Power battery packs and electric vehicles

Abstract

The present invention provides a power battery pack that is fixed to an electric vehicle and supplies power to it, as well as an electric vehicle. [Solution] The power battery pack includes a pack body and a plurality of single cells provided inside the pack body, each having a length L0, a width H0, and a thickness D0, and at least one single cell satisfies L0>H0≧D0 and is arranged so that its longitudinal direction is aligned with the width direction of the electric vehicle body, and in the width direction of the electric vehicle, the sum of the lengths L0 of the single cells and the dimension W in the width direction of the electric vehicle body is 46%≦L0 / W≦76%, or at least one single cell satisfies L0>H0≧D0 and is arranged so that its longitudinal direction is aligned with the longitudinal direction of the electric vehicle body, and in the longitudinal direction of the electric vehicle, the sum of the lengths L0 of the single cells and the dimension X in the longitudinal direction of the electric vehicle body is 40%≦L0 / X≦76%. [Effect] The power battery pack of the present invention can improve energy density and enhance cruising range without increasing the occupied space.

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims the priority of Chinese Patent Application Nos. "201910021244.0", "201910020967.9", "201910021246.X", "201910021248.9", "201910021247.4" and "201910020925.5" with the title of invention "Battery Pack, Vehicle and Energy Storage Device" filed by BYD Company Limited on January 9, 2019, and all of its contents are incorporated herein by reference.

[0002] This application relates to the technical field of batteries, specifically to power battery packs and electric vehicles having the power battery packs.

Background Art

[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 consists of a plurality of single cells.

[0004] As the user's requirements for the cruising range of electric vehicles are gradually increasing, when the space at the bottom of the vehicle body is limited, if the power battery pack in the prior art is adopted, the utilization rate of the internal space will be low, and the energy density of the power battery pack cannot meet the demand, which has also become an important factor restricting the development of electric vehicles.

Summary of the Invention

[0005] In the above-mentioned prior art, as shown in Figure 1, the pack body 200'' of the power battery pack 10′ is often divided into mounting areas for multiple battery modules 400′ by a cross beam 500′ and a side beam 600′, and the battery modules 400′ are fixed to the cross beam 500′ or the side beam 600′ by screws or the like. The battery module 400′ includes multiple single cells arranged in sequence, and the multiple single cells are arranged to form a battery array, and end plates and / or side plates are provided on the outside of the battery array, generally including both end plates and side plates, which are fixed and surround the space that houses the battery array. At the same time, the end plates and side plates are connected by screws or by other connecting members such as tie rods in order to fix the battery array.

[0006] The applicant found through testing and analysis that, because the battery module 400' is fixed to the cross beam 500' or side beam 600' by a structure such as screws, space is wasted, and the weight increases due to the increase in connecting members such as screws. Furthermore, because the battery module 400' is designed with a combination of end plates and side plates, and both the end plates and side plates have a certain thickness and height, space inside the pack body 200'' is wasted, resulting in a low volume utilization rate of the pack body 200''. In general, in the power battery pack 10' of the above prior art, the ratio of the sum of the volumes of the individual cells inside the pack body 200'' to the volume of the pack body 200'' is about 50%, and even lower, down to 40%.

[0007] When the space at the bottom of the vehicle body is limited, according to the power battery pack 10' of the above-described embodiment of the prior art, the end plates, side plates, and internal connection and mounting configurations of the battery module 400' and the power battery pack 10' all reduce the utilization rate of the internal space of the pack body 200''. As a result, in the power battery pack 10', the ratio of the sum of the volumes of the individual cells to the volume of the pack body 200'' is too low, reducing the energy density of the power battery pack.

[0008] This application aims to solve at least one of the technical problems in the prior art. Therefore, one of the objectives of this application is to provide a power battery pack that has advantages such as high space utilization rate, high energy density, and long range.

[0009] The present invention further provides an electric vehicle having the aforementioned power battery pack.

[0010] A power battery pack for supplying power to an electric vehicle according to an embodiment of the first aspect of the present application includes a pack body and a plurality of single cells provided within the pack body, wherein each single cell has a length L0, a width H0, and a thickness D0, and L0 > H0 ≥ D0, and when the power battery pack is placed in the electric vehicle, the single cell extends with its longitudinal direction along the width direction or longitudinal direction of the electric vehicle, and when the single cell extends with its longitudinal direction along the width direction of the electric vehicle, the length L0 of the single cell and the dimension W in the width direction of the body of the electric vehicle satisfy 46% ≤ L0 / W ≤ 76%, or when the single cell extends with its longitudinal direction along the longitudinal direction of the electric vehicle, the length L0 of the single cell and the dimension X in the longitudinal direction of the body of the electric vehicle satisfy 40% ≤ L0 / X ≤ 76%.

[0011] In the power battery according to the embodiment of the present invention, by limiting the ratio of the length of a single cell to the dimensions in the width direction and the longitudinal direction of the vehicle body, the power battery pack can make full use of the space in the vehicle body, arranging more single cells within a unit space of the vehicle body, that is, arranging more energy supply structures within a unit space, thereby improving energy density and improving driving range without increasing the occupied space.

[0012] Additional aspects and advantages of the present application are, in part, shown in the following description, in part, revealed in the following description, or as obtained through the practice of the present application. [Brief explanation of the drawing]

[0013] The above and / or additional aspects and advantages of the present application will be made clearer and easier to understand by describing the embodiments with reference to the drawings. [Figure 1] This is an exploded view of a conventional power battery pack. [Figure 2] This is a cross-sectional view of a power battery pack according to an embodiment of the present application. [Figure 3] This is a perspective view of a power battery pack according to an embodiment of the present invention. [Figure 4] This is an exploded view of a power battery pack according to an embodiment of the present invention. [Figure 5] This is a schematic diagram of the single cell according to an embodiment of the present invention. [Figure 6] This is a schematic diagram of the arrangement of battery modules in a power battery pack according to an embodiment of the present invention. [Figure 7] This is a schematic diagram of the battery module arrangement method of a power battery pack according to another embodiment of the present invention. [Figure 8] This is a schematic diagram showing the pack body of a power battery pack according to an embodiment of the present invention, formed in an electric vehicle. [Figure 9] This is a schematic diagram of an electric vehicle according to an embodiment of the present invention. [Figure 10] This is an exploded view of an electric vehicle according to an embodiment of the present invention. [Figure 11] Figure 2 is an enlarged view of region G. [Figure 12] This is a perspective view of a power battery pack according to the first alternative embodiment of the present application. [Figure 13] This is a perspective view of a power battery pack according to a second alternative embodiment of the present application. [Figure 14] This is a perspective view of a power battery pack according to a third alternative embodiment of the present application. [Figure 15] This is a perspective view of a power battery pack according to a fourth alternative embodiment of the present application. [Figure 16] This is a perspective view of a power battery pack according to a fifth alternative embodiment of the present application. [Explanation of symbols]

[0014] In the prior art, power battery pack 10′, pack body 200′′, battery module 400′, side beam 600′, cross beam 500′ In the present application, electric vehicle 1, power battery pack 10, single battery 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, air inlet 221, battery module 400, first tab 101, second tab 102, explosion-proof valve 103, side beam 600, cross beam 500, longitudinal direction A of power battery pack 10, width direction B of power battery pack 10, height direction C of power battery pack 10, length L0 of single battery 100, width H0 of single battery, thickness D0 of single battery, 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.

Embodiments for Carrying out the Invention

[0015] Hereinafter, embodiments of the present application will be described in detail. Examples of the above embodiments are shown in the drawings, and the same or similar reference numerals throughout denote the same or similar components, or components having the same or similar functions. Hereinafter, the embodiments described with reference to the drawings are exemplary only and should be understood as merely interpreting the present application and not limiting the present application.

[0016] In the description of the present application, the orientation or positional relationship indicated by terms such as “vertical direction”, “horizontal direction”, “length”, “width”, “thickness”, “inside”, “outside”, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of easily explaining the present application and simplifying the description, and does not indicate or imply that the shown device or component must have a specific orientation and be configured and operate in a specific orientation, so it should not be understood as limiting the present application.

[0017] Also, in the description of the present application, “a plurality” means two or more.

[0018] Taking into consideration the current state of conventional power battery packs, this 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 high driving range.

[0019] The power battery pack 10 according to an embodiment of the present application will be described below with reference to the drawings.

[0020] As shown in Figures 2 to 16, the power battery pack 10 according to the embodiment of the present application includes a pack body 200 and a plurality of individual batteries 100. The power battery pack 10 supplies power to an electric vehicle 1, and the electric vehicle includes, but is not limited to, electric cars, trains, electric bicycles, and golf carts. According to the specific embodiment of the present application, the power battery 10 is fixed to the electric vehicle.

