CN110379962B

CN110379962B - Power battery pack, energy storage device and electric vehicle

Info

Publication number: CN110379962B
Application number: CN201910544943.3A
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: 2020-10-23
Anticipated expiration: 2039-06-21
Also published as: CN112201895A; CN112271391A; CN112271393B; CN112201895B; CN112271392A; CN112271391B; CN110379962A; CN112271392B; CN112271393A

Abstract

The utility model relates to a power battery package, energy memory and electric motor car, this power battery package includes accommodate device (200) and sets up a plurality of battery cell (100) in accommodate device (200), accommodate device (200) include along first direction (A1) relative first frame (201) and second frame (202) that set up, a plurality of battery cell (100) set up between first frame (201) and second frame (202), the length of battery cell (100) along first direction (A1) is L1, the distance along first direction (A1) between the internal surface of first frame (201) and the internal surface of second frame (202) is L2, wherein, satisfy L1/L2 ≥ 50%. Through above-mentioned technical scheme, only set up a single cell along first direction to accessible single cell itself plays the effect of crossbeam and/or longeron, improves accommodate device's volume utilization ratio.

Description

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, power battery package mainly includes accommodate device and installs a plurality of battery module in accommodate device, and battery module mainly forms by a plurality of battery cell assembly, and accommodate device includes bottom plate and boundary beam usually, and the boundary beam setting is around the bottom plate. In order to provide the receiving device with sufficient strength and facilitate the installation of the battery modules, a plurality of cross beams and longitudinal beams are generally disposed between the side beams, and the plurality of cross beams and longitudinal beams, together with the side beams and the bottom plate, define a plurality of receiving spaces for receiving the battery modules, each of the battery modules being disposed in the corresponding receiving space.

The power battery pack at least has the following disadvantages:

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;

secondly, the traditional power battery pack contains a plurality of battery modules, each battery module needs to be fixed with the cross beam in the assembling process, a large number of fasteners such as screws need to be used for fastening the modules, and meanwhile, the cross beam or the longitudinal beam has certain weight, so that the weight of the accommodating device is increased;

thirdly, the accommodating device is internally provided with a cross beam and a longitudinal beam, so that the structure is complex, and the complexity of the manufacturing process of the accommodating device is increased;

fourthly, the single battery needs to be assembled into the accommodating device after the battery module, the operation steps are complex, if the single battery is directly placed into the accommodating device, the cross beam and the longitudinal beam in the accommodating device are easy to collide with the single battery, and therefore the single battery is damaged.

Disclosure of Invention

The purpose of the present disclosure is to provide a power battery pack, an energy storage device and an electric vehicle, wherein the power battery pack can effectively improve the volume utilization rate of a containing device and reduce the weight of the containing device, thereby improving the cruising ability of the power battery pack and realizing the light weight of the power battery pack.

In order to achieve the above object, a first aspect of the present disclosure provides a power battery pack, including a receiving device and a plurality of battery cells disposed in the receiving device, where the receiving device includes a first frame and a second frame disposed opposite to each other along a first direction, the plurality of battery cells are disposed between the first frame and the second frame, a length of the battery cells along the first direction is L1, and a distance between an inner surface of the first frame and an inner surface of the second frame along the first direction is L2, where L1/L2 is equal to or greater than 50%.

Optionally, a first end of each of the unit cells is supported by the first frame, and a second end of each of the unit cells is supported by the second frame.

Optionally, the content satisfies 80% ≦ L1/L2 ≦ 97%.

Optionally, the receiving device is a vehicle tray.

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

Optionally, the receiving means is formed on an electric vehicle.

Optionally, the receiving means is a downwardly concave cavity.

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

Optionally, the extension of the first sidewall and the extension of the first 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 in 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 of the unit batteries is disposed with the first direction as a length direction.

Optionally, the accommodating device includes a third frame and a fourth frame disposed oppositely 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 to a cell disposed adjacent to the third frame toward the fourth frame, and the fourth frame applies a force to the cell disposed adjacent to the fourth frame toward the third frame.

Optionally, a first elastic buffer plate is arranged between the third frame and the single battery adjacent to the third frame, and/or a second elastic buffer plate is arranged between the fourth frame and the single battery adjacent to the fourth frame.

Optionally, the first end of each of the single batteries is fixed to the first frame, and the second end of each of the single batteries is fixed to the second frame.

Optionally, a first end plate is arranged between the first end of at least some of the plurality of unit batteries and the first frame; a second end plate is arranged between the second end of at least part of the single batteries in the plurality of single batteries and the second frame; the first end of at least part of the single batteries is supported on the first frame through the first end plate, and the second end of at least part of the single batteries is 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.

Optionally, a module bottom plate is arranged below at least some of the single batteries, and the at least some of the single batteries are supported on the first frame and the second frame through the module bottom plate; the module bottom plate and at least part of the single batteries form a battery module.

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

Optionally, the accommodating device is provided with a third frame and a fourth frame along a second direction different from the first direction, a first side plate is provided at one side of the third frame, which is faced by the single battery adjacent to the third frame, and a second side plate is provided at one side of the fourth frame, which is faced by the single battery adjacent to the fourth frame, and the battery module is composed of 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.

Optionally, the number of the battery modules is at least two in a second direction different from the first direction.

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

Optionally, the single cell is a square cell of a cuboid structure, and has a length L, a thickness D and a height H between the length L and the thickness D, each of the single cells is placed on its side, each of the single cells has a length direction in the first direction and a thickness direction in the second direction, and has a height direction in the third direction, and the two adjacent single cells are arranged in a manner of facing a large surface.

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

Optionally, the first frame is provided with a first fixing portion, and the second frame is provided with a second fixing portion; the first end of each single battery is fixed to the first fixing portion, and the second end of each single battery is fixed to the second fixing portion.

Optionally, the ratio of the length L and the thickness D of the single battery satisfies 50 ≦ L/D ≦ 70.

Optionally, the ratio of the surface area S to the volume V of the single battery satisfies 0.15 ≦ S/V ≦ 0.2.

Optionally, the ratio of the surface area S of the single battery to the energy E satisfies 250 ≦ S/E ≦ 400.

Optionally, the single battery is a metal-case prismatic battery.

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 top plate is a liquid cooling plate or a direct cooling plate with a cooling structure arranged inside.

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, an explosion-proof valve is arranged at the first end of each single battery, which faces the first frame, an exhaust channel is arranged inside the first frame, an air inlet is arranged at a position on the first frame, which corresponds to the explosion-proof valve of each single battery, and is communicated with the exhaust channel, and an exhaust hole communicated with the exhaust channel is arranged on the accommodating device; and/or the battery cell orientation the second frame the second end is provided with explosion-proof valve, the inside exhaust passage that is provided with of second frame, on the second frame with every battery cell the position that explosion-proof valve corresponds all is provided with the air inlet, the air inlet with the exhaust passage intercommunication, accommodate device is last be provided with the exhaust hole of exhaust passage intercommunication.

