Power battery pack and electric vehicle

Abstract

To provide a power battery pack having advantages such as high space utilization, large energy density, strong cruising capability, high reliability, low cost, and high quality.SOLUTION: The power battery pack includes a pack body and a plurality of battery cells directly disposed and arranged in the pack body. The battery cell extends from a first side of the pack main body to a second side of the pack main body, the first side and the second side are disposed opposite to each other, a first side wall is disposed on the first side of the pack main body, and a second side wall is disposed on the second side of the pack main body. One end of the battery cell is supported by the first side wall, and the other end is supported by the second side wall.SELECTED DRAWING: Figure 14

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 relates to the technical field of batteries, and in particular to a power battery pack and an electric vehicle having the power battery pack. [Background technology]

[0003] In the prior art, for example, a power battery pack applied to an electric vehicle mainly includes a pack body and a plurality of battery modules mounted in the pack body, each of which is composed of a plurality of unit cells.

[0004] As users' demands for the driving range of electric vehicles gradually increase, if the space underneath 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 demand, which has also become an important factor restricting the development of electric vehicles. Summary of the Invention [Problem to be solved by the invention]

[0005] In related prior art, as shown in FIG. 1 , a pack body 200″ of a power battery pack 10′ is often divided into mounting areas for multiple battery modules 400′ by transverse cross beams 500′ and longitudinal cross beams 600′. For example, in the battery pack disclosed in CN107925028A, the battery modules 400′ are fixed to the transverse cross beams 500′ or longitudinal cross beams 600′ by means of screws or other methods. The battery module 400′ includes a plurality of cells arranged in sequence to form a battery array. End plates and / or side plates are provided on the exterior of the battery array. Typically, the end plates and side plates are both fixed together to enclose a space that accommodates the battery array. At the same time, the end plates and side plates are connected by screws or other connecting members such as tie rods to secure the battery array.

[0006] The inventors have found through testing and analysis that if the battery modules 400' are fixed to the transverse cross beams 500' or the longitudinal cross beams 600' using structures such as screws, space will be wasted and the weight will increase due to the increased number of connecting members such as screws. Furthermore, because the battery modules 400' are designed with end plates and side plates, each of which has a certain thickness and height, the internal space of the pack body 200'' will be wasted and the volume utilization rate of the pack body 200'' will be low. Generally, in the power battery pack 10' of the above-mentioned prior art, the ratio of the sum of the volumes of the cells in the pack body 200'' to the volume of the pack body 200'' is about 50%, and even as low as 40%.

[0007] In the power battery pack 10' according to the above-mentioned prior art embodiment, the end plates and side plates of the battery modules 400' and the internal connection and mounting configuration of the power battery pack 10' all reduce the utilization rate of the internal space of the pack body 200'', resulting in a power battery pack 10' with a too low ratio between the sum of the cell volumes and the pack body 200'', making its energy density unable to meet the ever-increasing demands for electric vehicle driving range, which has become a major factor restricting the development of electric vehicles. Furthermore, the assembly process is complicated, requiring the battery modules to be assembled first and then installed into the pack body, which increases the labor and material costs. At the same time, the need for multiple assembly steps increases the probability of defective products during the assembly of the power battery pack. Multiple assembly steps increase the possibility of the power battery pack becoming loose and not being firmly installed, which adversely affects the quality of the power battery pack and reduces the stability of the power battery pack. This reduces the reliability and reliability of the system.

[0008] The present application aims to solve at least one of the technical problems in the prior art, and therefore aims to provide a power battery pack with advantages such as high space utilization, high energy density, long range, high reliability, low cost, and high quality.

[0009] The present application further provides an electric vehicle having the power battery pack. [Means for solving the problem]

[0010] A power battery pack according to an embodiment of the first aspect of the present application includes a pack body and a plurality of unit cells arranged directly within the pack body, the unit cells extending from a first side of the pack body to a second side of the pack body, the first side and the second side being opposite each other, a first side wall being provided on the first side of the pack body and a second side wall being provided on the second side, one end of the unit cell being supported by the first side wall and the other end being supported by the second side wall.

[0011] The power battery pack of the present application directly arranges and arranges multiple cells within the pack body, eliminating the various mounting structures required for attaching battery modules in conventional battery packs. This improves the utilization of the internal space of the pack body and increases the sum of the cell volumes within the pack body. In other words, it increases the ratio of the cell volume to the pack body volume, allowing more cells to be assembled within a given volumetric space, thereby improving the energy density of the power battery pack. At the same time, the assembly process is simplified, reducing labor and material costs. The reduced assembly steps reduce the probability of defective products and the likelihood of loosening or insufficient mounting during the power battery pack assembly process, improving the quality of the power battery pack and improving the stability and reliability of the battery pack. Furthermore, each cell is supported at one end by a first side wall and at the other end by a second side wall. The cell itself is supported by the first and second side walls as a support structure, thereby supporting its own gravity, eliminating the various mounting structures required for attaching battery modules in conventional battery packs.

[0012] An electric vehicle according to an embodiment of the second aspect of the present application includes the power battery pack according to the embodiment of the first aspect of the present application. [Effects of the Invention]

[0013] The electric vehicle according to the embodiment of the present application can improve its driving range without increasing the space occupied by the battery by utilizing the power battery pack described in the embodiment of the first aspect of the present application. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is an exploded view of a power battery pack in the prior art. [Figure 2] 1 is a cross-sectional view of a power battery pack according to an embodiment of the present application. [Figure 3] 1 is a perspective view of a power battery pack according to an embodiment of the present application; [Figure 4]FIG. 1 is an exploded view of a power battery pack according to an embodiment of the present application. [Figure 5] FIG. 1 is a schematic diagram illustrating the configuration of a cell according to an embodiment of the present invention. [Figure 6] 1 is a schematic diagram of a battery array arrangement of a power battery pack according to an embodiment of the present application; [Figure 7] FIG. 10 is a schematic diagram of a battery array arrangement of a power battery pack according to another embodiment of the present application. [Figure 8] 1 is a schematic diagram illustrating a configuration in which a pack body of a power battery pack according to an embodiment of the present application is formed in an electric vehicle. [Figure 9] 1 is a schematic diagram of an electric vehicle according to an embodiment of the present invention; [Figure 10] 1 is an exploded view of an electric vehicle according to an embodiment of the present application. [Figure 11] FIG. 3 is an enlarged view of region G in FIG. 2. [Figure 12] FIG. 1 is a perspective view of a power battery pack according to a first alternative embodiment of the present application. [Figure 13] FIG. 1 is a perspective view of a power battery pack according to a second alternative embodiment of the present application. [Figure 14] FIG. 10 is a perspective view of a power battery pack according to a third alternative embodiment of the present application. [Figure 15] FIG. 10 is a perspective view of a power battery pack according to a fourth alternative embodiment of the present application. [Figure 16] FIG. 10 is a perspective view of a power battery pack according to a fifth alternative embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, the embodiments of the present application will be described in detail, and 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.

[0016] In addition, in the description of this application, the orientations or positional relationships indicated by terms such as "vertical direction," "horizontal direction," "length," "width," "thickness," "inside," and "outside" are based on the orientations or positional relationships shown in the drawings, and are intended merely to facilitate and simplify the description of this application. They do not indicate or suggest that the devices or components shown must have a specific orientation and be configured and operate in a specific orientation, and therefore should not be understood as limiting this application.

[0017] Also, in the description of this application, "plurality" means two or more.

[0018] Considering the current state of the art of power battery packs, the present application provides a power battery pack and an electric vehicle having the same, which have advantages such as high space utilization rate, high energy density, and long driving range.

[0019] A power battery pack 10 according to an embodiment of the first aspect of the present application includes a pack body 200 and a plurality of cells 100. The plurality of cells 100 are directly disposed and arranged within the pack body 200. The cells 100 extend from a first side of the pack body 200 to a second side of the pack body 200, with the first side and the second side facing each other. The first side and the second side are located at edges of the pack body 200.

[0020] For example, the longitudinal direction of the single battery 100 extends along the width direction of the pack body 200, the first side is one side along the width direction of the pack body 200, and the second side is the other side along the width direction of the pack body 200.

[0021] The term "directly" in the above direct arrangement means that the cells 100 in the housing chamber are not pre-assembled into a battery module before being installed in the housing chamber, but are installed by arranging the cells 100 in the housing chamber during the assembly process. For example, a battery array formed of cells 100 does not have structures such as end plates and side plates (for example, the structure shown in FIG. 1, in which the cells are first assembled into a battery module and then placed in the pack body).

