Battery packs and electric vehicles

Abstract

To provide a battery pack having advantages such as high space utilization, increased energy density, strong cruising capacity, high reliability, low cost, and high quality.SOLUTION: The present invention relates to a battery pack 10 and an electric vehicle. The battery pack includes a pack body 200 and a plurality of single batteries 100 provided within the pack body. A sum V1 of volumes of the plurality of single batteries and a volume V2 of the battery pack satisfies V1 / V2≥55%. The battery pack has a first direction and a second direction perpendicular to each other. The single batteries are arranged such that the longitudinal direction is along the first direction of the battery pack. The plurality of single batteries is arranged along the second direction of the battery pack. The single battery includes a battery body with a length of 400 to 2500 mm.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application was filed on January 9, 2019 by BYD Company Limited. Chinese patent application no. "201910021244.0", "201910020967.9" , "201910021246.X", "201910021248.9", "2019 Claiming priority to "10021247.4" and "201910020925.5" No. 60 / 339,933, 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 a battery pack having the same Regarding electric vehicles. [Background technology]

[0003] In the prior art, for example, a battery pack applied to an electric vehicle mainly includes a pack body. and a plurality of battery modules each consisting of a plurality of unit cells, which are attached inside the pack body. This includes the following:

[0004] As user requirements for the driving range of electric vehicles gradually increase, When the space at the bottom is limited, the power battery pack in the prior art has a large internal space. The utilization rate of the battery pack is low, and the energy density of the battery pack cannot meet the demand. This is also becoming a major 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, a pack body 200 of a battery pack 10′ '' is formed by a transverse cross beam 500' and a longitudinal cross beam 600'. The battery module 400' mounting area is often divided into two parts, for example, CN10792 The battery module 400' of the battery pack disclosed in 5028A is clamped in the width direction by screws or the like. The battery module 4 is fixed to the loss beam 500' or the longitudinal cross beam 600'. 00' includes a plurality of unit cells arranged in sequence, and the plurality of unit cells are arranged to form a battery array. The battery array is generally formed with end beams and / or side beams on the outside. The end beam and the side beam are fixed. The end beams and side beams are connected to each other to surround the space that houses the battery array. To achieve the fixation of the joint, the joint may be connected by a screw, or other joints such as a tie rod may be used. The connection may be made by a material.

[0006] The applicant has confirmed through testing and analysis that the battery module 400' is Since the cross beams are fixed to the cross beams 500' or 600' in the longitudinal direction, no space is required. In addition, the weight increases due to the increased number of connecting members such as screws, and the energy density The battery module 400' is a combination of end beams and side beams. The end beams and side beams are designed to have a certain thickness and height. Therefore, the space inside the pack body 200'' is wasted, and the volume utilization of the pack body 200'' is reduced. In general, the battery pack 10 in the above-mentioned conventional technology has a low charging rate. ' is the ratio of the sum of the volumes of the cells in the pack body 200'' to the volume of the pack body 200'' However, both are around 50%, and even lower at 40%.

[0007] According to the battery pack 10' according to the above-mentioned conventional technology, the battery module 400 The end beams, side beams, and internal connection and mounting methods of the battery pack will all be This also reduces the utilization rate of the internal space of the pack body 200'', resulting in a decrease in the The ratio of the total volume of the cells to the volume of the pack body 200'' is too low, and the energy The density of electric vehicles cannot meet the user demand for the driving range of electric vehicles, which is This has become a major factor limiting the development of automobiles. The assembly process is complicated, so first assemble the battery module, then assemble the battery module into the pack body. This increases labor and material costs and requires multiple assembly steps. The need for a production line increases the probability of defective products being produced during the battery pack assembly process. Multiple assembly attempts may cause the battery pack to become loose and the installation to become weak, This will adversely affect the quality of the battery pack and reduce the stability and reliability of the battery pack.

[0008] The present application seeks to solve at least one of the technical problems in the prior art. The present invention has high space utilization rate, high energy density, long range capability, and high reliability. One of the objectives is to provide a battery pack that has the advantages of being short, low cost, and high quality. The target.

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

[0010] The battery pack according to the first embodiment of the present application includes a pack body and a battery charger provided in the pack body. and a plurality of unit cells arranged in a battery pack, wherein the sum V1 of the volumes of the plurality of unit cells and the The volume V2 satisfies V1 / V2≧55%, and the battery packs are arranged in a first direction perpendicular to each other. and a second direction, and the cell is arranged such that the longitudinal direction is along the first direction of the battery pack. The plurality of single cells are arranged in a second direction of the battery pack. The pack body accommodates only one unit cell along the first direction, and the unit cell is It includes a battery body having a thickness of 600 to 2500 mm.

[0011] In the power battery according to the embodiment of the present application, the ratio of the sum of the volumes of the single cells to the volume of the battery pack, i.e. In other words, by limiting V1 / V2 to 55%, the space utilization rate of the battery pack can be improved. This allows more cells to be placed in a battery pack, i.e., more cells can be placed in a unit space. By arranging the energy supply structure, the energy density is improved and the occupied space is expanded. This allows the vehicle's range to be improved without increasing the size of the battery pack. In this way, the cost is reduced and the quality and reliability of the battery pack is improved.

[0012] The electric vehicle according to the second embodiment of the present application is an electric vehicle according to the first embodiment of the present application. Includes pond pack.

[0013] The electric vehicle according to the embodiment of the present application utilizes the battery pack according to the embodiment of the first aspect of the present application. By using this, it is possible to improve the driving range without increasing the space occupied by the battery. do.

[0014] The energy storage device according to the embodiment of the third aspect of the present application may be the same as the embodiment of the first aspect of the present application. Includes the battery pack described.

[0015] Additional aspects and advantages of the present application are set forth in part in the description that follows and in part in the description that follows. These will become apparent in the description or may be learned by practice of the present application. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is an exploded view of a battery pack according to the prior art. [Diagram 2] 1 is a cross-sectional view of a battery pack according to an embodiment of the present application. [Diagram 3] 1 is a perspective view of a battery pack according to an embodiment of the present application; [Figure 4] FIG. 2 is an exploded view of a battery pack according to an embodiment of the present application. [Diagram 5] FIG. 1 is a schematic diagram of a unit cell according to an embodiment of the present application. [Figure 6] FIG. 2 is a schematic diagram of an arrangement of battery modules in a battery pack according to an embodiment of the present application. [Figure 7] FIG. 4 is a schematic diagram of 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 application; [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. [Figure 12] FIG. 2 is a perspective view of a battery pack according to a first alternative embodiment of the present application. [Figure 13] FIG. 2 is a perspective view of a battery pack according to a second alternative embodiment of the present application. [Figure 14] FIG. 13 is a perspective view of a battery pack according to a third alternative embodiment of the present application. [Figure 15] FIG. 13 is a perspective view of a battery pack according to a fourth alternative embodiment of the present application. [Figure 16] FIG. 13 is a perspective view of a battery pack according to a fifth alternative embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the present embodiments, examples of which are illustrated in the drawings and referenced throughout. The same or similar reference numbers 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 are not intended to be limiting of the present application. These are merely illustrative and should not be construed as limiting the present application.

