Power battery pack and electric vehicle

Abstract

To provide a power battery pack that has advantages, such as a high space utilization factor, a large energy density, and a high cruising capability, and to provide an electric automobile, and a single battery included in the power battery pack.SOLUTION: Provided is a single battery in which a battery main body included in the single battery has a length L, a width H, and a thickness D, the length L being larger than the width H, the width H being larger than the thickness D. The battery main body satisfies relations of 400 mm≤L≤2,500 mm and H / V=0.0001 mm-2 to 0.00015 mm-2. A power battery pack includes a pack main body, and a plurality of single batteries therein. Each single battery has a length L0, a width H0, and a thickness D0 that satisfy L0>H0≥D0. In a case where the power battery pack is arranged on an electric automobile, the single battery extends so that its longitudinal direction is along a width direction or a longitudinal direction of the electric automobile. In a case where the single battery extends so that its longitudinal direction is along the width direction of the electric automobile, the length L0 of the single battery and a dimension W in the width direction of a vehicle body of the electric automobile satisfy 46%≤L0 / W≤76%.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application was filed by B.W.D. Company Limited on January 9, 2019. Chinese patent application No. 20191 for the invention "Battery pack, vehicle and energy storage device" 0021244.0", "201910020967.9", "20191002124 6.X", "201910021248.9", "201910021247.4" and This application claims priority from No. 201910020925.5, the entire contents of which are hereby incorporated by reference. The present application is incorporated by reference.

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

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

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

[0005] In the related prior art, as shown in FIG. 1, the pack body 2 of the power battery pack 10' 00'' is a cross beam 500' and a side beam 600', which are used to connect multiple battery modules. The battery module 400' is often divided into mounting areas, and the battery module 400' is The battery module is fixed to the cross beam 500' or the side beam 600' by the above method. The battery 400' includes a plurality of cells arranged in series. The battery array is formed with end plates and / or side plates on the outside. The end plate and the side plate are fixed together to enclose a space that houses the battery array. The end plates and side plates are connected by screws or tabs to secure the battery array. The connection is made by other connecting members such as a wire rod.

[0006] The applicant has confirmed through testing and analysis that the battery module 400' is closed by a structure such as a screw. Since the casing is fixed to the side beam 500' or the side beam 600', space is wasted. , the weight increases due to the increase in the number of connecting members such as screws. ' is designed by combining end plates and side plates, and both the end plates and side plates have a certain thickness and height. Therefore, the space inside the pack body 200'' is wasted. In general, the volume utilization rate of the power The battery pack 10' is made up of a battery pack body 200'' and a battery pack body 200''. The ratio of the volume of the ' to the volume of the ' is about 50% in all cases, and even as low as 40%.

[0007] When the space at the bottom of the vehicle is limited, the power battery pack 1 according to the above prior art embodiment According to the battery module 400', the end plates, side plates, and the interior of the power battery pack 10' The above connection and mounting configurations reduce the utilization rate of the internal space of the pack body 200''. As a result, in the power battery pack 10′, the sum of the volumes of the cells and the volume of the pack body 200′ is The ratio is too low, reducing the energy density of the power battery pack.

[0008] The present application aims to solve at least one of the technical problems in the prior art. Therefore, the present invention has advantages such as high space utilization rate, high energy density, and long range. One object of the present invention is to provide a power battery pack having

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

[0010] According to an embodiment of the first aspect of the present application, a power battery pack for supplying power to the electric vehicle is a pack body; and a plurality of unit cells provided in the pack body, , a length L0, a width H0, and a thickness D0, where L0>H0≧D0, and the power battery pack When the battery is disposed in the electric vehicle, the longitudinal direction of the battery is the same as the width direction or the length direction of the electric vehicle. The longitudinal direction of the battery cell extends along the width direction of the electric vehicle. In this case, the length L0 of the cell and the width W of the electric vehicle body are 46% ≦L0 / W≦76%, or the length of the cell is aligned with the length of the electric vehicle. When the battery length L0 and the length X of the electric vehicle body in the longitudinal direction are , 40%≦L0 / X≦76% is satisfied.

[0011] In the power battery according to the embodiment of the present application, the length of the unit cell, the dimension in the width direction of the vehicle body, and the vehicle body By limiting the ratio of the longitudinal dimension of the power battery pack to the vehicle body space, By utilizing this, more single cells can be arranged in a unit space of the vehicle body, that is, To accommodate more energy supply structures, the energy density is improved and the occupied space is reduced. This allows for increased range without increasing the size of the aircraft.

[0012] 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 and other objects, features, and advantages of the present invention will become apparent in the following detailed description or may be learned by practice of the present invention. [Brief explanation of the drawings]

[0013] The above and / or additional aspects and advantages of the present application are described below by way of example with reference to the drawings. This makes it clearer and easier to understand. [Figure 1] FIG. 1 is an exploded view of a power battery pack in the prior art. [Figure 2] 1 is a cross-sectional view of a power battery pack according to an embodiment of the present application. [Figure 3] 1 is a perspective view of a power battery pack according to an embodiment of the present application; [Figure 4] FIG. 1 is an exploded view of a power battery pack according to an embodiment of the present application. [Figure 5] FIG. 1 is a schematic diagram illustrating the configuration of a cell according to an embodiment of the present invention. [Figure 6] 1 is a schematic diagram of an arrangement of battery modules in a power 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 power battery pack according to another embodiment of the present application. [Figure 8] 1 is a schematic diagram illustrating a configuration in which a pack body of a power battery pack according to an embodiment of the present application is formed in an electric vehicle. [Figure 9] 1 is a schematic diagram of an electric vehicle according to an embodiment of the present invention; [Figure 10] 1 is an exploded view of an electric vehicle according to an embodiment of the present application. [Figure 11] FIG. 3 is an enlarged view of region G in FIG. 2. [Figure 12] FIG. 1 is a perspective view of a power battery pack according to a first alternative embodiment of the present application. [Figure 13] FIG. 1 is a perspective view of a power battery pack according to a second alternative embodiment of the present application. [Figure 14] FIG. 10 is a perspective view of a power battery pack according to a third alternative embodiment of the present application. [Figure 15] FIG. 10 is a perspective view of a power battery pack according to a fourth alternative embodiment of the present application. [Figure 16] FIG. 10 is a perspective view of a power battery pack according to a fifth alternative embodiment of the present application. [Explanation of symbols]

[0014] In the prior art, a power battery pack 10', a pack body 200'', a battery module 4 00', Side beam 600', Cross beam 500' In this application, an electric vehicle 1, a power battery pack 10, a single cell 100, a battery body 110, Pack body 200, tray 210, upper cover 220, first side beam 201, second The side beam 202, the first end beam 203, the second end beam 204, the exhaust vent duct 222, air intake 221, battery module 400, first tab 101, second tab 102 , explosion-proof valve 103, side beam 600, cross beam 500, longitudinal direction of power battery pack 10 Direction A, width direction B of the power battery pack 10, height direction C of the power battery pack 10, single battery 10 Length L0 of the battery, width H0 of the cell, thickness D0 of the cell, length L of the battery body 110, 110 width H, thickness D of battery body 110, width W of the body, and width F of pack body 200. DETAILED DESCRIPTION OF THE INVENTION

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

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

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

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

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

[0020] As shown in FIGS. 2 to 16, the power battery pack 10 according to the embodiment of the present invention comprises a pack body 2. The power battery pack 10 includes a plurality of cells 100 and a plurality of single cells 100. The power battery pack 10 supplies power to the electric vehicle 1. Electric vehicles include electric cars, trains, electric bicycles, and golf carts. According to a specific embodiment of the present application, the power battery 10 is fixed to an electric vehicle. will be done.

[0021] The plurality of cells 100 are provided in a pack body 200. The pack body 200 is It can be understood as a case for accommodating the unit cell 100, for example, a tray 210 and an upper The tray 210 and the top cover 220 may together hold a plurality of cells. The storage space for the cells 100 is defined, and the cells 100 are provided in a tray 210 and Covered by a cover 220, that is, formed by the tray 210 and the upper cover 220 The length of the battery cell L0 and the width of the electric vehicle body W The length L0 of the cell and the length L1 of the electric vehicle satisfy 46%≦L0 / W≦76%. The dimension X in the longitudinal direction of the vehicle body satisfies 40%≦L0 / X≦76%.