Optionally, the first direction is a vehicle body width direction, and the second direction is a vehicle body length direction; or, the first direction is a vehicle body length direction, and the second direction is a vehicle body width direction.

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 disposed at the bottom of the electric vehicle, and the accommodating device is fixedly connected to a 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 is fixedly connected to the chassis of the electric vehicle, the first direction is a vehicle width direction of the electric vehicle, and the second direction is a vehicle length direction of the electric vehicle.

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

Optionally, a ratio of a length L4 of the unit battery in the first direction to a vehicle body width 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, which includes the power battery pack of any one of the first aspects.

Through the technical scheme, in this disclosure, the single battery is extended between the first frame and the second frame that the accommodating device set up relatively, the first end and the second end of the single battery can be adapted with the first frame and the second frame, the single battery can be supported on the first frame and the second frame, thereby reduce the use of crossbeam and/or longeron in the accommodating device, even can not use crossbeam and/or longeron in the accommodating device, thereby reduce the space that crossbeam and/or longeron occupy in the accommodating device, the space utilization of accommodating device has been improved, make more single batteries can arrange in the accommodating device as far as possible, and then improve the capacity, voltage and the duration of whole power battery package. 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 because the containing device does not need to arrange cross beams and/or longitudinal beams, on one hand, the manufacturing process of the containing device is simplified, the assembly complexity of the single batteries is reduced, and the production cost is reduced, and on the other hand, the weight of the containing device and the whole power battery pack is reduced, and 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, compare the battery cell in prior art, the battery cell that this disclosure provided extends between first frame and second frame, battery cell's both ends support respectively on first frame and second frame, battery cell itself alright be used as crossbeam or the longeron of strengthening accommodate device structural strength, that is to say, need not to set up the additional strengthening who is used for strengthening its structural strength among the accommodate device again, direct through battery cell itself alright replace additional strengthening to guarantee accommodate device's structural strength, ensure that accommodate device is difficult for taking place deformation under the exogenic action. Moreover, under the condition of constant volume, because the size and the length of the single battery in the prior art are small and short, the two opposite ends of the single battery cannot be matched with two edge beams (a first frame and a second frame, or a first side wall and a second side wall) which are oppositely arranged in the accommodating device; because the length of the first direction of the edge of the single battery in this disclosure is longer, can make its thickness along the second direction that is different from the first direction thinner to make, single battery's surface area is greater than the surface area of single battery among the prior art, thereby can increase single battery's heat radiating area, improve single battery's rate of heat dissipation, and then improved the security of whole power battery package, make power battery package safe and reliable more.

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

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

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

According to still another aspect of the present disclosure, an energy storage device is provided, and the energy storage device comprises the power battery pack.

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

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

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

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

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

fig. 4 is a schematic diagram illustrating an arrangement of a plurality of unit batteries 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 accordance with an embodiment of the present disclosure;

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

FIG. 7 is a schematic perspective view of a containment device according to yet another embodiment of the present disclosure;

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

FIG. 9 is a cut-away perspective view of a power battery pack provided in accordance with an 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 in another embodiment of the present disclosure, wherein the first and second rims are not shown;

fig. 12 is an exploded view of a power battery pack provided in accordance with an embodiment of the present disclosure;

fig. 13 is a schematic perspective view of a first side plate or a second side plate according to an embodiment of the present disclosure;

fig. 14 is a schematic perspective view of a first end plate or a second end plate according to an embodiment of the present disclosure;

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

fig. 16 is a schematic perspective view illustrating a structure of an accommodating device (cavity) formed on an electric vehicle according to an embodiment of the present disclosure;

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

FIG. 18 is a schematic plan view of a liquid-cooled panel provided in accordance with another embodiment of the present disclosure;

FIG. 19 is a schematic plan view of a liquid-cooled panel provided in accordance with yet another embodiment of the present disclosure

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

fig. 21 is a schematic perspective view of a receiving device (vehicle tray) 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, wherein a plurality of battery modules are provided.

Description of the reference numerals

100 first electrode of single battery 101

102 second electrode 103 explosion-proof valve

200 receiving means 201 first frame

202 second bezel 203 third bezel

204 fourth rim 205 first elastic buffer plate

206 second resilient buffer plate 207 first end plate

208 second end plate 209 first side plate

210 second side plate 211 bottom plate of module

212 Top plate 213 first support step of Module

214 second support step 215 first fixing portion

216 second fixed part 217 thermal insulation layer

218 heat conduction layer 219 liquid cooling plate

220 direct cooling plate 221 air inlet

222 exhaust passage 223 gas-liquid separator

224 coolant line 225 coolant inlet

226 coolant outlet 227 inlet manifold

228 outlet manifold 229 coolant inlet

230 coolant outlet

300 cavity 301 first side wall

302 second side wall 305 bottom of cavity

400 battery module 500 crossbeam

600 longitudinal beam

A1 first direction A2 second direction

A3 third Direction

L length of cell D thickness of cell

Height of H single battery

L1 distance between first and second ends of single battery/length of single battery along first direction

L2 distance between inner surface of first bezel and inner surface of second bezel/distance between first sidewall and second sidewall along first direction

L3 width of accommodating device in first direction

Length of L4 single battery in first direction

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, the terms of orientation or positional relationship such as "upper, lower, left, right, top, bottom" and the like are used for the purpose of convenience of description and simplification of description based on the orientation and positional relationship shown in the drawings, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus should not be construed as limiting the present invention, and "inner and outer" refer to the inside and outside of the outline of the corresponding structure.

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

In addition, in the present disclosure, the terms "front, rear, left, and right" generally refer to the front, rear, left, and right of the vehicle itself, and specifically, the direction toward the left wheel is the left, the direction toward the right wheel is the right, the direction toward the head is the front, and the direction toward the tail is the 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 single batteries 100 disposed in the receiving device 200, each single battery 100 including a first end and a second end opposite to each other, the receiving device 200 including a first rim 201 and a second rim 202 opposite to each other along a first direction a1, the plurality of single batteries 100 being disposed between the first rim 201 and the second rim 202, in one embodiment, the first end of each single battery 100 is supported by the first rim 201, and the second end of each single battery 100 is supported by the second rim 202.

In other words, each unit cell 100 extends between the first frame 201 and the second frame 202, and the plurality of unit cells 100 are arranged along the length direction of the first frame 201 and the second frame 202, i.e., along the second direction a 2. Alternatively, the accommodating device 200 may be plural, or may be one.

