Single cells, power battery packs, and electric vehicles

Abstract

To provide: a single cell which has a high heat dissipation ability and facilitates the overall arrangement in a power battery pack to improve the space utilization of the power battery pack and increase the energy density of the power battery pack, thereby further enhancing the cruising ability of the power battery pack; a power battery pack having the single cell; and an electric vehicle having the power battery pack.SOLUTION: A single cell includes a cell body. The cell body has a length L, a width H, and a thickness D. The length L of the cell body is greater than the width H, the width H of the cell body is greater than the thickness D, the length L of the cell body is greater than 600 mm, and the length L and the width H of the cell body satisfy L / H=4-21.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] (Cross-reference of related applications) This application was filed by BYD Company Limited on January 9, 2019. Chinese patent applications "201910021244.0" and "201910020967.9" , "201910021246.X", "201910021248.9", "2019 Claiming priority rights to patents "10021247.4" and "201910020925.5" Therefore, all of its contents shall be incorporated into this application by reference.

[0002] This application relates to the technology of batteries, and more specifically to a single cell, and a power battery pack having the single cell. This invention relates to an electric vehicle having a battery pack and the aforementioned power battery pack. [Background technology]

[0003] In conventional technology, for example, power battery packs applied to electric vehicles are mainly, pack The main unit and multiple battery modules, each consisting of multiple single batteries, are installed inside the pack unit. This includes the range. User demands for the range of electric vehicles are gradually increasing. Therefore, if the space at the bottom of the vehicle body is limited, conventional power battery packs are used. If this occurs, the utilization rate of the internal space will decrease, and the energy density of the power battery pack will not meet the demand. This inability to do so is becoming a significant factor limiting the development of electric vehicles. [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] In related conventional technologies, the dimensions of a single cell are large in order to limit the internal resistance and overcurrent of the battery. It is not designed to be easy to use; the individual cells are assembled into a battery module, and then the battery module is placed in the battery tray. When placed in a battery pack, the dimensions of the single battery are small, the length is short, and the opposing ends of the single battery are inside the battery pack. Because it cannot be fitted into the two opposing side beams, it cannot be fitted into the housing device. It is necessary to provide a cross beam 500' and / or a side beam 600' (shown in Figure 1). Thus, the assembly of individual cells becomes easier.

[0005] As shown in Figure 1, the pack body 200'' of the power battery pack 10' is located on the crossbeam 5 The 00 and side beam 600 divide the area into mounting regions for multiple battery modules 400'. Often, the battery module 400' is attached to the crossbeam 500' by screws, etc. Alternatively, it is fixed to the side beam 600'. The battery module 400' is arranged in a series of multiple It contains several single cells, and multiple single cells are arranged to form a battery array, and the outside of the battery array End plates and / or side plates are provided, and generally, the end plates and side plates are included together, and the end plates and side plates are , it is fixed and surrounds the space that houses the battery array. At the same time, the end plate and side plate are fixed to the battery array To achieve stability, they are connected by screws or by other connecting members such as tie rods. It will be connected.

[0006] The applicant found through testing and analysis that the battery module 400' was cloned due to its structure, such as screws. Because it is fixed to the 500' beam or 600' side beam, space is wasted, and In addition, the weight increases due to the increase in connecting members such as screws, and the battery module 400 ' is designed by combining end plates and side plates, and both the end plates and side plates have a certain thickness and height Because of this, the internal space of the pack body 200'' is wasted, and the pack body 200'' found that the volume utilization rate thereof is low. In general, in the above prior art, the power battery pack 10’ has a ratio of the sum of the volumes of the single cells in the pack body 200’’ and the volume of the pack body 200’ ’ both being about 50%, and even as low as 40%.

[0007] The battery pack 10’ according to the embodiment of the above prior art has the end plates, side plates of the adopted battery module 400’, and the internal connection and mounting forms of the power battery pack 10’, etc., all of which reduce the utilization rate of the internal space of the pack body 200’’, and as a result, in the power battery pack 10’, the ratio of the sum of the volumes of the single cells and the volume of the pack body 200’’ is too low, and its energy density cannot meet the user's demand for the cruising ability of the electric vehicle.

[0008] This application aims to solve at least one of the technical problems in the prior art. Therefore, this application provides a single cell that has high heat dissipation capacity and is useful for the overall arrangement in the power battery pack, improves the space utilization rate of the power battery pack, expands the energy density of the power battery pack, and further improves the cruising ability of the power battery pack as one of the objectives.

[0009] This application further provides a power battery pack having the above single cell.

[0010] This application further provides an electric vehicle having the above power battery pack.

[0011] The single cell according to the embodiment of the first aspect of this application includes a battery body, the battery body having a length L, width H and 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, the length L of the battery body being > 600 mm, and the length L of the battery body The width H satisfies L / H = 4 to 21.

[0012] The single cell according to the embodiment of the present invention has high heat dissipation capacity and an overall arrangement within the power battery pack. This helps improve the space utilization rate of the power battery pack and the energy density of the power battery pack. It will be enlarged, and the range of the power battery pack will be further improved.

[0013] A power battery pack according to an embodiment of the second aspect of the present application comprises a pack body and inside the pack body The invention includes a plurality of single cells described in the embodiment of the first aspect of the present application, provided in the same location.

[0014] The power battery pack according to the embodiment of the present application utilizes the single cell described in the embodiment of the first aspect of the present application. By using it, it is possible to achieve high space utilization, high energy density, and high cruising range, etc. It has advantages.

[0015] An electric vehicle according to an embodiment of the third aspect of the present application is the same as the electric vehicle according to an embodiment of the second aspect of the present application. Includes a power battery pack.

[0016] The electric vehicle according to the embodiment of the present application is power battery pack as described in the embodiment of the second aspect of the present application. By utilizing this technology, it is possible to improve cruising range without increasing the space occupied by the battery. can.

[0017] Additional aspects and advantages of the present application are, in part, shown in the following description and in part, described below. This will become clear or will be ascertained through the implementation of this application. [Brief explanation of the drawing]

[0018] [Figure 1] This is an exploded view of a conventional power battery pack. [Figure 2] This is a cross-sectional view of a power battery pack according to an embodiment of the present application. [Figure 3] This is a perspective view of a power battery pack according to an embodiment of the present invention. [Figure 4] This is an exploded view of a power battery pack according to an embodiment of the present invention. [Figure 5] This is a schematic diagram of the single cell according to an embodiment of the present invention. [Figure 6] This is a schematic diagram of the arrangement of battery modules in a power battery pack according to an embodiment of the present invention. [Figure 7] This is a schematic diagram of the battery module arrangement method of a power battery pack according to another embodiment of the present invention. [Figure 8] This is a schematic diagram showing the pack body of a power battery pack according to an embodiment of the present invention, formed in an electric vehicle. [Figure 9] This is a schematic diagram of an electric vehicle according to an embodiment of the present invention. [Figure 10] This is an exploded view of an electric vehicle according to an embodiment of the present invention. [Figure 11] Figure 2 is an enlarged view of region G. [Figure 12] This is a perspective view of a power battery pack according to the first alternative embodiment of the present application. [Figure 13] This is a perspective view of a power battery pack according to a second alternative embodiment of the present application. [Figure 14] This is a perspective view of a power battery pack according to a third alternative embodiment of the present application. [Figure 15] This is a perspective view of a power battery pack according to a fourth alternative embodiment of the present application. [Figure 16] This is a perspective view of a power battery pack according to a fifth alternative embodiment of the present application. [Modes for carrying out the invention]

[0019] The embodiments of this application will be described in detail below, and examples of the above embodiments are shown in the drawings, and throughout this text... One or a similar code indicates the same or similar part, or has the same or similar function. The parts are shown. The embodiments described below with reference to the drawings are illustrative and do not necessarily reflect the present invention. It is merely an explanation and should not be understood as limiting the original vow.

