Battery pack, vehicle and energy storage device

Abstract

To provide a battery pack having advantages such as high space utilization rate, large energy density, long range capability, and low cost. [Solution] The present invention relates to a battery pack, a vehicle, and an energy storage device, the battery pack including a battery array and a support member, the battery array including a plurality of unit cells, the unit cells having a first dimension that is the maximum pitch between two parallel planes that virtually sandwich the unit cells, and at least one unit cell satisfying the condition 600 mm≦first dimension≦2500 mm. The battery pack includes a case and a pole core located within the case, a support area is formed in the case, and the unit cells are supported by the support member by contacting the support area. The support member supports the unit cells by contacting the support area.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority to Chinese Patent Application Nos. "201910021244.0", "201910020967.9", "201910021246.X", "201910021248.9", "201910021247.4" and "201910020925.5", filed on January 9, 2019 by BD Company Limited, the entire contents of which are incorporated herein by reference.

[0002] The present application is in the technical field of vehicle manufacturing, and more particularly, relates to a battery pack, a vehicle having the battery pack, and an energy storage device having the battery pack. [Background technology]

[0003] In the prior art, for example, a battery pack applied to an electric vehicle mainly includes a pack body and a plurality of battery modules attached within the battery pack, each of which is made up of a plurality of unit cells.

[0004] As users' requirements for the driving range of electric vehicles gradually increase, if the space under the vehicle body is limited, the use of power battery packs in the prior art will result in low utilization of the internal space and the energy density of the power battery pack will not meet the demand, which has also become an important factor restricting the development of electric vehicles. Summary of the Invention

[0005] In the prior art, as shown in FIG. 1 , a battery pack includes a battery pack case, with multiple horizontal beams 500 and multiple vertical beams 600 dividing the battery pack case into mounting areas for multiple battery modules 400. The battery modules 400 are fixed to the horizontal beams 500 or the vertical beams 600 with screws or the like. The battery module 400 includes multiple cells arranged in sequence to form a battery array. End plates and / or side plates are provided on the exterior of the battery array, and typically include both end plates and side plates, which are fixed together to enclose a space that accommodates the battery array. Furthermore, the end plates and side plates may be connected by screws, welding, or other connecting members such as tie rods to secure the battery array.

[0006] Because the battery module 400 is fixed to the horizontal beams 500 or the vertical beams 600 by structures such as screws, space is wasted, and the increased number of connecting members such as screws increases the weight and reduces the energy density. Furthermore, because the battery module 400 is designed with an end plate and a side plate combination, each of the end plate and the side plate has a certain thickness and height, space inside the battery pack is wasted and the volume utilization rate of the battery pack is low. Generally, in the battery packs of the above-mentioned prior art, the ratio of the sum of the volumes of the cells in the battery pack to the volume of the battery pack is about 50%, and even as low as 40%.

[0007] In the battery pack according to the above-mentioned prior art embodiment, the end plates, side plates, and internal connection and mounting configuration of the battery module 400 all reduce the utilization rate of the internal space of the battery pack, resulting in a battery pack with a too low ratio of the sum of the cell volumes to the battery pack volume, making its energy density unable to meet the growing demand, which has become a major factor restricting the development of electric vehicles. Furthermore, the assembly process is complicated, requiring battery modules to be assembled first and then installed into the battery pack, which increases labor and material costs. Furthermore, the need for multiple assembly steps increases the probability of defective products during the battery pack assembly process. Multiple assembly steps increase the possibility of loosening the battery pack and making it less securely installed, which adversely affects the quality of the power battery pack and reduces the stability and reliability of the battery pack. [Problem to be solved by the invention]

[0008] The present application aims to solve at least one of the technical problems in the prior art. Therefore, one objective of the present disclosure is to provide a battery pack having advantages such as high space utilization, high energy density, long range, and low cost. [Means for solving the problem]

[0009] In order to achieve the above object, the battery pack of the present application includes a battery array and a support member, the battery array includes a plurality of unit cells, the unit cells have a first dimension that is the maximum value of the pitch between two parallel planes that virtually sandwich the unit cells, at least one unit cell satisfies the condition 600 mm≦first dimension≦2500 mm, and includes a case and a pole core located within the case, a support area is formed in the case, and the unit cells abut against the support member by the support area and are supported by the support member.

[0010] The battery pack according to the present application includes a battery array and a support member, the battery array including a plurality of unit cells, the unit cells having a dimension A that is the length of the smallest circumscribed rectangular parallelepiped of the unit cells, at least one unit cell satisfying the condition 600 mm≦dimension A≦2500 mm, and including a case and a pole core located within the case, a support area formed in the case, and the unit cells abut against the support member by the support area and are supported by the support member.

[0011] The battery pack according to the present application includes a battery array and a support member, the battery array including a plurality of single cells, at least one of which includes a battery body and an electrode terminal extending from the battery body and drawing out an internal current of the battery body, the battery body being a substantially rectangular parallelepiped, the length of the battery body being L and satisfying the condition that 600 mm≦L≦2500 mm, and further including a case and a pole core located within the case, a support region being formed in the case, and the single cells abutting against the support member by the support region and being supported by the support member. [Effects of the Invention]

[0012] According to the above technical solution, by limiting the arrangement and size of the cells in the battery pack, more cells can be accommodated in the battery pack. Since the cells are supported by the support members by contacting the support members through the support regions, the use of horizontal and / or vertical beams in the battery pack can be reduced. Furthermore, the use of horizontal and / or vertical beams in the battery pack can be eliminated. As a result, the space occupied by the horizontal and / or vertical beams in the battery pack is reduced, the space utilization rate of the battery pack is improved, and as many batteries as possible can be accommodated in the battery pack, making the battery pack safer and more reliable. This ultimately improves the overall capacity, voltage, and driving range of the battery pack. For example, in an electric vehicle, this design can increase the space utilization rate from the conventional 40% to over 60%, or even higher, such as 80%.

[0013] Furthermore, since there is no need to arrange horizontal and / or vertical beams in the battery pack, the manufacturing process of the battery pack is simplified, the complexity of assembling the cells is reduced, and production costs are reduced, while the weight of the battery pack and the entire battery pack is reduced, resulting in a lighter battery pack. In particular, when the battery pack is installed in an electric vehicle, the driving range of the electric vehicle can be improved and the weight of the electric vehicle can be reduced.

[0014] Furthermore, compared with the unit cells in the prior art, the unit cells defined in the present disclosure are hard-case batteries, and the dimensions of the provided unit cells are long, so that the unit cells themselves can function as horizontal or vertical beams that reinforce the structural strength of the battery pack; that is, there is no need to provide an additional reinforcing structure in the battery pack to reinforce its structural strength; the unit cells can be supported by a support member; that is, instead of a reinforcing structure, the structural strength of the battery pack can be ensured by the unit cells themselves, and it can be ensured that the battery pack is less likely to deform under the action of external forces.

[0015] A vehicle according to the present application includes the battery pack.

[0016] The energy storage device according to the present application includes the battery pack.

[0017] The advantages of the vehicle and the energy storage device are similar to those of the battery pack described above over the prior art, and therefore will not be described here.

[0018] Additional aspects and advantages of the present application will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the present application. [Brief explanation of the drawings]

[0019] The above and / or additional aspects and advantages of the present application will become more apparent and easier to understand by the following detailed description of the embodiments with reference to the drawings. [Figure 1] FIG. 1 is an exploded view of a battery pack according to the prior art. [Figure 2]1 is a perspective view of a battery pack according to an embodiment of the present application; [Figure 3] 1 is a perspective view of a cell according to an embodiment of the present application; [Figure 4] 1 is a schematic diagram illustrating an arrangement of a plurality of unit cells in a battery pack according to an embodiment of the present application. [Figure 5] 1 is a perspective view of a battery pack according to an embodiment of the present application; [Figure 6] FIG. 10 is a perspective view of a battery pack according to another embodiment of the present application. [Figure 7] FIG. 10 is a perspective view of a battery pack according to still another embodiment of the present application. [Figure 8] FIG. 8 is an enlarged view of part A in FIG. [Figure 9] 1 is a cross-sectional perspective view of a battery pack according to an embodiment of the present application; [Figure 10] FIG. 10 is an enlarged view of part B in FIG. [Figure 11] 10 is a cross-sectional view of a battery pack according to another embodiment of the present application, in which the first side beam and the second side beam are not shown. [Figure 12] FIG. 1 is an exploded view of a battery pack according to an embodiment of the present application. [Figure 13] FIG. 2 is a perspective view of a first side plate or a second side plate according to an embodiment of the present application. [Figure 14] 1 is a perspective view of a first end plate or a second end plate according to one embodiment of the present application. FIG. [Figure 15] 1 is a perspective view of a battery pack according to an embodiment of the present application, including a plurality of battery modules; [Figure 16] 1 is a perspective view of a battery pack (chamber) according to an embodiment of the present invention when formed in an electric vehicle. [Figure 17] 1 is a cross-sectional view of a chamber according to an embodiment of the present application; [Figure 18] 1 is a perspective view illustrating a vehicle tray according to an embodiment of the present application when the vehicle tray is fixed to an electric vehicle; [Figure 19]1 is an exploded assembly view of a battery pack (vehicle tray) according to an embodiment of the present application when fixed to an electric vehicle. [Figure 20] 1 is a perspective view of a battery pack according to an embodiment of the present application; [Figure 21] FIG. 10 is a perspective view of a battery pack according to yet another embodiment of the present application. [Figure 22] FIG. 10 is a perspective view of a battery pack according to yet another embodiment of the present application. [Figure 23] FIG. 10 is a perspective view of a battery pack according to yet another embodiment of the present application. [Figure 24] FIG. 10 is a perspective view of a battery pack according to yet another embodiment of the present application. [Figure 25] FIG. 1 is a perspective view of a bottom beam according to an embodiment of the present application. [Figure 26] 1 is a schematic configuration diagram of a vehicle according to an embodiment of the present application; [Figure 27] 1 is a schematic diagram of an energy storage device according to an embodiment of the present application; [Figure 28] FIG. 2 is a diagram illustrating the principle of measuring a first dimension and a second dimension according to the present application. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, the embodiments of the present application will be described in detail. Examples of the embodiments are shown in the drawings, and the same or similar reference numerals throughout indicate the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the drawings are merely illustrative and are intended to interpret the present application, but should not be understood as limiting the present application.

[0021] As shown in FIGS. 2 to 25, a battery pack 200 according to one embodiment of the present invention includes a battery array 3 and a support member 4. The battery array 3 and support member 4 are made of a polycrystalline silicon.

[0022] The battery array 3 includes a plurality of cells 100, and the cells 100 have a first dimension that is the maximum value of the pitch between two parallel planes that virtually sandwich the cells 100. At least one cell 100 satisfies the condition 600 mm≦first dimension≦2500 mm.

[0023] The two parallel planes that virtually sandwich the cell 100 are merely introduced to facilitate understanding of the first dimension and do not actually exist in the solution of the present application. For example, the cell 100 has a regular or irregular outer periphery, and in order to determine the first dimension, it can be assumed that there are multiple sets of planes, each set including two parallel planes spaced apart, and that the two parallel planes of each set can virtually sandwich two opposing sides of the cell 100. In this case, there is a distance between the two parallel planes of each set, and the first dimension is the maximum value of these distances.

[0024] As shown in Figure 28, the definition of the first dimension can refer to the Feret diameter, which is the dimension of an object measured along a certain direction. Generally, the measurement method is defined as measuring the distance between two parallel planes that sandwich the object and must be perpendicular to the specified direction.

[0025] The shape of the cell 100 may vary and may be a regular geometric shape, an irregular geometric shape, such as a rectangular, circular, polygonal, triangular, or any other shape such as an irregular shaped cell, and it is understood that the present application is not limited to the shape of the cell.

[0026] When the cell 100 is a non-circular battery, the first dimension can be understood as follows: When there are multiple pairs of two parallel planes that contact the contour edge of the cell 100, and the pitch of one pair of the two parallel planes is larger than the pitch of the other pairs of the two parallel planes, the maximum pitch can be defined as the first dimension.

[0027] The unit cell 100 includes a case and a pole core located inside the case, and a support area is formed in the case. The unit cell 100 abuts against the support member by the support area and is supported by the support member.

[0028] Compared with the prior art, the battery pack 200 according to the present application has at least the following improvements.

[0029] 1) Significant reduction in battery pack costs: Since the cells themselves have a supporting function, the reinforcing ribs on the battery tray can be omitted or reduced, simplifying the battery pack manufacturing process and reducing manufacturing costs. Furthermore, the dimensions of the cells in the present application are matched to the dimensions of the battery pack, so the cells can be directly arranged side by side in the battery pack, rather than the need to first arrange multiple cells side by side in a module frame surrounded by two end plates and two side plates and then assemble the battery module into a battery pack as in the prior art. The cells in the present application are sufficiently long, so multiple cells can be directly arranged side by side in the battery pack, eliminating or reducing the need for end plates, side plates, and a large number of fasteners such as screws for assembling the battery module. This makes the cell assembly process simpler and saves a lot of manufacturing costs such as labor and materials. Low-cost battery packs are beneficial to the promotion of new energy vehicles.

[0030] 2) Significantly improving the volumetric utilization rate of the battery pack and improving the volumetric energy density of the battery pack: As described above, the support function of the cells themselves can reduce the use of auxiliary support members and fixing members, allowing a battery pack of the same volume to accommodate more cells, thereby improving the volumetric utilization rate and energy density of the battery pack. Because the reserved installation space for the battery pack in a vehicle is limited, the battery pack of the present application can effectively improve the vehicle's driving range.

[0031] 3) Improved stability and reliability of battery packs: The more complex the battery pack assembly process, the higher the probability of defective products, and the greater the possibility of the battery pack becoming loose or not firmly attached, which adversely affects the quality of the battery pack and reduces the stability and reliability of the battery pack.Assembling the cells of the present application into a battery pack simplifies the assembly process, thereby improving the stability and reliability of the battery pack and reducing the defect rate of the battery pack.

[0032] Based on the significant technical advantages of the long cell length, improvements can be made to the molding process, structural design, and other aspects to improve the support strength of the case and control the aspect ratio of the case within a predetermined range in order to support the cell itself. Furthermore, optimization of the current collection path can reduce the internal resistance of the cell. Furthermore, improvements to the electrolyte injection process can solve the problem of long electrolyte injection times caused by the long dimensions of the cell.

[0033] The case includes a case body and a cover plate that seals the case body, and the case body is an aluminum case or a steel case.

[0034] The case body may be a polyhedron having an opening, and the cover plate accordingly seals the opening. In a specific implementation, the number of the openings may be one or more, and the number of the cover plates may be one or more.

[0035] The support area may be a partial area of ​​the outer surface of either the case body or the cover plate, or any combination of the outer surface of the case body, the outer surface of the cover plate, a partial area of ​​the outer surface of the case body, and a partial area of ​​the outer surface of the cover plate, as long as the support area is capable of contacting the support member 4.

[0036] In actual implementation, the support areas may be provided at both ends of the cell 100 along the first dimension, and in this way the cell 100 can be supported on the support member 4 along the first dimension.

[0037] The inventors of the present application have found that when the first dimension of the battery cell 100 is designed to be 600 mm to 2500 mm, the battery cell 100 is long enough to be directly supported by the support member 4, and by forming a plurality of battery cells 100 into a module and then supporting the module, the battery cell 100 itself performs the supporting function, and the structural strength of the battery pack 200 can be ensured instead of a reinforcing structure. In this way, the use of the horizontal beams 500 and / or vertical beams 600 in the battery pack 200 can be reduced, and further, the horizontal beams 500 and / or vertical beams 600 do not need to be used in the battery pack 200. As a result, the space occupied by the horizontal beams 500 and / or vertical beams 600 in the battery pack 200 can be reduced, the space utilization rate of the battery pack 200 can be improved, and as many battery cells 100 as possible can be arranged in the battery pack 200, which ultimately improves the capacity, voltage, and driving range of the entire battery pack. For example, in an electric vehicle, this design can improve the space utilization rate from the conventional level of about 40% to 60% or more, or even higher, such as 80%. The inventors of the present application have found through multiple experiments that if the cells 100 are designed as pouch batteries, i.e., if the cell casings are made of aluminum laminate film and the aluminum laminate film is used to support the cells, there is a risk of wear on the aluminum laminate film of the cells, and the pouch cells are likely to shift within the battery pack, further accelerating wear on the cells. Wear on the aluminum laminate film can lead to failure of the cells 100 and reduce the driving range of the battery pack. Furthermore, due to the poor heat dissipation performance of the pouch cells, even after the pouch cells are designed to the dimensions described herein and arranged in the battery pack, the heat dissipation performance of the entire battery pack will be relatively poor. Therefore, in the present application, the cell 100 includes a case, a cover plate, and a pole core located in the space formed by the case and the cover plate; in other words, the cell is a hard-case battery, and when the first dimension of the cell is 600 mm to 2500 mm, a support area is formed in the case and / or the cover plate, and the support member 4 abuts against the support area to support the cell.Here, the support member 4 abutting against the support area may mean that the support member 4 is in direct contact with the support area, or that the support member 4 is in indirect contact with or connected to the support area via another member, which can be set depending on the usage situation, and the present application does not limit this.

[0038] Furthermore, since there is no need to arrange horizontal beams and / or vertical beams in the battery pack 200, the manufacturing process of the battery pack 200 is simplified, the complexity of assembling the cells 100 is reduced, and production costs are reduced, while the weight of the battery pack 200 is reduced, realizing a lightweight battery pack. In particular, when the battery pack is installed in an electric vehicle, the driving range of the electric vehicle can be improved and the weight of the electric vehicle can be reduced.

[0039] The first dimension satisfies 600 mm≦first dimension≦1500 mm, and preferably 600 mm≦first dimension≦1000 mm. A cell 100 having this length is long enough to be supported by the support member 4, but not too long, and when used in a battery pack 200, the rigidity of the cell 100 itself is also sufficiently large.