Here, the first end and the second end of the single battery 100 are supported on the first frame 201 and the second frame 202, respectively, and the single battery 100 may be directly supported by the first frame 201 and the second frame 202, i.e., placed on the first frame 201 and the second frame 202, respectively, or may be further fixed on the first frame 201 and the second frame 202, and a specific fixing manner is described in detail below, and the present disclosure is not limited to a specific supporting and fixing manner.

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 single battery 100, where the matching means that the distance between the two frames or the two side walls described below can be matched with one single battery 100, and the matching may be various matching methods such as a clearance fit, an interference fit, a fastening fit, a fixing fit, 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. The direct meaning means that the first end of the single battery 100 is directly contacted and matched with the first frame 201 for supporting, and the second end of the single battery 100 is directly contacted and matched with the second frame 202; by indirect, it is meant that, for example, in some embodiments, a first end of the cell 100 is supported by the first end plate 207 in cooperation with the first frame 201, and a second end of the cell 100 is supported by the second end plate 208 in cooperation with the second frame 202.

It should be noted that the first frame 201 and the second frame 202 are disposed oppositely, and the first frame 201 may be parallel to each other, may also be disposed at an angle, and may be a straight line structure or a curved line structure. The single battery 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 with respect 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 single battery 100 may form a rectangular, square or parallelogram, fan-shaped structure, etc.; when the first frame 201 and the second frame 202 are at an angle, the first frame 201, the second frame 202 and the single battery 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 batteries 100 and the first frame 201 and the second frame 202.

The first rim 201 and the second rim 202 are located at opposite sides of the accommodating device 200 along the first direction a1, which means that, as shown in fig. 3, the first rim 201 and the second rim 202 are located at the outermost sides of the accommodating device 200 along the first direction a1, and the first rim 201 and the second rim 202 are the outermost sides of the accommodating 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 electrode and the negative electrode of the unit cell 100, that is, in the present disclosure, the end of the unit cell 100 supported by the first frame 201 is the first end, and the end of the unit cell 100 supported by the second frame 202 is the second end.

In the prior art, because the size of the single battery is small, the length of the single battery is short, and the two opposite ends of the single battery cannot be matched with the two oppositely-arranged edge beams in the accommodating device, a cross beam 500 and/or a longitudinal beam 600 (shown in fig. 1) need to be arranged in the accommodating device, thereby facilitating the assembly of the single battery. When the single battery is installed in the accommodating device through the battery module, a plurality of single batteries may exist along the first direction of the accommodating device, that is, the single battery does not extend between two oppositely arranged edge beams (the first frame 201 and the second frame 202, or the first side wall 301 and the second side wall 302), but extends between two oppositely arranged cross beams 500 or longitudinal beams 600, and the battery module is fixed with the adjacent cross beams 500 and/or longitudinal beams 600 through fasteners.

Because the cross beam and/or the longitudinal beam are arranged in the accommodating device in the prior art, the cross beam and/or the longitudinal beam 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 low, generally, the volume utilization rate of the accommodating device is about 40% or even lower, that is, only about 40% of the space in the accommodating device in the prior art can be used for installing the single batteries, so that 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 single battery 100 extends between the first frame 201 and the second frame 202, which are oppositely disposed in the accommodating device 200, the first end and the second end of the single battery 100 may be matched with the first frame 201 and the second frame 202, and the single battery 100 may be supported on the first frame 201 and the second frame 202, so as to reduce the usage of the cross beam and/or the longitudinal beam in the accommodating device 200, and even the cross beam and/or the longitudinal beam may not be used in the accommodating device 200, 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, enabling as many single batteries 100 as possible to be arranged in the accommodating device 200, and further improving the capacity, voltage and endurance of the entire 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%.

In addition, since no cross beam and/or longitudinal beam is 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, and 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, and 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, compare in the battery cell 100 among the prior art, the battery cell 100 that this disclosure provided extends between first frame 201 and second frame 202, the both ends of battery cell 100 support respectively on first frame 201 and second frame 202, battery cell 100 itself alright be used as the crossbeam or the longeron of strengthening accommodate device 200 structural strength, that is to say, need not to set up the additional strengthening structure who is used for strengthening its structural strength among the accommodate device 200 again, direct through battery cell 100 itself alright replace additional strengthening structure to guarantee the structural strength of accommodate device 200, ensure that accommodate device 200 is difficult for taking place the deformation under the exogenic action. Moreover, under the condition of constant volume, because the single battery in the prior art has a small size and a short length, the opposite ends of the single battery cannot be matched with two edge 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) oppositely arranged in the accommodating device; because the length of the single battery 100 in the first direction a1 in this disclosure is longer, the thickness of the single battery 100 in the second direction a2 different from the first direction a1 can be thinner, so that the surface area of the single battery 100 is larger than that of the single battery in the prior art, thereby the heat dissipation area of the single battery 100 can be increased, the heat dissipation rate of the single battery 100 is increased, the safety of the whole power battery pack is further improved, and the power battery pack is safer and more reliable.

On 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, a first end of each unit cell 100 is fixed on the first frame 201, and a second end is fixed on the second frame 202. Here, there are various manners of fixing, for example, a first end of each unit battery 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 battery 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 single battery 100 are fixed on the first frame 201 or the second frame 202 by dispensing. The present disclosure does not limit a specific manner of fixing the first and second ends of the unit battery 100 to the first and

second rims

201 and 202.

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

In the tray for the vehicle, the width of the vehicle body is large, such as 1.2m-2 m; longer length, such as between 2m and 5 m; the corresponding vehicle body width and the vehicle body length are different for different vehicle types. The tray arranged at the bottom of the vehicle body has larger overall size requirement due to larger width and length of the vehicle body; the great tray size leads to in prior art, must still need set up the crossbeam in the tray inside except that setting up the frame that is located the avris on the tray, just can provide sufficient holding power and structural strength for inside battery cell that sets up. 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; simultaneously, because the existence of crossbeam, for the installation of cooperation crossbeam, must set up a plurality of battery module in tray inside width and length direction, the installation is complicated, and the mounting structure spare that needs is also more.

Then, if the cross beam is removed, the module layout and the single battery 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, both ends of the unit cell 100 are supported on the first frame 201 and the second frame 202, and the weight of the unit cell is divided into two tray frames; on the basis of removing the cross beam, the bearing capacity of the tray is effectively improved; meanwhile, the single battery 100 can also 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 used in a vehicle, the first direction a1 of the unit batteries 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 batteries 100 in the first direction a1 may be 500mm to 1000mm, so that the length of the unit batteries 100 can be adapted to the width of the vehicle.