[0021] Multiple single cells 100 are provided within a pack body 200, which can be understood as a case for housing multiple single cells 100, and may include, for example, a tray 210 and an upper cover 220, both of which define a housing space for multiple single cells 100, and the multiple single cells 100 are provided in the tray 210 and covered by the upper cover 220, that is, they are provided within the housing space formed by the tray 210 and the upper cover 220. The length L0 of a single cell and the dimension W in the width direction of the electric vehicle body satisfy 46% ≤ L0 / W ≤ 76%, or the length L0 of the single cell and the dimension X in the longitudinal direction of the electric vehicle body satisfy 40% ≤ L0 / X ≤ 76%.

[0022] In some specific embodiments, if the cell 100 extends along the width direction of the electric vehicle body, the length L0 of the cell and the dimension W in the width direction of the electric vehicle body satisfy 46% ≤ L0 / W ≤ 76%. In some other specific embodiments, if the cell 100 extends along the length direction of the electric vehicle body, the length L0 of the cell and the dimension X in the longitudinal direction of the electric vehicle body satisfy 40% ≤ L0 / X ≤ 76%.

[0023] As a person skilled in the art would understand, the width direction of the vehicle body refers to the left-right direction of the vehicle, the dimension W in the width direction of the vehicle body refers to the width of the vehicle body, the longitudinal direction of the vehicle body refers to the direction of travel of the vehicle, and the dimension X in the longitudinal direction of the vehicle body refers to the length of the vehicle body.

[0024] In the power battery pack 10 according to the embodiment of the present invention, by limiting the ratio of the length of a single cell 100 to the dimension W in the width direction of the vehicle body, i.e., 46% ≤ L0 / W ≤ 76%, or by limiting the ratio of the length of a single cell 100 to the dimension X in the longitudinal direction of the vehicle body, i.e., 40% ≤ L0 / X ≤ 76%, the power battery pack 10 can make full use of the space of the vehicle body and arrange more single cells 100 within the unit space of the vehicle body, i.e., arrange more energy supply structures within the unit space, thereby improving energy density and improving driving range without expanding the occupied space.

[0025] In some embodiments of the present application, in order to improve energy density and driving range, the sum of the volumes V1 of the multiple single cells 100 and the volume V2 of the power battery pack 10 satisfy V1 / V2 ≥ 55%, in some embodiments of the present application, the sum of the volumes V1 of the multiple single cells 100 and the volume V2 of the power battery pack 10 satisfy V1 / V2 ≥ 60%, in some embodiments of the present application, the sum of the volumes V1 of the multiple single cells 100 and the volume V2 of the power battery pack 10 satisfy V1 / V2 ≥ 62%, and in some embodiments of the present application, the sum of the volumes V1 of the multiple single cells 100 and the volume V2 of the power battery pack 10 satisfy V1 / V2 ≥ 65%. Note that V2 is the total volume of the three-dimensional shape defined by the outer shell of the power battery pack 10, that is, the volume including the internal space of the power battery pack 10, that is, the volume of the three-dimensional region enclosed in space by the outer shell of the power battery pack 10. In electric vehicles, V1 / V2 can be understood as space utilization rates.

[0026] 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%.

[0027] 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.

[0028] 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, which helps to set the space utilization rate of the power battery pack 10 to 55%, 60%, 62%, 65% or more.

[0029] 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 (this 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 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.

[0030] 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.

[0031] To make it easier to understand, 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 longitudinal direction A of the power battery pack 10 are end beams.

[0032] In some specific examples of the present invention, as shown in Figures 3 and 4, the length of the single cell 100 extends across the entire width direction B of the power battery pack 10, that is, along the width direction B of the power battery pack 10, the single cell 100 extends from one side to the other of the pack body 200, the length of the single cell 100 fills the width direction B of the power battery pack 10, the pack body 200 cannot accommodate two or more single cells 100 in the width direction B of the power battery pack 10, and both longitudinal ends of the single cell 100 fit into the side walls of the pack body 200 facing the width direction B, for example, and can be fixed to the pack body 200. This eliminates the need for crossbeams and side beams inside the pack body 200, and the connected single cells 100 directly act as reinforcing ribs, significantly simplifying the structure of the pack body 200 and improving space utilization by reducing the space occupied by the reinforcing ribs and the mounting structure of the single cells 100, thereby improving the range.

[0033] Naturally, the embodiments of the present application are not limited to those without crossbeams and side beams. In some embodiments of the present application, as shown in Figure 13, a crossbeam 500 can be provided within the pack body 200, the crossbeam 500 extending along the width direction B of the power battery pack 10, and a plurality of single cells 100 arranged along the longitudinal direction A of the power battery pack 10 to form a battery array. The crossbeam 500 divides the battery array into at least two parts along the longitudinal direction A of the power battery pack 10, and each part of the battery array contains at least one single cell 100 and constitutes one battery module 400.

[0034] Naturally, in some other embodiments of the present invention, a side beam 600 may be provided within the pack body 200, as shown in Figure 12, the side beam 600 extending along the longitudinal direction A of the power battery pack 10, the single cell 100 being arranged such that its longitudinal direction is along the width direction B of the power battery pack 10, and a plurality of single cells 100 being arranged along the longitudinal direction A of the power battery pack 10 to form a battery array, with at least two rows of battery arrays arranged within the pack body 200 along the width direction B of the power battery pack 10, each row of battery arrays comprising a plurality of power single cells 100 arranged along the longitudinal direction A of the power battery pack 10, and the side beam 600 being located between two adjacent rows of battery arrays.

[0035] In some specific examples of the present invention, the pack body 200 includes side beams located on both sides of the power battery pack 10 in the width direction B, and the longitudinal ends of the single cell 100 are supported by the side beams, and the pack body 200 includes end beams located on both ends of the power battery pack 10 in the longitudinal direction A, and the end beams provide an inward pressing force to adjacent single cell 100.

[0036] As shown in Figures 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 order from head to tail. The first side beam 201 and the second side beam 202 face 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 face 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 single cell 100 in the longitudinal direction, that is, one end of the single 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 force to both sides of the cell 100 in the thickness direction; that is, the first end beam 203 applies a force toward the second end beam 204 to a cell 100 adjacent to the first end beam 203, and the second end beam 204 applies a force toward the first end beam 203 to a cell 100 adjacent to the second end beam 204. In this way, multiple cell 100s 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 bonded to one another. Furthermore, the first end beam 203 and the second end beam 204 restrict the position of multiple single cells 100 in the longitudinal direction A of the power battery pack 10. In particular, if a single cell 100 expands slightly, they act as a buffer against the single cell 100, providing inward pressure to prevent the expansion and deformation of the single cell 100 from becoming too large.

[0037] 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, the energy density is improved, and it is easy to realize the integration of BIC and low-voltage samplers.

[0038] 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, which helps to set the space utilization rate of the power battery pack 10 to 50%, 60%, 62%, 65% or more.

[0039] 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 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 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, another additional single battery 100 cannot be accommodated.

[0040] 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.

[0041] To make it easier to understand, 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 longitudinal direction A of the power battery pack 10 are end beams.

[0042] In some specific examples of the present invention, as shown in Figures 15 and 16, the length of a single cell 100 extends along the entire longitudinal direction A of the power battery pack 10, that is, along the longitudinal direction A of the power battery pack 10, the single cell 100 extends from one end to the other of the pack body 200, the length of the single cell 100 fills the longitudinal direction A of the power battery pack 10, the pack body 200 cannot accommodate two or more single cells 100 in the longitudinal direction A of the power battery pack 10, and the longitudinal ends of the single cell 100 can be fitted into the end wall of the pack body 200 facing the longitudinal direction A, for example, and fixed to the pack body 200. This eliminates the need for crossbeams and sidebeams inside the pack body 200, allowing the directly connected single cell 100 to act as reinforcing ribs. This significantly simplifies the structure of the pack body 200 and reduces the space occupied by the reinforcing ribs and the mounting structure of the single cell 100, thereby improving space utilization and increasing range.

[0043] Naturally, the embodiments of the present application are not limited to those without side beams and cross beams. In some embodiments of the present application, as shown in Figure 15, side beams 600 can be provided within the pack body 200, the side beams 600 extending along the longitudinal direction A of the power battery pack 10, and a plurality of single cells 100 arranged along the width direction B of the power battery pack 10 to form a battery array, the side beams 600 dividing the battery array into at least two parts along the width direction B of the power battery pack 10, each part of the battery array containing at least one single cell 100 and constituting one battery module 400.

