Power battery pack and electric vehicle

Abstract

To provide a power battery pack which has advantages of high space utilization, large energy density, a long service life, high reliability, low costs, high quality, and the like.SOLUTION: A power battery pack 10 includes: a pack body 200; and a plurality of cells 100, directly disposed and arranged in the pack body 200. Each cell 100 extends from a first side of the pack body 200 to a second side of the pack body 200, and the first side and the second side are disposed opposite each other. The first side of the pack body 200 is provided with a first side wall, the second side thereof is provided with a second side wall, an end of the cell 100 is supported by the first side wall, and the other end thereof is supported by the second side wall.SELECTED DRAWING: Figure 14

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application was filed by B.W.D. Company Limited on January 9, 2019. Chinese patent application numbers "201910021244.0" and "201910020967.9" , "201910021246.X", "201910021248.9", "2019 Claiming priority to Patent Nos. 10021247.4 and 201910020925.5 No. 60 / 699,992, the entire contents of which are incorporated herein by reference.

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

[0003] In the prior art, for example, the power battery pack applied to the electric vehicle is mainly The main body and the multiple battery modules attached inside the pack body, each consisting of multiple single cells This includes the following:

[0004] As user demand for electric vehicles' driving range increases, When the internal space is limited, the power battery pack of the prior art requires a large amount of internal space. The utilization rate of the battery is low, and the energy density of the power battery pack cannot meet the demand. This has also become an important factor limiting the development of electric vehicles. Summary of the Invention [Problem to be solved by the invention]

[0005] In the related prior art, as shown in FIG. 1, the pack body 2 of the power battery pack 10′ 00'' is formed by the transverse cross beams 500' and the longitudinal cross beams 600', The mounting area of ​​the battery module 400' is often divided into several parts, for example, CN107 The battery module 400' in the assembled battery disclosed in 925028A is secured by a method such as a screw. , and are fixed to the transverse cross beams 500' or the longitudinal cross beams 600'. The battery module 400' includes a plurality of cells arranged in order. The battery array is formed by connecting the battery cells together, and end plates and / or side plates are provided on the outside of the battery array. The battery array includes end plates and side plates, which are fixed together to form a space for accommodating the battery array. At the same time, the end plates and side plates are connected by screws to secure the battery array. or by other connecting members such as tie rods.

[0006] The inventors have found through testing and analysis that the battery module 400' is secured in place in the width direction by a structure such as a screw. When the cross beams are fixed to the longitudinal cross beams 500' or 600', the space is In addition, the weight increases due to the increase in connecting parts such as screws. The JUL 400' is designed with a combination of end plates and side plates, and both the end plates and side plates are fixed. 200 '', the pack body 200 ″ has a thickness and height of 200 , so that the internal space of the pack body 200 ″ is wasted. It has been found that the volume utilization rate of the body 200'' is low. The power battery pack 10' in the figure is the sum of the volumes of the cells in the pack body 200'' and the pack The ratio of the volume to the main body 200'' is about 50% in all cases, and even as low as 40%.

[0007] According to the power battery pack 10' according to the above-described prior art example, the battery module 400' The end plates, side plates, and internal connection and mounting configuration of the power battery pack 10' are all The utilization rate of the internal space of the main body 200'' is reduced, and as a result, in the power battery pack 10', The ratio of the total volume of the cells to the volume of the pack body 200'' is too low, and the energy density However, this has not been able to meet the ever-increasing demands of users for the range of electric vehicles. This has become a major factor limiting the development of electric vehicles. The assembly process is complicated, and the battery module is first assembled and then the battery module is Since it needs to be installed inside the pack body, it increases the labor and material costs, and at the same time ,Since multiple assembly processes are required, defective products may occur during the assembly process of the power battery pack. The probability of failure increases, and multiple assembly attempts may cause the power battery pack to loosen and become less firmly attached. This may increase the possibility of damage to the quality of the power battery pack and may cause a deterioration in the stability of the power battery pack. This reduces the reliability and reliability of the system.

[0008] The present application aims to solve at least one of the technical problems in the prior art. Therefore, the present invention has high space utilization rate, high energy density, long range capability, and high reliability. One of the aims is to provide a power battery pack with the advantages of low cost, high quality, etc. The purpose is as follows.

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

[0010] A power battery pack according to an embodiment of the first aspect of the present application comprises a pack body and a battery pack in the pack body. a plurality of unit cells arranged and disposed directly on the first unit cell of the pack body; The first side and the second side of the pack body are opposed to each other. a first side of the pack body having a first side wall and a second side of the pack body having a second side wall; one end of the cell is supported by the first side wall and the other end is supported by the second side wall. do.

[0011] The power battery pack according to the present application is configured by directly arranging a plurality of cells in the pack body. This eliminates the need for various mounting structures for attaching battery modules as in conventional battery packs. This improves the utilization rate of the internal space of the pack body, and reduces the total volume of the cells inside the pack body. In other words, the ratio of the volume of the cell to the volume of the pack body is increased, and a constant volume is maintained. More cells can be assembled in a space to increase the energy density of the power battery pack. At the same time, the assembly process is simple and the process is simple, and the cost of labor and materials is low. This reduces costs and assembly steps, and reduces defects during the assembly process of the power battery pack. Reduces the probability of defects, reduces the possibility of loosening and the mounting not being strong, Improve the quality of the battery pack and improve the stability and reliability of the battery pack. The cell has one end supported by the first side wall and the other end supported by the second side wall, and the cell itself is As a support structure, the weight of the support structure itself is maintained by being supported by the first side wall and the second side wall. In order to support the force, various mounting methods for mounting battery modules in conventional battery packs are used. The structure can be omitted.

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

[0013] The electric vehicle according to the embodiment of the present application is equipped with the power battery pack according to the embodiment of the first aspect of the present application. By utilizing this, it is possible to improve the driving range without increasing the space occupied by the battery. can. [Brief explanation of the drawings]

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

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the preferred embodiments of the present invention, examples of which are illustrated in the drawings and identified throughout. The same or similar reference numerals indicate the same or similar parts or have the same or similar functions. The embodiments described below with reference to the drawings are merely illustrative and should not be construed as limiting the scope of the present application. These are merely illustrative and should not be construed as limiting the present application.

[0016] In the description of this application, the terms "longitudinal direction," "lateral direction," "length," "width," and "thickness" are used interchangeably. The orientation or positional relationship indicated by "," "inside," "outside," etc. is based on the orientation or positional relationship shown in the drawings. The devices shown are merely for ease of explanation and brevity of the present application. Or the parts must have a specific orientation and be configured and operated in a specific orientation. The present application should not be construed as limiting the scope of the present invention, as it does not indicate or suggest that isn't it.

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

[0018] Considering the current state of power battery packs in the prior art, the present application aims to develop a battery pack with high space utilization rate and energy saving. A power battery pack having advantages such as high energy density and long range, and We provide electric vehicles that can

[0019] The power battery pack 10 according to the first embodiment of the present invention comprises a pack body 200 and a plurality of The battery pack 200 includes a plurality of cells 100. The cells 100 are directly arranged in a pack body 200. The cells 100 are inserted from the first side of the pack body 200 to the second side of the pack body 200. The first side and the second side are provided opposite to each other. It is located at the edge of the block body 200.

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

[0021] The term "directly" in the above direct arrangement refers to the arrangement of the plurality of cells 10 in the accommodation chamber. 0 are not pre-assembled into a battery module before being installed in the containment chamber. During the assembly process, a plurality of cells 100 are placed in a receiving chamber, thereby For example, a battery array formed of the cells 100 may have end plates, side plates, etc. (For example, the structure shown in FIG. 1, in which the cells are first assembled into a battery module.) and then placed inside the pack body).