[0022] In some specific embodiments, the length of the cell 100 is the width of the body of the electric vehicle. When the battery length L0 and the width W of the electric vehicle body are , 46%≦L0 / W≦76%, and in some other specific embodiments, the cell 10 0 is the length L of the single cell when the longitudinal direction extends along the longitudinal direction of the body of the electric vehicle. The relationship between L0 and the longitudinal dimension X of the electric vehicle body satisfies 40%≦L0 / X≦76%.

[0023] As will be understood by those skilled in the art, the width direction of the vehicle body refers to the left-right direction of the vehicle. The width W of the vehicle refers to the width of the vehicle body, and the longitudinal direction of the vehicle refers to the direction in which the vehicle runs. The longitudinal dimension X of the body refers to the length of the body.

[0024] In the power battery pack 10 according to the embodiment of the present application, the length of the cell 100 and the width direction of the vehicle body are The ratio of the dimension W to the dimension L0 / W is limited to 46%≦L0 / W≦76%, or The ratio of the length to the longitudinal dimension X of the vehicle body is limited to 40%≦L0 / X≦76%. As a result, the power battery pack 10 can be installed in a unit space of the vehicle body by fully utilizing the space of the vehicle body. In other words, more energy supply structures can be provided within a unit space. The structure is arranged to improve energy density and increase range without increasing the space occupied. can be improved.

[0025] In some embodiments of the present application, multiple The sum of the volumes of the cells 100, V1, and the volume of the power battery pack 10, V2, is V1 / V2≧55%. In some embodiments of the present application, the sum V1 of the volumes of the plurality of cells 100 and the power battery The volume V2 of the pack 10 satisfies V1 / V2≧60%, and in some embodiments of the present application, The sum V1 of the volumes of the plurality of cells 100 and the volume V2 of the power battery pack 10 are V1 / V2≧6 2%, and in some embodiments of the present application, the sum V1 of the volumes of the plurality of single cells 100 and the power The volume V2 of the battery pack 10 satisfies V1 / V2≧65%. The total volume of the three-dimensional shape defined by the outer periphery of the power battery pack 10. The volume includes the internal space of the power battery pack 10, i.e., the volume enclosed by the outer shell of the power battery pack 10. In electric vehicles, V1 / V2 can be understood as the space utilization rate. This can be done.

[0026] As will be appreciated by those skilled in the art, several factors can affect the performance of the device, for example, the bottom of the tray. Internal collision prevention space and liquid cooling system, heat insulation material, insulating protection material, thermal safety auxiliary parts, flame exhaust and peripheral components including an exhaust passage, a high-voltage power distribution module, etc. occupy the internal space of the pack body 200 Therefore, the maximum value of V1 / V2 is generally 80%, that is, V1 / V2 ≤ 80% is true.

[0027] Hereinafter, referring to the drawings, the power battery pack 10 according to specific embodiments of the present application will be described. The longitudinal direction of the power battery pack 10 is indicated by arrow A, the width direction is indicated by arrow B, and the height direction is indicated by arrow C.

[0028] In some specific embodiments of the present application, as shown in FIGS. 2 to 4, the single battery 100 is arranged such that 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.

[0029] In some specific examples of the present application, as shown in FIGS. 3 and 4, in the width direction B of the power battery pack 10, the distance between the single battery 100 and the side wall of the pack body 200 is smaller than the length of the single battery 100. Specifically, in the width direction B of the power battery pack 10, the closest distance between one end of the single battery 100 and the side beam of the pack body 200 adjacent to it (one end of the above single battery 100) is L1, and the closest distance between the other end of the single battery 100 and the side beam of the pack body 200 adjacent to it (the other end of the above single battery 100) is L2, and the length L0 of the single battery 100 satisfies L1 + L2 < L0. Thus, in the width direction B of the power battery pack 10, another additional single battery 100 cannot be accommodated.

[0030] In other words, the pack body 200 is arranged so that one cell 1 is disposed in the width direction B of the power battery pack 10. In other words, in the width direction B of the power battery pack 10, two or more single cells 100 are accommodated. cannot be placed in numbers greater than two.

[0031] As can be seen, in the width direction B of the power battery pack 10, both sides of the pack body 200 are The power battery pack 10 has a longitudinal direction A, and both ends of the pack body 200 are It is a beam.

[0032] In some embodiments of the present application, as shown in FIGS. 3 and 4, the length of the cell 100 is It extends over the entire width direction B of the power battery pack 10, i.e., The cell 100 extends from one side of the pack body 200 to the other side along the length of the cell 100. The depth is filled in the width direction B of the power battery pack 10, and the pack body 200 is In the width direction B of the cell 10, two or more cells 100 cannot be arranged. The longitudinal ends of the reservoir 100 are fitted into the opposite side walls of the pack body 200 in the width direction B. For example, it can be fixed to the pack body 200. There is no need for a cross beam or a side beam in the section, and the unit cell 100 is directly connected. The structure of the pack body 200 is greatly simplified, and the reinforcing rib By reducing the space occupied by the battery and the space occupied by the mounting structure of the battery 100, Improve utilization and improve range.

[0033] Naturally, the embodiment of the present application does not include the cross beam and the side beam. In some embodiments of the present application, as shown in FIG. 13, A cross beam 500 may be provided, and the cross beam 500 may be The power battery pack 10 extends along a width direction B, and the plurality of cells 100 are arranged along a longitudinal direction A of the power battery pack 10. The cross beam 500 connects the battery array to the power battery pack. The battery array is divided into at least two parts along the longitudinal direction A of the battery pack 10, and each part of the battery array is at least Each of the cells includes one cell 100 and constitutes one battery module 400 .

[0034] Of course, in some other embodiments of the present application, the pack may be used as shown in FIG. Side beams 600 may be provided within the body 200, and the side beams 600 may be powered by a power battery. The longitudinal direction of the power battery pack 10 is parallel to the longitudinal direction A of the power battery pack 10. The plurality of cells 100 are arranged along the width direction B of the power battery pack 10. The power battery pack 200 is arranged along the direction A to form a battery array. 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 power battery pack 10 includes a plurality of power cells 100 arranged along the longitudinal direction A, The guide beam 600 is located between two adjacent rows of the battery array.

[0035] 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 The pack body 200 is supported by the frame, and is located at both ends of the power battery pack 10 in the longitudinal direction A. The end beams are oriented inwardly relative to the adjacent cells 100. provides a pressing force of

[0036] As shown in FIGS. 3 and 4, the pack body 200 includes a first side beam 201, a second side beam 202, and a It has a side beam 202, a first end beam 203 and a second end beam 204, A first side beam 201, a second side beam 202, a first end beam 203, and a The two end beams 204 are connected in series to form the first side beam 201 and the second side beam 202. The first end beam 202 faces the power battery pack 10 in the width direction B, and the second end beam 203 The first end beam 201 and the second end beam 204 face each other in the longitudinal direction A of the power battery pack 10. The side beam 201 and the second side beam 202 are supported at both ends of the cell 100 in the longitudinal direction. Provides support, i.e., one end of the cell 100 is supported by the first side beam 201; and The other end is supported by the second side beam 202. The first end beam 203 and the second end beam The end beam 204 provides a pressing force on both sides of the thickness of the cell 100, i.e., the first end beam 204 The first end beam 203 is connected to the cell 100 adjacent to the first end beam 203. A force is applied to the second end beam 204, and the second end beam 204 The cell 100 provided adjacent to the end beam 204 is directed toward the first end beam 203. Such an acting force is applied, and thus the plurality of cells 100 are arranged in the longitudinal direction of the power battery pack 10. Closely arranged between the first end beam 203 and the second end beam 204 along the direction A The first end beam 203 and the second end beam 204 can be attached to each other. The end beams 204 are arranged to support the plurality of cells 100 in the longitudinal direction A of the power battery pack 10. In particular, when the cell 100 expands slightly, a buffering effect is provided to the cell 100. and provide inward pressure to prevent the expansion and deformation of the cell 100 from becoming too large. This can be prevented.

