Battery pack and electric vehicle

Abstract

To provide a battery pack having advantages such as a high space utilization factor, high energy density, high cruising capability, high reliability, low cost, and high quality.SOLUTION: The present disclosure relates to a battery pack and an electric vehicle. The battery pack includes: a pack body; and a plurality of battery cells provided in the pack body. A sum V1 of a volume of the plurality of battery cells and a volume V2 of the battery pack satisfy V1 / V2≥55%. The battery pack has a first direction and a second direction that are perpendicular to each other. The battery cell is arranged such that a longitudinal direction thereof aligns with the first direction of the battery pack. The plurality of battery cells are arranged along the second direction of the battery pack. The battery cell includes a battery body having a length of 400 to 2500 mm.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] The present application relates to the technical field of batteries, and in particular to a battery pack and an electric vehicle having the battery pack. [Background technology]

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

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

[0005] In related prior art, as shown in FIG. 1 , a pack body 200″ of a battery pack 10′ is often divided into mounting regions for multiple battery modules 400′ by transverse cross beams 500′ and longitudinal cross beams 600′. For example, the battery modules 400′ of the assembled battery disclosed in CN107925028A are fixed to the transverse cross beams 500′ or longitudinal cross beams 600′ with screws or the like. The battery modules 400′ include multiple cells arranged in sequence to form a battery array. End beams and / or side beams are provided outside the battery array. Typically, both end beams and side beams are included, and the end beams and side beams are fixed together to enclose the space housing the battery array. Furthermore, the end beams and side beams may be connected by screws or other connecting members such as tie rods to secure the battery array.

[0006] The applicant has found through testing and analysis that because the battery modules 400' are fixed to the transverse cross beams 500' or the longitudinal cross beams 600' using structures such as screws, space is wasted, and the increased number of connecting members such as screws increases weight and reduces energy density. Furthermore, because the battery modules 400' are designed using a combination of end beams and side beams, each of which has a certain thickness and height, space within the pack body 200'' is wasted, resulting in a low volume utilization rate of the pack body 200". In general, in the battery pack 10' of the above-mentioned prior art, the ratio of the sum of the volumes of the cells in the pack body 200'' to the volume of the pack body 200'' is about 50%, and can even be as low as 40%.

[0007] In the battery pack 10′ according to the above-mentioned prior art, the end beams, side beams, and internal connection and installation method of the battery module 400′ employed therein all reduce the utilization rate of the internal space of the battery pack body 200″. As a result, the ratio of the sum of the volume of the cells in the battery pack 10′ to the volume of the battery pack body 200″ is too low, and the energy density does not meet the user demand for the driving range of electric vehicles, which has become a significant factor restricting the development of electric vehicles. Furthermore, the battery pack 10′ has a complicated assembly process, which requires first assembling the battery modules and then installing the battery modules into the battery pack body, thereby increasing labor and material costs. Furthermore, the need for multiple assembly processes increases the probability of defective products during the battery pack assembly process. Multiple assembly processes increase the possibility of loosening the battery pack and making the installation weak, which adversely affects the quality of the battery pack and reduces the stability and reliability of the battery pack.

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

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

[0010] A battery pack according to an embodiment of the first aspect of the present application includes a pack body and a plurality of unit cells provided within the pack body, wherein the sum V1 of the volumes of the plurality of unit cells and the volume V2 of the battery pack satisfy V1 / V2≧55%, the battery pack has a first direction and a second direction that are perpendicular to each other, the unit cells are arranged such that their longitudinal direction is along the first direction of the battery pack, and the plurality of unit cells are arranged along the second direction of the battery pack, the pack body accommodates only one unit cell along the first direction, and the unit cell includes a battery body having a length of 600 to 2500 mm.

[0011] The power battery according to the embodiment of the present application improves the space utilization rate of the battery pack by limiting the ratio of the sum of the cell volumes to the battery pack volume, i.e., V1 / V2 ≥ 55%, and by arranging more cells in the battery pack, i.e., arranging more energy supply structures in a unit space, the energy density can be improved, thereby improving the driving range without increasing the occupied space, while reducing the cost of assembling the battery pack and improving the quality and reliability of the battery pack.

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

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

[0014] An energy storage device according to an embodiment of the third aspect of the present application includes the battery pack according to the embodiment of the first aspect of the present application.

[0015] Additional aspects and advantages of the present application will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the present application. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is an exploded view of a battery pack according to the prior art. [Figure 2] 1 is a cross-sectional view of a battery pack according to an embodiment of the present application. [Figure 3] 1 is a perspective view of a battery pack according to an embodiment of the present application; [Figure 4] FIG. 1 is an exploded view of a battery pack according to an embodiment of the present application. [Figure 5] FIG. 1 is a schematic diagram illustrating the configuration of a cell according to an embodiment of the present invention. [Figure 6] 1 is a schematic diagram illustrating an arrangement of battery modules in a battery pack according to an embodiment of the present application. [Figure 7] FIG. 10 is a schematic diagram illustrating an arrangement of battery modules in a battery pack according to another embodiment of the present application. [Figure 8] 1 is a schematic diagram illustrating a configuration in which a pack body of a battery pack according to an embodiment of the present application is formed in an electric vehicle. [Figure 9] 1 is a schematic diagram of an electric vehicle according to an embodiment of the present invention; [Figure 10] 1 is an exploded view of an electric vehicle according to an embodiment of the present application. [Figure 11] FIG. 3 is an enlarged view of region G in FIG. 2. [Figure 12] FIG. 1 is a perspective view of a battery pack according to a first alternative embodiment of the present application. [Figure 13] FIG. 10 is a perspective view of a battery pack according to a second alternative embodiment of the present application. [Figure 14] FIG. 10 is a perspective view of a battery pack according to a third alternative embodiment of the present application. [Figure 15] FIG. 10 is a perspective view of a battery pack according to a fourth alternative embodiment of the present application. [Figure 16] FIG. 10 is a perspective view of a battery pack according to a fifth alternative embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, the embodiments of the present application will be described in detail, and examples of the embodiments are shown in the drawings, and the same or similar reference numerals throughout indicate the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the drawings are merely illustrative and are intended to interpret the present application, but should not be understood as limiting the present application.

[0018] In addition, in the description of this application, the orientations or positional relationships indicated by terms such as "vertical direction," "horizontal direction," "length," "width," "thickness," "inside," and "outside" are based on the orientations or positional relationships shown in the drawings, and are intended merely to facilitate and simplify the description of this application. They do not indicate or suggest that the devices or components shown must have a specific orientation and be configured and operate in a specific orientation, and therefore should not be understood as limiting this application.

[0019] Also, in the description of this application, "plurality" means two or more.

[0020] Considering the current state of the art battery packs, the present application provides a battery pack and an electric vehicle having the same, which have advantages such as high space utilization rate, high energy density, and long driving range.

[0021] A battery pack 10 according to an embodiment of the present invention will be described below with reference to the drawings.

[0022] As shown in FIGS. 2 to 16, a battery pack 10 according to an embodiment of the present invention includes a pack body 200 and a plurality of unit cells 100. The unit cells 100 are made of a polysilicon.

[0023] The plurality of cells 100 are arranged in a pack body 200, and the pack body 200 can be understood as a case that houses the plurality of cells 100, and may include, for example, a tray 210 and an upper cover 220, which together define a space for housing the plurality of cells 100, and the plurality of cells 100 are arranged in the tray 210 and covered by the upper cover 220. The sum V1 of the volumes of the plurality of cells 100 and the volume V2 of the battery pack 10 satisfy V1 / V2≧55%.

[0024] As will be understood by those skilled in the art, V1 is the product of the volume of each cell 100 and the number of cells 100, i.e., V1 is the total volume of the cells 100, and V2 is the total volume of the three-dimensional shape defined by the outer casing of the battery pack 10.

