Battery pack box body, battery pack and automobile

Abstract

The utility model discloses a battery pack box body, a battery pack and an automobile. The battery pack box body comprises a tray which forms an accommodating cavity with an opening; the flow channel plate is arranged on the side, away from the containing cavity, of the tray, the flow channel plate is provided with a first sunken part, the first sunken part is sunken in the direction away from the tray, the tray and the first sunken part are arranged in a spaced mode and define a flow channel, and the flow channel is used for circulation of cooling liquid; the cover plate is arranged on the opening in a covering mode so as to seal the containing cavity; wherein the tray is a composite board formed by punching. In this way, the overall height of the battery pack box body and the battery pack can be reduced, and the reliability of the battery pack is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a battery pack box, a battery pack and a vehicle. BACKGROUND

[0002] The battery pack provides power for a new energy vehicle, and generally comprises a tray, a battery cell module and a cold plate. The cold plate is formed by surrounding an upper flow channel plate and a lower flow channel plate, and is fixed in the battery pack box. The battery cell module is bonded to the flow channel plate by glue, so as to realize the functions of fixing, cooling and heating of the battery cell module. The flow channel is formed by stamping on the upper flow channel plate and / or the lower flow channel plate, and is used for flowing of cooling liquid.

[0003] In the related art, the upper flow channel plate and the lower flow channel plate are first welded into a whole, and then connected to the battery pack box by bolts or riveting. The assembly is complex, and the overall height of the battery pack is large. UTILITY MODEL CONTENT

[0004] The application provides a battery pack box, a battery pack and a vehicle, so as to reduce the overall height of the battery pack box and the battery pack, and improve the reliability of the battery pack.

[0005] To solve the above technical problems, the application provides a battery pack box, which comprises a tray forming a containing cavity with an opening, a flow channel plate arranged on a side of the tray away from the containing cavity, the flow channel plate having a first recessed part recessed away from the tray, a tray and the first recessed part being spaced apart and surrounding to form a flow channel for flowing of cooling liquid, and a cover plate covering the opening to close the containing cavity, wherein the tray is a stamping formed composite plate.

[0006] In some embodiments, the composite plate comprises at least a first aluminum layer and a second aluminum layer, wherein the first aluminum layer and the second aluminum layer are different in at least part of alloying components.

[0007] In some embodiments, the flow channel plate is arranged on a side of a bottom wall of the tray away from the containing cavity, and the battery pack box further comprises a bottom guard plate arranged on a side of the flow channel plate away from the bottom wall.

[0008] In some embodiments, the battery pack box further comprises a buffer member arranged between the bottom guard plate and the flow channel plate.

[0009] In some embodiments, the tray is provided with two first side walls arranged in opposite spaces and two second side walls arranged in opposite spaces, and along the thickness direction of the flow channel plate, the size of the first side wall is greater than that of the second side wall.

[0010] In some embodiments, the flow channel plate is arranged on a side of the bottom wall of the tray away from the accommodating cavity; the flow channel plate is provided with a welding area and a non-welding area, the flow channel is arranged in the non-welding area, and the welding area is welded with the bottom wall; the non-welding area is arranged in a spaced manner with the bottom wall and surrounds to form a plurality of spacing areas; the thickness of the flow channel plate is defined as T1; wherein, along the width direction of the flow channel plate, the size of the spacing area is defined as L1, and L1≤20T1; and / or along the thickness direction of the flow channel plate, the size of the bottom wall is defined as T2, and T2≤2T1.

[0011] In some embodiments, the safety factor of the battery pack is defined as α, the size of the flow channel along the thickness direction of the flow channel plate is defined as H1, H1≤αL1, and 1.2≤α<1.5.

[0012] In some embodiments, the thickness of the flow channel plate is defined as T1, the size of the flow channel along the thickness direction of the flow channel plate is defined as H1, and H1≤5T1.

[0013] The application provides a battery pack, which comprises the battery pack case and a cell module arranged in the accommodating cavity.

[0014] The application provides an automobile, which comprises the battery pack.