[0022] The power battery pack 10 of the present application directly arranges and arranges multiple cells 100 within multiple accommodation chambers within the pack body 200, thereby eliminating the various mounting structures required for mounting battery modules in conventional battery packs, improving the utilization of the internal space of the pack body, and increasing the sum of the volumes of the cells 100 within the pack body 200. In other words, the ratio of the volume of the cells 100 to the volume of the pack body 200 is increased, allowing more cells 100 to be assembled within a given volumetric space, thereby improving the energy density of the power battery pack 10. At the same time, the assembly process is simple, reducing labor and material costs. Furthermore, the reduced number of assembly steps reduces the probability of defective products and the possibility of loosening and insufficient mounting during the assembly of the power battery pack 10, improving the quality, stability, and reliability of the power battery pack 10.

[0023] A power battery pack 10 according to an embodiment of the present invention will be described below with reference to the drawings.

[0024] As shown in FIGS. 2 to 16, a power battery pack 10 according to an embodiment of the present invention includes a pack body 200 and a plurality of unit cells 100. As shown in FIGS.

[0025] In some embodiments, for example, a typical pack body 200 structure in the industry includes a tray 210 and an upper cover 220, and the tray 210 and the upper cover 220 together define a storage space for a plurality of cells 100, and the plurality of cells 100 are mounted on the tray 210 and covered by the upper cover 220. In this embodiment, the tray 210 may be a box body with an open top, and the upper cover 220 is flat and seals the upper opening of the tray 210. In a typical solution in the industry, the tray 210 is a box body with an open top, and the upper cover 220 is an opposite box body with an open bottom, and the upper opening of the tray 210 corresponds to the lower opening of the upper cover 220, and the two are aligned during assembly to realize packaging for the internal storage space.

[0026] Of course, in some other special embodiments, for example, if the entire cells have high waterproof performance or if the pack body is directly formed on the electric vehicle, there is no need to provide an upper cover, and only one tray is required to support a battery array composed of multiple cells. Furthermore, in some embodiments, the pack body does not need to have side beams or frames located around its periphery; the pack body is closer to the flat plate and has no frame, and the cells are directly mounted on the flat plate, or cross beams are provided on the flat plate and the cells are then fixed by the cross beams. More specifically, the pack body may be considered as a bracket that supports the cells and attaches the battery array formed of the cells to the electric vehicle, and need not be limited to a complete pack body.

[0027] The plurality of cells 100 are provided in a pack body 200, which can be understood as a case for accommodating the plurality of cells 100 and can include, for example, a tray 210 and an upper cover 220, which together define an accommodation space for the plurality of cells 100, the plurality of cells 100 being provided in the tray 210 and covered by the upper cover 220, and the accommodation space being the entire undivided space. In other words, as shown in Figures 14 and 16, no widthwise cross beams 500 extending along the width direction B of the power battery pack 10 are provided in the pack body 200, and no lengthwise cross beams 600 extending along the lengthwise direction A of the power battery pack 10 are provided, and the lengthwise ends of the cells 100 are supported by the pack body 200.

[0028] For example, a first side wall is provided on a first side of the pack body 200, a second side wall is provided on a second side, and one end of the battery 100 is supported by the first side wall and the other end is supported by the second side wall.

[0029] In some other embodiments of the present application, the pack body 200 may have a bottom plate, and the cells 100 are supported on the bottom plate.

[0030] In some specific embodiments of the present application, as shown in FIGS. 2 to 16, a power battery pack 10 according to the embodiments of the present application includes a pack body 200 and a plurality of cells 100. As shown in FIG.

[0031] The plurality of cells 100 are provided in a pack body 200, which can be understood as a case for accommodating the plurality of cells 100 and can include, for example, a tray 210 and an upper cover 220, which together define an accommodation space for the plurality of cells 100, and the plurality of cells 100 are provided in the tray 210 and covered by the upper cover 220, i.e., provided within the accommodation space. The sum V1 of the volumes of the plurality of cells 100 and the volume V0 of the accommodation space satisfy the relationship 81%≦V1 / V0≦97%.

[0032] As will be understood by those skilled in the art, V1 is the product of the volume of each cell 100 and the number of cells 100, and V0 refers to the volume that can actually accommodate the cells 100, the widthwise cross beams 500, and the lengthwise cross beams 600, when the case volume including the tray bottom plate, the four frames surrounding the tray bottom plate, and the top cover, and the volume occupied by the internal battery management system and other power distribution modules, are subtracted from the total volume of the pack body 200.

[0033] In the power battery pack 10 according to the embodiment of the present application, an accommodation space is formed within the pack body 200, and the plurality of cells 100 are directly arranged and aligned within the accommodation space. By limiting the ratio of the sum of the volumes of the cells 100 to the volume of the accommodation space, i.e., 81%≦V1 / V0≦97%, for example, 81%≦V1 / V0≦92%, the space utilization rate of the power battery pack 10 can be improved and more cells 100 can be arranged within the power battery pack 10, i.e., more energy supply structures can be arranged within a unit space. As a result, the energy density can be improved and the driving range can be improved without increasing the occupied space.

[0034] In some specific examples of the present application, as shown in FIGS. 2 to 16, a power battery pack 10 according to an embodiment of the present application includes a pack body 200 and a plurality of unit cells 100. As shown in FIG.

[0035] In the power battery pack 10 according to the embodiment of the present application, the ratio of the length of the cells 100 to the size of the vehicle body in the direction of extension of the length of the cells, i.e., 46%≦L0 / X≦75%, is limited, thereby making full use of the space in the vehicle body and allowing more cells 100 to be placed within a unit space of the vehicle body, i.e., allowing more energy supply structures to be placed within a unit space, thereby improving the energy density and increasing the driving range without increasing the occupied space.

[0036] In some specific embodiments of the present application, as shown in FIGS. 2 to 16, a power battery pack 10 according to the embodiments of the present application includes a pack body 200 and a plurality of cells 100. As shown in FIG.

[0037] The cells 100 are arranged in a pack body 200, which can be understood as a case for accommodating the cells 100, and may include, for example, a tray 210 and an upper cover 220. The tray 210 and the upper cover 220 together define an accommodating space for the cells 100. The cells 100 are arranged in the tray 210 and covered by the upper cover 220, i.e., within the accommodating space, which has a bottom surface, which is a part of the bottom wall defining the accommodating space. In a specific embodiment of the present application, an accommodating space is formed within the pack body 200, and the cells are directly arranged and aligned within the accommodating space, and the sum S1 of the areas of the orthogonal projections of the cells 100 on the bottom surface and the area S0 of the bottom surface satisfy the relationship 72%≦S1 / S0≦88%.

[0038] As will be understood by those skilled in the art, S1 is the product of the area of ​​the orthogonal projection of each battery cell 100 onto the bottom surface and the number of batteries 100, and S0 is the area of ​​the bottom surface, where the area of ​​the bottom surface refers to the entire flat area of ​​the bottom surface and does not include the surface area of ​​any uneven structures; in other words, it can be understood as the area of ​​the orthogonal projection of the bottom surface onto a horizontal plane.

[0039] The power battery pack 10 according to the embodiment of the present application improves the space utilization rate of the power battery pack 10 by limiting the ratio of the sum of the areas of the orthogonal projections of the cells 100 onto the bottom surface to the area of ​​the bottom surface, i.e., 72%≦S1 / S0≦88%, and allows more cells 100 to be placed within the power battery pack 10, i.e., more energy supply structures to be placed within a unit space, thereby improving the energy density and improving the driving range without increasing the occupied space.

[0040] In some embodiments of the present application, the sum of the volumes of the plurality of cells 100 and the power battery pack V1 The volume V2 of the block 10 satisfies V1 / V2≧55%.

[0041] As will be understood by those skilled in the art, V1 is the product of the volume of each cell 100 and the number of cells 100, and V2 is the total volume of the three-dimensional shape defined by the outer casing of the power battery pack 10, i.e., the volume including the internal space of the power battery pack 10, i.e., the volume of the three-dimensional area spatially enclosed by the outer casing of the power battery pack 10. V1 / V2 can be defined as the space utilization rate.

[0042] The power battery pack 10 according to the embodiment of the present application improves the space utilization rate of the power battery pack 10 by limiting the ratio of the sum of the volumes of the cells 100 to the volume of the power battery pack 10, i.e., V1 / V2 ≧ 55%, and allows more cells 100 to be arranged in the power battery pack 10, i.e., more energy supply structures to be arranged in a unit space, thereby improving the energy density and improving the driving range without increasing the occupied space.

[0043] In some embodiments of the present application, the ratio of the sum of the volumes of the cells 100 to the volume of the power battery pack 10 satisfies V1 / V2≧60%, and in some embodiments of the present application, the ratio of the sum of the volumes of the cells 100 to the volume of the power battery pack 10 satisfies ≧65%.