[0020] In the description of this application, the terms "vertical direction," "horizontal direction," "length," "width," and "thickness" are used. The directions or positional relationships indicated by "inside," "outside," etc., are based on the directions or positional relationships shown in the drawing. This is merely a means to easily explain the present invention and simplify the explanation, and the shown device Alternatively, the components must have a specific orientation and must be configured and operate in that specific orientation. This does not indicate or suggest that the present application is limited; therefore, it should be understood as limiting the present application. isn't it.

[0021] Furthermore, in the description of this application, "multiple" means two or more.

[0022] Considering the current state of conventional power battery packs, this invention aims to provide a battery pack with high space utilization efficiency and energy A power battery pack having advantages such as high energy density and long cruising range, and a device having the same. We provide electric vehicles.

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

[0024] As shown in Figures 2 to 16, the power battery pack 10 according to the embodiment of the present invention has a pack body 2 It includes 00 and multiple single cells 100.

[0025] Multiple single batteries 100 are housed inside the pack body 200, and the pack body 200 contains multiple single It can be understood as a case for housing the battery 100, for example, the tray 210 and the top The tray 210 and the upper cover 220 may include a cover 220, and both the tray 210 and the upper cover 220 contain multiple single batteries 10 The storage space for 0 is defined, and multiple single batteries 100 are provided in the tray 210, and the upper cover Covered by 220. The sum of the volumes of multiple single cells 100, V1 and the power battery pack 10. The volume V2 satisfies the condition V1 / V2 ≥ 55%.

[0026] As a person skilled in the art will understand, V1 is the volume of each cell 100 and the number of cells 100 V2 is the product of the two, and V2 is the total volume of the three-dimensional shape defined by the outer casing of the power battery pack 10. This is the volume including the internal space of the power battery pack 10, that is, the power battery pack It is the volume of a three-dimensional region enclosed in space by 10 outer boundaries. In electric vehicles, V1 / V2 is defined as the space utilization rate.

[0027] The power battery pack 10 according to the embodiment of the present application is the sum of the volumes of the single cells 100 and the power battery pack By limiting the ratio of volume to 10, i.e., V1 / V2 ≥ 55%, the power battery pack 1 To improve the space utilization rate of 0, more single cells 100 can be placed inside the power battery pack 10. In other words, in order to place more energy supply structures within a unit space, the energy density By improving this, it is possible to increase the range without increasing the occupied space.

[0028] In some embodiments of this application, V1 / V2 ≥ 60%.

[0029] In some embodiments of this application, V1 / V2 ≥ 62%.

[0030] In some embodiments of this application, V1 / V2 ≥ 65%.

[0031] As anyone skilled in the art will understand, due to the influence of several factors, for example, the bottom of the tray Collision prevention space of the part, liquid cooling system, heat preservation material, insulation protection material, thermal safety auxiliary parts, flame discharge Peripheral components including an exhaust passage, a high-voltage power distribution module, etc. occupy the internal space of the pack body 200, so the maximum value of V1 / V2 is generally 80%, that is, V1 / V2 ≤ 80% is true.

[0032] Hereinafter, referring to the drawings, the power battery pack 10 according to specific embodiments of the present application will be described. The longitudinal direction of the power battery pack 10 is indicated by arrow A, the width direction is indicated by arrow B, and the height direction is indicated by arrow C.

[0033] In some specific embodiments of the present application, as shown in FIGS. 2 to 4, the single battery 100 is arranged such that the longitudinal direction is along the width direction B of the power battery pack 10, and a plurality of single batteries 100 are arranged along the longitudinal direction A of the power battery pack 10, which helps to set the space utilization rate of the power battery pack 10 to 55%, 60%, 62%, 65% or more.

[0034] 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 shortest distance between one end of the single battery 100 and the side beam of the pack body 200 adjacent to it (the above one end of the single battery 100) is L1, and the shortest distance between the other end of the single battery 100 and the side beam of the pack body 200 adjacent to it (the above other end of the single battery 100) is L2, and the length L0 of the single battery 100 satisfies L3 + L4 < L0. In this way, in the width direction B of the power battery pack 10, another additional single battery 100 cannot be accommodated. L0 is such that L3 + L4 < L0. In this way, in the width direction B of the power battery pack 10, another additional single battery 100 cannot be accommodated. In this way, in the width direction B of the power battery pack 10, another additional single battery 100 cannot be accommodated.

[0035] In other words, the pack body 200 has one single cell in the width direction B of the power battery pack 10 It accommodates only 00. That is, in the width direction B of the power battery pack 10, the single cell 100 is 2 They cannot be arranged in pairs or in groups of two or more.

[0036] To make it easier to understand, in the width direction B of the power battery pack 10, both sides of the pack body 200 are It is an id beam, and both ends of the pack body 200 are in the longitudinal direction A of the power battery pack 10. It's a beam.

[0037] In some specific examples of this application, as shown in Figures 3 and 4, the length of the single cell 100 is , extending across the entire width B of the power battery pack 10, that is, the width of the power battery pack 10 Along direction B, the single cell 100 extends from one side to the other of the pack body 200, and the single cell 1 The length of 00 is filled in the width direction B of the power battery pack 10, and the pack body 200 is power Two or more single batteries 100 can be arranged in the width direction B of the battery pack 10. The ends of the 100-cell battery in the longitudinal direction are on the side walls facing the width B of the pack body 200. It can be fitted and, for example, fixed to the pack body 200. 00 does not require crossbeams or sidebeams inside, and is directly connected to a single cell. 100 acts as a reinforcing rib, significantly simplifying the structure of the pack body 200, and also provides support. By reducing the space occupied by the strong ribs and the space occupied by the mounting structure of the single cell 100, This improves space utilization and enhances flight range.

[0038] Naturally, the embodiment of this application does not include a cross beam and side beams. In some embodiments of this application, as shown in Figure 13, the pack body 200 A crossbeam 500 can be installed inside, and the crossbeam 500 is powered by a battery pack 1 Extending along the width direction B of 0, multiple single cells 100 are located in the longitudinal direction A of the power battery pack 10. Arranged along the crossbeam 500 to form a battery array, the battery array is powered by The battery pack 10 is divided into at least two parts along its longitudinal direction A, and each part of the battery array is small It includes at least one single cell 100 and constitutes one battery module 400.

[0039] Naturally, in some other embodiments of the present invention, as shown in Figure 12, Side beams 600 may be provided within the main body 200, and the side beams 600 are power The single cell 100 extends along the longitudinal direction A of the battery pack 10, and the longitudinal direction of the power battery pack Arranged along the width direction B of 10, multiple single cells 100 are located along the length of the power battery pack 10. Arranged along direction A to form a battery array, and power battery packs are located within the pack body 200. At least two rows of battery arrays are arranged along the width direction B of the box 10, and each row of battery arrays It includes a plurality of power cells 100 arranged along the longitudinal direction A of the power battery pack 10. The side beam 600 is located between two adjacent rows of battery arrays.