[0025] According to the battery pack 10 of the present application, the ratio of the sum of the volumes V1 of the cells 100 to the volume V2 of the battery pack 10, i.e., V1 / V2 ≥ 55%, can be limited to improve the space utilization rate of the battery pack 10. By arranging more cells 100 in the battery pack 10, i.e., arranging more energy supply structures in a unit space, the energy density can be improved, and the driving range can be improved without increasing the occupied space. At the same time, costs can be reduced during the battery pack assembly process, and the quality and reliability of the battery pack can be improved. In the battery pack of the present application, the pack body accommodates only one cell along the first direction, and the cell includes a battery body having a length of 600-2500 mm, and is arranged along the first direction within the battery pack and aligned along the second direction. The cells are aligned and aligned within the battery pack to form a battery pack with a volume utilization rate of 55% or more, thereby improving the space utilization rate, the energy density, and the driving range of an electric vehicle using the battery pack.

[0026] In some specific embodiments of the present application, the ratio of the sum V1 of the volumes of the cells 100 to the volume V2 of the battery pack 10 satisfies V1 / V2≧60%.

[0027] In another specific embodiment of the present application, the ratio of the sum V1 of the volumes of the cells 100 to the volume V2 of the battery pack 10 satisfies V1 / V2≧62%.

[0028] In another specific embodiment of the present application, the ratio of the sum V1 of the volumes of the cells 100 to the volume V2 of the battery pack 10 satisfies V1 / V2≧65%.

[0029] As can be understood, V2 is the total volume of the three-dimensional shape defined by the outer casing of the battery pack 10, i.e., the volume including the internal space of the battery pack 10, i.e., the volume of the three-dimensional area spatially enclosed by the outer casing of the battery pack 10. In an electric vehicle, V1 / V2 can be understood as the space utilization ratio.

[0030] As can be understood by those skilled in the art, due to the influence of several factors, for example, the peripheral components occupy the internal space of the pack body 200, including the anti-collision space at the bottom of the tray, the liquid cooling system, the heat preservation material, the insulating protection material, the thermal safety auxiliary components, the fire exhaust passage, the high-voltage power distribution module, etc., the peak value of V1 / V2 is generally 80%, i.e., V1 / V2≦80%.

[0031] Below, with reference to the drawings, we will explain a battery pack 10 according to a specific embodiment of the present application, and the longitudinal direction of the 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.

[0032] In some specific embodiments of the present application, as shown in FIGS. 2 to 4 , the cell 100 is arranged such that its longitudinal direction is along the width direction B of the battery pack 10, and multiple cells 100 are arranged along the longitudinal direction A of the battery pack 10, which helps V1 / V2 of the battery pack 10 to reach 55%, 60%, 62%, 65% or more, and at the same time, the space utilization rate of the battery pack 10 is generally set to 85% or less in order to reserve enough space for installing other electronic components (e.g., a battery management system BMS).

[0033] In some specific examples of the present application, as shown in FIGS. 3 and 4, in the width direction B of the battery pack 10, the distance between the single cell 100 and the side wall of the pack body 200 is smaller than the length of the single cell 100. Specifically, in the width direction B of the battery pack 10, the closest distance between one end of the single cell 100 and the side beam of the pack body 200 adjacent to it (the above-mentioned one end of the single cell 100) is L1, and the closest distance between the other end of the single cell 100 and the side beam of the pack body 200 adjacent to it (the above-mentioned other end of the single cell 100) is L2. The length L of the single cell 100 satisfies L1 + L2 < L. Thus, in the width direction B of the battery pack 10, another additional single cell 100 cannot be accommodated.

[0034] In other words, the pack body 200 accommodates only one single cell 100 in the width direction B of the battery pack 10. That is, in the width direction B of the battery pack 10, the single cells 100 cannot be arranged in two or more numbers in this direction. In the battery pack 10, when at least two layers of single cells 100 are provided along the height direction C of the battery pack 10, at least one layer of single cells 100 can be accommodated only one by one in the width direction B of the battery pack 10. Accommodating only one single cell 100 means that only one single cell 100 can be provided in parallel in the width direction B of the battery pack 10, and two layers can be provided in the height direction C of the battery pack 10, rather than arranging one or more single cells 100 in the width direction B of the battery pack 10.

[0035] As can be understood, on both sides of the pack body 200 in the width direction B of the battery pack 10 are side beams, and at both ends of the pack body 200 in the longitudinal direction A of the battery pack 10 are end beams.

[0036] 3 and 4 , in some specific examples of the present application, the length of the cells 100 extends across the entire width direction B of the battery pack 10, i.e., the cells 100 extend from one side to the other of the pack body 200 along the width direction B of the battery pack 10, and the length of the cells 100 is filled in the width direction B of the battery pack 10. Two or more cells 100 cannot be arranged in the width direction B of the pack body 200, and both ends of the cells 100 in the longitudinal direction are fitted into both side walls of the pack body 200 facing in the width direction B, and can be fixed to the pack body 200, for example. This eliminates the need for width-direction cross beams and length-direction cross beams inside the pack body 200, and the connected cells 100 directly play the role of intermediate beams, significantly simplifying the structure of the pack body 200 and reducing the space occupied by the intermediate beams and the space occupied by the mounting structure for the cells 100, thereby improving space utilization and range.

[0037] Naturally, the embodiments of the present application are not limited to those in which no widthwise cross beams and longitudinal cross beams are provided. In some embodiments of the present application, as shown in FIG. 13 , a widthwise cross beam 500 can be provided within the pack body 200, where the widthwise cross beam 500 extends along the width direction B of the battery pack 10, and a plurality of electric cells 100 are arranged along the longitudinal direction A of the battery pack 10 to form a battery array, and the widthwise cross beam 500 divides the battery array into at least two parts along the longitudinal direction A of the battery pack 10, and each part of the battery array includes at least one electric cell 100 and constitutes one battery module 400.

[0038] Of course, in some other embodiments of the present application, as shown in FIG. 12 , a longitudinal cross beam 600 may be provided in the pack body 200, the longitudinal cross beam 600 extending along the longitudinal direction A of the battery pack 10, the electric cells 100 being arranged such that their longitudinal direction is along the width direction B of the battery pack 10, the plurality of electric cells 100 being arranged along the longitudinal direction A of the battery pack 10 to form a battery array, at least two rows of battery arrays being arranged along the width direction B of the battery pack 10 in the pack body 200, each row of battery arrays including a plurality of electric cells 100 arranged along the longitudinal direction A of the battery pack 10, and the longitudinal cross beam 600 being located between the two adjacent rows of battery arrays.

[0039] In some specific examples of the present application, the pack body 200 includes side beams located on both sides of the width direction B of the battery pack 10, and both longitudinal ends of the unit cells 100 are supported by the side beams, and the pack body 200 includes end beams located on both ends of the length direction A of the battery pack 10, and the end beams provide inward pressing force to the unit cells 100 adjacent to them.

[0040] 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, and the first side beam 201, the second side beam 202, the first end beam 203, and the second end beam 204 are connected in sequence, with the first side beam 201 and the second side beam 202 facing each other in the width direction B of the battery pack 10, and the first end beam 203 and the second end beam 204 facing each other in the longitudinal direction A of the battery pack 10. The first side beam 201 and the second side beam 202 provide support to both ends of the battery cell 100 in the longitudinal direction, i.e., one end of the battery cell 100 is supported by the first side beam 201, and the other end is supported by the second side beam 202. The first end beam 203 and the second end beam 204 provide pressing forces on both sides of the thickness direction of the battery cell 100, i.e., the first end beam 203 applies a force toward the second end beam 204 to the battery cell 100 arranged adjacent to the first end beam 203, and the second end beam 204 applies a force toward the first end beam 203 to the battery cell 100 arranged adjacent to the second end beam 204, thereby allowing the multiple battery cells 100 to be closely arranged between the first end beam 203 and the second end beam 204 along the longitudinal direction A of the battery pack 10 and attached to each other. In addition, the first end beam 203 and the second end beam 204 can regulate the position of the multiple cells 100 in the longitudinal direction A of the battery pack 10, and in particular, when the cells 100 expand slightly, they act to cushion the cells 100 and provide inward pressure, preventing the cells 100 from expanding and deforming too much.

[0041] 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 battery pack 10, and a plurality of single batteries 100 are arranged along the longitudinal direction A of the battery pack 10 to form a battery array, and the battery pack 10 includes at least two layers of battery arrays along the height direction C of the battery pack 10 within the pack body 200. Thereby, by optimizing the number of single batteries 100, the space utilization rate is improved to improve the energy density, and it is easy to realize the integration of the BIC and the low-voltage sampler.

