CN112271392B

CN112271392B - Power battery pack, energy storage device and electric vehicle

Info

Publication number: CN112271392B
Application number: CN202011030916.3A
Authority: CN
Inventors: 何龙; 孙华军; 江文锋; 鲁志佩; 郑卫鑫; 唐江龙; 朱燕; 王信月; 何科峰
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-01-09
Filing date: 2019-06-21
Publication date: 2023-05-09
Anticipated expiration: 2039-06-21
Also published as: CN112201895A; CN112271391A; CN112271393B; CN110379962B; CN112201895B; CN112271392A; CN112271391B; CN110379962A; CN112271393A

Abstract

The disclosure relates to a power battery package, energy memory and electric motor car, this power battery package include accommodate device (200) and set up a plurality of battery cells (100) in accommodate device (200), accommodate device (200) are including first frame (201) and second frame (202) that set up relatively along first direction (A1), a plurality of battery cells (100) set up between first frame (201) and second frame (202), and follow first direction (A1), be provided with two battery cells (100) between first frame (201) and second frame (202). Through above-mentioned technical scheme, set up two battery cells along first direction to accessible battery cell itself plays crossbeam and/or the effect of indulge the roof beam, improves accommodation device's volume utilization ratio.

Description

Power battery pack, energy storage device and electric vehicle

The application is a divisional application with the application date of 2019-06-21, the application number of 201910544943.3 and the application name of power battery pack, energy storage device and electric vehicle.

Technical Field

The disclosure relates to the technical field of power battery packs, in particular to a power battery pack, an energy storage device and an electric vehicle.

Background

In the prior art, the power battery package mainly includes accommodation device and installs a plurality of battery module in accommodation device, and battery module mainly is assembled by a plurality of battery cells, and accommodation device generally includes bottom plate and boundary beam, and the boundary beam sets up around the bottom plate. In order to make the accommodating device have enough strength and facilitate the installation of the battery modules, a plurality of cross beams and longitudinal beams are generally arranged between the side beams, and a plurality of accommodating spaces for accommodating the battery modules are jointly defined by the cross beams, the longitudinal beams, the side beams and the bottom plate, and each battery module is arranged in the corresponding accommodating space.

The power battery pack at least has the following disadvantages:

1. due to the existence of the cross beam and the longitudinal beam, the volume utilization rate of the accommodating device is low, the volume utilization rate is about 40%, the number of mountable single batteries is limited, and the cruising ability of the power battery pack cannot be effectively improved;

2. in the traditional power battery pack, a plurality of battery modules are contained, each battery module and a cross beam are required to be fixed in the assembly process, a large number of fasteners such as screws are required to be used for fastening the modules, and meanwhile, the cross beam or the longitudinal beam has a certain weight, so that the weight of the accommodating device is increased;

3. The transverse beam and the longitudinal beam are arranged in the accommodating device, so that the structure is complex, and the complexity of the manufacturing process of the accommodating device is increased;

4. the single battery needs to be assembled into the battery module and then is arranged in the accommodating device, the operation steps are complex, and if the single battery is directly placed in the accommodating device, the cross beam and the longitudinal beam in the accommodating device are easy to collide with the single battery, so that the single battery is damaged.

Disclosure of Invention

The utility model provides an object provides a power battery package, energy memory and electric motor car, this power battery package can improve accommodating device's volume utilization ratio effectively to reduce accommodating device's weight, thereby improve power battery package's duration and realize power battery package's lightweight.

In order to achieve the above object, a first aspect of the present disclosure provides a power battery pack, including a housing device and a plurality of battery cells disposed in the housing device, the housing device includes a first frame and a second frame disposed opposite along a first direction, the plurality of battery cells are disposed between the first frame and the second frame, and along the first direction, two battery cells are disposed between the first frame and the second frame.

Optionally, the accommodating device is a vehicle tray.

Optionally, the accommodating device is formed on an electric vehicle.

Optionally, the accommodating device is a cavity recessed downward.

Optionally, the cavity includes a first side wall and a second side wall opposite to each other, the first frame is the first side wall of the cavity and an extension portion of the first side wall, and the second frame is the second side wall of the cavity and an extension portion of the second side wall.

Optionally, the extension of the first sidewall and the extension of the second sidewall form a bottom of the cavity.

Optionally, the single battery is perpendicular to the first frame and the second frame, and a length of the single battery along the first direction is a distance between a first end and a second end of the single battery.

Optionally, a plurality of the unit cells are arranged along a second direction different from the first direction.

Optionally, the power battery pack is provided with a plurality of layers of the plurality of single batteries along a third direction, and the plurality of single batteries in each layer are located between the first frame and the second frame.

Optionally, each unit cell is disposed with the first direction as a length direction.

Optionally, the accommodating device includes a third frame and a fourth frame disposed opposite to each other along a second direction different from the first direction, and the plurality of unit cells are arranged between the third frame and the fourth frame along the second direction.

Optionally, the third frame applies a force towards the fourth frame to the single battery disposed adjacent to the third frame, and the fourth frame applies a force towards the third frame to the single battery disposed adjacent to the fourth frame.

Optionally, a first elastic buffer plate is disposed between the third frame and the unit cell adjacent to the third frame, and/or a second elastic buffer plate is disposed between the fourth frame and the unit cell adjacent to the fourth frame.

Optionally, a first side plate is disposed on a side, facing the third frame, of the single battery adjacent to the third frame, and a second side plate is disposed on a side, facing the fourth frame, of the single battery adjacent to the fourth frame.

Optionally, a first end plate is disposed between the first end of at least some of the plurality of unit cells and the first frame; a second end plate is arranged between the second end of at least part of the single batteries and the second frame, and the first end plate, the second end plate, the first side plate, the second side plate and the at least part of the single batteries form a battery module.

Optionally, a module top plate is arranged above at least part of the single batteries, the module top plate is connected with the first end plate, and the module top plate is connected with the second end plate; the module top plate, the first end plate, the second end plate and the at least part of single batteries form the battery module.

Optionally, a module bottom plate is arranged above and below at least part of the single batteries in the plurality of single batteries, the module bottom plate is connected with the first end plate, and the module bottom plate is connected with the second end plate; the module bottom plate, the first end plate, the second end plate and at least part of the single batteries form the battery module.

Optionally, a module top plate is arranged above at least part of the single batteries, and a module bottom plate is arranged below at least part of the single batteries; the first end plate, the second end plate, the first side plate, the second side plate, the module top plate, the module bottom plate and at least part of the single batteries form the battery module.

Optionally, the battery modules are at least two along a second direction different from the first direction.

Optionally, the power battery pack is provided with a plurality of layers of the battery modules along a third direction.

Optionally, a heat insulation layer is arranged between the module bottom plate and the single battery.

Optionally, a heat conducting plate is arranged between the module top plate and the single battery.

Optionally, the module roof is the liquid cooling board or the direct cooling board that are provided with cooling structure inside.

Optionally, the length of the single battery along the first direction is 500mm-1000mm.

Optionally, the unit cells are square cells with a cuboid structure, and have a length, a thickness and a height between the length and the thickness, each unit cell is placed on edge, the length direction of each unit cell is in the first direction, the thickness direction is in the second direction, the height direction is in the third direction, and two adjacent unit cells are arranged in a large-surface-facing manner.

Optionally, the single battery is a square battery with a metal shell.

Optionally, a first electrode of the single battery is led out from the single battery towards the first end of the first frame, and a second electrode of the single battery is led out from the single battery towards the second end of the second frame.

Optionally, the length of the single battery is L, and the thickness of the single battery is D, wherein the ratio of L to D satisfies 50-70L/D.

Optionally, the surface area of the single battery is S, and the volume of the single battery is V, wherein the ratio of S to V satisfies 0.15-0.2.

Optionally, the surface area of the single battery is S, and the energy of the single battery is E, wherein the ratio of S to E satisfies that S/E is more than or equal to 250 and less than or equal to 400.

Optionally, the first direction is a vehicle body width direction, and the second direction is a vehicle body length direction; alternatively, the first direction is a longitudinal direction of the vehicle body.

A second aspect of the present disclosure provides an electric vehicle including the power battery pack of any one of the first aspects.

Optionally, the power battery pack is arranged at the bottom of the electric vehicle, and the accommodating device is fixedly connected with the chassis of the electric vehicle.

Optionally, the electric vehicle comprises a power battery pack arranged at the bottom of the electric vehicle, the accommodating device is fixedly connected with the chassis of the electric vehicle, the first direction is the width direction of the electric vehicle, and the second direction is the length direction of the electric vehicle.

Optionally, the width of the accommodating device in the first direction is L3, and the width of the vehicle body is W, where the ratio of L3 to W satisfies: L3/W is more than or equal to 50% and less than or equal to 80%.

Optionally, the length of the single battery in the first direction is L4, and the width of the vehicle body is W, where the ratio of L4 to W satisfies: L4/W is more than or equal to 40% and less than or equal to 70%.

A third aspect of the present disclosure provides an energy storage device comprising the power cell pack of any one of the first aspects.

Through above-mentioned technical scheme, in this disclosure, along the first direction, only set up two battery cells between first frame and the second frame, battery cell itself can play the effect of crossbeam and/or longeron, thereby reduce the use of crossbeam and/or longeron in the holding device, can not use crossbeam and/or longeron in the holding device even, thereby reduce the space that crossbeam and/or longeron occupy in the holding device, the space utilization of holding device has been improved, make more battery cells can arrange in holding device as far as possible, and then the capacity of whole power battery package, voltage and duration are improved. For example, in an electric vehicle, the design can improve the space utilization rate from about 40% to more than 60% or even higher, such as 80%.