[0040] Furthermore, the crossbeam and side beam are used in relation to other structural components such as protective partitions and insulating cotton. It can be replaced with a material, and in this application, it is not limited to, that is, in this application, battery The battery array in the pack may be integrated, and may be a crossbeam and / or sidebeam. Alternatively, it may be divided into multiple sub-battery arrays by other spacers, for example, one, two It may be divided into three or four sub-battery arrays.

[0041] In some specific examples of the present invention, the pack body 200 is in the width direction of the power battery pack 10. Including side beams located on both sides of B, the longitudinal ends of the single cell 100 are the same as the side Supported by a beam, the pack body 200 is positioned at both ends of the longitudinal direction A of the power battery pack 10. It includes an end beam, and the end beam is located inside the adjacent single cell 100. Provides directional pressing force.

[0042] As shown in Figures 3 and 4, the pack body 200 consists of a first side beam 201, a second side beam It has side beams 202, a first end beam 203 and a second end beam 204, First side beam 201, second side beam 202, first end beam 203, The two end beams 204 are sequentially tail-connected to the first side beam 201 and the second side beam 204. The dove beam 202 is opposite the power battery pack 10 in the width direction B, and the first end beam 203 The second end beam 204 faces the longitudinal direction A of the power battery pack 10. The side beam 201 and the second side beam 202 support the single cell 100 at both ends in the longitudinal direction. To provide support, that is, one end of the single cell 100 is supported by the first side beam 201, The other end is supported by the second side beam 202. The first end beam 203 and the second The end beam 204 provides pressing force to both sides of the cell 100 in the thickness direction, i.e., The first end beam 203 is connected to a single cell 1 provided adjacent to the first end beam 203. A force is applied to 00 toward the second end beam 204, and the second end beam 204 The first end beam 2 is connected to a single cell 100 located adjacent to the second end beam 204. By applying a force toward 03, the multiple single cells 100 are connected to the power battery pack 10. A tight connection is made between the first end beam 203 and the second end beam 204 along the longitudinal direction A. They are densely arranged and can be bonded to each other. Also, the first end beam 203 The second end beam 204 has multiple single cells 10 in the longitudinal direction A of the power battery pack 10 0 can be positioned, and in particular, if cell 100 swells slightly, cell 100 In contrast, it acts as a buffer, providing inward pressure, and the expansion amount and change of the single cell 100 This prevents the shape from becoming too large.

[0043] In some specific examples of the present invention, as shown in Figure 7, the single cell 100 is movable in the longitudinal direction. Arranged along the width direction B of the power battery pack 10, multiple single cells 100 are connected to the power battery pack The batteries are arranged along the longitudinal direction A of the pack 10 to form a battery array, and move within the pack body 200. The power battery pack 10 includes at least two battery arrays along the height direction C. By optimizing the number of single cells (100), the space utilization rate is improved and the energy density is increased. It improves performance and facilitates the integration of BICs and low-voltage samplers.

[0044] In some specific embodiments of the present invention, as shown in Figures 15 and 16, a single cell 1 00 is arranged such that its longitudinal direction is aligned with the longitudinal direction A of the power battery pack 10, and consists of multiple single batteries The pond 100 is arranged along the width direction B of the power battery pack 10, thereby the power battery pack The space utilization rate of CK10 will be set to 55%, 60%, 62%, 65%, or higher. Useful.

[0045] In some specific examples of the present application, as shown in FIGS. 15 and 16, the power battery pack 1 0 in the longitudinal direction A, the distance between the single cell 100 and the end wall of the pack body 200 is less than the length of the single cell 10 0. Specifically, in the longitudinal direction A of the power battery pack 10, one end of the single cell 100 and the end beam of the pack body 200 adjacent to it (the above-mentioned one end of the single cell 100) The closest distance between them is L3, and the other end of the single cell 100 and it (the above-mentioned other end of the single cell 100) The closest distance between the adjacent end beams of the pack body 200 is L4, and the length L0 of the single cell 100 satisfies L3 + L4 < L0. Thus, in the longitudinal direction A of the power battery pack 10, another additional single cell 100 cannot be accommodated.

[0046] In other words, the pack body 200 accommodates only one single cell 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 cell 100 cannot be arranged in numbers of two or more.

[0047] 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. <00(00370>

[0048] In some specific examples of the present application, as shown in FIGS. 15 and 16, the length of the single cell 100 extends across the entire longitudinal direction A of the power battery pack 10, that is, along the longitudinal direction A of the power battery pack 1 0, the single cell 100 extends from one end to the other end of the pack body 200, the length of the single cell 100 is filled in the longitudinal direction A of the power battery pack 10, and the pack body 200 ​​This involves arranging two or more single cells 100 in the longitudinal direction A of the power battery pack 10. It is not possible, and both ends of the single cell 100 in the longitudinal direction are relative to the longitudinal direction A of the pack body 200. It can be fitted into the walls at both ends and, for example, fixed to the pack body 200. The pack body 200 does not require crossbeams or side beams inside, and is directly connected. The connected single cell 100 acts as a reinforcing rib, significantly simplifying the structure of the pack body 200. The design is simplified, and the space occupied by the reinforcing ribs and the mounting structure for the single cell 100 is reduced. By doing so, the space utilization rate is improved, and the flight range is enhanced.

[0049] Naturally, the embodiment of this application does not include side beams and cross beams. In some embodiments of this application, as shown in Figure 15, the pack body 200 A side beam 600 can be installed inside, and the side beam 600 is. Power battery pack 1 Extending along the longitudinal direction A of 0, multiple single cells 100 are located in the width direction B of the power battery pack 10. The side beams 600 are arranged along the side beams to form a battery array, and the battery array is powered by the side beams 600. The battery pack 10 is divided into at least two parts along the width direction B, and each part of the battery array is at least It includes at least one single cell 100 and constitutes one battery module 400.

[0050] Naturally, in several other embodiments of this application, chrome is contained within the pack body 200. A crossbeam 500 may be provided, and the crossbeam 500 is located on the width side of the power battery pack 10. Extending along direction B, the single cell 100 has its longitudinal direction aligned with the longitudinal direction A of the power battery pack 10. Arranged in such a manner, multiple single batteries 100 are arranged along the width direction B of the power battery pack 10. The battery array is formed, and the power battery pack 10 is located within the pack body 200 along the longitudinal direction A. At least two rows of battery arrays are arranged, and each row of battery arrays is a power battery pack 10 The crossbeam 500 includes multiple single cells 100 arranged along the width direction B, and adjacent to each other It is located between two rows of battery arrays.

[0051] Furthermore, the crossbeam and side beam are used in relation to other structural components such as protective partitions and insulating cotton. It can be replaced with a material, and in this application, it is not limited to, that is, in this application, battery The battery array in the pack may be integrated, and may be a crossbeam and / or sidebeam. Alternatively, it may be divided into multiple sub-battery arrays by other spacers, for example, one, two It may be divided into three or four sub-battery arrays. In some specific examples of the present application The pack body 200 consists of end beams located at both ends of the longitudinal direction A of the power battery pack 10. The single cell 100 is supported at both ends in the longitudinal direction by the end beams, and the pack body 2 00 includes side beams located on both sides of the width direction B of the power battery pack 10, and the above side The beam provides an inward pressing force to the adjacent single cell 100.