[0044] As found through testing, the power battery pack 10 according to the embodiment of the present application and the battery pack disclosed in Chinese Patent Document CN107925028A were tested. Both were tested using LPF (lithium iron phosphate) batteries with a power capacity of 73 kWh. Since both require a PDU (power distribution unit) during use, a comparison was made using a PDU. The power battery pack 10 according to the embodiment of the present application had a space utilization rate of 62.5% and an energy density of 281 wh / L, while the battery pack disclosed in Chinese Patent Document CN107925028A had a space utilization rate of 51% and an energy density of 257 wh / L. Therefore, the battery pack disclosed in Chinese Patent Document CN107925028A had lower space utilization rate and energy density than the power battery pack 10 according to the embodiment of the present application, and its driving range was also significantly lower than that of the power battery pack 10 according to the embodiment of the present application.

[0045] As can be understood by those skilled in the art, due to the influence of several factors, for example, peripheral components including the anti-collision space at the bottom of the tray, the liquid cooling system, the heat insulation material, the insulation protection material, the thermal safety auxiliary components, the flame discharge and exhaust passage, the high-voltage power distribution module, etc. occupy the internal space of the pack body 200. Therefore, the maximum value of V1 / V2 is generally 80%, that is, V1 / V2≤80%.

[0046] Hereinafter, referring to the drawings, the power battery pack 10 according to specific embodiments of the present application will be described. The longitudinal direction of the power battery pack 10 is indicated by arrow A, the width direction is indicated by arrow B, and the height direction is indicated by arrow C.

[0047] In some specific embodiments of the present application, as shown in FIGS. 2 to 4, the single battery 100 is arranged such that its longitudinal direction is along the width direction B of the power battery pack 10, and a plurality of single batteries 100 are arranged along the longitudinal direction A of the power battery pack 10. In this way, it helps to set the space utilization rate of the power battery pack 10 to 55%, 60% or more.

[0048] In some specific examples of the present application, as shown in FIGS. 3 and 4, in the width direction B of the power battery pack 10, the distance between the single battery 100 and the side wall of the pack body 200 is smaller than the length of the single battery 100. Specifically, in the width direction B of the power battery pack 10, the closest distance between one end of the single battery 100 and the side beam of the pack body 200 adjacent to it (the above-mentioned one end of the single battery 100) is L1, and the closest distance between the other end of the single battery 100 and the side beam of the pack body 200 adjacent to it (the above-mentioned other end of the single battery 100) is L2, and the length L0 of the single battery 100 satisfies L1 + L2 < L0. In this way, in the width direction B of the power battery pack 10, another additional single battery 100 cannot be accommodated.

[0049] In other words, the pack body 200 accommodates only one single battery 100 in the width direction B of the power battery pack 10. That is, in the width direction B of the power battery pack 10, the single batteries 100 cannot be arranged in a number of two or more.

[0050] As can be seen, both sides of the pack body 200 in the width direction B of the power battery pack 10 are side beams, and both ends of the pack body 200 in the length direction A of the power battery pack 10 are end beams.

[0051] 3 and 4 , in some embodiments of the present application, the length of the cells 100 extends across the entire width direction B of the power battery pack 10, i.e., the cells 100 extend from one side to the other of the pack body 200 along the width direction B of the power battery pack 10, and the length of the cells 100 is filled in the width direction B of the power battery pack 10. The pack body 200 cannot accommodate two or more cells 100 in the width direction B of the power battery pack 10, and both ends of the cells 100 in the longitudinal direction fit into the opposing side walls of the pack body 200 in the width direction B, for example, and can be fixed to the pack body 200. This eliminates the need for width-direction cross beams and length-direction cross beams inside the pack body 200, and the connected cells 100 directly play the role of reinforcing ribs, greatly simplifying the structure of the pack body 200 and reducing the space occupied by the reinforcing ribs and the space occupied by the mounting structure for the cells 100, thereby improving space utilization and range.

[0052] In some specific examples of the present application, the pack body 200 includes side beams located on both sides of the width direction B of the power battery pack 10, and both longitudinal ends of the unit cells 100 are supported by the side beams, and the pack body 200 includes end beams located on both ends of the length direction A of the power battery pack 10, and the end beams provide inward pressing force to the unit cells 100 adjacent to them.

[0053] 3 and 4, the pack body 200 has a first side beam 201, a second side beam 202, a first end beam 203, and a second end beam 204, which are connected in sequence, with the first side beam 201 and the second side beam 202 facing each other in the width direction B of the power battery pack 10, and the first end beam 203 and the second end beam 204 facing each other in the longitudinal direction A of the power battery pack 10. The first side beam 201 and the second side beam 202 provide support to both ends of the cell 100 in the longitudinal direction, i.e., one end of the cell 100 is supported by the first side beam 201, and the other end is supported by the second side beam 202. The first end beam 203 and the second end beam 204 provide pressing forces on both sides of the thickness direction of the cells 100, i.e., the first end beam 203 applies a force toward the second end beam 204 to the cells 100 arranged adjacent to the first end beam 203, and the second end beam 204 applies a force toward the first end beam 203 to the cells 100 arranged adjacent to the second end beam 204. In this way, the multiple cells 100 can be closely arranged between the first end beam 203 and the second end beam 204 along the longitudinal direction A of the power battery pack 10 and can be attached to each other. In addition, the first end beam 203 and the second end beam 204 can positionally regulate the multiple cells 100 in the longitudinal direction A of the power battery pack 10, and in particular, when the cells 100 expand slightly, they act to cushion and provide inward pressure to the cells 100, preventing the cells 100 from expanding and deforming too much.

[0054] In some specific examples of the present application, as shown in FIG. 7, the single battery 100 is arranged such that its longitudinal direction is along the width direction B of the power battery pack 10. A plurality of single batteries 100 are arranged along the longitudinal direction A of the power battery pack 10 to form a battery array, and the pack body 200 includes at least two layers of battery arrays along the height direction C of the power battery pack 10. Thereby, by optimizing the number of single batteries 100, the space utilization rate is improved to improve the energy density, and it is easy to realize the integration of the BIC and the low-voltage sampler.

[0055] In some specific embodiments of the present application, as shown in FIGS. 15 and 16, the single battery 100 is arranged such that its longitudinal direction is along the longitudinal direction A of the power battery pack 10. A plurality of single batteries 100 are arranged along the width direction B of the power battery pack 10. Thus, it helps to set the space utilization rate of the power battery pack 10 to 50%, 60% or more.

[0056] In some specific examples of the present application, as shown in FIGS. 15 and 16, in the longitudinal direction A of the power battery pack 10, the distance between the single battery 100 and the end wall of the pack body 200 is smaller than the length of the single battery 100. Specifically, in the longitudinal direction A of the power battery pack 10, the closest distance between one end of the single battery 100 and the end beam of the pack body 200 adjacent to it (the above-mentioned one end of the single battery 100) is L3, and the closest distance between the other end of the single battery 100 and the end beam of the pack body 200 adjacent to it (the above-mentioned other end of the single battery 100) is L4. The length L0 of the single battery 100 satisfies L3 + L4 < L0. Thus, in the longitudinal direction A of the power battery pack 10, it is not possible to accommodate another additional single battery 100.

[0057] In other words, the pack body 200 accommodates only one single battery 100 in the longitudinal direction A of the power battery pack 10. That is, in the longitudinal direction A of the power battery pack 10, the single batteries 100 cannot be arranged in a number of two or more.

[0058] As can be seen, both sides of the pack body 200 in the width direction B of the power battery pack 10 are side beams, and both ends of the pack body 200 in the length direction A of the power battery pack 10 are end beams.

[0059] In some specific examples of the present application, as shown in Figures 15 and 16, the length of the cell 100 extends over the entire longitudinal direction A of the power battery pack 10, i.e., the cell 100 extends from one end to the other end of the pack body 200 along the longitudinal direction A of the power battery pack 10, the length of the cell 100 is filled in the longitudinal direction A of the power battery pack 10, the pack body 200 cannot accommodate two or more cells 100 in the longitudinal direction A of the power battery pack 10, and both ends of the cell 100 in the longitudinal direction fit into opposite end walls of the pack body 200 in the longitudinal direction A, and can be fixed to the pack body 200, for example. As a result, there is no need for widthwise and lengthwise cross beams inside the pack body 200, and the connected cells 100 directly serve as reinforcing ribs, greatly simplifying the structure of the pack body 200 and reducing the space occupied by the reinforcing ribs and the space occupied by the mounting structure of the cells 100, thereby improving space utilization and range.