And, owing to need not to arrange crossbeam and/or longeron in the accommodate device again, on the one hand for accommodate device's manufacturing process has been simplified, and single battery's equipment complexity reduces, and manufacturing cost reduces, on the other hand makes accommodate device and whole power battery package's weight lighten, has realized the lightweight of power battery package. Particularly, when the power battery pack is installed on the electric vehicle, the cruising ability of the electric vehicle can be improved, and the light weight of the electric vehicle is realized.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

fig. 1 is an exploded view of a power cell pack provided in the prior art;

fig. 2 is a schematic perspective view of a unit cell according to an embodiment of the present disclosure;

fig. 3 is a schematic perspective view of a power battery pack according to an embodiment of the present disclosure;

fig. 4 is a schematic view illustrating an arrangement of a plurality of unit cells in a receiving device according to an embodiment of the present disclosure;

FIG. 5 is a schematic perspective view of a containment device provided in one embodiment of the present disclosure;

fig. 6 is a schematic perspective view of a receiving device according to another embodiment of the present disclosure;

fig. 7 is a schematic perspective view of a receiving device according to still another embodiment of the present disclosure;

FIG. 8 is an enlarged view of portion A of FIG. 7;

FIG. 9 is a cutaway perspective view of a power battery pack provided by one embodiment of the present disclosure;

FIG. 10 is an enlarged view of portion B of FIG. 9;

Fig. 11 is a cross-sectional view of a power battery pack provided by another embodiment of the present disclosure, wherein the first and second rims are not shown;

FIG. 12 is an exploded view of a power cell pack provided by one embodiment of the present disclosure;

FIG. 13 is a schematic perspective view of a first side panel or a second side panel according to one embodiment of the present disclosure;

FIG. 14 is a schematic perspective view of a first end plate or a second end plate provided in one embodiment of the present disclosure;

fig. 15 is a schematic perspective view of a power battery pack according to an embodiment of the present disclosure, in which a plurality of battery modules are provided;

FIG. 16 is a schematic perspective view of a housing (cavity) formed on an electric vehicle according to one embodiment of the present disclosure;

FIG. 17 is a schematic plan view of a liquid cooling plate according to one embodiment of the present disclosure;

FIG. 18 is a schematic plan view of a liquid cooling plate according to another embodiment of the present disclosure;

FIG. 19 is a schematic plan view of a liquid cooling plate according to still another embodiment of the present disclosure

FIG. 20 is a cross-sectional view of a cavity provided by one embodiment of the present disclosure;

fig. 21 is a perspective view showing a housing device (a tray for a vehicle) provided in an embodiment of the present disclosure being fixed to an electric vehicle;

FIG. 22 is an exploded view of an embodiment of the present disclosure providing an electric vehicle containment device (vehicle tray) secured to an electric vehicle;

fig. 23 is a schematic perspective view of a power battery pack according to still another embodiment of the present disclosure, in which the battery modules are multiple and multilayered.

Description of the reference numerals

100. First electrode of single battery 101

102. Explosion-proof valve of second electrode 103

200. First frame of accommodation device 201

202. Third frame of second frame 203

204. Fourth frame 205 first elastic buffer plate

206. Second elastic buffer plate 207 first end plate

208. Second end plate 209 first side plate

210. Second side plate 211 module bottom plate

212. First supporting step of module top plate 213

214. Second support step 215 first fixing portion

216. Second fixing portion 217 heat insulating layer

218. Heat conduction layer 219 liquid cooling plate

220. Direct cooling plate 221 air inlet

222. Gas-liquid separator of exhaust passage 223

224. Cooling liquid inlet of cooling liquid pipeline 225

226. Cooling liquid outlet 227 liquid inlet manifold

228. Liquid outlet manifold 229 coolant inlet

230. Total outlet of cooling liquid

300. First sidewall of cavity 301

302. Bottom of the cavity of the second sidewall 305

400. Battery module 500 crossbeam

600. Longitudinal beam

A1 First direction A2 second direction

A3 Third direction of

Length of L cell D thickness of cell

Height of H single battery

Distance between first end and second end of L1 single battery/length of single battery along first direction

Distance between inner surface of L2 first frame and inner surface of second frame/distance between first side wall and second side wall along first direction

Width of L3 accommodation device in first direction

Length of the L4 unit cell in the first direction.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In the present disclosure, unless otherwise indicated, directional terms such as "upper, lower, left, right, top, bottom" and the like are used for the purpose of describing the present invention and simplifying the description based on the azimuth and positional relationships shown in the drawings, but do not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention, and furthermore, "inside, outside" refers to the inside and outside of the outline of the corresponding structure.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or the number of technical features indicated.

In addition, in the present disclosure, the azimuth terms "front, rear, left, and right" generally refer to front, rear, left, and right of the vehicle itself, specifically, the direction toward the left wheel is left, the direction toward the right wheel is right, the direction toward the vehicle head is front, and the direction toward the vehicle tail is rear.

As shown in fig. 2 to 23, according to an aspect of the present invention, there is provided a power battery pack including a receiving device 200 and a plurality of unit batteries 100 disposed in the receiving device 200, each unit battery 100 including opposite first and second ends, the receiving device 200 including first and

second rims

201 and 202 disposed opposite in a first direction A1, the plurality of unit batteries 100 being disposed between the first and

second rims

201 and 202, the first end of each unit battery 100 being supported at the first rim 201 and the second end of each unit battery 100 being supported at the second rim 202 in one embodiment.

In other words, each unit cell 100 extends between the first and

second frames

201 and 202, and the plurality of unit cells 100 are arranged along the length direction of the first and

second frames

201 and 202, that is, along the second direction A2. Alternatively, the number of the accommodating devices 200 may be plural or one.

Here, the first and second ends of the unit cells 100 are supported on the first and

second frames

201 and 202, respectively, and the unit cells 100 may be directly supported by the first and

second frames

201 and 202, that is, placed on the first and

second frames

201 and 202, respectively, or may be further fixed to the first and

second frames

201 and 202, respectively, and specific fixing manners are described in detail below, and the disclosure is not limited thereto.

Under the technical concept of the present disclosure, in one embodiment, the distance between the first frame 201 and the second frame 202 along the first direction A1 is matched with the size of the unit cell 100, where the matching means that the space between two frames or two side walls in the following can be matched to install one unit cell 100, and such matching may be various matching manners such as clearance matching, interference matching, fastening matching, fixing matching, and the like, so as to achieve the purpose of the present disclosure.

In some embodiments of the present disclosure, a first end of each unit cell 100 may be directly or indirectly supported on the first frame 201, and a second end of each unit cell 100 may be directly or indirectly supported on the second frame 202. Direct means that the first end of the single battery 100 is supported by direct contact fit with the first frame 201, and the second end of the single battery 100 is supported by direct contact fit with the second frame 202; by indirect it is meant, for example, that in some embodiments, a first end of cell 100 is supported by first end plate 207 in cooperation with first frame 201 and a second end of cell 100 is supported by second end plate 208 in cooperation with second frame 202.

It should be noted that the first frame 201 and the second frame 202 are disposed opposite to each other, and the first frame 201 may be parallel to each other, or may be disposed at an angle, or may be a straight line structure or a curved line structure. The unit cells 100 may be perpendicular to the first frame 201 and/or the second frame 202, or disposed at an acute angle or an obtuse angle to the first frame 201 and/or the second frame 202, for example, when the first frame 201 and the second frame 202 are parallel to each other, the first frame 201, the second frame 202, and the unit cells 100 may form a rectangular, square, or parallelogram, sector, or other structure; when the first frame 201 and the second frame 202 are angled, the first frame 201, the second frame 202, and the unit cell 100 may form a trapezoid, a triangle, or the like. The present disclosure does not limit the angular relationship between the first frame 201 and the second frame 202, and the angular relationship between the unit cell 100 and the first frame 201 and the second frame 202.

The first frame 201 and the second frame 202 are located at opposite sides of the receiving device 200 along the first direction A1, which means that, as shown in fig. 3, the first frame 201 and the second frame 202 are located at the most side of the receiving device 200 along the first direction A1, and the first frame 201 and the second frame 202 are the most external side of the receiving device 200.

In addition, the above-mentioned "first end" and "second end" of the unit cell 100 are used to describe the orientation of the unit cell 100, and are not used to define and describe the specific structure of the unit cell 100, for example, the first end and the second end are not used to define and describe the positive and negative poles of the unit cell 100, that is, in the present disclosure, the unit cell 100 is supported at one end of the first frame 201 as the first end, and the unit cell 100 is supported at one end of the second frame 202 as the second end.

In the prior art, because the size of the single battery is smaller and the length is shorter, the opposite ends of the single battery cannot be matched with the two side beams oppositely arranged in the accommodating device, and therefore, the cross beam 500 and/or the longitudinal beam 600 (as shown in fig. 1) are required to be arranged in the accommodating device, so that the assembly of the single battery is facilitated. When the unit cells are mounted in the receiving device through the battery module, there may be a plurality of unit cells in the first direction of the receiving device, that is, the unit cells do not extend between two oppositely disposed side rails (the first and

second frames

201 and 202, or the first and second side walls 301 and 302) but extend between two oppositely disposed cross members 500 or side members 600, and the battery module is fixed to the adjacent cross members 500 and/or side members 600 through fasteners.

Because the accommodating device in the prior art is provided with the cross beams and/or the longitudinal beams, the cross beams and/or the longitudinal beams occupy a large amount of installation space for accommodating the single batteries in the accommodating device, so that the volume utilization rate of the accommodating device is lower, generally, the volume utilization rate of the accommodating device is about 40 percent and even lower, that is, only about 40 percent of the space in the accommodating device in the prior art can be used for installing the single batteries, the number of the single batteries which can be accommodated in the accommodating device is limited, the capacity and the voltage of the whole power battery pack are limited, and the cruising ability of the power battery pack is poor.

However, in the present disclosure, the unit battery 100 extends between the first frame 201 and the second frame 202 of the accommodating device 200 opposite to each other, the first end and the second end of the unit battery 100 may be adapted to the first frame 201 and the second frame 202, and the unit battery 100 may be supported on the first frame 201 and the second frame 202, so that the use of the cross beam and/or the longitudinal beam in the accommodating device 200 is reduced, and even the cross beam and/or the longitudinal beam in the accommodating device 200 may not be used, so that the space occupied by the cross beam and/or the longitudinal beam in the accommodating device 200 is reduced, the space utilization of the accommodating device 200 is improved, and more unit batteries 100 may be arranged in the accommodating device 200 as much as possible, thereby improving the capacity, the voltage and the cruising ability of the whole power battery pack. For example, in an electric vehicle, the design can improve the space utilization rate from about 40% to more than 60% or even higher, such as 80%.

Moreover, since the transverse beams and/or the longitudinal beams are not required to be arranged in the accommodating device 200, on one hand, the manufacturing process of the accommodating device 200 is simplified, the assembly complexity of the single battery 100 is reduced, the production cost is reduced, and on the other hand, the weight of the accommodating device 200 and the whole power battery pack is reduced, so that the light weight of the power battery pack is realized. Particularly, when the power battery pack is installed on the electric vehicle, the cruising ability of the electric vehicle can be improved, and the light weight of the electric vehicle is realized.