[0018] In the description of this application, the terms "vertical direction", "horizontal direction", "length", "width", and "thickness" are used interchangeably. The directions or positional relationships indicated by "," "inside," "outside," etc. are based on the directions or positional relationships shown in the drawings. The above is merely for ease of explanation and simplification of the present application, and the devices shown are 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 imply that isn't it.

[0019] Also, in the present description, "plurality" means two or more.

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

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

[0022] As shown in FIGS. 2 to 16, the battery pack 10 according to the embodiment of the present application includes a pack body 200. and a plurality of single cells 100.

[0023] The plurality of unit cells 100 are provided in a pack body 200. The pack body 200 is It can be understood as a case that houses the battery 100, for example, a tray 210 and an upper The tray 210 and the top cover 220 together hold the plurality of cells 10 The storage space is defined by a tray 210, and the plurality of cells 100 are mounted on the tray 210, and the upper cover The sum V1 of the volumes of the plurality of cells 100 and the volume of the battery pack 10 are covered by 220. V2 satisfies V1 / V2≧55%.

[0024] 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. V1 is the total volume of the cells 100, and V2 is the battery pack volume. The total volume of the three-dimensional shape defined by the outer contour of block 10.

[0025] According to the battery pack 10 of the embodiment of the present application, the sum of the volume V1 of the cells 100 and the volume V2 of the battery pack By limiting the ratio of the volume of the battery pack 10 to the volume V2, i.e., V1 / V2 ≧ 55%, The space utilization rate of the battery pack 10 can be improved, and more single cells 1 can be accommodated in the battery pack 10. 00, that is, by placing more energy supply structures in a unit space, This will increase the energy density and improve the range without increasing the space occupied. At the same time, the cost of assembling the battery pack can be reduced and the quality and power can be improved. The battery pack according to the present invention has a pack body that is The battery includes only one cell along a first direction, the cell having a length of 600-2500 mm. The battery pack includes a battery body having a diameter of 1 mm and disposed along a first direction and a second direction. The cells are arranged in a battery pack along the direction of the battery pack, and the volume utilization rate is 55% or more. By forming a battery pack, the space utilization rate is improved, and the energy density and the battery pack This will improve the range of electric vehicles that use hybrid vehicles.

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

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

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

[0029] As can be seen, V2 is the overall three-dimensional shape defined by the outer periphery of the battery pack 10. The volume of the battery pack 10 is the volume including the internal space of the battery pack 10. The volume of the three-dimensional area enclosed in space by the outer periphery of the body 10. In an electric vehicle, V 1 / V2 can be understood as the space utilization rate.

[0030] As will be appreciated by those skilled in the art, several factors may affect the performance of the device, for example, the surrounding components. , anti-collision space at the bottom of the tray, liquid cooling system, heat preservation material, insulating protection material, thermal safety auxiliary parts The pack body 200 occupies an internal space including a fire exhaust passage, a high-voltage power distribution module, etc. Therefore, the peak value of V1 / V2 is generally 80%, i.e., V1 / V2≦80%. be.

[0031] Hereinafter, with reference to the drawings, the battery pack 10 according to specific embodiments of the present application will be described. The battery pack 10 has a longitudinal direction indicated by arrow A, a width direction indicated by arrow B, and a height direction indicated by arrow C. In some specific embodiments of the present application, as shown in FIGS. 2 to 4, the single battery 100 is arranged such that its longitudinal direction is along the width direction B of the battery pack 10. A plurality of single batteries 100 are arranged along the longitudinal direction A of the battery pack 10, which helps the V1 / V2 of the battery pack 10 to reach 55%, 60%, 62%, 65% or more. At the same time, to reserve sufficient space for attaching other electronic components (such as the battery management system BMS), generally the space utilization rate of the battery pack 10 is set to 85% or less. Shown.

[0032] In some specific embodiments of the present application, as shown in FIGS. 2 to 4, the single battery 100 is arranged such that its longitudinal direction is along the width direction B of the battery pack 10, and a plurality of single batteries 100 are arranged along the longitudinal direction A of the battery pack 10, which helps the V1 / V2 of the battery pack 10 to reach 55%, 60%, 62%, 65% or more. At the same time, to reserve sufficient space for attaching other electronic components (such as the battery management system BMS), generally the space utilization rate of the battery pack 10 is set to 85% or less. of the battery pack 10 to reach 55%, 60%, 62%, 65% or more, and at the same time, to reserve sufficient space for attaching other electronic components (such as the battery management system BMS), generally the space utilization rate of the battery pack 10 is set to 85% or less. reach 55%, 60%, 62%, 65% or more, and at the same time, to reserve sufficient space for attaching other electronic components (such as the battery management system BMS), generally the space utilization rate of the battery pack 10 is set to 85% or less. 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 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 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 L of the single battery 100 satisfies L1 + L2 < L. In this way, in the width direction B of the 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 battery pack 10. That is, in the width direction B of the battery pack 10, the single battery 100 is not arranged in two or more rows.

[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 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 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 L of the single battery 100 satisfies L1 + L2 < L. In this way, in the width direction B of the battery pack 10, another additional single battery 100 cannot be accommodated. In the width direction B of the 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 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 L of the single battery 100 satisfies L1 + L2 < L. In this way, in the width direction B of the battery pack 10, another additional single battery 100 cannot be accommodated. In the width direction B of the 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 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 L of the single battery 100 satisfies L1 + L2 < L. In this way, in the width direction B of the battery pack 10, another additional single battery 100 cannot be accommodated. 1, 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 L of the single battery 100 satisfies L1 + L2 < L. In this way, in the width direction B of the battery pack 10, another additional single battery 100 cannot be accommodated. In the width direction B of the 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 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 L of the single battery 100 satisfies L1 + L2 < L. In this way, in the width direction B of the battery pack 10, another additional single battery 100 cannot be accommodated. In the width direction B of the 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 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 L of the single battery 100 satisfies L1 + L2 < L. In this way, in the width direction B of the battery pack 10, another additional single battery 100 cannot be accommodated. In the width direction B of the 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 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 L of the single battery 100 satisfies L1 + L2 < L. In this way, in the width direction B of the 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 battery pack 10. That is, in the width direction B of the battery pack 10, the single battery 100 is not arranged in two or more rows.

[0034] In other words, the pack body 200 accommodates only one single battery 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 battery 100 is not arranged in two or more rows. In other words, the pack body 200 accommodates only one single battery 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 battery 100 is not arranged in two or more rows. In the battery pack 10, the number of cells 100 or more cannot be arranged in the direction. When at least two layers are provided along the height direction C of the battery pack 10, at least one layer Only one unit cell 100 can be accommodated in the width direction B of the battery pack 10. The battery pack 10 includes only one battery 100 in the width direction B. 100 can be arranged in parallel, and two layers can be arranged in the height direction C of the battery pack 10. However, it is possible to arrange one or more unit cells 100 in the width direction B of the battery pack 10. Not at all.

[0035] As can be seen, in the width direction B of the battery pack 10, both sides of the pack body 200 are The battery pack 10 is a battery pack body 200 having end beams at both ends in the longitudinal direction A of the battery pack 10. It is.