[0060] In some specific examples of the present application, the pack body 200 includes end beams located at both ends of the power battery pack 10 in the longitudinal direction A, and both ends of the cell 100 in the longitudinal direction are supported by the end beams, and the pack body 200 includes side beams located on both sides of the power battery pack 10 in the width direction B, and the side beams provide an inward pressing force to the cell 100 adjacent to them.

[0061] 16 , the pack body 200 has a first side beam 201, a second side beam 202, a first end beam 203, and a second end beam 204, which are connected in sequence, with the first side beam 201 and the second side beam 202 facing each other in the width direction B of the power battery pack 10, and the first end beam 203 and the second end beam 204 facing each other in the longitudinal direction A of the power battery pack 10. The first end beam 203 and the second end beam 204 provide support to both ends of the cell 100 in the longitudinal direction, i.e., one end of the cell 100 is supported by the first end beam 203, and the other end is supported by the second end beam 204. The first side beam 201 and the second side beam 202 provide pressing forces on both sides of the thickness direction of the single battery 100, i.e., the first side beam 201 applies a force toward the second side beam 202 to the single battery 100 arranged adjacent to the first side beam 201, and the second side beam 202 applies a force toward the first side beam 201 to the single battery 100 arranged adjacent to the second side beam 202. In this way, multiple single batteries 100 can be closely arranged between the first side beam 201 and the second side beam 202 along the width direction B of the power battery pack 10 and can be attached to each other. In addition, the first side beam 201 and the second side beam 202 can position the multiple cells 100 in the width direction B of the power battery pack 10, and 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 and deforming too much.

[0062] 15, in some specific examples of the present application, the cells 100 are arranged so that their longitudinal direction is along the longitudinal direction A of the power battery pack 10, and a plurality of cells 100 are arranged along the width direction B of the power battery pack 10 to form a battery array, and at least two layers of battery arrays are included along the height direction C of the power battery pack 10 within the pack body 200. In this way, by optimizing the number of cells 100, it is possible to improve the space utilization rate, increase the energy density, and facilitate the integration of BICs and low-voltage samplers.

[0063] In some specific embodiments of the present application, a plurality of cells 100 can be assembled into a plurality of battery arrays 400. The plurality of battery arrays 400 can be arranged along the longitudinal direction A of the power battery pack 10 (as shown in FIG. 6 ), along the width direction B of the power battery pack 10 (as shown in FIG. 15 ), or arranged to form a multi-layer structure along the height direction C of the power battery pack 10 (as shown in FIG. 7 ). In other words, regardless of whether the cells 100 extend along the width direction B of the power battery pack 10 or along the longitudinal direction A, the plurality of cells 100 can be arranged in multiple layers along the height direction C of the power battery pack 10. Naturally, a plurality of battery arrays 400 can be arranged simultaneously along the longitudinal direction A and the height direction C of the power battery pack 10, or along the width direction A and the height direction C of the power battery pack 10. This allows the number of battery arrays 400 to be optimized, thereby improving space utilization, increasing energy density, and facilitating the integration of BICs and low-voltage samplers. The battery array 400 in the embodiment of the present application does not include structures such as end plates and side plates.

[0064] In the prior art, due to the small size and short length of the unit cells, the opposing ends of the unit cells cannot fit into the two opposing side walls of the pack body 200'', so it is necessary to provide longitudinal cross beams 600' and / or width cross beams 500' (shown in FIG. 1) in the pack body 200'', thus facilitating the assembly of the unit cells. After the unit cells are installed in the pack body 200'' in the form of battery modules 400', a plurality of unit cells exist along the width direction of the power battery pack 10', i.e., the unit cells do not extend between the two opposing side walls, but extend between the two opposing longitudinal cross beams 600' or width cross beams 500', and the battery modules are fixed to the adjacent longitudinal cross beams 600' and / or width cross beams 500' by fasteners.

[0065] In the prior art, longitudinal cross beams 600' and / or widthwise cross beams 500' are provided within the pack body 200'', and the longitudinal cross beams 600' and / or widthwise cross beams 500' occupy a large amount of mounting space within the pack body 200'' for accommodating the cells, resulting in a low space utilization rate of the pack body 200''. Generally, the ratio of the sum of the volumes of the cells to the volume of the pack body 200'' is about 40%, and is even lower. In other words, in the prior art, the space within the pack body 200'' for mounting the cells is only about 40%, which limits the number of cells that can be accommodated in the pack body 200'', restricts the overall capacity and voltage of the power battery pack 10', and reduces the cruising range of the power battery pack 10'.

[0066] The power battery pack 10 according to the embodiment of the present application reduces the use of longitudinal and / or widthwise cross beams in the pack body 200, and even eliminates the need for longitudinal and / or widthwise cross beams in the pack body 200, thereby reducing the space occupied by the longitudinal and / or widthwise cross beams in the pack body 200 and improving the space utilization rate of the pack body 200, while reducing the use of end plates and side plates in the battery array 400 and reducing the space occupied by the end plates and side plates in the pack body 200, thereby improving the space utilization rate of the pack body 200. By arranging as many cells 100 as possible in the pack body 200, the capacity, voltage, and driving range of the entire power battery pack can be improved.

[0067] Furthermore, since there is no need to further arrange longitudinal cross beams and / or width cross beams within the pack body 200, the manufacturing process for the pack body 200 is simplified, the complexity of assembling the cells 100 is reduced, and production costs are reduced, while the weight of the pack body 200 and the entire power battery pack 10 is reduced, resulting in a lightweight power battery pack 10. In particular, when the power battery pack 10 is installed in an electric vehicle, it can improve the driving range of the electric vehicle and also reduce the weight of the electric vehicle.

[0068] Furthermore, the cells 100 themselves are used to reinforce the structural strength of the pack body 200. In other words, there is no need to provide an additional reinforcing structure within the pack body 200 to reinforce its structural strength. Instead of a reinforcing structure, the cells 100 themselves ensure the structural strength of the pack body 200, ensuring that the pack body 200 is less likely to deform under the action of external forces. Compared to the battery assembly disclosed in Chinese Patent Document CN107925028A, the pack body 200 not only houses and protects the cells 100, but also supports the cells 100 and improves the load-bearing capacity of the entire power battery pack 10, and the length of the cells 100 reinforces the strength of the power battery pack 10. Furthermore, the increased surface area of ​​each cell 100 increases the heat dissipation area of ​​the cell 100, improving the heat dissipation rate of the cell 100 and further improving the safety of the entire power battery pack 10, making the power battery pack 10 safer and more reliable.

[0069] 9 and 10 , the pack body 200 differs from the case of the battery pack disclosed in Chinese Patent Document CN107925028A, particularly in terms of size and load support. The pack body 200 may include a vehicle tray 210 that engages with and connects to the vehicle body / car body to form a structure for accommodating and supporting the cells 100, the vehicle tray 210 being an independently manufactured tray for accommodating and mounting the cells 100. After the cells 100 are mounted in the vehicle tray 210, the vehicle tray 210 can be attached to the car body with fasteners, and can be hung from the chassis of an electric vehicle, for example, to perform the functions of accommodating and supporting the load.

[0070] When the power battery pack 10 is used as a power battery pack for use in a vehicle to supply electrical energy, the longitudinal direction of the cells 100 can be arranged along the width direction of the vehicle body, i.e., the left-right direction of the vehicle. In this case, the length L of the battery body 110 of the cells 100 may be 600 mm to 2500 mm, or may be selected to be 600 mm to 1500 mm, so that the length of the cells 100 matches the width of the vehicle.

[0071] In some embodiments of the present application, as shown in Figure 8, the pack body 200 may be formed directly on the electric vehicle, i.e., the pack body 200 is formed at any suitable location on the electric vehicle and is a device for mounting the cells 100. For example, the pack body 200 may be formed on the chassis of the electric vehicle.

[0072] In some specific embodiments of the present application, when the power battery pack 10 is installed in an electric vehicle, unlike the battery pack disclosed in Chinese Patent Document CN107925028A, the power battery pack 10 includes at least one of components required for a vehicle battery, such as a battery management system (BMS), a battery connector, a battery sampler, and a battery thermal management system, and the power battery pack 10 is arranged so that the width direction B is along the width direction of the vehicle body, i.e., the left-right direction of the vehicle, and the length direction is along the length direction of the vehicle body, i.e., the front-rear direction of the vehicle. Of course, the present application is not limited thereto, and the power battery pack 10 may be arranged so that the width direction B is along the length direction of the vehicle body and the length direction A is along the width direction of the vehicle body.