In addition, compared with the single battery 100 in the prior art, the single battery 100 provided by the present disclosure extends between the first frame 201 and the second frame 202, two ends of the single battery 100 are respectively supported on the first frame 201 and the second frame 202, the single battery 100 can be used as a cross beam or a longitudinal beam for reinforcing the structural strength of the accommodating device 200, that is, the accommodating device 200 does not need to be provided with a reinforcing structure for reinforcing the structural strength, the structural strength of the accommodating device 200 can be ensured by directly replacing the reinforcing structure by the single battery 100, and the accommodating device 200 is not easy to deform under the action of external force. Moreover, under the condition of constant volume, because the size of the single battery is smaller and the length is shorter in the prior art, the opposite ends of the single battery cannot be matched with two side beams (such as the first frame 201 and the second frame 202 or the first side wall 301 and the second side wall 302 in fig. 3) which are oppositely arranged in the accommodating device; because the length of the single battery 100 along the first direction A1 in the present disclosure is longer, the thickness of the single battery 100 along the second direction A2 different from the first direction A1 can be made thinner, so that the surface area of the single battery 100 is larger than that of the single battery in the prior art, thereby increasing the heat dissipation area of the single battery 100, improving the heat dissipation rate of the single battery 100, further improving the safety of the whole power battery pack, and making the power battery pack safer and more reliable.

On the one hand, the fixed connection mode can support the single battery in the third direction; on the other hand, the fixed connection mode can improve the stability and the firmness of the whole structure.

In some exemplary embodiments provided by the present disclosure, each unit cell 100 is fixed at a first end to the first frame 201 and at a second end to the second frame 202. Here, there are various fixing methods, for example, a first end of each unit cell 100 is detachably fixed to the first frame 201 by a fastener, and a second end is detachably fixed to the second frame 202 by a fastener; alternatively, the first end and the second end of each unit cell 100 are respectively fixed on the first frame 201 or the second frame 202 by welding; alternatively, the first end and the second end of each unit cell 100 are respectively fixed on the first frame 201 or the second frame 202 by dispensing. The specific fixing manner of the first and second ends of the unit battery 100 and the first and

second frames

201 and 202 is not limited in the present disclosure.

In one embodiment of the present disclosure, the receiving device 200 is a vehicle tray, which is a separately manufactured vehicle tray for receiving and mounting the battery cells 100. As shown in fig. 20 and 21, when the battery cell 100 is mounted in the vehicle tray, the vehicle tray may be mounted to a vehicle body by a fastener, for example, hung on a chassis of an electric vehicle.

In the tray for a vehicle, since the vehicle body width is large, for example, in the range of 1.2m to 2m; longer, such as between 2m and 5m; the corresponding vehicle body width and vehicle body length are different for different vehicle models. The larger width and length of the vehicle body lead the overall size requirement of the tray arranged at the bottom of the vehicle body to be larger; the larger tray size results in that in the prior art, besides the side frame arranged on the side, a beam is also required to be arranged inside the tray, so that enough supporting force and structural strength can be provided for the single battery arranged inside. After the cross beam is added into the vehicle tray, the weight and the internal space of the whole vehicle tray are occupied, so that the space which can be effectively utilized is lower in the tray; meanwhile, due to the existence of the cross beam, a plurality of battery modules are required to be arranged in the width and length directions of the tray for being matched with the cross beam for installation, the installation is complex, and required installation structural members are more.

Then, if the cross beam is to be removed, the module layout and the cell layout in the prior art cannot provide sufficient structural strength for the battery module, and the tray cannot provide sufficient bearing force.

In the present disclosure, the two ends of the unit cell 100 are supported on the first and

second frames

201 and 202, and the weight of the unit cell is decomposed to tray frames on both sides; on the basis of removing the cross beam, the bearing capacity of the tray is effectively improved; meanwhile, the single battery 100 can be used as an integral reinforcing structure of the power battery pack, so that the integral structural strength of the power battery pack is improved.

In some embodiments, when the power battery pack is used as a power battery pack for supplying electric power for use on a vehicle, the first direction A1 of the unit battery 100 may be a width direction of the vehicle, i.e., a left-right direction of the vehicle, and as an alternative embodiment, the length of the unit battery 100 along the first direction A1 may be 500mm-1000mm, so that the length of the unit battery 100 can be adapted to the width of the vehicle.

In another embodiment provided in the present disclosure, as shown in fig. 16, the above-described receiving device 200 may also be directly formed on the electric vehicle, that is, the receiving device 200 is a device for mounting the unit battery 100 formed at any appropriate position on the electric vehicle. For example, the receiving device 200 may be formed on a chassis of an electric vehicle.

In this embodiment, along the first direction A1, the receiving device has a first frame 201 and a second frame 202 disposed opposite to each other, wherein a distance between the first frame 201 and the second frame 202 and a distance between a first end and a second end of the unit cell 100 in the first direction are matched, and the matching means that a space between two frames or two sidewalls described below can be matched to mount one unit cell 100, and such matching may be a gap fit, an interference fit, a fastening fit, a fixing fit, or other various matching manners, so as to achieve the purpose of the present disclosure.

In some embodiments, the receiving device 200 may be a cavity 300 recessed downward to facilitate assembly of the battery cells 100, alternatively, the receiving device 200 may be integrally formed with a chassis of the electric vehicle and formed as a cavity 300 recessed downward from the chassis.

In one embodiment provided in the present disclosure, the cavity 300 may include a first side wall 301 and a second side wall 302 disposed opposite to each other, and optionally, the first frame 201 and/or the second frame 202 may be extended downward from a chassis of the electric vehicle. The first frame 201 is a first sidewall 301 of the cavity 300 and an extension portion of the first sidewall 301, and the second frame 202 is a second sidewall 302 of the cavity 300 and an extension portion of the second sidewall 302. Thus, as an alternative embodiment, a first end of the cell 100 may be supported on an extension of the first sidewall 301 and a second end of the cell 100 may be supported on an extension of the second sidewall 302. That is, the present disclosure also provides an electric vehicle capable of arranging the unit batteries 100 according to the above-described technical scheme, in which the cavity 300 having the same characteristics as the separate vehicle tray is formed, thereby constructing the battery receiving device 200 provided by the present disclosure.

In some embodiments, in an exemplary embodiment provided by the present disclosure, the extension of the first sidewall 301 and the extension of the second sidewall 302 form the bottom 305 of the cavity 300, and in an embodiment, the extension of the first sidewall 301 is connected to the extension of the second sidewall 302, so that the cavity 300 is formed as a cavity 300 having a U-shaped groove recessed downward, and the unit cell 100 may be supported by the bottom 305 of the cavity 300. In another embodiment, the extension of the first sidewall 301 may also be spaced a distance from the extension of the second sidewall 302.

Referring back to fig. 3 to 6, in some embodiments, the single battery 100 is perpendicular to the first frame 201 and the second frame 202, the distance between the first end and the second end of the single battery 100 is L1, and the distance between the inner surface of the first frame 201 and the inner surface of the second frame 202 is L2, where the ratio of L1 to L2 satisfies that L1/L2 is greater than or equal to 50%. In other words, only one unit cell 100 is disposed between the first frame 201 and the second frame 202 along the first direction A1, and by thus disposing the relationship of the distances between the unit cell 100 and the two frames in the first direction A1, the purpose of functioning as a cross member or a side member by the unit cell 100 can be achieved. In the exemplary embodiment provided in the present disclosure, only one single battery 100 is disposed between the first frame 201 and the second frame 202 along the first direction A1, so that the single battery 100 may be used as a cross beam or a longitudinal beam for reinforcing the structural strength of the accommodating device 200, and in other possible embodiments, such a size ratio is satisfied, and in the first direction, two or more single batteries may be further disposed, which may also have an effect of at least fully utilizing the space of the accommodating device.

In some embodiments, the ratio of L1 to L2 may satisfy 80% L1/L2 97% so that the first end and the second end of the cell 100 are as close to the first frame 201 and the second frame 202 as possible, and even abut against the first frame 201 and the second frame 202, so as to facilitate the dispersion and transmission of force by the structure of the cell 100 itself, and ensure that the cell 100 may be used as a cross beam or a longitudinal beam for reinforcing the structural strength of the accommodating device 200, and ensure that the accommodating device 200 has sufficient strength to resist deformation caused by external force.

As shown in fig. 3, in some embodiments, the plurality of unit cells 100 may have a plurality of arrangements in the receiving device 200, and in one embodiment provided by the present disclosure, the plurality of unit cells 100 are arranged along a second direction A2 different from the first direction A1. The plurality of unit cells 100 may be spaced apart from each other in the second direction A2 or closely spaced apart from each other as shown in the present embodiment in the second direction A2 perpendicular to the first direction A1 to fully utilize the space.

In one embodiment provided in the present disclosure, the first direction A1 may be perpendicular to the second direction A2, where the first direction A1 is a length direction of each unit cell 100, and the second direction A2 is a length direction of the first frame 201 and the second frame 202, that is, a thickness direction of each unit cell 100. That is, the first and

second frames

201 and 202 are perpendicular to the unit cells 100, and both ends of each unit cell 100 in the length direction are supported on the first and

second frames

201 and 202. In this way, when the first frame 201 and/or the second frame 202 receive the external force impact, the plurality of unit cells 100 can conduct and disperse the force, thereby better playing a role of reinforcing structure and improving the capability of the accommodating device 200 to resist the deformation of the external force. In this embodiment, as shown in the drawing, the first frame 201 and the second frame 202 are in a straight line structure, and the second direction A2 is a straight line direction, and in some possible embodiments, the first frame and the second frame may be in a curved line structure, where the first direction may be a circumferential direction, and the corresponding second direction is a radial direction.

In some embodiments, as shown in fig. 23, the power battery pack is arranged with a plurality of layers of the plurality of unit batteries 100 along the third direction A3. In other words, the plurality of unit cells 100 are arranged in a plurality of layers stacked in the third direction A3, the plurality of unit cells 100 in each layer being located between the first frame 201 and the second frame 202, and the number of layers of the unit cells 100 may be set according to the size of the receiving device 200. In this way, a plurality of unit batteries 100 can be arranged as much as possible in the limited space of the receiving device 200, thereby further improving the volume utilization rate of the receiving device 200 and improving the capacity, voltage and cruising ability of the power battery pack. In one exemplary embodiment, the first direction A1 and the second direction A2 may be perpendicular to each other, and the third direction A3 may be perpendicular to the first direction A1 and the second direction A2. More specifically, the first direction A1 and the second direction A2 are front-rear, left-right directions in the horizontal direction, and the third direction A3 is a vertical direction. Alternatively, the unit cells 100 in the respective layers may or may not be connected to each other, which is not a limitation of the present disclosure.

In the above embodiment, the unit cells stacked along the third direction may be unit cells with two ends mated with the first frame and the second frame, or may be unit cells directly placed on top of the next layer of unit cells without being mated with, supported by or connected to the first frame and the second frame.