[0037] In some embodiments of the present application, as shown in FIG. 7, the length of the cell 100 is the power The cells 100 are arranged along the width direction B of the battery pack 10. 10 along the longitudinal direction A to form a battery array, and a power battery is The battery pack 10 includes at least two layers of battery arrays along the height direction C. By optimizing the number of batteries 100, space utilization is improved and energy density is increased. This makes it easy to integrate BIC and low-voltage samplers.

[0038] In some specific embodiments of the present application, as shown in FIGS. 15 and 16, a single cell 100 The longitudinal direction of the power battery pack 10 is aligned with the longitudinal direction A of the power battery pack 10, and the plurality of single cells 1 00 are arranged along the width direction B of the power battery pack 10, Helps set space utilization rates at 50%, 60%, 62%, 65% or higher tsu.

[0039] In some embodiments of the present application, as shown in FIGS. 15 and 16, the power battery pack 10 In the longitudinal direction A, the distance between the cell 100 and the end wall of the pack body 200 is Specifically, in the longitudinal direction A of the power battery pack 10, the length of the single cell 100 and the end beam of the pack body 200 adjacent to it (one end of the cell 100), The closest distance between the other end of the cell 100 and the other end of the cell 100 is L3. The closest distance between the end beam of the pack body 200 adjacent to the The length L0 of the cell 100 satisfies L3 + L4 < L0. Thus, in the longitudinal direction A of the power battery pack 10, it is impossible to accommodate another additional single cell 100.

[0040] 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 cells 100 cannot be arranged in a number of two or more.

[0041] 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.

[0042] In some specific examples of the present application, as shown in FIGS. 15 and 16, the length of the single cell 100 extends throughout the longitudinal direction A of the power battery pack 10, that is, along the longitudinal direction A of the power battery pack 10, the single cell 100 extends from one end to the other end of the pack body 200, and the length of the single cell 1 00 fills the longitudinal direction A of the power battery pack 10. The pack body 200 cannot arrange two or more single cells 100 in the longitudinal direction A of the power battery pack 10, and both ends in the longitudinal direction of the single cell 100 fit into both end walls facing the longitudinal direction A of the pack body 200 and can be fixed to the pack body 200, for example. Thereby, the pack body 200 does not require cross beams and side beams inside, and directly, the connected single cells 100 serve as reinforcing ribs, greatly simplifying the structure of the pack body 200, and reducing the space occupied by the reinforcing ribs and the space occupied by the mounting structure of the single cells 100. Thereby, there is no need for cross beams and side beams inside the pack body 200, and directly, the connected single cells 100 serve as reinforcing ribs, greatly simplifying the structure of the pack body 200, and reducing the space occupied by the reinforcing ribs and the space occupied by the mounting structure of the single cells 100. and reducing the space occupied by the reinforcing ribs and the space occupied by the mounting structure of the single cells 100. This will improve space utilization and enhance cruising capability.

[0043] Naturally, the embodiment of the present application does not include side beams and cross beams. In some embodiments of the present application, as shown in FIG. 15, A side beam 600 may be provided, and the side beam 600 may be provided. The power battery pack 10 extends along a longitudinal direction A, and the plurality of cells 100 are arranged along a width direction B of the power battery pack 10. The side beams 600 are arranged to form a battery array, and the battery array is connected to the power battery panel. The battery array is divided into at least two parts along the width direction B of the battery pack 10. , includes at least one cell 100 and constitutes one battery module 400.

[0044] Of course, in some other embodiments of the present application, cross-beams may be provided within the pack body 200. The cross beam 500 may be provided in the width direction B of the power battery pack 10. The longitudinal direction of the cell 100 is aligned with the longitudinal direction A of the power battery pack 10. The plurality of cells 100 are arranged along the width direction B of the power battery pack 10. A battery array is formed, and a small amount of At least two rows of battery arrays are arranged, and each row of battery arrays is The cross beam 500 includes a plurality of cells 100 arranged along the direction B. Located between the battery arrays in the row.

[0045] In some embodiments of the present application, the pack body 200 is The battery 100 includes end beams positioned at both ends thereof, and both ends of the battery 100 in the longitudinal direction are The pack body 200 is supported by the frame, and is located on both sides of the power battery pack 10 in the width direction B. The side beams are oriented inward relative to the adjacent cells 100. provides a pressing force of

[0046] As shown in FIG. 16, the pack body 200 includes a first side beam 201, a second side beam 202, and a beam 202, a first end beam 203 and a second end beam 204, Side beam 201, second side beam 202, first end beam 203, second end beam The side beam 204 is connected in series with the first side beam 201 and the second side beam 202. The beams 202 face each other in the width direction B of the power battery pack 10, and are connected to the first end beam 203 and the second end beam 204. The first end beam 204 faces the longitudinal direction A of the power battery pack 10. The frame 203 and the second end beam 204 provide support to both ends of the unit cell 100 in the longitudinal direction. That is, one end of the cell 100 is supported by the first end beam 203, and the other end is The first side beam 201 and the second side beam 202 are supported by the second end beam 204. The frame 202 provides a pressing force on both sides of the cell 100 in the thickness direction, i.e., the first side beam The side beam 201 is connected to the cell 100 adjacent to the first side beam 201. A force is applied to the second side beam 202, and the second side beam 202 The cell 100 adjacent to the beam 202 is directed toward the first side beam 201. In this way, the plurality of cells 100 are arranged along the width direction B of the power battery pack 10. Therefore, the first side beam 201 and the second side beam 202 are closely arranged, and The first side beam 201 and the second side beam 202 can be attached to each other. The beam 202 regulates the positions of the plurality of cells 100 in the width direction B of the power battery pack 10. In particular, when the cell 100 expands slightly, the cell 100 is cushioned. It plays a role of providing inward pressure, and the expansion and deformation of the unit cell 100 are large. This can prevent the device from overheating.

[0047] In some embodiments of the present application, as shown in FIG. 15, the cell 100 has a longitudinal direction that is a power The plurality of cells 100 are arranged along the longitudinal direction A of the battery pack 10. The pack body 200 includes a battery array. The battery pack 10 includes at least two layers of battery arrays along the height direction C. By optimizing the number of cells 100, the space utilization rate is improved and the energy density is increased. It is also easy to integrate BIC and low-voltage samplers.

[0048] In some specific embodiments of the present application, the plurality of cells 100 may be arranged in a plurality of battery modules. 400, and a plurality of battery modules 400 can be assembled into the power battery pack 10. They may be arranged along the longitudinal direction A (as shown in FIG. 6) or along the width direction B of the power battery pack 10. 15), and may be arranged along the height direction C of the power battery pack 10. The cells 100 may be arranged in a multi-layer structure (as shown in FIG. 7). Whether extending along the width direction B of the pond pack 10 or along the longitudinal direction A The plurality of cells 100 are arranged in layers along the height direction C of the power battery pack 10. Of course, the plurality of battery modules 400 can be used to form a power battery pack. The power battery pack 10 may be arranged along the longitudinal direction A and the height direction C of the power battery pack 10 The battery modules may be arranged simultaneously along the width direction B and the height direction C. The number of modules is optimized to improve space utilization and increase energy density. It is easy to integrate BIC and low voltage samplers. The battery module 400 in this embodiment does not have structures such as end plates and side plates. do.

[0049] In the prior art, the size of the unit cell is small, the length is short, and the opposite ends of the unit cell are Since the two side walls of the lock body 200'' cannot be fitted to each other, The pack body 200 ′ includes a side beam 600 ′ and / or a cross beam 500 ′ (FIG. 1 In this way, the assembly of the cells becomes easy. After being installed in the pack body 200'' in the form of a module 400'', the power battery pack 10 There are a plurality of cells along the width direction of the battery. That is, the cells are two cells arranged opposite each other. Two side beams 600' or cross beams 500' are provided opposite each other and do not extend between the side walls. 00', and the battery module is fastened to the adjacent side beams 600' and and / or fixed to the cross beam 500'.