[0052] As shown in Figure 16, the pack body 200 has a first side beam 201 and a second side It has a beam 202, a first end beam 203 and a second end beam 204, and the first Side beam 201, second side beam 202, first end beam 203, second end The side beam 204 is sequentially connected to the first side beam 201 and the second side beam. Mu 202 is opposite the power battery pack 10 in the width direction B, and the first end beam 203 and the second The end beam 204 faces the longitudinal direction A of the power battery pack 10. Frame 203 and the second end beam 204 provide support to both ends of the single cell 100 in the longitudinal direction. It is provided that, that is, one end of the single cell 100 is supported by the first end beam 203, and the other The ends are supported by the second end beam 204. The first side beam 201 and the second side The beam 202 provides pressing force to both sides of the cell 100 in the thickness direction, i.e., the first The side beam 201 is connected to a single cell 100 located adjacent to the first side beam 201. An action force is applied toward the second side beam 202, and the second side beam 202 is second A single cell 100 is provided adjacent to the side beam 202 of the first side beam 201. By applying a force in the direction of the multiple single cells 100, the width of the power battery pack 10 is They are closely arranged along direction B between the first side beam 201 and the second side beam 202. They are made such that they can be bonded to each other. Also, the first side beam 201 and the second The side beam 202 has multiple single cells 100 in the width direction B of the power battery pack 10. The position can be controlled, and in particular, if the single cell 100 swells slightly, relative to the single cell 100 It plays a role in buffering and providing inward pressure, and the expansion and deformation of the single cell 100 This prevents it from becoming too large.

[0053] In some specific examples of the present invention, as shown in Figure 15, the single cell 100 has a longitudinal direction Arranged along the longitudinal direction A of the power battery pack 10, multiple single cells 100 are powered The batteries are arranged along the width direction B of the battery pack 10 to form a battery array, and inside the pack body 200 The power battery pack 10 includes at least one battery array along the height direction C. By optimizing the number of single cells, the space utilization rate is improved and the energy density is increased. This improves performance and facilitates the integration of BICs and low-voltage samplers.

[0054] In some specific embodiments of the present application, a plurality of single cells 100 are a plurality of battery modules It can be assembled into a 400-unit battery module, and multiple 400-unit battery modules can power a battery pack 1. They may be arranged along the longitudinal direction A of 0 (as shown in Figure 6), and in the width direction of the power battery pack 10. They may also be arranged along B (as shown in Figure 15), along the height direction C of the power battery pack 10 They may be arranged to form a multilayer structure (as shown in Figure 7), in other words, the single cell 100 is powered Whether the power battery pack 10 extends along the width direction B or along the length direction A Furthermore, the multiple single cells 100 are arranged in multiple layers along the height direction C of the power battery pack 10. They can be arranged in a grid. Naturally, multiple battery modules 400 can be used as power battery packs. The power battery pack may be arranged simultaneously along the longitudinal direction A and the height direction C of the 10. The 10 may be arranged simultaneously along the width direction B and the height direction C. This allows the battery module By optimizing the number of 400 units, space utilization efficiency is improved and energy density is increased. It improves performance and facilitates the integration of BICs and low-voltage samplers. What needs to be understood is: In the embodiment of the present invention, the battery module 400 is not provided with structures such as end plates and side plates. That is the case.

[0055] In conventional technology, the dimensions of a single cell are small, the length is short, and the opposing ends of the single cell are... Because it cannot be fitted into the two opposing side walls located within the 200'' body of the lock, The pack body 200'' contains side beams 600'' and / or cross beams 500'' (Figure 1 It is necessary to provide the (as shown) and in this way the assembly of the single cell becomes easier. The single cell is a battery model After being installed inside the pack body 200'' in the form of a 400' joule, the power battery pack 10 Multiple single cells exist along the width direction of ', that is, the single cells are arranged opposite each other in 2 Two side beams 600' or Crosby that do not extend between the two side walls but are positioned opposite each other. The battery module extends between 500' and the adjacent side beam 600' by fasteners. And / or fixed to the crossbeam 500'.

[0056] In conventional technology, the pack body 200'' contains side beams 600'' and / or crossbeams. A beam 500' is provided, and side beams 600' and / or cross beams 500' are provided. Because it occupies a large portion of the mounting space for the single battery inside the 200'' pack body, the pack body The space utilization rate of the 200'' body is low, and generally, the sum of the volumes of the individual cells and the 200'' pack body The ratio to the volume is approximately 40%, and even lower than that, that is, the pack in the conventional technology Because there is only about 40% of the 200'' body space available for installing a single battery, The number of single batteries that can be housed in the 200'' main unit is limited, and the total capacity of the 10'' power battery pack is limited. The voltage is limited, resulting in a low range for the 10' power battery pack.

[0057] The single cell according to the embodiment of the present application includes a battery body, the battery body having a length L, a width H and a thickness The battery body has a length D, and the length L of the battery body is greater than the width H, and the width H of the battery body is greater than the thickness D Furthermore, the length L of the battery body is >600mm, and the length L of the battery body and width H satisfies L / H = 4 to 21, and in some embodiments of the present application, the length of the battery body is The length L and width H satisfy L / H = 9 to 13. The above single cell that satisfies the above dimensional requirements is a power battery. When placed inside pack 10, the side beams and / or cross beams within pack body 200 The use of [unclear] is reduced, and side beams and / or cross beams are provided within the pack body 200. It is not necessary to place them, and in this way the side beams and / or cross beams are packed into the main body 20 This reduces the space occupied within 0 and improves the space utilization rate of the pack body 200, while the battery The use of end plates and side plates within the joule 400 is reduced, and the end plates and side plates occupy space within the pack body 200. This reduces the space required for packing and improves the space utilization rate of the pack body 200. By arranging as many single batteries as possible within the pack body 200, the entire power battery pack To improve the vehicle's capacity, voltage, and range.

[0058] Furthermore, it is not necessary to place the side beams and / or cross beams within the pack body 200. Therefore, the manufacturing process for the 200-cell pack was simplified, and the complexity of assembling the 100 individual batteries was reduced. This reduces production costs, while also reducing the overall weight of the pack body 200 and the power battery pack 10. This reduces the weight and makes the power battery pack 10 lighter. In particular, the power battery pack 10 is electric When installed on a motor vehicle, it improves the range of electric vehicles and reduces their weight. It can also be expressed.

[0059] Furthermore, 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 an additional reinforcing structure within the pack body 200 to reinforce its structural strength. Instead of a reinforcing structure, the 100 individual battery itself ensures the structural strength of the pack body 200, This ensures that the main body 200 is resistant to deformation under external force. (Chinese Patent Document) Compared to the battery pack disclosed in CN107925028A, the pack body 200 has 1 single cell In addition to housing and protecting 00, it also supports single cell 100 and power battery pack 10 The overall load-bearing capacity can be improved, and the length of 100 single batteries is the power battery pack. It provides a reinforcing effect to a strength of 10.

