Battery assembly, battery assembly design method and vehicle

Abstract

The present invention provides an electric cell, a battery module, a battery assembly, a battery assembly design method and a vehicle. The main body of the electric cell is a cuboid, and the main body includes a first side face and a second side face arranged at intervals along the height direction of the cuboid, a third side face and a fourth side face arranged at intervals along the length direction of the cuboid, and a fifth side face and a sixth side face arranged at intervals along the width direction of the cuboid. The electric cell further includes: an electric cell positive electrode and an electric cell negative electrode which are arranged on the first side face of the main body and are respectively close to the third side face and the fourth side face of the main body; two electric cell fixing hole groups which are arranged on the main body and are symmetrical about the central plane between the third side face and the fourth side face, and each electric cell fixing hole group includes at least one electric cell fixing hole penetrating through the width direction of the cuboid, and each electric cell fixing hole is used for a liquid cooling pipe to pass through, so as to solve the problems in the prior art that the heat management performance is poor and the integration efficiency of the battery assembly is low due to the complex fixing structure and heat management structure of the electric cell.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular, to a battery assembly, a battery assembly design method, and a vehicle. Background Art

[0002] Due to the increasing living standards of the people, cars have become essential items for every family. However, with the increase in the number of gasoline-powered vehicles, the pollutants such as harmful gases generated by them have polluted our living environment to an unbearable extent. Therefore, we must find new energy sources that can replace gasoline to a certain extent to relieve the environmental pressure on us.

[0003] Based on such a situation, new energy vehicles using power batteries have become the new favorites of people due to their obvious advantages. First of all, new energy vehicles using power batteries can save more costs compared with gasoline-powered vehicles. Secondly, since the battery does not undergo an oxidation reaction with oxygen, there are no extra waste gases discharged during the charging and discharging process, effectively preventing environmental pollution.

[0004] In the new energy vehicle industry, power batteries are an important component. A power battery is composed of at least one battery module, and a battery module is a structure in which multiple single cells are connected in series and / or in parallel to meet the required voltage and power requirements. At present, the shapes of hard-shell single cells are mainly square and cylindrical. In the design and manufacturing process of the battery grouping structure, the corresponding grouping components and production processes for square cells and cylindrical cells are not the same. The grouping structure of cylindrical cells is relatively stable, and the anti-seismic performance is becoming more and more mature. At present, most square cells rely on the extrusion between the cell and the box body to achieve the grouping structure, which will pose a great safety hazard. Therefore, various enterprises, universities and other institutions are still constantly exploring the grouping methods of square cells.

[0005] As the core component of new energy vehicles (i.e., electric vehicles), the structural safety performance and thermal management performance of power batteries are both very important. At present, the solutions for battery assemblies using square cells are standard module or CTP configuration battery assemblies. The structures of these two solutions are relatively complex and have two major problems. One is that due to the limitation of the height of the vertical arrangement, the integration degree of the battery assembly is relatively low; the other is that the thermal management performance is poor, and it is impossible to ensure the temperature consistency between multiple cells and inside the cells of the battery. Summary of the Invention

[0006] The main object of the present invention is to provide a battery assembly, a battery assembly design method, and a vehicle to solve the problems of poor thermal management performance and low integration efficiency of the battery assembly caused by the complex fixed structure and thermal management structure of the cells in the prior art.

[0007] To achieve the above object, according to the first aspect of the present invention, a battery cell is provided. The main body of the battery cell is a cuboid, and the main body includes a first side surface and a second side surface arranged at intervals along the height direction of the cuboid, a third side surface and a fourth side surface arranged at intervals along the length direction of the cuboid, and a fifth side surface and a sixth side surface arranged at intervals along the width direction of the cuboid. The battery cell further includes: a battery cell positive electrode and a battery cell negative electrode, which are arranged on the first side surface of the main body and are respectively close to the third side surface and the fourth side surface of the main body; two battery cell fixing hole groups, both of which are arranged on the main body and are symmetrically arranged with respect to the central plane. Each battery cell fixing hole group includes at least one battery cell fixing hole penetrating through the width direction of the cuboid, and each battery cell fixing hole is used for a liquid cooling pipe to pass through. Wherein, the central plane is located between the third side surface and the fourth side surface, the central plane is parallel to both the third side surface and the fourth side surface, and the third side surface and the fourth side surface are symmetrically arranged with respect to the central plane.

[0008] Further, the battery cell fixing hole is a round hole.

[0009] Further, the value range of the diameter of the battery cell fixing hole is 10 mm to 20 mm; and / or the minimum value of the distance between the center line of the battery cell fixing hole and the third side surface or the fourth side surface is 8 mm.

[0010] Further, the battery cell includes: a plurality of battery cell fins, which are fixed in the battery cell fixing holes and are arranged at intervals along the length direction of the battery cell fixing holes for contacting with the liquid cooling pipe passing through the battery cell fixing holes.

[0011] According to the second aspect of the present invention, a battery module is provided, including: a plurality of battery cells, each of which is the above-mentioned battery cell, and the plurality of battery cells are arranged in sequence along a predetermined direction. The battery cell fixing holes of the plurality of battery cells that are sequentially connected along the predetermined direction together form an installation long hole. Wherein, the predetermined direction is parallel to the width direction of the main body of the battery cell; a liquid cooling pipe is arranged in the installation long hole to dissipate heat from the plurality of battery cells.

[0012] Further, the liquid cooling pipe includes a pipe body and at least one partition arranged inside the pipe body to divide the inside of the pipe body into a plurality of cavities.

[0013] According to a third aspect of the present invention, there is provided a battery assembly, comprising: a battery module, which is the above-mentioned battery module; a lower box body and a lower box body frame disposed at least partially surrounding the lower box body to jointly enclose a box space for accommodating the battery module, and refrigerant circulation pipelines are provided inside both the lower box body and the lower box body frame, and the refrigerant circulation pipeline includes a refrigerant inflow pipeline and a refrigerant outflow pipeline; a refrigerant inflow joint and a refrigerant outflow joint, which are disposed on the lower box body or the lower box body frame and are respectively used for connecting to the inlet of the refrigerant inflow pipeline and the outlet of the refrigerant outflow pipeline; wherein, both ends of the liquid cooling pipe in the battery module are fixedly connected to the lower box body frame, the inlet of the liquid cooling pipe is used for connecting to the outlet of the refrigerant inflow pipeline, and the outlet of the liquid cooling pipe is connected to the inlet of the refrigerant outflow pipeline.