[0044] Naturally, in some other embodiments of the present invention, a crossbeam 500 may be provided within the pack body 200, the crossbeam 500 extending along the width direction B of the power battery pack 10, the single cells 100 being arranged such that their longitudinal direction is along the longitudinal direction A of the power battery pack 10, and a plurality of single cells 100 being arranged along the width direction B of the power battery pack 10 to form a battery array, with at least two rows of battery arrays arranged within the pack body 200 along the longitudinal direction A of the power battery pack 10, each row of battery arrays comprising a plurality of single cells 100 arranged along the width direction B of the power battery pack 10, and the crossbeam 500 being located between two adjacent rows of battery arrays.

[0045] In some specific examples of the present invention, the pack body 200 includes end beams located at both ends in the longitudinal direction A of the power battery pack 10, and the longitudinal ends of the single cells 100 are supported by the end beams, and the pack body 200 includes side beams located on both sides in the width direction B of the power battery pack 10, and the side beams provide an inward pressing force to adjacent single cells 100.

[0046] As shown in Figure 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 order. The first side beam 201 and the second side beam 202 face 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 face 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 single cell 100 in the longitudinal direction, that is, one end of the single 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 force to both sides of the cell 100 in the thickness direction, that is, the first side beam 201 applies a force toward the second side beam 202 to a cell 100 provided adjacent to the first side beam 201, and the second side beam 202 applies a force toward the first side beam 201 to a cell 100 provided adjacent to the second side beam 202, so that multiple cell 100s 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 bonded to one another. Furthermore, the first side beam 201 and the second side beam 202 can position multiple single cells 100 in the width direction B of the power battery pack 10. In particular, if a single cell 100 expands slightly, they play a role in providing buffering and inward pressure to the single cell 100, thereby preventing the expansion and deformation of the single cell 100 from becoming too large.

[0047] In some specific examples of the present invention, as shown in Figure 15, the single cell 100 is arranged such that its longitudinal direction aligns with the longitudinal direction A of the power battery pack 10, and multiple single cells 100 are arranged along the width direction B of the power battery pack 10 to form a battery array, with at least two layers of battery arrays included within the pack body 200 along the height direction C of the power battery pack 10. This optimizes the number of single cells 100, thereby improving space utilization and energy density, and facilitating the integration of BICs and low-voltage samplers.

[0048] In some specific embodiments of the present invention, multiple single cells 100 can be assembled into multiple battery modules 400, which may be arranged along the longitudinal direction A of the power battery pack 10 (as shown in Figure 6), along the width direction B of the power battery pack 10 (as shown in Figure 15), or along the height direction C of the power battery pack 10 to form a multilayer structure (as shown in Figure 7). In other words, regardless of whether the single cells 100 extend along the width direction B or along the longitudinal direction A of the power battery pack 10, the multiple single cells 100 can be arranged in multiple layers along the height direction C of the power battery pack 10. Naturally, the multiple battery modules 400 may be arranged simultaneously along the longitudinal direction A and the height direction C of the power battery pack 10, or simultaneously along the width direction B and the height direction C of the power battery pack 10. This optimizes the number of battery modules 400, improving space utilization and energy density, and facilitating the integration of BICs and low-voltage samplers. What needs to be understood is that the battery module 400 in the embodiment of the present application is not provided with structures such as end plates and side plates.

[0049] In the prior art, the dimensions and length of a single cell are small, and the opposing ends of a single cell cannot be fitted into the two opposing side walls provided within the pack body 200''. Therefore, it is necessary to provide side beams 600' and / or cross beams 500' (shown in Figure 1) within the pack body 200'', thus simplifying the assembly of the single cell. After the single cell is installed in the pack body 200'' in the form of a battery module 400', multiple single cells are present along the width direction of the power battery pack 10'. That is, the single cell does not extend between the two opposing side walls, but rather between the two opposing side beams 600' or cross beams 500', and the battery module is fixed to the adjacent side beams 600' and / or cross beams 500' by fasteners.

[0050] In conventional technology, side beams 600' and / or cross beams 500' are provided within the pack body 200''. Because the side beams 600' and / or cross beams 500' occupy a large portion of the mounting space within the pack body 200'' for housing individual cells, the space utilization rate of the pack body 200'' is low. Generally, the ratio of the sum of the volumes of the individual cells to the volume of the pack body 200'' is about 40%, or even lower. In other words, in conventional technology, only about 40% of the space within the pack body 200'' is available for housing individual cells. As a result, the number of individual cells that can be housed in the pack body 200'' is limited, the overall capacity and voltage of the power battery pack 10' are restricted, and the driving range of the power battery pack 10' is low. In the prior art, the provision of side beams 600' and / or cross beams 500' within the pack body 200' means that side beams 600' are provided within the pack body 200', or that cross beams 500' are provided within the pack body 200', or that side beams 600' and cross beams 500' are provided simultaneously within the pack body 200'.

[0051] According to the embodiment of the present invention, the use of side beams and / or cross beams within the pack body 200 can be reduced, and it is even possible to not provide side beams and / or cross beams within the pack body 200. In this way, the space occupied by side beams and / or cross beams within the pack body 200 is reduced, improving the space utilization rate of the pack body 200. At the same time, the use of end plates and side plates within the battery module 400 is reduced, decreasing the space occupied by end plates and side plates within the pack body 200, and improving the space utilization rate of the pack body 200. By arranging as many single cells 100 as possible within the pack body 200, the overall capacity, voltage, and range of the power battery pack are improved. Reducing the use of side beams and / or cross beams within the pack body 200 means reducing the use of side beams within the pack body 200, or reducing the use of cross beams within the pack body 200, or reducing the use of side beams and cross beams within the pack body 200; not having side beams and / or cross beams within the pack body 200 means not having side beams within the pack body 200, or not having cross beams within the pack body 200, or not having side beams or cross beams within the pack body 200; reducing the space occupied by side beams and / or cross beams within the pack body 200 means reducing the space occupied by side beams within the pack body 200, or reducing the space occupied by cross beams within the pack body 200, or reducing the space occupied by side beams and cross beams within the pack body 200.

[0052] Furthermore, since there is no need to place side beams and / or cross beams within the pack body 200, the manufacturing process of the pack body 200 is simplified, the complexity of assembling the individual cells 100 is reduced, and production costs are lowered. At the same time, the weight of the pack body 200 and the entire power battery pack 10 is reduced, resulting in a lighter power battery pack 10. In particular, when the power battery pack 10 is installed in an electric vehicle, it can also improve the driving range of the electric vehicle and contribute to the weight reduction of the electric vehicle. The fact that there is no need to place side beams and / or cross beams within the pack body 200 means that there is no need to place side beams within the pack body 200, or there is no need to place cross beams within the pack body 200, or there is no need to place both side beams and cross beams within the pack body 200.

[0053] Furthermore, the single cell 100 itself is used to reinforce the structural strength of the pack body 200. That is, 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 single cell 100 itself ensures the structural strength of the pack body 200, ensuring that the pack body 200 is less likely to deform under external force. Compared to the battery pack disclosed in Chinese Patent Document CN107925028A, the pack body 200 not only houses and protects the single cell 100, but also supports the single cell 100, improving the overall load-bearing capacity of the power battery pack 10. The length of the single cell 100 also reinforces the strength of the power battery pack 10. In addition, increasing the surface area of ​​a single cell 100 increases the heat dissipation area of ​​the single cell 100, improving the heat dissipation rate of the single cell 100, further improving the overall safety of the power battery pack 10, making the power battery pack 10 safer and more reliable.

[0054] In some specific examples of this invention, a single cell 100 includes a battery body 110 (which can be understood as the main body portion excluding small protruding structures such as tabs), and the volume V of the battery body 110 and the energy E of the battery body 110 satisfy V / E ≤ 2000 mm³·Wh⁻¹. This not only ensures sufficient heat dissipation area and thus guarantees heat dissipation effectiveness, but also reduces the volume ratio of the single cell 100, which helps to make the arrangement of multiple single cells 100 in the power battery pack 10 more compact.

[0055] In some specific embodiments of the present application, as shown in Figures 9 and 10, the pack body 200 differs from the battery pack case disclosed in Chinese Patent Document CN107925028A, particularly in terms of dimensions and load-bearing characteristics, in that the pack body 200 may include a vehicle tray 210 that engages with and connects to the vehicle body / carriage to form a structure for housing and supporting single cells 100, the vehicle tray 210 being a independently manufactured tray for housing and mounting single cells 100. After the single cells 100 are mounted in the vehicle tray 210, the vehicle tray 210 can be attached to the vehicle body by fasteners, for example, by being suspended from the chassis of the electric vehicle to serve as housing and load-bearing.