[0040] The present application does not particularly limit the specific form of the battery pack, but only limits that the battery pack includes a support member 4, the battery array 3 is positioned on the support member 4, and the cells 100 are supported by the support member 4. The present application does not limit the specific structure of the support member 4, but only limits that the cells 100 can be supported by the support member 4, and the specific structure of the support member 4 will be described later. The cells 100 are supported by the support member 4, and the cells 100 are directly supported by the support member 4; that is, they may be placed on the support member 4 or fixed to the support member 4, and specific fixing modes will be described later, but the present application does not limit the specific supporting and fixing modes.

[0041] The support member 4 is for supporting the battery array 3, and is generally a rigid structure. To facilitate attachment to the entire vehicle or other devices, the support member 4 may be an independently processed tray or a rigid support structure molded into the chassis of the vehicle.

[0042] The battery 100 can support itself only by contacting the local support area with the support member 4. However, in some applications, for example, when the support member 4 is a car chassis, the entire side of the battery 100 where the support area is located may come into contact with the car chassis. In this case, the idea of ​​the present invention can be realized by adopting a design such as locally strengthening the area of ​​the car chassis corresponding to the support area, and accordingly, the area of ​​the car chassis corresponding to the non-support area of ​​the battery 100 may be weakened or even partially removed.

[0043] When the case of the cell 100 is made of a metal material, the thermal conductivity of the metal case of the cell 100 is further improved, improving the heat dissipation efficiency of the cell 100 and optimizing the heat dissipation effect.

[0044] In some embodiments, the cell 100 has a second dimension that is the minimum value of the pitch between two parallel planes that virtually sandwich the cell, the normal direction of the two parallel planes corresponding to the second dimension is the P direction, and the multiple cells are arranged along the P direction of at least one cell.

[0045] For a given battery 100, there are multiple sets of parallel planes, each set of parallel planes includes two parallel planes, and each of the two parallel planes in each set can virtually sandwich the battery 100 between them, and there is a distance between the two parallel planes in each set, and the second dimension is the smallest value of these distances.

[0046] As shown in Figure 28, the definition of the second dimension can refer to the Feret diameter, which is the dimension of an object measured along a certain direction. Generally, the measurement method is defined as measuring the distance between two parallel planes that sandwich the object and must be perpendicular to the specified direction.

[0047] When the cell 100 is a non-circular battery, the second dimension can be understood as follows: When there are multiple pairs of two parallel planes that contact the contour edge of the cell 100, and the pitch of one pair of the two parallel planes is smaller than the pitch of the other pairs of the two parallel planes, the minimum pitch can be defined as the second dimension.

[0048] The normal direction of the two parallel planes corresponding to the second dimension is the P direction, and the plurality of unit cells are arranged along the P direction of any one of the unit cells in the battery array 3.

[0049] At least one cell satisfies the condition 23≦first dimension / second dimension≦208, and in the examples of the present application, the condition 50≦first dimension / second dimension≦70. Through extensive testing, the inventors have found that when a cell 100 that satisfies the above-mentioned dimensional requirements while satisfying the rigidity support requirements is thinned in the direction of the second dimension, the cell 100 itself has high heat dissipation capability.

[0050] In some embodiments, the volume of the cells 100 is V, and the cell body of at least one cell 100 is 0.0005 mm -2 ≦L / V≦0.002mm -2 Meet the conditions. The volume V of the cell can be determined by the drainage method, i.e., placing the cell in a container filled with water, and the volume of the water spilling out of the container is equal to the volume of the cell. Through extensive testing, the inventors have found that if the cell 100 satisfies the above limitations, the cross section of the cell 100 is small, the heat dissipation effect is high, and thus the temperature difference between the inside and the surroundings of the cell 100 is small.

[0051] In another embodiment of the present application, the ratio of the surface area S to the volume V of the battery body of the single cell 100 is 0.1 mm -1 ≦S / V≦0.35mm -1 This ratio can be achieved by using the cell 100 having a long length and a thin thickness, or by adjusting the dimensions. By controlling the ratio of the surface area S to the volume V of the cell 100, the length of the cell 100 can be extended along the Y direction, and it can be ensured that the cell 100 has a sufficient heat dissipation area, thereby ensuring the heat dissipation effect of the cell 100.

[0052] The surface area of ​​the cell means the sum of the areas of all the surfaces of the cell.

[0053] In an embodiment of the present application, at least one single cell 100 has a first end and a second end along a first dimension direction, and at least one of the first end and the second end has an electrode terminal that draws out an internal current of the single cell 100, and the electrode terminals between the single cells 100 are electrically connected by a connecting member.

[0054] Here, the "first end" and "second end" of the cell 100 are used to describe the directions of the cell 100 and are not intended to limit the specific structure of the cell 100. For example, the first end and the second end are not intended to limit the positive and negative electrodes of the cell 100. In one embodiment, as shown in FIGS. 2 to 4 , a first electrode terminal 101 of the cell 100 is drawn out from the first end of the cell 100, and a second electrode terminal 102 of the cell 100 is drawn out from the second end of the cell 100. In other words, the first dimensional direction of the cell 100 may be the direction of current flow inside the cell 100; that is, the direction of current flow inside the cell 100 is the first dimensional direction. In this way, since the current direction is the same as the first dimensional direction of the cell 100, the effective heat dissipation area of ​​the cell 100 is further increased, resulting in higher heat dissipation efficiency. Here, the first electrode terminal 101 is the positive electrode of the cell 100, and the second electrode terminal 102 is the negative electrode of the cell 100, or alternatively, the first electrode terminal 101 is the negative electrode of the cell 100, and the second electrode terminal 102 is the positive electrode of the cell 100. The electrode terminals of the cell 100 are connected in series and parallel by a connecting member.

[0055] The battery pack further includes two side plate members disposed opposite each other on both sides of the battery array 3 and sandwiching the battery array 3. The side plate members sandwich the battery array 3 and have the function of limiting the expansion and deformation of the plurality of cells 100, thereby ensuring activation of the explosion-proof valve 103 and the current interruption device (CID). Specifically, in some embodiments, the side plate members may be a third side beam 203 and a fourth side beam 204 as shown in FIG. 4, and in other embodiments, the side plate members may be a first side plate 209 and a second side plate 210 as shown in FIG. 12.

[0056] In some embodiments, as shown in Figures 3 and 20 to 24, the normal direction of two parallel planes corresponding to the first dimension is the Q direction, the battery pack includes a vehicle tray including a first side beam 201 and a second side beam 202 arranged opposite each other along the Q direction, the support member 4 is the first side beam 201 and the second side beam 202, and both ends of the single battery 100 are supported by the first side beam 201 and the second side beam 202, respectively.

[0057] In another embodiment, the support member 4 is a plurality of bottom beams, which are located below the battery array 3. The bottom beams are for supporting the battery array 3, and the upper surfaces of the bottom beams may be flat so as to be supported on the surface of the battery array 3. In actual implementation, the bottom beams have a rectangular cross section. There may be a plurality of bottom beams, and the plurality of bottom beams may be arranged parallel to each other and spaced apart, or may be arranged crosswise. The battery array 3 may be fixed to the bottom beams by adhesive, screw connection members, or other methods. The battery pack further includes a sealing cover that, together with the bottom beams, forms an accommodation chamber for accommodating the battery array 3. The sealing cover is for preventing the intrusion of dust, water, and the like.

[0058] As shown in FIG. 25 , the normal direction of the two parallel planes corresponding to the first dimension is the Q direction, the bottom beam includes a first beam 501 and a second beam 502 located on the first beam 501 and intersecting the first beam 501, the angle between the extension direction of the first beam 501 and the Q direction is 60 to 90 degrees, and the battery 100 is supported by the first beam 501. In the example shown in FIG. 25 , the first beam 501 and the second beam 502 are connected perpendicularly, and the connection between the first beam 501 and the second beam 502 includes, but is not limited to, connection using a screw connection member, welding, etc. Both the first beam 501 and the second beam 502 may be straight beams.

[0059] In actual implementation, there are two second beams 502, each located at both ends of the first beam 501 and perpendicular to the first beam 501, and the cell 100 is supported by the first beam 501. The second beams 502 protrude upward (in the Z direction) relative to the first beam 501. For example, the lower surface of the second beam 502 may be connected to the upper surface of the first beam 501. When the cells 100 are arranged, the two second beams 502 may abut against each of the two outermost cells 100 so that they face each other's sides. The center of the cell 100 is located on the first beam 501, and the longitudinal direction of the cell 100 is perpendicular to the longitudinal direction of the first beam 501. By aligning the center of the cell 100 with the first beam 501, it is possible to support the cell 100 with a single beam. Of course, in other embodiments, there may be a plurality of first beams 501, and the plurality of first beams 501 are spaced apart and parallel along the second direction.

[0060] In another embodiment, the normal direction of the two parallel planes corresponding to the first dimension is the Q direction, the bottom beam may be a plurality of rectangular beams arranged in parallel and spaced apart, the angle between the extension direction of the rectangular beams and the Q direction is 60 to 90 degrees, and the unit cells 100 are supported by the rectangular beams. The rectangular beams may be uniformly arranged along the Q direction, the extension direction of the rectangular beams is perpendicular to the Y direction, and the unit cells 100 are located on the uniformly arranged rectangular beams.

[0061] It should be understood that the shape of the bottom beam includes, but is not limited to, a straight line or a rectangle, and may also be a triangle, a trapezoid, or other irregular shape. In another embodiment according to the present application, as shown in Fig. 16, the support member 4 is a chassis of an automobile, the battery array 3 is located on the chassis of the automobile, and the battery pack 200 may be directly formed on the electric vehicle, i.e., the battery pack 200 is formed at any suitable position on the electric vehicle and is a device for mounting the cells 100. For example, the battery pack 200 may be formed on the chassis of the electric vehicle.

[0062] In some embodiments, the automobile chassis is provided with a downwardly recessed chamber 300 to facilitate assembly of the cell 100 .

[0063] In a specific embodiment of the present application, the chamber 300 may include a first side wall 301 and a second side wall 302 provided opposite each other, and the first side wall 301 may extend downward from the chassis of the electric vehicle to form an extension portion of the first side wall 301, and the first side wall 301 may extend downward from the chassis of the electric vehicle to form an extension portion of the second side wall 302. Thus, in one embodiment, a first end of the cell 100 may be supported by the extension portion of the first side wall 301, and a second end of the cell 100 may be supported by the extension portion of the second side wall 302. That is, the present application further provides an electric vehicle in which the cells 100 can be arranged according to the above technical means, and the chamber 300 having features similar to those of a single vehicle tray is formed in the electric vehicle to form the battery pack 200 of the present application.

[0064] 2, the normal direction of the two parallel planes corresponding to the first dimension is the Q direction, the battery pack 200 forms a battery mounting area, the battery array 3 is located in the battery mounting area, the battery pack 200 includes one battery array 3, and the battery cells 100 extend from one side of the battery mounting area to the other side of the battery mounting area along the Q direction. The battery pack accommodates only one battery cell in the Q direction.

[0065] In some embodiments, the cell has a second dimension that is the minimum value of the pitch between two parallel planes that virtually sandwich the cell, and the normal direction of the two parallel planes corresponding to the second dimension is the P direction. A battery mounting area is formed in the battery pack 200, and the battery array 3 is located in the battery mounting area. N (N is 1 or more) battery arrays 3 are provided along the P direction and M (M is 1 or more) battery arrays 3 are provided along the Q direction in the battery mounting area. The battery arrays 3 are electrically connected to each other by connecting members between the electrode terminals of the cells. The electrode terminal of the last cell in the (N-1)th (N is 1 or more) battery array 3 is connected to the electrode terminal of the first cell in the Nth battery array 3 by a connecting member. In other words, a battery pack may have multiple battery arrays 3 provided along the arrangement direction of the cells 100, i.e., multiple rows of battery arrays 3 are provided in the battery pack 200.

[0066] 21, the first separator 700 divides the illustrated battery array 3 into two battery arrays 3 along the P direction of the battery pack 200. The last cell 100 in the front battery array 3 and the first cell in the rear battery array 3 are connected by a connecting member.

[0067] According to the battery pack 200 of the present application, a battery mounting area is formed within the battery pack, and the battery array 3 is located in the battery mounting area. M (M is 1 or more) battery arrays 3 are provided in the battery mounting area along the Q direction, and the battery arrays 3 are electrically connected to each other by connecting members between the electrode terminals of the cells. The electrode terminal of the last cell in the (M-1)th (M is 1 or more) battery array 3 is connected to the electrode terminal of the first cell in the Mth battery array 3 by a connecting member. In other words, a plurality of cells 100 may be housed in the direction in which the cells 100 extend, i.e., a plurality of rows of battery arrays 3 are provided within the battery pack 200.

[0068] 20, the second separator 800 divides the battery array 3 into two battery arrays 3 along the Q direction of the battery pack 200. The last cell 100 in the front battery array 3 and the first cell in the rear battery array 3 are connected by a connecting member.

[0069] According to the battery pack 200 of the present application, a battery mounting area is formed within the battery pack, and the battery array 3 is located in the battery mounting area, and N (N is 1 or more) battery arrays 3 are provided along the P direction and M (M is 1 or more) battery arrays 3 are provided along the Q direction in the battery mounting area, and the battery arrays 3 are electrically connected to each other by connection members between the electrode terminals of the unit cells. In other words, the battery mounting area is divided into multiple sub-battery mounting areas in the P direction of the battery pack, and multiple unit cells 100 may be housed in the Q direction, in which the unit cells 100 extend; that is, multiple rows and multiple columns of battery arrays 3 are provided within the battery pack 200.

[0070] 22, a first separator 700 and a second separator 800 are provided in a battery pack 200, and the first separator 700 and the second separator 800 divide a plurality of unit cells into two rows and two columns of battery arrays 3. Any two battery arrays 3 are connected by a connecting member between the electrode terminals.

[0071] In the above description, the first separator 700 and the second separator 800 may be reinforcing ribs or other structural members such as insulating cotton, and the present application is not limited thereto.

[0072] The present application does not particularly limit the number of cells 100 in the battery array 3, and different numbers of cells 100 can be arranged depending on different vehicle models and different required power. In some specific examples of the present application, the number of cells in the battery array 3 is 60 to 200, and in other specific examples of the present application, the number of cells in the battery array 3 is 80 to 150.

[0073] The number of cells 100 in the battery array according to the present application is not limited and may be, for example, 2. The battery pack according to the present application may include one battery array as described above, or may include multiple battery arrays, each of which may be the same or different, and the battery pack may include, in addition to the battery array, other types of cells, for example, small batteries provided according to the internal space of the battery pack, and the specific placement of these cells is not limited to the battery array according to the present invention.

[0074] As shown in FIGS. 2 to 25, a battery pack 200 according to another embodiment of the present invention includes a battery array 3 and a support member 4. The battery array 3 and the support member 4 are electrically connected to each other.

[0075] The battery array 3 includes a plurality of cells 100, and the cells 100 have a dimension A that is the length of the smallest circumscribing rectangular parallelepiped of the cells 100. At least one cell 100 satisfies the condition 600 mm≦dimension A≦2500 mm.

[0076] The minimum circumscribing rectangular parallelepiped is introduced merely to facilitate understanding of the dimension A, and does not actually exist in the solution of the present application.

[0077] Specifically, the minimum circumscribing rectangular parallelepiped can be understood as follows. Assuming that there is one rectangular parallelepiped case for the cell 100, and that the inner walls of all six sides of this rectangular parallelepiped case simultaneously abut against the outer shell of the cell, the rectangular parallelepiped case is the minimum circumscribing rectangular parallelepiped. The dimension A is the length of the minimum circumscribing rectangular parallelepiped. Naturally, for a rectangular parallelepiped, the length > height > width.

[0078] The shape of the cell 100 may vary and may be a regular geometric shape, an irregular geometric shape, such as a rectangular, circular, polygonal, triangular, or any other shape such as an irregular shaped cell, and it is understood that the present application is not limited to the shape of the cell.

[0079] The cell 100 includes a case and a pole core located inside the case, a support area is formed in the case, and the support member 4 abuts against the support area to support the cell 100. The case includes a case body and a cover plate that seals the case body, and the case body is an aluminum case or a steel case.

[0080] The support area may be the outer surface of either the case body or the cover plate, a partial area of ​​the outer surface of either the case body or the cover plate, or any combination of the outer surface of the case body, the outer surface of the cover plate, a partial area of ​​the outer surface of the case body, and a partial area of ​​the outer surface of the cover plate, as long as the support area is able to abut against the support member 4 and support the single battery 100.

[0081] In actual implementation, the support areas may be provided on both ends of the cell 100 along the direction of dimension A, and thus the cell 100 can be supported on the support member 4 along the direction of dimension A.

[0082] The inventors of the present application have found that when the dimension A of the cell 100 is designed to be between 600 mm and 2500 mm, the cell 100 is long enough to be directly supported by the support member 4, and by forming a plurality of cells 100 into a module and then supporting it, the cell 100 itself can perform the supporting function, and the structural strength of the battery pack 200 can be ensured without a reinforcing structure. In this way, the use of the horizontal beams 500 and / or vertical beams 600 in the battery pack 200 can be reduced, and further, the horizontal beams 500 and / or vertical beams 600 can be eliminated in the battery pack 200. As a result, the space occupied by the horizontal beams 500 and / or vertical beams 600 in the battery pack 200 can be reduced, the space utilization rate of the battery pack 200 can be improved, and as many cells 100 as possible can be arranged in the battery pack 200, which ultimately improves the capacity, voltage, and driving range of the entire battery pack. For example, in an electric vehicle, this design can improve the space utilization rate from the conventional level of about 40% to 60% or more, or even higher, such as 80%. The inventors of the present application have found through multiple experiments that if the cells 100 are designed as pouch batteries, i.e., if the cell casings are made of aluminum laminate film and the aluminum laminate film is used to support the cells, there is a risk of wear on the aluminum laminate film of the cells, and the pouch cells are likely to shift within the battery pack, further accelerating wear on the cells. Wear on the aluminum laminate film can lead to failure of the cells 100 and reduce the driving range of the battery pack. Furthermore, due to the poor heat dissipation performance of the pouch cells, even after the pouch cells are designed to the dimensions described herein and arranged in the battery pack, the heat dissipation performance of the entire battery pack will be relatively poor. Therefore, in the present application, the cell 100 includes a case, a cover plate, and a pole core located in the space formed by the case and the cover plate; in other words, the cell is a hard-case battery, and when the dimension A of the cell is 600 mm to 2500 mm, a support area is formed in the case and / or the cover plate, and the support member 4 abuts against the support area to support the cell.Here, the support member 4 abutting against the support area may mean that the support member 4 is in direct contact with the support area, or that the support member 4 is in indirect contact with or connected to the support area via another member, which can be set depending on the usage situation, and the present application does not limit this.