[0036] In some embodiments of the present application, as shown in FIG. 3 and FIG. 4, the length of the cell 100 is The battery pack 10 extends in the entire width direction B, i.e., the battery pack 10 extends in the width direction B. The battery 100 extends from one side of the pack body 200 to the other side, and the length of the cell 100 is the same as that of the battery pack. The battery pack 10 is filled in the width direction B of the battery pack 10, and the pack body 200 is divided into two parts in the width direction B of the battery pack 10. In this case, two or more unit cells 100 cannot be arranged, and both ends of the unit cell 100 in the longitudinal direction are The pack body 200 is fitted to both side walls facing each other in the width direction B of the pack body 200, and fixed to the pack body 200, for example. As a result, the width direction cross beam and the length direction cross beam can be formed inside the pack body 200. No directional cross beam is required, and the intermediate beam can be directly connected to the single cell 100. This greatly simplifies the structure of the pack body 200 and reduces the space occupied by the intermediate beam and By reducing the space occupied by the mounting structure of the single battery 100, the space utilization rate is improved. , improving cruising capability.

[0037] Of course, the embodiment of the present application includes a transverse cross beam and a longitudinal cross beam. In some embodiments of the present application, as shown in FIG. A cross beam 500 can be provided in the main body 200. 500 extends along the width direction B of the battery pack 10, and the plurality of single cells 100 are are arranged along the longitudinal direction A to form a battery array, and the width-direction cross beam 500 is The battery array is divided into at least two parts along the longitudinal direction A of the battery pack 10, Each part includes at least one cell 100 and one battery module 400. Configure.

[0038] Of course, in some other embodiments of the present application, as shown in FIG. A longitudinal cross beam 600 may be provided within the frame body 200. The battery pack 10 includes a battery 600 extending in a longitudinal direction A of the battery pack 10, and the battery 100 extends in a longitudinal direction A of the battery pack 10. The cells 100 are arranged along the width direction B of the battery pack 10. The battery array is formed by arranging the battery packs in the pack body 200 along the hand direction A. At least two rows of battery arrays are arranged along the width direction B of the battery pack 10, and each row of the battery arrays is The battery pack 10 includes a plurality of unit cells 100 arranged along a longitudinal direction A thereof, and the longitudinal cross section The beam 600 is positioned between two adjacent rows of battery arrays.

[0039] In some specific examples of the present application, the pack body 200 is The battery 100 includes side beams located on both sides, and both ends of the battery 100 in the longitudinal direction are provided with the side beams. The pack body 200 is supported by the end caps located at both ends of the battery pack 10 in the longitudinal direction A. The end beams are pressed inwardly against the adjacent cells 100. Provide pressure.

[0040] As shown in FIG. 3 and FIG. 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, The two end beams 204 are connected in series to form a first side beam 201 and a second side beam 202. The beams 202 face each other in the width direction B of the battery pack 10, and the first end beam 203 and the second end beam 204 face each other in the width direction B of the battery pack 10. The end beam 204 faces the longitudinal direction A of the battery pack 10. The first and second side beams 202 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 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 are supported by the end beam 202. 4 provides a pressing force on both sides of the thickness of the cell 100, i.e., the first end beam 20 3 is a second end beam 203 attached to the unit cell 100 adjacent to the first end beam 203. 204, the second end beam 204 applies a force to the second end beam 204 A force is applied to the unit cell 100 adjacent to the first end beam 203 toward the first end beam 203. As a result, the plurality of single cells 100 are arranged in the first end along the longitudinal direction A of the battery pack 10. The first end beam 203 and the second end beam 204 are closely arranged and bonded to each other. In addition, the first end beam 203 and the second end beam 204 are The positions of the plurality of unit cells 100 can be regulated in the longitudinal direction A of the pack 10. The slight expansion of the battery 100 provides a cushioning and inward pressure to the battery cell 100. This prevents the battery 100 from expanding or deforming too much. do.

[0041] In some embodiments of the present application, as shown in FIG. 7, the cell 100 has a longitudinal direction that is a The cells 100 are arranged along the width direction B of the battery pack 10. The battery packs 1 are arranged in the pack body 200 along the longitudinal direction A to form a battery array. The battery array includes at least two layers along the height direction C of the battery pack 100. By optimizing the number of It is easy to realize integration of BIC and low voltage samplers.

[0042] In some specific embodiments of the present application, as shown in FIG. 15 and FIG. 16, 00 is arranged so that its longitudinal direction is aligned with the longitudinal direction A of the battery pack 10, and multiple single cells 1 00 are arranged along the width direction B of the battery pack 10, It helps to set utilization rates at 55%, 60%, 62%, 65% or higher.

[0043] In some embodiments of the present application, as shown in FIG. 15 and FIG. 16, In the longitudinal direction A, the distance between the cell 100 and the end wall of the pack body 200 is the length of the cell 100. Specifically, in the longitudinal direction A of the battery pack 10, one end of the unit cell 100 and The closest distance between the end beam of the pack body 200 adjacent to the one end (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 L of the single battery 100 satisfies L3 + L4 < L. Thus, in the longitudinal direction A of the 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 longitudinal direction A of the battery pack 10. That is, in the longitudinal direction A of the battery pack 10, the single battery 100 cannot be arranged in two or more numbers in that direction. 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. In some specific examples of the present application, as shown in FIGS. 15 and 16, the length of the single battery 100 extends throughout the longitudinal direction A of the battery pack 10. That is, along the longitudinal direction A of the battery pack 10, the single battery 100 extends from one end to the other end of the pack body 200. The length of the single battery 100 is filled in the longitudinal direction A of the battery pack 10, and two or more single batteries 100 cannot be arranged in the longitudinal direction A of the pack body 200. Both ends in the longitudinal direction of the single battery 100 are fitted to both end walls facing each other in the longitudinal direction A of the pack body 200 and can be fixed to the pack body 200, for example. Thereby, a width-direction cross beam and a longitudinal-direction cross beam are not required inside the pack body 200, and directly, by the connected single batteries 100

[0044] 換言すれば、パック本体200は、電池パック10の長手方向Aに、1つの単電池10 0のみを収容する。すなわち、電池パック10の長手方向Aに、単電池100は、2つ又 は2つ以上の数で該方向に配置することができない。

[0045] 理解できるように、電池パック10の幅方向Bに、パック本体200の両側は、サイド ビームであり、電池パック10の長手方向Aに、パック本体200の両端は、エンドビー ムである。

[0046] 本願のいくつかの具体例において、図15及び図16に示すように、単電池100の長 さは電池パック10の長手方向A全体に延び、すなわち電池パック10の長手方向Aに沿 って、単電池100はパック本体200の一端から他端まで延び、単電池100の長さは 電池パック10の長手方向Aに充填され、パック本体200には電池パック10の長手方 向Aに2つ又は2つ以上の単電池100を配置することができず、単電池100の長手方 向の両端はパック本体200の長手方向Aに対向する両端壁に嵌合し、例えば、パック本 体200に固定することができる。これにより、パック本体200の内部に幅方向クロス ビーム及び長手方向クロスビームを必要とせず、直接的に、接続された単電池100によ​ This serves as an intermediate beam, greatly simplifying the structure of the pack body 200 and reducing the occupancy of the intermediate beam. By reducing the space required for mounting the battery 100 and the space required for mounting the battery 100, the space can be effectively utilized. Improve utilization rate and range.