[0014] According to a fourth aspect of the present invention, there is provided a battery assembly design method for designing the above-mentioned battery module. The battery assembly design method includes: determining the limit area S of the battery cell fixing hole according to the minimum allowable capacity CM of the battery cell and the process limit size GC, S = CM * CC * GC * exp(A); wherein, CC is a capacity-related structure coefficient, and the value range of CC is 0.8 to 0.95; A is a weight compensation parameter, and the value range of A is -0.85 to 0; determining the aperture D of the battery cell fixing hole according to the limit area S of the battery cell fixing hole, D = S / (π * (GB / E)^2 / 4); wherein, GB is the process length limit size; E is a safety size coefficient, and the value range of E is 1.03 to 1.53; performing simulation calculations on the above-mentioned battery assembly according to the above various parameters to perform feedback correction when the simulation result is unqualified.

[0015] Further, determining the thickness H of the partition in the liquid cooling pipe according to the limit area S of the battery cell fixing hole, H = S / A * 0.92.

[0016] According to a fifth aspect of the present invention, there is provided a vehicle comprising the above-mentioned battery assembly.

[0017] Applying the technical solution of the present invention, the main body of the battery cell of the present invention is a rectangular parallelepiped, and the main body includes a first side surface, a second side surface, a third side surface, a fourth side surface, a fifth side surface and a sixth side surface which together form the outer circumference of the main body of the battery cell. The first side surface and the second side surface are arranged opposite to each other and spaced apart along the height direction of the rectangular parallelepiped, the third side surface and the fourth side surface are arranged opposite to each other and spaced apart along the length direction of the rectangular parallelepiped, and the fifth side surface and the sixth side surface are arranged opposite to each other and spaced apart along the width direction of the rectangular parallelepiped; a positive electrode and a negative electrode are provided on the main body of the battery cell, the positive electrode and the negative electrode are both located on the first side surface of the main body, and the positive electrode and the negative electrode are respectively located on the third side surface and the fourth side surface of the first side surface close to the main body. , one end of the positive electrode of the battery cell and the negative electrode of the battery cell are connected to the inside of the main body of the battery cell, and the other end of the positive electrode of the battery cell and the negative electrode of the battery cell extend toward the outside of the main body of the battery cell; the battery cell also includes: two battery cell fixing hole groups, the two battery cell fixing hole groups are both located on the main body and are symmetrically arranged with respect to the center plane, each battery cell fixing hole group includes at least one battery cell fixing hole arranged through the width direction of the rectangular parallelepiped, that is, both ends of each battery cell fixing hole are connected with the fifth side surface and the sixth side surface respectively, and each battery cell fixing hole is used for the liquid cooling pipe to pass through; wherein, the center plane is located between the third side surface and the fourth side surface, the center plane is parallel to the third side surface and the fourth side surface, and the third side surface and the fourth side surface are symmetrically arranged with respect to the center plane. In this way, when multiple battery cells of the present invention are used to form a battery module, the battery module can be fixed, cooled, and heated simply by setting liquid cooling tubes running through the multiple battery cells, thereby achieving a high degree of integration of the battery thermal management system and the battery assembly of the power battery having the battery module, achieving rapid cooling and rapid heating of the power battery, improving the overall energy utilization rate of the power battery, and solving the problem in the prior art of poor thermal management performance and low battery assembly integration efficiency due to the complex battery cell fixing structure and thermal management structure. In addition, multiple liquid cooling tubes are respectively passed through the multiple battery cell fixing holes of the two battery cell fixing hole groups symmetrically arranged about the center plane, effectively reducing the inconsistency of the thermal performance inside the battery cell, achieving uniformity of the force inside the battery cell, improving the safety of the battery cell, and ensuring the battery cell service life as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 A schematic structural diagram of an embodiment of a battery cell according to the present invention is shown;

[0020] Figure 2 Shown with Figure 1 A schematic structural diagram of a battery module of the battery cell shown;

[0021] Figure 3 shows Figure 2 a schematic structural view of the liquid cooling pipe of the battery module shown;

[0022] Figure 4 shows a battery assembly having Figure 2 a schematic structural view of the battery assembly of the battery module shown;

[0023] Figure 5 shows Figure 4 a schematic structural view of the battery assembly shown when the lower box frame is not included.

[0024] Among them, the above-mentioned drawings include the following reference numerals:

[0025] 1. Lower box frame; 11. Outer frame body; 12. Intermediate cross beam; 2. Battery module; 20. Battery cell; 200. Housing; 201. Battery cell fixing hole; 202. Battery cell fin; 203. Explosion-proof valve; 204. Battery cell positive electrode; 205. Battery cell negative electrode; 206. Top cover; 3. Lower box; 4. Connector; 41. Refrigerant inlet connector; 42. Refrigerant outlet connector; 5. Liquid cooling pipe; 500. Pipe body; 501. Partition; 502. Cavity; 5021. Refrigerant inlet cavity; 5022. Refrigerant outlet cavity. Detailed implementation manners

[0026] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the drawings and in combination with the embodiments. Although the preferred embodiments of the present invention are shown in the drawings, the present invention can be implemented in many different forms and is not limited to the embodiments described in the text. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention understood more thoroughly and comprehensively.

[0027] Such as Figure 1As shown in the figure, the present invention provides an electric core. The main body of the electric core is a cuboid, and the main body includes a first side surface and a second side surface arranged at intervals along the height direction of the cuboid, a third side surface and a fourth side surface arranged at intervals along the length direction of the cuboid, and a fifth side surface and a sixth side surface arranged at intervals along the width direction of the cuboid; the electric core further includes: an electric core positive electrode 204 and an electric core negative electrode 205, which are arranged on the first side surface of the main body and are respectively arranged close to the third side surface and the fourth side surface of the main body; two electric core fixing hole groups, both of which are arranged on the main body and are symmetrically arranged with respect to the central plane between the third side surface and the fourth side surface. Each electric core fixing hole group includes at least one electric core fixing hole 201 penetrating through the width direction of the cuboid, and each electric core fixing hole 201 is used for a liquid cooling pipe 5 to pass through; wherein, the central plane is located between the third side surface and the fourth side surface, the central plane is parallel to both the third side surface and the fourth side surface, and the third side surface and the fourth side surface are symmetrically arranged with respect to the central plane.