[0042] 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 battery pack 10, and a plurality of single batteries 100 are arranged along the width direction B of the battery pack 10, which helps to set the space utilization rate of the battery pack 10 to 55%, 60%, 62%, 65% or more.

[0043] In some specific examples of the present application, as shown in FIGS. 15 and 16, in the longitudinal direction A of the 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 battery pack 10, the closest distance between one end of the single battery 100 and the end beam of the pack body 200 adjacent to it (the above-mentioned one end of the single battery 100) is L3, and the closest distance between the other end of the single battery 100 and the end beam of the pack body 200 adjacent to it (the above-mentioned other end of the single battery 100) is L4, and the length L of the single battery 100 satisfies L3 + L4 < L. Thus, in the longitudinal direction A of the battery pack 10, it is not possible to accommodate another additional single battery 100.

[0044] In other words, the pack body 200 accommodates only one single battery 100 in the longitudinal direction A of the battery pack 10. That is, in the longitudinal direction A of the battery pack 10, the single batteries 100 cannot be arranged in two or more numbers in this direction.

[0045] As can be seen, both sides of the pack body 200 in the width direction B of the battery pack 10 are side beams, and both ends of the pack body 200 in the longitudinal direction A of the battery pack 10 are end beams.

[0046] 15 and 16 , in some specific examples of the present application, the length of the cells 100 extends over the entire longitudinal direction A of the battery pack 10, i.e., the cells 100 extend from one end to the other end of the pack body 200 along the longitudinal direction A of the battery pack 10, the length of the cells 100 is filled in the longitudinal direction A of the battery pack 10, two or more cells 100 cannot be arranged in the pack body 200 in the longitudinal direction A of the battery pack 10, and both longitudinal ends of the cells 100 are fitted into both end walls of the pack body 200 facing the longitudinal direction A, for example, they can be fixed to the pack body 200. This eliminates the need for widthwise cross beams and longitudinal cross beams inside the pack body 200, and the connected cells 100 directly play the role of intermediate beams, significantly simplifying the structure of the pack body 200 and reducing the space occupied by the intermediate beams and the space occupied by the mounting structure for the cells 100, thereby improving space utilization and increasing cruising capacity.

[0047] Naturally, the embodiments of the present application are not limited to those in which no lateral or widthwise cross beams are provided. In some embodiments of the present application, as shown in FIG. 15 , a longitudinal cross beam 600 may be provided within the pack body 200, where the longitudinal cross beam 600 extends along the longitudinal direction A of the battery pack 10, and a plurality of electric cells 100 are arranged along the width direction B of the battery pack 10 to form a battery array, and the longitudinal cross beam 600 divides the battery array into at least two parts along the width direction B of the battery pack 10, and each part of the battery array includes at least one electric cell 100 and constitutes one battery module 400.

[0048] Of course, in some other embodiments of the present application, a widthwise cross beam 500 may be provided within the pack body 200, the widthwise cross beam 500 extending along the width direction B of the battery pack 10, the electric cells 100 being arranged such that their longitudinal direction is along the longitudinal direction A of the battery pack 10, the plurality of electric cells 100 being arranged along the width direction B of the battery pack 10 to form a battery array, at least two rows of battery arrays being arranged along the longitudinal direction A of the battery pack 10 within the pack body 200, each row of battery arrays including a plurality of electric cells 100 arranged along the width direction B of the battery pack 10, and the widthwise cross beam 500 being located between the two adjacent rows of battery arrays.

[0049] In some specific examples of the present application, the pack body 200 includes end beams located at both ends of the longitudinal direction A of the battery pack 10, and both ends of the longitudinal direction of the unit cells 100 are supported by the end beams, and the pack body 200 includes side beams located on both sides of the width direction B of the battery pack 10, and the side beams provide inward pressing force to the unit cells 100 adjacent to them.

[0050] 16 , the pack body 200 has a first side beam 201, a second side beam 202, a first end beam 203, and a second end beam 204, which are connected in sequence, with the first side beam 201 and the second side beam 202 facing each other in the width direction B of the battery pack 10, and the first end beam 203 and the second end beam 204 facing each other in the longitudinal direction A of the battery pack 10. The first end beam 203 and the second end beam 204 provide support to both ends of the battery cell 100 in the longitudinal direction, i.e., one end of the battery cell 100 is supported by the first end beam 203, and the other end is supported by the second end beam 204. The first side beam 201 and the second side beam 202 provide pressing forces on both sides of the thickness direction of the single battery 100, i.e., the first side beam 201 applies a force toward the second side beam 202 to the single battery 100 arranged adjacent to the first side beam 201, and the second side beam 202 applies a force toward the first side beam 201 to the single battery 100 arranged adjacent to the second side beam 202, thereby allowing the multiple single batteries 100 to be closely arranged between the first side beam 201 and the second side beam 202 along the width direction B of the battery pack 10 and to be attached to each other. In addition, the first side beam 201 and the second side beam 202 can positionally regulate the multiple cells 100 in the width direction B of the battery pack 10, and in particular, when the cells 100 expand slightly, they act to cushion the cells 100 and provide inward pressure, thereby preventing the cells 100 from expanding and deforming too much.

[0051] 15 , in some specific examples of the present application, the cell 100 is arranged so that its longitudinal direction is along the longitudinal direction A of the battery pack 10, and a plurality of the cells 100 are arranged along the width direction B of the battery pack 10 to form a battery array, and at least one layer of the battery array is included along the height direction C of the battery pack 10 within the pack body 200. In this way, by optimizing the number of cells 100, it is possible to improve the space utilization rate, increase the energy density, and facilitate the integration of BICs and low-voltage samplers.

[0052] In some specific embodiments of the present application, a plurality of cells 100 can be assembled into a plurality of battery modules 400. The plurality of battery modules 400 can be arranged along the longitudinal direction A of the battery pack 10 (as shown in FIG. 6 ), along the width direction B of the battery pack 10 (as shown in FIG. 15 ), or along the height direction C of the battery pack 10 to form a multi-layer structure (as shown in FIG. 7 ). In other words, regardless of whether the cells 100 extend along the width direction B or the longitudinal direction A of the battery pack 10, the plurality of cells 100 can be arranged in multiple layers along the height direction C of the battery pack 10. Naturally, a plurality of battery modules 400 can be arranged simultaneously along the longitudinal direction A and the height direction C of the battery pack 10, or along the width direction B and the height direction C of the battery pack 10. This optimizes the number of battery modules 400, thereby improving space utilization and energy density, and facilitating the integration of BICs and low-voltage samplers. It should be understood that the battery module 400 in the embodiment of the present application is not provided with structures such as end beams and side beams.

[0053] In the prior art, due to the small size and short length of a cell, the opposing ends of the cell cannot fit into the two opposing side walls of the pack body 200'', so it is necessary to provide a longitudinal cross beam 600' and / or a width cross beam 500' (shown in FIG. 1 ) in the pack body 200'', thus facilitating the assembly of the cells. When the cells are mounted in the pack body 200'' by the battery modules 400', a plurality of cells are present along the width direction of the battery pack 10', i.e., the cells do not extend between the two opposing side walls but extend between the two opposing longitudinal cross beams 600' or width cross beams 500', and the battery modules are fixed to the adjacent longitudinal cross beams 600' and / or width cross beams 500' by fasteners.

[0054] In the prior art, longitudinal cross beams 600′ and / or widthwise cross beams 500′ are provided within the pack body 200″, and the longitudinal cross beams 600′ and / or widthwise cross beams 500′ occupy a large amount of mounting space for accommodating the cells within the pack body 200″, resulting in a low space utilization rate of the pack body 200″. Generally, the ratio of the sum of the volumes of the cells to the volume of the pack body 200″ is about 40%, and even lower. That is, in the prior art, only about 40% of the space within the pack body 200″ is available for mounting the cells, which limits the number of cells that can be accommodated in the pack body 200″, restricts the overall capacity and voltage of the battery pack 10′, and reduces the cruising range of the battery pack 10′.