[0015] The application has the advantages that the battery pack case comprises a tray, a flow channel plate and a cover plate; the tray forms an accommodating cavity with an opening; the flow channel plate is arranged on a side of the tray away from the accommodating cavity, the flow channel plate has a first recessed part, the first recessed part is recessed towards a direction away from the tray, the tray and the first recessed part are arranged in a spaced manner and surround to form a flow channel, and the flow channel is used for flowing of cooling liquid; and the cover plate is arranged on the opening to close the accommodating cavity; wherein, the tray is a stamping-formed composite plate. On the one hand, the tray and the first recessed part surround to form the flow channel, so that the tray is arranged as an upper flow channel plate of the flow channel, the upper flow channel plate is saved, the integration of the battery pack case is improved, the overall height of the battery pack case is reduced, and the assembly complexity is reduced. On the other hand, the tray is a stamping-formed composite plate, the structural strength and the sealing property of the tray are improved, and the reliability of the battery pack is improved. On the other hand, the flow channel plate is arranged outside the tray, the influence of the cooling liquid in the flow channel plate on internal elements such as the cell module is reduced, and the reliability of the battery pack is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description only constitute some embodiments of the present application. All other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings belong to the protection scope of the present application.

[0017] Figure 1 is a structural schematic diagram of an embodiment of a battery pack of the present application;

[0018] Figure 2 is Figure 1 an exploded structural schematic diagram of the embodiment;

[0019] Figure 3 is a structural schematic diagram of an embodiment of a battery pack box of the present application;

[0020] Figure 4 is Figure 3 an exploded structural schematic diagram of the embodiment;

[0021] Figure 5 is Figure 3 a structural schematic diagram of a tray in the embodiment;

[0022] Figure 6 is Figure 3 a structural schematic diagram of a flow channel plate in the embodiment;

[0023] Figure 7 is Figure 1 a structural schematic diagram of part of the structure of the embodiment;

[0024] Figure 8 is Figure 7 a structural schematic diagram of a cross section along A-A in the embodiment. DETAILED DESCRIPTION

[0025] The present application will be further described in detail below in combination with the drawings and embodiments. It is particularly pointed out that the following embodiments are only used to illustrate the present application, but do not limit the scope of the present application. Similarly, the following embodiments are only some embodiments of the present application, but not all embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0026] In the description of the embodiments of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0027] In the embodiments of the present application, unless specifically defined and limited otherwise, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature can be "above", "over" and "on top of" the second feature, which can mean that the first feature is directly above or obliquely above the second feature, or only means that the first feature is higher in horizontal height than the second feature. The first feature can be "below", "under" and "underneath" the second feature, which can mean that the first feature is directly below or obliquely below the second feature, or only means that the first feature is lower in horizontal height than the second feature.

[0028] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0029] In the related art, the battery pack box and the flow channel plate are generally two types of parts, which are assembled and integrated together by a large number of fasteners when in use. In order to reserve installation space for the flow channel plate, part of the height space of the battery pack is generally occupied, causing space waste. The flow channel plate is generally divided into an upper flow channel plate and a lower flow channel plate, which are connected as a whole by brazing, and then connected to the battery pack box by bolt or riveting. However, the battery pack box with such a structure has problems such as complex assembly process, large battery pack height, low structural strength, and cooling liquid easily affecting internal components of the battery pack.

[0030] Therefore, the present application proposes a battery pack box and a battery pack, which designs the battery pack box and the flow channel plate as a whole, can reduce the complexity of the process of assembling the two together, and can save the installation space of the flow channel plate in the height direction of the battery pack (about 10mm can be saved), leaving more space for other parts (such as: larger size and larger capacity battery cells can be selected to increase the cruising range); the present application cancels the upper flow channel plate, and the tray simultaneously serves as a carrier for the battery cell module and internal devices, and also assumes the role of the upper flow channel plate; and in the case of abnormality of cooling liquid leakage of the battery pack, the cooling liquid will not flow into the battery pack to cause short circuit and corrosion.

[0031] The present application first proposes a battery pack, such as Figure 1 andFigure 2 As shown, Figure 1 is a structural schematic diagram of an embodiment of the battery pack of the present application; Figure 2 is Figure 1 is an exploded structural schematic diagram of the embodiment. The battery pack 100 of the embodiment comprises a battery pack box 101 and a battery cell module 60; wherein the battery pack box 101 is formed with a receiving cavity (not marked in the figure), and the battery cell module 60 is arranged in the receiving cavity.

[0032] The battery cell module 60 comprises at least one battery cell group. The battery cell module 60 and other components of the battery pack can be referred to the related art.