[0060] In some embodiments of this application, the length L and thickness D of the battery body are L / D = 23 By satisfying 208 and increasing the ratio of dimensions within the battery, the surface area of ​​a single cell 100 is increased. This increases the heat dissipation area of ​​the single cell 100, improving the heat dissipation speed of the single cell 100. Furthermore, the overall safety of the power battery pack 10 can be improved, and the power battery pack 10 It becomes safer and more reliable. In some embodiments of the present invention, the length L of the battery body and the thickness D satisfies the condition L / D = 50 to 120.

[0061] In some specific examples of this invention, the single cell 100 is the battery body 110 (small tabs etc.) (This can be understood as the main body part excluding the protruding structure of a certain dimension), and the volume V of the battery body 110. The energy E of the battery unit 110 is V / E ≤ 2000 mm 3 ·Wh -1 This satisfies. This not only ensures sufficient heat dissipation area and thus guarantees heat dissipation effectiveness, but also the volume of 100 single cells. The ratio can be reduced, and the arrangement of multiple single batteries 100 in a power battery pack 10 is efficient. Useful for compacting.

[0062] In some specific embodiments of the present application, as shown in Figures 9 and 10, the pack The main body 200 differs from the battery pack case disclosed in Chinese patent document CN107925028A. In particular, in terms of dimensions and load support, the pack body 200 is related to the vehicle body / car frame. It is connected to the vehicle body in such a way that it forms a structure that houses and supports a single cell 100. It may include a vehicle tray 210, which is manufactured independently. This is a tray for housing and installing the battery 100. The single battery 100 is placed inside the vehicle tray 210. After installation, the vehicle tray 210 can be attached to the vehicle body with fasteners, for example. It is suspended from the chassis of an electric vehicle and serves the function of housing and load support.

[0063] The power battery pack 10 is a power battery pack used in a vehicle to supply electrical energy. When used in this manner, the long side of the 100 AA battery should be aligned with the long side of the vehicle, i.e., the front and rear of the vehicle. They can be arranged to align with the direction, in this case the length of the battery body 110 of the single cell 100. L may be 600mm to 2500mm, and in some embodiments, a single cell 1 L can be between 600mm and 1500mm, so that the length of 00 matches the width of the vehicle. i. Power battery pack 10 is a power battery pack used in a vehicle to supply electrical energy. When used in this way, the longitudinal direction of the single cell 100 should be aligned with the width direction of the vehicle body, i.e., the left and right sides of the vehicle. They can be arranged to align with the direction, and in this case, the length of the single cell 100 matches the width of the vehicle. To enable this, the length L of the battery body 110 of a single 100 cell is 600mm to 2500mm. That's fine.

[0064] In some specific embodiments of the present invention, as shown in Figure 8, the pack body 200 is It may be formed directly on the electric vehicle, that is, the pack body 200 is optional on the electric vehicle. It is a device formed in the appropriate position and for attaching a single cell 100. For example, the pack body 2 00 may be formed on the chassis of an electric vehicle.

[0065] In some specific embodiments of the present invention, the power battery pack 10 is installed in an electric vehicle. In this case, unlike the battery pack disclosed in Chinese Patent Document CN107925028A, the power The IkePack 10 includes a battery management system (BMS), battery connectors, a battery sampler, and batteries. Includes components necessary for a vehicle battery, such as at least one of the thermal management systems, and power battery Pack 10 has a width B that aligns with the width direction of the vehicle body, i.e., the left-right direction of the vehicle, and a longitudinal direction It is positioned along the longitudinal direction of the vehicle body, that is, along the front-to-back direction of the vehicle. Naturally, the present application This is not limited to the above, but also includes the arrangement of the power battery pack 10 such that the width B is aligned with the longitudinal direction of the vehicle body. The longitudinal direction A may be positioned along the width direction of the vehicle body.

[0066] As those skilled in the art will understand, the orientation of the single cell 100 within the power battery pack 10 The orientation of the power battery pack 10 in an electric vehicle can be combined in different ways. For example, the single cell 100 can be arranged so that its longitudinal direction is aligned with the width direction B of the power battery pack 10. They may be positioned such that their longitudinal direction aligns with the longitudinal direction A of the power battery pack 10. The power battery pack 10 may also be arranged such that its width B is aligned with the width of the vehicle body. The width B may be arranged to align with the longitudinal direction of the vehicle body, and furthermore, for example, a power battery Pack 10 is positioned such that its width B is aligned with the width direction of the vehicle body or along the longitudinal direction of the vehicle body. Regardless of how they are positioned, the 100 AA battery's longitudinal direction aligns with the width of the vehicle body. The arrangement is as follows. The relative arrangement direction of the single cell 100, the power battery pack 10, and the vehicle body is as follows: By configuring it according to the application, different requirements can be met.

[0067] A single cell 100 according to an embodiment of the present application will be described below with reference to the drawings.

[0068] In the following specific examples, the units for length L, width H, and thickness D are all millimeters. Tor (mm), and the unit of surface area S is square millimeters (mm 2 ) and volume V The unit is cubic millimeters (mm). 3 ) and the unit of energy E is watt-hour (Wh). That is the case.

[0069] As shown in Figure 5, the single cell 100 according to the embodiment of the present application includes a battery body 110, and the battery The main body 110 can be understood as the main body portion excluding small protruding structures such as tabs. The pond body 110 has a length L, a width H, and a thickness D.

[0070] The length L of the battery body 110 is greater than the width H of the battery body 110. The battery body is larger than the thickness D of the battery body 110, and the length L of the battery body is >600mm. The length L of the pond body 110 and the width H of the battery body 110 satisfy L / H = 4 to 21, and the present invention In several embodiments, the length L of the battery body 110 and the width H of the battery body 110 are L / H = Satisfy 9-13.

[0071] The single cell 100 according to the embodiment of the present invention is designed with a ratio of the length L to the width H of the battery body 110. This allows the battery body 110 to be rationally flattened while maintaining a constant volume, and the power battery Useful for the overall arrangement within the pack (for example, the power battery pack 10 according to the above embodiment of the present application) By achieving this arrangement, the space utilization rate of the power battery pack is improved, and the power battery pack By improving the energy density of the battery, the range of the power battery pack is increased, while the single cell This ensures that the 100 has a sufficiently large heat dissipation area, allowing internal heat to be released to the outside in a timely manner. By conducting heat and preventing it from accumulating inside, it is suitable for high energy densities. This can help improve cruising range.

[0072] In some embodiments of the present invention, the arrangement of single cells 100 within a power battery pack is optimized. Furthermore, in order to improve the heat dissipation capacity of the single cell 100, the length L and thickness D of the battery body 110 are This satisfies L / D = 23 to 208.

[0073] In some specific embodiments of the present invention, as shown in Figure 5, the battery body 110 is The outer surface is constructed in a rectangular parallelepiped shape to have a certain structural strength, for example, as an electrode for a battery. Place the body inside the rectangular battery case, seal the opening of the battery case with the cover plate, and pour in the electrolyte. Compared to a battery made of an aluminum-plastic composite film, the single cell 100 according to the embodiment of the present application has heat It has high conductivity and, when combined with conventional battery thermal management structures, it solves the problem of heat dissipation due to the large size of the structure. The problem can be effectively avoided. Compared to cylindrical batteries, the space utilization rate is higher, and manufacturing The manufacturing and assembly process is simpler.