[0028] The main body of the electric core of the present invention is a cuboid. The main body includes a first side surface, a second side surface, a third side surface, a fourth side surface, a fifth side surface and a sixth side surface that jointly enclose the outer peripheral surface of the main body of the electric core. The first side surface and the second side surface are arranged opposite to each other and at intervals along the height direction of the cuboid. The third side surface and the fourth side surface are arranged opposite to each other and at intervals along the length direction of the cuboid. The fifth side surface and the sixth side surface are arranged opposite to each other and at intervals along the width direction of the cuboid. An electric core positive electrode 204 and an electric core negative electrode 205 are arranged on the main body of the electric core. Both the electric core positive electrode 204 and the electric core negative electrode 205 are located on the first side surface of the main body, and the electric core positive electrode 204 and the electric core negative electrode 205 are respectively located at positions on the first side surface close to the third side surface and the fourth side surface of the main body. One end of the electric core positive electrode 204 and the electric core negative electrode 205 is connected to the inside of the main body of the electric core, and the other end of the electric core positive electrode 204 and the electric core negative electrode 205 extends towards the outside of the main body of the electric core. The electric core further includes: two electric core fixing hole groups, both of which are located on the main body and are symmetrically arranged with respect to the central plane. Each electric core fixing hole group includes at least one electric core fixing hole 201 penetrating through the width direction of the cuboid, that is, both ends of each electric core fixing hole 201 are communicated with the fifth side surface and the sixth side surface respectively, and each electric core fixing hole 201 is used for a liquid cooling pipe 5 to pass through; wherein, the central plane is located between the third side surface and the fourth side surface, the central plane is parallel to both the third side surface and the fourth side surface, and the third side surface and the fourth side surface are symmetrically arranged with respect to the central plane.

[0029] Thus, when multiple battery cells of the present invention are used to form a battery module, the battery module can be fixed, cooled, and heated only by arranging the liquid cooling tubes 5 penetrating through the multiple battery cells, achieving a high degree of integration of the battery thermal management system and the battery assembly of the power battery with the battery module, realizing rapid cooling and rapid heating of the power battery, improving the overall energy utilization rate of the power battery, and solving the problems in the prior art that the thermal management performance is poor and the integration efficiency of the battery assembly is low due to the complex fixing structure and thermal management structure of the battery cells. In addition, the multiple liquid cooling tubes 5 are respectively arranged in the multiple battery cell fixing holes 201 of the two battery cell fixing hole groups symmetrically arranged about the central plane, effectively reducing the inconsistency of the thermal performance inside the battery cells, realizing the uniformity of the force inside the battery cells, improving the safety of the battery cells, and ensuring the service life of the battery cells as much as possible.

[0030] As Figure 1 shown, the X-direction, Y-direction, and Z-direction are perpendicular to each other in pairs, and the height direction of the cuboid is the Figure 1 Z-direction in Figure 1 the length direction of the cuboid is the Figure 1 X-direction in

[0031] Specifically, a battery cell refers to a single electrochemical cell containing positive and negative electrodes. Generally, it is not directly used, but multiple battery cells are combined to form a battery module for use.

[0032] The battery cell of the present invention is a square battery cell, which is processed by a winding process or a stacking process.

[0033] In the embodiment of the battery cell of the present invention Figure 1 shown, each battery cell fixing hole group on the main body of the battery cell includes one battery cell fixing hole 201, that is, a total of two battery cell fixing holes 201 are provided on the main body of the battery cell. These two battery cell fixing holes 201 are symmetrically arranged about the central plane. One battery cell fixing hole 201 is close to the third side surface, and the other battery cell fixing hole 201 is close to the fourth side surface.

[0034] In the embodiment of the battery cell not shown in the present invention, each battery cell fixing hole group on the main body of the battery cell includes multiple battery cell fixing holes 201. The multiple battery cell fixing holes 201 in one battery cell fixing hole group are symmetrically arranged one by one with the multiple battery cell fixing holes 201 in the other battery cell fixing hole group about the central plane. The multiple battery cell fixing holes 201 in one battery cell fixing hole group are all located on one side of the central plane close to the third side surface, and the multiple battery cell fixing holes 201 in the other battery cell fixing hole group are all located on one side of the central plane close to the fourth side surface; among them, the multiple battery cell fixing holes 201 in each battery cell fixing hole group are arranged at intervals in the height direction of the cuboid.

[0035] In an embodiment of the battery cell of the present invention not shown in the figure, each battery cell fixing hole group on the main body of the battery cell includes a plurality of battery cell fixing holes 201. The plurality of battery cell fixing holes 201 in one battery cell fixing hole group are symmetrically arranged in pairs with the plurality of battery cell fixing holes 201 in another battery cell fixing hole group with respect to the central plane. The plurality of battery cell fixing holes 201 in one battery cell fixing hole group are all located on one side of the central plane close to the third side surface, and the plurality of battery cell fixing holes 201 in another battery cell fixing hole group are all located on one side of the central plane close to the fourth side surface; wherein, the plurality of battery cell fixing holes 201 in each battery cell fixing hole group are arranged at intervals in sequence along the length direction of the cuboid.

[0036] In an embodiment of the battery cell of the present invention not shown in the figure, each battery cell fixing hole group on the main body of the battery cell includes a plurality of battery cell fixing holes 201. The plurality of battery cell fixing holes 201 in one battery cell fixing hole group are symmetrically arranged in pairs with the plurality of battery cell fixing holes 201 in another battery cell fixing hole group with respect to the central plane. The plurality of battery cell fixing holes 201 in one battery cell fixing hole group are all located on one side of the central plane close to the third side surface, and the plurality of battery cell fixing holes 201 in another battery cell fixing hole group are all located on one side of the central plane close to the fourth side surface; wherein, in each battery cell fixing hole group, a part of the battery cell fixing holes 201 are arranged at intervals in sequence along the height direction of the cuboid, and another part of the battery cell fixing holes 201 are arranged at intervals in sequence along the length direction of the cuboid.