[0022] The power battery pack 10 according to the present application has a plurality of cells 100 arranged in a pack body 200. By directly placing and arranging the battery in the storage chamber, the battery module in the conventional battery pack can be By eliminating the need for various mounting structures for the module, the utilization rate of the internal space of the pack body is improved. In other words, the sum of the volumes of the cells 100 inside the pack body 200 is increased. The ratio of the volume of the pack body 200 to the volume of the 100 is increased, and more space can be stored in a given volume. Assembling many cells 100 to improve the energy density of the power battery pack 10 At the same time, the assembly process is simple, and the cost of labor and materials is reduced. In addition, the number of assembly steps is reduced, and the number of defective products during the assembly process of the power battery pack 10 is reduced. This reduces the probability of loosening and the possibility of the attachment not being strong, Improve the quality of the battery pack 10 and improve the stability and reliability of the power battery pack 10. do.

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

[0024] As shown in FIGS. 2 to 16, the power battery pack 10 according to the embodiment of the present invention comprises a pack body 2. 00 and a plurality of single cells 100.

[0025] In some embodiments, for example, in industry-standard pack body 200 structures, , a tray 210 and a top cover 220, The tray 210 defines a space for accommodating a plurality of cells 100. and covered by a top cover 220. In this embodiment, the tray 210 is The upper cover 220 may be a flat plate-shaped box body. The upper opening of the tray 210 is sealed, and in a common solution in the industry, the tray 210 has an upper The upper cover 220 is an open box body, and the lower side is an open box body opposite to it. The upper opening of the tray 210 corresponds to the lower opening of the upper cover 220. When assembled, the two are aligned to form a package for the internal storage space.

[0026] Of course, in some other specific embodiments, for example, the entire cell may be waterproof. If the pack body is directly attached to the electric vehicle, a top cover is required. There is no need for a single tray, and a battery array consisting of multiple cells can be supported by just one tray. In some embodiments, the pack body includes side beams positioned around its periphery. Alternatively, there is no need to provide a frame, and the pack body is closer to a flat plate, and there is no frame, and it is simple. The battery is mounted directly on the flat plate, or a cross beam is mounted on the flat plate, and then the cross beam is mounted on the flat plate. More specifically, the pack body supports the unit cells and is formed by the unit cells. This can be thought of as a bracket to mount the battery array to an electric vehicle, and the complete pack It doesn't have to be limited to the body.

[0027] The plurality of cells 100 are provided in a pack body 200. The pack body 200 is It can be understood as a case for accommodating the unit cell 100, for example, a tray 210 and an upper The tray 210 and the top cover 220 may include a plurality of single-cell batteries. The storage space for the battery 100 is defined, and the plurality of cells 100 are provided in a tray 210 and The storage space is covered by the external cover 220, and the storage space is the entire undivided space. In other words, as shown in FIGS. 14 and 16, the power battery pack 10 is The cross beam 500 extending along the width direction B is not provided, and the power battery pack 10 is not provided with a longitudinal cross beam 600 extending along the longitudinal direction A. The longitudinal ends of the pond 100 are supported by the pack body 200 .

[0028] For example, a first side of the pack body 200 may have a first side wall and a second side may have a second side wall. One end of the cell 100 is supported by the first side wall, and the other end is supported by the second side wall. Supported.

[0029] In some other embodiments of the present application, the pack body 200 may have a bottom plate, and may be a single The battery 100 is supported on the bottom plate.

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

[0031] The plurality of cells 100 are provided in a pack body 200. The pack body 200 is It can be understood as a case for accommodating the unit cell 100, for example, a tray 210 and an upper The tray 210 and the top cover 220 may include a plurality of single-cell batteries. The storage space for the battery 100 is defined, and the plurality of cells 100 are provided in a tray 210 and The plurality of single-cell batteries are covered by a cover 220, that is, are provided in the storage space. The sum of the volumes of the pond 100, V1, and the volume of the storage space, V0, satisfies 81%≦V1 / V0≦97%. Add.

[0032] As will be understood by those skilled in the art, V1 is determined by the volume of each cell 100 and the number of cells 100. V0 is the product of the total volume of the pack body 200 and the tray bottom plate, the circumference of the tray bottom plate The four frames and top cover enclose the case volume and the internal battery management system and other components. Subtract the volume occupied by the power distribution module, and the remaining volume is the cell 100, the width direction crossbeam, This refers to the volume that can accommodate the frame 500 and longitudinal cross beams 600.

[0033] The power battery pack 10 according to the embodiment of the present application has a storage space formed in the pack body 200. The plurality of cells 100 are directly arranged and aligned in the storage space, The ratio of the sum of the volumes of the above to the volume of the storage space, i.e., 81%≦V1 / V0≦97%, for example, By limiting V1 / V0 to 81% or less, the space utilization rate of the power battery pack 10 is By improving the battery pack 10, more cells 100 can be placed in the power battery pack 10, i.e., the unit More energy supply structures can be placed within the space, resulting in higher energy density This will improve the aircraft's range without increasing the space it occupies.

[0034] In some specific examples of the present application, as shown in FIGS. 2 to 16, the motions according to the embodiments of the present application The battery pack 10 includes a pack body 200 and a plurality of cells 100 .

[0035] The power battery pack 10 according to the embodiment of the present application has a length of the cell 100 and a length extension direction of the cell. By limiting the ratio to the vehicle body dimensions in the direction of the load, i.e., 46%≦L0 / X≦75% , making full use of the space of the vehicle body, and arranging more single cells 100 in a unit space of the vehicle body; In other words, more energy supply structures can be placed within a unit space, resulting in Improve energy density to increase range without increasing the space occupied. can be done.

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

[0037] The plurality of cells 100 are provided in a pack body 200. The pack body 200 is It can be understood as a case for accommodating the unit cell 100, for example, a tray 210 and an upper The tray 210 and the top cover 220 may together hold a plurality of cells. The storage space for the cells 100 is defined, and the cells 100 are provided in a tray 210 and The cover 220 is provided in the storage space, and the storage space has a bottom surface The bottom surface is a part of the bottom wall that defines the storage space. A storage space is formed in the pack body 200, and the plurality of unit cells are accommodated in the storage space. the sum S1 of the areas of the orthogonal projections of the plurality of cells 100 on the bottom surface; The area S0 of the bottom surface satisfies 72%≦S1 / S0≦88%.

[0038] As will be understood by those skilled in the art, S1 is the area of ​​the orthogonal projection of each cell 100 onto the bottom surface. is the product of the number of cells 100 and S0 is the area of ​​the base. refers to the entire flat area of ​​the bottom surface, not including the surface area of ​​some uneven structures, in other words, It can be understood as the area of ​​the orthogonal projection of the base onto a horizontal plane.

[0039] The power battery pack 10 according to the embodiment of the present application has a total area of ​​the orthogonal projections of the cells 100 onto the bottom surface. By limiting the ratio of the area of ​​the bottom to the area of ​​the bottom, i.e., 72%≦S1 / S0≦88%, the power The space utilization rate of the power battery pack 10 is improved, and more cells 10 can be stored in the power battery pack 10. 0, that is, to place more energy supply structures in a unit space, This will improve the energy density and increase the range without increasing the space occupied. do.