[0056] When the power battery pack 10 is used as a power battery pack to supply electrical energy to a vehicle, the longitudinal direction of the single cell 100 may be arranged along the width direction or longitudinal direction of the electric vehicle body, that is, along the left-right direction or direction of travel of the vehicle. In this case, the length L of the battery body 110 of the single cell 100 may be 400 mm to 2500 mm so that the length of the single cell 100 matches the width direction or longitudinal direction of the vehicle.

[0057] In some specific examples of the present invention, as shown in Figure 8, the pack body 200 may be formed directly on the electric vehicle; that is, the pack body 200 is formed at any suitable location on the electric vehicle and is a device for mounting the single cell 100. For example, the pack body 200 may be formed on the chassis of the electric vehicle.

[0058] 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 further includes components necessary for a vehicle battery, such as at least one of a battery management system (BMS), a battery connector, a battery sampler, and a battery thermal management system, and the power battery pack 10 is installed such that its width B is aligned with the width direction of the electric vehicle body, i.e., the left-right direction of the vehicle, and its longitudinal direction is aligned with the longitudinal 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 installed such that its width B is aligned with the longitudinal direction of the electric vehicle body, and its longitudinal direction A is aligned with the width direction of the electric vehicle body.

[0059] As those skilled in the art will understand, the orientation of the single cell 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 single cell 100 may be positioned so that its longitudinal direction is aligned with the width direction B of the power battery pack 10, or so that its longitudinal direction is aligned with the longitudinal direction A of the power battery pack 10. The power battery pack 10 may be positioned so that its width direction B is aligned with the width direction of the electric vehicle body, or so that its width direction B is aligned with the longitudinal direction of the vehicle body. Furthermore, for example, regardless of whether the power battery pack 10 is positioned so that its width direction B is aligned with the width direction of the electric vehicle body or so that it is aligned with the longitudinal direction of the vehicle body, the single cell 100 may be positioned so that its longitudinal direction is aligned with the width direction of the electric vehicle body. The relative orientation of the single cell 100, the power battery pack 10, and the vehicle body can be set according to the actual application to satisfy different requirements.

[0060] A single cell 100 according to an embodiment of the present application will be described below with reference to the drawings.

[0061] In the following specific examples, the units of length L, width H, and thickness D are all millimeters (mm), the unit of surface area S is square millimeters (mm2), the unit of volume V is cubic millimeters (mm3), and the unit of energy E is watt-hours (Wh).

[0062] As shown in Figure 5, the single cell 100 according to the embodiment of the present application includes a battery body 110, which can be understood as the main body portion excluding small protruding structures such as tabs. The battery body 110 has a length L, a width H, and a thickness D.

[0063] According to embodiments of the present application, the length L of the battery body 110 is greater than the width H of the battery body 110, the width H of the battery body 110 is greater than the thickness D of the battery body 110, and the ratio of the length L of the battery body 110 to the width H of the battery body 110 satisfies L / H = 4 to 21. According to some other embodiments of the present application, the ratio of the length L of the battery body 110 to the width H of the battery body 110 satisfies L / H = 9 to 13.

[0064] The single cell 100 according to the embodiment of the present application can be rationally flattened with a constant volume by designing the ratio of the length L to the width H of the battery body 110, which is useful for the overall arrangement within the power battery pack (for example, 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 driving range of the power battery pack. At the same time, the single cell 100 is ensured to have a sufficiently large heat dissipation area, and internal heat is conducted to the outside in a timely manner, preventing heat from accumulating inside, thereby being suitable for high energy density and supporting improved driving range.

[0065] In some embodiments of the present application, in order to optimize the arrangement of single cells 100 within the power battery pack and improve the heat dissipation capacity of single cells 100, the length L and thickness D of the battery body 110 satisfy L / D = 23 to 208. According to some specific embodiments of the present application, the length L and thickness D of the battery body 110 satisfy L / D = 23 to 200. According to some specific embodiments of the present application, the length L and thickness D of the battery body 110 satisfy L / D = 50 to 70.

[0066] In some specific embodiments of the present invention, as shown in Figure 5, the battery body 110 is configured in a rectangular parallelepiped shape with a smooth outer surface to have a certain structural strength. For example, the battery electrodes are placed inside a rectangular battery case, the opening of the battery case is sealed with a cover plate, and the electrolyte is injected. Compared to batteries made of aluminum-plastic composite membranes, the single cell 100 according to the embodiments of the present invention 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 a higher space utilization rate and a simpler manufacturing and assembly process.

[0067] When the single cell 100 according to the embodiment of the present application is placed inside the pack body 200 of the power battery pack 10, the battery body 110 can extend horizontally in the longitudinal and thickness directions and vertically in the width direction, that is, the single cell 100 is placed upright, and both the horizontal and vertical directions are based on the direction in which the power battery pack 10 is used (for example, when applied to an electric vehicle).

[0068] In some specific examples of this invention, the arrangement of individual cells 100 within the power battery pack 10 is optimized to improve energy density and range, and other parameters of the individual cells 100 are designed to make the arrangement of the battery body 110 more compact and to concentrate energy more within the limited space of the pack body 200.

[0069] In some embodiments of the present application, the length L of the battery body 110 and the volume V of the battery body 110 satisfy L / V = 0.0005 mm⁻² to 0.002 mm⁻², in some embodiments of the present application, the width H of the battery body 110 and the volume V of the battery body 110 satisfy H / V = 0.0001 mm⁻² to 0.00015 mm⁻², and in some embodiments of the present application, the thickness D of the battery body 110 and the volume V of the battery body 110 satisfy D / V = 0.0000065 mm⁻² to 0.00002 mm⁻². Thus, by designing the ratio of the length L, width H, and thickness D to the volume V for a battery body 110 of a certain volume, the spatial distribution of a unit quantity of energy is optimized, which is thus useful for placement within the pack body 200.

[0070] In some embodiments of the present application, the length L of the battery body 110 and the surface area S of the battery body 110 satisfy L / S = 0.002 mm⁻¹ to 0.005 mm⁻¹, and in some embodiments of the present application, the length L of the battery body 110 and the energy E of the battery body 110 satisfy L / E = 0.8 mm·Wh⁻¹ to 2.45 mm·Wh⁻¹, and according to some embodiments of the present application, the length L of the battery body 110 and the energy E of the battery body 110 satisfy L / E = 1.65 mm·Wh⁻¹ to 2.45 mm·Wh⁻¹. In this way, the single cell 100 helps to straddle both opposing sides of the pack body 200 in its longitudinal direction, thereby improving the range of the power battery pack 10 and achieving both structural strength and heat dissipation effect of the single cell 100.

[0071] In some other examples of this invention, the surface area S of the battery body 110 and the volume V of the battery body 110 satisfy S / V = 0.1 to 0.35 mm⁻¹. This not only ensures sufficient heat dissipation area and thus guarantees heat dissipation effectiveness, but also reduces the volume ratio of individual cells 100, which helps to make the arrangement of multiple individual cells 100 in the power battery pack 10 more compact.

[0072] In a specific embodiment of the present invention, the surface area S of the battery body 110 and the energy E of the battery body 110 satisfy S / E ≤ 1000. For example, S / E ≤ 1000 mm²·Wh⁻¹. Thus, the heat dissipation from the surface of the single cell 100 is sufficient, and especially when the power battery employs a ternary or high-nickel ternary cathode material, it can be guaranteed that the heat inside the battery is conducted in a timely manner, which contributes to the safety of the battery. Furthermore, the single cell 100 in the embodiment of the present invention is a prismatic battery with a smooth outer surface, possesses a certain structural strength, has good metallic thermal conductivity, and is less difficult to process and assemble in the later stages compared to batteries that increase surface area by a corrugated shape.

[0073] In some specific embodiments of the present invention, as shown in Figure 5, the single cell 100 further includes a first tab 101 and a second tab 102.

[0074] The first tab 101 is provided at one end of the battery body 110 in the longitudinal direction, and the second tab 102 is provided at the other end of the battery body 110 in the longitudinal direction. In other words, the longitudinal direction of the single cell 100 may be the direction of the current inside the single cell 100, that is, the direction of the current inside the single cell 100 is as shown by arrow B. In this way, since the direction of the current is the same as the longitudinal direction of the single cell 100, the effective heat dissipation area of ​​the single cell 100 is larger and the heat dissipation efficiency is higher. Here, the first tab 101 may be the positive electrode tab of the single cell 100 and the second tab 102 may be the negative electrode tab of the single cell 100, or the first tab 101 may be the negative electrode tab of the single cell 100 and the second tab 102 may be the positive electrode tab of the single cell 100.

[0075] In some specific examples of the present invention, as shown in Figure 5, the single cell 100 further includes an explosion-proof valve 103.