[0050] In the prior art, side beams 600′ and / or cross beams are provided in the pack body 200′. The side beams 600' and / or the cross beams 500' are provided. Since the pack body 200 ′ takes up a large amount of space for accommodating the cells, The space utilization rate of the pack body 200'' is low, and generally, the sum of the volume of the cells and the pack body 200'' The ratio of the volume of the pack to the volume of the pack is about 40%, and is even lower than that. Only about 40% of the space inside the 200" body is available for installing the cells, The number of cells that can be accommodated in the main body 200'' is limited, and the capacity and power of the entire power battery pack 10'' are The pressure is limited, and the driving range of the power battery pack 10' is low. 200′, side beams 600′ and / or cross beams 500′ may be provided. , the side beams 600' are provided in the pack body 200', or the pack body 20 Cross beams 500' may be provided in pack body 200', or side beams may be provided in pack body 200'. This means that the beam 600' and the cross beam 500' are provided at the same time.

[0051] According to the power battery pack 10 of the present embodiment, the side beams in the pack body 200 and / or cross beams can be reduced, and side beams and Thus, the side beams and / or cross beams may not be provided. The space occupied by the beam in the pack body 200 is reduced, and the space utilization rate of the pack body 200 is improved. While increasing the number of battery modules, the use of end and side plates in the battery module 400 is reduced, and the end and side plates The space occupied by the pack body 200 is reduced, and the space utilization rate of the pack body 200 is improved. By arranging as many cells 100 as possible in the pack body 200, This improves the capacity, voltage and driving range of the entire power battery pack. Reducing the use of side beams and / or cross beams reduces the size of the pack body 200. Reduced use of side beams or reduced use of cross beams within the pack body 200 or reducing the use of side beams and cross beams within the pack body 200. This means that the pack body 200 does not need to have side beams and / or cross beams. The advantage is that there is no need to provide side beams in the pack body 200 or There is no need to provide a cross beam in the pack body 200, or there are no side beams in the pack body 200. This means that no side beams or cross beams are provided, and side beams and / or cross beams are provided. Reducing the space taken up within the pack body 200 is achieved by reducing the space taken up by the side beams within the pack body 200. Reducing the space taken up or the space taken up by the cross beams within the pack body 200 or reducing the space that the side beams and cross beams take up within the pack body 200. It means to do.

[0052] In addition, there is no need to arrange side beams and / or cross beams inside the pack body 200. Therefore, the manufacturing process of the pack body 200 is simplified, and the complexity of assembling the unit cells 100 is reduced. This reduces the weight of the pack body 200 and the entire power battery pack 10, thereby reducing production costs. This reduces the weight of the power battery pack 10. In particular, the power battery pack 10 is When installed on an electric vehicle, it can improve the driving range of the electric vehicle and reduce the weight of the electric vehicle. Side beams and / or cross beams may be arranged within the pack body 200. What is not required is that there is no need to dispose side beams within the pack body 200; Alternatively, there is no need to place a cross beam within the pack body 200, or the pack body 20 This means that there is no need to place side beams and cross beams within 0.

[0053] In addition, the single cell 100 itself is used to reinforce the structural strength of the pack body 200, That is, there is no need to provide an additional reinforcing structure inside the pack body 200 to reinforce its structural strength. Instead of a reinforcement structure, the structural strength of the pack body 200 is ensured by the single cell 100 itself, and the pack body This ensures that the body 200 is not easily deformed under the action of external force. Compared to the battery pack disclosed in No. 107925028A, the pack body 200 has a single cell 100 The battery pack 10 is also used to store and protect the battery. The overall load-bearing capacity can be improved, and the length of the single cell 100 is 0. Also, by increasing the surface area of ​​the single cell 100, , the heat dissipation area of ​​the cell 100 is increased, the heat dissipation rate of the cell 100 is improved, and the power Improve the safety of the entire battery pack 10, making the power battery pack 10 safer and more reliable. This can be done.

[0054] In some embodiments of the present application, the cell 100 includes a battery body 110 (including small dimensions such as tabs). The battery body 110 includes a volume V and a current The energy E of the pond body 110 is V / E≦2000 mm 3 ·Wh- 1 This satisfies the following. This not only ensures a sufficient heat dissipation area to ensure heat dissipation, but also reduces the volume ratio of 100 cells. The number of cells 100 can be reduced, and the power battery pack 10 can be compactly arranged. It helps to

[0055] In some specific embodiments of the present application, as shown in FIGS. 9 and 10, 200 is different from the battery pack case disclosed in Chinese patent document CN107925028A. The puck body 200, particularly in terms of size and load bearing, is adapted to engage with the vehicle body / chassis. and a battery 100 for receiving and supporting the battery 100. The vehicle tray 210 may include a vehicle tray 210 connected to the vehicle tray 210, which may be manufactured independently. The tray is manufactured to accommodate and mount the unit cells 100. After installation in the vehicle tray 210, the vehicle tray 210 can be attached to the vehicle body with fasteners. For example, it can be suspended from the chassis of an electric vehicle to provide containment and load support.

[0056] The power battery pack 10 is used in a vehicle to supply electrical energy. When the electric vehicle is used as a vehicle body, the longitudinal direction of the unit cell 100 is set to the width direction or the length direction of the body of the electric vehicle. In this case, the single cells may be arranged along the left-right direction or the running direction of the vehicle. The length of the battery 100 is adjusted to the width or length of the vehicle. The length L of the battery body 110 of 00 may be 400 mm to 2500 mm.

[0057] In some embodiments of the present application, as shown in FIG. 8, the pack body 200 is mounted on an electric vehicle. It may be directly formed, i.e., the pack body 200 may be formed in any suitable location on the electric vehicle. The pack body 200 is a device for mounting the cells 100. For example, The chassis may be formed in the same manner as the first embodiment.

[0058] In some exemplary embodiments of the present application, the power battery pack 10 is disposed in an electric vehicle. In this case, unlike the battery pack disclosed in the Chinese patent document CN107925028A, The battery management system (BMS), battery connector, battery sampler and battery thermal tube are included in the BMS. The vehicle battery further includes components necessary for the vehicle battery, such as at least one of the power supply and power management systems. The width direction B of the battery pack 10 is along the width direction of the body of the electric vehicle, that is, along the left-right direction of the vehicle. At the same time, the longitudinal direction is arranged along the longitudinal direction of the vehicle body, i.e., along the front-rear direction of the vehicle. However, the present application is not limited to this, and the width direction B of the power battery pack 10 is The electric vehicle is arranged along the longitudinal direction of the body of the vehicle, and the longitudinal direction A is the width direction of the body of the electric vehicle. It may be arranged along the direction.

[0059] As will be understood by those skilled in the art, the orientation of the cells 100 within the power battery pack 10 The orientation of the power battery pack 10 in the electric vehicle can be combined in different ways. For example, the length of the cells 100 is aligned along the width direction B of the power battery pack 10. The longitudinal direction of the power battery pack 10 may be aligned with the longitudinal direction A of the power battery pack 10. The power battery pack 10 may be arranged such that the width direction B is aligned with the width direction of the body of the electric vehicle. The width direction B may be arranged along the longitudinal direction of the vehicle body, and further, For example, the power battery pack 10 is mounted so that the width direction B is aligned with the width direction of the body of the electric vehicle. Regardless of whether the cell 100 is arranged in the longitudinal direction of the vehicle body or along the longitudinal direction of the vehicle body, The electric vehicle is arranged such that the longitudinal direction of the electric battery 100 is parallel to the width direction of the body of the electric vehicle. The relative orientation of the battery pack 10 and the vehicle body can be set according to the actual application. different requirements can be met.

[0060] Hereinafter, a cell 100 according to an embodiment of the present invention will be described with reference to the drawings.

[0061] In the following specific examples, the units of length L, width H and thickness D are all millimeters. (mm), and the unit of surface area S is square millimeters (mm 2 ) and the unit of volume V is cubic millimeters (mm 3 ) and the unit of energy E is the watt-hour (Wh). do.