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

[0041] As will be understood by those skilled in the art, V1 is determined by the volume of each cell 100 and the number of cells 100. and V2 is the total volume of the three-dimensional shape defined by the outer casing of the power battery pack 10. That is, the volume including the internal space of the power battery pack 10, that is, the volume of the power battery pack V1 / V2 is the volume of the three-dimensional area enclosed in space by the outer boundary of 10. V1 / V2 is the space utilization ratio It can be defined as:

[0042] The power battery pack 10 according to the embodiment of the present application has a volume of the power battery pack 100. By limiting the ratio of the volume of the power battery pack 1 to the volume of the power battery pack 10, i.e., V1 / V2 ≧ 55%, 0 space utilization rate is improved, and more single cells 100 are arranged in the power battery pack 10. , that is, to arrange more energy supply structures in a unit space, the energy density This will improve the aircraft's range without increasing the space it occupies.

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

[0044] As found by testing, the power battery pack 10 according to the embodiment of the present application and the power battery pack 10 according to Chinese Patent Document C The test subjects were the assembled batteries disclosed in N107925028A, both of which had an electric capacity of 7 Take a 3kWh LPF (lithium iron phosphate battery) as an example. Since it is necessary to place a power distribution unit (U), both are equipped with PDUs for comparison. In comparison, the power battery pack 10 according to the embodiment of the present application has a space utilization rate of 62.5%. The energy density is 281wh / L, which is disclosed in Chinese patent document CN107925028A. The assembled battery has a space utilization rate of 51% and an energy density of 257wh / L. From the above, the battery pack disclosed in the Chinese patent document CN107925028A has the following characteristics: space utilization rate and In terms of energy density, both are lower than the power battery pack 10 according to the embodiment of the present application, and The sustained capacity is also much lower than that of the power battery pack 10 according to the embodiment of the present application.

[0045] As will be appreciated by those skilled in the art, several factors can affect the performance of the device, for example, the bottom of the tray. Internal collision prevention space and liquid cooling system, heat insulation material, insulating protection material, thermal safety auxiliary parts, flame exhaust The internal space of the pack body 200 is made up of peripheral components including an exhaust passage, a high-voltage power distribution module, etc. For occupancy, the maximum value of V1 / V2 is generally 80%, i.e., V1 / V2≦80% is.

[0046] Hereinafter, a power battery pack 10 according to a specific embodiment of the present invention will be described with reference to the drawings. The battery pack 10 has a longitudinal direction indicated by an arrow A, a width direction indicated by an arrow B, and a height direction indicated by an arrow C. Indicated by arrow C.

[0047] In some specific embodiments of the present application, as shown in FIGS. 2 to 4, the cell 100 , the longitudinal direction of the power battery pack 10 is arranged along the width direction B, and a plurality of single cells 100 are arranged along the longitudinal direction A of the power battery pack 10, and thus, the power battery pack 1 It helps to set the space utilization to 55%, 60% or even higher.

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

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

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

[0051] In some specific examples of the present application, as shown in FIGS. 3 and 4, the length of the single battery 100 extends throughout the width direction B of the power battery pack 10. That is, along the width direction B of the power battery pack 10, the single battery 100 extends from one side of the pack body 200 to the other side, and the length of the single battery 100 fills the width direction B of the power battery pack 10. The pack body 200 is In some specific examples of the present application, as shown in FIGS. 3 and 4, the length of the single battery 100 extends throughout the width direction B of the power battery pack 10. That is, along the width direction B of the power battery pack 10, the single battery 100 extends from one side of the pack body 200 to the other side, and the length of the single battery 100 fills the width direction B of the power battery pack 10. 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 battery 100 cannot be arranged in two or more numbers. 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 battery 100 cannot be arranged in two or more numbers. Two or more unit cells 100 cannot be arranged in the width direction B of the cell 10. The longitudinal ends of 00 fit into the opposing side walls of the pack body 200 in the width direction B. For example, it can be fixed to the pack body 200. No cross beams in the width direction and the length direction are required, and the connected cells 100 It more directly plays the role of a reinforcing rib, greatly simplifying the structure of the pack body 200 and providing reinforcement. The space occupied by the strong ribs and the space occupied by the mounting structure of the unit cells 100 is reduced, and space utilization is improved. Improve the rate of return and improve the range.

[0052] In some embodiments of the present application, the pack body 200 is The side beams are located on both sides of B, and both ends of the cell 100 in the longitudinal direction are The pack body 200 is supported by the beam and is positioned at both ends of the power battery pack 10 in the longitudinal direction A. The end beams include end beams that are inwardly spaced from the adjacent cells 100. Provides a directional pressure.

[0053] As shown in FIGS. 3 and 4, the pack body 200 includes a first side beam 201, a second side beam 202, and a It has a side beam 202, a first end beam 203 and a second end beam 204, A first side beam 201, a second side beam 202, a first end beam 203, and a The two end beams 204 are connected in series to form the first side beam 201 and the second side beam 202. The first end beam 202 faces the power battery pack 10 in the width direction B, and the second end beam 203 The first end beam 201 and the second end beam 204 face each other in the longitudinal direction A of the power battery pack 10. The side beam 201 and the second side beam 202 are supported at both ends of the cell 100 in the longitudinal direction. Provides support, i.e., one end of the cell 100 is supported by the first side beam 201; The other end is supported by the second side beam 202. The end beams 204 provide pressure on both sides of the thickness of the cell 100, i.e., The first end beam 203 is connected to the battery cell 1 provided adjacent to the first end beam 203. 00 applies a force toward the second end beam 204, and the second end beam 204 , the first end beam 204 is connected to the cell 100 provided adjacent to the second end beam 204. 03, and thus the plurality of cells 100 form a power battery pack 10 The first end beam 203 and the second end beam 204 are fastened together along the longitudinal direction A of the The first end beam 203 can be densely arranged and attached to each other. and the second end beam 204 are arranged to support the plurality of cells 10 in the longitudinal direction A of the power battery pack 10. In particular, when the cell 100 expands slightly, the cell 100 The expansion and deformation of the cell 100 are controlled by the action of providing a buffer and inward pressure. This can prevent the size from becoming too large.

[0054] In some embodiments of the present application, as shown in FIG. 7, the cell 100 has a longitudinally movable The plurality of cells 100 are arranged along the width direction B of the power battery pack 10. The cells are arranged along the longitudinal direction A of the pack 10 to form a battery array, and the cells move within the pack body 200. The battery pack 10 includes at least two layers of battery arrays along the height direction C. By optimizing the number of cells 100, the space utilization rate can be improved and the energy density can be increased. Lifting it upward facilitates the integration of the BIC and the low-voltage sampler.

[0055] In some specific embodiments of the present application, as shown in FIGS. 15 and 16, the single battery 1 00 is arranged such that its longitudinal direction is along the longitudinal direction A of the power battery pack 10, and a plurality of single batteries 100 are arranged along the width direction B of the power battery pack 10. In this way, it helps to set the space utilization rate of the power battery pack 10 to 50%, 60% or more.

[0056] In some specific examples of the present application, as shown in FIGS. 15 and 16, in the longitudinal direction A of the power battery pack 1 0, 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 10 0. Specifically, in the longitudinal direction A of the power battery pack 10, the closest distance between one end of the single battery 100 and the end beam of the pack body 200 adjacent to it (the above-mentioned one end of the single battery 100) is L3, and the closest distance between the other end of the single battery 100 and the end beam of the pack body 200 adjacent to it (the above-mentioned other end of the single battery 100) is L4. The length L0 of the single battery 100 satisfies L3 + L4 < L0. In this way, in the longitudinal direction A of the power battery pack 10, another additional single battery 100 cannot be accommodated. That is, the pack body 200 accommodates only one single battery 100 in the longitudinal direction A of the power battery pack 10. In other words, in the longitudinal direction A of the power battery pack 10, the single battery 100 cannot be arranged in a number of two or more. It can be understood that on both sides of the pack body 200 in the width direction B of the power battery pack 10, there are

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

[0058] As can be understood, on both sides of the pack body 200 in the width direction B of the power battery pack 10, there are The power battery pack 10 has a longitudinal direction A, and both ends of the pack body 200 are It is a beam.