[0076] The explosion-proof valve 103 is provided at at least one end of the battery body 110 in the longitudinal direction. If a single cell 100 malfunctions, the air pressure inside the single cell 100 increases, causing the explosion-proof valve 103 to open and prevent the single cell 100 from exploding.

[0077] As those skilled in the art will understand, the provision of the explosion-proof valve 103 can be applied not only to hard-case batteries such as aluminum-case batteries, but also to pouch batteries, and the explosion-proof valve 103 may be provided at a location other than the end of the battery body 100.

[0078] In some specific embodiments of the present invention, explosion-proof valves 103 are provided at both ends of the battery body 110 in the longitudinal direction.

[0079] For example, as shown in Figures 2, 5, and 11, an explosion-proof valve 103 is provided at the first end of the single cell 100 facing the first side beam 201, an exhaust passage 222 is provided inside the first side beam 201, an intake port 221 is provided at each position on the first side beam 201 corresponding to the explosion-proof valve 103 of each single cell 100, the intake port 221 communicates with the exhaust passage 222, and the pack body 200 is supplied with exhaust air that communicates 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 cell 100 facing the second side beam 202, an exhaust passage 222 is provided inside the second side beam 202, an intake port 221 is provided at each position on the second side beam 202 corresponding to the explosion-proof valve 103 of each single cell 100, the intake port 221 communicates with the exhaust passage 222, and the pack body 200 is provided with an exhaust hole that communicates with the exhaust passage 222.

[0080] In conventional technology, during the use of a single cell, if the internal pressure rises to a certain level, the explosion-proof valve opens, and flames, smoke, or gases inside the single cell are discharged through the explosion-proof valve and accumulate inside the power battery pack. If these are not discharged in a timely manner, they can cause secondary damage to the single cell. In the embodiment of the present invention, the first side beam 201 and / or the second side beam 202 are provided with an air intake port 221 corresponding to the explosion-proof valve 103 of the single cell 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 cell 100 rises, the explosion-proof valve 103 opens, and flames, smoke, or gases inside the single cell directly enter the exhaust passage 222 inside the first side beam 201 and / or the second side beam 202 through the air intake port 221 and are discharged from the first side beam 201 and / or the second side beam 202 through the exhaust port, for example, into the atmosphere through the exhaust port. In this way, the flames, smoke, or gases do not accumulate inside the pack body 200, and the flames, smoke, or gases do not cause secondary damage to the single cell 100.

[0081] Furthermore, in the multiple single cells 100, each single cell 100 has one end exhausted through the exhaust passage 222 in the first side beam 201 and the other end exhausted through the exhaust passage 222 in the second side beam 202. In this way, both ends of the single cell 100 are exhausted through different passages, increasing the exhaust distance and forming alternating exhaust, thereby lowering the temperature.

[0082] Hereinafter, with reference to the drawings, an electric vehicle 1 according to an embodiment of the present application will be described, which may include commercial vehicles, special-purpose vehicles, electric bicycles, electric motorcycles, electric scooters, and other electric vehicles that need to be driven by providing electrical energy using a power battery pack.

[0083] As shown in Figures 9 and 10, the electric vehicle 1 according to the embodiment of the present application includes the power battery pack 10 according to the above embodiment of the present application, and the pack body 200 may be integrally molded with the electric vehicle, or it may be a vehicle tray that houses and mounts single cells 100 and is manufactured independently.

[0084] The electric vehicle 1 according to the embodiment of the present invention can improve its driving range without increasing the battery's occupied space by utilizing the power battery pack 10 according to the above embodiment of the present invention.

[0085] In some specific embodiments of the present invention, as shown in Figures 9 and 10, 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 there is ample mounting space on the chassis of the electric vehicle 1, installing the power battery pack 10 on the chassis of the electric vehicle 1 allows for an increase in the number of individual cells 100, thereby improving the driving range of the electric vehicle 1.

[0086] In some specific examples of the present invention, as shown in Figures 9 and 10, the electric vehicle 1 includes one power battery pack 10 located at the bottom of the electric vehicle 1, the pack body 200 being fixedly connected to the chassis of the electric vehicle 1, the power battery pack 10 being arranged such that its width direction is along the width direction of the electric vehicle 1, i.e., the left-right direction of the electric vehicle 1 and its length direction is along the longitudinal direction of the electric vehicle 1, i.e., the front-rear direction of the electric vehicle 1, the single cells 100 being arranged such that their length direction is along the width direction of the power battery pack 10, and the plurality of single cells 100 being arranged along the longitudinal direction of the power battery pack 10 to form a battery array. In other embodiments, the electric vehicle 1 may include a plurality of power battery packs 10 located at the bottom of the electric vehicle 1, the shape and dimensions of the plurality of battery packs 10 may be the same or different, each power battery pack 10 may be adjusted according to the shape and dimensions of the chassis of the electric vehicle 1, and the plurality of power battery packs 10 being arranged along the longitudinal direction of the vehicle body, i.e., the front-rear direction.

[0087] In some specific examples of this 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%.

[0088] In some specific examples of the present invention, the single cell 100 includes a battery body 110 having a length L of 400 mm to 1500 mm.

[0089] In some embodiments of the present application, the electric vehicle 1 includes a single power battery pack 10 provided at the bottom of the electric vehicle, the power battery pack 10 being arranged such that its width direction is along the width direction of the body of the electric vehicle 1 and its length direction is along the longitudinal direction of the body of the electric vehicle 1, the single cell 100 being arranged such that its length direction is along the width direction of the power battery pack, the plurality of single cells 100 being arranged along the longitudinal direction of the power battery pack 10 to form a battery array, and the single cell 100 includes a battery body 110 having a length L of 400 mm to 1500 mm.

[0090] In some specific examples of the present invention, a single cell 100 includes a battery body 110, and the length L of the battery body 110 in the width direction of the power battery pack 10 and the width W of the vehicle body satisfy 46% ≤ L / W ≤ 76%. In the above embodiment, this can be achieved by providing only one pack body 200 along the width direction of the vehicle body, and in other possible embodiments, in some embodiments, the length L of the battery body 110 is 2000 mm to 2500 mm, provided that such dimensional requirements are met. Generally, for most vehicles, the width W of the vehicle body is 500mm to 2000mm, for example 500mm, 1600mm, 1800mm, 2000mm, and the length of the vehicle body is 500mm to 5200mm. For passenger cars, the width of the passenger car is generally 500mm to 1800mm, and the length of the vehicle body is 500mm to 5200mm, for example 2000mm, 2500mm, 3000mm, 3500mm, 4000mm, 4500mm, 4700mm, 5000mm, 5200mm. The length of the vehicle body may also be 500mm to 5000mm or 500mm to 4700mm.

[0091] According to some specific embodiments of the present application, the electric vehicle 1 includes a power battery pack 10 provided at the bottom of the electric vehicle 1, the power battery pack 10 is arranged such that its width direction is along the width direction of the body of the electric vehicle 1 and its length direction is along the longitudinal direction of the body of the electric vehicle 1, the single cells 100 are arranged such that their length direction is along the longitudinal direction of the power battery pack 10, and the plurality of single cells 100 are arranged along the width direction of the power battery pack 10 to form a battery array.

[0092] According to some specific embodiments of the present application, the electric vehicle 1 includes a power battery pack 10 provided at the bottom of the electric vehicle 1, the power battery pack 10 is arranged such that its width direction is along the width direction of the body of the electric vehicle 1 and its length direction is along the longitudinal direction of the body of the electric vehicle 1, the single cell 100 is arranged such that its length direction is along the longitudinal direction of the power battery pack 10, the plurality of single cells 100 are arranged along the width direction of the power battery pack 10 to form a battery array, and the single cell 100 includes a battery body 110 having a length L of 1500 mm to 2500 mm.

[0093] According to some specific embodiments of the present application, the electric vehicle 1 includes a power battery pack 10 provided at the bottom of the electric vehicle 1, the power battery pack 10 is arranged such that its width direction is along the width direction of the body of the electric vehicle 1 and its length direction is along the longitudinal direction of the body of the electric vehicle 1, the single cell 100 is arranged such that its length direction is along the longitudinal direction of the power battery pack 10, the plurality of single cells 100 are arranged along the width direction of the power battery pack 10 to form a battery array, and the single cell 100 includes a battery body 110 having a length L of 2000 mm to 2500 mm.

[0094] According to some specific examples of the present invention, a single cell 100 includes a battery body 110, and the length L of the battery body 110 in the longitudinal direction of the power battery pack 10 and the length X of the vehicle body satisfy 40% ≤ L / X ≤ 76%.

[0095] 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 battery pack case disclosed in Chinese Patent Document CN107925028A, and helps to accommodate a battery module 400 like the battery pack of CN107925028A, ensuring range and conforming to the dimensions of the vehicle body.