In another embodiment provided by the present disclosure, as shown in fig. 16, the accommodating device 200 may also be formed directly on the electric vehicle, that is, the accommodating device 200 is a device formed at any suitable position on the electric vehicle for mounting the single battery 100. 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 accommodating device has a first frame 201 and a second frame 202 disposed opposite to each other, wherein the distance between the first frame 201 and the second frame 202 matches with the distance between the first end and the second end of the single battery 100 in the first direction, where the matching means that the distance between the two frames or the two side walls in the following can match with each other to mount one single battery 100, and the matching may be various matching manners such as clearance fit, interference fit, fastening fit, fixing fit, and the like, thereby achieving the purpose of the present disclosure.

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

In a specific embodiment provided by the present disclosure, the cavity 300 may include a first side wall 301 and a second side wall 302 which are oppositely disposed, and optionally, the first frame 201 and/or the second frame 202 may be extended downward from the chassis of the electric vehicle. The first frame 201 is an extension of the first sidewall 301 and the first sidewall 301 of the chamber 300, and the second frame 202 is an extension of the second sidewall 302 and the second sidewall 302 of the chamber 300. Thus, as an alternative embodiment, the first end of the unit battery 100 may be supported on the extension portion of the first sidewall 301, and the second end of the unit battery 100 may be supported on the extension portion of the second sidewall 302. That is, the present disclosure also provides an electric vehicle capable of arranging the unit cells 100 according to the above technical solution, and the electric vehicle is formed with a cavity 300 having the same characteristics as the separate vehicle tray, thereby constituting the battery housing 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 a bottom 305 of the cavity 300, and in an embodiment, the extension of the first sidewall 301 meets the extension of the second sidewall 302, so that the cavity 300 is formed as the cavity 300 having a U-shaped groove recessed downward, and the unit cell 100 can be supported by the bottom 305 of the cavity 300. In another embodiment, the extension of the first sidewall 301 may be spaced apart from the extension of the second sidewall 302.

Referring back to the unit cell 100, as shown in fig. 3 to 6, in some embodiments, the unit cell 100 is perpendicular to the first frame 201 and the second frame 202, a distance between the first end and the second end of the unit cell 100 is L1, and a distance between an inner surface of the first frame 201 and an inner surface of the second frame 202 is L2, wherein a ratio of L1 to L2 satisfies L1/L2 ≧ 50%. In other words, only one unit battery 100 is arranged between the first frame 201 and the second frame 202 along the first direction a1, and the relationship of the distance between the unit battery 100 and the two frames is arranged in the first direction a1, so that the unit battery 100 can serve as a cross beam or a longitudinal beam. In the exemplary embodiment provided by the present disclosure, only one single battery 100 is arranged between the first frame 201 and the second frame 202 along the first direction a1, so that the single battery 100 itself can be used as a cross beam or a longitudinal beam for enhancing the structural strength of the accommodating device 200, and in other possible embodiments, such a size ratio is satisfied.

In some embodiments, the ratio of L1 to L2 may satisfy 80% to L1/L2 to 97%, so that the first end and the second end of the battery 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 distribute and transmit the force through the structure of the battery cell 100 itself, ensure that the battery cell 100 can be used as a beam or a stringer for reinforcing the structural strength of the container 200, and ensure that the container 200 has sufficient strength to resist the deformation of 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 in a second direction a2 different from the first direction a 1. The plurality of unit cells 100 may be arranged at intervals in the second direction a2, or closely arranged, as shown in fig. 3, in the present embodiment, closely arranged in the second direction a2 perpendicular to the first direction a1 to make full use of space.

In one embodiment provided by the present disclosure, the first direction a1 may be perpendicular to the second direction a2, 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, i.e., a thickness direction of each unit cell 100. That is, the first frame 201 and the second frame 202 are perpendicular to the unit batteries 100, and both ends of each unit battery 100 in the length direction are supported on the first frame 201 and the second frame 202. Like this, when first frame 201 and/or second frame 202 received external force and assault, a plurality of battery cells 100 can carry out the conduction and the dispersion of power to better play additional strengthening's effect, improve accommodate device 200 and resist the ability of external force deformation. In this embodiment, as shown in fig. 3, the first frame 201 and the second frame 202 are linear structures, and the second direction a2 is a linear direction, in some possible embodiments, the first frame and the second frame may be curved structures, in which case the first direction may also 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 a 3. In other words, the plurality of unit batteries 100 are arranged in a plurality of layers stacked in the third direction a3, the plurality of unit batteries 100 in each layer are located between the first frame 201 and the second frame 202, and the number of layers of the unit batteries 100 may be set according to the size of the receiving device 200. In this way, a plurality of single batteries 100 can be arranged as many as possible in the limited space of the accommodating device 200, so that the volume utilization rate of the accommodating device 200 is further improved, and the capacity, voltage and endurance of the power battery pack are improved. In an 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 a 2. 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 each layer may or may not be connected to each other, and the disclosure is not limited thereto.

In the above embodiment, the single batteries stacked in the third direction may be single batteries whose two ends are matched with the first frame and the second frame, or may be single batteries directly placed on top of the next layer of single batteries without being matched with the first frame and the second frame for supporting or connecting.

In one embodiment, as shown in fig. 2 to 4, the first electrode 101 of the single battery 100 is led out from the single battery 100 towards the first end of the first frame 201, and the second electrode 102 of the single battery 100 is led out from the single battery 100 towards the second end of the second frame 202. In other words, the length direction of the unit battery 100 may be the current direction inside the unit battery 100, that is, the current direction inside the unit battery 100 is the first direction a 1. Thus, since the current direction is the same as the length direction of the unit battery 100, the effective heat dissipation area of the unit battery 100 is larger, and the heat dissipation efficiency is better. Here, the first electrode 101 may be a positive electrode of the unit battery 100, and the second electrode 102 is a negative electrode of the unit battery 100; alternatively, the first electrode 101 is a negative electrode of the unit battery 100, and the second electrode 102 is a positive electrode of the unit battery 100.

The unit cells 100 may have any suitable structure and shape, and in one embodiment provided by the present disclosure, as shown in fig. 2, the unit cells 100 are rectangular cells having a rectangular parallelepiped structure and have a length, a thickness and a height between the length and the thickness, each unit cell 100 is placed on its side, the length direction of each unit cell 100 is a first direction a1, the thickness direction is a second direction a2, the height direction is a third direction A3, and two adjacent unit cells 100 are arranged in a large-to-large 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 above-mentioned length L, and the short side having the above-mentioned height H; the long side of the narrow side 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 single battery 100 is placed on the side, that is, two end faces of the single battery 100 respectively face the first frame 201 and the second frame, and the large faces of two adjacent single batteries 100 are opposite, so that the single battery 100 has a function of replacing a cross beam, and the single battery 100 has a better effect and higher strength. In other embodiments, the unit cell 100 may also be a cylindrical battery.