In one embodiment, as shown in fig. 2 to 4, the first electrode 101 of the unit cell 100 is led out from the unit cell 100 toward the first end of the first frame 201, and the second electrode 102 of the unit cell 100 is led out from the unit cell 100 toward the second end of the second frame 202. In other words, the longitudinal direction of the unit cell 100 may be the current direction inside the unit cell 100, that is, the current direction inside the unit cell 100 is the first direction A1. In this way, since the current direction is the same as the length direction of the unit cell 100, the effective heat dissipation area of the unit cell 100 is larger and the heat dissipation efficiency is better. Here, the first electrode 101 may be a positive electrode of the unit cell 100, and the second electrode 102 may be a negative electrode of the unit cell 100; alternatively, the first electrode 101 is a negative electrode of the unit cell 100, and the second electrode 102 is a positive electrode of the unit cell 100.

In one embodiment of the disclosure, as shown in fig. 2, the unit cells 100 are square cells having a cuboid structure, and have a length, a thickness, and a height between the length and the thickness, each unit cell 100 is placed on the side, the length direction of each unit cell 100 is a first direction A1, the thickness direction is a second direction A2, and the height direction is a third direction A3, and two adjacent unit cells 100 are arranged in a large-surface-to-large-area manner. In other words, the rectangular parallelepiped has a length L in the longitudinal direction, a thickness D in the thickness direction perpendicular to the longitudinal direction, and a height H in the height direction, which is between the length L and the thickness D. Specifically, the unit cell 100 has a large face, a narrow face, and an end face, the long side of the large face having the length L described above, and the short side having the height H described above; the long side of the narrow surface has the length L, and the short side has the thickness D; the long side of the end face has the height H and the short side has the thickness D. The unit battery 100 is placed sideways, that is, two end faces of the unit battery 100 face the first frame 201 and the second frame respectively, and large faces of two adjacent unit batteries 100 are opposite, so that the unit battery 100 has the function of replacing a cross beam, and has better effect and higher strength. In other embodiments, the battery cell 100 may also be a cylindrical battery,

In the prior art, how to design the shape and size of the single battery 100 so that the single battery can have proper battery capacity and good heat dissipation effect has been one of the problems to be solved in the battery technology field.

In one embodiment provided by the present disclosure, the ratio of the length L and the thickness D of the unit cell 100 satisfies 50.ltoreq.L/D.ltoreq.70. At this ratio, the unit cell 100 having a long length and a thin thickness can be obtained, and thus, it can be ensured that a proper resistance value, a high heat dissipation area and heat dissipation efficiency can be maintained and adaptability to various vehicle types is good in the case that the length of the unit cell 100 extends in the first direction A1.

In another embodiment provided by the present disclosure, the ratio of the surface area S to the volume V of the unit cell 100 satisfies 0.15.ltoreq.S/V.ltoreq.0.2. Under this ratio, the single battery 100 with longer length and thinner thickness can be realized, and also can be realized through the adjustment of the size, and the ratio of the surface area S to the volume V of the single battery 100 can be controlled, so that the length of the single battery 100 can be ensured to extend along the first direction A1, and meanwhile, the sufficient heat dissipation area can be provided, so as to ensure the heat dissipation effect of the single battery 100.

In yet another embodiment provided by the present disclosure, the surface area S to energy E) ratio of the unit cell 100 satisfies 250.ltoreq.S/E.ltoreq.400. At this ratio, the unit cell 100 having a long length and a thin thickness can be obtained, and also, the ratio can be made long by the above-mentioned length. The thickness of the single battery is thinner, and the single battery can also be realized by adjusting other sizes. By controlling the ratio of the surface area S of the unit cell 100 to the energy E, it is possible to ensure that the unit cell 100 has a certain energy E and the surface area thereof can meet the heat dissipation requirement thereof.

In some embodiments, in an embodiment provided by the present disclosure, the single battery 100 may be a square battery with a metal casing, that is, the casing of the single battery 100 is made of a metal material, so that the heat conducting performance of the metal is better, and therefore, the heat dissipation efficiency of the single battery 100 can be further improved, and the heat dissipation effect is optimized. In another embodiment provided by the present disclosure, the unit battery 100 may be a soft package battery, where the soft package battery is a polymer shell sleeved on a liquid lithium ion battery, and is structurally packaged by an aluminum plastic film, and when a potential safety hazard occurs, the soft package battery may be blown to rupture, and not explode, so that the safety performance of the unit battery 100 is improved.

Further, in one embodiment provided in the present disclosure, as shown in fig. 3 to 8, the receiving device 200 may further include a third frame 203 and a fourth frame 204 oppositely disposed along a second direction A2 different from the first direction A1, and the plurality of unit cells 100 may be arranged between the third frame 203 and the fourth frame 204 along the second direction A2. Alternatively, in one embodiment, the first direction A1 may be perpendicular to the second direction A2, and the first and

second frames

201 and 202 are perpendicular to and connected with the third and

fourth frames

203 and 204, so that the receiving device 200 is formed in a rectangular or square shape. In other embodiments, the first and

second frames

201 and 202 may be parallel to each other, and the third and

fourth frames

203 and 204 may be disposed at an angle to the first and

second frames

201 and 202, such that the receiving device 200 is formed in a trapezoid, a parallelogram, or the like. The present disclosure is not limited to the specific shape of the housing device 200 constituted by the first frame 201, the second frame 202, the third frame 203, and the fourth frame 204.

It should be noted that, the housing device 200 is substantially the same in shape and structure as the vehicle tray for housing and mounting the unit battery 100, or the cavity 300 integrally formed with the chassis of the electric vehicle, and the structures of the first end plate 207, the second end plate 208, the first side plate 209, the second side plate 210, the first elastic buffer plate 205, the second elastic buffer plate 206, and the like mounted in the vehicle tray are also applicable to the cavity 300, and the dimensional relationship between the vehicle tray and the unit battery 100 is also applicable to the cavity 300 and the unit battery 100.

Accordingly, the present disclosure also provides a battery receiving device that is a cavity 200 formed on a battery car, and the cavity 200 may be the receiving device 200 mentioned above and below.

In some embodiments, as shown in fig. 3, the third frame 203 applies a force towards the fourth frame 204 to the unit cells 100 disposed adjacent to the third frame 203, and the fourth frame 204 applies a force towards the third frame 203 to the unit cells 100 disposed adjacent to the fourth frame 204, so that the plurality of unit cells 100 can be closely arranged between the third frame 203 and the fourth frame 204 along the second direction A2, and the plurality of unit cells 100 can be attached to each other. In addition, the third frame 203 and the fourth frame 204 may limit the plurality of unit cells 100 in the second direction A2, and particularly when the unit cells 100 expand a small amount, may buffer and provide an inward pressure to the unit cells 100, preventing the unit cells 100 from expanding excessively. Particularly, when the unit cell 100 is provided with the explosion-proof valve 103 and the Current Interrupt Device (CID) device, the expansion of the unit cell 100 can be effectively restricted by the third frame 203 and the fourth frame 204, so that when the unit cell 100 fails and expands, the inside thereof can have enough air pressure to burst through the overturning piece in the explosion-proof valve 103 or the Current Interrupt Device (CID) device, thereby shorting the unit cell 100, ensuring the safety of the unit cell 100, and preventing the explosion of the unit cell 100.

Alternatively, as shown in fig. 12 and 13, a first elastic buffer plate 205 may be provided between the third frame 203 and the unit cell 100 adjacent to the third frame 203, and/or a second elastic buffer plate 206 may be provided between the fourth frame 204 and the unit cell 100 adjacent to the fourth frame 204. The first elastic buffer plate 205 may be installed on the third frame 203, the second elastic buffer plate 206 may be installed on the fourth frame 204, and the plurality of unit cells 100 may be closely arranged through the first elastic buffer plate 205 and the second elastic buffer plate 206, so that the number of unit cells 100 arranged between the third frame 203 and the fourth frame 204 may be adjusted by changing the installation distance between the first elastic buffer plate 205 and the second elastic buffer plate 206 and the third frame 203 and the fourth frame 204 without changing the interval between the third frame 203 and the fourth frame 204.

In one embodiment, as shown in fig. 2 and 10, the unit batteries 100 are provided with explosion-proof valves 103 toward the first end of the first frame 201, the first frame 201 is internally provided with an exhaust channel 222, the first frame 201 is provided with air inlets 221 at positions corresponding to the explosion-proof valves 103 of each unit battery 100, the air inlets 221 are communicated with the exhaust channel 222, and the accommodating device 200 is provided with exhaust holes communicated with the exhaust channel 222; and/or the second end of the single battery 100 facing the second frame 202 is provided with an explosion-proof valve 103, the second frame 202 is internally provided with an exhaust channel 222, the position on the second frame 202 corresponding to the explosion-proof valve 103 of each single battery 100 is provided with an air inlet 221, the air inlet 221 is communicated with the exhaust channel 222, and the accommodating device 200 is provided with an exhaust hole communicated with the exhaust channel 222. In other embodiments, as shown in fig. 12 and 14, the air inlet 221 may also be formed on the first end plate 207 and the first frame 201, and/or the second end plate 208 and the second frame 202.

In the prior art, in the use of battery cell, if its inside atmospheric pressure increases to certain degree, then explosion-proof valve opens, and the inside flame of battery cell, smog or gaseous can be discharged through explosion-proof valve, and this flame, smog or gaseous can gather in the inside of power battery package, if can't in time discharge, then can cause secondary injury to the battery cell. However, in the present disclosure, since the first and/or

second frames

201 and 202 are provided with the air inlet 221 corresponding to the explosion-proof valve 103 of the unit cell 100, and the air exhaust passage 222 is provided inside the first and/or

second frames

201 and 202, when the air pressure inside the unit cell 100 increases, the explosion-proof valve 103 is opened, flame, smoke or gas, etc. inside the air exhaust passage 222 is directly introduced into the first and/or

second frames

201 and 202 through the air inlet 221, and is exhausted to the first and/or

second frames

201 and 202 through the air exhaust hole, for example, is exhausted to the atmosphere through the air exhaust hole, such that the flame, smoke or gas is not accumulated inside the receiving device 200, thereby avoiding secondary damage to the unit cell 100 by the flame, smoke or gas.

In addition, in one embodiment provided by the present disclosure, a plurality of unit cells 100 may be directly mounted in the receiving device 200, and first and second ends of the unit cells 100 may be supported on the first and

second frames

201 and 202, respectively. In another embodiment provided in the present disclosure, as shown in fig. 15, a plurality of unit batteries 100 may be assembled into at least one battery module, and then the battery module is mounted in the receiving device 200. Based on the technical conception of the disclosure, the technical effect of the disclosure can be realized through the matching relationship between the external structure of the battery module and the first frame and the second frame.