[0037] In an embodiment of the battery cell of the present invention not shown in the figure, each battery cell fixing hole group on the main body of the battery cell includes a plurality of battery cell fixing holes 201. The plurality of battery cell fixing holes 201 in one battery cell fixing hole group are symmetrically arranged in pairs with the plurality of battery cell fixing holes 201 in another battery cell fixing hole group with respect to the central plane. The plurality of battery cell fixing holes 201 in one battery cell fixing hole group are all located on one side of the central plane close to the third side surface, and the plurality of battery cell fixing holes 201 in another battery cell fixing hole group are all located on one side of the central plane close to the fourth side surface; wherein, the plurality of battery cell fixing holes 201 in each battery cell fixing hole group are arranged in a rectangular array or a circular array or a triangular array.

[0038] In an embodiment of the battery cell of the present invention not shown in the figure, each battery cell fixing hole group on the main body of the battery cell includes a plurality of battery cell fixing holes 201. The plurality of battery cell fixing holes 201 in one battery cell fixing hole group are symmetrically arranged in pairs with the plurality of battery cell fixing holes 201 in another battery cell fixing hole group with respect to the central plane. The plurality of battery cell fixing holes 201 in one battery cell fixing hole group are all located on one side of the central plane close to the third side surface, and the plurality of battery cell fixing holes 201 in another battery cell fixing hole group are all located on one side of the central plane close to the fourth side surface; wherein, the plurality of battery cell fixing holes 201 in each battery cell fixing hole group are arranged at intervals in sequence along a predetermined direction, and the predetermined direction is not parallel to the length direction and the height direction of the cuboid.

[0039] In an embodiment not shown in the drawings of the battery cell of the present invention, each battery cell fixing hole group on the main body of the battery cell includes a plurality of battery cell fixing holes 201. The plurality of battery cell fixing holes 201 in one battery cell fixing hole group are symmetrically arranged in pairs with the plurality of battery cell fixing holes 201 in another battery cell fixing hole group with respect to the central plane. The plurality of battery cell fixing holes 201 in one battery cell fixing hole group are all located on one side of the central plane close to the third side surface, and the plurality of battery cell fixing holes 201 in another battery cell fixing hole group are all located on one side of the central plane close to the fourth side surface; wherein, the plurality of battery cell fixing holes 201 in each battery cell fixing hole group are arranged in a random state.

[0040] As Figure 1 shown, the main body of the battery cell of the present invention includes a housing, and the housing is composed of a shell 200 and a top cover 206. The shell 200 includes a receiving cavity for receiving structures such as a pole group and an opening portion located above the receiving cavity. The top cover 206 is covered at the opening portion to enclose the receiving cavity in the shell 200. Among them, the first side surface, the second side surface, the third side surface, the fourth side surface and the fifth side surface of the main body are all located on the shell 200, and the sixth side surface of the main body is located on the top cover 206.

[0041] As Figure 1 shown, the battery cell of the present invention further includes a battery cell explosion-proof valve 203. The battery cell explosion-proof valve 203 is provided on the first side surface of the main body. The battery cell positive electrode 204 is located on one side of the battery cell explosion-proof valve 203 close to the third side surface of the main body, and the battery cell negative electrode 205 is located on one side of the battery cell explosion-proof valve 203 close to the fourth side surface of the main body; the battery cell explosion-proof valve 203 is used to relieve pressure in time when the internal pressure of the battery cell rises sharply, so as to maintain the air pressure balance inside and outside the battery cell, avoid explosion of the battery cell, and reduce potential safety hazards.

[0042] Preferably, the battery cell fixing hole 201 is a round hole to ensure the uniformity of the internal force of the battery cell fixed by the liquid cooling pipe 5 inserted into the battery cell fixing hole 201, and avoid premature damage of the battery cell due to uneven force.

[0043] Optionally, the battery cell fixing hole 201 can also be a triangular hole, or a square hole, or an oval hole or a hole with other regular or irregular shapes, but the holes of these shapes do not have as good an effect as the round hole in ensuring the uniformity of the internal force of the battery cell.

[0044] Further preferably, the diameter of the battery cell fixing hole 201 ranges from 10 mm to 20 mm.

[0045] Further preferably, the minimum value of the distance between the center line of the battery cell fixing hole 201 and the third side surface or the fourth side surface is 8 mm.

[0046] When the battery cell fixing hole 201 is arranged close to the third side surface, the minimum distance between the center line of the battery cell fixing hole 201 and the third side surface is 8 mm.

[0047] When the battery cell fixing hole 201 is arranged close to the fourth side surface, the minimum distance between the center line of the battery cell fixing hole 201 and the fourth side surface is 8 mm.

[0048] As Figure 1 shown, the battery cell includes: a plurality of battery cell fins 202, and the plurality of battery cell fins 202 are fixed in the battery cell fixing hole 201 and arranged at intervals along the length direction of the battery cell fixing hole 201 for contacting with the liquid cooling pipe 5 penetrating through the battery cell fixing hole 201.

[0049] Specifically, since the liquid cooling pipe 5 needs to penetrate through the battery cell fixing hole 201, in order to realize this penetration action, the inner diameter of the battery cell fixing hole 201 needs to be set larger than the outer diameter of the liquid cooling pipe 5, that is, a clearance fit is provided between the battery cell fixing hole 201 and the liquid cooling pipe 5.

[0050] Meanwhile, in order to ensure the heat transfer effect between the main body of the battery cell and the liquid cooling pipe 5 and improve the heat transfer efficiency, a plurality of battery cell fins 202 are arranged in the battery cell fixing hole 201, and each battery cell fin 202 is set as at least part of an annular plate body. The outer peripheral surface of each battery cell fin 202 is fixedly connected to the inner wall surface of the corresponding battery cell fixing hole 201, and the inner peripheral surface of each battery cell fin 202 is in contact with the outer wall surface of the corresponding liquid cooling pipe 5, so as to increase the heat transfer speed between the liquid cooling pipe 5 and the main body of the battery cell, enhance the friction force between the liquid cooling pipe 5 and the main body of the battery cell, and reduce the deformation caused by the expansion of the battery cell.