In the prior art, how to design the shape and size of the single battery 100 to have not only a proper battery capacity and a good heat dissipation effect is 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 battery 100 satisfies 50L/D70. Under the ratio, the single battery 100 with longer length and thinner thickness can be obtained, so that under the condition that the length of the single battery 100 extends along the first direction A1, proper resistance value, higher heat dissipation area and heat dissipation efficiency can be kept, and the adaptability of various vehicle types is good.

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 ≦ S/V ≦ 0.2. Under this ratio, can be longer through above-mentioned length, the thin battery cell 100 of thickness realizes, also can realize through the adjustment of size, through the ratio of the superficial area S of control battery cell 100 and volume V, when can guarantee that battery cell 100 'S length extends along first direction A1, possesses sufficient heat radiating area to guarantee battery cell 100' S radiating effect.

In still another embodiment provided by the present disclosure, the ratio of the surface area S to the energy E) of the unit cell 100 satisfies 250 ≦ S/E ≦ 400. At this ratio, the single battery 100 having a long length and a thin thickness can still be obtained, and also, the ratio can be increased by the above-mentioned length. The single battery with the small thickness can be realized, and can also be realized by adjusting other sizes. By controlling the ratio of the surface area S of the single battery 100 to the energy E, the surface area of the single battery 100 can meet the heat dissipation requirement while the single battery 100 has a certain energy E.

In some embodiments, in an implementation manner provided by the present disclosure, the single battery 100 may be a metal-casing prismatic battery, that is, the casing of the single battery 100 is made of a metal material, and the heat conductivity of the metal is better, so that 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 battery cell 100 may be a pouch battery, and the pouch battery refers to a polymer housing on a liquid lithium ion battery, and is structurally packaged by an aluminum-plastic film, and when a potential safety hazard occurs, the pouch battery will blow and crack, and will not explode, thereby improving the safety performance of the battery cell 100.

In addition, in one embodiment provided by the present disclosure, as shown in fig. 3 to 8, the containing 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 are arranged between the third frame 203 and the fourth frame 204 along the second direction a 2. Alternatively, in one embodiment, the first direction a1 may be perpendicular to the second direction a2, and the first rim 201 and the second rim 202 are perpendicular to and connected to the third rim 203 and the fourth rim 204, such that the container 200 is formed in a rectangular or square shape. In other embodiments, the first frame 201 and the second frame 202 may be parallel to each other, and the third frame 203 and the fourth frame 204 may be disposed at an angle to the first frame 201 and the second frame 202, so that the accommodating device 200 is formed in a trapezoid shape, a parallelogram shape, or the like. The present disclosure does not limit the specific shape of the accommodating device 200 formed by the first frame 201, the second frame 202, the third frame 203 and the fourth frame 204.

It should be noted that, whether the accommodating device 200 is a separately produced vehicle tray for accommodating and mounting the single battery 100 or a cavity 300 integrally formed with a chassis of the electric vehicle, the shape and structure of the accommodating device are substantially the same, and the structure in which 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 are mounted in the vehicle tray is also applicable to the cavity 300, and the dimensional relationship between the vehicle tray and the single battery 100 is also applicable to the cavity 300 and the single battery 100.

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

In some embodiments, as shown in fig. 3, the third frame 203 applies a force to the unit cell 100 adjacent to the third frame 203 toward the fourth frame 204, and the fourth frame 204 applies a force to the unit cell 100 adjacent to the fourth frame 204 toward the third frame 203, 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 batteries 100 in the second direction a2, and particularly, when the unit batteries 100 are slightly expanded, may buffer and provide an inward pressure to the unit batteries 100, so as to prevent the unit batteries 100 from being excessively expanded and deformed. 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 may be effectively limited by the third frame 203 and the fourth frame 204, so that when the unit cell 100 fails and expands, the inside thereof may have sufficient air pressure to burst the turnover sheet inside the explosion-proof valve 103 or the Current Interrupt Device (CID) device, thereby short-circuiting the unit cell 100, ensuring the safety of the unit cell 100, and preventing the unit cell 100 from exploding.

Alternatively, as shown in fig. 12 and 13, a first elastic buffer plate 205 may be 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 may be disposed 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 are closely arranged by 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 distance between the third frame 203 and the fourth frame 204.

In one embodiment, as shown in fig. 2 and 10, the single battery 100 is provided with an explosion-proof valve 103 at a first end facing a first frame 201, an exhaust channel 222 is provided inside the first frame 201, an air inlet 221 is provided on the first frame 201 at a position corresponding to the explosion-proof valve 103 of each single battery 100, the air inlet 221 is 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, the second frame 202 is internally provided with an exhaust channel 222, the second frame 202 is provided with an air inlet 221 corresponding to the explosion-proof valve 103 of each single battery 100, 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 rim 201, and/or the second end plate 208 and the second rim 202.

In the prior art, in the use of battery cell, if its inside atmospheric pressure increases to certain degree, then the explosion-proof valve is opened, and inside flame, smog or the gas of battery cell can discharge through the explosion-proof valve, and this flame, smog or gas are gathered in the inside of power battery package, if can't discharge in time, then can cause secondary damage to battery cell. However, in the present disclosure, since the first frame 201 and/or the second frame 202 is provided with the air inlet 221 corresponding to the explosion-proof valve 103 of the battery cell 100, and the first frame 201 and/or the second frame 202 is provided with the air exhaust channel 222 inside, when the air pressure inside the battery cell 100 increases, the explosion-proof valve 103 thereof is opened, and the flame, smoke, or gas inside thereof will directly enter the air exhaust channel 222 inside the first frame 201 and/or the second frame 202 through the air inlet 221 and be exhausted out of the first frame 201 and/or the second frame 202 through the air exhaust hole, for example, to the atmosphere, so that the flame, smoke, or gas will not be gathered inside the accommodating device 200, thereby avoiding the flame, smoke, or gas from causing secondary damage to the battery cell 100.

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

second rims

201 and 202, respectively. In another embodiment provided by 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 idea of the present disclosure, the technical effect of the present disclosure can be also achieved through the external structure of the battery module and the matching relationship between the first frame and the second frame.