[0047] Of course, the embodiment of the present application does not include the lateral and widthwise cross beams. In some embodiments of the present application, but not limited to, a pack body 200 as shown in FIG. A longitudinal cross beam 600 may be provided within the longitudinal cross beam 600. The battery pack 10 has a longitudinal direction A and a width direction B of the battery pack 10. B to form a battery array, and the longitudinal cross beam 600 is connected to the battery array A is divided into at least two parts along the width direction B of the battery pack 10, and each part of the battery array is , which includes at least one cell 100 and constitutes one battery module 400.

[0048] Of course, in some other embodiments of the present application, the width of the pack body 200 may be A cross beam 500 may be provided in the width direction. The cross beam 500 may extend through the battery pack 10. The length of the battery pack 10 is parallel to the length direction A of the battery pack 10. The cells 100 are arranged in the width direction B of the battery pack 10. A battery array is formed, and the battery pack 10 is arranged at least in the longitudinal direction A of the battery pack 10 in the pack body 200. In each of the battery packs 10, two rows of battery arrays are arranged, and each row of the battery arrays is arranged along the width direction B of the battery pack 10. The cross beam 500 is a cross beam that connects two adjacent rows of cells. Located between ponds alley.

[0049] In some embodiments of the present application, the pack body 200 is The battery 100 includes end beams located at both ends of the battery 100, and both ends of the battery 100 in the longitudinal direction are The pack body 200 is supported by the support frame, and the pack body 200 is provided with two sides located on both sides in the width direction B of the battery pack 10. The side beams are pressed inwardly against the adjacent cells 100. Provide pressure.

[0050] As shown in FIG. 16, the pack body 200 includes a first side beam 201, a second side The first end beam 202, the first end beam 203 and the second end beam 204. Side beam 201, second side beam 202, first end beam 203, second end The end beam 204 is connected in series with the first side beam 201 and the second side beam 202 are opposed to each other in the width direction B of the battery pack 10, and a first end beam 203 and a second end The beam 204 faces the longitudinal direction A of the battery pack 10. The second end beams 204 provide support to both longitudinal ends of the cell 100, i.e. One end of the cell 100 is supported by a first end beam 203, and the other end is supported by a second end beam 204. The first side beam 201 and the second side beam 202 are supported by a single The first side beam 201 provides a pressing force on both sides of the thickness of the battery 100. The second side beam 202 is provided adjacent to the first side beam 201 of the cell 100. 202 is applied with a force toward the second side beam 202 adjacent to the second side beam 202. Applying a force toward the first side beam 201 to the unit cell 100 provided in such a manner as to As a result, the plurality of single cells 100 are arranged along the width direction B of the battery pack 10 by the first side beams. 201 and the second side beam 202 are closely arranged and can be attached to each other. In addition, the first side beam 201 and the second side beam 202 are In particular, the positions of the plurality of unit cells 100 can be restricted in the width direction B of the sheet. When it expands slightly, it acts to provide a cushioning and inward pressure on the cell 100. Moreover, it is possible to prevent the expansion and deformation of the unit cells 100 from becoming too large.

[0051] In some embodiments of the present application, as shown in FIG. 15, the cell 100 has a longitudinal direction The plurality of cells 100 are arranged along the longitudinal direction A of the battery pack 10. The battery array is formed by arranging the battery cells along the width direction B of the battery pack 200. At least one layer of the battery array is included along the height direction C of the battery 10. By optimizing the number of 0s, the space utilization rate is improved, and the energy density is increased. In addition, it is easy to integrate BIC and low-voltage samplers.

[0052] In some specific embodiments of the present application, a plurality of cells 100 are arranged in a battery module. The battery pack 10 can be assembled into a battery module 400. 6 , the battery pack 10 may be arranged along the width direction B of the battery pack 10. 15, the battery pack 10 may be arranged in a height direction C of the battery pack 10. A layered structure may be formed (as shown in FIG. 7 ), in other words, the cell 100 may be a part of the battery pack 10. A plurality of unit cells, whether extending along a width direction B or along a longitudinal direction A 100 can be arranged in multiple layers along the height direction C of the battery pack 10. Of course, the battery modules 400 are arranged in the longitudinal direction A and the height direction of the battery pack 10. The battery pack 10 may be arranged in the width direction B and the height direction C at the same time, or may be arranged in the width direction B and the height direction C at the same time. The battery modules 400 may be arranged simultaneously along the direction C. This optimizes the number of battery modules 400. This improves the space utilization rate, increases the energy density, and reduces the BIC and It is easy to realize integration of the voltage sampler. It should be understood that the battery in the embodiment of the present application The module 400 does not have structures such as end beams and side beams. .

[0053] 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 parallel to each other. Since the two side walls of the pack body 200'' cannot be fitted to each other, The longitudinal cross beams 600' and / or the transverse cross beams 500' are disposed within the rack body 200''. 00' (as shown in FIG. 1), thus facilitating the assembly of the unit cell. When the battery is mounted in the pack body 200'' by the battery module 400', the battery There are a plurality of unit cells along the width direction of the pack 10', that is, the unit cells are arranged opposite each other. The two longitudinal cross beams 600 do not extend between the two side walls and are provided opposite each other. ' or widthwise cross beams 500', and the battery modules are adjacently connected by fasteners. It is fixed to the longitudinal cross beams 600' and / or the transverse cross beams 500'.

[0054] In the prior art, longitudinal cross beams 600' and / or A transverse cross beam 500' is provided, and a longitudinal cross beam 600' and / or a transverse cross beam 600' are provided. The cross beam 500' is a mass mounting structure for accommodating the cells in the pack body 200''. Since the pack body 200 '' occupies a large space, the space utilization rate of the pack body 200 '' is low, and generally, the volume of the single cell is and the volume of the pack body 200 ″ is about 40%, which is even lower, i.e. In the conventional technology, only about 40% of the space in the pack body 200 ″ for mounting the unit cells is occupied. Therefore, the number of cells that can be accommodated in the pack body 200'' is limited, and the entire battery pack 10'' The battery capacity and voltage are limited, and the range of the battery pack 10' is low.

[0055] The battery pack 10 according to the embodiment of the present application has a longitudinal cross beam and and / or reduce the use of transverse cross beams and further reduce the use of longitudinal cross beams within the pack body 200. Loss beams and / or widthwise cross beams may not be installed, thus The cross beams and / or widthwise cross beams occupy less space within the pack body 200. In addition, the space utilization rate of the pack body 200 is improved, while the end Reduced use of end beams and side beams, with end beams and side beams integrated into the pack body The space occupied by the pack body 200 can be reduced, and the space utilization rate of the pack body 200 can be improved. It is possible to arrange as many single cells 100 as possible in the pack body 200, and further, Improve the capacity, voltage and range of the entire battery pack.

[0056] In addition, a longitudinal cross beam and / or a widthwise cross beam are arranged in the pack body 200. Since there is no need to place the battery pack 200 in the battery pack 20, the manufacturing process of the battery pack 200 is simplified, and the assembly of the battery pack 200 is simplified. The complexity of the assembly and the production cost are reduced, while the pack body 200 and the battery pack 10 This reduces the overall weight of the battery pack 10. When installed in an automobile, it can improve the driving range of an electric vehicle and reduce the weight of the electric vehicle. It can also be realized.