In one embodiment, a first end plate is disposed between a first end of at least some of the plurality of cells and the first frame; a second end plate is arranged between the second end of at least part of the single batteries and the second frame; the first ends of the at least partial single batteries are supported on the first frame through the first end plate, and the second ends of the at least partial single batteries are supported on the second frame through the second end plate; the first end plate, the second end plate and the at least part of single batteries form a battery module.

At least a part of the plurality of unit cells 100, as shown in fig. 12 and 14, a first end plate 207 is disposed at an end of one unit cell 100 adjacent to the first frame 201 toward the first frame 201; at least a portion of the plurality of unit cells 100, a second end plate 208 is disposed at an end of one unit cell 100 adjacent to the second frame 202 toward the second frame 202; each unit cell 100 is supported on the first frame 201 through the first end plate 207, and each unit cell 100 is supported on the second frame 202 through the second end plate 208; the first end plate 207, the second end plate 208, and at least a portion of the plurality of unit cells 100 constitute a battery module. The first end plate 207 may be one, the second end plate 208 may be one, and the first end plate 207, the second end plate 208, and the plurality of unit cells 100 constitute a battery module, which is supported between the first frame 201 and the second frame 202 through the first end plate 207 and the second end plate 208. The first end plate 207 may be plural, the second end plate 208 may be plural, the plurality of first end plates 207, the second end plate 208, and the unit cells 100 constitute a plurality of battery modules, each battery module is supported between the first frame 201 and the second frame 202 through the corresponding first end plate 207 and second end plate 208, each battery module extends between the first frame 201 and the second frame 202, and the plurality of battery modules are arranged along the length direction of the first frame 201 and the second frame 202. In the present disclosure, the number of the first and

second end plates

207 and 208, that is, the number of the battery modules is not limited.

In some embodiments, a module bottom plate 211 is disposed below at least a portion of the unit cells 100, the module bottom plate 211 is connected to the first end plate 207, and the module bottom plate 211 is connected to the second end plate 208; the module bottom plate 211, the first end plate 207, the second end plate 208 and the at least part of the unit cells 100 form the battery module. In other words, a module base plate 211 is disposed under at least a portion of the plurality of unit cells 100, the module base plate 211 is connected to the first end plate 207, and the module base plate 211 is connected to the second end plate 208; the module bottom plate 211, the first end plate 207, the second end plate 208, and at least a portion of the plurality of unit cells 100 constitute a battery module. In other words, the module bottom plate 211 may be one, the first end plate 207 and the second end plate 208 are connected to the module bottom plate 211, the first end plate 207, the second end plate 208, and the module bottom plate 211 form an accommodating space for accommodating the plurality of unit batteries 100, and when the module bottom plate 211 is installed, the first end plate 207 and the second end plate 208 are supported on the first frame 201 and the second frame 202 after the plurality of unit batteries 100 are disposed in the accommodating space. The module base plate 211 may also be plural so as to constitute a plurality of battery modules with the plurality of first and

second end plates

207 and 208, the plurality of battery modules being mounted in the receiving device 200.

In some embodiments, a module top plate 212 is disposed above at least a portion of the unit cells 100, the module top plate 212 is connected to the first end plate 207, and the module top plate 212 is connected to the second end plate 208; the module top plate 212, the module bottom plate 211, the first end plate 207, the second end plate 208 and the at least part of the unit cells 100 form the battery module. In other words, a module top plate 212 is disposed above at least a portion of the plurality of unit cells 100, the module top plate 212 is connected to the first end plate 207, and the module top plate 212 is connected to the second end plate 208; the module top plate 212, the module bottom plate 211, the first end plate 207, the second end plate 208, and at least a portion of the plurality of unit cells 100 constitute a battery module. In other words, the module top plate 212 is located at the top of the first end plate 207 and the second end plate 208, the module bottom plate 211 is located at the bottom of the first end plate 207 and the second end plate 208, and the unit cells 100 are located between the module top plate 212 and the module bottom plate 211, so that the module top plate 212 and the module bottom plate 211 can prevent the unit cells 100 from moving up and down, and the stability of the unit cells 100 is increased.

In some embodiments, the accommodating device 200 is relatively provided with a third frame 203 and a fourth frame 204 along a second direction A2 different from the first direction A1, a first side plate 209 is disposed on a side, facing the third frame 203, of the unit cells 100 adjacent to the third frame 203, a second side plate 210 is disposed on a side, facing the fourth frame 204, of the unit cells 100 adjacent to the fourth frame 204, and the first end plate 207, the second end plate 208, the first side plate 209, the second side plate 210, the module top plate 212, the module bottom plate 211, and at least a portion of the plurality of unit cells 100 form a battery module. The battery module may be one or more, the first end plate 207, the second end plate 208, the first side plate 209, and the second side plate 210 may be disposed around the module top plate 212 and the module bottom plate 211, the first end plate 207 is fixed on the first side frame 201, the second end plate 208 is fixed on the second side frame 202, the first side plate 209 is fixed on the third side frame 203, the second side plate 210 is fixed on the fourth side frame 204, and the first end plate 207, the second end plate 208, the first side plate 209, the second side plate 210, the module top plate 212, and the module bottom plate 211 together define a closed accommodating space for accommodating the plurality of battery cells 100, so that, when the battery cells 100 fail, the first end plate 207, the second end plate 208, the first side plate 209, the second side plate 210, the module top plate 212, and the module bottom plate 211 may control the failure of the battery cells 100 within a certain range, thereby preventing the battery cells 100 from exploding and affecting surrounding components. Alternatively, the first side plate 209 may be the above-mentioned first elastic buffer plate 205, and the second side plate 210 may be the above-mentioned second elastic buffer plate 206, so that the first side plate 209 and the second side plate 210 have a function of limiting expansion deformation of the plurality of unit cells 100, thereby ensuring activation of the explosion-proof valve 103 and/or the Current Interrupt Device (CID).

In another embodiment, a module bottom plate 211 is disposed below at least some of the plurality of unit cells 100, and the at least some unit cells 100 are supported on the first frame 201 and the second frame 202 by the module bottom plate 211; the module bottom plate 211 and the at least part of the unit batteries 100 form a battery module. In other words, a module bottom plate 211 is disposed under at least a portion of the plurality of unit cells 100, and each unit cell 100 is supported on the first and

second frames

201 and 202 by the module bottom plate 211; in this embodiment, the plurality of unit batteries 100 are supported on the first frame 201 and the second frame 202 through the module bottom plate 211, so that the structure of the battery module is simplified, and the light weight of the power battery pack is facilitated.

In one embodiment, at least two battery modules are arranged along a second direction A2 different from the first direction A1, and a plurality of battery modules are arranged along the second direction A2. In other embodiments, the battery module may be one.

The first and

second end plates

207 and 208, or the module bottom plate 211 may be supported on the first and second side frames 201 and 202 by various embodiments, for example, detachably fastened to the first and second side frames 201 and 202 by fasteners; or is fixed with the first frame 201 and the second frame 202 by welding; or is connected with the first frame 201 and the second frame 202 in a dispensing mode; or is directly prevented from being supported by the first and

second frames

201 and 202 on the first and

second frames

201 and 202.

In some embodiments, as shown in fig. 23, the power battery pack is provided with a plurality of layers of the battery modules along the third direction A3. For the embodiment in which the unit cells 100 are disposed in the receiving device 200 through the battery modules, the battery modules may be multi-layered in the third direction A3, with at least one battery module in each layer. In this way, the volume utilization rate of the accommodating device 200 can be further improved, and the cruising ability of the power battery pack can be further improved.

In the above embodiment, the battery modules stacked in the third direction may be battery modules with both ends mated with the first frame and the second frame, or may be battery modules directly placed on top of the next layer of battery modules without being mated with, supported by or connected to the first frame and the second frame.

In some embodiments, as shown in fig. 9 and 10, a heat insulation layer 217 may be disposed between the module bottom plate 211 and the unit battery 100 to isolate the unit battery 100 from external heat transfer, so as to realize the heat insulation function of the unit battery 100 and avoid thermal interference between the external environment outside the accommodating device 200 and the unit battery 100 in the accommodating device 200. Alternatively, the insulating layer 217 may be made of a material having a heat insulating and preserving function, for example, made of heat preserving cotton.

For the embodiment of the battery module including the module top plate 212, as shown in fig. 11, a heat conducting plate 218 may be disposed between the module top plate 212 and the unit battery 100, so as to facilitate heat dissipation of the unit battery 100 and ensure that the temperature difference between the plurality of unit batteries 100 is not excessive. The heat conductive plate 218 may be made of a material having good heat conductivity, for example, the heat conductive plate 218 may be made of copper or aluminum having high heat conductivity.

In one embodiment, the module top plate 212 is a liquid cooling plate 219 having a cooling structure provided therein, and a coolant is provided inside the liquid cooling plate 219, so that the cooling of the unit battery 100 is achieved by the coolant, and the unit battery 100 can be at an appropriate operating temperature. Since the liquid cooling plate 219 and the unit cells 100 are provided with the heat conduction plate 218, when the unit cells 100 are cooled by the coolant, the temperature difference at each position of the liquid cooling plate 219 can be equalized by the heat conduction plate 218, thereby controlling the temperature difference between the plurality of unit cells 100 within 1 ℃.

In order to improve the cooling effect of the liquid cooling plate 219, as shown in fig. 17 to 19, a gas-liquid separator 223 may be disposed upstream of the liquid cooling plate 219, and since the cooling liquid in the liquid cooling plate 219 may come from other thermal management circuits of the vehicle, the cooling liquid may be a mixed cooling liquid of gas and liquid, so that after the gas-liquid separation of the mixed cooling liquid by the gas-liquid separator 223, the cooling liquid of pure liquid phase may be ensured to enter the liquid cooling plate 219 to cool the unit battery 100, thereby ensuring the cooling effect.

The cold liquid plate may have any suitable structure. In one embodiment, as shown in fig. 17, the liquid cooling plate 219 may have a plurality of cooling liquid pipes 224 therein, each cooling liquid pipe 224 is formed in a U-shaped structure to have a cooling liquid inlet 225 and a cooling liquid outlet 226 on the same side, the cooling liquid inlets 225 and the cooling liquid outlets 226 of the plurality of cooling liquid pipes 224 are sequentially spaced apart along the arrangement direction of the plurality of cooling liquid pipes 224, the power battery pack further includes a liquid inlet manifold 227 and a liquid outlet manifold 228, each cooling liquid inlet 225 communicates with the liquid inlet manifold 227, and each cooling liquid outlet 226 communicates with the liquid outlet manifold 228.