[0083] Furthermore, since there is no need to arrange horizontal beams and / or vertical beams in the battery pack 200, the manufacturing process of the battery pack 200 is simplified, the complexity of assembling the cells 100 is reduced, and production costs are reduced, while the weight of the battery pack 200 is reduced, realizing a lightweight battery pack. In particular, when the battery pack is installed in an electric vehicle, the driving range of the electric vehicle can be improved and the weight of the electric vehicle can be reduced.

[0084] In some embodiments, 600 mm≦dimension A≦1500 mm, or 600 mm≦dimension A≦1000 mm. A cell 100 having such a length is long enough to be supported by the support member 4, but not too long, and when used in the battery pack 200, the rigidity of the cell 100 itself is also sufficiently large.

[0085] The present application does not particularly limit the specific form of the battery pack, but only limits that the battery pack includes a support member 4, the battery array 3 is positioned on the support member 4, and the cells 100 are supported by the support member 4. The present application does not limit the specific structure of the support member 4, but only limits that the cells 100 can be supported by the support member 4, and the specific structure of the support member 4 will be described later. The cells 100 are supported by the support member 4, and the cells 100 are directly supported by the support member 4; that is, they may be placed on the support member 4 or fixed to the support member 4, and specific fixing modes will be described later, but the present application does not limit the specific supporting and fixing modes.

[0086] The support member 4 is for supporting the battery array 3, and is generally a rigid structure. To facilitate attachment to the entire vehicle or other devices, the support member 4 may be an independently processed tray or a rigid support structure molded into the chassis of the vehicle.

[0087] When the case of the cell 100 is made of a metal material, the thermal conductivity of the metal case of the cell 100 is further improved, improving the heat dissipation efficiency of the cell 100 and optimizing the heat dissipation effect.

[0088] In some embodiments, the plurality of cells are arranged along the K direction, which is the width direction of the smallest circumscribing rectangular parallelepiped of at least one cell in the battery array 3.

[0089] The cell 100 has a dimension B, which is the width of the smallest circumscribing rectangular parallelepiped of the cell, and the normal direction of the two parallel planes corresponding to the dimension B is the K direction, and the multiple cells are arranged along the K direction of at least one cell.

[0090] At least one cell satisfies the condition 10≦dimension A / dimension B≦208, and in some embodiments, at least one cell satisfies the condition 23≦dimension A / dimension B≦208, and in the embodiments of the present application, the condition 50≦dimension A / dimension B≦70. Through extensive testing, the inventors have found that when a cell 100 that satisfies the above dimensional requirements while still satisfying the rigidity support requirements is thinned in the direction of dimension B, the cell 100 itself has high heat dissipation capability.

[0091] In some embodiments, the plurality of cells are arranged along a K direction, which is the height direction of the smallest circumscribing rectangular parallelepiped of at least one cell 100 in the battery array 3. The cell 100 has a dimension C that is the height of the smallest circumscribing rectangular parallelepiped of the cell 100.

[0092] At least one cell 100 satisfies the conditions 10≦dimension A / dimension C≦208, 23≦dimension A / dimension C≦208, for example, 50≦dimension A / dimension C≦70. Through extensive testing, the inventors have found that when a cell 100 that satisfies the above dimensional requirements while also satisfying the rigidity support requirements has a reduced thickness in the direction of dimension C, the cell 100 itself has a high heat dissipation capability.

[0093] The battery pack 200 further includes two side plate members disposed opposite each other on both sides of the battery array 3 and sandwiching the battery array 3. The side plate members sandwich the battery array 3 and have the function of limiting the expansion and deformation of the plurality of cells 100, thereby ensuring the activation of the explosion-proof valve 103 and the current interruption device (CID). Specifically, in some embodiments, the side plate members may be a third side beam 203 and a fourth side beam 204 as shown in FIG. 4, and in other embodiments, the side plate members may be a first side plate 209 and a second side plate 210 as shown in FIG. 12.

[0094] In some embodiments, as shown in Figures 3 and 20 to 24, the battery pack 200 includes a vehicle tray including a first side beam 201 and a second side beam 202 arranged opposite each other along the longitudinal direction of the smallest circumscribed rectangular parallelepiped of the battery pack 200, the support member 4 is the first side beam 201 and the second side beam 202, and both ends of the single battery 100 are supported by the first side beam 201 and the second side beam 202, respectively.

[0095] In another embodiment, the support member 4 is a plurality of bottom beams, which are located below the battery array 3. The bottom beams are for supporting the battery array 3, and the upper surfaces of the bottom beams may be flat so as to be supported on the surface of the battery array 3. In actual implementation, the bottom beams have a rectangular cross section. There may be a plurality of bottom beams, and the plurality of bottom beams may be arranged parallel to each other and spaced apart, or may be arranged crosswise. The battery array 3 may be fixed to the bottom beams by adhesive, screw connection members, or other methods. The battery pack further includes a sealing cover that, together with the bottom beams, forms an accommodation chamber for accommodating the battery array 3. The sealing cover is for preventing the intrusion of dust, water, and the like.

[0096] As shown in FIG. 25 , the bottom beam includes a first beam 501 and a second beam 502 located on the first beam 501 and intersecting the first beam 501, the angle between the extension direction of the first beam 501 and the longitudinal direction of the smallest circumscribed rectangular parallelepiped of the cell 100 is 60 to 90 degrees, and the cell 100 is supported by the first beam 501. In the example shown in FIG. 25 , the first beam 501 and the second beam 502 are connected perpendicularly, and the connection between the first beam 501 and the second beam 502 includes, but is not limited to, connection using a screw connection member, welding, etc. Both the first beam 501 and the second beam 502 may be straight beams.

[0097] In actual implementation, there are two second beams 502, each located at both ends of the first beam 501 and perpendicular to the first beam 501, and the cell 100 is supported by the first beam 501. The second beams 502 protrude upward (in the Z direction) relative to the first beam 501. For example, the lower surface of the second beam 502 may be connected to the upper surface of the first beam 501. When the cells 100 are arranged, the two second beams 502 may abut against each of the two outermost cells 100 so that they face each other's sides. The center of the cell 100 is located on the first beam 501, and the longitudinal direction of the cell 100 is perpendicular to the longitudinal direction of the first beam 501. By aligning the center of the cell 100 with the first beam 501, it is possible to support the cell 100 with a single beam. Of course, in other embodiments, there may be a plurality of first beams 501, and the plurality of first beams 501 are spaced apart and parallel along the second direction.

[0098] It should be understood that the shape of the bottom beam includes, but is not limited to, a straight line or a rectangle, and may also be a triangle, a trapezoid, or other irregular shape. In another embodiment according to the present application, as shown in Fig. 16, the support member 4 is a chassis of an automobile, the battery array 3 is located on the chassis of the automobile, and the battery pack 200 may be directly formed on the electric vehicle, i.e., the battery pack 200 is formed at any suitable position on the electric vehicle and is a device for mounting the cells 100. For example, the battery pack 200 may be formed on the chassis of the electric vehicle.

[0099] In some embodiments, the automobile chassis is provided with a downwardly recessed chamber 300 to facilitate assembly of the cell 100 .

[0100] In a specific embodiment of the present application, the chamber 300 may include a first side wall 301 and a second side wall 302 provided opposite each other, and the first side wall 301 may extend downward from the chassis of the electric vehicle to form an extension portion of the first side wall 301, and the first side wall 301 may extend downward from the chassis of the electric vehicle to form an extension portion of the second side wall 302. Thus, in one embodiment, a first end of the cell 100 may be supported by the extension portion of the first side wall 301, and a second end of the cell 100 may be supported by the extension portion of the second side wall 302. That is, the present application further provides an electric vehicle in which the cells 100 can be arranged according to the above technical means, and the electric vehicle is formed with a chamber 300 having features similar to those of a single vehicle tray to form the battery pack 200 of the present application.

[0101] 2, the battery pack 200 forms a battery mounting area, the battery array 3 is located in the battery mounting area, the battery pack 200 includes one battery array 3, and the cells 100 extend from one side of the battery mounting area to the other side of the battery mounting area along the longitudinal direction of the smallest circumscribing rectangular parallelepiped of the cells. The battery pack 200 accommodates only one cell in the longitudinal direction of the smallest circumscribing rectangular parallelepiped of the cells 100.

[0102] In some embodiments, a battery mounting area is formed within the battery pack 200, the battery array 3 is located in the battery mounting area, and N (N is 1 or more) battery arrays 3 are provided in the battery mounting area along the width direction of the smallest circumscribed rectangular parallelepiped of the single cells, and the battery arrays 3 are electrically connected to each other by connecting members between the electrode terminals of the single cells.

[0103] In the battery mounting area, M (M is 1 or more) battery arrays 3 are provided along the longitudinal direction of the smallest circumscribing rectangular parallelepiped of the unit cells, and the battery arrays 3 are electrically connected to each other by connecting members between the electrode terminals of the unit cells.

[0104] 21, the first separator 700 divides the illustrated battery array 3 into two battery arrays 3 along the K direction of the battery pack 200. The last cell 100 in the front battery array 3 and the first cell in the rear battery array 3 are connected by a connecting member.

[0105] According to the battery pack 200 of the present application, a battery mounting area is formed within the battery pack, and the battery array 3 is located in the battery mounting area. M (M is 1 or more) battery arrays 3 are provided in the battery mounting area along the Q direction, and the battery arrays 3 are electrically connected to each other by connecting members between the electrode terminals of the cells. The electrode terminal of the last cell in the (M-1)th (M is 1 or more) battery array 3 is connected to the electrode terminal of the first cell in the Mth battery array 3 by a connecting member. In other words, a plurality of cells 100 may be housed in the direction in which the cells 100 extend, i.e., a plurality of rows of battery arrays 3 are provided within the battery pack 200.

[0106] 20, the second separator 800 divides the battery array 3 into two battery arrays 3 along the Q direction of the battery pack 200. The last cell 100 in the front battery array 3 and the first cell in the rear battery array 3 are connected by a connecting member.

[0107] According to the battery pack 200 of the present application, a battery mounting area is formed within the battery pack, and the battery array 3 is located in the battery mounting area, and N (N is 1 or more) battery arrays 3 are provided along the K direction and M (M is 1 or more) battery arrays 3 are provided along the Q direction in the battery mounting area, and the battery arrays 3 are electrically connected to each other by connection members between the electrode terminals of the unit cells. In other words, the battery mounting area is divided into multiple sub-battery mounting areas in the K direction of the battery pack, and multiple unit cells 100 may be housed in the Q direction, in which the unit cells 100 extend; that is, multiple rows and multiple columns of battery arrays 3 are provided within the battery pack 200.

[0108] 22, a first separator 700 and a second separator 800 are provided in a battery pack 200, and the first separator 700 and the second separator 800 divide a plurality of unit cells into two rows and two columns of battery arrays 3. Any two battery arrays 3 are connected by a connecting member between the electrode terminals.

[0109] In the above description, the first separator 700 and the second separator 800 may be reinforcing ribs or other structural members such as insulating cotton, and the present application is not limited thereto.

[0110] A battery mounting area is formed within the battery pack, and the battery array 3 is located in the battery mounting area. J (J is 1 or more) battery arrays 3 are provided in the battery mounting area along the height direction of the smallest circumscribed rectangular parallelepiped of the single cells, and the battery arrays 3 are electrically connected to each other by connecting members between the electrode terminals of the single cells.

[0111] The present application does not particularly limit the number of cells 100 in the battery array 3, and different numbers of cells 100 can be arranged depending on different vehicle models and different required power. In some specific examples of the present application, the number of cells in the battery array 3 is 60 to 200, and in other specific examples of the present application, the number of cells in the battery array 3 is 80 to 150.

[0112] As shown in FIGS. 2 to 25, a battery pack 200 according to yet another embodiment of the present application includes a battery array 3 and a support member 4. The battery array 3 and the support member 4 are electrically connected to each other.

[0113] The battery array 3 includes a plurality of cells 100, and at least one cell 100 includes a battery body and an electrode terminal extending from the battery body to draw an internal current of the battery body, the battery body being a substantially rectangular parallelepiped, the length of the battery body being L, and satisfying the condition that 600 mm≦L≦2500 mm. The cell 100 includes a case and a pole core located within the case, a support area is formed in the case, and a support member 4 abuts against the support area to support the cell 100.

[0114] In addition, the battery body being approximately rectangular means that the battery body may be rectangular or cubic, or may have localized irregularities but be approximately rectangular or cubic, or may have localized notches, protrusions, chamfers, curvatures, and bends but be approximately rectangular or cubic overall.

[0115] In the prior art, because the dimensions of the cells 100 are small and the length L of the battery body is short, much smaller than the dimensions of the battery pack in the Y or X direction, the cells 100 cannot play a role in reinforcing the structural strength of the battery pack. As a result, it is necessary to provide the battery pack 200 with horizontal beams 500 and / or vertical beams 600 (shown in FIG. 1 ) to facilitate the assembly of the cells 100. When the cells 100 are attached to the battery pack 200 by the battery modules 400, the battery modules are fixed to the adjacent horizontal beams 500 and / or vertical beams 600 by fasteners.

[0116] In the prior art, horizontal beams 500 and / or vertical beams 600 are provided in the battery pack, and the horizontal beams 500 and / or vertical beams 600 occupy a large amount of the mounting space for accommodating the cells in the battery pack 200, resulting in a low volume utilization rate of the battery pack. Generally, the volume utilization rate of the battery pack 200 is about 40%, and even lower. In other words, in the prior art, the space for mounting the cells in the battery pack 200 is only about 40%, so the number of cells 100 that can be accommodated in the battery pack 200 is limited, which limits the capacity and voltage of the entire battery pack and reduces the driving range of the battery pack.

[0117] The inventors of the present application discovered that by designing the length L of the battery body of each cell 100 to be 600 mm to 2500 mm, the battery body of each cell 100 is sufficiently long so that the battery body itself can provide support, ensuring the structural strength of the battery pack 200 without the need for a reinforcing structure. This reduces the need for horizontal beams 500 and / or vertical beams 600 in the battery pack 200, and even eliminates the need for horizontal beams 500 and / or vertical beams 600. This reduces the space occupied by the horizontal beams 500 and / or vertical beams 600 in the battery pack 200, improves the space utilization of the battery pack 200, allows as many cells 100 as possible to be placed in the battery pack 200, and ultimately improves the capacity, voltage, and driving range of the entire battery pack. For example, in an electric vehicle, this design can improve the space utilization rate from the conventional level of around 40% to over 60%, or even higher, such as 80%. The inventors of the present application have found through multiple experiments that if the cells 100 are designed as pouch batteries, that is, if the cell casing is made of aluminum laminate film and the aluminum laminate film is used to support the cells, there is a risk of wear on the aluminum laminate film of the cells, and the pouch cells are likely to shift within the battery pack, further accelerating wear on the cells. As the aluminum laminate film wears, the cells 100 break down and the cruising capacity of the battery pack decreases, and furthermore, because the pouch cells have poor heat dissipation performance, after the pouch cells are designed to the dimensions described herein and arranged in the battery pack, the heat dissipation performance of the entire battery pack becomes relatively poor. Therefore, in the present application, the cell 100 includes a case, a cover plate, and a pole core located in the space formed by the case and the cover plate. In other words, the cell is a hard-case battery, and when the length L of the cell is 600 mm to 2500 mm, a support area is formed in the case and / or the cover plate, and the support member 4 abuts against the support area to support the cell. Here, the support member 4 abutting against the support area may mean that the support member 4 is in direct contact with the support area, or that the support member 4 is in indirect contact with or connected to the support area via another member. This can be determined depending on the usage situation, and the present application does not limit it thereto.

[0118] Furthermore, since there is no need to arrange horizontal beams and / or vertical beams in the battery pack 200, the manufacturing process of the battery pack 200 is simplified, the complexity of assembling the cells 100 is reduced, and production costs are reduced, while the weight of the battery pack 200 is reduced, realizing a lightweight battery pack. In particular, when the battery pack is installed in an electric vehicle, the driving range of the electric vehicle can be improved and the weight of the electric vehicle can be reduced.

[0119] The present application does not particularly limit the specific form of the battery pack, but only limits that the battery pack includes a support member 4, the battery array 3 is positioned on the support member 4, and the cells 100 are supported by the support member 4. The present application does not limit the specific structure of the support member 4, but only limits that the cells 100 can be supported by the support member 4, and the specific structure of the support member 4 will be described later. The cells 100 are supported by the support member 4, and the cells 100 are directly supported by the support member 4; that is, they may be placed on the support member 4 or fixed to the support member 4, and specific fixing modes will be described later, but the present application does not limit the specific supporting and fixing modes.

[0120] The support member 4 is for supporting the battery array 3. The support member 4 is generally a rigid structure and may be an independently processed tray or a rigid support structure molded to the chassis of the vehicle. The support member 4 maintains the complete shape of the battery pack and makes it easy to attach the battery pack to the entire vehicle or other devices.

[0121] In the present application, since the length L of the battery body of the single battery 100 is long, the battery body itself can perform a supporting function, reducing the reinforcing effect of the horizontal and vertical beams in the battery pack, increasing the space utilization rate of the battery pack, and allowing more single batteries to be arranged.

