 16 connected in sequence. The end of the adjacent side plate and end plate can be designed as a cutting surface at an angle of 45° with the respective extension direction, and the two are matched with each other and are matched with each other by friction stir welding, forming a rectangular enclosure 1. The first side plate 13, the first end plate 14, the second side plate 15 and the second end plate 16 can be connected by triangular staggered ribs, and are respectively manufactured by aluminum extrusion molding process, which reduces weight and saves materials under the premise of ensuring mechanical strength and rigidity. The first side plate 13, the first end plate 14, the second side plate 15 and the second end plate 16 can be welded by friction stir welding to form the enclosure 1. The medium inlet 4 and the medium outlet 5 can be arranged on the outside of the first end plate 14.

[0085] Further, the first side plate 13 and the second side plate 15 can be provided with a first mounting beam 17 and a second mounting beam 18, respectively parallel to the first end plate 14, and the first mounting beam 17 and the second mounting beam 18 are connected to the uniform plate 9. The first mounting beam 17 is connected to the first end plate 14, and the second mounting beam 18 is located on the center line of the uniform plate 9. The first mounting beam 17 and the second mounting beam 18 can also be provided with a third mounting beam 20, and the second mounting beam 18 and the second end plate 16 are provided with a fourth mounting beam 21, respectively parallel to the first side plate 13, and the third mounting beam 20 and the fourth mounting beam 21 are also connected to the uniform plate 9. Further, the third mounting beam 20 and the fourth mounting beam 21 can be arranged on the center line of the uniform plate 9. In addition, the fifth mounting beam can also be arranged on the second end plate 16, and the fifth mounting beam can be integrally formed on the second end plate 16. The first mounting beam 17, the second mounting beam 18 and the fifth mounting beam can be respectively provided with a protruding portion 19, and the protruding portion 19 is provided with a fixing hole for connecting with the fixing bolt of the battery module 37, realizing the installation and fixation of the battery module 37 and strengthening the mechanical strength of the lower box body of the battery pack; the number of the protruding portion 19 can be multiple, and the multiple protruding portions 19 on one mounting beam are uniformly distributed. The first mounting beam 17, the second mounting beam 18 and the fifth mounting beam can be hollow structures, which reduces the total weight of the battery pack. By arranging the first mounting beam 17, the second mounting beam 18, the third mounting beam 20, the fourth mounting beam 21 and the fifth mounting beam, the battery module 37 can be stably installed in the battery pack, the mechanical strength of the lower box body of the battery pack and the flatness of the uniform plate 9 are strengthened, and abnormal sound is avoided during vibration.

[0086] The first mounting beam 17 can be welded on the inner side of the first end plate 14 by friction stir welding, and the two ends of the second mounting beam 18 can be welded with the first side plate 13 and the second side plate 15 respectively by friction stir welding. The first mounting beam 17, the second mounting beam 18 and the fifth mounting beam on the second end plate 16 can be welded on the uniform temperature plate 9 by friction stir welding. The two ends of the third mounting beam 20 can be welded with the first mounting beam 17 and the second mounting beam 18 respectively by argon arc welding, and the two ends of the fourth mounting beam 21 can be welded with the second mounting beam 18 and the second end plate 16 respectively by argon arc welding. The bottom of the third mounting beam 20 and the fourth mounting beam 21 is welded on the uniform temperature plate 9 by argon arc welding. The materials of the first mounting beam 17, the second mounting beam 18, the third mounting beam 20, the fourth mounting beam 21 and the fifth mounting beam can be aluminum materials, such as Al6061, to reduce the total weight of the battery pack.

[0087] A battery management system is generally also needed to be arranged in the battery pack to monitor the use state of the battery and protect the safe use of the battery. In order to stably install the battery management system, the first side plate 13 and the second side plate 15 can be respectively provided with a second support block 22, and the third mounting beam 20 or the fourth mounting beam 21 can be provided with a third support block 23. The upper surfaces of the second support block 22 and the third support block 23 are on the same plane, that is, the vertical heights of the second support block 22 and the third support block 23 are the same, and the second support block 22 and the third support block 23 are on a straight line, forming an installation support assembly of the battery management system. Further, the second support block 22 and the third support block 23 can be respectively provided with fixing holes for connecting with fixing bolts of the battery management system. The second support block 22 and the third support block 23 can be respectively welded and fixed on the first side plate 13, the second side plate 15, the third mounting beam 20 or the fourth mounting beam 21 by argon arc welding.

[0088] In addition to the above-mentioned components, the surrounding frame 1 can also be provided with other components for realizing installation and the like. For example, 2 lifting lugs 33 can be arranged on the outer side of the first end plate 14 for installing the battery pack in an external device, and a high-voltage electrical installation port 38 can also be arranged on the first end plate 14, and the like. These components can be designed as needed, and will not be described here. The surrounding frame 1 can be welded with the bottom plate 2 by friction stir welding.