In another embodiment, as shown in fig. 18 and 19, a plurality of cooling liquid pipelines 224 are provided in the liquid cooling plate 219, the plurality of cooling liquid pipelines 224 are straight pipelines and are arranged at intervals in parallel, two ends of each cooling liquid pipeline 224 are respectively provided with a cooling liquid inlet 225 and a cooling liquid outlet 226 which are oppositely arranged, the cooling liquid inlets 225 and the cooling liquid outlets 226 of the plurality of cooling liquid pipelines 224 are sequentially arranged at intervals along the arrangement direction of the plurality of cooling liquid pipelines 224, the power battery pack further comprises a liquid inlet main 227 and a liquid outlet main 228, each cooling liquid inlet 225 is communicated with the liquid inlet main 227, and each cooling liquid outlet 226 is communicated with the liquid outlet main 228. As shown in fig. 18 and 19, a cooling liquid main inlet 229 is provided on the liquid inlet main pipe 227, a cooling liquid main outlet 230 is provided on the liquid outlet main pipe 228, and the cooling liquid main inlet 229 and the cooling liquid main outlet 230 are located on the same side or opposite sides of the water cooling plate.

In another embodiment provided by the present disclosure, the module top plate 212 is a direct cooling plate 220 with a cooling structure inside, the direct cooling plate 220 is internally provided with a coolant, the coolant can be the coolant after heat dissipation and cooling by a vehicle air conditioning system, and the low-temperature coolant can effectively absorb the heat of the single battery 100, so that the temperature of the single battery 100 is always kept at a proper temperature value. Wherein the piping in the direct cooling plate 220 and the liquid cooling plate 219 may be the same or different.

In addition, in order to allow the first and

second frames

201 and 202 to provide the supporting force to the unit cells 100, in one embodiment provided by the present disclosure, as shown in fig. 5 and 6, the first frame 201 is provided with a first supporting step 213, and the second frame 202 is provided with a second supporting step 214; the first end of each unit cell 100 is supported on the first support step 213, and the second end of each unit cell 100 is supported on the second support step 214. Alternatively, the first support step 213 may protrude inward from the bottom of the first bezel 201, and the second support step 214 may protrude inward from the bottom of the second bezel 202. Compared with the prior art in which the battery cell 100 is supported by the bottom plate in the receiving device 200, in the present disclosure, the structure of the receiving device 200 provided by the present disclosure can be simplified and the weight of the receiving device 200 can be reduced by supporting the battery cell 100 through the first and second support steps 213 and 214 provided on the first and

second frames

201 and 202. Alternatively, insulating plates may be provided on the first and second support steps 213 and 214, with the insulating plates being located between the unit cells 100 and the first and second support steps 213 and 214.

In some embodiments, the first frame 201 is further provided with a first fixing portion 215, the second frame 202 is further provided with a second fixing portion 216, and the first end of each unit cell 100 is fixed to the first fixing portion 215, and the second end of each unit cell 100 is fixed to the second fixing portion 216. Alternatively, the first fixing portion 215 may be a third supporting step provided on the first frame 201, the third supporting step being located above the first supporting step 213, and the second fixing portion 216 may be a fourth supporting step provided on the second frame 202, the fourth supporting step being located above the second supporting step 214. The first and second ends of the battery may be fixed with the first and second fixing

parts

215 and 216 by fasteners; or welded to the first and second fixing

portions

215 and 216.

For an embodiment in which the plurality of unit cells 100 are provided with the first end plate 207 adjacent to one end of the first frame 201 and the second end plate 208 adjacent to one end of the second frame 202, the bottom of the first end plate 207 may be supported on the first supporting step 213, and the top or side wall of the first end plate 207 may be fixed on the first fixing part 215; the bottom of the second end plate 208 may be supported on the second support step 214, and the top or side wall of the second end plate 208 may be fixed on the second fixing portion 216.

Further, when the power battery pack provided by the present disclosure is disposed on an electric vehicle, in one embodiment provided by the present disclosure, the above-mentioned first direction A1 may be a width direction of a vehicle body, i.e., a left-right direction of the vehicle, and the second direction A2 may be a body length direction of the vehicle, i.e., a front-rear direction of the vehicle, such that the unit battery 100 functions as a lateral stiffener in the accommodation device 200 due to the unit battery 100 extending in the first direction A1. In another embodiment provided by the present disclosure, the above-mentioned first direction A1 may be a body length direction of the vehicle, i.e., a front-rear direction of the vehicle, and the second direction A2 may be a width direction of the vehicle, i.e., a left-right direction of the vehicle, such that the unit battery 100 functions as a longitudinal stiffener in the receiving device 200 as the unit battery 100 extends in the first direction A1.

According to another aspect of the present disclosure, there is provided an energy storage device comprising the power cell pack described above. The energy storage device not only can be used for a passenger car, but also can be used for devices such as commercial vehicles, special vehicles, ships, standby power supplies (dps, ups), electric bicycles, electric motorcycles, electric scooters and the like which need to use the single battery 100 to provide electric energy for the devices.

According to still another aspect of the present disclosure, there is provided an electric vehicle having at least one of the above-mentioned receiving devices 200 formed thereon, the receiving device 200 being the above-mentioned cavity 300 integrally formed on the electric vehicle.

According to still another aspect of the present disclosure, there is provided an electric vehicle including the above-described power battery pack, in which the receiving device 200 is a separately produced tray for a vehicle for receiving and mounting the unit batteries 100.

Here, the electric vehicle may include a commercial vehicle, a special vehicle, an electric bicycle, an electric motorcycle, an electric scooter, etc. which needs to be supplied with electric energy using a power battery pack to drive the electric vehicle to travel.

In some embodiments, the power battery pack is disposed at the bottom of the electric vehicle, and the accommodating device 200 is fixedly connected with the chassis of the electric vehicle. Because the installation space of the chassis of the electric vehicle is larger, the power battery pack is arranged at the chassis of the electric vehicle, so that the number of the single batteries 100 can be increased as much as possible, and the cruising ability of the electric vehicle is improved.

In some embodiments, the electric vehicle includes a power battery pack disposed at the bottom of the electric vehicle, the accommodating device 200 is fixedly connected with the chassis of the electric vehicle, the first direction A1 is a vehicle body width direction of the electric vehicle, that is, a left-right direction of the electric vehicle, and the second direction A2 is a vehicle body length direction of the electric vehicle, that is, a front-rear direction of the electric vehicle. In other embodiments, the electric vehicle may include a plurality of power battery packs disposed at the bottom of the electric vehicle, and the plurality of power battery packs may have the same shape and size or may be different from each other, and specifically, each power battery pack may be adjusted according to the shape and size of the chassis of the electric vehicle, and the plurality of power battery packs are arranged along the length direction of the vehicle body, that is, in the front-rear direction.

In some examples, in one embodiment provided by the present disclosure, the ratio of the width L3 of the accommodating device 200 in the first direction A1 to the vehicle body width W satisfies: in this embodiment, it is possible to realize that only one accommodating device 200 is provided in the width direction of the vehicle body, and when the accommodating devices 200 are plural, the plural accommodating devices 200 are arranged in the length direction of the vehicle body. Typically, for most vehicles, the body width is 500mm-2000mm, e.g., 500mm, 1600mm, 1800mm, 2000mm, the body length is 500mm-5000mm, and for passenger vehicles, the body width is typically 500mm-1800mm, the body length is 500mm-4000mm.

In some embodiments, the ratio of the length L4 of the battery cell 100 in the first direction A1 to the vehicle body width W satisfies: L4/W is more than or equal to 40% and less than or equal to 70%. In consideration of the thicknesses of the first frame 201 and the second frame 202 of the accommodation device 200, when the ratio of the length L4 of the unit battery 100 in the first direction A1 to the vehicle body width W satisfies: when 40% or less and 70% or less of L4/W or less, in the present embodiment, only one single battery 100 may be provided in the width direction of the vehicle body. In other possible embodiments, when such a size requirement is satisfied, a plurality of battery modules or a plurality of battery cells may be provided in the longitudinal direction. As one embodiment, the length L4 of the unit battery 100 in the first direction A1 is 500mm to 1000mm.

It should be noted that, in some embodiments of the present invention, although a scheme is disclosed in which two ends of a single battery are respectively supported by the first frame and the second frame in a matching manner, in an actual production process, it is possible that a single battery with a length dimension matching with a width of a vehicle body cannot be manufactured; that is, the cells cannot be processed to the desired length for some reason. Because the electric vehicle has a requirement on the voltage platform of the single battery, the volume of the single battery is certain when the electric vehicle reaches a certain voltage platform under a fixed material system; this allows the thickness or width of the unit cell to be reduced if the length of the unit cell is increased. On the other hand, to ensure the surface area of the whole battery to improve the heat dissipation function, the length of the single battery cannot be increased by reducing the width (height) of the single battery; meanwhile, on the vehicle body, the utilization of the height space is limited, and in order to reduce the influence to the greatest extent, the width (height) of the single battery is not regulated. Therefore, only the length of the single battery in the first direction and the thickness of the single battery in the second direction can be changed to change the surface area of the whole single battery; therefore, if the length is to be increased, a large probability is considered from the viewpoint of reducing the thickness. In practice, the thickness of the single battery has a minimum limit value because the battery core and the related materials are required to be added inside; this makes it impossible to infinitely increase the length of the unit cell because the length of the unit cell is affected by the limit value of the thickness, and the length changing ability in the first direction is also limited.

Thus, in some embodiments, the above-described problem may be solved by providing two single cells in the first direction. For example, in the scheme that one single battery is originally arranged along the first direction, the length of the single battery along the first direction is 1000mm, and then after the scheme is used, two single batteries are arranged along the first direction, and the length of each single battery is approximately 450 mm. Less than half of 1000mm because of the intermediate need to add mounting locations.

In some embodiments, the battery pack includes a receiving device 200 and a plurality of unit batteries 100 disposed in the receiving device 200, the receiving device 200 includes a first frame 201 and a second frame 202 disposed opposite to each other along a first direction A1, the plurality of unit batteries 100 are disposed between the first frame 201 and the second frame 202, and two unit batteries 100 are disposed between the first frame 201 and the second frame 202 along the first direction A1.