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

[0063] According to the embodiment of the present application, the length L of the battery body 110 is greater than the width H of the battery body 110. The width H of the battery body 110 is greater than the thickness D of the battery body 110, and the length The relationship between L and the width H of the battery body 110 satisfies L / H=4 to 21. According to the above, the length L of the battery body 110 and the width H of the battery body 110 satisfy the relationship L / H=9 to 13. vinegar.

[0064] The battery cell 100 according to the embodiment of the present application is designed so that the ratio of the length L to the width H of the battery body 110 is This allows the battery body 110 to be reasonably flattened with a constant volume, and the power battery pack This is useful for overall alignment within the pack (for example, the power battery pack 10 according to the above embodiment of the present application). By realizing 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 driving range of the power battery pack can be improved, while the single battery 100 has a large enough heat dissipation area, and the internal heat is released to the outside in a timely manner. It is suitable for high energy density by conducting heat and preventing heat from accumulating inside. , and can support improved range.

[0065] In some embodiments of the present application, the arrangement of the cells 100 in the power battery pack is optimized, In order to improve the heat dissipation capacity of the battery 100, the length L and thickness D of the battery body 110 are: According to some specific embodiments of the present application, the battery body 1 satisfies L / D=23 to 208. The length L and thickness D of the electrode 10 satisfy L / D=23 to 200. According to the embodiment, the length L and thickness D of the battery body 110 satisfy L / D=50-70.

[0066] In some specific embodiments of the present application, as shown in FIG. 5, the battery body 110 has a certain To ensure structural strength, the outer surface is formed in a smooth rectangular parallelepiped shape. For example, the battery electrode body Place it in a rectangular battery case, seal the opening of the battery case with the cover plate, and pour in the electrolyte. Compared with the cell using the Lumiplastic composite film, the cell 100 according to the embodiment of the present application has a thermal conductivity of High performance and combined with conventional battery thermal management structures, it solves the heat dissipation problem caused by large size structures. Compared with cylindrical batteries, it has a higher space utilization rate and is easier to manufacture. The establishment process is easier.

[0067] The cell 100 according to the embodiment of the present application is disposed in the pack body 200 of the power battery pack 10. In this case, the battery body 110 has a lengthwise direction and a thickness direction that extend along the horizontal direction, and a width direction that extends along the horizontal direction. That is, the cells 100 are arranged vertically, and the horizontal direction The vertical and horizontal directions are both used when the power battery pack 10 is used (for example, when an electric vehicle (when applied to) is the reference direction.

[0068] In some embodiments of the present application, the arrangement of the cells 100 within the power battery pack 10 is optimized. This improves energy density, increases range, and reduces the limited space available in the pack body 200. In the meantime, the arrangement of the battery body 110 can be made more compact, and the energy can be more concentrated. Next, other parameters of the cell 100 are designed.

[0069] 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 is L / V=0.0005mm -2 ~0.002mm -2 and fulfill some of the objectives of this application. In this embodiment, the width H of the battery body 110 and the volume V of the battery body 110 are expressed as H / V=0.0001 m m -2 ~0.00015mm -2 In some embodiments of the present application, the battery body 11 The thickness D of the battery body 110 and the volume V of the battery body 110 are D / V = 0.0000065 mm -2 ~0.0 0002mm -2 This satisfies the following condition: For a battery body 110 having a certain volume, the length L By designing the ratio of width H and thickness D to volume V, the energy per unit quantity can be This optimizes the spatial distribution of the ghee and thus aids in its placement within the pack body 200.

[0070] In some embodiments of the present application, the length L of the battery body 110 and the surface area S of the battery body 110 are , L / S=0.002mm -1 ~0.005mm -1 and some embodiments of the present application Then, the length L of the battery body 110 and the energy E of the battery body 110 are L / E=0.8 mm ·Wh -1 ~2.45mm·Wh -1 According to some embodiments of the present application, the battery The length L of the main body 110 and the energy E of the battery main body 110 are L / E = 1.65 mm·Wh - 1 ~2.45mm·Wh -1 In this way, the unit cells 100 are packed in the longitudinal direction. By straddling both opposing sides of the main body 200, the range of the power battery pack 10 is increased. This improves the capacity, while also achieving both the structural strength and heat dissipation effect of the cell 100.

[0071] In some other examples of the present application, the surface area S of the battery body 110 and the volume V of the battery body 110 are , S / V=0.1~0.35mm -1 This satisfies the requirement for sufficient radiation. Not only does it guarantee the heat dissipation effect by ensuring the heat surface area, but it also reduces the volume ratio of the single cell 100. This helps to make the arrangement of the multiple cells 100 in the power battery pack 10 more compact.

[0072] According to a specific embodiment of the present application, the surface area S of the battery body 110 and the energy The energy E satisfies S / E≦1000. For example, S / E≦1000mm 2 ·Wh -1 Satisfy In this way, the heat dissipation from the surface of the cell 100 is sufficient, and particularly when the power battery is a ternary or When using high-nickel ternary cathode materials, it is necessary to conduct heat inside the battery in a timely manner. This can ensure the safety of the battery. is a rectangular battery with a smooth outer surface, has a certain structural strength, and has good metal thermal conductivity. Less processing and later assembly difficulties compared to batteries with corrugated surface area .

[0073] In some specific embodiments of the present application, as shown in FIG. 5, the cell 100 further comprises: It includes a first tab 101 and a second tab 102 .

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

[0075] In some embodiments of the present application, the cell 100 further includes an explosion-proof valve 103, as shown in FIG. This includes:

[0076] The explosion-proof valve 103 is provided at least at one end in the longitudinal direction of the battery body 110. If the cell 100 fails, the internal pressure of the cell 100 increases, the explosion-proof valve 103 opens, and the cell To prevent the battery 100 from exploding.

[0077] As will be understood by those skilled in the art, the provision of the explosion-proof valve 103 is advantageous in that it It can be applied not only to hard case batteries but also to pouch batteries, and is explosion-proof. The valve 103 may be provided at a position other than the end of the battery body 100 .

[0078] In some specific embodiments of the present application, the battery body 110 is provided with a plurality of electrodes at both ends in the longitudinal direction thereof. An explosion-proof valve 103 is provided.

[0079] For example, as shown in FIGS. 2, 5 and 11, the first side beam 20 of the cell 100 An explosion-proof valve 103 is provided at the first end of the first side beam 201, and an exhaust valve is provided inside the first side beam 201. A passage 222 is provided to connect the first side beam 201 to the explosion-proof valve 103 of each cell 100. An intake port 221 is provided at each of the positions corresponding to the intake port 221, and the intake port 221 communicates with an exhaust passage 222. The pack body 200 is provided with an exhaust hole communicating with the exhaust passage 222, and / or An explosion-proof valve 103 is provided at a second end of the pond 100 toward the second side beam 202, and a second An exhaust passage 222 is provided inside the first side beam 202, and the second side beam 202 An air intake 221 is provided at each position of the cell 100 corresponding to the explosion-proof valve 103. The air outlet 221 communicates with the exhaust passage 222, and the pack body 200 has an exhaust port 222 communicating with the exhaust passage 222. Pores are provided.

[0080] In the prior art, the internal air pressure of a battery increases to a certain extent during use. If the explosion-proof valve is opened, the flame, smoke or gas inside the cell will be released through the explosion-proof valve, causing the power If these particles accumulate inside the battery pack and cannot be discharged in a timely manner, they may cause secondary damage to the cells. In the embodiment of the present application, the first side beam 201 and / or the second side beam The cylinder 202 is provided with an intake port 221 corresponding to the explosion-proof valve 103 of the cell 100, and the first An exhaust passage 222 is provided inside the first side beam 201 and / or the second side beam 202. Therefore, when the pressure inside the cell 100 rises, the explosion-proof valve 103 opens, and The internal flame, smoke, gas, etc., passes directly through the intake port 221 to the first side beam 201. 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, e.g., exhaust gas. The flame, smoke or gas is discharged into the atmosphere through the hole. The flame, smoke, or gas will not gather in the battery and cause secondary damage to the battery 100. and avoid.