[0055] The battery pack 10 according to the embodiment of the present application reduces the use of longitudinal cross beams and / or width cross beams in the pack body 200, and even eliminates the need for longitudinal cross beams and / or width cross beams in the pack body 200, thereby reducing the space occupied by the longitudinal cross beams and / or width cross beams in the pack body 200 and improving the space utilization rate of the pack body 200, while reducing the use of end beams and side beams in the battery module 400 and reducing the space occupied by the end beams and side beams in the pack body 200 and improving the space utilization rate of the pack body 200. As many cells 100 as possible can be arranged in the pack body 200, further improving the capacity, voltage, and driving range of the entire battery pack.

[0056] Furthermore, since there is no need to arrange longitudinal cross beams and / or width cross beams within the pack body 200, the manufacturing process for the pack body 200 is simplified, the complexity of assembling the cells 100 is reduced, and production costs are reduced, while the weight of the pack body 200 and the entire battery pack 10 is reduced, resulting in a lightweight battery pack 10. In particular, when the battery pack 10 is installed in an electric vehicle, the driving range of the electric vehicle can be improved and the weight of the electric vehicle can be reduced.

[0057] Furthermore, the cells 100 themselves are used to reinforce the structural strength of the pack body 200. In other words, there is no need to provide an additional reinforcing structure within the pack body 200 to reinforce its structural strength. Instead of a reinforcing structure, the cells 100 themselves ensure the structural strength of the pack body 200, ensuring that the pack body 200 is less likely to deform under the action of external forces. Compared to the battery assembly disclosed in Chinese Patent Document CN107925028A, the pack body 200 not only accommodates and protects the cells 100, but also supports the cells 100 and improves the load-bearing capacity of the entire battery pack 10, and the length of the cells 100 reinforces the strength of the battery pack 10. Furthermore, the increased surface area of each cell 100 increases the heat dissipation area of the cell 100, improving the heat dissipation rate of the cell 100 and further improving the safety of the entire battery pack 10, making the battery pack 10 safer and more reliable.

[0058] In some embodiments of the present application, the cell 100 includes a battery body 110 (which can be understood as the body 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 are V / E≦2000 mm 3 ·Wh -1 This not only ensures a sufficient heat dissipation area and a heat dissipation effect, but also reduces the volume ratio of the cells 100, which helps to make the arrangement of the cells 100 in the battery pack 10 more compact.

[0059] 9 and 10 , the pack body 200 differs from the case of the battery pack disclosed in Chinese Patent Document CN107925028A, particularly in terms of size and load support. The pack body 200 may include a vehicle tray 210 that engages with and connects to the vehicle body / car body to form a structure for accommodating and supporting the cells 100, the vehicle tray 210 being an independently manufactured tray for accommodating and mounting the cells 100. After the cells 100 are mounted in the vehicle tray 210, the vehicle tray 210 can be attached to the car body with fasteners, and can be hung from the chassis of an electric vehicle, for example, to perform the functions of accommodating and supporting the load.

[0060] When the battery pack 10 is used as a battery pack for use in a vehicle to supply electrical energy, the cells 100 can be arranged so that their longitudinal direction is along the longitudinal direction of the vehicle body, i.e., the front-to-rear direction of the vehicle. In this case, the length L of the battery body 110 of the cells 100 may be 400 mm to 2500 mm, and in some embodiments, L may be 400 to 1500 so that the length of the cells 100 matches the length of the vehicle. When the battery pack 10 is used as a battery pack for use in a vehicle to supply electrical energy, the cells 100 can be arranged so that their longitudinal direction is along the width direction of the vehicle body, i.e., the left-to-right direction of the vehicle. In some embodiments of the present application, the length L of the battery body is 700 mm to 2500 mm, and may further be 800 mm to 1500 mm.

[0061] In some embodiments of the present application, as shown in Figure 8, the pack body 200 may be formed directly on the electric vehicle, i.e., the pack body 200 is formed at any suitable location on the electric vehicle and is a device for mounting the cells 100. For example, the pack body 200 may be formed on the chassis of the electric vehicle.

[0062] In some specific embodiments of the present application, when the battery pack 10 is installed in an electric vehicle, unlike the battery pack disclosed in Chinese Patent Document CN107925028A, the 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. The battery pack 10 is arranged so that the width direction B is along the width direction of the vehicle body, i.e., the left-right direction of the vehicle, and the longitudinal direction is along the longitudinal direction of the vehicle body, i.e., the fore-aft direction of the vehicle. Naturally, the present application is not limited thereto, and the battery pack 10 may be arranged so that the width direction B is along the longitudinal direction of the vehicle body and the longitudinal direction A is along the width direction of the vehicle body. In some embodiments of the present application, the first direction and the second direction are two directions perpendicular to each other based on the battery pack, and the first direction may be the width direction of the battery pack and the second direction may be the longitudinal direction of the battery pack.

[0063] As will be understood by those skilled in the art, the orientation of the cells 100 within the battery pack 10 and the orientation of the battery pack 10 in the electric vehicle may be combined in different ways. For example, the cells 100 may be arranged such that their longitudinal direction is aligned with the width direction B of the battery pack 10, or such that their longitudinal direction is aligned with the longitudinal direction A of the battery pack 10. The battery pack 10 may be arranged such that its width direction B is aligned with the width direction of the vehicle body, or such that its width direction B is aligned with the longitudinal direction of the vehicle body. Furthermore, for example, regardless of whether the width direction B of the battery pack 10 is aligned with the width direction of the vehicle body or the longitudinal direction of the vehicle body, the cells 100 are all arranged such that their longitudinal directions are aligned with the width direction of the vehicle body. The relative orientations of the cells 100, the battery pack 10, and the vehicle body can be set according to actual applications to meet different requirements.

[0064] Hereinafter, a cell 100 according to an embodiment of the present invention will be described with reference to the drawings.

[0065] In the following specific examples, the units of length L, width H, and thickness D are all millimeters (mm), and the unit of surface area S is square millimeters (mm 2 ) and the unit of volume V is cubic millimeters (mm 3 ) and the unit of energy E is the watt-hour (Wh).

[0066] 5, a battery 100 according to an embodiment of the present invention includes a battery body 110, which can be understood as the main body excluding small protruding structures such as tabs. The battery body 110 has a length L, a width H, and a thickness D.

[0067] The length L of the battery body 110 is greater than the width H of the battery body 110, and the width H of the battery body 110 is greater than the thickness D of the battery body 110. The length L of the battery body 110 and the width H of the battery body 110 satisfy L / H=4 to 21, and in some specific examples of the present application, the length L of the battery body 110 and the width H of the battery body 110 satisfy L / H=9 to 13.

[0068] In the development of electric vehicles, the voltage plateau requirements for a cell are predetermined, so the volume of the cell is constant. That is, when a certain voltage platform is reached, even if the same chemical materials are used, the volume remains constant because the amount of material contained in the cell is constant. In the cell 100 according to the embodiment of the present application, the ratio of the length L to the width H of the battery body 110 can be designed to rationally flatten the battery body 110 with a constant volume, which is useful for the overall arrangement within the battery pack (e.g., realizing the arrangement of the battery pack 10 according to the above embodiment of the present application), thereby improving the space utilization rate of the battery pack, increasing the energy density of the battery pack, and further improving the cruising capacity of the battery pack. Meanwhile, the cell 100 ensures a sufficiently large heat dissipation area, which allows the internal heat to be transferred to the outside in a timely manner and prevents heat from accumulating inside, thereby meeting the high energy density and supporting improved cruising capacity.

[0069] In some specific embodiments of the present application, in order to optimize the arrangement of the cells 100 within the battery pack and improve the heat dissipation capability of the cells 100, the length L and thickness D of the battery body 110 satisfy L / D=23 to 208, and in some embodiments, L / D=23 to 200, and in other specific embodiments of the present application, the length L and thickness D of the battery body 110 satisfy L / D=50 to 120.