[0059] In some embodiments of the present application, as shown in FIGS. 15 and 16, the length of the cell 100 The length extends in the longitudinal direction A of the power battery pack 10, i.e., The unit cells 100 extend from one end to the other end of the pack body 200 along the hand direction A. The length of the pack body 200 is filled in the longitudinal direction A of the power battery pack 10. Two or more cells 100 can be arranged in the longitudinal direction A of the battery pack 10. First, both ends of the cell 100 in the longitudinal direction are connected to the opposite end walls of the pack body 200 in the longitudinal direction A. and can be fixed to the pack body 200, for example. No cross beams in the width direction or the length direction are required inside 200, and the The cells 100 directly play the role of reinforcing ribs, greatly simplifying the structure of the pack body 200. The space occupied by the reinforcing ribs and the space occupied by the mounting structure for the unit cells 100 are reduced. This will improve space utilization and enhance cruising capability.

[0060] In some embodiments of the present application, the pack body 200 is The end beams are positioned at both ends of the direction A, and both ends of the cell 100 in the longitudinal direction are The pack body 200 is supported by a beam, and is positioned on both sides of the power battery pack 10 in the width direction B. The side beams are internally connected to the adjacent cells 100. Provides a directional pressure.

[0061] As shown in FIG. 16, the pack body 200 includes a first side beam 201, a second side beam 202, and a beam 202, a first end beam 203 and a second end beam 204, Side beam 201, second side beam 202, first end beam 203, second end beam The side beam 204 is connected in series with the first side beam 201 and the second side beam 202. The beams 202 face each other in the width direction B of the power battery pack 10, and are connected to the first end beam 203 and the second end beam 204. The first end beam 204 faces the longitudinal direction A of the power battery pack 10. The frame 203 and the second end beam 204 provide support to both ends of the unit cell 100 in the longitudinal direction. That is, one end of the cell 100 is supported by the first end beam 203 and the other end The end of the first side beam 201 is supported by the second end beam 204. The beam 202 provides a pressing force on both sides of the thickness of the cell 100, i.e., the first The side beam 201 is connected to the cell 100 adjacent to the first side beam 201. A force is applied to the second side beam 202, and the second side beam 202 The first side beam 201 is connected to the cell 100 provided adjacent to the second side beam 202. In this way, the plurality of cells 100 are moved across the width of the power battery pack 10. Closely arranged between the first side beam 201 and the second side beam 202 along the direction B The first side beam 201 and the second side beam 202 can be bonded to each other. The side beams 202 position and regulate the positions of the plurality of cells 100 in the width direction B of the power battery pack 10. In particular, when the cell 100 expands slightly, a buffer is provided to the cell 100. The expansion and deformation of the cells 100 are large. It can prevent excessive

[0062] In some embodiments of the present application, as shown in FIG. 15, the cell 100 has a longitudinal direction The power battery pack 10 is arranged along the longitudinal direction A, and the plurality of cells 100 are The battery pack 10 is arranged in the width direction B to form a battery array, and the battery pack 10 is arranged in the width direction B to form a battery array. The power battery pack 10 includes at least two layers of battery arrays along the height direction C. By optimizing the number of cells 100, the space utilization rate can be improved and the energy density can be increased. This improves the performance and makes it easier to integrate BIC and low-voltage samplers.

[0063] In some specific embodiments of the present application, the plurality of cells 100 may be arranged in a plurality of battery arrays. 400, and the plurality of battery arrays 400 can be assembled along the longitudinal direction of the power battery pack 10. They may be arranged along the direction A (as shown in FIG. 6) or along the width direction B of the power battery pack 10. 15, and may be arranged in a multi-layer structure along the height direction C of the power battery pack 10. In other words, the cells 100 may be arranged to form a power Regardless of whether it extends along the width direction B of the battery pack 10 or along the longitudinal direction A, The plurality of cells 100 are arranged in layers along the height direction C of the power battery pack 10. Of course, the battery array 400 can be arranged in a plurality of power battery packs 1. The power battery pack 10 may be arranged along the longitudinal direction A and the height direction C of the power battery pack 10 at the same time. The battery cells may be arranged simultaneously along the width direction A and the height direction C. By optimizing the number of 0s, the space utilization rate can be improved, and the energy density can be increased. In addition, it is easy to realize the integration of BIC and low-voltage samplers. The array 400 is free of structures such as end plates and side plates.

[0064] In the prior art, the size of the unit cell is small, the length is short, and the opposite ends of the unit cell are Since the two opposing side walls of the block body 200'' cannot be fitted together, Longitudinal cross beams 600' and / or widthwise cross beams within pack body 200'' 500' (shown in FIG. 1) is required, thus facilitating the assembly of the cells. After the cells are mounted in the pack body 200'' in the form of a battery module 400', A plurality of unit cells are present along the width direction of the battery pack 10'. Two longitudinal cross beams facing each other do not extend between the two side walls. 600' or the widthwise cross beams 500', and the battery modules are fastened to The cross beams 600' and / or 500' are fixed to adjacent longitudinal cross beams 600' and / or transverse cross beams 500'. can be.

[0065] In the prior art, longitudinal cross beams 600' and / or Transverse cross beams 500' are provided, and longitudinal cross beams 600' and / or transverse cross beams The cross beam 500' is a large cross beam for accommodating the cells in the pack body 200''. Since the pack body 200 '' occupies a large installation space, the space utilization rate of the pack body 200 '' is low. The ratio of the sum of the volumes to the volume of the pack body 200'' is about 40%, which is even lower, i.e. That is, in the pack body 200'' of the prior art, there are four spaces for mounting the unit cells. 0%, the number of cells that can be accommodated in the pack body 200" is limited, and the power The capacity and voltage of the entire battery pack 10' are limited, and the driving range of the power battery pack 10' is low. .

[0066] The power battery pack 10 according to the embodiment of the present application has a longitudinal cross-section in the pack body 200. The use of beams and / or cross beams in the pack body 200 is reduced, and the use of longitudinal beams and / or cross beams in the pack body 200 is also reduced. In this way, longitudinal cross beams and / or transverse cross beams may be omitted. The space occupied by the directional cross beams and / or the widthwise cross beams within the pack body 200 is reduced. This reduces the space utilization rate of the pack body 200, while reducing the space required for the end plates and By reducing the use of end plates and side plates, the space occupied by the end plates and side plates in the pack body 200 is reduced. This improves the space utilization rate of the pack body 200. By arranging the batteries as much as possible inside the pack body 200, the capacity and voltage of the entire power battery pack can be reduced. and improve cruising capability.

[0067] In addition, longitudinal cross beams and / or width cross beams may be provided within the pack body 200. Since there is no need to place the cells 100 in the pack body 200, the manufacturing process of the pack body 200 is simplified. 0 and reduce the assembly complexity and production costs, while This reduces the weight of the entire pack 10, thereby realizing a lighter power battery pack 10. When the battery pack 10 is installed in an electric vehicle, it can improve the driving range of the electric vehicle and It is also possible to reduce the weight of electric automobiles.