[0122] The battery body of the battery 100 has three mutually perpendicular directions: X, Y, and Z. Each pair of the X, Y, and Z directions is perpendicular, with the X direction being the arrangement direction of the battery 100, the Y direction being the longitudinal direction of the battery 100, and the Z direction being the height direction of the battery 100. In actual implementation, for example, in the embodiment shown in Figures 20 to 23, when battery pack 200 is attached to the entire vehicle, the longitudinal direction of battery pack 200 may be parallel to the longitudinal direction of vehicle 1, the width direction of battery pack 200 may be parallel to the lateral direction of vehicle 1, the Y direction may be parallel to the lateral direction of vehicle 1, the X direction may be parallel to the longitudinal direction of vehicle 1, and the Z direction may be parallel to the vertical direction of vehicle 1. For example, in the embodiment shown in Figure 24, when battery pack 200 is attached to the entire vehicle, the longitudinal direction of battery pack 200 may be parallel to the longitudinal direction of vehicle 1, the width direction of battery pack 200 may be parallel to the lateral direction of vehicle 1, the Y direction may be parallel to the longitudinal direction of vehicle 1, the X direction may be parallel to the lateral direction of vehicle 1, and the Z direction may be parallel to the vertical direction of vehicle 1. Naturally, when the battery pack 200 is attached to the entire vehicle, the X direction, Y direction, and Z direction may have a correspondence relationship different from the actual directions of the vehicle, and the actual correspondence relationship depends on the attachment direction of the battery pack 200.

[0123] Unless otherwise specified, the direction in which a vehicle in this application travels is the longitudinal direction of the vehicle, the direction perpendicular to and flush with the direction in which the vehicle travels is the lateral direction of the vehicle, generally the horizontal direction, and the up-down direction is the vertical direction of the vehicle, generally the vertical direction.

[0124] In some embodiments, the cells 100 may be arranged in order in the X direction, or the number of cells may be limited. In this arrangement, the number of cells arranged in the battery pack is large, which results in a relatively low heat dissipation performance of the entire battery pack. In order to improve the safety performance of the entire battery pack, the thickness along the X direction and the height along the Z direction are reduced by limiting L / H or L / D, and the surface area of ​​each cell is made larger than that of a cell in the prior art. This increases the heat dissipation area of ​​the cells, improves the heat dissipation rate of the cells, and further improves the safety of the entire battery pack, making the battery pack safer and more reliable.

[0125] On the other hand, when the case of the cell 100 is made of a metal material, the thermal conductivity of the metal case of the cell 100 is even higher, improving the heat dissipation efficiency of the cell 100 and optimizing the heat dissipation effect.

[0126] The plurality of single cells 100 have a plurality of arrangement forms in the battery array 3, and the battery body has a length L, a thickness D, and a height H, with the thickness direction being the X direction, the longitudinal direction being the Y direction, and the height direction being the Z direction.

[0127] In one embodiment of the present application, the plurality of cells 100 may be arranged at a distance from one another along the X direction, or may be closely arranged. As shown in FIG. 2, in this embodiment, the cells 100 are closely arranged along the X direction to fully utilize the space.

[0128] In some embodiments, the cells 100 are arranged along the X direction of at least one cell in the battery array 3, and the X direction is the thickness direction of any one cell 100 in the battery array 3. The thickness of the battery body is D, and at least one cell 100 satisfies the conditions 10≦L / D≦208, 23≦L / D≦208, and 50≦L / D≦70. Through extensive testing, the inventors have found that when the X direction thickness of a cell 100 that satisfies the above dimensional requirements while still meeting the rigidity support requirements is reduced, the cell 100 itself has high heat dissipation capability.

[0129] In another embodiment, the plurality of cells 100 are arranged along the Z direction of at least one cell in the battery array 3. The Z direction is the height direction of any one cell 100 in the battery array 3. The height of the battery body is H, and at least one cell 100 satisfies the conditions 10≦L / H≦208 and 23≦L / H≦208, and in some embodiments, the condition 50≦L / H≦70. Through extensive testing, the inventors have found that when the thickness in the Z direction of the battery body of a cell 100 that satisfies the above dimensional requirements while still meeting the rigidity support requirements is reduced, the battery body itself has high heat dissipation capability.

[0130] When the plurality of cells 100 are arranged, they may form an array with their ends aligned, or may be arranged at an angle to the X or Z direction, i.e., diagonally. The mounting directions of the plurality of cells 100 may be the same, partially different, or different from each other, as long as they are arranged along a predetermined direction.

[0131] In some embodiments, 600 mm≦L≦1500 mm, for example, 600 mm≦L≦1000 mm. A cell 100 having such a length is long, and when used in a battery pack 200, only one cell 100 needs to be arranged along the first direction.

[0132] In some embodiments, the volume of the cell body of the cell 100 is V, and at least one cell 100 has a volume of 0.0005 mm -2 ≦L / V≦0.002mm -2 Meet the conditions. The inventors have found through extensive testing that when the cell 100 satisfies the above limitations, the cross section of the cell body is small and the heat dissipation effect of the cell body is high, so the temperature difference between the inside and surroundings of the cell body is small.

[0133] In another embodiment of the present application, the ratio of the surface area S to the volume V of the battery body of the single cell 100 is 0.1 mm -1 ≦S / V≦0.35mm -1This ratio can be achieved by using the cell 100 having a long length and a thin thickness, or by adjusting the dimensions. By controlling the ratio of the surface area S to the volume V of the battery 100, the length of the battery body can be extended along the Y direction while ensuring a sufficient heat dissipation area, thereby ensuring the heat dissipation effect of the battery 100.

[0134] In some embodiments, the volume of the battery body is V, and the relationship between the height H of the battery body and the corresponding volume V of the battery body is 0.0001 mm -2 ≦H / V≦0.00015mm -2 is.

[0135] The surface area of ​​a cell refers to the sum of the areas of all the surfaces of the cell. When a surface of a cell is partially recessed inward or partially protruding outward, the surface area of ​​the cell is calculated using the length L, width H, and thickness D of the rectangle defined by the outer casing of the cell. The specific calculation formula is S=2(LD+LH+HD).

[0136] 3 to 4 and 20 to 24, the battery body has a length L, a thickness D, and a height H, with the thickness direction being the X direction, the longitudinal direction being the Y direction, and the height direction being the Z direction, where the height H of the battery body is equal to or greater than the thickness D of the battery body, and at least one cell satisfies the conditions 23≦L / D≦208 and 4≦L / H≦21. The cells are arranged along the X direction of at least one cell in the battery array 3, and in some embodiments, at least one cell satisfies the condition 9≦L / H≦13. Through extensive testing, the inventors have found that by reducing the X direction thickness of a battery body that satisfies the above dimensional requirements while still meeting the rigidity support requirements, the battery body itself has high heat dissipation capability and can easily achieve a close-packed arrangement of the cells 100 in the X direction.

[0137] In some exemplary embodiments of the present application, at least one single cell 100 has a first end and a second end along the Y direction, at least one of the first end and the second end has an electrode terminal that draws out an internal current of the single cell, and the electrode terminals between the single cells 100 are electrically connected by a connecting member.

[0138] Here, the "first end" and "second end" of the cell 100 are used to describe the directions of the cell 100 and are not used to limit the specific structure of the cell 100. For example, the first end and the second end are not used to limit the positive and negative electrodes of the cell 100. In one embodiment, as shown in FIGS. 2 to 4 , the first electrode terminal 101 of the cell 100 is drawn out from the first end of the cell 100 facing the Y direction, and the second electrode terminal 102 of the cell 100 is drawn out from the second end of the cell 100 facing the Y direction. In other words, the longitudinal direction of the cell 100 may be the direction of current flow inside the cell 100, i.e., the direction of current flow inside the cell 100 is the Y direction. Since the current direction is the same as the longitudinal direction of the cell 100, the effective heat dissipation area of ​​the cell 100 is larger and the heat dissipation efficiency is higher. Here, the first electrode terminal 101 is the positive electrode of the cell 100, and the second electrode terminal 102 is the negative electrode of the cell 100, or alternatively, the first electrode terminal 101 is the negative electrode of the cell 100, and the second electrode terminal 102 is the positive electrode of the cell 100. The electrode terminals of the cell 100 are connected in series and parallel by a connecting member.

[0139] In one embodiment, at least some of the cells 100 extend with their thickness direction along the X direction, that is, the cells are arranged along the thickness direction of the cells.

[0140] In some embodiments, the battery array 3 includes a plurality of cells 100 arranged in order along the X direction, with the length of the cells 100 extending along the Y direction and the height of the cells 100 extending along the Z direction. That is, when the plurality of cells 100 are arranged along the thickness direction and extend along the longitudinal direction, the space of the battery pack can be fully utilized to accommodate more cells.

[0141] The length of the single cell 100 has a first end and a second end, and the first end and / or the second end have electrode terminals that draw out the internal current of the single cell, and the electrode terminals of the single cells are connected to each other by a connecting member.

[0142] Here, the "first end" and "second end" of the cell 100 are used to describe the directions of the cell 100 and are not intended to limit the specific structure of the cell 100. For example, the first end and the second end are not intended to limit the positive and negative electrodes of the cell 100. In one embodiment, as shown in FIGS. 2 to 4 , the first electrode terminal 101 of the cell 100 is drawn out from the first end in the longitudinal direction of the cell 100, and the second electrode terminal 102 of the cell 100 is drawn out from the second end in the longitudinal direction of the cell 100. In other words, the longitudinal direction of the cell 100 may be the direction of current flow inside the cell 100, i.e., the direction of current flow inside the cell 100 is the Y direction. Since the current direction is the same as the longitudinal direction of the cell 100, the effective heat dissipation area of ​​the cell 100 is larger and the heat dissipation efficiency is higher. Here, the first electrode terminal 101 is the positive electrode of the cell 100, and the second electrode terminal 102 is the negative electrode of the cell 100, or alternatively, the first electrode terminal 101 is the negative electrode of the cell 100, and the second electrode terminal 102 is the positive electrode of the cell 100. The electrode terminals of the cell 100 are connected in series and parallel by a connecting member.

[0143] In the prior art, how to design the dimensions of the rectangular cell 100 to have an appropriate battery capacity and a high heat dissipation effect is one of the problems to be solved in the technical field of batteries.

[0144] In one embodiment of the present application, the ratio of the length L to the thickness D of the battery body of at least one cell 100 satisfies the condition 23≦L / D≦208. With this ratio, a cell 100 with an appropriate length and a thin thickness can be obtained. Thus, even when the length of the cell 100 extends along the first direction, it is possible to maintain an appropriate resistance value, a wide heat dissipation area, and high heat dissipation efficiency, making it highly adaptable to various vehicle models.

[0145] In one embodiment of the present application, the ratio of the length L to the thickness D of the battery body of at least one cell 100 satisfies the condition 50≦L / D≦70. At this ratio, a cell 100 with an appropriate length can be obtained, and the rigidity of the cell 100 itself is sufficiently high, making processing, transportation, and assembly easy. When the cell 100 is attached to a battery pack case, the high rigidity of the cell 100 can be utilized to use the cell 100 itself as a reinforcing beam. On the other hand, even when the length of the cell 100 extends along the first direction, appropriate resistance, a wide heat dissipation area, and high heat dissipation efficiency can be maintained, making the cell highly adaptable to various vehicle models.

[0146] According to the battery pack 200 of the present application, the battery pack 200 further includes two side plate members that are arranged opposite each other on both sides of the battery array 3 in the X direction and sandwich the battery array 3. The side plate members sandwich the battery array 3 and have the function of limiting the expansion and deformation of the multiple single cells 100, thereby ensuring the activation of the explosion-proof valve 103 and the current interruption device (CID). Specifically, in some embodiments, the side plate members may be third side beam 203 and fourth side beam 204, as shown in FIG. 4, and in other embodiments, the side plate members may be first side plate 209 and second side plate 210, as shown in FIG. 12.

[0147] The battery pack according to the present application further includes a sealing cover 220 that, together with the support member 4, forms an accommodation chamber for accommodating the battery array 3. The sealing cover 220 and the support member 4 define the accommodation chamber for accommodating the cells, and the sealing cover 220 provides waterproof and moisture-proof functions.

[0148] The battery pack 200 is manufactured separately and includes a vehicle tray that receives and mounts the cells 100. After the cells 100 are mounted in the vehicle tray, the vehicle tray may be attached to the vehicle body by fasteners, for example, suspended from the chassis of an electric vehicle, as shown in Figures 16, 18, and 19.

[0149] The vehicle tray includes a first side beam 201 and a second side beam 202 arranged opposite each other along the Y direction. The support member 4 is the first side beam 201 and the second side beam 202. A first end of the battery 100 is supported by the first side beam 201, and a second end of the battery 100 is supported by the second side beam 202. The technical concept of the present application does not limit the specific structure of the first side beam 201 and the second side beam 202. The first side beam 201 and the second side beam 202 are arranged opposite each other, and may be parallel to each other, arranged at an angle, linear, or curved. The first side beam 201 may be rectangular, cylindrical, or polygonal, and the present application does not particularly limit the shape.

[0150] The first side beam 201 and the second side beam 202 are arranged opposite each other along the Y direction, and the plurality of unit cells 100 are arranged between the first side beam 201 and the second side beam 202, with both ends of the unit cells 100 being supported by the first side beam 201 and the second side beam 202, respectively. In one embodiment, a first end of each unit cell 100 is supported by the first side beam 201, and a second end of each unit cell 100 is supported by the second side beam 202.

[0151] In other words, each single cell 100 extends between the first side beam 201 and the second side beam 202, and the multiple single cells 100 are arranged along the longitudinal direction of the first side beam 201 and the second side beam 202, i.e., along the X direction.

[0152] The first end and second end of the single battery 100 are supported by the first side beam 201 and the second side beam 202, respectively, and the single battery 100 is directly supported by the first side beam 201 and the second side beam 202, i.e., it may be placed on the first side beam 201 and the second side beam 202, respectively, or may be fixed to the first side beam 201 and the second side beam 202; specific fixing modes will be described in detail below, and the present application does not limit the specific supporting and fixing modes.

[0153] In some embodiments herein, a first end of each cell 100 may be directly or indirectly supported by the first side beam 201, and a second end of each cell 100 may be directly or indirectly supported by the second side beam 202. "Directly" means that the first end of each cell 100 is in direct contact with and mated to the first side beam 201, and that the second end of each cell 100 is in direct contact with and mated to the second side beam 202. "Indirectly" means, for example, in some embodiments, that the first end of each cell 100 is in direct contact with and mated to the first side beam 201 by the first end plate 207, and that the second end of each cell 100 is in direct contact with and mated to the second side beam 202 by the second end plate 208.

[0154] Furthermore, the single battery 100 may be perpendicular to the first side beam 201 and / or the second side beam 202, or may be arranged at an acute or obtuse angle with the first side beam 201 and / or the second side beam 202. For example, when the first side beam 201 and the second side beam 202 are parallel to each other, the first side beam 201, the second side beam 202 and the single battery 100 may have a rectangular, square, parallelogram, sector, or other structure; when the first side beam 201 and the second side beam 202 form an angle, the first side beam 201, the second side beam 202 and the single battery 100 may have a trapezoidal, triangular, or other structure. The present application does not limit the angular relationship between the first side beam 201 and the second side beam 202, or the angular relationship between the cell 100 and the first side beam 201 and the second side beam 202.

[0155] The fact that the first side beam 201 and the second side beam 202 are located on opposite sides of the tray along the Y direction means that, as shown in Figure 2, the first side beam 201 and the second side beam 202 are located on the outermost sides of the tray along the Y direction, and the first side beam 201 and the second side beam 202 are at the outermost sides of the tray.

[0156] Furthermore, the "first end" and "second end" of the above-mentioned single battery 100 are intended to explain the direction of the single battery 100, and are not intended to limit and explain the specific structure of the single battery 100; for example, the first end and the second end are not intended to limit and explain the positive and negative electrodes of the single battery 100; that is, in the present application, the end supported by the first side beam 201 of the single battery 100 is the first end, and the end supported by the second side beam 202 of the single battery 100 is the second end.

[0157] Vehicle trays typically have a large width (e.g., 1.2m to 2m) and a long length (e.g., 2m to 5m), with different vehicle models requiring different widths and lengths. The larger width and length of the vehicle body necessitates greater requirements for the overall dimensions of the tray installed at the bottom of the vehicle body. When the tray dimensions are large, prior art technologies require not only side beams located on the sides of the tray but also lateral beams inside the tray, otherwise sufficient support and structural strength cannot be provided for the batteries installed inside. After the lateral beams are added to the vehicle tray, the lateral beams share a portion of the load of the vehicle tray, and the lateral beams occupy the internal space, reducing the effective space available inside the tray. Furthermore, the presence of the lateral beams requires the installation of multiple battery modules in the width and length directions inside the tray to accommodate the installation of the lateral beams, resulting in complex installation and requiring many mounting components.

[0158] However, if the transverse beams are removed, the module layout and cell layout methods in the prior art cannot provide sufficient structural strength for the battery module, and the tray cannot provide sufficient load-bearing force.

[0159] In the present application, the length L of the unit cell is 600 to 1500 mm, and both ends of the unit cell 100 are supported by the first side beam 201 and the second side beam 202, distributing the weight of the unit cell to the tray side beams on both sides, eliminating the transverse beams, and effectively improving the load capacity of the tray.

[0160] The first side beam 201 and the second side beam 202 each include an inner wall surface aligned with two end faces of the battery cell 100, and an insulating plate is sandwiched between the inner wall surface of the first side beam 201 and a first end of the battery cell 100, i.e., the insulating plate is located between the battery cell 100 and the inner wall surface of the first side beam 201, and an insulating plate is sandwiched between the inner wall surface of the second side beam 202 and a second end of the battery cell 100, i.e., the insulating plate is located between the battery cell 100 and the inner wall surface of the second side beam 202. Specifically, the specific structure of the insulating plate is not limited as long as it can perform the functions of fixing, reinforcing, and preventing expansion of the battery array 3, and in some embodiments, the insulating plate may be a first end plate 207 and a second end plate 208, which will be described later.

[0161] The tray includes a bottom plate, and a first side beam 201 and a second side beam 202 are arranged opposite each other at both ends of the bottom plate along the Y direction. By arranging the battery cell 100 and the bottom plate at a distance from each other, the load on the battery cell 100 from the bottom plate can be reduced, and most of the weight of the battery cell 100 is borne by the first side beam and the second side beam, reducing the load requirements of the bottom plate, reducing the manufacturing process of the bottom plate, and reducing production costs.