[0070] In some specific embodiments of the present application, as shown in Figure 5, the battery body 110 is configured in a rectangular parallelepiped shape with a smooth outer surface to ensure a certain structural strength. For example, the battery electrode assembly is placed in a rectangular battery case, the opening of the battery case is sealed with a cover plate, and an electrolyte is injected. Compared to batteries using aluminum-plastic composite membranes, the unit cell 100 of the embodiments of the present application has high thermal conductivity and, when combined with conventional battery thermal management structures, can effectively avoid heat dissipation problems caused by large-sized structures. Compared to cylindrical batteries, it has higher space utilization and a simpler manufacturing and assembly process.

[0071] When the battery cell 100 according to the embodiments of the present application is disposed in the pack body 200 of the battery pack 10, the length and thickness directions of the battery body 110 may extend along the horizontal direction, and the width direction of the battery body 110 may extend along the vertical direction. In other words, the battery cell 100 is disposed vertically, and the horizontal and vertical directions are both based on the directions when the battery pack 10 is used (for example, when applied to an electric vehicle).

[0072] In some embodiments of the present application, the arrangement of the cells 100 within the battery pack 10 is optimized to improve energy density and range, and other parameters of the cells 100 are designed to compactly arrange the battery bodies 110 within the limited space of the pack body 200 and to more concentrate energy.

[0073] In some embodiments of the present application, the length L of the battery body 110 and the volume V of the battery body 110 are expressed as L / V=0.0005 mm -2 ~0.002mm -2In some embodiments of the present application, the width H of the battery body 110 and the volume V of the battery body 110 satisfy the following relationship: H / V=0.0001 mm -2 ~0.00015mm -2 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 the following relationship: D / V=0.0000065 mm -2 ~0.00002mm -2 For a battery body 110 with a fixed volume, by designing the ratio of each of the length L, width H, and thickness D to the volume V, it is possible to optimize the spatial distribution of a unit amount of energy, which is thus helpful for arrangement within the pack body 200.

[0074] 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 are L / S=0.002 mm -1 ~0.005mm -1 In some embodiments of the present application, the length L of the battery body 110 and the energy E of the battery body 110 are expressed as L / E=0.8 mm·Wh. -1 ~2.45mm·Wh -1 In some embodiments of the present application, the length L of the battery body 110 and the energy E of the battery body 110 are expressed as L / E=1.65 mm·Wh. -1 ~2.45mm·Wh -1 This helps the cells 100 to cross both opposing sides of the pack body 200 in the longitudinal direction, thus improving the driving range of the battery pack 10 and achieving both structural strength and heat dissipation effect for the cells 100.

[0075] In some other examples of the present application, the surface area S of the battery body 110 and the volume V of the battery body 110 are S / V=0.1 to 0.35 mm -1 This not only ensures a sufficient heat dissipation area and a heat dissipation effect, but also reduces the volume ratio of the cells 100, which helps to make the arrangement of the cells 100 in the battery pack 10 more compact.

[0076] The surface area S of the battery body 110 and the energy E of the battery body 110 are S / E≦1000 mm 2 ·Wh -1 As a result, the surface heat dissipation of the cell 100 is sufficient, which can ensure timely conduction of heat within the battery, especially when the power battery uses a ternary or high-nickel ternary positive electrode material, thereby contributing to battery safety. Furthermore, the cell 100 in the present embodiment is a prismatic cell with a smooth outer surface, which provides a certain degree of structural strength, good metal thermal conductivity, and is less difficult to process and later assemble than a cell that uses a corrugated surface area to increase its surface area.

[0077] In some specific embodiments of the present application, as shown in FIG. 5, the cell 100 further includes a first tab 101 and a second tab 102 .

[0078] The first tab 101 is provided at one longitudinal end of the battery body 110, and the second tab 102 is provided at the other longitudinal end of the battery body 110. In other words, the longitudinal direction of the cell 100 may be the direction of current flow inside the cell 100, i.e., the direction of current flow inside the cell 100 is as shown by arrow B. Since the current flow direction is the same as the longitudinal direction of the cell 100, the effective heat dissipation area of the cell 100 is larger and the heat dissipation efficiency is higher. Here, the first tab 101 may be the positive electrode tab of the cell 100 and the second tab 102 may be the negative electrode tab of the cell 100, or the first tab 101 may be the negative electrode tab of the cell 100 and the second tab 102 may be the positive electrode tab of the cell 100.

[0079] In some embodiments of the present application, as shown in FIG. 5, the cell 100 further includes an explosion-proof valve 103 .

[0080] The explosion-proof valve 103 is provided at least at one end in the longitudinal direction of the battery body 110. If the battery 100 malfunctions and expands, the interior will have sufficient air pressure to break through the inverted sheet in the explosion-proof valve 103, thereby short-circuiting the battery 100, ensuring the safety of the battery 100 and preventing it from exploding.

[0081] As will be understood by those skilled in the art, the provision of the explosion-proof valve 103 can be applied not only to aluminum case batteries but also to pouch batteries, and the explosion-proof valve 103 may be provided at a position other than the end of the battery body 100.

[0082] In some specific embodiments of the present application, explosion-proof valves 103 are provided at both ends of the battery body 110 in the longitudinal direction, and the explosion-proof valves 103 at both ends of the battery body 110 are vented through different vent passages 222 .

[0083] For example, as shown in FIGS. 2, 5, and 11, an explosion-proof valve 103 is provided at a first end of each cell 100 facing the first side beam 201, an exhaust passage 222 is provided inside the first side beam 201, and an air intake 221 is provided at each position of the first side beam 201 corresponding to the explosion-proof valve 103 of each cell 100, and the air intake 221 communicates with the exhaust passage 222, and the pack body 200 is provided with an exhaust port 221 communicating with the exhaust passage 222. A hole is provided, and / or an explosion-proof valve 103 is provided at the second end of the single battery 100 facing the second side beam 202, an exhaust passage 222 is provided inside the second side beam 202, an air intake port 221 is provided at each position on the second side beam 202 corresponding to the explosion-proof valve 103 of each single battery 100, the air intake port 221 is connected to the exhaust passage 222, and an exhaust hole connected to the exhaust passage 222 is provided in the pack body 200.

[0084] In the prior art, when the internal air pressure of a battery rises to a certain level during use, the explosion-proof valve opens, and flames, smoke, or gases inside the battery are released through the explosion-proof valve and collected inside the battery pack. If they cannot be released in a timely manner, they may cause secondary damage to the battery. In the embodiment of the present application, the first side beam 201 and / or the second side beam 202 are provided with air intakes 221 corresponding to the explosion-proof valves 103 of the cells 100, and exhaust passages 222 are provided inside the first side beam 201 and / or the second side beam 202. Therefore, when the air pressure inside the cells 100 rises, the explosion-proof valves 103 open, and flames, smoke, gas, etc. inside the cells 100 pass directly through the air intakes 221 into the exhaust passages 222 in the first side beam 201 and / or the second side beam 202, and are then exhausted from the first side beam 201 and / or the second side beam 202 through the exhaust holes, for example, into the atmosphere. In this way, the flames, smoke, or gases do not collect inside the pack body 200, and secondary damage to the cells 100 is avoided.

[0085] In addition, one end of each of the multiple cells 100 is vented through an exhaust passage 222 in the first side beam 201, and the other end is vented through an exhaust passage 222 in the second side beam 202. In this way, both ends of the cell 100 are vented through different passages, increasing the exhaust distance and forming cross-exhaust, thereby reducing the temperature.

[0086] Hereinafter, an electric vehicle 1 according to an embodiment of the present application will be described with reference to the drawings. The electric vehicle may include electric vehicles such as commercial vehicles, special vehicles, electric bicycles, electric motorcycles, and electric scooters that require a battery pack to provide electric energy for driving.

[0087] As shown in Figures 9 and 10, an electric vehicle 1 according to an embodiment of the present application includes a battery pack 10 according to the above embodiment of the present application, and a pack body 200 may be integrally molded with the electric vehicle or may be an independently manufactured vehicle tray that houses and mounts the single cells 100.

[0088] The electric vehicle 1 according to the embodiment of the present application can improve its driving range without increasing the space occupied by the battery by using the battery pack 10 according to the above embodiment of the present application.