[0068] In addition, the single cell 100 itself is used to reinforce the structural strength of the pack body 200, In other words, it is necessary to provide a reinforcing structure inside the pack body 200 to reinforce its structural strength. Instead of a reinforcement structure, the structural strength of the pack body 200 is ensured by the cells 100 themselves, This ensures that the body 200 is not easily deformed under the action of external force. Compared to the battery pack disclosed in CN107925028A, the pack body 200 has one battery 00, but also supports the single cell 100 and powers the battery pack. 10The overall load-bearing capacity can be improved, and the length of the single battery 100 In addition, the surface area of ​​the single cell 100 is increased. This increases the heat dissipation area of ​​the cell 100, improves the heat dissipation rate of the cell 100, and further improves the operation. Improve the safety of the entire power battery pack 10, making the power battery pack 10 safer and more reliable It is possible.

[0069] In some specific embodiments of the present application, as shown in Figs. The main body 200 is different from the case of the assembled battery disclosed in Chinese patent document CN107925028A. The pack body 200 is configured to be connected to the vehicle body / chassis, particularly in terms of size and load support. The battery is engaged and connected to the vehicle body to form a structure that houses and supports the battery cell 100. The vehicle tray 210 may include a vehicle tray 210 that is independently manufactured and This is a tray that accommodates and mounts the battery 100. The battery 100 is mounted in the vehicle tray 210. After installation, the vehicle tray 210 can be attached to the vehicle body using fasteners, e.g. , suspended from the chassis of the electric vehicle to perform the functions of accommodation and load support.

[0070] The power battery pack 10 is a power battery pack used in a vehicle to supply electrical energy. When used in this manner, the longitudinal direction of the cell 100 is aligned with the width direction of the vehicle body, i.e., the left-right direction of the vehicle. In this case, the length of the cell 100 can be adjusted to the width of the vehicle. In this way, the length L of the battery body 110 of the cell 100 is 600 mm to 2500 mm. The distance may be selected to be 600 mm to 1500 mm.

[0071] In some embodiments of the present application, as shown in FIG. 8, the pack body 200 is an electric automatic It may be formed directly on the vehicle, i.e., the pack body 200 may be mounted on any suitable The pack body 200 is a device formed in a position where the battery pack 200 is mounted. It may be formed on the chassis of an electric vehicle.

[0072] In some specific embodiments of the present application, the power battery pack 10 is disposed in an electric vehicle. Unlike the battery pack disclosed in Chinese patent document CN107925028A, The battery pack 10 includes a battery management system (BMS), a battery connector, a battery sampler, and a battery. a power battery, including at least one of the components required for the vehicle battery, such as a thermal management system; The pack 10 has a width direction B that is along the width direction of the vehicle body, i.e., the left-right direction of the vehicle, and a longitudinal direction The vehicle is arranged along the longitudinal direction of the vehicle body, i.e., along the front-rear direction of the vehicle. However, the present invention is not limited to this, and the power battery pack 10 may be arranged such that the width direction B is along the longitudinal direction of the vehicle body and The longitudinal direction A may be arranged along the width direction of the vehicle body.

[0073] As will be understood by those skilled in the art, the orientation of the cells 100 within the power battery pack 10 The orientation of the power battery pack 10 in the electric vehicle can be combined in different ways. For example, the length of the cells 100 is aligned along the width direction B of the power battery pack 10. The longitudinal direction of the power battery pack 10 may be aligned with the longitudinal direction A of the power battery pack 10. Alternatively, the power battery pack 10 may be arranged so that the width direction B is aligned with the width direction of the vehicle body. , the width direction B may be arranged along the longitudinal direction of the vehicle body, and further, for example, the power battery The pack 10 is arranged so that the width direction B is along the width direction of the vehicle body or along the longitudinal direction of the vehicle body. Regardless of whether the battery is disposed along the width direction of the vehicle body, the length direction of the battery cell 100 is aligned along the width direction of the vehicle body. The relative arrangement direction of the cell 100, the power battery pack 10, and the vehicle body is as follows: Different requirements can be met by configuring them according to the actual application.

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

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

[0076] As shown in FIG. 5, the cell 100 according to the embodiment of the present invention includes a battery body 110. The main body 110 can be understood as the main body portion excluding small-sized protruding structures such as tabs. The pond body 110 has a length L, a width H and a thickness D.

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

[0078] In the development of electric vehicles, the requirements for the voltage plateau of the cells are given. Therefore, the volume of the cell becomes a constant value, that is, when a certain voltage platform is reached, When using the same chemical materials, the amount of material contained in the cell is constant, so the body The cell 100 according to the embodiment of the present application has a length L, a width H, and a thickness L of the cell body 110. By designing the ratio, it is possible to reasonably flatten the battery body 110 with a constant volume. This helps with overall alignment within the power battery pack (e.g., the power battery according to the above embodiment of the present application). By realizing the arrangement of the battery pack 10, the space utilization rate of the power battery pack is improved. Improve the energy density of the power battery pack to improve the driving range of the power battery pack. On the other hand, it is necessary to ensure that the cell 100 has a sufficiently large heat dissipation area and to dissipate the internal heat in a timely manner. By preventing heat from gathering inside by simply conducting it to the outside, high energy - It can match the density and support increased range.

[0079] The arrangement of the cells 100 in the power battery pack is optimized, and the heat dissipation ability of the cells 100 is improved. To improve the performance, the length L and thickness D of the battery body 110 should satisfy L / D=23 to 200. .

[0080] In some specific embodiments of the present application, as shown in FIG. 5, the battery body 110 includes: The outer surface is formed in a smooth rectangular parallelepiped shape so as to have a certain structural strength, and is suitable for, for example, a battery electrode. The body is placed inside the rectangular battery case, the opening of the battery case is sealed with the cover plate, and the electrolyte is poured in. Compared with the battery using the aluminum-plastic composite film, the cell 100 according to the embodiment of the present application has a thermal It has high conductivity and, combined with conventional battery thermal management structures, solves the heat dissipation problem caused by large-sized structures. Compared with cylindrical batteries, it has a higher space utilization rate and is easier to manufacture. The assembly process is simpler.

[0081] The cell 100 according to the embodiment of the present application is disposed in the pack body 200 of the power battery pack 10. In this case, the battery body 110 has a lengthwise direction and a thickness direction that extend along the horizontal direction, and a width direction that extends along the horizontal direction. That is, the cells 100 are arranged vertically, and the horizontal direction The vertical and horizontal directions are both used when the power battery pack 10 is used (for example, when an electric vehicle (when applied to) is the reference direction.

[0082] In some embodiments of the present application, the arrangement of the cells 100 in the power battery pack 10 is optimized. Optimization improves energy density, increases range, and overcomes the limited capacity of the pack body 200. In the space provided, the arrangement of the battery body 110 can be made more compact, and energy can be more concentrated. To achieve this, other parameters of the cell 100 are designed.

[0083] For example, the length L of the battery body 110 and the volume V of the battery body 110 are expressed as L / V=0.0005 ~0.002mm -2 The width H of the battery body 110 and the volume V of the battery body 110 are H / V=0.0001~0.00015mm -2 The thickness D of the battery body 110 and the battery The volume V of the main body 110 is D / V = 0.0000065 to 0.00002 mm -2 fulfill As a result, for a battery body 110 with a certain volume, the length L, width H, and thickness D are By designing the ratio of V to volume V, the spatial distribution of unit energy can be optimized. and thus aids in placement within the pack body 200.

[0084] The length L of the battery body 110 and the surface area S of the battery body 110 are L / S=0.002 to 0.0 05mm -1 The length L of the battery body 110 and the energy E of the battery body 110 are / E=0.8~2.45mm·Wh -1 and L / E=1.65~2.45mm·W h -1 This allows the cells 100 to be packed in the longitudinal direction. This helps to straddle both opposing sides of the main body 200, thus increasing the driving range of the power battery pack 10. This improves the capacity, while also achieving both the structural strength and heat dissipation effect of the cell 100.