[0057] In addition, the single battery 100 itself is used to reinforce the structural strength of the pack body 200, In other words, it is necessary to further provide a reinforcing structure within the pack body 200 to reinforce its structural strength. Instead of a reinforcing structure, the structural strength of the pack body 200 is ensured by the single cell 100 itself, This can ensure 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 single cell. 100, and supports the single cell 100 and the battery pack 10 The overall load-bearing capacity can be improved, and the length of the cells 100 is In addition, the surface area of ​​the single cell 100 is increased, so that the single cell The heat dissipation area of ​​the battery 100 is increased, the heat dissipation rate of the battery 100 is improved, and the battery pack This improves 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 (small parts such as tabs). The volume V of the battery body 110 includes the battery body 110 and the protruding structure of a certain size. and the energy E of the battery body 110 is V / E≦2000mm 3 ·Wh -1 This satisfies This not only ensures a sufficient heat dissipation area to ensure the heat dissipation effect, but also reduces the volume of the single cell 100. The ratio of the cells 100 can be reduced, and the arrangement of the cells 100 in the battery pack 10 can be made compact. It helps to

[0059] In some specific embodiments of the present application, as shown in FIG. 9 and FIG. The main body 200 is different from the case of the assembled battery disclosed in the Chinese patent document CN107925028A. In particular, in terms of size and load support, the pack body 200 is adapted to engage with the vehicle body / chassis. 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 an independently manufactured, single This is a tray for storing and mounting 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. It is suspended from the chassis of the electric vehicle to perform the functions of storage and load support.

[0060] The battery pack 10 is used as a battery pack for use in a vehicle to supply electrical energy. In this case, the length of the battery cell 100 is aligned along the length of the vehicle body, i.e., along the front-rear direction of the vehicle. In this case, the length L of the battery body 110 of the single cell 100 is 4 In some embodiments, the length of the cell 100 may be 00 mm to 2500 mm. The length L may be 400 to 1500 so as to match the length of the vehicle. When the 100 is used as a battery pack to supply electrical energy to a vehicle, The pond 100 is arranged so that its longitudinal direction is along the width direction of the vehicle body, i.e., along the left-right direction of the vehicle. In this case, the length of the cell 100 can be adjusted to fit the width of the vehicle. The length L of the battery body 110 may be 400 to 1500 mm. In the example, the length L of the battery body is 700 mm to 2500 mm, and further, 800 mm The length may be from 1 to 1500 mm.

[0061] 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 into the vehicle, i.e. the pack body 200 may be mounted in any suitable The pack body 200 is a device for mounting the battery cell 100. It may be formed on the chassis of an electric vehicle.

[0062] In some exemplary embodiments of the present application, the battery pack 10 is disposed in an electric vehicle. In this case, unlike the battery pack disclosed in the Chinese patent document CN107925028A, 10 further includes a battery management system (BMS), a battery connector, a battery sampler, and a battery thermal A battery pack including at least one of the components required for a vehicle battery, such as a management system. 10, the width direction B is along the width direction of the vehicle body, that is, the left-right direction of the vehicle, and the longitudinal direction is The vehicle body is disposed in the longitudinal direction, i.e., along the front-rear direction of the vehicle. The present application is not limited to this, and the width direction B of the battery pack 10 is aligned along the longitudinal direction of the vehicle body. The longitudinal direction A may be arranged along the width direction of the vehicle body. In the above, the first direction and the second direction are two directions perpendicular to each other with respect to the battery pack. The first direction may be a width direction of the battery pack, and the second direction may be a width direction of the battery pack. The direction may be the longitudinal direction.

[0063] As will be understood by those skilled in the art, the orientation and placement of the cells 100 within the battery pack 10 The orientation of the battery pack 10 in the electric vehicle may be combined in different ways, for example: For example, the cell 100 may be arranged so that the longitudinal direction is aligned with the width direction B of the battery pack 10. Alternatively, the longitudinal direction may be aligned with the longitudinal direction A of the battery pack 10. 10 may be disposed so that the width direction B is along the width direction of the vehicle body, and the width direction B is along the longitudinal direction of the vehicle body. For example, the battery pack 10 may be arranged so that the width direction B is parallel to the vehicle Regardless of whether the cells are arranged along the width of the vehicle body or along the length of the vehicle body, The battery cells 100 are arranged so that their longitudinal directions are aligned with the width direction of the vehicle body. The relative arrangement direction of the pond pack 10 and the vehicle body can be set according to the actual application. Different requirements can be met.

[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. The unit of pressure is torr (mm), and the unit of surface area S is square millimeters (mm 2 ) and the volume V is The unit is cubic millimeters (mm 3 ) and the unit of energy E is the watt-hour (Wh) It is.

[0066] As shown in FIG. 5, the cell 100 according to the embodiment of the present application includes a battery body 110. The body 110 can be understood as the 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.

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

[0068] In the development of electric vehicles, the requirements for the voltage plateau of the single battery are given. Therefore, the volume of the cell becomes a constant value, i.e., 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 product is constant. By designing the ratio, the battery body 110 can be reasonably flattened with a constant volume. The overall arrangement in the battery pack (for example, the arrangement of the battery pack 10 according to the above embodiment of the present application) This helps improve the space utilization rate of the battery pack and The energy density has been increased, and the driving range of the battery pack has been improved, while the Ensure that the heat dissipation area is large enough to transfer the internal heat to the outside in a timely manner. By preventing heat from accumulating inside, it is compatible with high energy density and can extend cruising range. It can help improve skills.

[0069] In some specific embodiments of the present application, the arrangement of the cells 100 in the battery pack is optimized. In order to optimize the length L and thickness D of the battery body 110 and improve the heat dissipation capacity of the battery 100, In some embodiments, L / D=23 to 208 is satisfied. In some embodiments, L / D=23 to 200 is satisfied. In another specific embodiment of the present application, the length L and thickness D of the battery body 110 are L / D=50~120.

[0070] In some specific embodiments of the present application, as shown in FIG. 5, the battery body 110 includes: The outer surface of the electrode is smooth and rectangular so as to have a certain structural strength. The body is placed inside a rectangular battery case, the opening of the battery case is sealed with a cover plate, and electrolyte is injected. Compared with the battery using the aluminum-plastic composite membrane, the battery 100 according to the embodiment of the present application has a thermal It has high conductivity and can be combined with conventional battery thermal management structures to solve the heat dissipation problems caused by large-sized structures. Compared with cylindrical batteries, it has a higher space utilization rate and is easier to manufacture. The construction and assembly process is simpler.

[0071] The cell 100 according to the embodiment of the present application is disposed in the pack body 200 of the battery pack 10. In this case, the length direction and thickness direction of the battery body 110 can extend along the horizontal direction. The width direction of the battery body 110 can extend along the vertical direction, that is, the cell 100 can be The battery pack 10 is arranged vertically, and both the horizontal and vertical directions are used. (e.g. when applied to electric vehicles)

[0072] In some embodiments of the present application, the arrangement of the cells 100 in the battery pack 10 is optimized. By doing so, the energy density is improved, and the cruising capability is improved. The battery body 110 is arranged compactly in a limited space, concentrating energy more. In order to achieve this, other parameters of the cell 100 are designed.