In one embodiment, a first end plate is arranged between the first end of at least some of the plurality of single batteries and the first frame; a second end plate is arranged between the second end of at least part of the single batteries in the plurality of single batteries and the second frame; the first end of at least part of the single batteries is supported on the first frame through the first end plate, and the second end of at least part of the single batteries is 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 part of the plurality of unit batteries 100, as shown in fig. 12 and 14, one unit battery 100 adjacent to the first frame 201 is provided with a first end plate 207 at an end toward the first frame 201; at least one of the plurality of unit batteries 100 adjacent to the second frame 202 is provided with a second end plate 208 at an end of the unit battery 100 facing the second frame 202; each unit cell 100 is supported on the first frame 201 by a first end plate 207, and each unit cell 100 is supported on the second frame 202 by a second end plate 208; the first end plate 207, the second end plate 208, and at least a portion of the plurality of unit batteries 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 batteries 100 form a battery module, which is supported between the first frame 201 and the second frame 202 by the first end plate 207 and the second end plate 208. The number of the first end plates 207 may be multiple, the number of the second end plates 208 may be multiple, the first end plates 207, the second end plates 208, and the single batteries 100 constitute a plurality of battery modules, each battery module is supported between the first frame 201 and the second frame 202 by the corresponding first end plates 207 and second end plates 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 some of the single batteries 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 batteries 100 constitute the battery module. In other words, a module bottom plate 211 is disposed under at least a portion of the plurality of unit batteries 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 at least a portion of the plurality of unit batteries 100 form 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 during installation, after the plurality of unit batteries 100 are arranged in the accommodating space, the first end plate 207 and the second end plate 208 are supported on the first frame 201 and the second frame 202. The module base plate 211 may be a plurality of such that a plurality of battery modules are constructed with the plurality of first and

second end plates

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

In some embodiments, a module top plate 212 is disposed above at least some of the single batteries 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 batteries 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 batteries 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 batteries 100 form a battery module. In other words, the module top plate 212 is located on the top of the first end plate 207 and the second end plate 208, the module bottom plate 211 is located on the bottom of the first end plate 207 and the second end plate 208, and the unit batteries 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 batteries 100 from moving up and down, and the stability of the unit batteries 100 is increased.

In some embodiments, 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, which faces 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, which faces 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 part of the plurality of unit cells 100 form a battery module. The number of the battery modules 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 frame 201, the second end plate 208 is fixed on the second frame 202, the first side plate 209 is fixed on the third frame 203, the second side plate 210 is fixed on the fourth frame 204, 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 jointly define a closed accommodating space for accommodating the plurality of unit batteries 100, and thus, when the single battery 100 fails and fires, 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 can control the failure of the single battery 100 within a certain range, and prevent the explosion of the single battery 100 from 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 the expansion deformation of the plurality of unit batteries 100, thereby ensuring the 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 single batteries 100 in the plurality of single batteries 100, and the at least some of the single batteries 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 at least a part of the unit batteries 100 constitute a battery module. In other words, a module bottom plate 211 is disposed below at least a portion of the plurality of unit batteries 100, and each unit battery 100 is supported on the first frame 201 and the second frame 202 by the module bottom plate 211; the module bottom plate 211 and at least part of a plurality of battery cells 100 constitute the battery module, and in this embodiment, a plurality of battery cells 100 pass through the module bottom plate 211 and support on first frame 201 and second frame 202, have simplified the structure of battery module, do benefit to the lightweight that realizes power battery package.

In one embodiment, at least two battery modules are arranged in the second direction a2 different from the first direction a1, and a plurality of battery modules are arranged in the second direction a 2. In other embodiments, there may be one battery module.

The first end plate 207 and the second end plate 208, or the module base plate 211 may be supported on the first frame 201 and the second frame 202 through various embodiments, for example, the first frame 201 and the second frame 202 may be detachably fastened by fasteners; or fixed with the first frame 201 and the second frame 202 by welding; or connected with the first frame 201 and the second frame 202 in a dispensing manner; or directly prevented from being supported by the first bezel 201 and the second bezel 202 on the first bezel 201 and the second bezel 202.

In some embodiments, as shown in fig. 23, the power battery pack is arranged with a plurality of layers of the battery modules along the third direction a 3. For an embodiment in which the unit batteries 100 are disposed in the receiving device 200 through the battery modules, the battery modules may be a plurality of layers stacked in the third direction a3, with at least one battery module in each layer. Thus, 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 of which both ends are matched with the first frame and the second frame, or may be directly placed on the top of the next battery module without being matched with the first frame and the second frame for supporting or connecting.

In some embodiments, for the embodiment in which the battery module includes the module base plate 211, as shown in fig. 9 and 10, a heat insulation layer 217 may be disposed between the module base plate 211 and the single battery 100 to insulate the single battery 100 from heat transfer from the outside, so as to achieve the function of heat insulation of the single battery 100, and avoid thermal interference between the external environment outside the accommodating device 200 and the single battery 100 inside the accommodating device 200. Alternatively, the insulation layer 217 may be made of a material having an insulation function, for example, insulation 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 single battery 100 to facilitate heat dissipation of the single battery 100 and ensure that the temperature difference between the plurality of single batteries 100 is not too large. The thermally conductive plate 218 may be made of a material having good thermal conductivity, for example, the thermally conductive plate 218 may be made of a material having high thermal conductivity such as copper or aluminum.

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

In order to improve the cooling effect of the liquid cooling plate 219, as shown in fig. 17 to fig. 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 cooling liquid in which a gas state and a liquid state are mixed, after the gas-liquid mixed cooling liquid is subjected to gas-liquid separation by the gas-liquid separator 223, it may be ensured that the pure liquid phase cooling liquid enters the liquid cooling plate 219 to cool the single battery 100, and the cooling effect is ensured.

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

In another embodiment, as shown in fig. 18 and 19, a plurality of coolant pipes 224 are provided in the liquid cooling plate 219, the plurality of coolant pipes 224 are straight pipes and are arranged in parallel and spaced apart from each other, both ends of each coolant pipe 224 are respectively provided with a coolant inlet 225 and a coolant outlet 226 which are oppositely arranged, the coolant inlets 225 and the coolant outlets 226 of the plurality of coolant pipes 224 are sequentially arranged in spaced apart manner along the arrangement direction of the plurality of coolant pipes 224, the power battery pack further comprises a liquid inlet header 227 and a liquid outlet header 228, each coolant inlet 225 is communicated with the liquid inlet header 227, and each coolant outlet 226 is communicated with the liquid outlet header 228. As shown in fig. 18 and 19, a coolant inlet 229 is disposed on the inlet manifold 227, a coolant outlet 230 is disposed on the outlet manifold 228, and the coolant inlet 229 and the coolant outlet 230 are disposed 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 having a cooling structure therein, the direct cooling plate 220 is internally provided with a cooling medium, the cooling medium can be a cooling medium cooled by a vehicle air conditioning system, and the low-temperature cooling medium can effectively absorb heat of the battery cell 100, so that the temperature of the battery cell 100 is always maintained at a suitable 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 enable the first frame 201 and the second frame 202 to provide a supporting force to the unit battery 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; a first end of each unit cell 100 is supported on the first support step 213 and a 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 single battery 100 is supported by the bottom plate in the receiving device 200, in the present disclosure, the single battery 100 is supported by the first supporting step 213 and the second supporting step 214 provided on the first frame 201 and the second frame 202, so that 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. Alternatively, an insulating plate may be disposed on the first and second support steps 213 and 214, the insulating plate being located between the unit batteries 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, a first end of each unit battery 100 is fixed on the first fixing portion 215, and a second end of each unit battery 100 is fixed on the second fixing portion 216. Alternatively, the first fixing portion 215 may be a third supporting step disposed 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 disposed 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 the embodiment in which the plurality of unit cells 100 are provided with the first end plate 207 at one end adjacent to the first frame 201 and the second end plate 208 at one end adjacent to the second frame 202, the bottom of the first end plate 207 may be supported on the first support step 213, and the top or side wall of the first end plate 207 may be fixed on the first fixing portion 215; the bottom of the second end plate 208 may be supported on a second support step 214, and the top or side wall of the second end plate 208 may be fixed on a 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 vehicle body length direction of the vehicle, i.e., a front-rear direction of the vehicle, so that the unit batteries 100 function as a lateral reinforcement beam in the container 200 since the unit batteries 100 extend in the first direction a 1. In another embodiment provided by the present disclosure, the above-mentioned first direction a1 may be a vehicle body length direction of the vehicle, i.e., a front-rear direction of the vehicle, and the second direction a2 may be a vehicle body width direction, i.e., a left-right direction of the vehicle, so that the unit batteries 100 function as longitudinal reinforcing beams in the receiving device 200 since the unit batteries 100 extend in the first direction a 1.