[0033] In some embodiments, as Figures 1 to 8 As shown, Figure 3 is a structural schematic diagram of an embodiment of the battery pack box of the present application; Figure 4 is Figure 3 is an exploded structural schematic diagram of the embodiment; Figure 5 is Figure 3 is a structural schematic diagram of the tray in the embodiment; Figure 6 is Figure 3 is a structural schematic diagram of the flow channel plate in the embodiment; Figure 7 is Figure 1 is a structural schematic diagram of part of the structure of the embodiment; Figure 8 is Figure 7 is a sectional structural schematic diagram along A-A in the embodiment. The battery pack box 101 of the embodiment comprises a tray 10, a flow channel plate 20 and a cover plate (not shown in the figure); wherein the tray 10 is formed with a receiving cavity with an opening; the flow channel plate 20 is arranged on the side of the tray 10 away from the receiving cavity, and the flow channel plate 20 has a first recessed part 21 recessed towards the direction away from the tray 10, the tray 10 and the first recessed part 21 are arranged with a space therebetween and surround to form a flow channel 22 for the flow of cooling liquid; and the cover plate 30 is arranged on the opening to close the receiving cavity; wherein the tray 10 is a stamping formed composite plate.

[0034] The receiving cavity is used to place the battery cell module 60 and other components. The tray 10 is a composite plate, and the composite plate can be formed with a receiving cavity with an opening by stamping forming process to form the tray 10.

[0035] On one hand, the flow channel 22 is formed between the tray 10 and the first recess 21, so that the tray 10 is arranged as an upper flow channel plate of the flow channel 22, thereby saving the upper flow channel plate, improving the integration of the battery pack case 101, and reducing the overall height and assembly complexity of the battery pack case 101. On the other hand, the tray 10 is a stamping composite plate, which can improve the structural strength and sealing performance of the tray 10, thereby improving the reliability of the battery pack 100. On the other hand, the flow channel plate 20 is arranged outside the tray 10, which can reduce the influence of the cooling liquid in the flow channel plate 20 on the internal elements such as the battery cell module 60, thereby further improving the reliability of the battery pack 100.

[0036] In some embodiments, the composite plate at least includes a first aluminum layer (not labeled in the figure) and a second aluminum layer (not labeled in the figure); wherein the first aluminum layer and the second aluminum layer are different in at least partial alloying components.

[0037] The composite plate of the present embodiment is realized by an aluminum composite plate, has good thermal conductivity, can improve the heat dissipation performance of the battery pack 100, and the aluminum layer also has good ductility, heat resistance, oxidation resistance, etc., which can improve the reliability of the battery pack 100. Moreover, the aluminum layer is light in weight, which can improve the lightweight effect of the battery pack 100.

[0038] In some embodiments, the first aluminum layer and the second aluminum layer can be 6-series aluminum and 3-series aluminum respectively, and the tray 10 is formed by die heating and stamping, so that the tray 10 has specific lightweight effect, and can improve the strength by more than 50% compared with general 6-series aluminum, thereby greatly improving the safety and reliability of the battery pack 100 and the battery pack case 101 thereof.

[0039] Moreover, the tray 10 is integrally stamped and formed without welds, and has high overall airtightness and reliability, which can further improve the reliability of the battery pack 100.

[0040] In some embodiments, the first aluminum layer and the second aluminum layer can be alternately stacked to form a composite plate, for example, the material of the composite plate is AL6016 / 3003 / 6016.

[0041] In some embodiments, the first aluminum layer or the second aluminum layer can be realized by using 7-series aluminum layer or other aluminum material with higher strength, so as to further improve the structural strength of the tray 10.

[0042] In some embodiments, the flow channel plate 20 can be made of an aluminum plate, for example, a 3-series aluminum plate, etc., and the aluminum plate is fixed to the tray 10 by brazing or laser welding, so as to increase the structural stability.

[0043] In some embodiments, the flow channel plate 20 is arranged on the side of the bottom wall 13 of the tray 10 away from the accommodating cavity, and the battery pack case 101 further includes a bottom guard plate 40 arranged on the side of the flow channel plate 20 away from the bottom wall 13.

[0044] The bottom guard plate 40 is arranged on the side of the flow channel plate 20 away from the bottom wall 13 of the tray 10 to improve the structural strength of the battery pack box 101, protect the flow channel plate 20 and components thereon, and improve the reliability of the battery pack box 101 and the battery pack 100.