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

[0086] The surface area S of the battery body 110 and the energy E of the battery body 110 are S / E≦1000 m m 2 ·Wh -1 In this way, the heat dissipation from the surface of the cell 100 is sufficient, and particularly, When using nickel-based or high-nickel ternary positive electrode materials, the heat inside the battery can be transferred in a timely manner. This can ensure the safety of the battery. 00 is a rectangular battery with a smooth outer surface, has a certain structural strength, and has good metal thermal conductivity. This reduces the processing and later assembly difficulties compared to batteries that use corrugations to increase surface area. Sai.

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

[0088] The first terminal 101 is provided at one end of the battery body 110 in the longitudinal direction, and the second terminal 10 2 is provided at the other end in the longitudinal direction of the battery body 110. The direction of the current may be the direction of the current inside the cell 100, i.e., inside the cell 100. The direction of the current is as shown by the arrow B. Since the direction is the same as the longitudinal direction, the effective heat dissipation area of ​​the cell 100 is larger and the heat dissipation efficiency is higher. Here, the first terminal 101 is connected to the positive electrode tab of the cell 100, and the second terminal 1 1. The first terminal 102 is connected to the negative electrode tab of the cell 100, or the first terminal 101 is connected to the negative electrode tab of the cell 100. 0, and the second terminal 102 is connected to the positive tab of the cell 100.

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

[0090] The explosion-proof valve 103 is provided at least at one end in the longitudinal direction of the battery body 110. When 100 fails and expands, its interior breaks through the inverted seat in the explosion-proof valve 103. By having sufficient air pressure, the cell 100 is short-circuited and the safety of the cell 100 is ensured. Therefore, the battery 100 can be prevented from exploding.

[0091] As will be understood by those skilled in the art, the provision of the explosion-proof valve 103 is advantageous in that it It can be applied not only to batteries but also to pouch batteries. It may be provided at a location other than the end of 100.

[0092] In some specific embodiments of the present application, the battery body 110 has two ends in the longitudinal direction. The explosion-proof valves 103 at both ends of the battery body 110 are provided with different exhaust passages. Exhaust via 222.

[0093] For example, as shown in FIGS. 2, 5 and 11, the first side beam 20 of the cell 100 An explosion-proof valve 103 is provided at the first end of the first side beam 201, and an exhaust valve is provided inside the first side beam 201. A passage 222 is provided to connect the first side beam 201 to the explosion-proof valve 103 of each cell 100. An intake port 221 is provided at each of the positions corresponding to the intake port 221, and the intake port 221 communicates with an exhaust passage 222. The pack body 200 is provided with an exhaust hole communicating with the exhaust passage 222, and / or An explosion-proof valve 103 is provided at a second end of the pond 100 toward the second side beam 202, and a second An exhaust passage 222 is provided inside the first side beam 202, and the second side beam 202 An air intake 221 is provided at each position of the cell 100 corresponding to the explosion-proof valve 103. The air outlet 221 communicates with the exhaust passage 222, and the pack body 200 has an exhaust port 222 communicating with the exhaust passage 222. Pores are provided.

[0094] In the prior art, the internal air pressure of a battery increases to a certain extent during use. If the explosion-proof valve is opened, the flame, smoke or gas inside the cell will be released through the explosion-proof valve, causing the power If these particles accumulate inside the battery pack and cannot be discharged in a timely manner, they may cause secondary damage to the cells. In the present embodiment, the first side beam 201 and / or the second side The beam 202 is provided with an intake port 221 corresponding to the explosion-proof valve 103 of the 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 cell 100 increases, the explosion-proof valve 103 opens, The flame, smoke, gas, etc. inside the first side beam 221 passes through the intake port 221 directly. 01 and / or the second side beam 202 into the exhaust passage 222 and through the exhaust hole. and is discharged from the first side beam 201 and / or the second side beam 202, for example, The flame, smoke or gas is discharged into the atmosphere through the exhaust hole. The flame, smoke, or gas will not collect inside the battery 100 and cause secondary damage to the battery 100. Avoid this.

[0095] In addition, one end of each of the plurality of cells 100 is connected to the first side beam 20. The other end of the exhaust gas is exhausted through the exhaust passage 222 in the second side beam 202. 2, and thus both ends of the cell 100 are vented through different passages, and the vent distance is By increasing the separation and creating an alternating exhaust, the temperature can be reduced.

[0096] Hereinafter, an electric vehicle 1 according to an embodiment of the present application will be described with reference to the drawings. The electric vehicle includes: A power battery pack is used to provide electrical energy to drive the vehicle. This includes commercial vehicles, special purpose vehicles, electric bicycles, electric motorcycles, electric scooters and other electric vehicles. That's fine.

[0097] As shown in FIGS. 9 and 10, the electric vehicle 1 according to the embodiment of the present application is The pack body 200 includes the power battery pack 10 according to the present invention, and may be integrally formed with an electric vehicle. It may also be an independently manufactured vehicle tray that houses and mounts the cells 100. stomach.

[0098] The electric vehicle 1 according to the embodiment of the present application utilizes the power battery pack 10 according to the above embodiment of the present application. By using this, it is possible to improve the driving range without increasing the space occupied by the battery. do.

[0099] In some specific embodiments of the present application, as shown in Figures 9 and 10, The pack 10 is provided at the bottom of the electric vehicle 1, and the pack body 200 is attached to the chassis of the electric vehicle 1. Since the installation space on the chassis of the electric vehicle 1 is large, the power battery pack By providing the battery pack 10 on the chassis of the electric vehicle 1, the number of the cells 100 can be reduced as much as possible. By increasing the capacity, the driving range of the electric vehicle 1 can be improved.

[0100] In some embodiments of the present application, as shown in FIGS. 9 and 10, the electric vehicle 1 includes: The electric vehicle 1 includes one power battery pack 10 provided at the bottom, and the pack body 200 includes: The power battery pack 10 is fixedly connected to the chassis of the electric vehicle 1, and the width direction of the power battery pack 10 is The width direction of the vehicle body, i.e., the left-right direction of the electric vehicle 1, and the longitudinal direction of the electric vehicle 1 The electric vehicle 1 is arranged along the longitudinal direction of the vehicle body, that is, along the front-rear direction of the electric vehicle 1. The electric vehicle 1 includes a plurality of power battery packs 10 provided at the bottom of the electric vehicle 1. The shapes and dimensions of the battery packs 10 may be the same or different. Each power battery pack 10 can be adjusted according to the shape and size of the chassis of the electric vehicle 1, and multiple The power battery packs 10 are arranged along the longitudinal direction of the vehicle body, that is, along the front-to-rear direction.

[0101] In some embodiments of the present application, the ratio of the width F of the pack body 200 to the width W of the vehicle body is 5 0%≦F / W≦80% is satisfied, and in this embodiment, one pack is formed along the width direction of the vehicle body. This can be realized by providing only the main body 200, and when there are multiple pack main bodies 200 The plurality of pack bodies 200 are arranged along the longitudinal direction of the vehicle body. For vehicles, the width W of the vehicle body is 500mm to 2000mm, for example, 500mm, 1600mm mm, 1800mm, 2000mm, and the body length is 500mm to 5000mm. For passenger cars, the width of the car is generally 500mm to 1800mm, and the length of the car body is The thickness is 500mm to 4000mm.