[0162] That is, by providing the thermal insulation layer 217 between the bottom of the battery array 3 in which a plurality of cells 100 are arranged and the bottom plate of the tray, heat transfer between the cells 100 and the outside is blocked, the cells 100 are kept warm, and thermal interference between the external environment of the battery pack 200 and the cells 100 in the battery pack 200 is avoided. The thermal insulation layer 217 may be made of a material with heat insulating and heat-retaining properties, for example, made of thermal cotton.

[0163] In addition, in order to provide support force to the single cells 100 by the first side beam 201 and the second side beam 202, in one embodiment of the present application, as shown in Figures 5 and 6, a first support plate 213 is provided on the first side beam 201 and a second support plate 214 is provided on the second side beam 202, a first support surface is provided on the surface of the first support plate 213 facing the sealing cover 220, and a second support surface is provided on the surface of the second support plate 214 facing the sealing cover 220, a first end of each single cell 100 is supported on the first support surface of the first support plate 213, a second end of each single cell 100 is supported on the second support surface of the second support plate 214, a first mounting surface is provided on the surface of the first support plate 213 facing away from the sealing cover 220, and a second mounting surface is provided on the surface of the second support plate 214 facing away from the sealing cover 220. The bottom plate of the tray is attached to the first mounting surface and the second mounting surface, and the first support plate 213 may protrude inward from the bottom of the first side beam 201, and the second support plate 214 may protrude inward from the bottom of the second side beam 202.

[0164] Compared to the prior art technical means of supporting the cells 100 by a bottom plate within the battery pack, in the present application, the cells 100 are supported by a first support plate 213 and a second support plate 214 provided on the first side beam 201 and the second side beam 202, thereby simplifying the structure of the battery pack 200 and reducing the weight of the battery pack 200. The first support plate 213 and the second support plate 214 may be provided with insulating plates, which are located between the cells 100 and the first support plate 213 and the second support plate 214.

[0165] The manner in which the first side beam 201, the second side beam 202 and the bottom plate are connected is not particularly limited, and they may be integrally formed or may be welded.

[0166] The inner wall surface of the first side beam 201 facing the single battery 100 has a first connection surface 215, and the distance from the first connection surface 215 to the sealing cover 220 is shorter than the distance from the first support surface to the sealing cover 220, and the inner wall surfaces of the second side beam 202 facing the single battery 100 both have a second connection surface, and the distance from the second connection surface 216 to the sealing cover 220 is shorter than the distance from the second support surface to the sealing cover 220, and both ends of the single battery 100 contact the first connection surface and the second connection surface, respectively.

[0167] In some embodiments, the first side beam 201 further includes a first connection surface 215, the second side beam 202 further includes a second connection surface 216, and a first end of each cell 100 is fixed to the first connection surface 215, and a second end of each cell 100 is fixed to the second connection surface 216. The first connection surface 215 may be a third support plate provided on the first side beam 201 and positioned above the first support plate 213, and the second connection surface 216 may be a fourth support plate provided on the second side beam 202 and positioned above the second support plate 214. The first and second ends of the battery may be fixed to the first and second connection surfaces 215 and 216 by fasteners or may be welded to the first and second connection surfaces 215 and 216.

[0168] In actual implementation, the inner wall surface of the first side beam 201 facing the single battery 100 has a step structure with at least two steps, and the surfaces of the two steps facing the sealing cover 220 are respectively formed with a first connection surface 215 and a first support surface, and the inner wall surface of the second side beam 202 facing the single battery 100 has a step structure with at least two steps, and the surfaces of the two steps facing the sealing cover 220 are respectively formed with a second connection surface 216 and a second support surface.

[0169] According to the battery pack of the present application, at least some of the plurality of unit cells 100 are provided with a first end plate 207 at an end of one unit cell 100 adjacent to the first side beam 201, facing the first side beam 201, as shown in FIGS. 12 and 14 , and at least some of the plurality of unit cells 100 are provided with a second end plate 208 at an end of one unit cell 100 adjacent to the second side beam 202, facing the second side beam 202, and the first end of at least one unit cell 100 is a first end plate 207 connected to the first connection surface 215, and a second end of at least one cell 100 connected to the second connection surface 216 by a second end plate 208; i.e., at least one cell is supported on the first side beam 201 by the first end plate, and at least one cell 100 is supported on the second side beam 202 by the second end plate 208; and the first end plate 207, the second end plate 208, and at least some of the cells 100 constitute a battery module. There may be one first end plate 207 and one second end plate 208, and the first end plate 207, the second end plate 208, and the cells 100 constitute one battery module, and the battery module is supported between the first side beam 201 and the second side beam 202 by the first end plate 207 and the second end plate 208. There may be a plurality of first end plates 207 and a plurality of second end plates 208, and the plurality of first end plates 207, second end plates 208 and cells 100 constitute a plurality of battery modules, each battery module being supported between the first side beam 201 and the second side beam 202 by the corresponding first end plate 207 and second end plate 208, each battery module extending between the first side beam 201 and the second side beam 202, and the plurality of battery modules being arranged along the longitudinal direction of the first side beam 201 and the second side beam 202. The present application does not limit the number of first end plates 207 and second end plates 208, i.e., the number of battery modules.

[0170] In some embodiments, the first end plate 207 includes an end plate body 231 provided facing the end face of the battery 100 and a first connecting plate 232 connected to the end plate body 231 and protruding toward the first side beam 201, the second end plate 208 includes an end plate body 231 provided facing the end face of the battery 100 and a first connecting plate 232 connected to the end plate body 231 and protruding toward the second side beam 202, the first connecting plate 232 of the first end plate 207 being connected to the first connecting surface 215, and the first connecting plate 232 of the second end plate 208 being connected to the second connecting surface 216. A specific connection form is not limited.

[0171] In one embodiment, as shown in Figures 2 and 10, an explosion-proof valve 103 is provided at a first end of the single battery 100 facing the first side beam 201, an exhaust passage 222 is provided inside the first side beam 201, an exhaust hole 221 is provided in the first side beam 201 at a position corresponding to the explosion-proof valve 103, the exhaust hole 221 is connected to the exhaust passage 222, the battery pack 200 is provided with an exhaust port connected to the exhaust passage 222, the explosion-proof valve 103 is provided at a second end of the single battery 100 facing the second side beam 202, an exhaust passage 222 is provided inside the second side beam 202, the second side beam 202 is provided with an exhaust hole 221 at a position corresponding to the explosion-proof valve 103, the exhaust hole 221 is connected to the exhaust passage 222, and the battery pack 200 is provided with an exhaust port connected to the exhaust passage 222. In other embodiments, as shown in Figures 12 and 14, the exhaust holes 221 may be formed in the first end plate 207 and the first side beam 201, and / or the second end plate 208 and the second side beam 202.

[0172] In the prior art, when the internal air pressure of a battery rises to a certain level during use, the explosion-proof valve opens, and flames, smoke, or gases inside the battery are released through the explosion-proof valve and collected inside the battery pack. If they cannot be released in a timely manner, they may cause secondary damage to the battery. However, in the present application, the first side beam 201 and / or the second side beam 202 are provided with an air intake 221 corresponding to the explosion-proof valve 103 of the single battery 100, and an exhaust passage 222 is provided inside the first side beam 201 and / or the second side beam 202. Therefore, when the air pressure inside the single battery 100 rises, the explosion-proof valve 103 opens, and the flame, smoke, gas, etc. inside it enters the exhaust passage 222 in the first side beam 201 and / or the second side beam 202 directly through the air intake 221, and is then discharged from the first side beam 201 and / or the second side beam 202 through the exhaust hole, for example, into the atmosphere. In this way, the flame, smoke, or gas does not collect inside the battery pack 200, thereby avoiding secondary damage to the single battery 100.

[0173] In some embodiments, a management accommodation chamber for accommodating battery management components and power distribution components is defined between the first connection surface 215, the second connection surface 216 and the sealing cover 220. This can save the space occupied by the battery management components and power distribution components, allowing more cells to be arranged in the battery pack, improving space utilization, and increasing volumetric energy density and driving range.

[0174] Regarding the tray bottom plate, by providing a distance between the cells 100 and the tray bottom plate, the tray bottom plate is not subjected to force, the manufacturing process for the tray bottom plate is simplified, and manufacturing costs can be reduced. By providing a thermal insulation layer between the cells 100 and the tray bottom plate, heat transfer between the cells 100 and the outside is blocked, the thermal insulation function of the cells 100 is realized, and thermal interference between the external environment of the battery pack 200 and the cells 100 in the battery pack 200 is prevented. The thermal insulation layer may be made of a material with heat insulating and heat-retaining properties, for example, thermal cotton.

[0175] In one embodiment according to the present application, as shown in FIGS. 3 to 8 , the battery pack 200 may further include a third side beam 203 and a fourth side beam 204 that are provided opposite each other along the X direction, and the plurality of cells 100 are arranged between the third side beam 203 and the fourth side beam 204 along the X direction. In one embodiment, the first side beam 201 and the second side beam 202 are connected perpendicularly to the third side beam 203 and the fourth side beam 204, thereby forming the battery pack 200 into a rectangular or square shape. In other embodiments, the first side beam 201 and the second side beam 202 may be parallel to each other, and the third side beam 203 and the fourth side beam 204 may be provided at an angle to the first side beam 201 and the second side beam 202 in order to form the battery pack 200 into a trapezoid, a parallelogram, or the like. The present application does not limit the specific shape of the battery pack 200 configured with the first side beam 201, the second side beam 202, the third side beam 203, and the fourth side beam 204.

[0176] In some embodiments, as shown in FIG. 2 , the third side beam 203 and the fourth side beam 204 provide a pressing force to the battery array 3, the third side beam 203 applies a biasing force toward the fourth side beam 204 to the battery cells 100 arranged adjacent to the third side beam 203, and the fourth side beam 204 applies a biasing force toward the third side beam 203 to the battery cells 100 arranged adjacent to the fourth side beam 204. In this way, multiple battery cells 100 can be densely arranged between the third side beam 203 and the fourth side beam 204 along the X direction, and multiple battery cells 100 can be attached to each other. In addition, the third side beams 203 and the fourth side beams 204 can restrict the positions of the cells 100 in the X direction. In particular, when the cells 100 expand slightly, they act to cushion the cells 100 and provide inward pressure, preventing the cells 100 from expanding or deforming too much. In particular, when the cells 100 are equipped with an explosion-proof valve 103 and a current interrupter device (CID), the third side beams 203 and the fourth side beams 204 can effectively restrict the expansion of the cells 100. If the cells 100 expand due to a malfunction, the interior of the cells 100 will have sufficient gas pressure to break through the inverted sheet in the explosion-proof valve 103 or the current interrupter device (CID), causing a short circuit in the cells 100. This ensures the safety of the cells 100 and prevents the cells 100 from exploding.

[0177] As shown in Figures 12 and 13, a first elastic device 205 may be provided between the third side beam 203 and the battery cell 100 adjacent to the third side beam 203, and / or a second elastic device 206 may be provided between the fourth side beam 204 and the battery cell 100 adjacent to the fourth side beam 204. The first elastic device 205 may be attached to the third side beam 203, and the second elastic device 206 may be attached to the fourth side beam 204, and the first elastic device 205 and the second elastic device 206 allow multiple single cells 100 to be densely arranged, and in this way, the number of single cells 100 arranged between the third side beam 203 and the fourth side beam 204 can be adjusted by changing the attachment distance between the first elastic device 205 and the second elastic device 206 and the third side beam 203 and the fourth side beam 204 without changing the pitch between the third side beam 203 and the fourth side beam 204.

[0178] In some embodiments, the third side beam 203 further includes a third connection surface 236, the fourth side beam 204 further includes a fourth connection surface 235, and the first side of each cell 100 is fixed to the third connection surface 236 and the second side of each cell 100 is fixed to the fourth connection surface 235.

[0179] In at least some of the multiple single cells 100, as shown in Figures 12 and 13, a first side panel 209 is provided at the end of one single cell 100 adjacent to the third side beam 203 facing the third side beam 203, and in at least some of the multiple single cells 100, a second side panel 210 is provided at the end of one single cell 100 adjacent to the fourth side beam 204 facing the fourth side beam 204.

[0180] A first side of at least one cell 100 is connected to the third connection surface 236 by the first side plate 209, and a second side of at least one cell 100 is connected to the fourth connection surface 235 by the second side plate 210, i.e., at least one cell is supported on the fourth side beam 204 by the first side plate, and at least one cell 100 is supported on the fourth side beam 204 by the second side plate 210, and the first side plate 209, the second side plate 210 and at least some of the multiple cells 100 constitute a battery module. There may be one first side plate 209 or one second side plate 210, and the first side plate 209, the second side plate 210, and the plurality of cells 100 constitute one battery module, and the battery module is supported between the third side beam 203 and the fourth side beam 204 by the first side plate 209 and the second side plate 210. There may be multiple first side plates 209 or multiple second side plates 210, and the plurality of first side plates 209, the second side plates 210, and the plurality of cells 100 constitute multiple battery modules, and each battery module is supported between the third side beam 203 and the fourth side beam 204 by the corresponding first side plate 209 and second side plate 210, and each battery module is arranged between the third side beam 203 and the fourth side beam 204. In the present application, the number of first side plates 209 and second side plates 210, that is, the number of battery modules, is not limited.

[0181] In some embodiments, the first side plate 209 includes a side plate body 234 provided facing the end face of the battery 100 and a second connecting plate 233 connected to the side plate body 234 and protruding toward the third side beam 203, the second side plate 210 includes a side plate body 234 provided facing the end face of the battery 100 and a second connecting plate 233 connected to the side plate body 234 and protruding toward the fourth side beam 204, the second connecting plate 233 corresponding to the first side plate 209 is connected to the third connecting surface 236, and the second connecting plate 233 corresponding to the second side plate 210 is connected to the fourth connecting surface 235. A specific connection form is not limited.

[0182] In some embodiments, at least some of the cells 100 are supported between the first side beam 201 and the second side beam 202 by the second panel 211, and the second panel 211 and at least some of the cells 100 constitute a battery module. In other words, the second panel 211 is provided below at least some of the plurality of cells 100, and each cell 100 is supported by the first side beam 201 and the second side beam 202 by the second panel 211, and the second panel 211 and at least some of the plurality of cells 100 constitute a battery module. In this embodiment, supporting the plurality of cells 100 by the first side beam 201 and the second side beam 202 by the second panel 211 simplifies the structure of the battery module and helps to reduce the weight of the battery pack.

[0183] The first end plate 207 and the second end plate 208, or the second panel 211, may be supported by the first side beam 201 and the second side beam 202 in various embodiments, and the present application is not limited thereto, for example, by being detachably fastened to the first side beam 201 and the second side beam 202 by fasteners, or fixed to the first side beam 201 and the second side beam 202 by welding, or connected to the first side beam 201 and the second side beam 202 in a dispensing manner, or placed directly on the first side beam 201 and the second side beam 202 and supported by the first side beam 201 and the second side beam 202.

[0184] In one embodiment, the battery pack 200 includes a first panel 212 and a second panel 211 connected to the upper and lower surfaces of at least some of the cells 100, respectively; a first end plate 207 and a second end plate 208 provided on two end surfaces of at least some of the cells 100, respectively; and a first side plate 209 and a second side plate 210 provided on the outer surfaces of the two outermost cells 100, respectively. The first end plate 207, the second end plate 208, the first side plate 209, and the second side plate 210 are all connected to two panels, the first panel 212 and the second panel 211, and the inner wall surface of the first side beam 201 facing the cells 100 is a first support surface and a second side plate 210. and a first connection surface 215, the inner wall surface of the second side beam 202 facing the battery 100 has a second support surface and a second connection surface 216, the first end of the battery 100 is supported on the first support surface and the second end of the battery 100 is supported on the second support surface, the first end plate 207 is connected to the first connection surface 215 and the second end plate 208 is connected to the second connection surface 216, the inner wall surface of the third side beam 203 facing the battery 100 has a third connection surface 236, the inner wall surface of the fourth side beam facing the battery has a fourth connection surface 235, the first side plate 209 is connected to the third connection surface 236 and the second side plate 210 is connected to the fourth connection surface 235.

[0185] According to the above embodiment, the first end plate 207, the second end plate 208, the first side plate 209, the second side plate 210, the first panel 212 and the second panel 211 together define an enclosed storage space that houses a plurality of cells 100. Thus, if a cell 100 fails, catches fire and explodes, the first end plate 207, the second end plate 208, the first side plate 209, the second side plate 210, the first panel 212 and the second panel 211 can control the failure of the cell 100 within a certain range and prevent the explosion of the cell 100 from affecting surrounding components. The first side plate 209 may be the first elastic device 205, and the second side plate 210 may be the second elastic device 206. In this way, the first side plate 209 and the second side plate 210 have the function of limiting the expansion deformation of the multiple single cells 100, thereby ensuring the activation of the explosion-proof valve 103 and / or the current interruption device (CID).

[0186] For embodiments including a first panel 212 in the battery module, as shown in Figure 11, a thermally conductive plate 218 may be provided between the first panel 212 and the cells 100, thus helping to dissipate heat from the cells 100 and ensuring that the temperature difference between the cells 100 is not too large. The thermally conductive plate 218 may be made of a material with high thermal conductivity, for example, the thermally conductive plate 218 may be made of a material with high thermal conductivity, such as copper or aluminum.

[0187] In some embodiments, as an optional embodiment, when the battery pack is used as a battery pack for use in a vehicle to supply electrical energy, the longitudinal direction of the cells 100 can be aligned with the width of the vehicle, i.e., the left-right direction of the vehicle.

[0188] In another embodiment of the present application, the support member 4 is a plurality of bottom beams, which are located below the battery array 3. The bottom beams are for supporting the battery array 3, and the upper surfaces of the bottom beams may be flat so as to be supported on the surface of the battery array 3. In actual implementation, the bottom beams have a rectangular cross section. There may be a plurality of bottom beams, and the plurality of bottom beams may be arranged parallel to each other and spaced apart, or may be arranged crosswise. The battery array 3 may be fixed to the bottom beams by adhesive, screw connection members, or other methods. The battery pack further includes a sealing cover that, together with the bottom beams, forms an accommodation chamber for accommodating the battery array 3. The sealing cover is for preventing the intrusion of dust, water, and the like.