[0051] As Figure 2 shown, the present invention provides a battery module, including: a plurality of battery cells 20, each of the battery cells 20 being the above-mentioned battery cell, the plurality of battery cells 20 being arranged in sequence along a predetermined direction, and the battery cell fixing holes 201 that are sequentially communicated along the predetermined direction of the plurality of battery cells 20 together form an installation long hole; wherein, the predetermined direction is parallel to the width direction of the main body of the battery cell; a liquid cooling pipe 5, penetrating through the installation long hole to dissipate heat from the plurality of battery cells 20.

[0052] Specifically, each battery cell fixing hole group on the main body of each battery cell 20 includes one battery cell fixing hole 201; the battery cell fixing holes 201 of the plurality of battery cells 20 arranged close to the third side surface are sequentially communicated along the predetermined direction, and the battery cell fixing holes 201 of the plurality of battery cells 20 arranged close to the fourth side surface are also sequentially communicated along the predetermined direction to form two installation long holes, and one liquid cooling pipe 5 is penetrated through each installation long hole; wherein, the two liquid cooling pipes 5 are symmetrically arranged with respect to the central plane of each battery cell 20.

[0053] As Figure 3As shown, the liquid cooling pipe 5 includes a pipe body 500 and at least one partition 501 disposed inside the pipe body 500 to divide the interior of the pipe body 500 into a plurality of cavities 502, so as to increase the strength of the liquid cooling pipe 5, improve the heat transfer capacity of the liquid cooling pipe 5, and enhance the cooling and heating effects of the liquid cooling pipe 5.

[0054] Wherein, the ratio of the thickness of the partition 501 to the outer diameter of the liquid cooling pipe 5 is 0.1 to 0.5.

[0055] Preferably, the outer diameter of the liquid cooling pipe 5 ranges from 2 mm to 5 mm.

[0056] Preferably, the thickness of the partition 501 ranges from 0.2 mm to 2.5 mm.

[0057] In the embodiment Figures 1 to 5 shown in the present invention, the battery cell fixing hole 201 is a circular hole, and the liquid cooling pipe 5 is also a circular pipe matching therewith. One partition 501 is disposed inside the pipe body 500 of the liquid cooling pipe 5 to divide the interior of the pipe body 500 into two cavities 502, so that the cross-section of the liquid cooling pipe forms a "day" character structure similar to a round edge; wherein, a refrigerant inlet is provided at the first end of the liquid cooling pipe 5, and a refrigerant outlet is provided at the second end of the liquid cooling pipe 5. One end of each cavity 502 close to the first end of the liquid cooling pipe 5 is the refrigerant inlet, and one end of each cavity 502 close to the second end of the liquid cooling pipe 5 is the refrigerant outlet.

[0058] In a first embodiment not shown of the liquid cooling pipe 5 of the present invention, no partition 501 is disposed inside the pipe body 500 of the liquid cooling pipe 5; wherein, the first end of the liquid cooling pipe 5 is the refrigerant inlet, and the second end of the liquid cooling pipe 5 is the refrigerant outlet.

[0059] In a second embodiment not shown of the liquid cooling pipe 5 of the present invention, a plurality of partitions 501 are disposed inside the pipe body 500 of the liquid cooling pipe 5, and the number of the partitions 501 is odd. The plurality of partitions 501 are sequentially spaced apart along a predetermined direction to divide the interior of the pipe body 500 into a plurality of cavities 502, and the number of the cavities 502 is even; wherein, a refrigerant inlet is provided at the first end of the liquid cooling pipe 5, and a refrigerant outlet is provided at the second end of the liquid cooling pipe 5. One end of each cavity 502 close to the first end of the liquid cooling pipe 5 is the refrigerant inlet, and one end of each cavity 502 close to the second end of the liquid cooling pipe 5 is the refrigerant outlet.

[0060] In a third embodiment (not shown) of the liquid cooling pipe 5 of the present invention, a plurality of partition plates 501 are provided inside the pipe body 500 of the liquid cooling pipe 5, the number of the partition plates 501 is odd, and the plurality of partition plates 501 are sequentially arranged at intervals in a predetermined direction to divide the inside of the pipe body 500 into a plurality of cavities 502 that are sequentially connected head to tail, and the number of the cavities 502 is even; wherein, a refrigerant inlet and a refrigerant outlet are provided at the first end of the liquid cooling pipe 5, the second end of the liquid cooling pipe 5 is closed, the plurality of cavities 502 include a refrigerant inflow cavity 5021, and one end of the refrigerant inflow cavity 5021 close to the first end of the liquid cooling pipe 5 is the refrigerant inlet, the plurality of cavities 502 include a refrigerant outflow cavity 5022, and one end of the refrigerant outflow cavity 5022 close to the first end of the liquid cooling pipe 5 is the refrigerant outlet.

[0061] In a fourth embodiment (not shown) of the liquid cooling pipe 5 of the present invention, a plurality of partition plates 501 are provided inside the pipe body 500 of the liquid cooling pipe 5, the number of the partition plates 501 is even, and the plurality of partition plates 501 are sequentially arranged at intervals in a predetermined direction to divide the inside of the pipe body 500 into a plurality of cavities 502 that are sequentially connected head to tail, and the number of the cavities 502 is odd; wherein, a refrigerant inlet is provided at the first end of the liquid cooling pipe 5, a refrigerant outlet is provided at the second end of the liquid cooling pipe 5, the plurality of cavities 502 include a refrigerant inflow cavity 5021, and one end of the refrigerant inflow cavity 5021 close to the first end of the liquid cooling pipe 5 is the refrigerant inlet, the plurality of cavities 502 include a refrigerant outflow cavity 5022, and one end of the refrigerant outflow cavity 5022 close to the second end of the liquid cooling pipe 5 is the refrigerant outlet.

[0062] In a fifth embodiment (not shown) of the liquid cooling pipe 5 of the present invention, a plurality of partition plates 501 are provided inside the pipe body 500 of the liquid cooling pipe 5 to divide the inside of the pipe body 500 into a plurality of cavities 502; wherein, a refrigerant inlet and a refrigerant outlet are provided at the first end of the liquid cooling pipe 5, and a refrigerant inlet and a refrigerant outlet are also provided at the second end of the liquid cooling pipe 5; both ends of at least one cavity 502 are respectively communicated with the refrigerant inlet at the first end of the liquid cooling pipe 5 and the refrigerant outlet at the second end of the liquid cooling pipe 5; at least two cavities 502 are connected head to tail to form a structure including a refrigerant inflow cavity 5021 and a refrigerant outflow cavity 5022, the refrigerant inflow cavity 5021 is communicated with the refrigerant inlet at the first end or the second end of the liquid cooling pipe 5, and the refrigerant outflow cavity 5022 is communicated with the refrigerant outlet at the first end or the second end of the liquid cooling pipe 5.