[0089] The cover plate 24 is fixedly connected with the surrounding frame 1. In order to improve the connection stability, the cover plate 24 can be provided with an annular press-fit member 25, as shown in Figures 8 to 10The pressing part 25 is matched with the shape of the frame 1, and provides a downward pressure at the connecting position to make the cover plate 24 and the lower box body of the battery pack more balanced. The cover plate 24 can be riveted with the frame 1, and the edges of the cover plate 24, the pressing part 25 and the frame 1 are respectively provided with fixing holes for riveting the pressing part 25, the cover plate 24 and the frame 1 by a fixing part.

[0090] In an embodiment, the edges of the cover plate 24 extend downward to form a first lower edge part 26, and the first lower edge part 26 extends horizontally outward to form a second lower edge part 27, that is, the edges of the cover plate 24 form an "L" shape. Correspondingly, the pressing part 25 is formed with a flat plate 28 and a vertical plate 29 connected to each other, that is, also an "L" shape. When assembled, the vertical plate 29 is in contact with the first lower edge part 26, and the flat plate 28 is in contact with the second lower edge part 27, which is conducive to further improving the strength of the pressing part 25 and the connection stability of the cover plate 24 and the frame 1.

[0091] In an embodiment, the pressing part 25 can include corner parts 30 and edge parts 31. The corner parts 30 are formed in a right angle shape and arranged at the four corners of the cover plate 24, and the edge parts 31 are formed in a long strip shape and arranged at the edges of the cover plate 24. The edges of adjacent corner parts 30 and edge parts 31 are matched. The advantage of such arrangement is that the pressing part 25 is easier to process and more convenient to install. When the pressing part 25 needs to be provided with fixing holes, the edges of the corner parts 30 and the edge parts 31 can be respectively provided with installation hole notches, that is, the corner parts 30 and the edge parts 31 are fixed by a fixing part at the connecting position. In other embodiments, the pressing part 25 can also be integrally formed.

[0092] A sealing ring 36 can be arranged between the cover plate 24 and the frame 1 to achieve good sealing effect. When the connection mode is riveting, the sealing ring 36 is correspondingly provided with fixing holes.

[0093] The battery pack of the present disclosure integrates the medium circulation pipeline 3 with the lower box body of the battery pack. The medium circulation pipeline 3 has a special pipe height and pipe diameter ratio, which can effectively save the internal space of the battery pack, improve the energy density, and reduce the cost. The medium circulation pipeline 3 extends in the lower box body, fully improves the utilization rate of the pipeline, has high heat dissipation and heating efficiency, reduces the risk of leakage of circulating medium, and has high reliability. In addition, the battery pack of the present disclosure also has the advantages of convenient installation and maintenance, light weight, good processability and the like.

[0094] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0095] It should also be noted that various technical features described in the above detailed description are capable of being combined in any suitable manner unless otherwise explicitly stated. To avoid unnecessary repetition, various possible combinations of features are not all explicitly described in the present disclosure.

[0096] Furthermore, various embodiments of the present disclosure can be combined in any suitable manner, as long as it does not contradict the idea of the present disclosure, and it should be considered as disclosed in the present disclosure.

Claims

1. A battery pack lower case characterized by comprising: The application relates to a battery module cooling device, which comprises a ring-shaped frame (1) and a bottom plate (2), the frame (1) is connected to the bottom plate (2) to form a cavity for accommodating a battery module; A medium circulation pipeline (3) is arranged in the cavity, the medium circulation pipeline (3) has a medium inlet (4) and a medium outlet (5), the medium inlet (4) and the medium outlet (5) are arranged on the outside of the frame (1), the medium circulation pipeline (3) is bent and extends in a plane parallel to the bottom plate (2), the ratio of the height of the medium circulation pipeline (3) to the diameter of the medium circulation pipeline (3) is 1:(1.2-6); A uniform temperature plate (9) is arranged above the medium circulation pipeline (3), and the uniform temperature plate (9) is fixedly connected with the frame (1); A plurality of first supporting blocks (12) are arranged at the bottom of the uniform temperature plate (9) and are used for supporting the uniform temperature plate (9) and spacing the uniform temperature plate (9) from the bottom plate (2), the spacing is used for accommodating the medium circulation pipeline (3), and the plurality of first supporting blocks (12) are arranged in the gaps formed by the bending and extending of the medium circulation pipeline (3); Limiting holes matched with the first supporting blocks (12) are formed in the bottom plate (2).

2. The battery pack lower case according to claim 1, characterized by, The medium circulation pipeline (3) is at least partially bent and extends in an S shape to form a plurality of parallel pipeline sections (32), and the plurality of pipeline sections (32) are uniformly and spacedly arranged above the bottom plate (2).

3. The battery pack lower case according to claim 1, characterized by, The medium circulation pipeline (3) is integrally formed.