[0096] In some specific examples of this application, a single 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 embodiment, this can be achieved by providing only one single cell 100 along the width direction of the vehicle body. In other possible embodiments, this can be achieved by providing multiple battery modules 400 or multiple single cells 100 in the longitudinal direction, provided that such dimensional requirements are met. In some embodiments, the length L of the battery body 110 is 400 mm to 1500 mm.

[0097] Other configurations and operations of the single cell 100, the power battery pack 10, and the electric vehicle 1 according to the embodiment of this application are known to those skilled in the art and will not be described in detail here.

[0098] Based on the above, compared to conventional technology, this invention allows for a longer design of the single cell dimensions, up to a maximum of 2500 mm, and by applying this single cell to a battery pack, the following technical effects can be achieved.

[0099] 1. Significant improvement in battery pack volume utilization and volumetric energy density: Currently, the industry volume utilization rate is around 40%, but with the design of this invention, batteries can be placed throughout the entire interior of the battery pack, improving the volume utilization rate to over 60%, and even up to 80%, and improving the volumetric energy density by over 20%. If a similar vehicle adopts the battery and arrangement method according to the present invention, the energy can be improved by 20% to 30%, and the vehicle's driving range can also be improved by 20% to 30%.

[0100] 2. Significant reduction in battery pack costs: Because the individual cells themselves provide mechanical reinforcement, the reinforcing ribs of the battery tray can be omitted or reduced, simplifying the battery pack manufacturing process and reducing manufacturing costs. Furthermore, the dimensions of the individual cells according to this application match the dimensions of the battery pack, allowing the individual cells to be directly arranged in the battery pack. Unlike the prior art, where multiple individual cells are first arranged in a module frame enclosed by two end plates and two side plates, and then the battery module is assembled into the battery pack, the dimensions of the individual cells according to this application are sufficiently long, allowing multiple individual cells to be directly arranged in the battery pack. This eliminates or reduces the need for end plates, side plates, and a large number of fasteners such as screws used to assemble and attach the battery module, making the individual cell assembly process simpler, reducing manufacturing costs such as labor and materials, and further facilitating the widespread adoption of electric vehicles.

[0101] 3. Improved battery pack stability and reliability: The more complex the battery pack assembly process, the higher the probability of defective products, the greater the possibility of the battery pack becoming loose or not securely attached, negatively impacting the quality of the battery pack and reducing its stability and reliability. Assembling the single cell according to this application into a battery pack simplifies the assembly process, thereby improving the stability and reliability of the battery pack and reducing the battery pack defect rate.

[0102] 4. Significant improvement in battery pack heat dissipation safety: The rise in temperature of a battery pack is the result of both heat generation and heat dissipation. Assuming the same capacity, the amount of heat generated by a single cell is constant. In this invention, by designing the single cell to be elongated, the heat dissipation effect of the single cell is higher, and the temperature rise of the single cell decreases. Assuming that the operating conditions of the battery pack are constant, adopting this single cell reduces the temperature rise of the battery pack, thus significantly improving the safety of the battery pack.

[0103] Based on the significant technical benefits of the longer cell length described above, improvements in aspects such as the molding process and structural design can enhance the support strength of the case and control the aspect ratio of the case within a predetermined range, thereby ensuring the cell's own support. Furthermore, optimization of the current collection path can reduce the internal resistance of the cell. Additionally, improvements in the electrolyte injection process can solve the problem of increased electrolyte injection time caused by the longer dimensions of the cell.

[0104] The following explanation will be given with reference to Comparative Example 1 and Examples 1-2, Comparative Example 2 and Examples 3-4, and Comparative Example 3 and Examples 5-6. The power battery pack 10 according to the embodiment of the present application is improved in terms of energy density and other aspects by designing the arrangement and dimensional parameters of the single cells 100.

[0105] In the following examples and comparative examples, a lithium iron phosphate battery with a power capacity of 73 kWh is used as an example.

[0106] In Comparative Example 1, Example 1, and Example 2, the battery pack has a total volume of 213L, the combined volume of the pack body, internal battery management system, and other power distribution modules is 58L, the actual volume remaining in the battery pack that can accommodate the single cells, crossbeam, and sidebeam is 155L, the volume of the power distribution box is 22.5L, and the pack body has a length of 1380mm, a width of 1005mm, and a thickness of 137mm. The total volume of the battery pack is 213L = 1380 × 1005 × 137 × 0.000001 + 22.5. The power battery pack is positioned so that its width aligns with the width direction of the vehicle body and its length aligns with the length direction of the vehicle body. The width of the vehicle body is 1880mm.

[0107] Comparative Example 1 In the conventional power battery pack 10', as shown in Figure 1, two cross beams 500' and one side beam 600' are provided within the pack body 200'', and the two cross beams 500' and one side beam 600' divide the single cell into six battery packs 400', each of which has side plates and end plates.

[0108] Example 1 In the power battery pack 10 according to the embodiment of the present application, as shown in Figure 13, the single cells 100 are arranged so that their longitudinal direction is along the width direction B of the power battery pack, and a plurality of single cells 100 are arranged along the longitudinal direction A of the power battery pack 10, and the pack body 200 houses one single cell 100 in the width direction B of the power battery pack, and the single 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 cross beam 500 is provided within the pack body 200, and no side beams 600 are provided, the cross beam 500 extends along the width direction B of the power battery pack 10, and the plurality of single cells 100 are arranged along the longitudinal direction A of the power battery pack 10 to form a battery array, and the cross beam 500 divides the battery array into two parts along the longitudinal direction A of the power battery pack 10. The first side beams 201 and 202 of the pack body 200, located on both sides in the width direction B of the power battery pack 10, provide support to the individual cells 100, while the first end beams 203 and 204 of the pack body 200, located at both ends in the longitudinal direction A of the power battery pack 10, provide inward pressing force to adjacent individual cells 100. Within the pack body 200 is a single layer of battery array along the height direction C of the power battery pack 10. The battery array (also understood as a battery module) of the power battery pack 10 is not provided with end plates or side plates.

[0109] Example 2 In the power battery pack 10 according to the embodiment of the present application, as shown in Figure 14, the single cells 100 are arranged such that their longitudinal direction aligns with the width direction B of the power battery pack, and a plurality of single cells 100 are arranged along the longitudinal direction A of the power battery pack 10. The pack body 200 houses one single cell 100 in the width direction B of the power battery pack, and the single 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. Cross beams 500 and side beams 600 are not provided within the pack body 200. The first side beams 201 and second side beams 202 of the pack body 200 located on both sides in the width direction B of the power battery pack 10 provide support force to the single cells 100, and the first end beams 203 and second end beams 204 of the pack body 200 located at both ends in the longitudinal direction A of the power battery pack 10 provide inward pressing force to adjacent single cells 100. The pack body 200 contains a single layer of battery arrays along the height direction C of the power battery pack 10. The battery arrays (also understood as battery modules) of the power battery pack 10 do not have end plates or side plates.

[0110] As those skilled in the art will see by comparing Comparative Example 1 with Examples 1 to 3, the power battery pack 10 according to the embodiment of the present application achieves a higher energy density compared to the power battery pack 10' of the prior art by overcoming the limitations of conventional power battery packs in terms of space utilization through the design of the arrangement of the single cells 100, dimensional parameters, and other factors.

[0111] In Comparative Example 2, Example 3, and Example 4, the battery pack has a total volume of 283L, with the combined volume of the pack body, internal battery management system, and other power distribution modules being 89L, and the actual remaining volume of the battery pack that can accommodate the single cells and / or crossbeams and sidebeams being 221L. The pack body has a length of 1380mm, a width of 1380mm, and a thickness of 137mm, and the volume of the power distribution box is 11L, resulting in a total volume of 310L = 1580 × 1380 × 137 × 0.000001 + 11. The power battery pack is positioned so that its width aligns with the width direction of the vehicle body and its length aligns with the length direction of the vehicle body. The width of the vehicle body is 1950mm.

[0112] Comparative Example 2 In the conventional power battery pack 10', as shown in Figure 1, two cross beams 500' and one side beam 600' are provided within the pack body 200'', and the two cross beams 500' and one side beam 600' divide the single cell into six battery modules 400', and each battery module 400' has side plates and end plates.