According to another aspect of the present disclosure, an energy storage device is provided, and the energy storage device comprises the power battery pack. The energy storage device can be used for passenger vehicles, commercial vehicles, special vehicles, ships, standby power supplies (dps and ups), electric bicycles, electric motorcycles, electric scooters and other devices which need to use the single battery 100 to provide electric energy for the vehicles.

According to a further aspect of the present disclosure, an electric vehicle is provided, wherein at least one accommodating device 200 is formed on the electric vehicle, and the accommodating device 200 is the 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-mentioned power battery pack, wherein the receiving device 200 is a separately produced vehicle tray 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, and the like, which need to be powered by a power battery pack to drive the electric vehicle.

In some embodiments, the power battery pack is disposed at the bottom of the electric vehicle, and the accommodating device 200 is fixedly connected to the chassis of the electric vehicle. Because the installation space of the electric vehicle chassis is larger, the power battery pack is arranged on the electric vehicle chassis, 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 to the chassis of the electric vehicle, the first direction a1 is the body width direction of the electric vehicle, i.e., the left-right direction of the electric vehicle, and the second direction a2 is the body length direction of the electric vehicle, i.e., the front-back direction of the electric vehicle. In other embodiments, the electric vehicle may include a plurality of power battery packs disposed at a bottom of the electric vehicle, and the plurality of power battery packs may be identical or different in shape and size, and specifically, each power battery pack may be adjusted according to a shape and size of a chassis of the electric vehicle, and the plurality of power battery packs may be arranged along a length direction of a vehicle body, that is, a front-rear direction.

In some embodiments, 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 width W of the vehicle body satisfies: 50% ≦ L3/W ≦ 80%, and in the present embodiment, this may be achieved by providing only one accommodating device 200 in the width direction of the vehicle body, and when there are a plurality of accommodating devices 200, the plurality of accommodating devices 200 are arranged in the length direction of the vehicle body. Typically, for most vehicles, the body width is 500mm to 2000mm, e.g., 500mm, 1600mm, 1800mm, 2000mm, and the body length is 500mm to 5000mm, and for passenger vehicles, the width of the passenger vehicle is typically 500mm to 1800mm, and the length of the body is 500mm to 4000 mm.

In some embodiments, 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%. When the ratio of the length L4 of the unit battery 100 in the first direction a1 to the vehicle body width W satisfies, taking into account the thicknesses of the first frame 201 and the second frame 202 of the housing device 200: when the ratio of L4/W is 40% to 70%, only one cell 100 may be provided in the width direction of the vehicle body in the present embodiment. In other possible embodiments, in the case where such a size requirement is satisfied, it may be achieved by providing a plurality of battery modules or a plurality of unit batteries in the longitudinal direction. As an embodiment, the length L4 of the unit cell 100 in the first direction a1 is 500mm to 1000 mm.

It should be noted that, in some embodiments of the present invention, although a scheme is disclosed in which two ends of one single battery are respectively supported by the first frame and the second frame in a matching manner, in an actual production process, a single battery with a length dimension matching with a width of a vehicle body may not be manufactured; that is, the unit cells cannot be processed to a desired length for some reasons. Because the electric vehicle has requirements on the voltage platform of the single battery, and the volume of the single battery required by the electric vehicle is certain when the voltage platform is required to reach a certain value under a fixed material system; this makes it possible to reduce the thickness or width of the unit cell if the length thereof 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 on the premise; meanwhile, in the vehicle body, the height space is also limited, and in order to reduce the influence to the maximum extent, the width (height) of the single battery is not adjusted generally. Therefore, only the length of the unit cell in the first direction and the thickness of the unit cell in the second direction can be changed to change the surface area of the entire unit cell; therefore, if the length is increased, the thickness is reduced in a large probability. In fact, the thickness variation of the single battery has a minimum limit value because the battery core and related materials are required to be added inside the single battery; this makes the length of the single battery cell, which is affected by the limit value of the thickness, the length change capability in the first direction is limited, and the length of the single battery cell cannot be increased infinitely.

Therefore, in some embodiments, the above problem may be solved by providing two unit cells in the first direction. For example, in the scheme of originally arranging one single battery along the first direction, the length of the single battery along the first direction is 1000mm, and after the scheme is used, two single batteries are arranged along the first direction, and the length of each single battery is about 450 mm. Less than half of 1000mm because of the need to add mounting sites in the middle.

According to one aspect of the disclosure, a power battery pack comprises a containing device 200 and a plurality of single batteries 100 arranged in the containing device 200, wherein the containing device 200 comprises a first frame 201 and a second frame 202 which are oppositely arranged along a first direction A1, the plurality of single batteries 100 are arranged between the first frame 201 and the second frame 202, the length of the single batteries 100 along the first direction A1 is L1, the distance between the inner surface of the first frame 201 and the inner surface of the second frame 202 along the first direction A1 is L2, and L1/L2 is equal to or more than 50%.

Optionally, a first end of each of the single batteries 100 is supported by the first frame 201, and a second end of each of the single batteries 100 is supported by the second frame 202.

Optionally, the content satisfies 80% ≦ L1/L2 ≦ 97%.

Optionally, the accommodating device 200 is a vehicle tray.

Optionally, the length of the unit battery 100 along the first direction a1 is 500mm-1000 mm.

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

Optionally, the receiving means 200 is a downwardly concave cavity 300.