[0073] As will be understood by those skilled in the art, the orientation of the cells 100 within the power battery pack 10 and the orientation of the power battery pack 10 in the electric vehicle can be combined in different ways. For example, the cells 100 can be arranged such that their longitudinal direction is aligned with the width direction B of the power battery pack 10, or such that their longitudinal direction is aligned with the longitudinal direction A of the power battery pack 10. The power battery pack 10 can be arranged such that its width direction B is aligned with the width direction of the vehicle body, or such that its width direction B is aligned with the longitudinal direction of the vehicle body. Furthermore, for example, regardless of whether the width direction B of the power battery pack 10 is aligned with the width direction of the vehicle body or the longitudinal direction of the vehicle body, the cells 100 can be arranged such that their longitudinal direction is aligned with the width direction of the vehicle body. The relative orientations of the cells 100, the power battery pack 10, and the vehicle body can be set according to actual applications to meet different requirements.

[0074] Hereinafter, a cell 100 according to an embodiment of the present invention will be described with reference to the drawings.

[0075] In the following specific examples, the units of length L, width H, and thickness D are all millimeters (mm), and the unit of surface area S is square millimeters (mm 2 ) and the unit of volume V is cubic millimeters (mm 3 ) and the unit of energy E is the watt-hour (Wh).

[0076] 5, a battery 100 according to an embodiment of the present invention includes a battery body 110, which can be understood as the main body excluding small protruding structures such as tabs. The battery body 110 has a length L, a width H, and a thickness D.

[0077] The length L of the battery body 110 is greater than the width H of the battery body 110, and the width H of the battery body 110 is greater than the thickness D of the battery body 110. The length L of the battery body 110 and the width H of the battery body 110 satisfy L / H=4 to 20 and may be selected to be 9 to 13.

[0078] In the development of electric vehicles, the voltage plateau requirements for a cell are predetermined, so the volume of the cell is constant. That is, when a certain voltage platform is reached, the volume remains constant because the amount of material contained in the cell remains constant even when using the same chemical materials. In the cell 100 according to the embodiment of the present application, the ratio of the length L to the width H of the cell body 110 can be designed to rationally flatten the cell body 110 with a constant volume, which is useful for the overall arrangement within the power battery pack (e.g., realizing the arrangement of the power battery pack 10 according to the above embodiment of the present application), thereby improving the space utilization rate of the power battery pack, improving the energy density of the power battery pack, and improving the cruising capacity of the power battery pack. Meanwhile, the cell 100 ensures a sufficiently large heat dissipation area, allowing the internal heat to be transferred to the outside in a timely manner and preventing heat accumulation inside, thereby meeting the high energy density and supporting improved cruising capacity.

[0079] In order to optimize the arrangement of the cells 100 in the power battery pack and improve the heat dissipation capacity of the cells 100, the length L and thickness D of the battery body 110 satisfy L / D=23-200.

[0080] In some specific embodiments of the present application, as shown in Figure 5, the battery body 110 is configured in a rectangular parallelepiped shape with a smooth outer surface to ensure a certain structural strength. For example, the battery electrode assembly is placed in a rectangular battery case, the opening of the battery case is sealed with a cover plate, and an electrolyte is injected. Compared to batteries using aluminum-plastic composite membranes, the unit cell 100 of the embodiments of the present application has high thermal conductivity and, when combined with conventional battery thermal management structures, can effectively avoid heat dissipation problems caused by large-sized structures. Compared to cylindrical batteries, it has higher space utilization and a simpler manufacturing and assembly process.

[0081] When the cell 100 according to the embodiment of the present application is disposed in the pack body 200 of the power battery pack 10, the length and thickness of the cell body 110 may extend horizontally, and the width may extend vertically. That is, the cell 100 may be disposed vertically, and the horizontal and vertical directions are based on the directions when the power battery pack 10 is used (e.g., when applied to an electric vehicle).

[0082] In some embodiments of the present application, the arrangement of the cells 100 within the power battery pack 10 is optimized to improve energy density and range, and other parameters of the cells 100 are designed to make the arrangement of the battery body 110 more compact and more concentrated in the limited space of the pack body 200.

[0083] For example, the length L of the battery body 110 and the volume V of the battery body 110 are L / V=0.0005 to 0.002 mm -2 The width H of the battery body 110 and the volume V of the battery body 110 are H / V=0.0001 to 0.00015 mm -2The thickness D of the battery body 110 and the volume V of the battery body 110 are D / V=0.0000065 to 0.00002 mm -2 Thus, for a battery body 110 with a fixed volume, by designing the ratio of each of the length L, width H, and thickness D to the volume V, the spatial distribution of a unit amount of energy can be optimized, which is helpful for the arrangement within the pack body 200.

[0084] The length L of the battery body 110 and the surface area S of the battery body 110 are L / S=0.002 to 0.005 mm -1 The length L of the battery body 110 and the energy E of the battery body 110 are L / E=0.8 to 2.45 mm·Wh. -1 and L / E = 1.65 to 2.45 mm Wh -1 This helps the cells 100 to straddle both opposing sides of the pack body 200 in the longitudinal direction, thus improving the driving range of the power battery pack 10 and achieving both structural strength and heat dissipation effect for the cells 100.

[0085] In some other examples of the present application, the surface area S of the battery body 110 and the volume V of the battery body 110 are S / V=0.1 to 0.35 mm -1 This not only ensures a sufficient heat dissipation area and a heat dissipation effect, but also reduces the volume ratio of the cells 100, which helps to make the arrangement of the multiple cells 100 in the power battery pack 10 more compact.

[0086] The surface area S of the battery body 110 and the energy E of the battery body 110 are S / E≦1000 mm 2 ·Wh -1 As a result, the surface heat dissipation of the cell 100 is sufficient, and especially when a ternary or high-nickel ternary positive electrode material is used, it is possible to ensure that the heat inside the battery is transferred in a timely manner, which contributes to the safety of the battery. In addition, the cell 100 in the embodiment of the present application is a prismatic cell with a smooth outer surface, which provides a certain degree of structural strength, good metal thermal conductivity, and is less difficult to process and later assemble than a cell that has an increased surface area due to corrugation.

[0087] In some specific embodiments of the present application, as shown in FIG. 5, the cell 100 further includes a first terminal 101 and a second terminal 102.

[0088] The first terminal 101 is provided at one end of the battery body 110 in the longitudinal direction, and the second terminal 102 is provided at the other end of the battery body 110 in the longitudinal direction. In other words, the longitudinal direction of the battery 100 may be the direction of current flow inside the battery 100, that is, the direction of current flow inside the battery 100 is as shown by arrow B. Since the current flow direction is the same as the longitudinal direction of the battery 100, the effective heat dissipation area of ​​the battery 100 is larger and the heat dissipation efficiency is higher. Here, the first terminal 101 is connected to the positive electrode tab of the battery 100 and the second terminal 102 is connected to the negative electrode tab of the battery 100, or alternatively, the first terminal 101 is connected to the negative electrode tab of the battery 100 and the second terminal 102 is connected to the positive electrode tab of the battery 100.

[0089] In some embodiments of the present application, as shown in FIG. 5, the cell 100 further includes an explosion-proof valve 103 .

[0090] The explosion-proof valve 103 is provided at least at one end in the longitudinal direction of the battery body 110. If the battery 100 malfunctions and expands, the interior will have sufficient air pressure to break through the inverted sheet in the explosion-proof valve 103, thereby short-circuiting the battery 100, ensuring the safety of the battery 100 and preventing it from exploding.

[0091] As will be understood by those skilled in the art, the provision of the explosion-proof valve 103 can be applied not only to aluminum case batteries but also to pouch batteries, and the explosion-proof valve 103 may be provided at a position other than the end of the battery body 100.

[0092] In some specific embodiments of the present application, the explosion-proof valves 103 are provided at both ends of the battery body 110 in the longitudinal direction, and the explosion-proof valves 103 at both ends of the battery body 110 are vented through different vent passages 222 .

[0093] For example, as shown in FIGS. 2, 5, and 11, an explosion-proof valve 103 is provided at a first end of each cell 100 facing the first side beam 201, an exhaust passage 222 is provided inside the first side beam 201, and an air intake 221 is provided at each position of the first side beam 201 corresponding to the explosion-proof valve 103 of each cell 100, and the air intake 221 communicates with the exhaust passage 222, and the pack body 200 is provided with an exhaust port 221 communicating with the exhaust passage 222. A hole is provided, and / or an explosion-proof valve 103 is provided at the 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, an air intake port 221 is provided at each position on the second side beam 202 corresponding to the explosion-proof valve 103 of each single battery 100, the air intake port 221 is connected to the exhaust passage 222, and an exhaust hole connected to the exhaust passage 222 is provided in the pack body 200.