[0045] In some embodiments, the bottom guard plate 40 can include a high-strength steel plate which can be fixed to the tray 10 by bolts or FDS connections or the like to improve the structural strength of the battery pack box 101 and the battery pack 100.

[0046] In some embodiments, the outer peripheral region of the bottom guard plate 40 can be provided with a connecting region connected to the outer peripheral region of the tray 10 to avoid the influence of the connection between the bottom guard plate 40 and the tray 10 on the flow channel plate 20.

[0047] In some embodiments, the bottom guard plate 40 can also be fixedly connected with the flow channel plate 20.

[0048] In some embodiments, the battery pack box 101 further includes a buffer 50 arranged between the bottom guard plate 40 and the flow channel plate 20.

[0049] The buffer 50 arranged between the bottom guard plate 40 and the flow channel plate 20 is used to fill the gap between the flow channel plate 20 and the bottom guard plate 40, and also plays a role in dispersing stress when subjected to external force, thereby improving the anti-impact performance of the battery pack box 101 and improving the reliability of the battery pack 100.

[0050] In some embodiments, the buffer 50 can include a buffer foam or the like having a buffering capacity; the buffer foam can be, for example, soft MPP-10 or the like.

[0051] In some embodiments, the tray 10 is provided with two first side walls 14 arranged in opposite relation and two second side walls 12 arranged in opposite relation; the size of the first side wall 14 is greater than the size of the second side wall 12 along the thickness direction z of the flow channel plate 20.

[0052] The tray 10 includes a bottom wall 13 forming a containing cavity, two first side walls 14 arranged in opposite relation, and two second side walls 12 arranged in opposite relation, the first side wall 14 and the second side wall 12 are alternately and sequentially connected to form an annular side wall, one end of the annular side wall is connected with the bottom wall 13, and the other end of the annular side wall is connected with a cover body; the first side wall 14, the second side wall 12 and the bottom wall 13 are integrally formed.

[0053] In the embodiment, the size of the first side wall 14 is greater than the size of the second side wall 12 along the thickness direction z of the flow channel plate 20, so that the tray 10 is arranged in a boat shape, and the external interfaces (not marked in the figure) of the battery pack 100, such as high-voltage ports, low-voltage ports, expansion valve mounting ports, etc., can be arranged on the first side wall 14, and the size of the second side wall 12 is smaller than the size of the first side wall 14, and since the external interfaces do not need to be arranged on the second side wall 12, the weight of the battery pack box 101 can be reduced by reducing the size thereof.

[0054] In some embodiments, the first side wall 14 extends away from the flow channel plate 20 in a first direction and has a first flange surface 111, and the second side wall 12 extends away from the flow channel plate 20 in a second direction and has a second flange surface 121; the size of the first flange surface 111 along the first direction is smaller than the size of the second flange surface 121 along the second direction; the first direction is parallel to the spacing direction of the two first side walls 14, and the second direction is parallel to the spacing direction of the two second side walls 12.

[0055] In the embodiment, the external interfaces and the like are arranged on the first side wall 14, and in order to ensure the structural strength of the tray 10 in each direction, the second flange surface 121 with a larger size is arranged on the second side wall 12, so as to improve the structural strength of the second side wall 12 through the second flange surface 121 with a larger size.

[0056] The first flange surface 111 and the second flange surface 121 are respectively connected with the cover body.

[0057] In some embodiments, the battery pack box 101 further comprises a beam assembly 70 arranged in the accommodation cavity, and the accommodation space is divided into a plurality of sub-accommodation spaces by the beam assembly 70, and each sub-accommodation space is respectively provided with a corresponding battery cell module 60. The beam assembly 70 can improve the installation stability of the battery cell module 60 and improve the structural strength of the battery pack box 100.

[0058] In some embodiments, the beam assembly 70 at least comprises a cross beam (not marked in the figure) and can further comprise a longitudinal beam (not marked in the figure), the cross beam is arranged corresponding to the first side wall 14, and the longitudinal beam is arranged corresponding to the second side wall 12. The cross beam comprises two end cross beams and a middle cross beam, and the end cross beam is arranged on the inner side of the first side wall 14.