[0063] As Figure 4As shown in the figure, the present invention provides a battery assembly, comprising: a battery module 2, which is the above-mentioned battery module; a lower box body 3 and a lower box body frame 1 disposed at least partially around the lower box body 3 to jointly enclose a box space for accommodating the battery module 2. Refrigerant circulation pipelines are provided inside both the lower box body 3 and the lower box body frame 1. The refrigerant circulation pipeline includes a refrigerant inlet pipeline and a refrigerant outlet pipeline; a refrigerant inlet joint 41 and a refrigerant outlet joint 42, which are disposed on the lower box body 3 or the lower box body frame 1 and are respectively used for connecting to the inlet of the refrigerant inlet pipeline and the outlet of the refrigerant outlet pipeline; wherein, both ends of the liquid cooling pipe 5 in the battery module 2 are fixedly connected to the lower box body frame 1. The inlet of the liquid cooling pipe 5 is used for connecting to the outlet of the refrigerant inlet pipeline, and the outlet of the liquid cooling pipe 5 is connected to the inlet of the refrigerant outlet pipeline.

[0064] As Figure 4 shown in the figure, the lower box body frame 1 includes an outer frame body 11 and an intermediate cross beam 12. The outer frame body 11 is disposed around the circumferential side of the lower box body 3. The intermediate cross beam 12 is disposed above the lower box body 3 and at the middle part of the lower box body 3 to divide the box space formed between the outer frame body 11 and the lower box body 3 into two separate spaces. A plurality of battery modules 2 are sequentially arranged at intervals along the length direction of the corresponding separate space in each separate space. One end of the liquid cooling pipe 5 of each battery module 2 is fixed to the outer frame body 11, and the other end of the liquid cooling pipe 5 of each battery module 2 is fixed to the intermediate cross beam 12.

[0065] Specifically, the lower box body 3 in the battery assembly of the present invention is a thin metal plate for carrying the battery module 2 and sealing the bottom of the lower box body frame 1.

[0066] As Figure 4 and Figure 5 shown in the figure, a part of the refrigerant circulation pipeline is disposed inside the lower box body 3, and another part of the refrigerant circulation pipeline is disposed inside the lower box body frame 1; at least two pipe joints 4 are provided on one side of the lower box body 3. The at least two pipe joints 4 include a refrigerant inlet joint 41 and a refrigerant outlet joint 42; wherein, one end of the refrigerant inlet joint 41 is connected to the inlet of the refrigerant inlet pipeline, and the other end of the refrigerant inlet joint 41 is used for connecting to an external liquid supply device; one end of the refrigerant outlet joint 42 is connected to the outlet of the refrigerant outlet pipeline, and the other end of the refrigerant outlet joint 42 is used for connecting to an external refrigerant recovery and cooling pipeline.

[0067] In this way, the refrigerant circulation pipelines inside the lower box body frame 1 and the lower box body 3 and the liquid cooling pipes 5 in the plurality of battery modules 2 jointly form a refrigerant flow channel and are connected to the refrigerant inlet joint 41 and the refrigerant outlet joint 42 to jointly form a closed loop with an external liquid supply device and a refrigerant recovery and cooling pipeline. The refrigerant circulates in this closed loop to continuously cool or dissipate heat from each battery module 2.

[0068] When the first end of the liquid cooling pipe 5 is provided with a refrigerant inlet, the second end of the liquid cooling pipe 5 is provided with a refrigerant outlet, and the first end of the liquid cooling pipe 5 is connected to the outer frame body 11 and the second end of the liquid cooling pipe 5 is connected to the intermediate cross beam 12, the refrigerant inlet of the liquid cooling pipe 5 is connected to the refrigerant inflow pipe of the refrigerant circulation pipe in the outer frame body 11, and the refrigerant outlet of the liquid cooling pipe 5 is connected to the refrigerant outflow pipe of the refrigerant circulation pipe in the intermediate cross beam 12.

[0069] When the first end of the liquid cooling pipe 5 is provided with a refrigerant inlet, the second end of the liquid cooling pipe 5 is provided with a refrigerant outlet, and the first end of the liquid cooling pipe 5 is connected to the intermediate cross beam 12 and the second end of the liquid cooling pipe 5 is connected to the outer frame body 11, the refrigerant inlet of the liquid cooling pipe 5 is connected to the refrigerant inflow pipe of the refrigerant circulation pipe in the intermediate cross beam 12, and the refrigerant outlet of the liquid cooling pipe 5 is connected to the refrigerant outflow pipe of the refrigerant circulation pipe in the outer frame body 11.

[0070] When the first end of the liquid cooling pipe 5 is provided with a refrigerant inlet and a refrigerant outlet, the second end of the liquid cooling pipe 5 is closed, and the first end of the liquid cooling pipe 5 is connected to the outer frame body 11 and the second end of the liquid cooling pipe 5 is connected to the intermediate cross beam 12, the refrigerant inlet of the liquid cooling pipe 5 is connected to the refrigerant inflow pipe of the refrigerant circulation pipe in the outer frame body 11, and the refrigerant outlet of the liquid cooling pipe 5 is connected to the refrigerant outflow pipe of the refrigerant circulation pipe in the outer frame body 11.

[0071] When the first end of the liquid cooling pipe 5 is provided with a refrigerant inlet and a refrigerant outlet, the second end of the liquid cooling pipe 5 is closed, and the first end of the liquid cooling pipe 5 is connected to the intermediate cross beam 12 and the second end of the liquid cooling pipe 5 is connected to the outer frame body 11, the refrigerant inlet of the liquid cooling pipe 5 is connected to the refrigerant inflow pipe of the refrigerant circulation pipe in the intermediate cross beam 12, and the refrigerant outlet of the liquid cooling pipe 5 is connected to the refrigerant outflow pipe of the refrigerant circulation pipe in the intermediate cross beam 12.