[0081] In addition, one end of each of the plurality of cells 100 is connected to the first side beam 20. The other end of the exhaust gas is exhausted through the exhaust passage 222 in the second side beam 202. 2, and thus both ends of the cell 100 are vented through different passages, and the vent distance is By increasing the separation and creating an alternating exhaust, the temperature can be reduced.

[0082] Hereinafter, an electric vehicle 1 according to an embodiment of the present application will be described with reference to the drawings. The electric vehicle includes: A power battery pack is used to provide electrical energy to drive the vehicle. This includes commercial vehicles, special purpose vehicles, electric bicycles, electric motorcycles, electric scooters and other electric vehicles. That's fine.

[0083] As shown in FIGS. 9 and 10, the electric vehicle 1 according to the embodiment of the present application is The pack body 200 includes the power battery pack 10 according to the present invention, and may be integrally formed with an electric vehicle. It may also be an independently manufactured vehicle tray that houses and mounts the cells 100. stomach.

[0084] The electric vehicle 1 according to the embodiment of the present application utilizes the power battery pack 10 according to the above embodiment of the present application. By using this, it is possible to improve the driving range without increasing the space occupied by the battery. do.

[0085] In some specific embodiments of the present application, as shown in FIGS. 9 and 10, a power battery pack 10 is provided at the bottom of the electric vehicle 1, and the pack body 200 is attached to the chassis of the electric vehicle 1. Since the installation space on the chassis of the electric vehicle 1 is large, the power battery pack By providing the battery 10 on the chassis of the electric vehicle 1, the number of the battery 100 can be increased as much as possible. This allows the driving range of the electric vehicle 1 to be improved.

[0086] In some embodiments of the present application, as shown in FIGS. 9 and 10, the electric vehicle 1 includes an electric The vehicle 1 includes a power battery pack 10 provided at the bottom thereof, and the pack body 200 is The power battery pack 10 is fixedly connected to the chassis of the electric vehicle 1, and the width direction of the power battery pack 10 is The width direction of the body, that is, the left-right direction of the electric vehicle 1, and the longitudinal direction of the body of the electric vehicle 1 The electric vehicle 1 is arranged along the longitudinal direction of the battery 1, i.e., along the front-rear direction of the electric vehicle 1. The direction of the plurality of cells 100 is along the width direction of the power battery pack 10. The power battery pack 10 is arranged in the longitudinal direction to form a battery array. In the example, the electric vehicle 1 includes a plurality of power 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. Each power battery pack 10 can be adjusted according to the shape and size of the chassis of the electric vehicle 1; The plurality of power battery packs 10 are arranged along the longitudinal direction of the vehicle body, that is, along the front-to-rear direction.

[0087] 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 50%. ≦F / W≦80%.

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

[0089] In some embodiments of the present application, the electric vehicle 1 is provided at the bottom of the electric vehicle. The power battery pack 10 has a width direction that is equal to the width of the electric vehicle. The longitudinal direction of the electric vehicle 1 is along the width direction of the vehicle body and the longitudinal direction of the electric vehicle 1. The cells 100 are arranged such that the longitudinal direction of the cells 100 is aligned with the width direction of the power battery pack. The plurality of cells 100 are arranged in the longitudinal direction of the power battery pack 10. The cells 100 are arranged to form a battery array, and the length L of the cells 100 is 400 mm to 1500 mm. The battery includes a battery body 110 having a size of 100 mm.

[0090] In some embodiments of the present application, the cell 100 includes a battery body 110, and the power battery The length L of the battery body 110 in the width direction of the pack 10 and the width W of the vehicle body are set to 46%≦L / W≦ In the above embodiment, only one pack body 200 is provided along the width direction of the vehicle body. In other possible embodiments, this can be achieved by providing a In this case, in some embodiments, the length L of the battery body 110 is 2000 mm to 2500 mm. mm. Generally, for most vehicles, the width W of the body is 500mm to 2000mm. m, for example, 500mm, 1600mm, 1800mm, 2000mm, and the length of the car body The width of a passenger car is generally 500mm~5200mm. ~1800mm, and the length of the vehicle body is 500mm~5200mm, for example, 2000 mm, 2500mm, 3000mm, 3500mm, 4000mm, 4500mm, 47 00mm, 5000mm, 5200mm, and the body length is 500mm~5000mm It may be 500 mm to 4700 mm.

[0091] According to some specific embodiments of the present application, the electric vehicle 1 includes: The power battery pack 10 is provided at the bottom, and the power battery pack 10 is is along the width direction of the body of the electric vehicle 1 and the longitudinal direction is along the The longitudinal direction of the single cell 100 is aligned with the longitudinal direction of the power battery pack 1. The plurality of cells 100 are arranged along the longitudinal direction of the power battery pack 10. The cells are arranged along the width direction of the cell array.

[0092] According to some specific embodiments of the present application, the electric vehicle 1 includes: The power battery pack 10 is provided at the bottom, and the power battery pack 10 is is along the width direction of the body of the electric vehicle 1 and the longitudinal direction is along the The longitudinal direction of the single cell 100 is aligned with the longitudinal direction of the power battery pack 1. The plurality of cells 100 are arranged along the longitudinal direction of the power battery pack 10. The cells 100 are arranged along the width direction of the cell array, and the length L of the cells 100 is 15 mm. It includes a battery body 110 that is 00 mm to 2500 mm.

[0093] According to some specific embodiments of the present application, the electric vehicle 1 includes: The power battery pack 10 is provided at the bottom, and the power battery pack 10 is is along the width direction of the body of the electric vehicle 1 and the longitudinal direction is along the The longitudinal direction of the single cell 100 is aligned with the longitudinal direction of the power battery pack 1. The plurality of cells 100 are arranged along the longitudinal direction of the power battery pack 10. The cells 100 are arranged along the width direction of the cell array, and the length L of the cells 100 is 20 It includes a battery body 110 that is 00 mm to 2500 mm.

[0094] According to some embodiments of the present application, the cell 100 includes a battery body 110, The length L of the battery body 110 in the longitudinal direction of the battery pack 10 and the length X of the vehicle body are such that: L / X≦76%.

[0095] In some other embodiments of the present application, the width F of the pack body 200 is 500 mm to 1500 mm. mm, which is larger than the battery case disclosed in the Chinese patent document CN107925028A. It is much larger and can accommodate a battery module 400 such as the CN107925028A battery pack. This helps ensure range and fits the vehicle dimensions.

[0096] In some embodiments of the present application, the cell 100 includes a cell body 110, The ratio of the length L of the vehicle 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 body. In a possible embodiment, if such dimensional requirements are met, a plurality of battery modules may be arranged longitudinally. This can be achieved by providing a battery 400 or a plurality of cells 100. In the example, the length L of the battery body 110 is 400 mm to 1500 mm.

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

[0098] As a result, compared to the prior art, the present invention is designed to have a longer cell size, with a maximum length of 2500m. m, and by applying the cell to a battery pack, the following technical effects can be achieved. can be achieved.

[0099] 1. Significant improvement in battery pack volume utilization rate and volumetric energy density: Currently, the volume utilization rate in the industry is about 40%, but with this design, the entire internal volume of the battery pack can be utilized. The battery can be placed on the body, and the volume utilization rate can be improved to over 60%, even up to 80%. The volumetric energy density of the battery is increased by more than 20%. By adopting this method, energy consumption will increase by 20% to 30% and the vehicle's driving range will also increase by 20%. It can be improved by ~30%.

[0100] 2. Significant reduction in battery pack costs: The cells themselves provide mechanical reinforcement, resulting in The reinforcing ribs of the battery tray can be omitted or reduced, and the manufacturing process of the battery pack can be simplified. The process is simple, the manufacturing cost is reduced, and the size of the cell according to the present invention is smaller than that of the battery pack. The dimensions allow the cells to be placed directly side-by-side in the battery pack, unlike the prior art. First, multiple cells are placed in a module frame surrounded by two end plates and two side plates. There is no need to arrange the battery modules side by side and then assemble them into a battery pack, and the single battery module according to the present invention can be used. The battery dimensions are long enough that multiple cells can be placed directly side-by-side in a battery pack. The battery module is assembled by fixing the end plates, side plates, and battery modules. The assembly process of the cells is simpler by eliminating or reducing the number of fasteners such as screws. This reduces the manufacturing costs of labor and materials, which is beneficial for the widespread adoption of electric vehicles. .