[0059] In some embodiments, the tray 10, the beam assembly 70, and the flow channel plate 20 are all made of aluminum. The beam assembly 70 can be connected to the tray 10 by, for example, FDS or arc welding. The cell module 60 can be connected to the beam assembly 70 by, for example, structural glue pouring. The flow channel plate 20 can be fixed to the tray 10 by, for example, laser welding or brazing. The bottom guard plate 40 is made of high-strength steel and is fixed to the lower tray 10 by, for example, bolts or FDS connection. The flow channel plate 20 can also serve as the lower flow channel plate of the reinforcing framework flow channel 22 of the lower tray 10, which can not only increase the overall strength of the battery pack box 101, but also provide a flow path for the cooling liquid of the liquid cooling system. The tray 10 serves as the upper flow channel plate of the flow channel 22, which can improve the leakage of the cooling liquid. The cover plate, the tray 10, the beam assembly 70, the flow channel plate 20, and the bottom guard plate 40 together form the battery pack box 101, which provides support for the structural strength and thermal management of the battery pack 100.

[0060] In some embodiments, the cover plate, the flow channel plate 20, and the tray 10 are all made of steel. Alternatively, in another embodiment, the cover plate is made of aluminum, the flow channel plate 20 and the tray 10 are both made of steel, and the cover plate is bonded or welded to the tray 10, and the flow channel plate 20 is welded to the tray 10.

[0061] In some embodiments, the thickness of the flow channel plate 20 is defined as T1, the size of the flow channel, i.e., the height of the flow channel 22, is defined as H1 along the thickness direction z of the flow channel plate 20, and H1≤5T1.

[0062] If the height H1 of the flow channel 22 is too large, the first recessed portion 21 needs to be recessed deeper, making the flow channel plate 20 weaker. In addition, under the same conditions of the width of the flow channel 22 and the water pressure of the cooling liquid, if the height H1 of the flow channel 22 is too large, the flow rate of the cooling liquid in the flow channel 22 will slow down, which is not conducive to removing the heat of the cells. Therefore, by setting H1≤5T1, it is beneficial to ensure that the cooling liquid flowing through the flow channel 22 has sufficient flow and appropriate flow rate, and also makes the flow channel plate 20 have sufficient structural strength. Specifically, the first recessed portion 21 can be machined on the flow channel plate 20 by stamping.

[0063] In some embodiments, the value of H1 can be 0.5T1, 1.0T1, 1.5T1, 2T1, 2.5T1, 3T1, 3.5T1, 4T1, 4.5T1, 5T1, etc. Of course, within its range, the value of T1 is not limited to this, and it can be set and selected according to actual conditions.

[0064] In some embodiments, 1.5T1≤H1≤4T1. The greater the height H1 of the flow channel 22, the greater the flow rate of the cooling liquid in the flow channel 22 under the condition that the width of the flow channel 22 is the same, thereby being more conducive to heat exchange with the battery cell module 60. Therefore, by setting 1.5T1≤H1≤4T1, that is, by being conducive to ensuring that the cooling liquid flowing through the flow channel 22 has sufficient flow rate and appropriate flow velocity, the flow channel plate 20 also has sufficient structural strength.

[0065] In some embodiments, the flow channel plate 20 is arranged on the side of the bottom wall 13 of the tray 10 away from the accommodation cavity; the flow channel plate 20 also has a second recessed portion 23 recessed toward the direction away from the bottom wall 13, and the side of the second recessed portion 23 away from the bottom wall 13 is connected to the bottom guard plate 40. The second recessed portion 23 is used to connect the flow channel plate 20 and the bottom guard plate 40, for example, by being pasted or welded, etc.

[0066] In some embodiments, the second recessed portion 23 is formed on the flow channel plate 20 by stamping forming processing.

[0067] In some embodiments, the flow channel plate 20 is arranged on the side of the bottom wall 13 of the tray 10 away from the accommodation cavity; the flow channel plate 20 is provided with a welding area 42 and a non-welding area (not marked in the figure), the flow channel 22 is arranged in the non-welding area, and the welding area 42 is welded with the bottom wall 13; the non-welding area is arranged in a spaced manner with the bottom wall 13 and surrounds to form a plurality of spacing areas; the thickness of the flow channel plate 20 is defined as T1; wherein, along the width direction x of the flow channel plate 20, the size of the spacing area is defined as L1, and L1≤20T1; and / or along the thickness direction of the flow channel plate 20, the size of the bottom wall is defined as T2, and T2≤2T1.