[0074] The single cell 100 according to the embodiment of the present application is placed inside the pack body 200 of the power battery pack 10. In this case, the battery body 110 has its longitudinal and thickness directions extending horizontally, and its width direction is It can extend along the vertical direction, that is, the single battery 100 is arranged vertically, and the horizontal direction and the vertical direction are both based on the directions when the power battery pack 10 is used (for example, when applied to an electric vehicle ).

[0075] In some specific examples of the present application, the arrangement of the single battery 100 in the power battery pack 10 is optimized to improve the energy density, improve the cruising ability, make the arrangement of the battery body 110 more compact in the limited space of the pack body 200, and concentrate the energy more, so as to design other parameters of the single battery 100.

[0076] According to some embodiments of the present application, the length L of the battery body 110 and the volume V of the battery body 110 satisfy L / V = 0.0005 mm -2 ~0.002 mm -2 ; in some embodiments of the present application, the width H of the battery body 110 and the volume V of the battery body 110 satisfy H / V = 0.000 1 mm ~0.00015 mm -2 ; in some embodiments of the present application, the thickness D of the battery body 110 and the volume V of the battery body 110 satisfy D / V = 0.0000065 mm -2 ~0.00002 mm -2

[0077] [[ID=~0.00015mmIn some embodiments of the present application, the length L of the battery body 110 and the surface area S of the battery body 110 satisfy L / S = 0.002 mm -1~0.005mm -1 It satisfies the requirements and the length of the battery body 110 The energy E of the battery body 110 and the energy L is L / E = 0.8 mm·Wh -1 ~2.45mm ·Wh -1 In some embodiments of the present application, the length L of the battery body 110 and the battery The energy E of the main unit 110 is L / E = 1.65 mm·Wh. -1 ~2.45mm·Wh - 1 This satisfies the condition. As a result, the single cell 100 faces the pack body 200 in its longitudinal direction. This helps to traverse both sides, and thus improves the range of the power battery pack 10. Furthermore, it achieves both the structural strength and heat dissipation effect of a single 100-cell battery.

[0078] In some other examples of this application, the surface area S of the battery body 110 and the volume of the battery body 110 V is S / V = 0.1 mm -1 ~0.35mm -1 This satisfies the requirement. This provides sufficient heat dissipation surface. In addition to guaranteeing the heat dissipation effect by ensuring the product, it also reduces the volume ratio of a single cell 100. This is possible and helps to make the arrangement of multiple single batteries 100 in a power battery pack 10 more compact.

[0079] The surface area S of the battery body 110 and the energy E of the battery body 110 are given by S / E ≤ 1000 mm². 2 ·Wh -1 This satisfies the requirement. Thus, the heat dissipation from the surface of the single cell 100 is sufficient, especially for power When a battery uses a ternary or high-nickel ternary cathode material, the heat inside the battery must be controlled in a timely manner. This can guarantee conductivity and contribute to the safety of the battery. Also, in the embodiments of this application The single cell 100 is a rectangular cell with a smooth outer surface, possesses a certain structural strength, and has metallic thermal conductivity. The process and later assembly are good, and compared to batteries that increase surface area by waveform The difficulty level is low.

[0080] In some specific embodiments of the present invention, as shown in Figure 5, the single cell 100 further , including the first tab 101 and the second tab 102.

[0081] The first tab 101 is provided at one end of the battery body 110 in the longitudinal direction, and the second tab 102 It is provided at the other end in the longitudinal direction of the battery body 110. In other words, the longitudinal direction of the single cell 100 The direction may be the direction of the current inside the single cell 100, that is, the current inside the single cell 100 The direction of flow is as indicated by arrow B. Thus, the direction of the current is along the length of the single cell 100. Because the direction is the same, the effective heat dissipation area of ​​the single cell 100 is larger, resulting in higher heat dissipation efficiency. Here, the first tab 101 is the positive terminal tab of cell 100, and the second tab 102 is It may be the negative electrode tab of cell 100, or the first tab 101 may be the negative electrode tab of cell 100 This is a polarity tab, and the second tab 102 is the positive electrode tab of cell 100.

[0082] In some specific examples of the present invention, as shown in Figure 5, the single cell 100 is connected to the explosion-proof valve 103 It also includes.

[0083] The explosion-proof valve 103 is provided at at least one end of the battery body 110 in the longitudinal direction. When 100 malfunctions and expands, its interior will pierce the inverted sheet inside the explosion-proof valve 103. By maintaining sufficient air pressure, the single cell 100 is short-circuited, ensuring the safety of the single cell 100. This can prevent a single 100-cell battery from exploding.

[0084] As those skilled in the art will understand, the explosion-proof valve 103 is provided in the aluminum case It can be applied not only to batteries but also to pouch batteries, and the explosion-proof valve 103 is the battery body. It may be provided at a location other than the end of 100.

[0085] In some specific embodiments of the present invention, when the single cell is a pouch cell, the battery body The length L and width H satisfy the condition L / H = 7 to 20.

[0086] In some specific embodiments of the present invention, explosion-proof protection is provided at both ends of the battery body 110 in the longitudinal direction. Each valve 103 is provided.

[0087] For example, as shown in Figures 2, 5 and 11, the first side beam 20 of the single cell 100 An explosion-proof valve 103 is provided at the first end facing 1, and exhaust into the first side beam 201 A passage 222 is provided, and the explosion-proof valves 103 of each cell 100 of the first side beam 201 Each of the corresponding positions is provided with an intake port 221, and the intake port 221 communicates with the exhaust passage 222. Furthermore, the pack body 200 is provided with an exhaust port that communicates with the exhaust passage 222, and / or a single cell An explosion-proof valve 103 is provided at the second end of 100 facing the second side beam 202, and the second An exhaust passage 222 is provided inside the side beam 202, and each of the second side beams 202 An air intake port 221 is provided at each of the positions corresponding to the explosion-proof valve 103 of the single cell 100, and the intake The opening 221 is connected to the exhaust passage 222, and the exhaust is connected to the pack body 200 via the exhaust passage 222. A hole is made.

[0088] In conventional technology, during the use of a single cell, the internal pressure rises to a certain level. If this happens, the explosion-proof valve will open, and the flame, smoke, or gas inside the single cell will be discharged through the explosion-proof valve, and the power will be released. If these particles accumulate inside the battery pack and cannot be discharged in a timely manner, it can cause secondary damage to the individual cells. To cause damage. In the embodiments of the present application, the first side beam 201 and / or the second side The beam 202 is provided with an air intake port 221 corresponding to the explosion-proof valve 103 of the single cell 100, and Exhaust passage 222 inside the first side beam 201 and / or the second side beam 202 Because of the provision, when the air pressure inside the single cell 100 rises, its explosion-proof valve 103 opens, The flames, smoke, or gases inside pass directly through the intake port 221 to the first side beam 2 Entering the exhaust passage 222 in the 01 and / or second side beam 202 and passing through the exhaust port and 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 vent, and in this way the flame, smoke, or gas is discharged into the pack body 200 The flames, smoke, or gases do not accumulate inside, and the flames, smoke, or gases cause secondary damage to the single cell 100. To avoid doing that.