In the present disclosure, along the first direction, only two single batteries 100 are disposed between the first frame 201 and the second frame 202, and the single batteries 100 may function as a cross beam and/or a longitudinal beam, thereby reducing the use of the cross beam and/or the longitudinal beam in the accommodating device 200, and even the use of the cross beam and/or the longitudinal beam in the accommodating device 200 may not be used, thereby reducing the space occupied by the cross beam and/or the longitudinal beam in the accommodating device 200, improving the space utilization of the accommodating device 200, and enabling more single batteries 100 to be disposed in the accommodating device 200 as much as possible, so as to improve the capacity, the voltage and the cruising ability of the whole power battery pack. For example, in an electric vehicle, the design can improve the space utilization rate from about 40% to more than 60% or even higher, such as 80%.

Optionally, the accommodating device 200 is a vehicle tray.

Alternatively, the accommodating device 200 is formed on an electric vehicle.

Optionally, the accommodating device 200 is a cavity 300 recessed downward.

Optionally, the cavity 300 includes a first side wall 301 and a second side wall 302 opposite to each other, the first frame 201 is an extension of the first side wall 301 and the first side wall 301 of the cavity 300, and the second frame 202 is an extension of the second side wall 302 and the second side wall 302 of the cavity 300.

Optionally, the extension of the first sidewall 301 and the extension of the second sidewall 302 form a bottom 305 of the cavity 300.

Optionally, the unit battery 100 is perpendicular to the first frame 201 and the second frame 202, and a length of the unit battery 100 along the first direction A1 is a distance between a first end and a second end of the unit battery.

Alternatively, a plurality of the unit cells 100 are arranged in a second direction A2 different from the first direction A1.

Alternatively, the power battery pack is provided with a plurality of layers of the plurality of unit batteries 100 along the third direction A3, and the plurality of unit batteries 100 in each layer are located between the first frame 201 and the second frame 202.

Alternatively, each of the unit cells 100 is disposed with the first direction A1 as a longitudinal direction.

Alternatively, the accommodating device 200 includes a third frame 203 and a fourth frame 204 disposed opposite to each other along a second direction A2 different from the first direction A1, and the plurality of unit cells 100 are arranged between the third frame 203 and the fourth frame 204 along the second direction A2.

Alternatively, the third frame 203 applies a force toward the fourth frame 204 to the unit cells 100 disposed adjacent to the third frame 203, and the fourth frame 204 applies a force toward the third frame 203 to the unit cells 100 disposed adjacent to the fourth frame 204.

Optionally, a first elastic buffer plate 205 is disposed between the third frame 203 and the unit cell 100 adjacent to the third frame 203, and/or a second elastic buffer plate 206 is disposed between the fourth frame 204 and the unit cell 100 adjacent to the fourth frame 204.

Optionally, a first side plate 209 is disposed on a side of the unit cell 100 adjacent to the third frame 203 facing the third frame 203, and a second side plate 210 is disposed on a side of the unit cell 100 adjacent to the fourth frame 204 facing the fourth frame 204.

Optionally, a first end plate 207 is disposed between the first ends of at least some of the plurality of unit cells 100 and the first frame 201; a second end plate 208 is disposed between the second end of at least some of the unit cells 100 and the second frame 202, and the first end plate 207, the second end plate 208, the first side plate 209, the second side plate 210 and the at least some unit cells 100 form a battery module.

Optionally, a module top plate 212 is disposed above at least some of the unit cells 100, the module top plate 212 is connected to the first end plate 207, and the module top plate 212 is connected to the second end plate 208; the module top plate 212, the first end plate 207, the second end plate 208 and the at least part of the unit cells 100 form the battery module.

Optionally, a module bottom plate 211 is disposed above and below at least some of the unit cells 100, the module bottom plate 211 is connected to the first end plate 207, and the module bottom plate 211 is connected to the second end plate 208; the module bottom plate 211, the first end plate 207, the second end plate 208 and the at least part of the unit cells 100 form the battery module.

Optionally, a module top plate 212 is disposed above at least some of the plurality of unit cells 100, and a module bottom plate 211 is disposed below at least some of the unit cells; the first end plate 207, the second end plate 208, the first side plate 209, the second side plate 210, the module top plate 212, the module bottom plate 211, and the at least part of the unit cells 100 constitute the battery module.

Optionally, the battery modules are at least two along a second direction A2 different from the first direction A1.

Optionally, the power battery pack is provided with a plurality of layers of the battery modules along the third direction A3.

Optionally, a thermal insulation layer 217 is disposed between the module base 211 and the unit battery 100.

Optionally, a heat conducting plate 218 is disposed between the module top plate 212 and the unit battery 100.

Optionally, the module top plate 212 is a liquid cooling plate 219 or a direct cooling plate 220 with a cooling structure disposed therein.

Alternatively, the length of the unit cell 100 along the first direction A1 is 500mm to 1000mm.

Optionally, the unit cells 100 are square cells with a cuboid structure, and have a length L, a thickness D, and a height H between the length L and the thickness D, where each unit cell 100 stands on its side, the length direction of each unit cell 100 is the first direction A1, the thickness direction is the second direction A2, the height direction is the third direction A3, and two adjacent unit cells 100 are arranged in a large-surface-to-large manner.

Alternatively, the unit battery 100 is a metal casing prismatic battery.

Alternatively, the first electrode 101 of the unit cell 100 is led out from the unit cell 100 toward the first end of the first frame 201, and the second electrode 102 of the unit cell 100 is led out from the unit cell 100 toward the second end of the second frame 202.

Optionally, the length of the single battery 100 is L, and the thickness of the single battery 100 is D, where the ratio of L to D satisfies 50+.l/d+.70.

Optionally, the surface area of the single battery 100 is S, and the volume of the single battery 100 is V, where the ratio of S to V satisfies 0.15.ltoreq.s/v.ltoreq.0.2.

Optionally, the surface area of the single battery 100 is S, and the energy of the single battery 100 is E, where the ratio of S and E satisfies 250+.s/e+.400.

Optionally, the first direction A1 is a vehicle body width direction, and the second direction A2 is a vehicle body length direction; alternatively, the first direction A1 is a longitudinal direction of the vehicle body.

According to another aspect of the present disclosure, there is provided an electric vehicle including the power battery pack described above.

Optionally, the power battery pack is disposed at the bottom of the electric vehicle, and the accommodating device 200 is fixedly connected with the chassis of the electric vehicle.

Optionally, the electric vehicle includes a power battery pack disposed at the bottom of the electric vehicle, the accommodating device 200 is fixedly connected with the chassis of the electric vehicle, the first direction A1 is a vehicle body width direction of the electric vehicle, and the second direction A2 is a vehicle body length direction of the electric vehicle.

Alternatively, the width of the accommodating device 200 in the first direction A1 is L3, and the width of the vehicle body is W, where the ratio of L3 to W satisfies: L3/W is more than or equal to 50% and less than or equal to 80%.

Optionally, the length of the unit battery 100 in the first direction A1 is L4, and the width of the vehicle body is W, where the ratio of L4 to W satisfies: L4/W is more than or equal to 40% and less than or equal to 70%.

According to yet another aspect of the present disclosure, there is provided an energy storage device including the power cell pack described above.

According to one aspect of the disclosure, a power battery pack includes a housing device 200 and a plurality of unit batteries 100 disposed in the housing device 200, the housing device 200 includes a first frame 201 and a second frame 202 disposed opposite to each other along a first direction A1, the plurality of unit batteries 100 are disposed between the first frame 201 and the second frame 202, a length of the unit batteries 100 along the first direction A1 is L1, and a distance between an inner surface of the first frame 201 and an inner surface of the second frame 202 along the first direction A1 is L2, wherein L1/L2 is satisfied by not less than 50%.

Optionally, a first end of each of the unit cells 100 is supported on the first frame 201, and a second end of each of the unit cells 100 is supported on the second frame 202.

Optionally, 80% or more and 97% or less of L1/L2 or less are satisfied.

Optionally, the accommodating device 200 is a vehicle tray.

Alternatively, the accommodating device 200 is formed on an electric vehicle.

Optionally, the accommodating device 200 is a cavity 300 recessed downward.

Optionally, the extension of the first sidewall and the extension of the first sidewall 302 form a bottom 305 of the cavity 300.

Optionally, the first end of each unit cell 100 is fixed to the first frame 201, and the second end is fixed to the second frame 202.

Optionally, a first end plate 207 is disposed between the first ends of at least some of the plurality of unit cells 100 and the first frame 201; a second end plate 208 is disposed between the second end of at least some of the plurality of unit cells 100 and the second frame 202; a first end of the at least part of the single battery 100 is supported on the first frame 201 through the first end plate 207, and a second end of the at least part of the single battery 100 is supported on the second frame 202 through the second end plate 208; the first end plate 207, the second end plate 208, and the at least part of the unit cells 100 constitute a battery module.

Optionally, a module bottom plate 211 is disposed below at least some of the unit cells 100 in the plurality of unit cells 100, and the at least some unit cells 100 are supported on the first frame 201 and the second frame 202 by the module bottom plate 211; the module bottom plate 211 and the at least part of the unit batteries 100 form a battery module.

Optionally, a module bottom plate 211 is disposed below the at least part of the unit cells, the module bottom plate 211 is connected to the first end plate 207, and the module bottom plate 211 is connected to the second end plate 208; the module bottom plate 211, the first end plate 207, the second end plate 208 and the at least part of the unit cells 100 form the battery module.

Optionally, a module top plate 212 is disposed above at least a portion of the unit cells 100, the module top plate 212 is connected to the first end plate 207, and the module top plate 212 is connected to the second end plate 208; the module top plate 212, the module bottom plate 211, the first end plate 207, the second end plate 208 and the at least part of the unit cells 100 form the battery module.

Optionally, the accommodating device 200 is provided with a third frame 203 and a fourth frame 204 opposite to each other along a second direction A2 different from the first direction A1, a first side plate 209 is provided on a side of the unit cell 100 adjacent to the third frame 203 facing the third frame 203, a second side plate 210 is provided on a side of the unit cell 100 adjacent to the fourth frame 204 facing the fourth frame 204, and the first end plate 207, the second end plate 208, the first side plate 209, the second side plate 210, the module top plate 212, the module bottom plate 211 and the at least part of the unit cells 100 form the battery module.

Optionally, the first frame 201 is provided with a first supporting step 213, and the second frame 202 is provided with a second supporting step 214; the first end of each of the unit cells 100 is supported at the first support step 213, and the second end of each of the unit cells 100 is supported at the second support step 214.

Optionally, the first frame 201 is provided with a first fixing portion 215, and the second frame 202 is provided with a second fixing portion 216; the first end of each unit cell 100 is fixed to the first fixing part 215, and the second end of each unit cell 100 is fixed to the second fixing part 216.