[0089] 9 and 10, in some specific embodiments of the present application, the battery pack 10 is provided at the bottom of the electric vehicle 1, and the pack body 200 is fixedly connected to the chassis of the electric vehicle 1. Since the chassis of the electric vehicle 1 requires a large installation space, by providing the battery pack 10 on the chassis of the electric vehicle 1, the number of cells 100 can be maximized, thereby improving the driving range of the electric vehicle 1.

[0090] 9 and 10 , the electric vehicle 1 includes a battery pack 10 provided at the bottom of the electric vehicle 1, and a pack body 200 is fixedly connected to the chassis of the electric vehicle 1. The battery pack 10 is arranged so that its width direction is along the width direction of the body of the electric vehicle 1, i.e., the left-right direction of the electric vehicle 1, and its length direction is along the length direction of the body of the electric vehicle 1, i.e., the front-rear direction of the electric vehicle 1. In other embodiments, the electric vehicle 1 may include a plurality of battery packs 10 provided at the bottom of the electric vehicle 1, and the shapes and dimensions of the plurality of battery packs 10 may be the same or different, and each battery pack 10 can be adjusted according to the shape and dimensions of the chassis of the electric vehicle 1. The plurality of battery packs 10 are arranged in the length direction of the body, i.e., the front-rear direction.

[0091] In some specific examples of the present application, the ratio of the width F of the pack body 200 to the width W of the vehicle body satisfies 50%≦F / W≦80%. In other examples of the present application, the length L of the battery body in the width direction of the battery pack and the width W of the vehicle body satisfy 46%≦L / W≦76%. In the above examples, it is possible to provide only one pack body 200 along the width direction of the vehicle body. When there are multiple pack bodies 200, the multiple pack bodies 200 are arranged along the longitudinal direction of the vehicle body. Generally, for vehicles, the width W of the vehicle body is 500 mm to 2000 mm, for example, 500 mm, 1600 mm, 1800 mm, or 2000 mm, and the length of the vehicle body is 500 mm to 5000 mm. For passenger cars, the width of the passenger car is generally 500 mm to 1800 mm, and the length of the vehicle body is 500 mm to 4000 mm.

[0092] In some other embodiments of the present application, the width F of the pack body 200 is 500 mm to 1500 mm, which is much larger than the case of the battery pack disclosed in Chinese Patent Document CN107925028A, and is useful for accommodating the battery modules 400 of the battery pack such as CN107925028A, ensuring range, and matching the dimensions of the vehicle body.

[0093] In some specific examples of the present application, the cell 100 includes a battery body 110, and the ratio of the length L of the battery body 110 to the width W of the vehicle body satisfies 46%≦L / W≦76%. In this example, this can be achieved by providing only one cell 100 along the width direction of the vehicle body. In other possible embodiments, when such dimensional requirements are met, this can be achieved by providing multiple battery modules 400 or multiple cells 100 in the longitudinal direction. In some examples, the length L of the battery body 110 is 400 mm to 1500 mm.

[0094] Other configurations and operations of the cell 100, battery pack 10, and electric vehicle 1 according to embodiments of the present application are known to those skilled in the art and will not be described in detail herein.

[0095] An energy storage device according to an embodiment of the third aspect of the present application includes the battery pack according to the embodiment of the first aspect of the present application.

[0096] The following explanation is given using Comparative Example 1 and Examples 1 to 3, Comparative Example 2 and Examples 4 to 5. The battery pack 10 according to the examples of the present application is improved in terms of energy density, etc., by designing the arrangement and dimensional parameters of the cells 100.

[0097] The following examples and comparative examples all use a lithium iron phosphate battery as an example.

[0098] In Comparative Example 1, Example 1, Example 2, and Example 3, the battery pack 10' has a total volume of 213 L, the total volume occupied by its pack body 200', the internal battery management system, and other power distribution modules is 58 L, the remaining volume of the battery pack 10' that can accommodate the cells, transverse cross beams, and longitudinal cross beams is 155 L, the volume of the electrical box is 22.5 L, and the pack body 200 is 1380 mm long, 1005 mm wide, and 137 mm thick. The total volume of the battery pack is 213 L = 1380 x 1005 x 137 x 0.000001 + 22.5.

[0099] (Comparative Example 1) In a battery pack 10′ according to the prior art, as shown in FIG. 1, two widthwise cross beams 500′ and one longitudinal cross beam 600′ are provided within a pack body 200″, and the two widthwise cross beams 500′ and one longitudinal cross beam 600′ divide the cells into six assembled batteries 400′, and each assembled battery 400′ has its own assembled battery case. [Example]

[0100] In a battery pack 10 according to an embodiment of the present application, as shown in FIG. 12 , the cells 100 are arranged such that their longitudinal direction is along the width direction B of the battery pack, and the plurality of cells 100 are arranged along the longitudinal direction A of the battery pack 10. The pack body 200 accommodates two cells 100 in the width direction B of the battery pack. One width-direction cross beam 500 and one length-direction cross beam 600 are provided in the pack body 200. The width-direction cross beam 500 extends along the width direction B of the battery pack 10, and the plurality of cells 100 are arranged along the longitudinal direction A of the battery pack 10 to form a battery array. The width-direction cross beam 500 divides the battery array into two along the longitudinal direction A of the battery pack 10. Two rows of the cells 100 are arranged along the width direction B of the battery pack, and the length-direction cross beam 600 is located between the two adjacent rows of the battery arrays. A first side beam 201 and a second side beam 202 located on both sides of the pack body 200 in the width direction B of the battery pack 10 provide a supporting force to the cells 100, and a first end beam 203 and a second end beam 204 located on both ends of the pack body 200 in the longitudinal direction A of the battery pack 10 provide an inward pressing force to adjacent cells 100. A single layer of battery array is included in the pack body 200 along the height direction C of the battery pack 10. The battery array (also understood as a battery module) of the battery pack 10 is not provided with end beams or side beams. [Example]

[0101] 13 , in a battery pack 10 according to an embodiment of the present application, the cell 100 is arranged such that its longitudinal direction is along the width direction B of the battery pack, and the plurality of cells 100 are arranged along the longitudinal direction A of the battery pack 10, and the pack body 200 accommodates one cell 100 in the width direction B of the battery pack 10, and the cell 100 extends from one side to the other of the pack body 200 in the width direction B of the battery pack 10. One width-direction cross beam 500 is provided in the pack body 200, and no longitudinal cross beam 600 is provided, and the width-direction cross beam 500 extends along the width direction B of the battery pack 10, and the plurality of cells 100 are arranged along the longitudinal direction A of the battery pack 10 to form a battery array, and the first reinforcing rib 500 divides the battery array into two parts along the longitudinal direction A of the battery pack 10. A first side beam 201 and a second side beam 202 located on both sides of the pack body 200 in the width direction B of the battery pack 10 provide a supporting force to the cells 100, and a first end beam 203 and a second end beam 204 located on both ends of the pack body 200 in the longitudinal direction A of the battery pack 10 provide an inward pressing force to adjacent cells 100. A single layer of battery array is included in the pack body 200 along the height direction C of the battery pack 10. The battery array (also understood as a battery module) of the battery pack 10 is not provided with end beams or side beams. [Example]

[0102] In a battery pack 10 according to an embodiment of the present application, as shown in FIG. 14 , a cell 100 is arranged such that its longitudinal direction is aligned with the width direction B of the battery pack, and a plurality of cells 100 are arranged along the longitudinal direction A of the battery pack 10. A pack body 200 accommodates one cell 100 in the width direction B of the battery pack 10, and the cell 100 extends from one side to the other of the pack body 200 in the width direction B of the battery pack 10. A widthwise cross beam 500 and a lengthwise cross beam 600 are not provided within the pack body 200. A first side beam 201 and a second side beam 202 located on both sides of the pack body 200 in the width direction B of the battery pack 10 provide support for the cell 100, and a first end beam 203 and a second end beam 204 located on both ends of the pack body 200 in the longitudinal direction A of the battery pack 10 provide an inward pressing force to adjacent cells 100. A single layer of battery array is included in the pack body 200 along the height direction C of the battery pack 10. The battery array (also understood as a battery module) of the battery pack 10 is not provided with end beams or side beams.