[0102] In some other embodiments of the present application, the width F of the pack body 200 is 500 mm to 1500 mm. 00mm, which is larger than the battery case disclosed in Chinese patent document CN107925028A. It is much larger than the CN107925028A and can accommodate 400 battery arrays of assembled batteries. This helps ensure range and fits into the vehicle dimensions.

[0103] In some embodiments of the present application, the cell 100 includes a battery body 110, The ratio of the length L of the vehicle 110 to the width W of the vehicle body satisfies 46%≦L / W≦76%. This can be achieved by providing only one cell 100 along the width direction of the vehicle body. In another possible embodiment, if such dimensional requirements are met, a plurality of longitudinal This can be achieved by providing a battery array 400 or a plurality of cells 100. In this embodiment, the length L of the battery body 110 is 400 mm to 1500 mm.

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

[0105] Below, Comparative Example 1 and Examples 1 to 3, Comparative Example 2 and Examples 4 to 5, Comparative Example 3 and Example 6 The power battery pack 10 according to the embodiment of the present application is described in the following paragraphs 1 to 7. The arrangement of the cells 100 and By designing the dimensional parameters, etc., the energy density and other aspects can be improved.

[0106] In the following examples and comparative examples, a lithium iron phosphate battery with a power of 73 kWh was used. For example:

[0107] In Comparative Example 1 and Examples 1 to 3, the total volume of the power battery pack is 213 L. The length of the box body is 1380mm, width is 1005mm, and thickness is 13mm. The volume of the case and the volume occupied by the internal battery management system and other power distribution modules The sum is 58L, and the remaining cells and / or transverse cross beams or longitudinal cross beams are The volume that can accommodate the cross beam is 155L. Comparative Example 1

[0108] As shown in FIG. 1, the power battery pack 10′ of the prior art includes a pack body 200″. Two transverse cross beams 500' and one longitudinal cross beam 600' are provided within the Two transverse cross beams 500' and one longitudinal cross beam 600' are formed. The cells are divided into six assembled batteries 400', and each assembled battery 400' is There are cases where: [Example]

[0109] In the battery pack 10 according to the embodiment of the present application, as shown in FIG. 12, the unit cell 100 is The longitudinal direction of the power battery pack is aligned with the width direction B of the power battery pack, and the plurality of single cells 100 are arranged to form the power battery pack. The pack body 200 is arranged along the longitudinal direction A of the battery pack 10. Two cells 100 are accommodated in the width direction B. There are provided cross beams 500 and one longitudinal cross beam 600, and the widthwise cross beams The frame 500 extends along the width direction B of the power battery pack 10, and the plurality of single cells 100 The battery packs 10 are arranged along the longitudinal direction A to form a battery array, and the widthwise cross-beam The battery array 500 is divided into two parts along the longitudinal direction A of the power battery pack 10. The plurality of cells 100 are arranged in two rows along the width direction B of the power battery pack. The longitudinal cross beam 600 is positioned between two adjacent rows of battery arrays. The first beams of the pack body 200 located on both sides of the power battery pack 10 in the width direction B are The first beam 201 and the second beam 202 provide support to the cell 100 and support the power battery pack 1. The third beam 203 and the fourth beam 204 of the pack body 200 are located on both sides of the pack body 200 in the longitudinal direction A. The ribs 204 provide an inward pressing force to adjacent cells 100. The battery array does not have end plates or side plates. [Example]

[0110] In the power battery pack 10 according to the embodiment of the present invention, as shown in FIG. 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 The pack body 200 is arranged along the longitudinal direction A of the power battery pack 10. The battery pack 1 accommodates one cell 100 in the width direction B of the battery pack 1. Extending from one side to the other of the pack body 200 in the width direction B of the pack body 200. One widthwise cross beam 500 is provided, and one longitudinal cross beam 600 is provided. The width-direction cross beam 500 extends along the width direction B of the power battery pack 10, The plurality of cells 100 are arranged along the longitudinal direction A of the power battery pack 10 to form a battery array. The width-direction cross beam 500 supports the battery array in the longitudinal direction A of the power battery pack 10. The packs located on both sides of the width direction B of the power battery pack 10 are divided into two parts along the line. The first beam 201 and the second beam 202 of the main body 200 provide a supporting force for the unit cell 100. The third beams of the pack body 200 located on both sides of the power battery pack 10 in the longitudinal direction A are provided. The fourth beam 203 and the fourth beam 204 provide an inward pressing force to the adjacent cells 100. The battery array of the power battery pack 10 does not have end plates or side plates. [Example]

[0111] In the power battery pack 10 according to the embodiment of the present invention, as shown in FIG. 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 The pack body 200 is arranged along the longitudinal direction A of the power battery pack 10. The battery pack 1 accommodates one cell 100 in the width direction B of the battery pack 1. The pack body 200 extends from one side to the other side in the width direction B of the pack body 200. There are no transverse cross beams 500 or longitudinal cross beams 600. The first beams 201 and 202 of the pack body 200 are located on both sides of the width direction B of the pond pack 10. The second beam 202 provides support to the single cell 100 and extends in the longitudinal direction A of the power battery pack 10. The third beam 203 and the fourth beam 204 of the pack body 200 located at both ends of the It provides an inward pressing force to the adjacent cells 100. There are no end plates or side plates.

[0112] As can be seen by comparing the above Comparative Example 1 with Examples 1 to 3, those skilled in the art Compared with the power battery pack 10' in the power battery pack 10 of the present invention, the power battery pack 10 in the power battery pack 10 of the present invention is a single battery. The design of the arrangement, dimensional parameters and other factors of the reservoir 100 allows for space utilization efficiency that is comparable to that of conventional power plants. By overcoming the limitations of the battery pack, higher energy density can be achieved.

[0113] In Comparative Example 2 and Examples 4 and 5, the total volume of the power battery pack was 310 L. The length of the main body is 1580mm, width is 1380mm, and thickness is 137mm. The volume of the case, the volume occupied by the internal battery management system and other power distribution modules, The sum of the above is 89L, and the remaining cells and / or cross beams or longitudinal beams are The volume that can accommodate the directional cross beam is 221L. Comparative Example 2

[0114] As shown in FIG. 1, the power battery pack 10′ of the prior art includes a pack body 200″. Two transverse cross beams 500' and one longitudinal cross beam 600' are provided within the Two transverse cross beams 500' and one longitudinal cross beam 600' are formed. The cells are divided into six battery modules 400', and each battery module 400' The casing also has side plates and end plates. [Example]

[0115] In the power battery pack 10 according to the embodiment of the present invention, as shown in FIG. 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 The battery pack accommodates one cell 100 in the longitudinal direction A of the battery pack. 10 in the longitudinal direction A from one side of the pack body 200 to the other side. 0, one longitudinal cross beam 600 is provided, and one widthwise cross beam 500 is provided. The longitudinal cross beam 600 is not connected to the power battery pack 10 along the longitudinal direction A. The plurality of cells 100 are arranged along the width direction B of the power battery pack 10. The longitudinal cross beams 600 extend the battery array across the width of the power battery pack 10. The power battery pack 10 is divided into two parts along the direction B. The power battery pack 10 is divided into two parts along the direction B. The third beam 203 and the fourth beam 204 of the pack body 200 are supported by the unit cell 100. The first and second battery packs 200 are located on both sides of the power battery pack 10 in the width direction B. The first beam 201 and the second beam 202 exert an inward pressing force on the adjacent cells 100. The battery array of the power battery pack 10 does not have end plates or side plates. [Example]

[0116] In the power battery pack 10 according to the embodiment of the present invention, as shown in FIG. 16, the single cell 100 is , the longitudinal direction of the power battery pack is arranged along the longitudinal direction A, and a plurality of single cells 100 are The pack body 200 is arranged along the width direction B of the power battery pack 10. The battery pack 1 contains one cell 100 in the longitudinal direction A. 0 in the longitudinal direction A from one side to the other side of the pack body 200. The cross beams 500 and the cross beams 600 are not provided. The third beams 203 and 204 of the pack body 200 located at both ends of the longitudinal direction A of the battery pack 10 The fourth beam 204 provides support to the cells 100 and extends in the width direction of the power battery pack 10. The first beam 201 and the second beam 202 of the pack body 200 located on both sides of B are The power battery pack 10 provides an inward pressing force to the adjacent cells 100. There are no end plates or side plates.