[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 , L / V=0.0005mm -2 ~0.002mm -2 and some of the practical applications of the present application. In the embodiment, the width H of the battery body 110 and the volume V of the battery body 110 are expressed as H / V=0.000. 1mm -2 ~0.00015mm -2 In some embodiments of the present application, the battery The thickness D of the main body 110 and the volume V of the battery main body 110 are D / V=0.0000065 mm -2 ~0.00002mm -2 For a battery body 110 of a certain volume, the length L and width By designing the ratio of each of H and thickness D to volume V, the energy of a unit quantity can be calculated. The spatial distribution of the particles can be optimized, and thus the arrangement within the pack body 200 can be optimized. Helpful.

[0074] In some embodiments of the present application, the length L of the battery body 110 and the surface area of ​​the battery body 110 S is L / S=0.002mm -1 ~0.005mm -1 and some of the practical applications of the present application. In the embodiment, the length L of the battery body 110 and the energy E of the battery body 110 are expressed as L / E=0. .8mm·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 L / E=1.65 mm. ·Wh -1 ~2.45mm·Wh -1 As a result, the cell 100 is In this way, the battery pack This improves the driving range of the battery 10 while improving the structural strength and heat dissipation effect of the battery 100.

[0075] 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=0.1~0.35mm -1This 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 a large number of 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 In this way, the heat dissipation from the surface of the single cell 100 is sufficient, and the power When the battery uses ternary or high-nickel ternary positive electrode materials, the heat inside the battery is This can ensure that the battery is electrically conductive, which is beneficial to the safety of the battery. The cell 100 is a rectangular cell with a smooth outer surface, has a certain structural strength, and is a metal thermal conductor. It has better performance and is easier to process and assemble later compared to batteries that have increased surface area due to corrugation. The difficulty of standing is small.

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

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

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

[0080] 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 inversion 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.

[0081] As will be appreciated by those skilled in the art, the provision of the explosion-proof valve 103 reduces the It can be applied not only to batteries but also to pouch batteries. Also, the explosion-proof valve 103 is It may be provided at a location other than the end of 100.

[0082] 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.

[0083] 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 at the first end of the first side beam 201. A passage 222 is provided to connect the explosion-proof valve 103 of each cell 100 of the first side beam 201. An intake port 221 is provided at each of the corresponding positions, 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 a second side beam 202, An exhaust passage 222 is provided inside the first side beam 202, and an exhaust passage 222 is provided inside the second side beam 202. An air intake 221 is provided at each of the positions of the battery cells 100 corresponding to the explosion-proof valves 103. The exhaust port 221 is connected to an exhaust passage 222, and the pack body 200 has an exhaust port 222 connected to the exhaust passage 222. Vents are provided.

[0084] In the prior art, if the internal air pressure of a single cell rises to a certain level during use, The explosion vent opens, and the flames, smoke, or gases inside the cell are released through the explosion vent, causing the battery pack If these particles gather inside the battery and cannot be discharged 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 is provided with an intake port 221 corresponding to the explosion-proof valve 103 of the single battery 100, and the first An exhaust passage 222 is provided inside the side beam 201 and / or the second side beam 202. Therefore, when the air pressure inside the cell 100 rises, the explosion-proof valve 103 opens, and Flames, smoke, gas, etc. of the part pass directly through the intake port 221 and reach the first side beam 201 and and / or into the exhaust passage 222 in the second side beam 202 and through the exhaust hole The exhaust gas is discharged from the first side beam 201 and / or the second side beam 202, for example, through an exhaust port. Thus, the flame, smoke or gas is discharged into the atmosphere through the inside of the pack body 200. The flame, smoke or gas may not be concentrated in the battery 100 and may cause secondary damage to the battery 100. Avoid.

[0085] In addition, one end of each of the plurality of single cells 100 is connected to the first side beam 20. The exhaust is exhausted through an exhaust passage 222 in the first side beam 201, and the other end is exhausted through an exhaust passage 222 in the second side beam 202. 22, and thus both ends of the cell 100 are vented by different passages. Increasing the air distance and creating cross exhaust can reduce temperatures.

[0086] Hereinafter, an electric vehicle 1 according to an embodiment of the present application will be described with reference to the drawings. Commercial and special vehicles that require battery packs to provide electrical energy to drive. , electric vehicles such as electric bicycles, electric motorcycles, and electric scooters.

[0087] As shown in FIGS. 9 and 10, an electric vehicle 1 according to the embodiment of the present application is The battery pack 10 according to the present invention may be integrally formed in an electric vehicle. Alternatively, it may be an independently manufactured vehicle tray that houses and mounts the cells 100. stomach.

[0088] The electric vehicle 1 according to the embodiment of the present application uses the battery pack 10 according to the above embodiment of the present application. This makes it possible to improve the vehicle's range without increasing the space required for the battery.

[0089] In some specific embodiments of the present application, as shown in FIG. 9 and FIG. 10, a battery pack 10 is provided at the bottom of the electric vehicle 1, and the pack body 200 is fixed to the chassis of the electric vehicle 1. Since the mounting space on the chassis of the electric vehicle 1 is large, the battery pack 10 is By providing the battery on the chassis of the electric vehicle 1, the number of the single cells 100 can be increased as much as possible. The driving range of the electric vehicle 1 can be improved.

[0090] In some embodiments of the present application, as shown in FIG. 9 and FIG. 10, the electric vehicle 1 includes: The battery pack 10 is provided at the bottom of the electric vehicle 1, and the pack body 200 is The battery pack 10 is fixedly connected to the chassis of the electric vehicle 1, and its width direction is the width direction of the body of the electric vehicle 1. That is, the electric vehicle 1 is arranged in the left-right direction and the longitudinal direction is the length of the body of the electric vehicle 1. In other embodiments, the electric vehicle 1 is disposed along the front-rear direction. The electric vehicle 1 may include a plurality of battery packs 10 provided at the bottom of the electric vehicle 1. The shape and size of the battery packs 10 may be the same or different. The pack 10 is adjustable according to the shape and dimensions of the chassis of the electric vehicle 1 and includes a plurality of The battery packs 10 are arranged in the longitudinal direction of the vehicle body, that is, in the front-rear direction.

[0091] 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 In another embodiment of the present application, the width direction of the battery pack satisfies 0%≦F / W≦80%. The length L of the battery body and the width W of the vehicle body satisfy the relationship 46%≦L / W≦76%. In this case, only one pack body 200 is provided along the width direction of the vehicle body. When there are a plurality of pack bodies 200, the plurality of pack bodies 200 are arranged in the longitudinal direction of the vehicle body. Generally, for multiple vehicles, the width W of the vehicle body is 500 mm to 2000mm, for example 500mm, 1600mm, 1800mm, 2000mm, The length of the vehicle is 500mm to 5000mm, and the width of the vehicle is generally The width is 500mm to 1800mm, and the length of the vehicle is 500mm to 4000mm.

[0092] In some other embodiments of the present application, the width F of the pack body 200 is 500 mm to 15 00mm, which is smaller than the battery case disclosed in the Chinese patent document CN107925028A. It is much larger than the battery module 400 of the battery pack such as CN107925028A. It helps with storage, ensures range and fits into the vehicle dimensions.