[0103] As will be understood by those skilled in the art by comparing the above Comparative Example 1 with Examples 1 to 3, compared to the battery pack 10' in the prior art, the battery pack 10 according to the examples of the present application can break through the limitations of conventional battery packs in terms of space utilization rate and achieve higher energy density by designing the arrangement, dimensional parameters, and other factors of the cells 100.

[0104] In Comparative Example 2, Example 4, and Example 5, the battery pack 10' has a total volume of 283 L, the sum of the volume occupied by the pack body 200', the internal battery management system, and other power distribution modules is 89 L, the remaining volume of the battery pack 10' that can accommodate the cells and / or longitudinal and lateral cross beams is 221 L, the pack body 200'' is 1380 mm long, 1380 mm wide, and 137 mm thick, the cells are 215 mm long, 118 mm wide, and 13.5 mm high, the volume of the electrical box is 11 L, and the total volume of the battery pack is 310 L = 1580 x 1380 x 137 x 0.000001 + 11.

[0105] (Comparative Example 2) In a battery pack 10′ according to the prior art, as shown in FIG. 1, two widthwise cross beams 500′ and one longitudinal cross beam 600′ are provided within a pack body 200″, and the two widthwise cross beams 500′ and one longitudinal cross beam 600′ divide the cells into six battery modules 400′, and each battery module 400′ has side beams and end beams. [Example]

[0106] 15 , in a battery pack 10 according to an embodiment of the present application, the cell 100 is arranged such that its longitudinal direction is along the longitudinal direction A of the battery pack, and the plurality of cells 100 are arranged along the width direction B of the battery pack 10, and the pack body 200 accommodates one cell 100 in the longitudinal direction A of the battery pack 10, and the cell 100 extends from one side to the other of the pack body 200 in the longitudinal direction A of the battery pack 10. One longitudinal cross beam 600 is provided in the pack body 200, and no width direction cross beam 500 is provided, and the longitudinal cross beam 600 extends along the longitudinal direction A of the battery pack 10, and the plurality of cells 100 are arranged along the width direction B of the battery pack 10 to form a battery array, and the longitudinal cross beam 600 divides the battery array into two parts along the width direction B of the battery pack 10. A first end beam 203 and a second end beam 204 located at both ends of the pack body 200 in the longitudinal direction A of the battery pack 10 provide a supporting force to the cells 100, and a first side beam 201 and a second side beam 202 located on both sides of the pack body 200 in the width direction B of the battery pack 10 provide an inward pressing force to adjacent cells 100. A single layer of battery array is included in the pack body 200 along the height direction C of the battery pack 10. The battery array (also understood as a battery module) of the battery pack 10 is not provided with end beams or side beams. [Example]

[0107] In a battery pack 10 according to an embodiment of the present application, as shown in FIG. 16 , a cell 100 is arranged such that its longitudinal direction is aligned with the longitudinal direction A of the battery pack, and a plurality of cells 100 are arranged along the width direction B of the battery pack 10. A pack body 200 accommodates one cell 100 in the longitudinal direction A of the battery pack 10, and the cell 100 extends from one side of the pack body 200 to the other in the longitudinal direction A of the battery pack 10. A width-direction cross beam 500 and a length-direction cross beam 600 are not provided within the pack body 200. A first end beam 203 and a second end beam 204 located at both ends of the pack body 200 in the longitudinal direction A of the battery pack 10 provide support for the cell 100, and a first side beam 201 and a second side beam 202 located on both sides of the pack body 200 in the width direction B of the battery pack 10 provide an inward pressing force to adjacent cells 100. A single layer of battery array is included in the pack body 200 along the height direction C of the battery pack 10. The battery array (also understood as a battery module) of the battery pack 10 is not provided with end beams or side beams.

[0108] In Comparative Example 3 and Example 6, the battery pack 10′ has a total volume of 414 L, the sum of the volumes occupied by its pack body 200′, the internal battery management system, and other power distribution modules is 58 L, the remaining volume of the battery pack 10′ that can accommodate the cells and / or longitudinal and lateral cross beams is 356 L, the pack body 200″ is 2130 mm long, 1380 mm wide, and 137 mm thick, the volume of the electrical box is 11 L, and the total volume of the battery pack is 414 L = 2130 × 1380 × 137 × 0.000001 + 11.

[0109] (Comparative Example 3) The arrangement of the cells was the same as that in Comparative Example 1. [Example]

[0110] The arrangement of the cells in the battery pack is the same as that in the fifth embodiment. [Example]

[0111] In this embodiment, the battery pack 10' has a total volume of 508 L, the total volume occupied by its pack body 200', the internal battery management system, and other power distribution modules is 119 L, the remaining volume of the battery pack 10' that can accommodate the cells and / or longitudinal and lateral cross beams is 389 L, the pack body 200'' is 2630 mm long, 1380 mm wide, and 137 mm thick, the volume of the electrical box is 11 L, and the total volume of the battery pack is 414 L = 2630 x 1380 x 137 x 0.000001 + 11. The arrangement of the cells in the battery pack is the same as that in Example 5.

[0112] Specific parameters for Examples 1 to 7 and Comparative Examples 1 to 3 are shown in Table 1. The total volume of the cells is the sum of the volumes of the cells, the volume of the battery pack is the total volume of the three-dimensional shape defined by the outer shell of the battery pack, i.e., the volume of the three-dimensional area spatially enclosed by the outer shell of the battery pack, and the volume of the cell accommodating chamber is the volume of the accommodating space defined within the pack body.

[0113] [Table 1]

[0114] As those skilled in the art will understand by comparing the above comparative examples with the examples, the battery pack 10 according to the examples of the present application can break through the limitations of conventional battery packs in terms of space utilization rate and achieve higher energy density by designing the arrangement, dimensional parameters, and other factors of the cells 100. Furthermore, this improvement in energy density increases with an increase in the total volume of the battery pack; that is, the larger the volume of the battery pack, the more significant the effect of improving energy density achieved by the technical means of the examples of the present application.

[0115] In the description herein, a description that refers to the term "specific example," "example," or the like means that the specific feature, structure, material, or characteristic described in combination with the example or example is included in at least one example or example of the present application. In the description herein, exemplary expressions of the above terms are not necessarily limited to the same example or example.

[0116] Although the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is limited by the claims and their equivalents. [Explanation of symbols]

[0117] In the prior art, Battery pack 10', pack body 200'', battery module 400', longitudinal cross beam 600', width cross beam 500' In this application, Electric vehicle 1, battery pack 10, cell 100, battery body 110, pack body 200, tray 210, upper cover 220, first side beam 201, second side beam 202, first end beam 203, second end beam 204, exhaust passage 222, intake port 221, battery module 400, first tab 101, second tab 102, explosion-proof valve 103, longitudinal cross beam 600, widthwise cross beam 500, longitudinal direction A of battery pack 10, widthwise direction B of battery pack 10, heightwise direction C of battery power pack 10, length L of battery body 110, width H of battery body 110, thickness D of battery body 110, width W of vehicle body, width F of pack body 200.

Claims

1. The pack itself, a plurality of unit cells provided in the pack body; a sum V1 of the volumes of the plurality of single cells and a volume V2 of the battery pack satisfy V1 / V2≧55%, the battery pack has a first direction and a second direction that are perpendicular to each other, a longitudinal direction of a battery cell is arranged along the first direction of the battery pack, the plurality of battery cells are arranged along the second direction of the battery pack, the pack body accommodates only one battery cell along the first direction, and the battery cell includes a battery body having a length of 600 to 2500 mm.

2. 2. The battery pack according to claim 1, wherein V1 / V2 is greater than or equal to 60%.

3. 3. The battery pack according to claim 2, wherein V1 / V2 is greater than or equal to 62%.

4. 4. The battery pack according to claim 3, wherein V1 / V2 is greater than or equal to 65%.

5. 2. The battery pack according to claim 1, wherein the first direction is a width direction of the battery pack, the second direction is a longitudinal direction of the battery pack, the longitudinal direction of the battery pack is arranged along the width direction of the battery pack, and the plurality of battery cells are arranged along the longitudinal direction of the battery pack.

6. 6. The battery pack according to claim 5, wherein the pack body accommodates only one of the unit cells in the width direction of the battery pack.