[0094] In the prior art, when a battery is in use, if the internal air pressure rises to a certain level, the explosion-proof valve opens, and the flames, smoke, or gases inside the battery are released through the explosion-proof valve and collected inside the power battery pack. If they cannot be released in a timely manner, they will cause secondary damage to the battery. In the embodiment of the present application, the first side beam 201 and / or the second side beam 202 are provided with air intakes 221 corresponding to the explosion-proof valves 103 of the cells 100, and exhaust passages 222 are provided inside the first side beam 201 and / or the second side beam 202. Therefore, when the air pressure inside the cells 100 rises, the explosion-proof valves 103 open, and flames, smoke, gas, etc. inside the cells 100 pass directly through the air intakes 221 into the exhaust passages 222 in the first side beam 201 and / or the second side beam 202, and are then exhausted from the first side beam 201 and / or the second side beam 202 through the exhaust holes, for example, into the atmosphere. In this way, the flames, smoke, or gases do not collect inside the pack body 200, and secondary damage to the cells 100 is avoided.

[0095] In addition, one end of each of the multiple cells 100 is vented through an exhaust passage 222 in the first side beam 201, and the other end is vented through an exhaust passage 222 in the second side beam 202.In this way, both ends of the cell 100 are vented through different passages, increasing the exhaust distance and forming alternating exhaust, thereby reducing the temperature.

[0096] Hereinafter, an electric vehicle 1 according to an embodiment of the present application will be described with reference to the drawings. The electric vehicle may include electric vehicles such as commercial vehicles, special vehicles, electric bicycles, electric motorcycles, and electric scooters that require a power battery pack to provide electric energy for driving.

[0097] As shown in Figures 9 and 10, an electric vehicle 1 according to an embodiment of the present application includes a power battery pack 10 according to the above embodiment of the present application, and a pack body 200 may be integrally molded with the electric vehicle or may be a separately manufactured vehicle tray that houses and mounts the single cells 100.

[0098] The electric vehicle 1 according to the embodiment of the present application can improve its driving range without increasing the space occupied by the battery by using the power battery pack 10 according to the above embodiment of the present application.

[0099] 9 and 10, in some specific embodiments of the present application, the power battery pack 10 is installed at the bottom of the electric vehicle 1, and the pack body 200 is fixedly connected to the chassis of the electric vehicle 1. Because the installation space on the chassis of the electric vehicle 1 is large, installing the power battery pack 10 on the chassis of the electric vehicle 1 can increase the number of cells 100 as much as possible, thereby improving the driving range of the electric vehicle 1.

[0100] 9 and 10 , the electric vehicle 1 includes one power battery pack 10 mounted on the bottom of the electric vehicle 1, and the pack body 200 is fixedly connected to the chassis of the electric vehicle 1. The power battery pack 10 is arranged so that its width is along the width direction of the body of the electric vehicle 1, i.e., the left-right direction of the electric vehicle 1, and its length is along the length direction of the body of the electric vehicle 1, i.e., the front-rear direction of the electric vehicle 1. In other embodiments, the electric vehicle 1 may include multiple power battery packs 10 mounted on the bottom of the electric vehicle 1, and the shapes and dimensions of the multiple battery packs 10 may be the same or different, and each power battery pack 10 can be adjusted according to the shape and dimensions of the chassis of the electric vehicle 1. The multiple power battery packs 10 are arranged along the length direction of the body, i.e., the front-rear direction.

[0101] In some specific examples of the present application, the ratio of the width F of the pack body 200 to the width W of the vehicle body satisfies 50%≦F / W≦80%, and in this embodiment, this can be achieved by providing only one pack body 200 along the width direction of the vehicle body. When there are multiple pack bodies 200, the multiple pack bodies 200 are arranged along the longitudinal direction of the vehicle body. Generally, for most vehicles, the width W of the vehicle body is 500 mm to 2000 mm, for example, 500 mm, 1600 mm, 1800 mm, or 2000 mm, and the length of the vehicle body is 500 mm to 5000 mm. For passenger cars, the width of the passenger car is generally 500 mm to 1800 mm, and the length of the vehicle body is 500 mm to 4000 mm.

[0102] In some other embodiments of the present application, the width F of the pack body 200 is 500 mm to 1500 mm, which is much larger than the case of the battery pack disclosed in Chinese Patent Document CN107925028A, and is useful for accommodating the battery array 400 of the battery pack such as CN107925028A, ensuring driving range, and fitting to the dimensions of the vehicle body.

[0103] In some specific examples of the present application, the cell 100 includes a battery body 110, and the ratio of the length L of the battery body 110 to the width W of the vehicle body satisfies 46%≦L / W≦76%. In this example, this can be achieved 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 achieved by providing multiple battery arrays 400 or multiple cells 100 in the longitudinal direction. In some examples, the length L of the battery body 110 is 400 mm to 1500 mm.

[0104] Other configurations and operations of the cell 100, power battery pack 10, and electric vehicle 1 according to the present embodiment are known to those skilled in the art and will not be described in detail herein.

[0105] The following explanations are given using Comparative Example 1 and Examples 1 to 3, Comparative Example 2 and Examples 4 to 5, and Comparative Example 3 and Examples 6 to 7. The power battery pack 10 according to the examples of the present application is improved in aspects such as energy density by designing the arrangement and dimensional parameters of the cells 100.

[0106] In the following examples and comparative examples, a lithium iron phosphate battery with a power of 73 kWh is used as an example.

[0107] In Comparative Example 1 and Examples 1 to 3, the total volume of the power battery pack is 213 L, with the length of the pack body = 1380, width = 1005, and thickness = 13. The sum of the volume of the case including the tray and top cover and the volume occupied by the internal battery management system and other power distribution modules is 58 L, and the volume actually remaining to accommodate the single cells and / or width-direction cross beams or length-direction cross beams is 155 L. Comparative Example 1

[0108] As shown in FIG. 1, a power battery pack 10′ according to the prior art has two widthwise cross beams 500′ and one lengthwise cross beam 600′ provided within a pack body 200″, and the two widthwise cross beams 500′ and one lengthwise cross beam 600′ separate the cells into six assembled batteries 400′, each of which has its own assembled battery case. [Example]

[0109] In a battery pack 10 according to an embodiment of the present application, as shown in FIG. 12 , the cells 100 are arranged such that their longitudinal direction is along the width direction B of the power battery pack, and a plurality of the cells 100 are arranged along the longitudinal direction A of the power battery pack 10, and the pack body 200 accommodates two cells 100 in the width direction B of the power battery pack. One width-direction cross beam 500 and one length-direction cross beam 600 are provided within the pack body 200, and the width-direction cross beam 500 extends along the width direction B of the power battery pack 10, and the plurality of cells 100 are arranged along the longitudinal direction A of the power battery pack 10 to form a battery array, and the width-direction cross beam 500 divides the battery array into two parts along the longitudinal direction A of the power battery pack 10. The plurality of cells 100 are arranged as two rows of battery arrays along the width direction B of the power battery pack, and the length-direction cross beam 600 is located between the two adjacent rows of battery arrays. The first beam 201 and the second beam 202 of the pack body 200 located on both sides in the width direction B of the power battery pack 10 provide a supporting force to the cells 100, and the third beam 203 and the fourth beam 204 of the pack body 200 located on both sides in the longitudinal direction A of the power battery pack 10 provide an inward pressing force to the adjacent cells 100. The battery array of the power battery pack 10 is not provided with end plates or side plates. [Example]

[0110] 13 , in a power battery pack 10 according to an embodiment of the present application, the cell 100 is arranged such that its longitudinal direction is along the width direction B of the power battery pack, and a plurality of the cells 100 are arranged along the longitudinal direction A of the power battery pack 10, and the pack body 200 accommodates one cell 100 in the width direction B of the power battery pack, and the cell 100 extends from one side to the other of the pack body 200 in the width direction B of the power battery pack 10. One width-direction cross beam 500 is provided in the pack body 200, and no length-direction cross beam 600 is provided, and the width-direction cross beam 500 extends along the width direction B of the power battery pack 10, and the plurality of cells 100 are arranged along the longitudinal direction A of the power battery pack 10 to form a battery array, and the width-direction cross beam 500 divides the battery array into two parts along the longitudinal direction A of the power battery pack 10. The first beam 201 and the second beam 202 of the pack body 200 located on both sides in the width direction B of the power battery pack 10 provide a supporting force to the cells 100, and the third beam 203 and the fourth beam 204 of the pack body 200 located on both sides in the longitudinal direction A of the power battery pack 10 provide an inward pressing force to the adjacent cells 100. The battery array of the power battery pack 10 is not provided with end plates or side plates. [Example]

[0111] In a power battery pack 10 according to an embodiment of the present application, as shown in FIG. 14 , a cell 100 is arranged such that its longitudinal direction is along the width direction B of the power battery pack, and a plurality of cells 100 are arranged along the longitudinal direction A of the power battery pack 10. A pack body 200 accommodates one cell 100 in the width direction B of the power battery pack, and the cell 100 extends from one side of the pack body 200 to the other in the width direction B of the power battery pack 10. No transverse cross beams 500 or longitudinal cross beams 600 are provided within the pack body 200. A first beam 201 and a second beam 202 of the pack body 200, located on both sides of the width direction B of the power battery pack 10, provide support for the cell 100, and a third beam 203 and a fourth beam 204 of the pack body 200, located on both ends of the longitudinal direction A of the power battery pack 10, provide inward pressing forces to adjacent cells 100. The battery array of the power battery pack 10 does not have end plates or side plates.