4. The battery pack lower case of claim 1, wherein, The frame (1) is formed with a gap, an adapter (6) is arranged at the gap and is sealingly connected with the frame (1), two pipeline mounting holes are formed in the adapter (6), and the medium inlet (4) and the medium outlet (5) are sealingly mounted in the pipeline mounting holes respectively.

5. The battery pack lower case according to claim 4, characterized by, A sensor hole is further arranged on the adapter (6) and is communicated with the pipeline mounting holes, and a temperature sensor (7) is sealingly mounted in the sensor hole.

6. The battery pack lower case of claim 1, wherein, The medium circulation pipeline (3) is bonded with the bottom plate (2) through a first adhesive layer (8), the shape of the first adhesive layer (8) is the same as the cross-sectional shape of the medium circulation pipeline (3); Further, the material of the first adhesive layer (8) is structural adhesive.

7. The battery pack lower case of claim 1, wherein, The medium circulation pipeline (3) is bonded with the uniform temperature plate (9) through a second adhesive layer (10), the shape of the second adhesive layer (10) is the same as the cross-sectional shape of the medium circulation pipeline (3); Further, the material of the second adhesive layer (10) is heat-conducting adhesive.

8. The battery pack lower case of claim 1, wherein, A third adhesive layer (11) is arranged above the uniform temperature plate (9); Further, the material of the third adhesive layer (11) is heat-conducting adhesive.

9. The battery pack lower case of claim 1, wherein, The plurality of first supporting blocks (12) are arranged along the center line of the uniform temperature plate (9), and / or the plurality of first supporting blocks (12) are arranged in axial symmetry with the center line of the uniform temperature plate (9).

10. The battery pack lower case of claim 1, wherein, The enclosure (1) comprises a first side plate (13), a first end plate (14), a second side plate (15) and a second end plate (16) connected in sequence, a first mounting beam (17) and a second mounting beam (18) are arranged between the first side plate (13) and the second side plate (15), the first mounting beam (17) and the second mounting beam (18) are parallel to the first end plate (14) respectively, the first mounting beam (17) and the second mounting beam (18) are connected to the uniform temperature plate (9), the first mounting beam (17) is connected to the first end plate (14), and the second mounting beam (18) is located on the center line of the uniform temperature plate (9). Further, the medium inlet (4) and the medium outlet (5) are arranged on the outer side of the first end plate (14).

11. The battery pack lower case of claim 10, wherein, The first mounting beam (17) and the second mounting beam (18) are respectively provided with a protruding portion (19), and a fixing hole is formed in the protruding portion (19); and / or, The first mounting beam (17) and the second mounting beam (18) are respectively hollow structures.

12. The battery pack lower case of claim 10, wherein, A third mounting beam (20) is arranged between the first mounting beam (17) and the second mounting beam (18), and a fourth mounting beam (21) is arranged between the second mounting beam (18) and the second end plate (16), the third mounting beam (20) and the fourth mounting beam (21) are parallel to the first side plate (13) respectively, and the third mounting beam (20) and the fourth mounting beam (21) are connected to the uniform temperature plate (9). Further, the third mounting beam (20) and the fourth mounting beam (21) are arranged on the center line of the uniform temperature plate (9).

13. The battery pack lower case of claim 12, wherein, Second support blocks (22) are arranged on the first side plate (13) and the second side plate (15) respectively, third support blocks (23) are arranged on the third mounting beam (20) or the fourth mounting beam (21), the vertical heights of the second support blocks (22) and the third support blocks (23) are the same, and the second support blocks (22) and the third support blocks (23) are on a straight line. Further, fixing holes are formed in the second support blocks (22) and the third support blocks (23) respectively.

14. A battery pack, characterized by The battery pack lower box comprises a cover plate (24) and the battery pack lower box of any one of claims 1-13.

15. The battery pack of claim 14, wherein, The cover plate (24) is fixedly connected with the enclosure (1), and an annular press fitting part (25) is arranged on the cover plate (24), the press fitting part (25) is matched with the shape of the enclosure (1).

16. The battery pack of claim 15, wherein, An edge of the cover plate (24) extends downward to form a first lower edge portion (26), the first lower edge portion (26) extends outward horizontally to form a second lower edge portion (27), the press fitting part (25) is formed with a connected flat plate (28) and a vertical plate (29), the vertical plate (29) is in contact with the first lower edge portion (26), and the flat plate (28) is in contact with the second lower edge portion (27).

17. The battery pack of claim 15 or 16, wherein, The pressing piece (25) comprises a corner piece (30) arranged at a corner of the cover plate (24) and a side piece (31) arranged at a side of the cover plate (24).

18. The battery pack of claim 15 or 16, wherein, The edge of the cover plate (24), the pressing piece (25) and the frame (1) are respectively provided with fixing holes for riveting the pressing piece (25), the cover plate (24) and the frame (1) by a fixing piece.

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