[0189] 25, the bottom beam includes a first beam 501 and a second beam 502 located on the first beam 501 and intersecting the first beam 501, the angle between the extension direction of the first beam 501 and the Y direction is 60 to 90 degrees, and the battery 100 is supported by the first beam 501. In the embodiment shown in FIG. 25, the first beam 501 and the second beam 502 are connected vertically, and the connection between the first beam 501 and the second beam 502 includes, but is not limited to, connection using a screw connection member, welding, etc. Both the first beam 501 and the second beam 502 may be straight beams.

[0190] In actual implementation, there are two second beams 502, each located at both ends of the first beam 501 and perpendicular to the first beam 501, and the cell 100 is supported by the first beam 501. The second beams 502 protrude upward (in the Z direction) relative to the first beam 501. For example, the lower surface of the second beam 502 may be connected to the upper surface of the first beam 501. When the cells 100 are arranged, the two second beams 502 may abut against each of the two outermost cells 100 so that they face each other's sides. The center of the cell 100 is located on the first beam 501, and the longitudinal direction of the cell 100 is perpendicular to the longitudinal direction of the first beam 501. By aligning the center of the cell 100 with the first beam 501, it is possible to support the cell 100 with a single beam. Of course, in other embodiments, there may be a plurality of first beams 501, and the plurality of first beams 501 are spaced apart and parallel along the second direction.

[0191] In another embodiment, the bottom beam may be a plurality of rectangular beams arranged in parallel and spaced apart, the angle between the extension direction of the rectangular beams and the Y direction is 60 to 90 degrees, and the unit cells 100 are supported by the rectangular beams. The rectangular beams may be uniformly arranged along the Y direction, the extension direction of the rectangular beams being perpendicular to the Y direction, and the unit cells 100 are located on the uniformly arranged rectangular beams.

[0192] Of course, the shape of the bottom beam may be any shape including, but not limited to, straight, rectangular, triangular, trapezoidal, or other irregular shapes.

[0193] 16, in another embodiment according to the present application, the support member 4 is a chassis of an automobile, the battery array 3 is located on the chassis of the automobile, and the battery pack 200 may be formed directly on the electric automobile, that is, the battery pack 200 is formed at any appropriate position on the electric automobile and is a device for mounting the cells 100. For example, the battery pack 200 may be formed on the chassis of the electric automobile.

[0194] In some embodiments, the automobile chassis is provided with a downwardly recessed chamber 300 to facilitate assembly of the cell 100 .

[0195] In a specific embodiment of the present application, the chamber 300 may include a first side wall 301 and a second side wall 302 provided opposite each other, and the first side wall 301 may extend downward from the chassis of the electric vehicle to form an extension portion of the first side wall 301, and the first side wall 301 may extend downward from the chassis of the electric vehicle to form an extension portion of the second side wall 302. Thus, in one embodiment, a first end of the cell 100 may be supported by the extension portion of the first side wall 301, and a second end of the cell 100 may be supported by the extension portion of the second side wall 302. That is, the present application further provides an electric vehicle in which the cells 100 can be arranged according to the above technical means, and the electric vehicle is formed with a chamber 300 having features similar to those of a single vehicle tray to form the battery pack 200 of the present application.

[0196] In some examples, in one exemplary embodiment according to the present application, the extension of the first side wall 301 and the extension of the second side wall 302 form a bottom 305 of the chamber 300, and in one embodiment, the extension of the first side wall 301 abuts the extension of the second side wall 302 to form the chamber 300 with a downwardly concave U-shaped groove, and the cell 100 may be supported by the bottom 305 of the chamber 300. In another embodiment, the extension of the first side wall 301 and the extension of the second side wall 302 may be spaced apart by a fixed distance.

[0197] According to the battery pack 200 of the present application, as shown in FIG. 2, the battery pack 200 forms a battery mounting area, the battery array 3 is located in the battery mounting area, and the battery pack 200 includes one battery array 3.

[0198] In other words, there is no need to provide any reinforcing ribs within the battery pack, and the directly connected single cells 100 perform the function of the reinforcing ribs, greatly simplifying the structure of the battery pack 200 and reducing the space occupied by the reinforcing ribs and the space occupied by the mounting structure of the single cells 100, improving space utilization and range.

[0199] In some specific examples of the present application, the battery pack accommodates only one cell 100 in the Y direction, i.e., two or more cells 100 cannot be arranged in the Y direction in the battery pack 200, and accommodating only one cell 100 means that only one cell 100 can be arranged side by side in the Y direction in the battery pack 200. As shown in FIGS. 2 and 4 to 6 , the cell 100 is perpendicular to the first side beam 201 and the second side beam 202, the distance between the first end and the second end of the cell 100 is L1, the distance between the inner surface of the first side beam 201 and the inner surface of the second side beam 202 is L2, and the ratio of L1 to L2 satisfies the condition L1 / L2≧50%. In other words, only one cell 100 is disposed between the first side beam 201 and the second side beam 202 along the Y direction, and by setting the distance relationship between the cell 100 and the two side beams in this way in the Y direction, the purpose of using the cell 100 as a horizontal beam or a vertical beam can be achieved. In the exemplary embodiment according to the present application, by disposing only one cell 100 between the first side beam 201 and the second side beam 202 along the Y direction, the cell 100 itself can be used as a horizontal beam or a vertical beam to reinforce the structural strength of the battery pack 200.

[0200] In some embodiments, the ratio of L1 to L2 satisfies the condition of 80%≦L1 / L2≦97%, so that the first end and the second end of the battery 100 are as close as possible to the first side beam 201 and the second side beam 202, and even abut against the first side beam 201 and the second side beam 202, thus facilitating the realization of force distribution and transmission through the structure of the battery 100 itself, ensuring that the battery 100 can be used as a horizontal beam or a vertical beam to reinforce the structural strength of the battery pack 200, and ensuring that the battery pack 200 has sufficient strength to resist deformation due to external forces.

[0201] Naturally, the embodiment of the present application is not limited to the case where no reinforcing ribs are provided. Therefore, there may be a plurality of battery arrays 3.

[0202] According to the battery pack 200 of the present application, a battery mounting area is formed within the battery pack 200, and the battery arrays 3 are located in the battery mounting area. N (N is 1 or more) battery arrays 3 are provided along the X direction and M (M is 1 or more) battery arrays 3 are provided along the Y direction in the battery mounting area. The battery arrays 3 are electrically connected to each other by connecting members between the electrode terminals of the cells. The electrode terminal of the last cell in the (N-1)th (N is 1 or more) battery array 3 is connected to the electrode terminal of the first cell in the Nth battery array 3 by a connecting member. In other words, in the battery pack, multiple battery arrays 3 may be provided along the arrangement direction of the cells 100; that is, multiple rows of battery arrays 3 are provided within the battery pack 200.

[0203] 21, the first separator 700 divides the illustrated battery array 3 into two battery arrays 3 along the X direction of the battery pack 200. The last cell 100 in the front battery array 3 and the first cell in the rear battery array 3 are connected by a connecting member.

[0204] According to the battery pack 200 of the present application, a battery mounting area is formed within the battery pack, and the battery array 3 is located in the battery mounting area. M (M is 1 or more) battery arrays 3 are provided in the battery mounting area along the Y direction, and the battery arrays 3 are electrically connected to each other by connecting members between the electrode terminals of the cells. The electrode terminal of the last cell in the (M-1)th (M is 1 or more) battery array 3 is connected to the electrode terminal of the first cell in the Mth battery array 3 by a connecting member. In other words, a plurality of cells 100 may be housed in the direction in which the cells 100 extend, i.e., a plurality of rows of battery arrays 3 are provided within the battery pack 200.

[0205] 20, the second separator 800 divides the battery array 3 into two battery arrays 3 along the Y direction of the battery pack 200. The last cell 100 in the front battery array 3 and the first cell in the rear battery array 3 are connected by a connecting member.

[0206] According to the battery pack 200 of the present application, a battery mounting area is formed within the battery pack, and the battery array 3 is located in the battery mounting area, and N (N is 1 or more) battery arrays 3 are provided along the X direction and M (M is 1 or more) battery arrays 3 are provided along the Y direction in the battery mounting area, and the battery arrays 3 are electrically connected to each other by connection members between the electrode terminals of the unit cells. In other words, the battery mounting area is divided into multiple sub-battery mounting areas in the X direction of the battery pack, and multiple unit cells 100 may be housed in the Y direction, the extension direction of the unit cells 100, i.e., multiple rows and multiple columns of battery arrays 3 are provided within the battery pack 200.

[0207] 22, a first separator 700 and a second separator 800 are provided in a battery pack 200, and the first separator 700 and the second separator 800 divide a plurality of unit cells into two rows and two columns of battery arrays 3. Any two battery arrays 3 are connected by a connecting member between the electrode terminals.

[0208] In the above description, the first separator 700 and the second separator 800 may be reinforcing ribs or other structural members such as insulating cotton, and the present application is not limited thereto.

[0209] The present application does not particularly limit the number of cells 100 in the battery array 3, and different numbers of cells 100 can be arranged depending on different vehicle models and different required power. In some specific examples of the present application, the number of cells in the battery array 3 is 60 to 200, and in other specific examples of the present application, the number of cells in the battery array 3 is 80 to 150.

[0210] In the battery pack 200 according to the present application, the cells in the battery array 3 are bonded with adhesive, and the cells 100 are bonded together with adhesive, thereby saving space, reducing other structural components, satisfying weight reduction requirements, improving energy density, and improving production efficiency.

[0211] In one embodiment, the first panel 212 is a heat exchange plate 219 having an internal cooling structure, and a coolant is provided inside the heat exchange plate 219, which reduces the temperature of the cells 100 and allows the cells 100 to reach a suitable operating temperature. Since the heat exchange plate 219 and the cells 100 are provided with a thermal conduction plate 218, when the cells 100 are cooled with the coolant, the temperature difference at each position on the heat exchange plate 219 is equalized by the thermal conduction plate 218, and the temperature difference between the multiple cells 100 can be controlled to within 1°C.

[0212] 3, the cell body of the cell 100 is a prismatic cell having a rectangular structure, and has a length, a thickness, and a height between the length and the thickness. Each cell 100 is placed horizontally, with the longitudinal direction of the cell body of each cell 100 being the Y direction, the thickness direction being the X direction, and the height direction being the Z direction. Two adjacent cells 100 are arranged with their wide surfaces facing each other. In other words, the prismatic cell has a length L in the longitudinal direction, a thickness D in the thickness direction perpendicular to the longitudinal direction, and a height H in the height direction, with the height H being between the length L and the thickness D. The cell 100 has a wide side, a narrow side, and an end side. The wide side has a long side with the length L and a short side with the height H. The narrow side has a long side with the length L and a short side with the thickness D. The end side has a long side with the height H and a short side with the thickness D. Placing the cell 100 horizontally means that the two end faces of the cell 100 face the first side beam 201 and the second side beam 202, respectively, and the wide sides of two adjacent cells 100 face each other. In this way, the cell 100 functions as a substitute for a horizontal beam, and is more effective and stronger. In another embodiment, the cell 100 may be a cylindrical battery.

[0213] In the prior art, how to design the shape and dimensions of the cell 100 so as to have an appropriate battery capacity and a high heat dissipation effect is one of the problems to be solved in the technical field of batteries.

[0214] In one embodiment of the present application, the ratio of the length L to the thickness D of the battery body of the cell 100 satisfies the condition 23≦L / D≦208. With this ratio, a cell 100 that is long and thin can be obtained. Thus, even when the length of the cell 100 extends along the Y direction, it is possible to maintain an appropriate resistance value, a wide heat dissipation area, and high heat dissipation efficiency, making it highly adaptable to various vehicle models.

[0215] In another embodiment of the present application, the ratio of the length L to the height H of the battery body of the cell 100 satisfies the condition 4≦L / H≦21, and in some embodiments, satisfies the condition 9≦L / H≦13. This ratio may be achieved by the cell 100 having a long length and a thin thickness, or by adjusting the dimensions. By controlling the ratio of the length L to the height H of the battery body of the cell 100, it is possible to ensure that the length of the cell 100 extends along the Y direction and that it has a sufficient heat dissipation area, thereby ensuring the heat dissipation effect of the cell 100.

[0216] In the prior art, due to the short dimension L of a cell, both ends of the cell cannot be directly supported by side beams. The assembly process requires first arranging a plurality of cells to form a battery array 3, then providing end plates and / or side plates on the exterior of the battery array 3, which generally includes both end plates and side plates. The end plates and side plates are fixed together to enclose a space for accommodating the battery array 3, i.e., to form a battery module. The battery modules are then installed into the pack, and horizontal and / or vertical beams must be further provided in the battery pack to match the installation of the battery modules. This process makes the assembly relatively complicated, increasing the probability of defective products during the battery pack assembly process. Multiple assembly attempts increase the possibility of the battery pack becoming loose and not being installed firmly, which adversely affects the quality of the battery pack and reduces the stability and reliability of the battery pack.

[0217] Compared to the prior art, in this application, the dimension L of the cells is long and the cells are hard-case batteries that provide their own support. Therefore, when assembling the cells into a battery pack, one cell 100 is first placed horizontally in the tray, with a first end of the cell 100 supported by the first side beam 201 and the other end of the cell 100 supported by the second side beam 202. The other cells 100 are then inserted sequentially along the X direction of the battery pack to form the battery array 3. Then, fasteners are used to secure the battery array 3 and install the battery management components and power distribution components. The overall assembly process is relatively simple, eliminating the need to first assemble battery modules and then install the battery modules into the battery pack. The battery array 3 can be directly formed inside the battery pack, saving labor and material costs, reducing the defective rate, and improving the stability and reliability of the battery pack.

[0218] Of course, the present application may first assemble the cells into the battery array 3 and then install the battery array 3 in a battery pack, and such an embodiment is also within the scope of the claims of the present application.

[0219] As shown in FIG. 26, a second object of the present application is to provide a vehicle 1 including the battery pack 200.

[0220] The vehicle 1 may include electric vehicles such as commercial vehicles, special vehicles, electric bicycles, electric motorcycles, and electric scooters that require a battery pack to provide electric energy for driving.

[0221] In some embodiments, the battery pack 200 is mounted on the bottom of the electric vehicle, and the support member 4 is fixedly connected to the chassis of the vehicle 1. Since the chassis of an electric vehicle requires a large installation space, mounting the battery pack 200 on the chassis of the electric vehicle allows the number of cells 100 to be as large as possible, thereby improving the driving range of the electric vehicle.

[0222] In some embodiments, the vehicle includes a battery pack provided at the bottom of the vehicle, the battery pack being fixedly connected to the vehicle chassis, the Q direction (longitudinal direction of the smallest circumscribing rectangular parallelepiped of the cells) or the Y direction being the width direction of the vehicle body, i.e., the left-right direction of the vehicle, and the P direction (width direction of the smallest circumscribing rectangular parallelepiped of the cells) or the X direction being the longitudinal direction of the vehicle body, i.e., the front-rear direction of the vehicle. In other embodiments, the vehicle may include multiple battery packs provided at the bottom of the electric vehicle, the multiple battery packs may have the same or different shapes and dimensions, and each battery pack is adjustable according to the shape and dimensions of the chassis of the electric vehicle, and the multiple battery packs are arranged along the longitudinal direction of the vehicle body, i.e., the front-rear direction.

[0223] In some examples, in one embodiment according to the present application, the ratio of the width L3 of the battery pack 200 in the Q direction, the longitudinal direction of the smallest circumscribed rectangular parallelepiped of the cell, or the Y direction to the width W of the vehicle body satisfies the condition of 50%≦L3 / W≦80%. In this embodiment, this can be achieved by providing only one battery pack 200 along the width direction of the vehicle body. When there are multiple battery packs 200, the multiple battery packs 200 are arranged along the longitudinal direction of the vehicle body. Generally, for vehicles, the vehicle body width is 600 mm to 2000 mm, for example, 600 mm, 1600 mm, 1800 mm, or 2000 mm, and the vehicle body length is 500 mm to 5000 mm. For passenger cars, the passenger car width is generally 600 mm to 1800 mm, and the vehicle body length is 600 mm to 4000 mm.

[0224] In some embodiments, the ratio of the dimension L' of the cell 100 in the Q direction, the longitudinal direction of the smallest circumscribed rectangular parallelepiped of the cell, or the Y direction to the width W of the vehicle body satisfies the condition 46%≦L' / W≦76%. Considering the thicknesses of the first side beams 201 and the second side beams 202 of the battery pack 200, when the ratio of the dimension L of the cell 100 in the Y direction to the width W of the vehicle body satisfies the condition 46%≦L' / W≦76%, this embodiment can be realized by providing only one cell 100 along the width direction of the vehicle body. In other possible embodiments, if such dimensional requirements are met, this can be realized by providing multiple battery modules or multiple cells in the longitudinal direction. In one embodiment, the dimension of the cell 100 in the Y direction is 600 mm to 1500 mm.

[0225] Although some embodiments of the present application disclose technical means for fitting and supporting both ends of a single cell to the first and second side beams, in actual production, it may be impossible to manufacture cells with a length that matches the width of the vehicle body. That is, for some reason, it is not possible to process the cells to the desired length. Therefore, in the development of electric vehicles, based on the premise that the voltage plateau of the entire battery pack is generally constant, the volume of the battery pack is constant, and the material system used is constant, the voltage plateau of the cell is constant, the number of cells required in the battery pack is constant, and since the volume of the battery pack is constant, the volume of the cell is also constant, thus increasing the length of the cell reduces its thickness or width. On the other hand, the surface area of ​​the entire battery must be guaranteed to improve heat dissipation performance. Under this premise, reducing the width (height) of the cell does not allow the length of the cell to be increased. Furthermore, the use of vertical space in the vehicle body is limited. To minimize this impact, the width (height) of the cell is generally not adjusted. Therefore, the surface area of ​​the entire cell can only be changed by changing the length of the cell in the first direction and the thickness of the cell in the second direction, and therefore, when trying to increase the length, it is likely to be considered from the perspective of decreasing the thickness. In reality, a cell has a minimum limit on the change in thickness due to the need to add cells and related materials inside, and therefore the length of the cell is affected by the limit on the thickness, so the ability to change the length in the first direction is also limited, and the length of the cell cannot be increased infinitely.