[0113] Example 3 In the power battery pack 10 according to the embodiment of the present application, as shown in Figure 15, the single cells 100 are arranged so that their longitudinal direction is along the longitudinal direction A of the power battery pack, and a plurality of single cells 100 are arranged along the width direction B of the power battery pack 10, and the pack body 200 houses one single cell 100 in the longitudinal direction A of the power battery pack, and the single cell 100 extends from one side to the other of the pack body 200 in the longitudinal direction A of the power battery pack 10. One side beam 600 is provided within the pack body 200, and no cross beam 500 is provided, the side beam 600 extends along the longitudinal direction A of the power battery pack 10, and the plurality of single cells 100 are arranged along the width direction B of the power battery pack 10 to form a battery array, and the side beam 600 divides the battery array into two parts along the width direction B of the power battery pack 10. The first end beams 203 and second end beams 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 individual cells 100, while the first side beams 201 and second side beams 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 adjacent individual cells 100. Within the pack body 200 is a single layer of battery array along the height direction C of the power battery pack 10. The battery array (also understood as a battery module) of the power battery pack 10 is not provided with end plates or side plates.

[0114] Example 4 In the power battery pack 10 according to the embodiment of the present application, as shown in Figure 16, the single cells 100 are arranged such that their longitudinal direction is along the longitudinal direction A of the power battery pack, and a plurality of single cells 100 are arranged along the width direction B of the power battery pack 10. The pack body 200 houses one single cell 100 in the longitudinal direction A of the power battery pack, and the single cell 100 extends from one side to the other of the pack body 200 in the longitudinal direction A of the power battery pack 10. Cross beams 500 and side beams 600 are not provided within the pack body 200. The first end beams 203 and second end beams 204 of the pack body 200 located at both ends in the longitudinal direction A of the power battery pack 10 provide support force to the single cells 100, and the first side beams 201 and second side beams 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 adjacent single cells 100. The pack body 200 contains a single layer of battery arrays along the height direction C of the power battery pack 10. The battery arrays (also understood as battery modules) of the power battery pack 10 do not have end plates or side plates.

[0115] In Comparative Example 3, Example 5, and Example 6, the battery pack has a total volume of 414L, with the combined volume of the pack body, internal battery management system, and other power distribution modules being 58L, and the actual remaining volume of the battery pack that can accommodate the single cells and / or crossbeams and sidebeams being 356L. The pack body has a length of 2130mm, a width of 1380mm, and a thickness of 137mm, and the volume of the power distribution box is 11L, so the total volume of the battery pack is 414L = 2130 × 1380 × 137 × 0.000001 + 11. The power battery pack is positioned so that its width aligns with the width direction of the vehicle body and its length aligns with the length direction of the vehicle body. The length of the vehicle body is 4700mm.

[0116] Comparative Example 3 In this embodiment, the arrangement of the single cell 100 in the battery pack 10 is the same as the arrangement in Comparative Example 1.

[0117] Example 5 In this embodiment, the arrangement of the single cell 100 in the battery pack 10 is the same as the arrangement in Embodiment 5.

[0118] Example 6 In this embodiment, the power battery pack 10 has a total volume of 508L, the sum of the volume occupied by the pack body 200, the internal battery management system and other power distribution modules is 119L, and the actual remaining volume of the power battery pack 10 that can accommodate the individual cells and / or crossbeams and sidebeams is 389L. The length of the vehicle body is 5200mm, the pack body 200'' has a length of 2630mm, a width of 1380mm and a thickness of 137mm, and the individual cells have a length of 2500mm, a width of 118mm and a height of 13.5mm. The power battery pack is arranged so that its width direction is aligned with the width direction of the vehicle body and its length direction is aligned with the length direction of the vehicle body. The length of the vehicle body is 5200mm. In this embodiment, the arrangement method of the individual cells in the battery pack is the same as the arrangement method in Embodiment 5.

[0119] Table 1 shows the specific parameters for Examples 1-7 and Comparative Examples 1-3.

[0120] [Table 1]

[0121] As those skilled in the art will see by comparing Comparative Example 1 with Examples 1-2, the power battery pack 10 according to the embodiment of the present application achieves a higher energy density by fully utilizing the space in the vehicle body in the direction of cell extension, through the design of the arrangement of the individual cells 100, dimensional parameters, and other factors, such as the ratio of the length of the individual cell to the width of the vehicle body or the ratio of the length of the individual cell to the length of the vehicle body.

[0122] As those skilled in the art will see by comparing Comparative Example 2 with Examples 3-4, the power battery pack 10 according to the embodiment of the present application achieves a higher energy density through the design of the arrangement of the individual cells 100, dimensional parameters, and other factors, such as the ratio of the length of the individual cell to the width of the vehicle body or the ratio of the length of the individual cell to the length of the vehicle body. Furthermore, this improvement in energy density is amplified with increasing total volume of the power battery pack; that is, the larger the volume of the power battery pack, the more pronounced the energy density improvement effect of the technical means of the embodiment of the present application becomes.

[0123] As a person skilled in the art can see by comparing Comparative Example 3 with Examples 5-6, the power battery pack 10 according to the embodiment of the present application can fully utilize the space in the vehicle body in the direction of cell extension due to the arrangement of the individual cells 100, dimensional parameters, and other factors, such as the ratio of the length of the individual cells to the width of the vehicle body or the ratio of the length of the individual cells to the length of the vehicle body. When the dimensions of the vehicle body are constant, a higher energy density can be achieved in the present application.

[0124] In this specification, any reference to the terms "specific examples," "specific examples," etc., means that the specific features, structures, materials, or properties described in combination with such examples are included in at least one example of this application. In this specification, the exemplary expressions of the above terms are not necessarily limited to the same examples.

[0125] Although embodiments of this application have been illustrated and described, as will be understood by those skilled in the art, various changes, modifications, substitutions, and alterations can be made to these embodiments without departing from the principles and spirit of this application, and the scope of this application is limited to the claims and their equivalent scope.

Claims

1. A power battery pack that supplies power to an electric vehicle, The pack itself, The pack includes a plurality of single batteries provided inside the pack body, The aforementioned single cell has a length L0, a width H0, and a thickness D0, where L0 > H0 ≥ D0. When the power battery pack is installed in the electric vehicle, the individual cells extend so that their longitudinal direction is aligned with the width or longitudinal direction of the electric vehicle. When the longitudinal direction of a single cell extends along the width direction of the electric vehicle, the length L0 of the single cell and the dimension W in the width direction of the electric vehicle body satisfy 46% ≤ L0 / W ≤ 76%, or, A power battery pack characterized in that, when the longitudinal direction of a single cell extends along the longitudinal direction of an electric vehicle, the length L0 of the single cell and the dimension X in the longitudinal direction of the body of the electric vehicle satisfy 40% ≤ L0 / X ≤ 76%.

2. The power battery pack according to claim 1, characterized in that the sum of the volumes V1 of the plurality of single cells and the volume V2 of the power battery pack satisfy V1 / V2 ≥ 55%.

3. The power battery pack according to claim 2, characterized in that V1 / V2 ≥ 60%.

4. The single cell is arranged such that its longitudinal direction aligns with the width direction of the power battery pack, and the plurality of single cells are arranged along the longitudinal direction of the power battery pack. The power battery pack according to claim 1, characterized in that the pack body houses only one of the single cells in the width direction of the power battery pack.

5. The single cell is arranged such that its longitudinal direction aligns with the width direction of the power battery pack, and the plurality of single cells are arranged along the longitudinal direction of the power battery pack. The power battery pack according to claim 1, characterized in that, in the width direction of the power battery pack, the nearest distance between one end of the single cell and the adjacent side beam of the pack body is L1, the nearest distance between the other end of the single cell and the adjacent side beam of the pack body is L2, and the length L0 of the single cell satisfies L1 + L2 < L0.

6. The single cell is arranged such that its longitudinal direction aligns with the width direction of the power battery pack, and the plurality of single cells are arranged along the longitudinal direction of the power battery pack. The power battery pack according to claim 1, characterized in that the single cell extends along the width direction of the power battery pack from one side to the other side of the pack body.

7. The power battery pack according to any one of claims 4 to 6, characterized in that the pack body is provided with at least one cross beam extending along the width direction of the power battery pack, the plurality of single cells are arranged along the longitudinal direction of the power battery pack to form a battery array, the cross beam divides the battery array into at least two parts along the longitudinal direction of the power battery pack, and each part of the battery array includes at least one single cell.

8. The power battery pack according to claim 1, characterized in that the single cell is arranged such that its longitudinal direction is aligned with the width direction of the power battery pack, the plurality of single cells are arranged along the longitudinal direction of the power battery pack to form a battery array, at least two rows of battery arrays are arranged within the pack body along the width direction of the power battery pack, each row of battery arrays includes a plurality of single cells arranged along the longitudinal direction of the power battery pack, and at least one longitudinal beam is provided within the pack body extending along the longitudinal direction of the power battery pack, the longitudinal beam is located between two adjacent rows of battery arrays.