Optionally, a first end plate 207 is disposed between the first ends of the plurality of unit cells 100 and the first side frame 201, a second end plate 208 is disposed between the second ends of the plurality of unit cells 100 and the second side frame, a module bottom plate 211 is disposed below the plurality of unit cells 100, a module top plate 212 is disposed above the plurality of unit cells 100, a third side frame 203 and a fourth side frame 204 are disposed opposite to each other along a second direction A2 different from the first direction A1 of the accommodating device 200, a first side plate 209 is disposed between the unit cells 100 adjacent to the third side frame 203 and the third side frame 203, a second side plate 210 is disposed between the unit cells 100 adjacent to the fourth side frame 204 and the fourth side frame 204, and the first end plate 207, the second end plate 208, the first side plate 209, the second side plate 210, the module top plate 212, the module bottom plate 211 and the plurality of unit cells 100 form a battery module.

Alternatively, the ratio of the length L and the thickness D of the unit cell 100 satisfies 50.ltoreq.L/D.ltoreq.70.

Alternatively, the ratio of the surface area S to the volume V of the unit cell 100 satisfies 0.15.ltoreq.S/V.ltoreq.0.2.

Alternatively, the ratio of the surface area S to the energy E of the unit cell 100 satisfies 250.ltoreq.S/E.ltoreq.400.

Alternatively, the unit battery 100 is a metal casing prismatic battery.

Optionally, the first end of the unit battery 100 facing the first frame 201 is provided with an explosion-proof valve 103, an exhaust channel 222 is provided inside the first frame 201, air inlets 221 are provided on positions on the first frame 201 corresponding to the explosion-proof valves 103 of each unit battery 100, the air inlets 221 are communicated with the exhaust channel 222, and an exhaust hole communicated with the exhaust channel 222 is provided on the accommodating device 200; and/or the second end of the single battery 100 facing the second frame 202 is provided with an explosion-proof valve 103, an exhaust channel 222 is arranged inside the second frame 202, air inlets 221 are arranged at positions on the second frame 202 corresponding to the explosion-proof valves 103 of each single battery 100, the air inlets 221 are communicated with the exhaust channel 222, and the containing device 200 is provided with an exhaust hole communicated with the exhaust channel 222.

Optionally, the first direction A1 is a vehicle body width direction, and the second direction A2 is a vehicle body length direction; alternatively, the first direction A1 is a vehicle body longitudinal direction, and the second direction A2 is a vehicle body width direction.

Alternatively, the ratio of the width L3 of the accommodating device 200 in the first direction A1 to the vehicle body width W satisfies: L3/W is more than or equal to 50% and less than or equal to 80%.

Alternatively, the ratio of the length L4 of the unit battery 100 in the first direction A1 to the vehicle body width W satisfies: L4/W is more than or equal to 40% and less than or equal to 70%.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims

1. A power battery pack comprising a housing means (200) and a plurality of individual cells (100) arranged directly in said housing means (200), said housing means (200) comprising first side frames (201) arranged opposite each other in a first direction (A1)And a second frame (202), wherein the plurality of single batteries (100) are arranged between the first frame (201) and the second frame (202), and along the first direction (A1), two single batteries (100) are arranged between the first frame (201) and the second frame (202), wherein the large surfaces of two adjacent single batteries (100) of the plurality of single batteries (100) are opposite, the single batteries (100) are square batteries with metal shells, the length of the single batteries (100) along the first direction (A1) is 500mm-1000mm, the surface area of the single batteries (100) is S, the energy of the single batteries (100) is E, and the ratio of S to E satisfies 250mm ² ·Wh ^-1 ≤S/E≤400mm ² ·Wh ^-1 。

2. The power cell pack as claimed in claim 1, wherein the receiving means (200) is a vehicle tray.

3. The power battery pack according to claim 1, wherein the housing means (200) is formed on an electric vehicle.

4. A power cell pack as claimed in claim 3, wherein the receiving means (200) is a downwardly concave cavity (300).

5. The power cell pack of claim 4, wherein the cavity (300) includes opposing first and second sidewalls (301, 302), the first rim (201) being the first sidewall (301) and an extension of the first sidewall (301) of the cavity (300), the second rim (202) being the second sidewall (302) and an extension of the second sidewall (302) of the cavity (300).

6. The power cell pack of claim 5, wherein the extension of the first side wall (301) and the extension of the second side wall (302) form a bottom (305) of the cavity (300).

7. The power cell pack according to claim 1, wherein the unit cells (100) are perpendicular to the first and second frames (201, 202), and a length of the unit cells (100) along the first direction (A1) is a distance between the first and second ends of the unit cells.

8. The power battery pack according to claim 1, wherein a plurality of the unit cells (100) are arranged in a second direction (A2) different from the first direction (A1).

9. The power cell pack according to claim 1, wherein the power cell pack is arranged with a plurality of layers of the plurality of unit cells (100) along a third direction (A3), the plurality of unit cells (100) in each layer being located between the first frame (201) and the second frame (202).

10. The power battery pack according to claim 1, wherein each of the unit cells (100) is disposed with the first direction (A1) as a longitudinal direction.

11. The power battery pack according to claim 1, wherein the housing means (200) includes a third frame (203) and a fourth frame (204) disposed opposite to each other in a second direction (A2) different from the first direction (A1), and the plurality of unit cells (100) are arranged between the third frame (203) and the fourth frame (204) in the second direction (A2).

12. The power cell pack according to claim 11, wherein the third frame (203) applies a force toward the fourth frame (204) to a cell (100) disposed adjacent to the third frame (203), and the fourth frame (204) applies a force toward the third frame (203) to the cell (100) disposed adjacent to the fourth frame (204).

13. The power battery pack according to claim 11, wherein a first elastic buffer plate (205) is provided between the third frame (203) and the unit cells (100) adjacent to the third frame (203), and/or a second elastic buffer plate (206) is provided between the fourth frame (204) and the unit cells (100) adjacent to the fourth frame (204).

14. The power battery pack according to claim 11, wherein a first side plate (209) is provided on a side of the unit cells (100) adjacent to the third frame (203) that faces the third frame (203), and a second side plate (210) is provided on a side of the unit cells (100) adjacent to the fourth frame (204) that faces the fourth frame (204).

15. The power cell pack according to claim 14, wherein a first end plate (207) is provided between a first end of at least some of the plurality of cells (100) and the first frame (201); a second end plate (208) is arranged between the second end of at least part of the single batteries (100) and the second frame (202), and the first end plate (207), the second end plate (208), the first side plate (209), the second side plate (210) and the at least part of the single batteries (100) form a battery module.

16. The power cell pack of claim 15, wherein a module top plate (212) is disposed over at least a portion of the plurality of cells (100), the module top plate (212) being connected to the first end plate (207), the module top plate (212) being connected to the second end plate (208); the module top plate (212), the first end plate (207), the second end plate (208) and the at least part of the single batteries (100) form the battery module.

17. The power battery pack according to claim 15, wherein a module bottom plate (211) is disposed above and below at least some of the plurality of unit cells (100), the module bottom plate (211) is connected to the first end plate (207), and the module bottom plate (211) is connected to the second end plate (208); the module base plate (211), the first end plate (207), the second end plate (208) and at least part of the single batteries (100) form the battery module.

18. The power battery pack according to claim 15, wherein a module top plate (212) is disposed above at least some of the plurality of unit cells (100), and a module bottom plate (211) is disposed below at least some of the unit cells; the first end plate (207), the second end plate (208), the first side plate (209), the second side plate (210), the module top plate (212), the module bottom plate (211) and the at least part of single batteries (100) form the battery module.

19. The power battery pack according to any one of claims 15-18, wherein there are at least two battery modules in a second direction (A2) different from the first direction (A1).

20. The power cell pack according to any one of claims 15-18, wherein the power cell pack is arranged with a plurality of layers of the battery modules along a third direction (A3).

21. The power battery pack according to claim 17 or 18, wherein a heat insulating layer (217) is provided between the module bottom plate (211) and the unit battery (100).

22. The power cell pack of claim 16 or 18, wherein a heat conductive plate (218) is provided between the module top plate (212) and the unit cells (100).

23. The power cell pack of claim 16 or 18, wherein the module top plate (212) is a liquid cooling plate (219) or a direct cooling plate (220) with a cooling structure disposed therein.

24. The power battery pack according to claim 1, wherein the unit cells (100) are square cells of a rectangular parallelepiped structure, and have a length (L), a thickness (D), and a height (H) between the length (L) and the thickness (D), each unit cell (100) is placed on its side, the length direction of each unit cell (100) is the first direction (A1), the thickness direction is the second direction (A2), the height direction is the third direction (A3), and adjacent two unit cells (100) are arranged in a large-face-to-large-surface manner.

25. The power battery pack according to claim 1, wherein a first electrode (101) of the unit cell (100) is led out from the unit cell (100) toward a first end of the first frame (201), and a second electrode (102) of the unit cell (100) is led out from the unit cell (100) toward a second end of the second frame (202).

26. The power battery pack according to claim 1, wherein the length of the unit cell (100) is L, and the thickness of the unit cell (100) is D, wherein the ratio of L and D satisfies 50L/D70.

27. The power battery pack according to claim 1, wherein the surface area of the unit cell (100) is S, the volume of the unit cell (100) is V, and wherein the ratio of S to V satisfies 0.15 mm ^-1 ≤S/V≤0.2 mm ^-1 。

28. The power battery pack according to claim 25, wherein the first direction (A1) is a vehicle body width direction, and the second direction (A2) is a vehicle body length direction; alternatively, the first direction (A1) is a vehicle body longitudinal direction, and the second direction (A2) is a vehicle body width direction.

29. An electric vehicle comprising the power cell pack of any one of claims 1-28.

30. The electric vehicle of claim 29, characterized in that the power battery pack is disposed at a bottom of the electric vehicle, and the receiving device (200) is fixedly connected with a chassis of the electric vehicle.

31. The electric vehicle of claim 29, characterized in that the electric vehicle comprises a power battery pack disposed at a bottom of the electric vehicle, the accommodating device (200) is fixedly connected with a chassis of the electric vehicle, the first direction (A1) is a vehicle body width direction of the electric vehicle, and the second direction (A2) is a vehicle body length direction of the electric vehicle.

32. The electric vehicle according to claim 29, characterized in that the housing means (200) has a width L3 in the first direction (A1) and a body width W, wherein the ratio of L3 and W satisfies: L3/W is more than or equal to 50% and less than or equal to 80%.

33. The electric vehicle according to claim 29, characterized in that the length of the single battery (100) in the first direction (A1) is L4, the vehicle body width is W, wherein the ratio of L4 and W satisfies: L4/W is more than or equal to 40% and less than or equal to 70%.

34. An energy storage device comprising the power cell pack of any one of claims 1-28.