[0226] The present application further discloses an energy storage device 2.

[0227] 27, the energy storage device 2 according to the present application includes the battery pack 200 according to any of the above embodiments. The energy storage device 2 according to the present application can be applied to a home backup power supply, a commercial backup power supply, an outdoor power supply, a peak adjustment energy storage facility at a power plant, a power supply for various vehicles, etc.

[0228] Although the embodiments of the present application have been described in detail above with reference to the drawings, the present application is not limited to the specific contents of the above embodiments, and various modifications can be made to the technical means of the present application within the scope of the technical idea of ​​the present application, and all of these simple modifications fall within the scope of protection of the present application.

[0229] It should be noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner if not contradictory, and in order to avoid unnecessary duplication, the present application does not separately describe all possible combinations.

[0230] Furthermore, various different embodiments of the present application may be combined in any manner, and should be considered as part of the application of the present application as long as such combination does not contradict the concept of the present application.

[0231] Below, explanations will be given using Comparative Example 1 and Examples 1-2, Comparative Example 2 and Examples 3-4, and Comparative Example 3 and Example 5. The battery pack 200 according to the examples of the present application is improved in terms of energy density, etc., by designing the arrangement and dimensional parameters of the cells 100.

[0232] The following examples and comparative examples all use a lithium iron phosphate battery as an example.

[0233] In Comparative Example 1, Example 1, and Example 2, the total volume of battery pack 200 is 213 L, the sum of the volumes occupied by the battery pack case, internal battery management system, and other power distribution modules is 82.54 L, the actual remaining volume of battery pack 200 that can accommodate cells 100 and / or first and second separators is 130.46 L, the battery pack case is 1380 mm long, 1005 mm wide, and 137 mm thick, the volume of the electrical box is 22.5 L, and the total volume of the battery pack is 213 L = 1380 × 1005 × 137 × 0.000001 + 22.5. (Comparative Example 1)

[0234] According to the conventional battery pack 200, as shown in FIG. 1, two horizontal beams 500 and one vertical beam 600 are provided inside the battery pack case, and the two horizontal beams 500 and one vertical beam 600 divide the single cells 100 into six battery modules 400. [Example]

[0235] 21 , in a battery pack 200 according to an embodiment of the present application, the longitudinal direction of the cell 100 is set to coincide with the width direction of the battery pack 200, and the plurality of cells 100 are arranged along the longitudinal direction of the battery pack 200, and a battery pack case accommodates one cell 100 in the width direction of the battery pack 200, and the cell 100 extends from one side to the other of the battery pack case in the width direction of the battery pack 200. One first separator 700 is provided in the battery pack case, and no second separator 800 is provided, and the first separator 700 extends along the width direction of the battery pack 200, and the plurality of cells 100 are arranged along the longitudinal direction of the battery pack 200 to form a battery array 400, and the first separator 700 divides the battery array 400 into two parts along the longitudinal direction of the battery pack 200. A first side beam 201 and a second side beam 202 of the battery pack case located on both sides of the battery pack 200 in the width direction provide a supporting force to the cells 100, and a third side beam 203 and a fourth side beam 204 of the battery pack case located on both ends of the battery pack 200 in the longitudinal direction provide an inward pressing force to the adjacent cells 100. A single layer of battery array 400 is contained within the battery pack case along the height direction of the battery pack 200. [Example]

[0236] 23 , in a battery pack 200 according to an embodiment of the present application, the longitudinal direction of the cell 100 is set to coincide with the width direction of the battery pack 200, and the plurality of cell 100 are arranged along the longitudinal direction of the battery pack 200. The battery pack case accommodates one cell 100 in the width direction of the battery pack 200, and the cell 100 extends from one side to the other of the battery pack case in the width direction of the battery pack 200. A first separator 700 and a second separator 800 are not provided inside the battery pack case. A first side beam 201 and a second side beam 202 of the battery pack case, which are located on both sides of the battery pack 200 in the width direction, provide support for the cell 100, and a third side beam 203 and a fourth side beam 204 of the battery pack case, which are located on both ends of the battery pack 200 in the longitudinal direction, provide an inward pressing force against the cell 100 adjacent thereto. Two layers of battery arrays 400 are contained in the battery pack case along the height direction of the battery pack 200 .

[0237] As can be seen by those skilled in the art by comparing the above Comparative Example 1 with Examples 1 to 3, compared to the battery pack 200 in the prior art, the battery pack 200 according to the examples of the present application can break through the limitations of the module formation rate of the conventional battery pack 200 by designing the arrangement, dimensional parameters, and other factors of the cells 100, and can achieve a higher energy density.

[0238] In Comparative Example 2, Example 3, and Example 4, the total volume of the battery pack 200 is 310 L, the sum of the volumes occupied by the battery pack case, the internal battery management system, and other power distribution modules is 90 L, the actual remaining volume of the battery pack that can accommodate the cells 100 and / or the first separator and the second separator is 220 L, the battery pack case is 1580 mm long, 1380 mm wide, and 137 mm thick, the volume of the electrical box is 11 L, and the total volume of the battery pack is 310 L = 1580 × 1380 × 137 × 0.000001 + 11. (Comparative Example 2)

[0239] The arrangement of the cells in the battery pack is the same as that in the first comparative example. [Example]

[0240] 20 , in a battery pack 200 according to an embodiment of the present application, the longitudinal direction of the cell 100 is set to coincide with the longitudinal direction of the battery pack 200, and the plurality of cells 100 are arranged along the width direction of the battery pack 200, and a battery pack case accommodates one cell 100 along the longitudinal direction of the battery pack 200, and the cell 100 extends from one side to the other of the battery pack case in the longitudinal direction of the battery pack 200. One second separator 800 is provided within the battery pack case, and no lateral beam 500 is provided. The second separator 800 extends along the longitudinal direction of the battery pack 200, and the plurality of cells 100 are arranged along the width direction of the battery pack 200 to form a battery array 400, and the second separator 800 divides the battery array 400 into two parts along the width direction of the battery pack 200. The third side beam 203 and the fourth side beam 204 of the battery pack case located at both ends in the longitudinal direction of the battery pack 200 provide a supporting force to the cells 100, and the first side beam 201 and the second side beam 202 of the battery pack case located on both sides in the width direction of the battery pack 200 provide an inward pressing force to the adjacent cells 100. Two layers of battery arrays 400 are included in the battery pack case along the height direction of the battery pack 200. [Example]

[0241] 24 , in a battery pack 200 according to an embodiment of the present application, the longitudinal direction of the cell 100 is set to coincide with the longitudinal direction of the battery pack 200, and the plurality of cell 100 are arranged along the width direction of the battery pack 200. A battery pack case accommodates one cell 100 along the longitudinal direction of the battery pack 200, and the cell 100 extends from one side to the other of the battery pack case along the longitudinal direction of the battery pack 200. A third side beam 203 and a fourth side beam 204 located on both ends of the battery pack case in the longitudinal direction of the battery pack 200 provide support for the cell 100, and a first side beam 201 and a second side beam 202 located on both sides of the battery pack case in the width direction of the battery pack 200 provide inward pressing force to the adjacent cell 100. A two-layer battery array 400 is included in the battery pack case along the height direction of the battery pack 200.

[0242] In Comparative Example 3 and Example 5, the total volume of the battery pack 200 is 414 L, the combined volume of the battery pack case, internal battery management system, and other power distribution modules is 102 L, the remaining volume of the battery pack that can actually accommodate the cells 100 is 312 L, the battery pack case is 2130 mm long, 1380 mm wide, and 137 mm thick, the volume of the electrical box is 11 L, and the total volume of the battery pack is 414 L = 2130 × 1380 × 137 × 0.000001 + 11. (Comparative Example 3)

[0243] The arrangement of the cells was the same as that in Comparative Example 1. [Example]

[0244] The arrangement of the cells in the battery pack is the same as that in the fourth embodiment. [Example]

[0245] In this embodiment, the total volume of the battery pack 200 is 508 L, the combined volume of the battery pack case, internal battery management system, and other power distribution modules is 119 L, the remaining volume of the battery pack that can actually accommodate the cells 100 is 389 L, the battery pack case is 2630 mm long, 1380 mm wide, and 137 mm thick, the volume of the electrical box is 11 L, and the total volume of the battery pack is 414 L = 2630 x 1380 x 137 x 0.000001 + 11. The arrangement of the cells in the battery pack is the same as that in Example 4.

[0246] Table 1 shows specific parameters for Examples 1 to 6 and Comparative Examples 1 and 2.

[0247] [Table 1]

[0248] Below, explanations will be given using Comparative Example 4 and Examples 7 to 10. The battery pack 200 according to the examples of the present application is improved in terms of heat dissipation effect by designing the dimensional parameters of the cells 100 and the like.

[0249] The cells in Comparative Example 4 and Examples 7 to 10 were fast-charged at a rate of 2C, and the temperature rise of the cells during the fast-charging process was measured. Table 2 below records the selection of parameters for the length, width, thickness, volume, surface area, and energy of the cells in each Example and Comparative Example, as well as the specific temperature rise.

[0250] [Table 2]

[0251] As can be seen from the data in the table, the cell 100 according to the present application reduces the temperature rise to a different extent compared to the comparative example when fast charged under the same conditions, and has a better heat dissipation effect than the prior art. When the cell 100 is assembled into a battery pack, the temperature rise of the battery pack is also reduced compared to the cell.

[0252] As can be seen by those skilled in the art by comparing the above comparative examples with the examples, the battery pack 200 according to the examples of the present application can achieve a higher energy density by designing the arrangement, dimensional parameters, and other factors of the cells 100 to break through the limitations of the conventional battery pack 200 in terms of space utilization. This improvement in energy density is magnified as the overall volume of the battery pack 200 increases; that is, the larger the volume of the battery pack 200, the more significant the effect of improving energy density achieved by the technical means of the examples of the present application.

[0253] In the description herein, reference to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in combination with the example or example are included in at least one example or example of the present application. In the description herein, the exemplary expressions of the above terms do not necessarily refer to the same example or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined as appropriate in any one or more examples or examples.

[0254] Although the embodiments of the present application have been illustrated and described, as will be understood by those skilled in the art, various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is limited by the claims and their equivalents. [Explanation of symbols]

[0255] 1. Vehicle; 2. Energy storage device 3 Battery array; 4 Support member 100 battery; 101 first electrode terminal 102 second electrode terminal; 103 explosion-proof valve 200 battery pack; 201 first side beam 202 second side beam; 203 third side beam 204 fourth side beam; 205 first elastic device 206 second elastic device; 207 first end plate 208 second end plate; 209 first side plate 210 second side panel; 211 second panel 212 first panel; 213 first support plate 214 second support plate; 215 first connecting surface 216 second connecting surface; 217 thermal insulation layer 218 Heat conduction plate; 219 Heat exchange plate 221 intake port; 222 exhaust passage 235 fourth connecting surface; 236 third connecting surface 233 second connecting plate; 234 side plate body 232 first connecting plate; 231 end plate body 700 First separator; 800 Second separator 300 chamber; 301 first side wall 302 second side wall; 305 bottom of chamber 400 battery modules; 500 transverse beams 501 First beam; 502 Second beam 600 Longitudinal beam L Dimension of the cell along the Y direction D Dimension along the X direction of the cell H Dimension of the cell along the Z direction L1: The distance between the first and second ends of the cell L2: Distance between the inner surface of the first side beam and the inner surface of the second side beam / distance along the first direction between the first side wall and the second side wall L3 Battery pack width in Y direction

Claims

1. a battery array and a support member; the battery array includes a plurality of unit cells, each unit cell having a first dimension that is a maximum value of a pitch between two parallel planes that virtually sandwich the unit cell; a battery pack, wherein at least one battery satisfies a condition of 600 mm≦first dimension≦2500 mm, and includes a case and a pole core located within the case, wherein a support region is formed in the case, and the battery is supported by the support member by being in contact with the support member via the support region.

2. 2. The battery pack according to claim 1, wherein the unit cell has a second dimension that is a minimum value of a pitch between two parallel planes that virtually sandwich the unit cell, a normal direction of the two parallel planes that corresponds to the second dimension is a P direction, and the plurality of unit cells are arranged along the P direction of the at least one unit cell.

3. 3. The battery pack according to claim 2, wherein the at least one cell satisfies the condition: 10≦first dimension / second dimension≦208.

4. 4. The battery pack according to claim 3, wherein the at least one cell satisfies the condition: 23≦first dimension / second dimension≦208.

5. 5. The battery pack according to claim 4, wherein the at least one cell satisfies the condition: 50≦first dimension / second dimension≦70.

6. The battery pack according to claim 1 , wherein the case includes a case body and a cover plate that seals the case body.

7. The battery pack according to claim 6, wherein the case body is made of aluminum or steel.

8. 2. The battery pack according to claim 1, wherein the at least one cell satisfies the condition: 600 mm≦first dimension≦1500 mm.

9. 9. The battery pack according to claim 8, wherein the at least one cell satisfies the condition: 600 mm≦first dimension≦1000 mm.

10. The cell has a volume V, and the at least one cell has a volume of 0.0005 mm －２ ≦first dimension / V≦0.002 mm －２ 2. The battery pack according to claim 1, wherein the above condition is satisfied.

11. The cell has a volume V and a surface area S, and the at least one cell has a surface area of ​​0.1 mm －１ ≦S / V≦0.35mm －１ 2. The battery pack according to claim 1, wherein the above condition is satisfied.

12. 2. The battery pack according to claim 1, wherein the at least one unit cell has a first end and a second end along a first dimension direction, at least one of the first end and the second end has an electrode terminal that draws out an internal current of the unit cell, and the electrode terminals between the unit cells are electrically connected by a connecting member.

13. 2. The battery pack according to claim 1, further comprising two side plate members provided on opposite sides of the battery array to sandwich the battery array.

14. 2. The battery pack according to claim 1, wherein a normal direction of the two parallel planes corresponding to the first dimension is a Q direction, the battery pack includes a vehicle tray, the vehicle tray includes a first side beam and a second side beam that are provided opposite each other along the Q direction, the support members are the first side beam and the second side beam, and both ends of the unit cells are supported by the first side beam and the second side beam, respectively.

15. The battery pack according to claim 1 , wherein the support members are a plurality of bottom beams, and the bottom beams are located below the battery array.

16. 16. The battery pack according to claim 15, wherein a normal direction of the two parallel planes corresponding to the first dimension is a Q direction, the bottom beam includes a first beam and a second beam located on the first beam and intersecting the first beam, an angle formed between an extension direction of the first beam and the Q direction is 60 to 90 degrees, and the unit cells are supported by the first beam.

17. 16. The battery pack according to claim 15, wherein a normal direction of the two parallel planes corresponding to the first dimension is a Q direction, the bottom beams are a plurality of rectangular beams arranged in parallel and spaced apart, an angle formed between an extension direction of the rectangular beams and the Q direction is 60 to 90 degrees, and the unit cells are supported by the rectangular beams.

18. 2. The battery pack according to claim 1, wherein the support member is a chassis of an automobile, and the battery array is located on the chassis of the automobile.

19. 2. The battery pack according to claim 1, wherein a normal direction of the two parallel planes corresponding to the first dimension is a Q direction, a battery mounting area is formed within the battery pack, the battery array is located in the battery mounting area, the battery pack includes one battery array, and the single battery extends from one side of the battery mounting area to the other side of the battery mounting area along the Q direction.

20. The battery pack according to claim 19, wherein the battery pack accommodates only one of the unit cells in the Q direction.

21. 2. The battery pack according to claim 1, wherein the single cells have a second dimension that is the minimum value of the pitch between two parallel planes that virtually sandwich the single cells, a normal direction of the two parallel planes that corresponds to the second dimension is a P direction, a battery mounting area is formed within the battery pack, the battery array is located in the battery mounting area, the battery pack includes N (N is 1 or more) battery arrays along the P direction, and the battery arrays are electrically connected to each other by connecting members between electrode terminals of the single cells.

22. 2. The battery pack according to claim 1, wherein a normal direction of the two parallel planes corresponding to the first dimension is a Q direction, a battery mounting area is formed within the battery pack, the battery array is located in the battery mounting area, the battery pack includes M (M is 1 or more) battery arrays arranged along the Q direction, and the battery arrays are electrically connected to each other by connecting members between electrode terminals of single cells.

23. a battery array and a support member, the battery array including a plurality of unit cells, each unit cell having a dimension A that is the length of a smallest circumscribed rectangular parallelepiped of the unit cell; a battery pack, wherein at least one unit cell satisfies the condition of 600 mm≦dimension A≦2500 mm, and includes a case and a pole core located within the case, wherein a support region is formed in the case, and the unit cell abuts against the support member by the support region and is supported by the support member.

24. 24. The battery pack according to claim 23, wherein the plurality of unit cells are arranged along a K direction, and the K direction is a width direction of a smallest circumscribing rectangular parallelepiped of the at least one unit cell in the battery array.

25. 25. The battery pack according to claim 24, wherein the unit cells have a dimension B that is a width of a smallest circumscribed rectangular parallelepiped of the unit cells, and the at least one unit cell satisfies the condition of 10≦dimension A / dimension B≦208.

26. 26. The battery pack according to claim 25, wherein the at least one cell satisfies the condition: 23≦dimension A / dimension B≦208.

27. 27. The battery pack according to claim 26, wherein the at least one cell satisfies the condition: 50≦dimension A / dimension B≦70.

28. 24. The battery pack according to claim 23, wherein the plurality of unit cells are arranged along a K direction, and the K direction is a height direction of a smallest circumscribed rectangular parallelepiped of the at least one unit cell in the battery array.

29. 29. The battery pack of claim 28, wherein the unit cells have a dimension C that is the height of a smallest circumscribed rectangular parallelepiped of the unit cells, and the at least one unit cell satisfies the condition: 10≦dimension A / dimension C≦208.

30. 30. The battery pack according to claim 29, wherein the at least one cell satisfies the condition: 23≦dimension A / dimension C≦208.