[0112] As those skilled in the art will understand by comparing the above Comparative Example 1 with Examples 1 to 3, compared to the power battery pack 10' in the prior art, the power battery pack 10 according to the embodiment of the present application can achieve a higher energy density by designing the arrangement, dimensional parameters and other factors of the cells 100 so that the space utilization rate can overcome the limitations of the conventional power battery packs.

[0113] In Comparative Example 2 and Examples 4 to 5, the total volume of the power battery pack is 310 L, with the length of the pack body = 1580, width = 1380, and thickness = 137. The sum of the volume of the case including the tray and top cover and the volume occupied by the internal battery management system and other power distribution modules is 89 L, and the volume actually remaining to accommodate the single cells and / or width-direction cross beams or length-direction cross beams is 221 L. Comparative Example 2

[0114] As shown in FIG. 1, a power battery pack 10′ according to the prior art has two widthwise cross beams 500′ and one lengthwise cross beam 600′ provided within a pack body 200″, and the two widthwise cross beams 500′ and one lengthwise cross beam 600′ divide the cells into six battery modules 400′, each of which has side panels and end panels. [Example]

[0115] 15 , in a power battery pack 10 according to an embodiment of the present application, the length of each cell 100 is arranged along the length direction A of the power battery pack, and multiple cells 100 are arranged along the width direction B of the power battery pack 10. The pack body 200 accommodates one cell 100 in the length direction A of the power battery pack, and the cell 100 extends from one side of the pack body 200 to the other in the length direction A of the power battery pack 10. One longitudinal cross beam 600 is provided in the pack body 200, and no width cross beam 500 is provided. The longitudinal cross beam 600 extends along the length direction A of the power battery pack 10, and multiple cells 100 are arranged along the width direction B of the power battery pack 10 to form a battery array, and the longitudinal cross beam 600 divides the battery array into two parts along the width direction B of the power battery pack 10. The third beam 203 and the fourth beam 204 of the pack body 200 located at both ends in the longitudinal direction A of the power battery pack 10 provide support to the cells 100, and the first beam 201 and the second beam 202 of the pack body 200 located on both sides in the width direction B of the power battery pack 10 provide inward pressing force to the adjacent cells 100. The battery array of the power battery pack 10 is not provided with end plates or side plates. [Example]

[0116] In a power battery pack 10 according to an embodiment of the present application, as shown in FIG. 16 , a cell 100 is arranged such that its length is aligned with the longitudinal direction A of the power battery pack, and multiple cells 100 are arranged along the width direction B of the power battery pack 10. A pack body 200 accommodates one cell 100 in the longitudinal direction A of the power battery pack, and the cell 100 extends from one side of the pack body 200 to the other in the longitudinal direction A of the power battery pack 10. No width-direction cross beams 500 or length-direction cross beams 600 are provided within the pack body 200. A third beam 203 and a fourth beam 204 of the pack body 200, located at both ends of the longitudinal direction A of the power battery pack 10, provide support to the cell 100, and a first beam 201 and a second beam 202 of the pack body 200, located at both ends of the width direction B of the power battery pack 10, provide inward pressing forces to adjacent cells 100. The battery array of the power battery pack 10 does not have end plates or side plates.

[0117] In Comparative Example 3 and Example 6, the total volume of the power battery pack is 414 L, with the length of the pack body = 2130, width = 1380, and thickness = 137. The sum of the volume of the case including the tray and top cover and the volume occupied by the internal battery management system and other power distribution modules is 58 L, and the volume actually remaining to accommodate the cells and / or width-direction cross beams or length-direction cross beams is 312 L.

[0118] In Example 7, the total volume of the power battery pack is 508 L, with the length of the pack body = 2630, width = 1380, and thickness = 137. The sum of the volume of the case including the tray and top cover, and the volume occupied by the internal battery management system and other power distribution modules is 119 L, leaving a volume of 389 L that can actually accommodate the cells and / or the transverse or longitudinal cross beams. Comparative Example 3

[0119] As shown in FIG. 1, a power battery pack 10′ according to the prior art has two widthwise cross beams 500′ and one lengthwise cross beam 600′ provided within a pack body 200″, and the two widthwise cross beams 500′ and one lengthwise cross beam 600′ separate the cells into six assembled batteries 400′, each of which has its own assembled battery case. [Example]

[0120] and [Example]

[0121] In a power battery pack 10 according to an embodiment of the present application, as shown in FIG. 16 , a cell 100 is arranged such that its length is aligned with the longitudinal direction A of the power battery pack, and multiple cells 100 are arranged along the width direction B of the power battery pack 10. A pack body 200 accommodates one cell 100 in the longitudinal direction A of the power battery pack, and the cell 100 extends from one side of the pack body 200 to the other in the longitudinal direction A of the power battery pack 10. No width-direction cross beams 500 or length-direction cross beams 600 are provided within the pack body 200. A third beam 203 and a fourth beam 204 of the pack body 200, located at both ends of the longitudinal direction A of the power battery pack 10, provide support to the cell 100, and a first beam 201 and a second beam 202 of the pack body 200, located at both ends of the width direction B of the power battery pack 10, provide inward pressing forces to adjacent cells 100. The battery array of the power battery pack 10 does not have end plates or side plates.

[0122] Table 1 shows specific parameters for Examples 1 to 7 and Comparative Examples 1 to 3. [Table 1]

[0123] As those skilled in the art will understand by comparing the above Comparative Example 1 with Examples 1 to 3, compared to the power battery pack 10' in the prior art, the power battery pack 10 according to the embodiment of the present application can achieve a higher energy density by designing the arrangement, dimensional parameters and other factors of the cells 100 so that the space utilization rate can overcome the limitations of the conventional power battery packs.

[0124] As those skilled in the art will understand by comparing Comparative Example 2 with Examples 4-5, and Comparative Example 3 with Examples 6-7, the power battery pack 10 according to the present invention achieves higher energy density by overcoming the limitations of conventional power battery packs in terms of space utilization through the design of the arrangement, dimensional parameters, and other factors of the cells 100. Furthermore, this improvement in energy density increases with the increase in the total volume of the power battery pack; that is, the larger the volume of the power battery pack, the more significant the effect of improving energy density achieved by the technical means of the present invention.

[0125] In the description herein, a description that refers to the term "specific example," "example," or the like means that the specific feature, structure, material, or characteristic described in combination with the example or example is included in at least one example or example of the present application. In the description herein, exemplary expressions of the above terms are not necessarily limited to the same example or example.

[0126] Although the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that 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]

[0127] In the prior art, Power battery pack 10', pack body 200'', battery module 400', longitudinal cross beam 600', widthwise cross beam 500' In this application, Electric vehicle 1, power battery pack 10, single cell 100, battery body 110, pack body 200, tray 210, upper cover 220, first side beam 201, second side beam 202, first end beam 203, second end beam 204, exhaust passage 222, intake port 221, battery array 400, first terminal 101, second terminal 102, explosion-proof valve 103, longitudinal cross beam 600, width cross beam 500, longitudinal direction A of power battery pack 10, width direction B of power battery pack 10, height direction C of battery power pack 10, length L of battery body 110, width H of battery body 110, thickness D of battery body 110, width W of vehicle body, width F of pack body 200.

Claims

1. The pack itself, a plurality of cells arranged directly within the pack body, the cells extending from a first side of the pack body to a second side of the pack body, the first side and the second side being opposed to each other; A power battery pack, characterized in that a first side wall is provided on a first side of the pack body and a second side wall is provided on a second side thereof, and one end of each of the cells is supported by the first side wall and the other end is supported by the second side wall.

2. 2. The power battery pack according to claim 1, wherein the first side and the second side are located at edges of the pack body.

3. 2. The power battery pack according to claim 1, wherein the longitudinal direction of the unit cells extends along the width direction of the pack body, the first side is one side along the width direction of the pack body, and the second side is the other side along the width direction of the pack body.