[0093] 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 This can be achieved by providing a battery module 400 or a plurality of single cells 100. In some embodiments, the length L of the battery body 110 is 400 mm to 1500 mm. .

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

[0095] The energy storage device according to the embodiment of the third aspect of the present application may be the same as the embodiment of the first aspect of the present application. Includes the battery pack described.

[0096] The present invention will be described below with reference to Comparative Example 1, Examples 1 to 3, Comparative Example 2, and Examples 4 to 5. The battery pack 10 according to the embodiment is designed by designing the arrangement and dimensional parameters of the cells 100. This leads to improvements in terms of energy density, etc.

[0097] The following examples and comparative examples all take 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 213L, and its pack body 200' and the internal battery management system and other power distribution modules The total volume of the battery pack 10' is 58 L. The volume that can accommodate the transverse and longitudinal cross beams is 155 L, and the electric The volume of the box is 22.5 L, the length of the pack body 200 is 1380 mm, The width is 1005mm and the thickness is 137mm. The total volume of the battery pack is 213L=1 380×1005×137×0.000001+22.5. Comparative Example 1

[0099] In a conventional battery pack 10', as shown in FIG. There are two transverse cross beams 500' and one longitudinal cross beam 600' in the The two transverse cross beams 500' and one longitudinal cross beam 600' are The single cells are divided into six assembled batteries 400', and each assembled battery 400' is in a battery case. has. EXAMPLES

[0100] 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 cells 100 is aligned with the width direction B of the battery pack. The pack body 200 is arranged along the longitudinal direction A of the battery pack 10, and the pack body 200 is arranged along the width direction B of the battery pack. The pack body 200 contains two single cells 100. The pack body 200 contains one width-direction cross beam 500. and one longitudinal cross beam 600 is provided, and the widthwise cross beam 500 is The battery pack 10 includes a plurality of unit cells 100 arranged in a longitudinal direction B of the battery pack 10. A cross beam 500 supports the battery array. The battery pack 10 is divided into two parts along the longitudinal direction A. The battery pack 10 is divided into two rows of the cells 100. The battery array is arranged along the width direction B of the battery pack, and the longitudinal cross beam 600 is The battery pack 10 is located between two adjacent rows of the battery arrays. The first side beam 201 and the second side beam 202 located on both sides of the direction B are single-pole The battery pack 100 is supported by a support rod 201 and is located at both ends of the battery pack 10 in the longitudinal direction A of the pack body 200. The first end beam 203 and the second end beam 204 are disposed so as to support the adjacent cells 10. 0 provides an inward pressing force along the height direction C of the battery pack 10 within the pack body 200. The battery pack 10 includes a battery array (also called a battery module). It will be understood that the end beams and side beams are not provided. EXAMPLES

[0101] In the battery pack 10 according to the embodiment of the present application, as shown in FIG. 13, the single cell 100 is The longitudinal direction of the cells 100 is aligned with the width direction B of the battery pack. The pack body 200 is arranged along the longitudinal direction A of the battery pack 10. The battery pack 10 includes a single cell 100 housed in a space B, and the single cell 100 is packed in the width direction B of the battery pack 10. It extends from one side of the body 200 to the other. One widthwise cross beam within the pack body 200 500 is provided, the longitudinal cross beam 600 is not provided, and the widthwise cross beam The battery pack 10 includes a plurality of unit cells 100. The battery pack 10 includes a plurality of unit cells 100. The unit cells 100 are arranged in a width direction B of the battery pack 10. The first reinforcing rib 500 is arranged along the longitudinal direction A of the battery 10 to form a battery array. The battery array is divided into two parts along the longitudinal direction A of the battery pack 10. A first side beam 201 and a second side beam 202 are disposed on both sides of the battery pack 10 in the width direction B. The beam 202 provides support to the battery cell 100 and supports the battery pack 10 of the pack body 200. The first end beam 203 and the second end beam 204 located at both ends in the longitudinal direction A are , providing an inward pressing force to the adjacent cells 100. The battery pack 10 includes a battery array layer along the height direction C. (also understood as battery module) is not provided with end beams and side beams . EXAMPLES

[0102] In the battery pack 10 according to the embodiment of the present application, as shown in FIG. 14, the unit cell 100 is The longitudinal direction of the cells 100 is aligned with the width direction B of the battery pack. The pack body 200 is arranged along the longitudinal direction A of the battery pack 10. The battery pack 10 includes a single cell 100 housed in a space B, and the single cell 100 is packed in the width direction B of the battery pack 10. The cross beam 500 extends from one side of the main body 200 to the other side. The battery pack 10 of the pack body 200 is not provided with a longitudinal cross beam 600. The first side beam 201 and the second side beam 202 located on both sides in the width direction B of , which provides a supporting force to the single battery 100 and supports the battery pack 10 in both longitudinal directions A of the pack body 200. The first end beam 203 and the second end beam 204 located at the ends are adjacent single-pole The battery pack 100 is provided with an inward pressing force in the height direction of the battery pack 10 within the pack body 200. The battery pack 10 includes a battery array (battery module) along the length of the battery module 10. The axial length of the stern (also understood as a stern) is not provided with end beams and 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, In comparison with the battery pack 10′ in the embodiment, the battery pack 10 in the embodiment of the present application has a single cell 100. Through the design of the arrangement, dimensional parameters and other factors, the space utilization rate is reduced beyond the limitations of traditional battery packs. This can break through limitations and achieve higher energy densities.

[0104] In Comparative Example 2, Example 4, and Example 5, the battery pack 10' has a total volume of 283 L. The pack body 200' and the internal battery management system and other power distribution modules are The total volume is 89 L, and the remaining cells and / or longitudinal sections of the battery pack 10' are The volume that can accommodate the directional cross beam and the widthwise cross beam is 221L, and the pack Body 200'' is 1380mm long, 1380mm wide and 137mm thick. m, and the cell is 215 mm long, 118 mm wide and 13.5 mm high. mm. The volume of the electrical box is 11 L, and the total volume of the battery pack is 310 L = 15 80 x 1380 x 137 x 0.000001 + 11. Comparative Example 2

[0105] In a conventional battery pack 10', as shown in FIG. There are two transverse cross beams 500' and one longitudinal cross beam 600' in the The two transverse cross beams 500' and one longitudinal cross beam 600' are The single cell is divided into six battery modules 400', and each battery module 400' has also has side beams and end beams. EXAMPLES

[0106] In the battery pack 10 according to the embodiment of the present application, as shown in FIG. The battery pack is arranged such that the battery pack length direction is along the longitudinal direction A of the battery pack. The pack body 200 is arranged along the width direction B of the battery pack 10. The battery pack 10 includes a battery cell 100 housed in the battery pack A, and the battery cell 100 is arranged in the battery pack 10 in the longitudinal direction A. The pack body 200 includes a longitudinal cross-section extending from one side to the other side of the pack body 200. The cross beam 600 is provided, the width direction cross beam 500 is not provided, and the longitudinal direction cross beam 600 is provided. The beam 600 extends along the longitudinal direction A of the battery pack 10, and the plurality of single cells 100 The battery pack 10 is arranged along the width direction B to form a battery array, and a longitudinal cross beam 600 divides the battery array into two parts along the width direction B of the battery pack 10. First end beams 203 and 204 located at both ends of the battery pack 10 in the longitudinal direction A of the battery pack 10 in FIG. The second end beam 204 provides support to the cells 100 and supports the battery pack 200 of the pack body 200. A first side beam 201 and a second side beam 202 are positioned on both sides of the width direction B of the rack 10. 202 provides an inward pressing force to the adjacent cells 100. The battery pack 10 includes a battery array in one layer along the height direction C. The battery array (also understood as a battery module) is provided with end beams and side beams. Not yet. EXAMPLES