[0068] The smaller the non-welding area, that is, the smaller the width L1 of the spacing area, the fewer the connection defects, such as welding defects, between the flow channel plate 20 and the tray 10. Therefore, by setting L1≤20T1, the connection stability between the flow channel plate 20 and the tray 10 can be increased.

[0069] The thickness T2 of the bottom wall 13 of the tray 10 is less than or equal to 2 times the thickness T1 of the flow channel plate 20. Since the first recessed portion 21 and the like need to be processed on the flow channel plate 20, the flow channel plate 20 needs to be made thicker, and the bottom wall of the tray 10 needs to be made thinner, which is conducive to reducing the overall weight of the battery pack 100.

[0070] The non-welding area at least includes the flow channel area 41 where the flow channel 22 is arranged, and the spacing area at least includes the flow channel 22.

[0071] In some embodiments, the safety factor of the battery pack is defined as α, H1≤αL1, and 1.2≤α<1.5. By setting the safety factor, the reliability of the battery pack 100 can be improved.

[0072] wherein, L1≤20T1, H1≤aL1=20aT1, for example, when a is 1.2, H1≤20*1.2T1=8.4T1.

[0073] In some embodiments, a can be 1.2, 1.3, 1.35, 1.4, 1.45, etc. Of course, within its range, the value of a is not limited to this, which can be set and selected according to the actual situation.

[0074] In some embodiments, the thickness of the cover plate is T3, wherein T3<2T1. In one battery pack 100, the size relationship between T1, T2 and T3 has three kinds, respectively, T2<T1; or, T3<2T1; or, T2<2T1 and T3<2T1. Since the first recess 21 needs to be machined on the flow channel plate 20, the first recess 21 needs to be made thicker, and the bottom wall of the tray 10 needs to be made thinner, which is beneficial to reduce the overall weight of the battery pack 100.

[0075] In some embodiments, the thickness of the tray 10 can be 1.2mm-1.8mm. The thickness can be 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, etc. Of course, within its range, the value of the thickness is not limited to this, which can be set and selected according to the actual situation.

[0076] In some embodiments, the tray 10, as the upper flow channel plate of the flow channel plate 20, is provided with two water inlet and outlet ports 31, and the cooling liquid enters and exits through the water inlet and outlet ports 31 to control the overall temperature of the battery pack 100.

[0077] In some embodiments, the flow channel plate 20 is provided with a plurality of flow channel regions 41 and a plurality of welding regions 42, and the plurality of flow channel regions 41 and the plurality of welding regions 42 are arranged in cross to improve the connection stability of the flow channel plate 20 and the tray 10 and the thermal management performance of the tray 10.

[0078] In some embodiments, the first recess 21 and the second recess 23 are arranged in parallel and staggered along the preset direction. In this way, along the flow direction of the cooling liquid in the flow channel 22, the left and right sides of the flow channel 22 can be firmly connected to the bottom wall of the bottom guard plate 40. This makes the stress on the flow channel plate 20 more uniform, and makes the connection between the flow channel plate 20 and the bottom guard plate 40 more firm.

[0079] In some embodiments, the cross beam can be provided with a flow channel to improve the heat transfer performance and improve the reliability of the battery pack 100. And the cross beam can be lightened.

[0080] The flow channel can be an air duct or a cooling liquid flow channel.

[0081] The application further provides a battery pack box body, which can be specifically referred to the above embodiments.

[0082] The battery pack box body provided in the embodiment comprises a tray, a flow channel plate and a cover plate. The tray forms a containing cavity with an opening. The flow channel plate is arranged on the side of the tray away from the containing cavity. The flow channel plate has a first recessed part recessed towards the direction away from the tray. The tray and the first recessed part are arranged in a spaced manner and surround the flow channel. The flow channel is used for the circulation of the cooling liquid. The cover plate is arranged on the opening to close the containing cavity. The tray is a stamping composite plate. On the one hand, the flow channel is formed between the tray and the first recessed part, so that the tray is arranged as the upper flow channel plate of the flow channel, thereby saving the upper flow channel plate, improving the integration of the battery pack box body and reducing the overall height and assembly complexity of the battery pack box body. On the other hand, the tray is a stamping composite plate, which can improve the structural strength and sealing performance of the tray, thereby improving the reliability of the battery pack. On the other hand, the flow channel plate is arranged outside the tray, which can reduce the influence of the cooling liquid in the flow channel plate on the internal elements such as the battery cell module, thereby further improving the reliability of the battery pack.