[0101] 3. Improved stability and reliability of battery packs: The more complicated the battery pack assembly process, the However, this increases the probability of defective products, and the battery pack may become loose and not be firmly attached. This will adversely affect the quality of the battery pack and reduce the stability and reliability of the battery pack. When the cells according to the present invention are assembled into a battery pack, the assembly process becomes simpler. , improve the stability and reliability of the battery pack, and reduce the defective rate of the battery pack.

[0102] 4. Significant improvement in heat dissipation safety of battery packs: The temperature rise of a battery pack is caused by both heat generation and heat dissipation. This is the result of using a single battery, and assuming the same capacity, the amount of heat generated by the single battery is constant. By designing it to be oblong, the heat dissipation effect of the unit cell is improved and the temperature rise of the unit cell is reduced. Under the premise that the operating conditions of the battery pack are constant, the battery pack is The reduced temperature also significantly improves the safety of the battery pack.

[0103] Based on the significant technical effect brought about by the long cell, the self-sustaining property of the cell is To achieve support for the body, improvements have been made to the molding process and structural design. By improving the support strength of the case and controlling the aspect ratio of the case within a specified range, In addition, the internal resistance of the cell can be reduced by optimizing the current collection path. In addition, by improving the injection process, the long dimensions of the single cell can be reduced. This also solves the problem of long injection times.

[0104] Below, Comparative Example 1 and Examples 1-2, Comparative Example 2 and Examples 3-4, Comparative Example 3 and Example 5 The power battery pack 10 according to the embodiment of the present application is described in the following paragraphs 1 to 6. The arrangement of the cells 100 and By designing the dimensional parameters, etc., the energy density and other aspects can be improved.

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

[0106] In Comparative Example 1, Example 1, and Example 2, the battery pack has a total volume of 213 L. The total volume occupied by the pack body, the internal battery management system and other power distribution modules is 58 L, which houses the actual remainder of the battery pack, the cells, cross beams and side beams The total volume is 155L, the volume of the distribution box is 22.5L, and the pack body is The battery pack is 1380mm long, 1005mm wide, and 137mm thick. is 213L = 1380 x 1005 x 137 x 0.000001 + 22.5. The width of the pond pack is aligned with the width of the vehicle body and the length of the pack is aligned with the length of the vehicle body. The width of the car body is 1880mm.

[0107] Comparative Example 1 As shown in FIG. 1, a power battery pack 10′ in the prior art includes a pack body 200″. There are two cross beams 500' and one side beam 600' inside, and two The cross beam 500' and one side beam 600' connect the single cells to the six battery packs 400. Each battery pack 400' has a side plate and an end plate.

[0108] Example 1 In the power battery pack 10 according to the embodiment of the present invention, as shown in FIG. are arranged so that their longitudinal direction is along the width direction B of the power battery pack, and a plurality of single cells 100 are The pack body 200 is arranged along the longitudinal direction A of the power battery pack 10. The battery pack 1 accommodates one cell 100 in the width direction B of the battery pack 1. Extending from one side to the other of the pack body 200 in the width direction B of the pack body 200. One cross beam 500 is provided in each side beam, and no side beams 600 are provided. The beam 500 extends along the width direction B of the power battery pack 10, and the plurality of cells 100 are , are arranged along the longitudinal direction A of the power battery pack 10 to form a battery array, The system 500 divides the battery array into two parts along the longitudinal direction A of the power battery pack 10. The first side panels of the pack body 200 located on both sides of the power battery pack 10 in the width direction B The frame 201 and the second side beam 202 provide support to the unit cell 100 and the power battery The first end beams 203 of the pack body 200 located at both ends of the pack 10 in the longitudinal direction A and the second end beam 204 provides an inward pressing force on the adjacent cells 100 . Within the pack body 200, a single layer of battery array is arranged along the height direction C of the power battery pack 10. The battery array (also understood as a battery module) of the power battery pack 10 includes end plates. and no side panels are provided.

[0109] Example 2 In the power battery pack 10 according to the embodiment of the present invention, as shown in FIG. are arranged so that their longitudinal direction is along the width direction B of the power battery pack, and a plurality of single cells 100 are The pack body 200 is arranged along the longitudinal direction A of the power battery pack 10. The battery pack 1 accommodates one cell 100 in the width direction B of the battery pack 1. Extending from one side to the other of the pack body 200 in the width direction B of the pack body 200. The cross beam 500 and the side beam 600 are not provided. The first side beam 201 and the second side beam 202 of the pack body 200 located on both sides in the width direction B The side beam 202 provides support to the cells 100 and supports the power battery pack 10 in the longitudinal direction A. The first end beam 203 and the second end beam 204 of the pack body 200 are located at both ends of the pack body 200. 204 provides an inward pressing force to the adjacent cells 100. The power battery pack 10 includes a battery array in one layer along the height direction C. The battery array (also understood as a battery module) of the battery pack 10 is provided with end plates and side plates. do not have.

[0110] As can be seen by comparing the above Comparative Example 1 with Examples 1 to 3, those skilled in the art Compared with the power battery pack 10' in the power battery pack 10 of the present invention, the power battery pack 10 of the present invention is The design of the arrangement, dimensional parameters and other factors of the reservoir 100 allows for space utilization efficiency that is comparable to that of conventional power plants. By overcoming the limitations of the battery pack, higher energy density can be achieved.

[0111] In Comparative Example 2, Example 3, and Example 4, the battery packs have a total volume of 283 L. The total volume occupied by the pack body, the internal battery management system and other power distribution modules is 89 L, and the actual remaining battery pack, single cells and / or cross beams, side beams The pack has a volume of 221L and measures 1380mm long and 1380mm wide. mm, thickness 137mm, the volume of the power distribution box is 11L, and the total battery pack The product is 310L = 1580 x 1380 x 137 x 0.000001 + 11. Power battery The pack is arranged so that its width direction is along the width direction of the vehicle body and its length direction is along the length direction of the vehicle body. The width of the car body is 1950mm.

[0112] Comparative Example 2 As shown in FIG. 1, a power battery pack 10′ in the prior art includes a pack body 200″. There are two cross beams 500' and one side beam 600' inside, and two The cross beam 500' and one side beam 600' connect the cells to six battery modules. Each battery module 400' has side plates and end plates. do.

[0113] Example 3 In the power battery pack 10 according to the embodiment of the present invention, as shown in FIG. are arranged so that their longitudinal direction is along the longitudinal direction A of the power battery pack, and a plurality of single cells 100 are arranged along the width direction B of the power battery pack 10, and the pack body 200 The battery pack accommodates one cell 100 in the longitudinal direction A of the battery pack. 10 in the longitudinal direction A from one side of the pack body 200 to the other side. 0, one side beam 600 is provided, and no cross beam 500 is provided, The side beams 600 extend along the longitudinal direction A of the power battery pack 10 and support the plurality of single cells 1. 00 are arranged along the width direction B of the power battery pack 10 to form a battery array, and The beam 600 divides the battery array into two parts along the width direction B of the power battery pack 10. The first ends of the pack body 200 located at both ends of the power battery pack 10 in the longitudinal direction A are The first end beam 203 and the second end beam 204 provide support to the cell 100 and The first side beams 20 of the pack body 200 located on both sides of the width direction B of the battery pack 10 The first and second side beams 202 provide an inward pressing force to the adjacent cells 100. Within the pack body 200, a single layer of battery array is arranged along the height direction C of the power battery pack 10. The power battery pack 10 includes a battery array (also understood as a battery module) No plates or side panels are provided.