9. The pack body includes side beams located on both sides in the width direction of the power battery pack, and both ends of the single cell in the longitudinal direction are supported by the side beams. The power battery pack according to any one of claims 4 to 6 and 8, wherein the pack body includes end beams located at both ends in the longitudinal direction of the power battery pack, and the end beams provide an inward pressing force to adjacent single cells.

10. The power battery pack according to claim 1, characterized in that the single cell is arranged such that its longitudinal direction is aligned with the width direction of the power battery pack, the plurality of single cells are arranged along the longitudinal direction of the power battery pack to form a battery array, and the pack body contains at least two layers of battery arrays along the height direction of the power battery pack.

11. The single cell is arranged so that its longitudinal direction aligns with the longitudinal direction of the power battery pack, and the plurality of single cells are arranged along the width direction of the power battery pack. The power battery pack according to claim 1, characterized in that the pack body houses only one of the single cells in the longitudinal direction of the power battery pack.

12. The single cell is arranged so that its longitudinal direction aligns with the longitudinal direction of the power battery pack, and the plurality of single cells are arranged along the width direction of the power battery pack. The power battery pack according to claim 1, characterized in that, in the longitudinal direction of the power battery pack, the nearest-neighbor distance between one end of the single cell and the adjacent end beam of the pack body is L3, the nearest-neighbor distance between the other end of the single cell and the adjacent end beam of the pack body is L4, and the length L0 of the single cell satisfies L3 + L4 < L0.

13. The single cell is arranged such that its longitudinal direction aligns with the longitudinal direction of the power battery pack, and the plurality of single cells are arranged along the width direction of the power battery pack, and the single cell is The power battery pack according to claim 1, characterized in that it extends along the longitudinal direction of the power battery pack from one end to the other end of the pack body.

14. The power battery pack according to any one of claims 11 to 13, characterized in that the pack body is provided with at least one longitudinal beam extending along the longitudinal direction of the power battery pack, the plurality of single cells are arranged along the width direction of the power battery pack to form a battery array, the longitudinal beam divides the battery array into at least two parts along the width direction of the power battery, and each part of the battery array includes at least one single cell.

15. The power battery pack according to claim 1, characterized in that the single cell is arranged such that its longitudinal direction aligns with the longitudinal direction of the power battery pack, the plurality of single cells are arranged along the width direction of the power battery pack to form a battery array, at least two rows of battery arrays are arranged within the pack body along the longitudinal direction of the power battery pack, each row of battery arrays includes a plurality of single cells arranged along the width direction of the power battery pack, and at least one cross beam is provided within the pack body extending along the width direction of the power battery pack, the cross beam is located between two adjacent rows of battery arrays.

16. The pack body includes end beams located at both ends in the longitudinal direction of the power battery pack, and both ends in the longitudinal direction of the single cell are supported by the end beams. The power battery pack according to any one of claims 11 to 13 and 15, wherein the pack body includes side beams located on both sides in the width direction of the power battery pack, and the side beams provide an inward pressing force to adjacent single cells.

17. The power battery pack according to any one of claims 11 to 13 and 15, characterized in that the single cell is arranged so that its longitudinal direction is along the longitudinal direction of the power battery pack, the plurality of single cells are arranged along the width direction of the power battery pack to form a battery array, 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, 4 to 6, 8, 11 to 13 and 15, characterized in that the pack body includes a vehicle tray that is engaged and connected to the vehicle body.

19. The power battery pack according to any one of claims 1, 4 to 6, 8, 11 to 13, and 15, characterized in that the width F of the pack body in the width direction of the power battery pack is 500 mm to 1500 mm.

20. A power battery pack according to any one of claims 1, 4 to 6, 8, 11 to 13 and 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, 4 to 6, 8, 11 to 13 and 15, characterized in that the pack body is formed in an electric vehicle.

22. The aforementioned power battery pack is arranged such that its width is aligned with the width direction of the electric vehicle's body and its length is aligned with the longitudinal direction of the electric vehicle's body, or The power battery pack according to any one of claims 1, 4 to 6, 8, 11 to 13, and 15, characterized in that the power battery pack is arranged such 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 power battery pack according to any one of claims 1, 4-6, 8, 11-13, and 15, characterized in that the single cell includes a battery body, the battery body has a length L, a width H, and a thickness D, the length L of the battery body is greater than the width H, the width H of the battery body is greater than the thickness D, and the length L and width H of the battery body satisfy L / H = 4 to 21.

24. The power battery pack according to any one of claims 1, 4 to 6, 8, 11 to 13, and 15, characterized in that the single cell 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 power battery pack according to any one of claims 1, 4 to 6, 8, 11 to 13, and 15, characterized in that the single cell includes a battery body, and the length L of the battery body and the volume V of the battery body satisfy L / V = 0.00045 mm⁻² to 0.0015 mm⁻².

26. The power battery pack according to any one of claims 1, 4 to 6, 8, 11 to 13, and 15, characterized in that the single cell includes a battery body, and the width H of the battery body and the volume V of the battery body satisfy H / V = 0.0001 mm⁻² to 0.00015 mm⁻².

27. The power battery pack according to any one of claims 1, 4 to 6, 8, 11 to 13, and 15, characterized in that the single cell includes a battery body, and the thickness D of the battery body and the volume V of the battery body satisfy D / V = 0.0000065 mm⁻² to 0.00002 mm⁻².

28. The power battery pack according to any one of claims 1, 4 to 6, 8, 11 to 13, and 15, characterized in that the single cell includes a battery body, and the length L of the battery body and the surface area S of the battery body satisfy L / S = 0.002 mm⁻¹ to 0.005 mm⁻¹.

29. The power battery pack according to any one of claims 1, 4 to 6, 8, 11 to 13, and 15, characterized in that the single cell includes a battery body, and the surface area S of the battery body and the volume V of the battery body satisfy S / V = 0.1 mm⁻¹ to 0.35 mm⁻¹.

30. The power battery pack according to any one of claims 1, 4 to 6, 8, 11 to 13, and 15, characterized in that the single cell includes a battery body, and the length L of the battery body is 400 mm to 2500 mm.

31. The power battery pack according to any one of claims 1, 4 to 6, 8, 11 to 13 and 15, characterized in that the single cell is an aluminum case rectangular battery, and includes a battery body and an explosion-proof valve, wherein the explosion-proof valve is provided at least one end of the battery body in the longitudinal direction.

32. The power battery pack according to any one of claims 1, 4 to 6, 8, 11 to 13 and 15, characterized in that the single cell includes a battery body, and explosion-proof valves are provided at both ends of the battery body in the longitudinal direction.

33. An electric vehicle characterized by including a power battery pack according to any one of claims 1 to 32.

34. The electric vehicle according to claim 33, characterized in that the power battery pack is provided at the bottom of the electric vehicle, and the pack body is fixedly connected to the chassis of the electric vehicle.

35. The electric vehicle according to claim 34, wherein the electric vehicle includes one power battery pack provided at the bottom of the electric vehicle, the power battery pack is arranged such that its width direction is along the width direction of the body of the electric vehicle and its length direction is along the length direction of the body of the electric vehicle, and the single cell is arranged such that its length direction is along the width direction of the power battery pack.

36. The electric vehicle according to claim 35, characterized in that the width F of the pack body and the width W of the vehicle body satisfy 50% ≤ F / W ≤ 80%.

37. The electric vehicle according to claim 35, characterized in that the single cell includes a battery body having a length L of 400 mm to 1500 mm.

38. The electric vehicle according to claim 35, wherein the single cell includes a battery body, and the length L of the battery body and the width W of the vehicle body in the width direction of the power battery pack satisfy 46% ≤ L / W ≤ 76%.

39. The electric vehicle according to claim 35, characterized in that the width W of the vehicle body is 500 mm to 2000 mm.

40. The electric vehicle according to claim 34, wherein the electric vehicle includes one power battery pack provided at the bottom of the electric vehicle, the power battery pack is arranged such that its width direction is along the width direction of the body of the electric vehicle and its length direction is along the length direction of the body of the electric vehicle, and the single cell is arranged such that its length direction is along the length direction of the power battery pack.

41. The electric vehicle according to claim 40, characterized in that the single cell includes a battery body having a length L of 1500 mm to 2500 mm.

42. The electric vehicle according to claim 41, characterized in that the length L of the battery body is 2000 mm to 2500 mm.

43. The electric vehicle according to claim 40, wherein the single cell includes a battery body, and the length L of the battery body in the longitudinal direction of the power battery pack and the length X of the electric vehicle body satisfy 40% ≤ L / X ≤ 76%.

44. The electric vehicle according to claim 40, characterized in that the length X of the vehicle body is 500 mm to 5200 mm.

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