[0083] Further, the tray of the application has a boat-shaped structure, and the main structure is integrally stamped, without welds. The overall structure has high airtightness and reliability. The material can be AL6016 / 3003 / 6016. This material is a composite plate of 6-series aluminum and 3-series aluminum. After heating by a mold, stamping is performed. The specific lightweight effect can improve the strength by more than 50% compared to general 6-series aluminum materials, thereby greatly improving the overall structural safety and reliability.

[0084] Further, due to the stamping thinning rate of the flow channel plate, the height H1 of the flow channel on the flow channel plate is not more than 5 times the wall thickness T1 of the flow channel plate. The width L1 of the cavity of the welding area of the flow channel plate and the tray is generally not more than 20 times T1, and is generally an integer. The wall thickness T2 of the bottom wall of the tray is not more than 2 times the wall thickness T1 of the flow channel plate. A safety factor of 1.2 times is set, H1 can be defined as H1≤1.2*20T1=8.4T1. Under the condition of meeting the design requirements of the liquid cooling system, the value of H1 should be as small as possible.

[0085] Further, the buffer foam is arranged between the bottom guard plate and the flow channel plate, which is used for gap filling between the flow channel plate and the bottom guard plate, and plays a role in dispersing stress when subjected to external force. This structure can improve the overall structural safety to a certain extent.

[0086] The application further provides an automobile comprising the above battery pack.

[0087] The above merely describes the embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made according to the content of the present application specification and drawings, is also included in the patent protection scope of the present application.

Claims

1. A battery pack case characterized by comprising: The battery pack case comprises: a tray forming a containing cavity with an opening; a flow channel plate provided on a side of the tray away from the containing cavity, the flow channel plate having a first recessed portion recessed away from the tray, the tray and the first recessed portion being spaced apart and surrounding to form a flow channel for cooling liquid to flow through; a cover plate covering the opening to close the containing cavity; wherein the tray is a stamping-formed composite plate.

2. The battery pack enclosure of claim 1, wherein, The composite plate comprises at least a first aluminum layer and a second aluminum layer, wherein the first aluminum layer and the second aluminum layer are different in at least partial alloying components.

3. The battery pack enclosure of claim 1, wherein, The flow channel plate is provided on a side of the bottom wall of the tray away from the containing cavity, and the battery pack case further comprises a bottom guard plate provided on a side of the flow channel plate away from the bottom wall.

4. The battery pack enclosure of claim 3, wherein, The battery pack case further comprises a buffer member provided between the bottom guard plate and the flow channel plate.

5. The battery pack enclosure of claim 1, wherein, The tray is provided with two first side walls spaced apart and two second side walls arranged oppositely, and the size of the first side wall is greater than that of the second side wall in the thickness direction of the flow channel plate.

6. The battery pack enclosure of any one of claims 1 to 5, wherein, The flow channel plate is provided on a side of the bottom wall of the tray away from the containing cavity, and the flow channel plate is provided with a welding area and a non-welding area, the flow channel is provided in the non-welding area, and the welding area is welded with the bottom wall; the non-welding area and the bottom wall are spaced apart and surrounding to form a plurality of interval areas; the thickness of the flow channel plate is defined as T1; wherein, along the width direction of the flow channel plate, the size of the interval area is defined as L1, and L1≤20T1; and / or along the thickness direction of the flow channel plate, the size of the bottom wall is defined as T2, and T2≤2T1.

7. The battery pack enclosure of claim 6, wherein, The safety factor of the battery pack is defined as α, the size of the flow channel is defined as H1 in the thickness direction of the flow channel plate, H1≤αL1, and 1.2≤α<1.

5.

8. The battery pack case according to any one of claims 1 to 5, characterized by, The thickness of the flow channel plate is defined as T1, and the size of the flow channel is defined as H1 in the thickness direction of the flow channel plate, and H1≤5T1.

9. A battery pack, characterized by, The battery pack comprises: the battery pack case according to any one of claims 1 to 8; a cell module provided in the containing cavity.

10. An automobile characterized by comprising: The automobile comprises the battery pack according to claim 9.

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