4. The sum V1 of the volumes of the plurality of single cells and the volume V2 of the power battery pack are expressed as follows: V1 / V2≧55% 2. The power battery pack according to claim 1, wherein:

5. V1 / V2≧60% 5. The power battery pack according to claim 4, wherein:

6. A storage space is formed in the pack body, the plurality of unit cells are directly aligned and disposed in the storage space, and the sum V1 of the volumes of the plurality of unit cells and the volume V0 of the storage space are 81%≦V1 / V0≦97% 2. The power battery pack according to claim 1, wherein:

7. A storage space is formed within the pack body, the plurality of unit cells are directly aligned and disposed within the storage space, the storage space has a bottom surface, and a sum S1 of areas of orthogonal projections of the plurality of unit cells on the bottom surface and an area S0 of the bottom surface are expressed as follows: 72%≦S1 / S0≦88% 2. The power battery pack according to claim 1, wherein:

8. the longitudinal direction of the unit cell is arranged along the width direction of the power battery pack, and the plurality of unit cells are arranged along the longitudinal direction of the power battery pack; 2. The power battery pack according to claim 1, wherein the pack body accommodates only one of the unit cells in the width direction of the power battery pack.

9. the longitudinal direction of the unit cell is arranged along the width direction of the power battery pack, and the plurality of unit cells are arranged along the longitudinal direction of the power battery pack; In the width direction of the power battery pack, the closest distance between one end of the unit cell and the adjacent side beam of the pack body is L1, the closest distance between the other end of the unit cell and the adjacent side beam of the pack body is L2, and the length L0 of the unit cell is: L1+L2<L0 2. The power battery pack according to claim 1, wherein:

10. the longitudinal direction of the unit cell is arranged along the width direction of the power battery pack, and the plurality of unit cells are arranged along the longitudinal direction of the power battery pack; The power battery pack according to claim 1, wherein the cells extend from one side to the other side of the pack body along the width direction of the power battery pack.

11. the pack body includes side beams located on both sides of the power battery pack in a width direction, and both ends of the unit cells in a longitudinal direction are supported by the side beams; The power battery pack according to any one of claims 8 to 10, wherein the pack body includes end beams located at both ends of the power battery pack in the longitudinal direction, and the end beams provide an inward pressing force against adjacent cells.

12. The power battery pack according to any one of claims 1 to 10, wherein the unit cells are arranged such that their longitudinal direction is along the width direction of the power battery pack, the plurality of unit cells are arranged along the longitudinal direction of the power battery pack, and the pack body includes at least two layers of battery arrays along the height direction of the power battery pack.

13. the longitudinal direction of the unit cell is arranged along the longitudinal direction of the power battery pack, and the plurality of unit cells are arranged along the width direction of the power battery pack; 2. The power battery pack according to claim 1, wherein the pack body accommodates only one of the unit cells in the longitudinal direction of the power battery pack.

14. the longitudinal direction of the unit cell is arranged along the longitudinal direction of the power battery pack, and the plurality of unit cells are arranged along the width direction of the power battery pack; In the longitudinal direction of the power battery pack, the closest distance between one end of the unit cell and the adjacent end beam of the pack body is L3, the closest distance between the other end of the unit cell and the adjacent end beam of the pack body is L4, and the length L0 of the unit cell is: L3+L4<L0 2. The power battery pack according to claim 1, wherein:

15. the longitudinal direction of the unit cell is arranged along the longitudinal direction of the power battery pack, and the plurality of unit cells are arranged along the width direction of the power battery pack; 2. The power battery pack according to claim 1, wherein the unit cells extend from one end to the other end of the pack body along the longitudinal direction of the power battery pack.

16. the pack body includes end beams located at both ends of the power battery pack in a longitudinal direction, and both ends of the unit cells in the longitudinal direction are supported by the end beams; The power battery pack according to any one of claims 13 to 15, wherein the pack body includes side beams located on both sides in a width direction of the power battery pack, and the side beams provide an inward pressing force to the adjacent cells.

17. The power battery pack according to any one of claims 13 to 15, wherein the unit cells are arranged such that their longitudinal direction is along the longitudinal direction of the power battery pack, the plurality of unit cells are arranged along the width direction of the power battery pack, and the pack body includes at least two layers of battery arrays along the height direction of the power battery pack.

18. The power battery pack according to any one of claims 1 to 10 and 13 to 15, wherein the pack body includes a vehicle tray that is connected to a vehicle body.

19. The power battery pack according to any one of claims 1 to 110 and 13 to 15, wherein the width F of the pack body in the width direction of the power battery pack is 500 mm to 1500 mm.

20. The power battery pack according to any one of claims 1 to 110 and 13 to 15, further comprising a battery management system and / or a battery thermal management system.

21. The power battery pack according to any one of claims 1 to 10 and 13 to 15, wherein the pack body is formed in an electric vehicle.

22. The power battery pack is arranged so that its width direction is along the width direction of the vehicle body and its length direction is along the length direction of the vehicle body, or The power battery pack according to any one of claims 1 to 10 and 13 to 15, characterized in that the power battery pack is arranged so that its width direction is aligned with the longitudinal direction of the vehicle body and its longitudinal direction is aligned with the width direction of the vehicle body.

23. The cell includes a battery body having a length L, a width H, and a thickness D, the length L of the battery body being greater than the width H, the width H of the battery body being greater than the thickness D, and the length L and the width H of the battery body being L / H = 4 to 21 The power battery pack according to any one of claims 1 to 10 and 13 to 15, wherein the above conditions are satisfied.

24. The power battery pack according to any one of claims 1 to 10 and 13 to 15, characterized in that the single battery includes a battery body, and the length L of the battery body and the thickness D of the battery body satisfy L / D = 23 to 208.

25. The single cell includes a battery body, and the length L of the battery body and the volume V of the battery body are expressed as follows: L / V=0.0005~0.002mm －２ The power battery pack according to any one of claims 1 to 10 and 13 to 15, wherein the above conditions are satisfied.

26. The single battery includes a battery body, and the width H of the battery body and the volume V of the battery body are expressed as follows: H / V=0.0001~0.00015mm －２ The power battery pack according to any one of claims 1 to 10 and 13 to 15, wherein the above conditions are satisfied.

27. The single battery includes a battery body, and the thickness D of the battery body and the volume V of the battery body are expressed as follows: D / V=0.0000065~0.00002mm －２ The power battery pack according to any one of claims 1 to 10 and 13 to 15, wherein the above conditions are satisfied.

28. The single cell includes a battery body, and the length L of the battery body and the surface area S of the battery body are expressed as follows: L / S=0.002~0.005mm －１ The power battery pack according to any one of claims 1 to 10 and 13 to 15, wherein the above conditions are satisfied.

29. The single cell includes a battery body, and the surface area S of the battery body and the volume V of the battery body are expressed as follows: S / V=0.1~0.35mm －１ The power battery pack according to any one of claims 1 to 10 and 13 to 15, wherein the above conditions are satisfied.

30. The power battery pack according to any one of claims 1 to 10 and 13 to 15, wherein the single cell includes a battery body, and the length L of the battery body is 600 mm to 2500 mm.

31. The power battery pack according to any one of claims 1 to 10 and 13 to 15, wherein the unit cells are aluminum-shell prismatic batteries, and include a battery body and an explosion-proof valve, and the explosion-proof valve is provided at at least one end of the battery body in the longitudinal direction.

32. The power battery pack according to any one of claims 1 to 10 and 13 to 15, wherein the single battery includes a battery body, and explosion-proof valves are provided at both ends of the battery body in the longitudinal direction, and the explosion-proof valves at both ends of the battery body are vented through different exhaust passages.

33. An electric vehicle comprising the power battery pack according to any one of claims 1 to 32.

34. 34. The electric vehicle according to claim 33, wherein the power battery pack is installed at the bottom of the electric vehicle, and the pack body is fixedly connected to the chassis of the electric vehicle.

35. 35. The electric vehicle according to claim 33 or 34, wherein the electric vehicle includes one power battery pack provided at the bottom of the electric vehicle, and the power battery pack is arranged so that its width direction is aligned with the width direction of a body of the electric vehicle and its length direction is aligned with the length direction of the body of the electric vehicle.

36. 36. The electric vehicle according to claim 35, wherein the width F of the pack body and the width W of the vehicle body satisfy the relationship 50%≦F / W≦80%.

37. 37. The electric vehicle according to claim 36, wherein the single battery includes a battery body, and the length L of the battery body in the width direction of the power battery pack and the width W of the vehicle body satisfy 46%≦L / W≦76%.

38. 38. The electric vehicle according to claim 36 or 37, wherein the width W of the vehicle body is 500 mm to 2000 mm.

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