[0117] In Comparative Example 3 and Example 6, the total volume of the power battery pack was 414 L. The body length is 2130, width is 1380, and thickness is 137mm. The sum of the volume of the case and the volume occupied by the internal battery management system and other power distribution modules is 58L, and the actual remaining single cell and / or width direction cross beam or longitudinal direction The volume that can accommodate the cross beam is 312L.

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

[0119] As shown in FIG. 1, the power battery pack 10′ of the prior art includes a pack body 200″. Two transverse cross beams 500' and one longitudinal cross beam 600' are provided within the Two transverse cross beams 500' and one longitudinal cross beam 600' are formed. The cells are divided into six assembled batteries 400', and each assembled battery 400' is There are cases where: [Example]

[0120] and [Example]

[0121] In the power battery pack 10 according to the embodiment of the present invention, as shown in FIG. 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 The battery pack accommodates one cell 100 in the longitudinal direction A of the battery pack. 10 in the longitudinal direction A from one side of the pack body 200 to the other side. There are no cross beams 500 or cross beams 600 in the width direction or the length direction. The third beams 203 of the pack body 200 located at both ends of the battery pack 10 in the longitudinal direction A The fourth beam 204 provides support to the cells 100 and extends across the width of the power battery pack 10. The first beam 201 and the second beam 202 of the pack body 200 located on both sides of the direction B are , which provides an inward pressing force to the adjacent cells 100. No end plates or side plates are provided on (a).

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

[0123] As can be seen by comparing the above Comparative Example 1 with Examples 1 to 3, those skilled in the art Compared with the power battery pack 10' in the power battery pack 10 of the present invention, the power battery pack 10 in the power battery pack 10 of the present invention is a single battery. The design of the arrangement, dimensional parameters and other factors of the reservoir 100 allows for space utilization efficiency that is comparable to that of conventional power plants. By overcoming the limitations of the battery pack, higher energy density can be achieved.

[0124] Those skilled in the art will be able to understand the above by comparing Comparative Example 2 with Examples 4 and 5, and Comparative Example 3 with Examples 6 and 7. As described above, the power battery pack 10 according to the embodiment of the present application has the arrangement and dimensional parameters of the cells 100. Through the design of meters and other factors, the space utilization rate can break through the limitations of traditional power battery packs. By doing so, a higher energy density can be achieved. The improvement is magnified with increasing total volume of the power battery pack, i.e., the volume of the power battery pack The larger the value, the more significant the effect of improving the energy density by the technical means of the embodiment of the present application.

[0125] In the description of this specification, descriptions that refer to the terms "specific example," "specific example," etc. The specific features, structures, materials or characteristics described in combination with the examples are not intended to be limiting of the present application. It means that the term is included in at least one embodiment or example. Illustrative expressions are not necessarily limited to the same embodiment or example.

[0126] While embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that the principles and principles of the present application may be Various changes, modifications, substitutions and variations may be made to these embodiments without departing from the scope of the present invention. The scope of this application is limited by the claims and their equivalents. [Explanation of symbols]

[0127] In the prior art, Power battery pack 10', pack body 200'', battery module 400', longitudinal clamp Loss beam 600', widthwise cross beam 500' In this application, Electric vehicle 1, power battery pack 10, single cell 100, battery body 110, pack body 20 0, 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 221, battery array 400, first terminal 101, second terminal 102, explosion-proof valve 103, long The cross beam 600 in the hand direction, the cross beam 500 in the width direction, and the longitudinal direction of the power battery pack 10 A, width direction of the power battery pack 10 B, height direction of the battery power pack 10 C, battery body 110 length L of the battery body 110, width H of the battery body 110, thickness D of the battery body 110, width W of the vehicle body, 00 width F.

Claims

1. A power battery pack including a pack body and a plurality of unit cells arranged directly within the pack body, the unit cell extends from a first side of the pack body to a second side of the pack body, the first side and the second side being opposed to each other; a first side wall is provided on a first side of the pack body, a second side wall is provided on a second side of the pack body, one end of the battery is supported by the first side wall, and the other end is supported by the second side wall; The battery cell includes a battery body having a length L, a width H, a thickness D, and a volume V, the length L of the battery body being greater than the width H, and the width H of the battery body being greater than the thickness D; The battery body is L / H = 4 to 21, and D / V=0.00000065mm －２ ~0.00002mm －２ Charge the power battery pack.

2. 2. The power battery pack according to claim 1, wherein the length L of the battery body of each of the single cells is 600 mm or more and 2500 mm or less.

3. 2. The power battery pack according to claim 1, wherein the length L of the battery body of each of the single cells is 400 mm or more and 1500 mm or less.

4. 2. The power battery pack according to claim 1, wherein the length L of the battery body and the width H of the battery body satisfy L / H=9 to 13.

5. 2. The power battery pack according to claim 1, wherein the length L of the battery body and the thickness D of the battery body satisfy L / D=23 to 208.

6. The surface area S of the battery body and the energy E of the battery body are S / E≦1000 mm ２ ・Wh －１ The power battery pack according to claim 1 , wherein

7. 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 The power battery pack according to claim 1 , wherein

8. 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 The power battery pack according to claim 1 , wherein

9. The surface area S of the battery body and the volume V of the battery body are S / V = 0.1 mm －１ ~0.35mm －１ The power battery pack according to claim 1 , wherein

10. 2. The power battery pack according to claim 1, wherein the unit cells are aluminum-cased prismatic cells, each of the unit cells including a battery body and an explosion-proof valve, the explosion-proof valve being provided at at least one of both ends in the length direction of the battery body.

11. 2. The power battery pack according to claim 1, wherein an explosion-proof valve is provided at each end of the battery body in the longitudinal direction, and the explosion-proof valves at both ends communicate with separate exhaust passages.

12. A power battery pack as described in any one of claims 1 to 11, wherein the single cells are directly housed in the pack body and form a battery array.

13. An electric vehicle comprising a chassis and the power battery pack of claim 12.

14. 14. The electric vehicle according to claim 13, wherein the power battery pack is provided at the bottom of the electric vehicle, and the pack body is fixedly connected to a chassis of the electric vehicle.

15. 14. The electric vehicle according to claim 13, including one power battery pack provided at the bottom of the electric vehicle, the width direction of the power battery pack being arranged along the width direction of a body of the electric vehicle, and the length direction of the power battery pack being arranged along the length direction of the body of the electric vehicle.

16. 16. The electric vehicle according to claim 15, wherein 50%≦F / W≦80% is satisfied, where F is the width of the pack body and W is the width of the vehicle body.

17. 16. The electric vehicle according to claim 15, wherein the single cell includes a battery body, and the length L of the battery body in the width direction of the power battery and the width W of the vehicle body satisfy the relationship 46%≦L / W≦76%.

18. 17. The electric vehicle according to claim 16, wherein a width W of the vehicle body is equal to or greater than 500 mm and equal to or less than 2000 mm.

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