[0089] Furthermore, each of the multiple single cells 100 has one end connected to the first side beam 20 Exhaust is performed through the exhaust passage 222 within 1, and the other end is through the exhaust passage 22 within the second side beam 202 2 is exhausted, and in this way, both ends of the single cell 100 are exhausted through different passages, exhaust distance By increasing the separation and forming alternating exhausts, the temperature can be reduced.

[0090] Hereinafter, with reference to the drawings, an electric vehicle 1 according to an embodiment of the present application will be described, and this electric vehicle is By using a power battery pack to provide electrical energy, the need to drive the vehicle is eliminated. This includes certain commercial vehicles, special-purpose vehicles, electric bicycles, electric motorcycles, electric scooters, and other electric vehicles. That's fine.

[0091] As shown in Figures 9 and 10, the electric vehicle 1 according to the embodiment of the present application is the above embodiment of the present application. The power battery pack 10 is included, and the pack body 200 is integrally molded with the electric vehicle. It may also be a vehicle tray that houses and mounts a single 100-cell battery, which is often manufactured independently. stomach.

[0092] 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 technology, it is possible to improve the driving range without increasing the space occupied by the battery. ru.

[0093] In some specific embodiments of the present application, as shown in Figures 9 and 10, the power battery The pack 10 is located at the bottom of the electric vehicle 1, and the pack body 200 is located at the bottom of the electric vehicle 1. It is fixedly connected to the chassis. Due to the large mounting space on the chassis of the electric vehicle 1, the power battery part By installing the buckt 10 on the chassis of the electric vehicle 1, the number of single cells 100 can be reduced as much as possible. By increasing this, the driving range of electric vehicle 1 can be improved.

[0094] In some specific examples of this application, as shown in Figures 9 and 10, the electric vehicle 1 is electric The power battery pack 10 is located at the bottom of the motor vehicle 1, and the pack body 200 is The power battery pack 10 is fixedly connected to the chassis of the electric vehicle 1, and its width is such that it is located within the electric vehicle 1. The width direction of the vehicle body, that is, the left-right direction of the electric vehicle 1, and the longitudinal direction of the electric vehicle 1 It is positioned along the longitudinal direction of the vehicle body, that is, along the front-to-rear direction of the electric vehicle 1. The electric vehicle 1 includes a plurality of power battery packs 10 located at the bottom of the electric vehicle 1. The shapes and dimensions of the multiple battery packs 10 may be the same or different. Each power battery pack 10 can be adjusted according to the shape and dimensions 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, in the front-to-back direction.

[0095] In some specific examples of this application, the ratio of the width F of the pack body 200 to the width W of the vehicle body is 5 The condition 0% ≤ F / W ≤ 80% is satisfied. In some other embodiments of the present application, the above power battery The length L of the battery unit and the width W of the vehicle body in the width direction of the rack satisfy the ratio 46% ≤ L / W ≤ 76%. In the above embodiment, only one pack body 200 is provided along the width direction of the vehicle body. This can be achieved, and if there are multiple pack units 200, the multiple pack units 200 These are arranged along the longitudinal direction of the vehicle body. Generally, for many vehicles, the width W of the vehicle body is The range is 500mm to 2000mm, for example, 500mm, 600mm, 1600mm, 1 The dimensions are 800mm and 2000mm, and in some embodiments of this application, the width W of the vehicle body is 60 The range is 0mm to 2000mm, for example, 600mm, 1600mm, 1800mm, 20 It is 00mm. In this application, the length of the vehicle body is 500mm to 5000mm, for passenger cars. For passenger cars, the width is generally 500mm to 1800mm, and several practical aspects of this application In the example, the width of the passenger car may be between 600mm and 1800mm, and in this application, The length of a passenger car body ranges from 500mm to 4000mm.

[0096] In some other embodiments of this application, the width F of the pack body 200 is 500 mm to 150 mm It is 0 mm, and in some embodiments of the present application, the width F of the pack body 200 is 600 mm ~1500mm, and the battery pack disclosed in Chinese Patent Document CN107925028A Much larger than the CN107925028A, it is a battery module 4 of a battery pack. It helps to accommodate the 00, ensures range, and conforms to the dimensions of the vehicle.

[0097] In some specific examples of the present invention, the single cell 100 includes the battery body 110, and the battery body The ratio of the length L to the width W of the vehicle body satisfies 46% ≤ L / W ≤ 76%. In this embodiment This can be achieved by providing only one single 100mAh battery along the width direction of the vehicle body. In other possible embodiments, if such dimensional requirements are met, there may be multiple in the longitudinal direction. This can be achieved by providing a battery module 400 or multiple single cells 100. In several embodiments, the length L of the battery body 110 is 600mm to 1500mm.

[0098] Based on the above, compared to conventional technology, this invention allows for a longer single cell dimension, with a maximum range of 2500m. m can be used, and by applying this single cell to a battery pack, the following technical effects can be achieved. It can be achieved.

[0099] 1. Significant improvement in the volumetric utilization rate of battery packs and improvement in the volumetric energy density of battery packs: Currently, the industry's volume utilization rate is around 40%, but with the design of this invention, the entire interior of the battery pack can be utilized. Batteries can be placed in the body, and the volume utilization rate can be improved to over 60%, and even further to 80%. This is possible, and its volumetric energy density is improved by more than 20%. Similar vehicles use the battery and By adopting this configuration, energy can be improved by 20-30%, and the vehicle's running speed... The possible range can also be improved by 20-30%.

[0100] 2. Significant reduction in battery pack costs: By having the individual cells themselves perform mechanical reinforcement. The reinforcing ribs on the battery tray can be omitted or reduced, improving the battery pack manufacturing process. The design is simple, manufacturing costs are reduced, and the dimensions of the single cell according to this application are such that the dimensions of the battery pack are similar to those of a battery pack. By adjusting the dimensions, individual cells can be directly arranged in a row in the battery pack, unlike conventional technology. First, multiple single cells are placed inside a module frame enclosed by two end plates and two side plates. The batteries are arranged side by side, and there is no need to assemble the battery modules into a battery pack, and the single unit according to this application The battery dimensions are long enough so that multiple single cells can be directly arranged side by side in the battery pack. Next, the end plates, side plates, and battery modules are assembled and fixed in place. By eliminating or reducing the number of fasteners such as screws, the assembly process of the single cell becomes simpler. Yes, it reduces the manufacturing costs, such as the amount of labor and materials involved, making it even more advantageous for the widespread adoption of electric vehicles. .

[0101] 3. Improved battery pack stability and reliability: The battery pack assembly process is becoming more complex. However, this increases the likelihood of defective products occurring, and there is a high possibility that the battery pack may become loose and not securely attached. This can negatively affect the quality of the battery pack, reducing its stability and reliability. Therefore, assembling the single cell according to this application into a battery pack makes the assembly process easier. This improves the stability and reliability of battery packs and reduces the failure rate of battery packs.

[0102] 4. Significant improvement in the heat dissipation safety of the battery pack: The temperature rise of the battery pack is due to both heat generation and heat dissipation. This is the result of using the same capacity, and assuming that the heat generated by the single cell is constant, the present invention is to use the single cell By designing it to be elongated, the heat dissipation effect of the single cell is higher, and the temperature rise of the single cell is lower. Lowering the battery pack, assuming that the operating conditions of the battery pack are constant, the single cell is used, and the battery pack rises Because the temperature decreases, the safety of the battery pack is also greatly improved.