7. 6. The battery pack according to claim 5, wherein the closest distance in the width direction of the battery pack between one end of the battery cell and an adjacent side beam of the pack body is L1, the closest distance between the other end of the battery cell and an adjacent side beam of the pack body is L2, and a length L of the battery cell satisfies L1 + L2 < L.

8. The battery pack according to claim 5 , wherein the cells extend from one side to the other side of the pack body along the width direction of the battery pack.

9. 9. The battery pack according to claim 6, wherein at least one widthwise cross beam extending along the width direction of the battery pack is provided within the pack body, the plurality of unit cells are arranged along the longitudinal direction of the battery pack to form a battery array, the widthwise cross beam divides the battery array into at least two parts along the longitudinal direction of the battery pack, and each part of the battery array includes at least one unit cell.

10. 6. The battery pack according to claim 5, wherein the longitudinal direction of the battery cell is arranged along the width direction of the battery pack, the plurality of battery cells are arranged along the longitudinal direction of the battery pack to form a battery array, at least two rows of battery arrays are arranged along the width direction of the battery pack within the pack body, and at least one longitudinal cross beam extending along the longitudinal direction of the battery pack is provided within the pack body, and the longitudinal cross beam is located between two adjacent rows of battery arrays.

11. the pack body includes side beams located on both sides of the battery pack in a width direction, and both ends of the battery cell in a longitudinal direction are supported by the side beams; The battery pack according to any one of claims 6 to 8 and 10, characterized in that the pack body includes end beams located at both ends of the battery pack in a longitudinal direction, and the end beams apply inward pressing forces to adjacent cells.

12. 11. The battery pack according to claim 1, wherein the first direction is a width direction of the battery pack, the second direction is a longitudinal direction of the battery pack, the longitudinal direction of the cells is arranged along the width direction of the battery pack, the plurality of cells are arranged along the longitudinal direction of the 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 battery pack.

13. 2. The battery pack according to claim 1, wherein the first direction is a width direction of the battery pack, the second direction is a longitudinal direction of the battery pack, the unit cells are arranged such that their longitudinal direction is along the longitudinal direction of the battery pack, and the plurality of unit cells are arranged along the width direction of the battery pack.

14. 14. The battery pack according to claim 13, wherein the pack body accommodates only one of the unit cells in the longitudinal direction of the battery pack.

15. 14. The battery pack according to claim 13, wherein, in the longitudinal direction of the battery pack, the closest distance between one end of the battery cell and an adjacent end beam of the pack body is L3, the closest distance between the other end of the battery cell and an adjacent end beam of the pack body is L4, and a length L of the battery cell satisfies L3 + L4 < L.

16. 14. The battery pack according to claim 13, wherein the unit cells extend from one end to the other end of the pack body along the longitudinal direction of the battery pack.

17. 17. The battery pack according to claim 14, wherein at least one longitudinal cross beam extending along the longitudinal direction of the battery pack is provided within the pack body, the plurality of unit cells are arranged along the width direction of the battery pack to form a battery array, the longitudinal cross 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 unit cell.

18. 14. The battery pack according to claim 13, wherein the longitudinal direction of the battery cell is arranged along the longitudinal direction of the battery pack, the plurality of battery cells are arranged along the width direction of the battery pack to form a battery array, at least two rows of battery arrays are arranged along the longitudinal direction of the battery pack in the pack main body, and at least one widthwise cross beam is provided in the pack main body extending along the width direction of the battery pack, and the widthwise cross beam is located between two adjacent rows of battery arrays.

19. the pack body includes end beams located at both ends of the battery pack in a longitudinal direction, and both ends of the battery cells in the longitudinal direction are supported by the end beams; 19. The battery pack according to claim 14, wherein the pack body includes side beams located on both sides in a width direction of the battery pack, and the side beams apply an inward pressing force to adjacent cells.

20. The battery pack according to any one of claims 14 to 16 and 18, characterized in that the longitudinal direction of the unit cells is arranged along the longitudinal direction of the battery pack, the plurality of unit cells are arranged along the width direction of the 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 battery pack.

21. 19. The battery pack according to claim 1, wherein the pack body includes a vehicle tray that is mated and connected to a vehicle body.

22. 19. The battery pack according to claim 1, wherein a width F of the pack body in the width direction of the battery pack is 500 mm to 1500 mm.

23. The battery pack according to any one of claims 1 to 8, 10, 14 to 16 and 18, further comprising a battery management system and / or a battery thermal management system.

24. The battery pack according to any one of claims 1 to 8, 10, 14 to 16 and 18, wherein the pack body is formed in an electric vehicle.

25. The width direction of the battery pack is aligned with the width direction of the vehicle body, and the length direction of the battery pack is aligned with the length direction of the vehicle body, or The battery pack according to any one of claims 1 to 8, 10, 14 to 16 and 18, characterized in that the width direction of the battery pack is aligned with the longitudinal direction of a vehicle body, and the longitudinal direction of the battery pack is arranged so as to be aligned with the width direction of the vehicle body.

26. 19. The battery pack according to any one of claims 1 to 8, 10, 14 to 16, and 18, wherein the single cells include a battery body, the battery body having a length L, a width H, and a thickness D, the length L of the battery body being greater than the width H, the width H of the battery body being greater than the thickness D, and the length L and width H of the battery body satisfying L / H = 4 to 21.

27. 19. The battery pack according to any one of claims 1 to 8, 10, 14 to 16, and 18, wherein the single battery includes a battery body, and a length L of the battery body and a thickness D of the battery body satisfy an L / D ratio of 23 to 208.

28. The single cell includes a battery body, and the length L of the battery body and the volume V of the battery body are expressed as L / V=0.0005 mm －２ ~0.002mm －２ 19. The battery pack according to claim 1, wherein the above conditions are satisfied.

29. The single cell includes a battery body, and the width H of the battery body and the volume V of the battery body are H / V=0.0001 mm －２ ~0.00015mm －２ 19. The battery pack according to claim 1, wherein the above conditions are satisfied.

30. The single cell includes a battery body, and the thickness D of the battery body and the volume V of the battery body are expressed as D / V=0.0000065 mm －２ ~0.00002mm －２ 19. The battery pack according to claim 1, wherein the above conditions are satisfied.

31. The single cell includes a battery body, and the length L of the battery body and the surface area S of the battery body are L / S=0.002 mm －１ ~0.005mm －１ 19. The battery pack according to claim 1, wherein the above conditions are satisfied.

32. The single cell includes a battery body, and the surface area S of the battery body and the volume V of the battery body are expressed as S / V=0.1 mm －１ ~0.35mm －１ 19. The battery pack according to claim 1, wherein the above conditions are satisfied.

33. 2. The battery pack according to claim 1, wherein the length L of the battery body is 700 mm to 2500 mm.

34. 34. The battery pack according to claim 33, wherein the unit cell includes a battery body having a length L of 800 mm to 1500 mm.

35. 19. The battery pack according to claim 1, wherein the cells are aluminum-shell prismatic cells.

36. 36. The battery pack according to claim 35, wherein the unit cell includes a battery body and an explosion-proof valve, the explosion-proof valve being provided at least at one end in the longitudinal direction of the battery body.

37. 36. The battery pack according to claim 35, wherein the unit cell includes a battery body, and an explosion-proof valve is provided at each end of the battery body in the longitudinal direction.

38. An electric vehicle comprising the battery pack according to any one of claims 1 to 37.

39. 39. The electric vehicle according to claim 38, wherein the 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.

40. 40. The electric vehicle according to claim 38 or 39, characterized in that the electric vehicle includes one battery pack provided at the bottom of the electric vehicle, the battery pack being arranged so 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.

41. 41. The electric vehicle according to claim 40, wherein the width F of the pack body and the width W of the vehicle body satisfy the relationship 50%≦F / W≦80%.

42. 42. The electric vehicle of claim 41, wherein the single battery includes a battery body, and the length L of the battery body in the width direction of the battery pack and the width W of the vehicle body satisfy 46%≦L / W≦76%.

43. 43. The electric vehicle according to claim 41 or 42, wherein the width W of the vehicle body is 500 mm to 2000 mm.

44. An energy storage device comprising a battery pack according to any one of claims 1 to 20 and 22 to 37.

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