[0107] In the battery pack 10 according to the embodiment of the present application, as shown in FIG. 16, the single cell 100 is The longitudinal direction of the battery pack is aligned along the longitudinal direction A of the battery pack. The pack body 200 is arranged along the width direction B of the battery pack 10. The battery pack 10 includes a battery cell 100 housed in a longitudinal direction A. The battery cell 100 is arranged in a longitudinal direction A of the battery pack 10. The cross beam 50 extends from one side of the pack body 200 to the other side. 0 and the longitudinal cross beam 600 are not provided. The first end beam 203 and the second end beam 204 are located at both ends of the longitudinal direction A of the 04 provides a supporting force to the single cell 100 and is arranged in the width direction B of the battery pack 10 of the pack body 200 The first side beam 201 and the second side beam 202 located on both sides of the Provides an inward pressing force to the single cell 100. The height of the battery pack 10 within the pack body 200 The battery pack 10 includes a battery array having one layer arranged along the direction C. The axially extending beam (also understood as a axially extending beam module) is not provided with end beams and side beams.

[0108] In Comparative Example 3 and Example 6, the battery pack 10' has a total volume of 414 L. The total volume occupied by the pack body 200' and the internal battery management system and other power distribution modules 58L, and the remaining battery pack 10' is the unit cell and / or the longitudinal cross section. The volume that can accommodate the beam and the cross beam in the width direction is 356 L, and the pack body 200' ' has a length of 2130mm, a width of 1380mm and a thickness of 137mm, The volume of the electrical box is 11L, and the total volume of the battery pack is 414L = 2130 x 138 It is 0×137×0.000001+11. Comparative Example 3

[0109] The arrangement of the unit cells was the same as that in Comparative Example 1. EXAMPLES

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

[0111] In this embodiment, the battery pack 10' has a total volume of 508 L. The total volume of the 00', the internal battery management system and other power distribution modules is 119L. The actual remaining cells and / or longitudinal cross beams of the battery pack 10' The volume that can accommodate the widthwise cross beam is 389 L, and the pack body 200 ″ is The length is 2630mm, the width is 1380mm, the thickness is 137mm, and the electrical box The volume of the battery pack is 11L, and the total volume of the battery pack is 414L = 2630 x 1380 x 137 × 0.000001 + 11. The arrangement of the cells in the battery pack is the same as in Example 5. This is the same as the array method used in

[0112] Specific parameters of Examples 1 to 7 and Comparative Examples 1 to 3 are shown in Table 1. The total volume of the unit cell was: The volume of the battery pack is the sum of the volumes of the individual cells. The volume of the battery pack is determined by the outer casing of the battery pack. The total volume of the three-dimensional shape of the battery pack, i.e., the three-dimensional area enclosed in space by the outer casing of the battery pack. The volume of the cell storage chamber is the volume of the storage space defined in the pack body. is the volume of.

[0113] [Table 1]

[0114] As will be understood by those skilled in the art by comparing the above Comparative Examples and Examples, The battery pack 10 is space-efficient, depending on the design of the cell 100 arrangement, dimensional parameters, and other factors. The utilization rate can break through the limitations of conventional battery packs, achieving higher energy density This improvement in energy density can be achieved by increasing the overall volume of the battery pack. That is, the larger the volume of the battery pack, the more the technical method of the embodiment of the present application The effect of improving the energy density by the steps becomes significant.

[0115] In the description of this specification, descriptions referring to the terms "specific examples", "specific examples", etc. The specific features, structures, materials or characteristics described in the embodiments or 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. The exemplary expressions are not necessarily limited to the same embodiment or example.

[0116] Although embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that the principles and Various changes, modifications, substitutions and variations may be made to these embodiments without departing from the spirit of the invention. The scope of the present application is limited only 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', transverse cross beam 500' In this application, Electric vehicle 1, battery pack 10, single cell 100, battery body 110, pack body 200, Tray 210, top cover 220, first side beam 201, second side beam 20 2, first end beam 203, second end beam 204, exhaust passage 222, intake port 2 twenty one, Battery module 400, first tab 101, second tab 102, explosion-proof valve 103, longitudinal direction Cross beam 600, widthwise cross beam 500, longitudinal direction A of battery pack 10, The width direction B of the battery pack 10, the height direction C of the battery power pack 10, the length L of the battery body 110, Width H of main body 110, thickness D of battery main body 110, width W of vehicle body, width F of pack main body 200.

Claims

1. The pack body, A battery pack including 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 width and length directions perpendicular to each other, the length direction of a battery cell is arranged along the width direction of the battery pack, the battery cells are arranged along the length direction of the battery pack, the pack body contains only one battery cell along the width direction, and the battery cell includes a battery body having a length of 600 to 2500 mm; the pack body includes side beams located on both sides of the battery pack in a width direction and end beams located on both ends of the battery pack in a longitudinal direction, and both ends of the battery pack in the longitudinal direction are supported by the side beams.

2. 2. The battery pack according to claim 1, wherein in a width direction of the battery pack, a closest distance between one end of the unit cell and an adjacent side beam of the pack body is L1, a closest distance between the other end of the unit cell and an adjacent side beam of the pack body is L2, and a length L of the unit cell satisfies L1 + L2 < L.

3. The battery pack according to claim 1 , wherein the unit cells extend from one side to the other side of the pack body in a width direction of the battery pack.

4. 4. The battery pack according to claim 1, wherein at least one widthwise cross beam extending along a width direction of the battery pack is provided within the pack body, the plurality of unit cells are arranged along a 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.

5. 4. The battery pack according to claim 1, wherein the longitudinal direction of the battery cell is arranged along a 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, and the battery pack body includes at least two layers of battery arrays along a height direction of the battery pack.

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

7. 6. The battery pack according to claim 1, wherein a width F of the pack body in a width direction of the battery pack is 600 mm to 1500 mm.

8. The battery pack according to any one of claims 1 to 5, wherein the pack body is formed in an electric vehicle.

9. 9. The battery pack according to claim 1, wherein the single cell includes 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.

10. The battery pack according to any one of claims 1 to 8, characterized in that the single battery includes a battery body, and a length L of the battery body and a thickness D of the battery body satisfy L / D = 23 to 208.

11. 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 The battery pack according to any one of claims 1 to 5, characterized in that:

12. 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 The battery pack according to any one of claims 1 to 8, characterized in that:

13. 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 The battery pack according to any one of claims 1 to 8, characterized in that:

14. 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 The battery pack according to any one of claims 1 to 8, characterized in that:

15. 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 The battery pack according to any one of claims 1 to 8, characterized in that:

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

17. The battery pack according to claim 16, wherein the single cell includes a battery body having a length L of 800 mm to 1500 mm.

Images