[0103] Based on the remarkable technical effects brought about by the length of the single cell mentioned above, the single cell's own To achieve support for the body, improvements have been made in areas such as the molding process and structural design, This improves the support strength of the case and controls the aspect ratio of the case within a predetermined range. This can be achieved. Furthermore, by optimizing the current collection path, the internal resistance of a single cell can be reduced. Yes, it is possible. Furthermore, improvements in the fluid injection process can be achieved by reducing the length of the single cell, which is a consequence of the longer dimensions of the single cell. This also solves the problem of prolonged injection time.

[0104] Other components of the single cell 100, power battery pack 10 and 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.

[0105] The present application will be described below with reference to Comparative Example 1, Comparative Example 2, and Examples 1-3, and the embodiments of the present application will be described below. The single cell 100 is designed with the dimensional parameters of the single cell in mind, resulting in a power battery with improved heat dissipation efficiency. The results are clearly improved.

[0106] The single cell in the following examples and comparative examples is a lithium iron phosphate battery.

[0107] Under the same conditions, rapid charging was performed at a speed of 2C for the single cells in Comparative Example 1 and Examples 1-5. The temperature rise of the single cell during the rapid charging process will be measured. In the table below, each test will be performed. The parameters of length, width, thickness, volume, surface area, and energy of a single cell in the example and comparative example. Record the selection of the battery and record the specific temperature rise.

[0108] As can be seen from the data in the table, the single battery 100 according to the present application (that is, Examples 1 to 5) has a different degree of temperature rise reduction compared to the comparative example under rapid charging under the same conditions, and has a heat dissipation effect superior to the prior art.

[0109]

Table 1

[0110] In the description of this specification, the description referring to terms such as "specific example", "specific instance", etc. means that the specific features, structures, materials or characteristics described in combination with the example or instance are included in at least one example or instance of the present application. In this specification, the exemplary expressions of the above terms are not necessarily limited to the same example or instance.

[0111] Although the examples of the present application have been illustrated and described, as can be understood by those skilled in the art, without departing from the principles and main idea of the present application, various changes, modifications, substitutions and deformations can be made to these examples, and the scope of the present application is limited by the scope of the claims and their equivalent scope.

Explanation of Reference Signs

[0112] In the prior art, the power battery pack 10', the pack body 200'', the battery module 400', the side beam 600', the cross beam 500' In the present application, the electric vehicle 1, the power battery pack 10, the single battery 100, the battery body 110, the pack body 20 0, the tray 210, the upper cover 220, the first side beam 201, the second side beam 202, the first end beam 203, the second end beam 204, the exhaust passage 222, the intake port 221, the battery module 400, the first tab 101, the second tab 102, the explosion-proof valve 103 , the side beam 600, the cross beam 500, the longitudinal direction A of the power battery pack 10, the power battery pack 10 in the width direction B, the height direction C of the battery power pack 10, the length L of the battery body 110, the width H of the battery body 110, the thickness D of the battery body 110, the width W of the vehicle body, the width F of the pack body 200 .

Claims

1. A battery pack comprising a housing and a plurality of single cells disposed within the housing, each single cell being Including a battery body, the battery body has a length L, a width H, a thickness D and a volume V, the length L of the battery body is greater than the width H, and the width H of the battery body is greater than the thickness D. The length L of the battery body is L > 600 mm The length L and width H of the battery body are, L / H = 4 to 21 Satisfying the conditions, The thickness D of the battery body and the volume V of the battery body are, D / V=0.00000065mm －２ ~0.00002mm －２ Satisfying the conditions, The battery pack has a longitudinal direction and a width direction perpendicular to the longitudinal direction, the longitudinal direction of the single cell is aligned with the longitudinal direction of the battery pack, and the housing accommodates only one single cell in the longitudinal direction of the battery pack, or the longitudinal direction of the single cell is aligned with the width direction of the battery pack, and the housing accommodates only one single cell in the width direction of the battery pack. Battery pack.

2. The length L and width H of the aforementioned battery body are, L / H = 9-13 The battery pack according to claim 1, characterized in that it satisfies the following conditions.

3. The length L and thickness D of the aforementioned battery body are, L / D=23~208 The battery pack according to claim 1, characterized in that it satisfies the following conditions.

4. The length L of the battery body and the volume V of the battery body are, L / V=0.0005~0.002mm －２ The battery pack according to claim 1, characterized in that it satisfies the following conditions.

5. The width H of the battery body and the volume V of the battery body are, H / V=0.0001mm －２ ~0.00015mm －２ The battery pack according to claim 1, characterized in that it satisfies the following conditions.

6. The battery pack according to claim 1, wherein the longitudinal direction of the single cell is aligned with the longitudinal direction of the battery pack, and both ends of the single cell in the longitudinal direction are fitted into the side walls of the housing that are opposite to the longitudinal direction of the battery pack, or the longitudinal direction of the single cell is aligned with the width direction of the battery pack, and both ends of the single cell in the longitudinal direction are fitted into the side walls of the housing that are opposite to the width direction of the battery pack.

7. The length L of the battery body and the surface area S of the battery body are, L / S=0.002mm －１ ~0.005mm －１ The battery pack according to claim 1, characterized in that it satisfies the following conditions.

8. The surface area S of the battery body and the volume V of the battery body are, S / V=0.1mm －１ ~0.35mm －１ The battery pack according to claim 1, characterized in that it satisfies the following conditions.

9. The surface area S of the battery body and the energy E of the battery body are, S / E≦1000mm ２ ・Wh －１ The battery pack according to claim 1, characterized in that it satisfies the following conditions.

10. The length L of the battery body and the energy E of the battery body are, L / E=0.8mm・Wh －１ ~2.45mm・Wh －１ The battery pack according to claim 1, characterized in that it satisfies the following conditions.

11. The length L of the battery body and the energy E of the battery body are, L / E=1.65mm・Wh －１ ~2.45mm・Wh －１ The battery pack according to claim 1, characterized in that it satisfies the following conditions.

12. The battery pack according to claim 1, characterized in that the length L of the battery body is 600 mm to 2500 mm (excluding L = 600 mm).

13. The battery pack according to claim 12, characterized in that the length L of the battery body is 600 mm to 1500 mm (excluding L = 600 mm).

14. The battery pack according to claim 1, characterized in that the longitudinal and thickness directions of the battery body extend along the horizontal direction, and the width direction of the battery body extends along the vertical direction.

15. A first electrode tab is provided at one end in the longitudinal direction of the battery body, The battery pack according to claim 1, further comprising a second electrode tab provided at the other end in the longitudinal direction of the battery body.

16. The battery pack according to claim 1, characterized in that the single cell is an aluminum shell rectangular cell.

17. The battery pack according to claim 16, characterized in that the single cell is provided with at least one explosion-proof valve, the explosion-proof valve being provided at at least one end in the longitudinal direction of the battery body.

18. The battery pack according to claim 16, characterized in that explosion-proof valves are provided at both ends of the battery body in the longitudinal direction.

19. The aforementioned single cell is a pouch cell, and the length L and width H of the battery body are, L / H = 7-20 The battery pack according to claim 1, characterized in that it satisfies the following conditions.

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