[0114] Example 4 In the power battery pack 10 according to the embodiment of the present invention, as shown in FIG. are arranged so that their longitudinal direction is along the longitudinal direction A of the power battery pack, and a plurality of single cells 100 are arranged along the width direction B of the power battery pack 10, and the pack body 200 The battery pack accommodates one cell 100 in the longitudinal direction A of the battery pack. 10 in the longitudinal direction A from one side of the pack body 200 to the other side. 0 does not have a cross beam 500 and a side beam 600. The first end beams 203 of the pack body 200 located at both ends of the pack 10 in the longitudinal direction A and The two end beams 204 provide support for the cells 100 and extend across the width of the power battery pack 10. The first side beam 201 and the second side beam 202 of the pack body 200 located on both sides of the direction B The arms 202 provide an inward pressing force to the adjacent cells 100. The power battery pack 10 includes a battery array in one layer along the height direction C of the power battery pack 10. The battery pack 10 has a battery array (also known as a battery module) provided with end plates and side plates. Not yet.

[0115] The battery packs in Comparative Example 3, Example 5, and Example 6 have a total volume of 414 L. The total volume occupied by the pack body, the internal battery management system and other power distribution modules is 5 8L, and the actual remaining battery pack, single battery and / or cross beam, side beam The pack has a volume of 356L and measures 2130mm long and 138mm wide. 0mm, thickness 137mm, volume of the power distribution box 11L, total battery pack The volume is 414L = 2130 x 1380 x 137 x 0.000001 + 11. The width of the pond pack is aligned with the width of the vehicle body and the length of the pack is aligned with the length of the vehicle body. The body length is 4700mm.

[0116] Comparative Example 3 In this example, the arrangement of the cells 100 in the battery pack 10 is the same as that in Comparative Example 1. It is the same as the method.

[0117] Example 5 In this embodiment, the arrangement of the cells 100 in the battery pack 10 is the same as that in the fifth embodiment. It is the same as the method.

[0118] Example 6 In this embodiment, the power battery pack 10 has a total volume of 508 L, and the pack body 20 The total volume occupied by the battery management system and other power distribution modules is 119L. The actual remaining cells and / or cross beams and side beams of the power battery pack 10 are The volume that can accommodate the pack is 389L, the length of the car body is 5200mm, and the pack body The 200'' is 2630mm long, 1380mm wide, and 137mm thick. The pond is 2500mm long, 118mm wide and 13.5mm high. The rack is arranged so that its width direction is along the width direction of the vehicle body and its length direction is along the length direction of the vehicle body. The length of the vehicle body is 5200 mm. In this example, the arrangement of the cells in the battery pack is The method is the same as the arrangement method in the fifth embodiment.

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

[0120] [Table 1]

[0121] As can be seen by comparing the above Comparative Example 1 with Examples 1 and 2, those skilled in the art Compared with the power battery pack 10' in the power battery pack 10 of the present invention, the power battery pack 10 of the present invention is The arrangement of the cells 100, the dimensional parameters and other factors, such as the length of the cells and the width of the vehicle body, The ratio of the length of the single cell to the length of the vehicle body in the longitudinal direction is also used to design the single cell. This allows for full utilization of the space in the vehicle body in the extension direction of the pond, achieving higher energy density.

[0122] As will be understood by those skilled in the art by comparing the above Comparative Example 2 with Examples 3 and 4, the examples of the present application The power battery pack 10 according to the present invention is configured by adjusting the arrangement, dimensional parameters and other factors of the cells 100, e.g. For example, the ratio of the length of a single cell to the width of the vehicle body or the ratio of the length of a single cell to the length of the vehicle body Higher energy density can be achieved by designing the ratio of dimensions to the The improvement in energy density is magnified by the increase in the total volume of the power battery pack; The larger the volume of the battery pack, the greater the effect of improving the energy density by the technical means of the embodiment of the present application. becomes more pronounced.

[0123] As will be understood by those skilled in the art by comparing the above Comparative Example 3 with Examples 5 and 6, the examples of the present application The power battery pack 10 according to the present invention is configured by adjusting the arrangement, dimensional parameters and other factors of the cells 100, e.g. For example, the ratio of the length of a single cell to the width of the vehicle body or the ratio of the length of a single cell to the length of the vehicle body The design of the ratio of dimensions etc. allows for sufficient use of the space in the vehicle body in the extension direction of the single cell, If the dimensions are constant, a higher energy density can be achieved in this application.

[0124] In the description of this specification, descriptions that refer to the terms "specific example," "specific example," etc. The specific features, structures, materials or characteristics described in combination with the examples are not intended to be limiting of the present application. It means that the term is included in at least one embodiment or example. Illustrative expressions are not necessarily limited to the same embodiment or example.

[0125] While embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that the principles and Various changes, modifications, substitutions and variations may be made to these embodiments without departing from the spirit of the invention. The scope of this application is limited by the claims and their equivalents.

Claims

1. A power battery pack for powering an electric vehicle, comprising: The pack itself, a plurality of unit cells provided in the pack body; The cell has a length L 0 , a width H 0 , and a thickness D 0 , where L 0 >H 0 ≧D 0 ; When the power battery pack is disposed in the electric vehicle, the lengthwise direction of each of the cells extends along the widthwise or lengthwise direction of the electric vehicle, When the longitudinal direction of the unit cell extends along the width direction of the electric vehicle, the length L 0 of the unit cell and the dimension W in the width direction of the body of the electric vehicle satisfy 46%≦L 0 / W≦76%, or When the longitudinal direction of the unit cells extends along the longitudinal direction of the electric vehicle, the length L 0 of the unit cells and the dimension X of the electric vehicle body in the longitudinal direction satisfy the relationship 40%≦L 0 / X≦76%; Each cell includes a battery body, the battery body having a length L, a width H, a thickness D, and a volume V, the length L of the battery body being greater than the width H, and the width H of the battery body being greater than the thickness D; The battery body is 400 mm≦L≦2500 mm, and H / V=0.0001mm －２ ~0.00015mm －２ Charge the power battery pack.

2. 2. The power battery pack according to claim 1, wherein the single cells satisfy the relationship 400 mm≦L≦1500 mm.

3. 2. The power battery pack according to claim 1, wherein the single cells satisfy 1500 mm≦L≦2500 mm.

4. The single cell has a L / V of 0.0005 mm －２ ~0.002mm －２ The power battery pack according to claim 1 , wherein

5. The single cell has an L / V of 0.00045 mm －２ ~0.0015mm －２ The power battery pack according to claim 1 , wherein

6. 2. The power battery pack according to claim 1, wherein the length L and width H of the battery body satisfy L / H=4 to 21.

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

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

9. The thickness D of the battery body and the volume V of the battery body are D / V = 0.0000065 mm －２ ~0.00002mm －２ The power battery pack according to claim 1 , wherein

10. The length L of the battery body and the surface area S of the battery body are L / S = 0.002 mm －１ ~0.005mm －１ The power battery pack according to claim 1 , wherein

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

12. The length L of the battery body and the energy E of the battery body are L / E = 1.65 mm Wh －１ ~2.45mm・Wh －１ The power battery pack according to claim 1 , wherein

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

14. The volume V of the battery body and the energy E of the battery body are V / E≦2000 mm ３ ・Wh －１ The power battery pack according to claim 1 , wherein

15. 2. The power battery pack according to claim 1, wherein the unit cells are aluminum-cased prismatic cells, and include a battery body and an explosion-proof valve, the explosion-proof valve being provided at least at one end of the battery body in the longitudinal direction.

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

17. An electric vehicle comprising the power battery pack of claim 1.

18. 18. The electric vehicle according to claim 17, wherein the power battery pack is provided at the bottom of the electric vehicle, and the pack body is fixedly connected to a chassis of the electric vehicle.

19. 19. The electric vehicle according to claim 18, wherein the electric vehicle includes one power battery pack provided at the bottom of the electric vehicle, the power battery pack being arranged so that its width direction is along the width direction of a body of the electric vehicle and its length direction is along the length direction of the body of the electric vehicle, and the single battery is arranged so that its length direction is along the width direction of the power battery pack.

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