31. 31. The battery pack according to claim 30, wherein the at least one cell satisfies the condition: 50≦dimension A / dimension C≦70.

32. The battery pack according to claim 23, wherein the case includes a case body and a cover plate that seals the case body.

33. 33. The battery pack according to claim 32, wherein the case body is made of aluminum or steel.

34. 24. The battery pack according to claim 23, wherein the at least one cell satisfies the condition: 600 mm≦dimension A≦1500 mm.

35. 35. The battery pack according to claim 34, wherein the at least one cell satisfies the condition: 600 mm≦dimension A≦1000 mm.

36. 24. The battery pack according to claim 23, further comprising two side plate members provided on opposite sides of the battery array to sandwich the battery array.

37. 24. The battery pack according to claim 23, wherein the battery pack includes a vehicle tray, the vehicle tray includes a first side beam and a second side beam that are provided opposite each other along a longitudinal direction of a minimum circumscribing rectangular parallelepiped of the at least one unit cell, the support members are the first side beam and the second side beam, and both ends of the at least one unit cell are supported by the first side beam and the second side beam, respectively.

38. 24. The battery pack according to claim 23, wherein the support members are a plurality of bottom beams, and the bottom beams are located below the battery array.

39. 39. The battery pack of claim 38, wherein the bottom beam includes a first beam and a second beam located on the first beam and intersecting the first beam, an angle formed between an extension direction of the first beam and a longitudinal direction of a smallest circumscribed rectangular parallelepiped of the at least one unit cell is 60 to 90 degrees, and the at least one unit cell is supported by the first beam.

40. The battery pack of claim 38, wherein the bottom beams are a plurality of rectangular beams arranged in parallel and spaced apart, an angle formed between the extension direction of the rectangular beams and the longitudinal direction of the smallest circumscribed rectangular parallelepiped of the unit cell is 60 to 90 degrees, and the at least one unit cell is supported by the rectangular beams.

41. 24. The battery pack according to claim 23, wherein the support member is a chassis of an automobile, and the battery array is located on the chassis of the automobile.

42. 24. The battery pack according to claim 23, wherein a battery mounting area is formed within the battery pack, the battery array is located in the battery mounting area, the battery pack includes one battery array, and the single battery extends from one side of the battery mounting area to the other side of the battery mounting area along a longitudinal direction of a smallest circumscribed rectangular parallelepiped of the at least one single battery.

43. 43. The battery pack according to claim 42, wherein the battery pack accommodates only one of the cells in the longitudinal direction of the smallest circumscribing rectangular parallelepiped of the at least one cell.

44. 24. The battery pack according to claim 23, wherein a battery mounting area is formed within the battery pack, the battery array is located in the battery mounting area, the battery pack includes N (N is 1 or more) battery arrays arranged along a width direction of a smallest circumscribed rectangular parallelepiped of the unit cells, and the battery arrays are electrically connected to each other by connecting members between electrode terminals of the unit cells.

45. 24. The battery pack according to claim 23, wherein a battery mounting area is formed within the battery pack, the battery array is located in the battery mounting area, the battery pack includes M (M is 1 or more) battery arrays arranged along a longitudinal direction of a smallest circumscribed rectangular parallelepiped of the at least one electric cell, and the battery arrays are electrically connected to each other by connecting members between electrode terminals of the electric cells.

46. 24. The battery pack according to claim 23, wherein a battery mounting area is formed within the battery pack, the battery array is located in the battery mounting area, the battery pack includes J (J is 1 or more) battery arrays arranged along a height direction of a smallest circumscribed rectangular parallelepiped of the single cells, and the battery arrays are electrically connected to each other by connecting members between electrode terminals of the single cells.

47. A battery pack including a battery array and a support member, the battery array includes a plurality of cells; At least one cell includes a battery body and an electrode terminal extending from the battery body to draw an internal current from the battery body; the battery body is a substantially rectangular parallelepiped with a length L, and satisfies the condition of 600 mm≦L≦2500 mm; the at least one battery cell further includes a case and a pole core located in the case, a support region is formed in the case, and the battery cell abuts against the support member via the support region and is supported by the support member; Battery pack.

48. The battery body has a thickness D and a height H, with the thickness direction being the X direction, the longitudinal direction being the Y direction, and the height direction being the Z direction.

48. The battery pack of claim 47.

49. the plurality of cells are arranged along an X direction of the at least one cell in the battery array; 49. The battery pack of claim 48.

50. The at least one cell satisfies the condition of 10≦L / D≦208.

50. The battery pack of claim 49.

51. The at least one cell satisfies the condition 23≦L / D≦208.

51. The battery pack of claim 50.

52. The at least one cell satisfies the condition of 50≦L / D≦70.

52. The battery pack of claim 51.

53. the plurality of cells are arranged along the Z direction of the at least one cell in the battery array.

49. The battery pack of claim 48.

54. The at least one battery cell satisfies the condition of 10≦L / H≦208.

54. The battery pack of claim 53.

55. The at least one battery satisfies the condition 23≦L / H≦208.

55. The battery pack of claim 54.

56. 56. The battery pack according to claim 55, wherein the at least one cell satisfies the condition of 50≦L / H≦70.

57. The volume of the cell is V, and the at least one cell has a volume of 0.0005 mm －２ ≦L / V≦0.002mm －２ Meet the conditions of 48. The battery pack of claim 47.

58. The at least one cell satisfies the condition of 600 mm≦L≦1500 mm.

48. The battery pack of claim 47.

59. The at least one cell satisfies the condition of 600 mm≦L≦1000 mm.

59. The battery pack of claim 58.

60. the battery body has a thickness D and a height H, a thickness direction being the X direction, a longitudinal direction being the Y direction, and a height direction being the Z direction, the height H of the battery body being equal to or greater than the thickness D of the battery body, the at least one unit cell satisfying the conditions of 23≦L / D≦208 and 4≦L / H≦21, and the plurality of unit cells being arranged along the X direction of at least one of the unit cells in the battery array; 59. The battery pack of claim 58.

61. The at least one cell satisfies the condition 9≦L / H≦13.

61. The battery pack of claim 60.

62. the at least one unit cell has a first end and a second end along the Y direction, at least one of the first end and the second end has an electrode terminal that draws out an internal current of the unit cell, and the electrode terminals between the unit cells are electrically connected by a connecting member; 59. The battery pack of claim 58.

63. The battery body has a volume V and a surface area S, and the relationship between the surface area S and the volume V is 0.1 mm －１ ≦S / V≦0.35mm －１ That is, 59. The battery pack of claim 58.

64. the battery pack further includes two side plate members that are provided on both sides of the battery array in opposition to each other along the X direction and that sandwich the battery array therebetween.

61. The battery pack of claim 60.

65. the battery pack includes a vehicle tray, the vehicle tray including a first side beam and a second side beam provided opposite each other along a Y direction; the first side beam and the second side beam are the support members, 61. The battery pack of claim 60, wherein both ends of the cell are supported by the first side beam and the second side beam, respectively.

66. the first side beam and the second side beam each include an inner wall surface aligned with two end surfaces of the battery cell, and an insulating plate is sandwiched between the inner wall surfaces of the first side beam and the second side beam and the end surfaces of the battery cell.

66. The battery pack of claim 65.

67. the tray includes a bottom plate, the first side beam and the second side beam are provided at both ends of the bottom plate, respectively, and the unit cell and the bottom plate are provided at a distance from each other.

66. The battery pack of claim 65.

68. 68. The battery pack according to claim 67, wherein a heat insulating layer is provided between the cell and the bottom plate.

69. The battery pack further includes a sealing cover that, together with the tray, forms a chamber for accommodating the battery array.

68. The battery pack of claim 67.

70. an inner wall surface of the first side beam facing the unit cell has a protruding first support plate, a surface of the first support plate facing the sealing cover is provided with a first support surface, and a surface of the first support plate facing away from the sealing cover is provided with a first mounting surface; an inner wall surface of the second side beam facing the unit cell has a protruding second support plate, a surface of the second support plate facing the sealing cover is provided with a second support surface, and a surface of the second support plate facing away from the sealing cover is provided with a second mounting surface; the first support surface and the second support surface are for supporting a battery cell, and the first mounting surface and the second mounting surface are for mounting the bottom plate.

70. The battery pack of claim 69.

71. an inner wall surface of the first side beam facing the cell has a first connection surface; a distance from the first connection surface to the sealing cover is smaller than a distance from the first support surface to the sealing cover; an inner wall surface of the second side beam facing the cell has a second connection surface; a distance from the second connection surface to the sealing cover is smaller than a distance from the second support surface to the sealing cover; Both ends of the battery are in contact with the first connection surface and the second connection surface, respectively.

71. The battery pack of claim 70.

72. an inner wall surface of the first side beam facing the cell has a step structure with at least two steps, and surfaces of the two steps facing the sealing cover form the first connection surface and the first support surface, respectively; an inner wall surface of the second side beam facing the cell has a step structure with at least two steps, and surfaces of the two steps facing the sealing cover form the second connection surface and the second support surface, respectively; 72. The battery pack of claim 71.

73. the battery further includes a first end plate and a second end plate, the first end plate being disposed between the first end of the at least one cell and the first side beam, the second end plate being disposed between the second end of the at least one cell and the second side beam, the first end of the at least one cell being connected to the first connection surface via the first end plate, and the second end of the at least one cell being connected to the second connection surface via the second end plate.

72. The battery pack of claim 71.

74. the first end plate includes an end plate body provided opposite an end surface of the battery cell, and a first connecting plate connected to the end plate body and protruding toward the first side beam, the second end plate includes an end plate body provided opposite to an end surface of the battery cell, and a first connection plate connected to the end plate body and protruding toward the second side beam, and the first connection plate is connected to the first connection surface and the second connection surface.

74. The battery pack of claim 73.

75. an explosion-proof valve is provided at a first end of at least one of the electric cells; an exhaust passage is provided inside the first side beam; and an exhaust hole is provided in the first side beam at a position corresponding to the explosion-proof valve, the exhaust hole being in communication with the exhaust passage; an explosion-proof valve is provided at a second end of the battery cell; an exhaust passage is provided inside the second side beam; an exhaust hole is provided in the second side beam at a position corresponding to the explosion-proof valve; the exhaust hole is in communication with the exhaust passage; and an exhaust port in communication with the exhaust passage is provided in the battery pack. The battery pack according to any one of claims 65 to 74.

76. 70. The battery pack of claim 69, wherein the tray further includes third and fourth side beams arranged opposite each other along the X direction, the third and fourth side beams providing a pressing force to the battery array.

77. 75. The battery pack of claim 74, wherein a management accommodation chamber for accommodating battery management components and power distribution components is defined between the first connection surface, the second connection surface, the cell, and the sealing cover.

78. the battery pack further includes a first elastic device and / or a second elastic device, the first elastic device being elastically sandwiched between the third side beam and a battery cell adjacent to the third side beam, and the second elastic device being elastically sandwiched between the fourth side beam and a battery cell adjacent to the fourth side beam.

77. The battery pack of claim 76.

79. further including a first side panel and / or a second side panel; the first side plate is disposed between the third side beam and a cell adjacent to the third side beam; the second side plate is disposed between the fourth side beam and the cell adjacent to the fourth side beam.

77. The battery pack of claim 76.

80. the first side plate includes a side plate body provided to face a side surface of the unit cell, and a second connecting plate connected to the side plate body and protruding toward the third side beam, the second side plate includes a side plate body provided to face a side surface of the unit cell, and a second connecting plate connected to the side plate body and protruding toward the fourth side beam, the third side beam is provided with a third connection surface facing the sealing cover, and the fourth side beam is provided with a fourth connection surface facing the sealing cover; 80. The battery pack of claim 79, wherein the first side plate is connected to the third connection surface by a corresponding second connection plate, and the second side plate is connected to the fourth connection surface by a corresponding second connection plate.

81. a first panel and a second panel connected to upper and lower surfaces of at least some of the plurality of cells, respectively; a first end plate and a second end plate provided on two end surfaces of at least some of the plurality of unit cells, respectively; a first side plate and a second side plate provided on the outside of the two outermost cells, respectively; further comprising the first end plate, the second end plate, the first side plate, and the second side plate are all connected to the first panel and the second panel; an inner wall surface of the first side beam facing the cell has a first support surface and a first connection surface, an inner wall surface of the second side beam facing the cell has a second support surface and a second connection surface, the first end of the cell is supported on the first support surface, the second end of the cell is supported on the second support surface, the first end plate is connected to the first connection surface, and the second end plate is connected to the second connection surface; an inner wall surface of the third side beam facing the battery cell has a third connection surface, an inner wall surface of the fourth side beam facing the battery cell has a fourth connection surface, the first side plate is connected to the third connection surface, and the second side plate is connected to the fourth connection surface; 77. The battery pack of claim 76.

82. The battery pack according to any one of claims 48 to 63, wherein the support members are a plurality of bottom beams, and the bottom beams are located below the battery array.

83. the bottom beam includes a first beam and a second beam located on the first beam and intersecting the first beam, an angle formed between an extension direction of the first beam and a Y direction is 60 to 90 degrees, and the unit cell is supported by the first beam; 83. The battery pack of claim 82.

84. There are two second beams, and the two second beams are located at both ends of the first beam, respectively, and are perpendicular to the first beam, and the unit cells are supported by the first beams.

84. The battery pack of claim 83.

85. The center of the cell is located on the first beam.

85. The battery pack of claim 84.

86. The bottom beams are a plurality of rectangular beams arranged in parallel and spaced apart, and the angle between the extension direction of the rectangular beams and the Y direction is 60 to 90 degrees, and the unit cells are supported by the rectangular beams.

83. The battery pack of claim 82.

87. The rectangular beams are uniformly arranged along the Y direction, and the extension direction of the rectangular beams is perpendicular to the Y direction.

87. The battery pack of claim 86.

88. the support member is a chassis of an automobile, and the battery array is located on the chassis of the automobile; The battery pack according to any one of claims 47 to 63.

89. a battery mounting area is formed in the battery pack, a battery array is located in the battery mounting area, the battery pack includes one battery array, and a single battery extends from one side of the battery mounting area to the other side of the battery mounting area along a Y direction; The battery pack according to any one of claims 48 to 74, 76 to 81, or 83 to 87.

90. The battery pack accommodates only one of the cells in the Y direction.

90. The battery pack of claim 89.

91. The cells are arranged in the X direction from one end to the other end of the battery mounting area.

90. The battery pack of claim 89.

92. a battery mounting area is formed within the battery pack, the front battery array is located in the battery mounting area, N battery arrays (N is 1 or more) are provided along the X direction in the battery mounting area, and the battery arrays are electrically connected to each other by connection members between electrode terminals of the unit cells; The battery pack according to any one of claims 47 to 74, 76 to 81, or 83 to 87.

93. an electrode terminal of the last cell in the (N-1)th battery array is connected to an electrode terminal of the first cell in the Nth battery array by a connecting member; 93. The battery pack of claim 92.

94. a battery mounting area is formed within the battery pack, the battery array is located in the battery mounting area, the battery pack includes M battery arrays (M is 1 or more) arranged along a Y direction, and the battery arrays are electrically connected to each other by connection members between electrode terminals of the unit cells; The battery pack according to any one of claims 48 to 74, 76 to 81, or 83 to 87.

95. an electrode terminal of the last cell in the (M-1)th battery array and an electrode terminal of the first cell in the Mth battery array are connected by a connecting member; 95. The battery pack of claim 94.

96. a battery mounting area is formed within the battery pack, a battery array is located in the battery mounting area, the battery pack includes N battery arrays (N is 1 or more) arranged along the X direction and M battery arrays (M is 1 or more) arranged along the Y direction, and the battery arrays are electrically connected to each other by connecting members between electrode terminals of the unit cells; The battery pack according to any one of claims 48 to 74, 76 to 81, or 83 to 87.

97. a battery mounting area is formed within the battery pack, a battery array is located in the battery mounting area, the battery pack includes J battery arrays (J is 1 or more) arranged along a Z direction, and the battery arrays are electrically connected to each other by connection members between electrode terminals of the unit cells; The battery pack according to any one of claims 47 to 74, 76 to 81, or 83 to 87.

98. The number of cells in the battery array is 60 to 200.

48. The battery pack of claim 47.

99. The number of cells in the battery array is 80 to 150.

99. The battery pack of claim 98.

100. At least some of the cells in the battery array are bonded with an adhesive.

48. The battery pack of claim 47.

101. Further comprising a heat exchange plate attached to an upper surface of the battery array.

48. The battery pack of claim 47.

102. The volume of the battery body is V, and the relationship between the height H of the battery body and the corresponding volume V of the battery body is 0.0001 mm －２ ≦H / V≦0.00015mm －２ That is, 49. The battery pack of claim 48.

103. A vehicle comprising the battery pack according to any one of claims 1 to 102.

104. The battery pack is provided at the bottom of the vehicle, and the support member is fixedly connected to a chassis of the vehicle.

104. The vehicle of claim 103.

105. the vehicle includes one battery pack provided at the bottom of the vehicle, and the Q direction, the longitudinal direction of the smallest circumscribing rectangular parallelepiped of the unit cells, or the Y direction, is arranged along the vehicle body width direction of the vehicle, and the P direction, the width direction of the smallest circumscribing rectangular parallelepiped of the unit cells, or the X direction, is arranged along the vehicle body longitudinal direction of the vehicle.

105. A vehicle according to claim 103 or 104.

106. a width L3 of the battery pack in the Q direction, a width L3 of the battery cell in the longitudinal direction or Y direction of the smallest circumscribing rectangular parallelepiped, and a width W of the vehicle body satisfy the condition of 50%≦L3 / W≦80%; 106. The vehicle of claim 105.

107. a dimension L' of the cell in the Q direction, a dimension L' of the cell in the longitudinal direction or Y direction of the smallest circumscribing rectangular parallelepiped, and a width W of the vehicle body satisfy the condition of 46%≦L' / W≦76%; 106. The vehicle of claim 105.

108. The width W of the vehicle body is 600 mm to 2000 mm.

105. The vehicle of claim 104.

109. A battery pack according to any one of claims 1 to 102, Energy storage device.

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