[0072] When the first end of the liquid cooling pipe 5 is provided with a refrigerant inlet and a refrigerant outlet, the second end of the liquid cooling pipe 5 is also provided with a refrigerant inlet and a refrigerant outlet, and the first end of the liquid cooling pipe 5 is connected to the outer frame body 11 and the second end of the liquid cooling pipe 5 is connected to the intermediate cross beam 12, the refrigerant inlet and the refrigerant outlet at the first end of the liquid cooling pipe 5 are respectively connected to the refrigerant inflow pipe and the refrigerant outflow pipe of the refrigerant circulation pipe in the outer frame body 11, and the refrigerant inlet and the refrigerant outlet at the second end of the liquid cooling pipe 5 are respectively connected to the refrigerant inflow pipe and the refrigerant outflow pipe of the refrigerant circulation pipe in the intermediate cross beam 12.

[0073] When the first end of the liquid cooling pipe 5 is provided with a refrigerant inlet and a refrigerant outlet, the second end of the liquid cooling pipe 5 is also provided with a refrigerant inlet and a refrigerant outlet, and the first end of the liquid cooling pipe 5 is connected to the middle cross beam 12, and the second end of the liquid cooling pipe 5 is connected to the outer frame 11, the refrigerant inlet and the refrigerant outlet at the first end of the liquid cooling pipe 5 are respectively connected to the refrigerant inflow pipe and the refrigerant outflow pipe of the refrigerant circulation pipeline in the middle cross beam 12, and the refrigerant inlet and the refrigerant outlet at the second end of the liquid cooling pipe 5 are respectively connected to the refrigerant inflow pipe and the refrigerant outflow pipe of the refrigerant circulation pipeline in the outer frame 11.

[0074] The present invention provides a battery assembly design method for designing the above-mentioned battery module. The battery assembly design method includes: determining the limit area S of the battery cell fixing hole 201 according to the minimum allowable capacity CM of the battery cell 20 and the process limit dimension GC, S = CM * CC * GC * exp(A); where CC is a capacity-related structure coefficient, and the value range of CC is 0.8 to 0.95; A is a weight compensation parameter, and the value range of A is -0.85 to 0; determining the aperture D of the battery cell fixing hole 201 according to the limit area S of the battery cell fixing hole 201, D = S / GB * E * 2 / 3; where GB is the process length limit dimension; E is a safety dimension coefficient, and the value range of E is 1.03 to 1.53; performing a simulation calculation on the battery assembly according to the above various parameters to perform feedback correction when the simulation result is unqualified.

[0075] Specifically, when performing a simulation calculation on the battery assembly, a CAE software is used for the simulation calculation to obtain the structural strength, mode and frequency of the battery assembly under the above parameters, and strengthen the relevant structural design when the simulation result is unqualified.

[0076] The battery assembly design method of the present invention further includes: determining the thickness H of the partition 501 in the liquid cooling pipe 5 according to the limit area S of the battery cell fixing hole 201, H = S / A * 0.92. At the same time, the thickness H of the partition 501 here also needs to be added to the content of the simulation calculation of the above battery assembly.

[0077] In the battery assembly design method of the present invention, the minimum allowable capacity CM of the battery cell 20 refers to the minimum value of the electric quantity required to be stored in the battery cell 20, and its unit is "mAh", that is, milliampere-hour.

[0078] In the battery assembly design method of the present invention, the process limit dimension GC of the battery cell 20 refers to the minimum dimension that the battery cell 20 can be processed to on the premise of ensuring the minimum allowable capacity CM.

[0079] In the battery assembly design method of the present invention, the process length limit dimension GB refers to the maximum value of the center distance between two battery cell fixing holes 201 symmetrically arranged on the main body of the battery cell 20 with respect to the central plane.

[0080] The present invention also provides a vehicle, including the above-mentioned battery assembly.

[0081] The vehicle of the present invention can be a pure electric vehicle. A pure electric vehicle is a vehicle driven by an electric motor. The power battery of the pure electric vehicle includes the above-mentioned battery assembly. The power battery provides electrical energy for the electric motor, and the electric motor converts the electrical energy of the power battery into mechanical energy, which drives the wheels and working devices through a transmission device or directly. Its technology is relatively mature and simple, and it can be charged and used wherever there is a power supply.

[0082] The vehicle of the present invention can also be a hybrid vehicle. A hybrid vehicle refers to a vehicle that can obtain power from at least two of the following types of on-vehicle stored energy: one is consumable fuel, such as a gasoline or diesel engine; the other is rechargeable electrical energy / energy storage device, such as a power battery including the above-mentioned battery assembly.

[0083] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0084] The main body of the battery cell of the present invention is a rectangular parallelepiped, and the main body includes a first side surface, a second side surface, a third side surface, a fourth side surface, a fifth side surface and a sixth side surface which together form the outer peripheral surface of the main body of the battery cell. The first side surface and the second side surface are arranged opposite to each other and spaced apart along the height direction of the rectangular parallelepiped, the third side surface and the fourth side surface are arranged opposite to each other and spaced apart along the length direction of the rectangular parallelepiped, and the fifth side surface and the sixth side surface are arranged opposite to each other and spaced apart along the width direction of the rectangular parallelepiped; a battery cell positive electrode 204 and a battery cell negative electrode 205 are arranged on the main body of the battery cell, and the battery cell positive electrode 204 and the battery cell negative electrode 205 are both located on the first side surface of the main body, and the battery cell positive electrode 204 and the battery cell negative electrode 205 are respectively located on the first side surface close to the third side surface and the fourth ... One end of the battery cell positive electrode 204 and the battery cell negative electrode 205 is connected to the interior of the battery cell body, and the other end of the battery cell positive electrode 204 and the battery cell negative electrode 205 extends toward the outside of the battery cell body; the battery cell also includes: two battery cell fixing hole groups, the two battery cell fixing hole groups are both located on the main body and are symmetrically arranged about the center plane, each battery cell fixing hole group includes at least one battery cell fixing hole 201 arranged throughout the width direction of the rectangular parallelepiped, that is, the two ends of each battery cell fixing hole 201 are connected to the fifth side surface and the sixth side surface respectively, and each battery cell fixing hole 201 is used for the liquid cooling tube 5 to pass through; wherein, the center plane is located between the third side surface and the fourth side surface, the center plane is parallel to the third side surface and the fourth side surface, and the third side surface and the fourth side surface are symmetrically arranged about the center plane. Thus, when a plurality of battery cells of the present invention are used to form a battery module, the battery module can be fixed, cooled, and heated simply by providing a liquid cooling tube 5 running through the plurality of battery cells. This achieves a high degree of integration of the battery thermal management system and the battery assembly of the power battery having the battery module, achieves rapid cooling and rapid heating of the power battery, improves the overall energy utilization of the power battery, and solves the problem in the prior art of poor thermal management performance and low battery assembly integration efficiency due to the complex fixing structure and thermal management structure of the battery cells. In addition, the plurality of liquid cooling tubes 5 are respectively provided in the plurality of battery cell fixing holes 201 of the two battery cell fixing hole groups symmetrically arranged about the center plane, effectively reducing the inconsistency of the thermal performance inside the battery cell, achieving uniformity of the stress inside the battery cell, improving the safety of the battery cell, and ensuring the service life of the battery cell as much as possible.

[0085] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0086] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships.

[0087] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the specification. In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0088] In the description of the present application, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present application; the orientation terms "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0089] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" can be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures of the device.

[0090] For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used herein.

[0091] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, terms such as "installation", "provided with", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0092] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional declaration, the above terms have no special meanings, so it cannot be understood as a limitation on the protection scope of the present application.

[0093] The above-described embodiments only represent several implementation manners of the present invention, and the description is relatively specific and detailed. The present invention uses the above embodiments to illustrate the structure and method of the present invention in detail. However, the present invention is not limited to the above detailed methods, and it cannot be understood as a limitation on the scope of the invention patent, that is, it does not mean that the present invention must rely on the above detailed methods to be implemented.

[0094] It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative labor, including several deformations and improvements made, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery assembly, characterized in that, Comprising: A battery module (2), the battery module (2) including a plurality of battery cells (20); the main body of the battery cell (20) is a cuboid, and the main body includes a first side face and a second side face arranged at intervals along the height direction of the cuboid, a third side face and a fourth side face arranged at intervals along the length direction of the cuboid, and a fifth side face and a sixth side face arranged at intervals along the width direction of the cuboid; The battery cell (20) further includes: A battery cell positive electrode (204) and a battery cell negative electrode (205), arranged on the first side face of the main body and respectively close to the third side face and the fourth side face of the main body; Two battery cell fixing hole groups, both of the two battery cell fixing hole groups are arranged on the main body and are symmetrically arranged with respect to a central plane, and each battery cell fixing hole group includes at least one battery cell fixing hole (201) arranged through the width direction of the cuboid, and each battery cell fixing hole (201) is used for a liquid cooling pipe (5) to pass through; Wherein, the central plane is located between the third side face and the fourth side face, the central plane is parallel to both the third side face and the fourth side face, and the third side face and the fourth side face are symmetrically arranged with respect to the central plane; the plurality of battery cells (20) are arranged in sequence along a predetermined direction, and the battery cell fixing holes (201) of the plurality of battery cells (20) that are sequentially connected along the predetermined direction together form a mounting long hole; wherein, the predetermined direction is parallel to the width direction of the main body of the battery cell (20); The battery module (2) further includes a liquid cooling pipe (5), which is arranged in the mounting long hole to dissipate heat from the plurality of battery cells (20); The battery assembly further includes: A lower box body (3) and a lower box body frame (1) at least partially surrounding the lower box body (3) to jointly enclose a box space for accommodating the battery module (2), and a refrigerant circulation pipeline is arranged inside both the lower box body (3) and the lower box body frame (1), and the refrigerant circulation pipeline includes a refrigerant inflow pipeline and a refrigerant outflow pipeline; A refrigerant inflow joint (41) and a refrigerant outflow joint (42), arranged on the lower box body (3) or the lower box body frame (1) and respectively used for connecting with the inlet of the refrigerant inflow pipeline and the outlet of the refrigerant outflow pipeline; Wherein, both ends of the liquid cooling pipe (5) in the battery module (2) are fixedly connected to the lower box body frame (1), the inlet of the liquid cooling pipe (5) is used for connecting with the outlet of the refrigerant inflow pipeline, and the outlet of the liquid cooling pipe (5) is connected to the inlet of the refrigerant outflow pipeline.

2. The battery assembly according to claim 1, wherein, The battery cell fixing hole (201) is a round hole.

3. The battery assembly according to claim 2, wherein The diameter of the battery cell fixing hole (201) ranges from 10 mm to 20 mm; and / or The minimum distance between the center line of the battery cell fixing hole (201) and the third side face or the fourth side face is 8 mm.

4. The battery assembly according to claim 1, characterized in that, The battery cell (20) includes: A plurality of cell fins (202), the plurality of cell fins (202) being fixed in the cell fixing holes (201) and arranged at intervals along the length direction of the cell fixing holes (201) for contacting with a liquid cooling pipe (5) inserted in the cell fixing holes (201).

5. The battery assembly according to claim 1, wherein, The liquid cooling pipe (5) includes a pipe body (500) and at least one partition (501) provided inside the pipe body (500) to divide the interior of the pipe body (500) into a plurality of cavities (502).

6. A battery assembly design method, characterized in that, For designing the battery assembly according to any one of claims 1 to 5, the battery assembly design method includes: Determining the limit area S of the cell fixing hole (201) according to the minimum allowable capacity CM of the cell (20) and the process limit dimension GC, S = CM * CC * GC * exp(A); where CC is a capacity-related structure coefficient, and the value range of CC is 0.8 to 0.95; A is a weight compensation parameter, and the value range of A is -0.85 to 0; Determining the aperture D of the cell fixing hole (201) according to the limit area S of the cell fixing hole (201), D = S / (GB * E) * 2 / 3; where GB is the process length limit dimension; E is a safety dimension coefficient, and the value range of E is 1.03 to 1.53; Performing a simulation calculation on the above battery assembly according to the above various parameters to perform feedback correction when the simulation result is unqualified.

7. The battery assembly design method according to claim 6, wherein Determining the thickness H of the partition (501) in the liquid cooling pipe (5) according to the limit area S of the cell fixing hole (201), H = S / A * 0.

92.

8. A vehicle, characterized in that, Including the battery assembly according to any one of claims 1 to 5.

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