Optionally, the cavity 300 includes a first sidewall 301 and a second sidewall 302 opposite to each other, the first bezel 201 is an extension of the first sidewall 301 and the first sidewall 301 of the cavity 300, and the second bezel 202 is an extension of the second sidewall 302 and the second sidewall 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 single battery 100 is perpendicular to the first frame 201 and the second frame 202, and the length of the single battery 100 along the first direction a1 is the distance between the first end and the second end of the single battery.

Alternatively, the plurality of unit cells 100 are arranged in a second direction a2 different from the first direction a 1.

Optionally, the power battery pack is arranged with a plurality of layers of the single batteries 100 along a third direction a3, and the plurality of single batteries 100 in each layer are located between the first frame 201 and the second frame 202.

Alternatively, each of the unit batteries 100 is disposed with the first direction a1 as a length direction.

Optionally, the containing device 200 includes a third frame 203 and a fourth frame 204 oppositely arranged 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 a 2.

Optionally, the third rim 203 applies a force to the unit cell 100 disposed adjacent to the third rim 203 toward the fourth rim 204, and the fourth rim 204 applies a force to the unit cell 100 disposed adjacent to the fourth rim 204 toward the third rim 203.

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

Optionally, the first end of each unit battery 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 end of at least some of the single batteries 100 and the first frame 201; a second end plate 208 is arranged between the second end of at least some of the single batteries in the plurality of single batteries 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 battery 100 constitute a battery module.

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

Optionally, a module bottom plate 211 is disposed below at least some of the single batteries, 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 at least a portion of the unit batteries 100 constitute the battery module.

Optionally, a module top plate 212 is disposed above at least a portion of the single batteries 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 batteries 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, which faces 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, which faces 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 some of the unit cells 100 constitute the battery module.

Optionally, the number of the battery modules is at least two in a second direction a2 different from the first direction a 1.

Optionally, the power battery pack is provided with a plurality of layers of battery modules arranged along a third direction a 3.

Optionally, the single cell 100 is a square cell with a cuboid structure, and has a length L, a thickness D and a height H between the length L and the thickness D, each of the single cells 100 is placed on its side, each of the single cells 100 has a length direction of the first direction a1, a thickness direction of the second direction a2 and a height direction of the third direction A3, and two adjacent single cells 100 are arranged in a large-surface-to-large-surface manner.

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 batteries 100 is supported at the first support step 213, and the second end of each of the unit batteries 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 of the unit batteries 100 is fixed to the first fixing portion 215, and the second end of each of the unit batteries 100 is fixed to the second fixing portion 216.

Optionally, a first end plate 207 is disposed between the first ends of the plurality of unit batteries 100 and the first frame 201, a second end plate 208 is disposed between the second ends of the plurality of unit batteries 100 and the second frame, a module bottom plate 211 is disposed below the plurality of unit batteries 100, a module top plate 212 is disposed above the plurality of unit batteries 100, the receiving device 200 is oppositely provided with a third rim 203 and a fourth rim 204 along a second direction a2 different from the first direction a1, a first side plate 209 is arranged between the single battery 100 adjacent to the third frame 203 and the third frame 203, a second side plate 210 is disposed between the unit cell 100 adjacent to the fourth frame 204 and the fourth frame 204, 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 batteries 100 form a battery module.

Optionally, the ratio of the length L and the thickness D of the single battery 100 satisfies 50 ≦ L/D ≦ 70.

Optionally, the ratio of the surface area S to the volume V of the single battery 100 satisfies 0.15 ≦ S/V ≦ 0.2.

Optionally, the ratio of the surface area S of the single battery 100 to the energy E satisfies 250 ≦ S/E ≦ 400.

Optionally, the single battery 100 is a metal-case prismatic battery.

Optionally, a heat insulation layer 217 is disposed between the module base plate 211 and the single 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.

Optionally, the first electrode 101 of the single battery 100 is led out from the single battery 100 toward the first end of the first frame 201, and the second electrode 102 of the single battery 100 is led out from the single battery 100 toward the second end of the second frame 202.

Optionally, an explosion-proof valve 103 is disposed at the first end of the single battery 100 facing the first frame 201, an exhaust channel 222 is disposed inside the first frame 201, an air inlet 221 is disposed at a position on the first frame 201 corresponding to the explosion-proof valve 103 of each single battery 100, the air inlet 221 is communicated with the exhaust channel 222, and an exhaust hole communicated with the exhaust channel 222 is disposed on the accommodating device 200; and/or the single battery 100 is provided with an explosion-proof valve 103 towards the second end of the second frame 202, an exhaust channel 222 is provided inside the second frame 202, a 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.

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.

According to another aspect of the present disclosure, an electric vehicle is provided, which includes the power battery pack.

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

Optionally, the electric vehicle includes a power battery pack disposed at a bottom of the electric vehicle, the accommodating device 200 is fixedly connected to a chassis of the electric vehicle, the first direction a1 is a vehicle width direction of the electric vehicle, and the second direction a2 is a vehicle length direction of the electric vehicle.

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%.

Optionally, 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%.

According to still another aspect of the present disclosure, an energy storage device is provided, and the energy storage device includes the power battery pack.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A power battery pack, characterized in that the power battery pack is used for an electric vehicle, the width of the body of the electric vehicle is W, the power battery pack comprises a containing device (200) and a plurality of single batteries (100) arranged in the containing device (200), the containing device (200) comprises a first frame (201) and a second frame (202) which are oppositely arranged along a first direction (A1), the plurality of single batteries (100) are arranged between the first frame (201) and the second frame (202), the length of the single batteries (100) along the first direction (A1) is L1, the distance between the inner surface of the first frame (201) and the inner surface of the second frame (202) along the first direction (A1) is L2, the width L3 of the containing device (200) along the first direction (A1) meets L1/L2 being more than or equal to 50%, L1/W is more than or equal to 40% and less than or equal to 70%, and L3/W is more than or equal to 50% and less than or equal to 80%.

2. The power battery pack according to claim 1, wherein a first end of each of the battery cells (100) is supported by the first frame (201), and a second end of each of the battery cells (100) is supported by the second frame (202).

3. The power battery pack as claimed in claim 1, wherein the ratio L1/L2 is 80% or more and 97% or less.

4. The power battery pack of claim 1, wherein the receptacle (200) is a vehicle tray.

5. The power battery pack according to claim 4, wherein the length of the unit battery (100) in the first direction (A1) is 500-1000 mm.

6. The power battery pack of claim 1, wherein the receptacle (200) is formed on an electric vehicle.

7. The power battery pack of claim 6, wherein the receiving means (200) is a cavity (300) that is downwardly concave.

8. The power battery pack of claim 7, wherein the cavity (300) comprises a first side wall (301) and a second side wall (302) opposite to each other, the first rim (201) being an extension of the first side wall (301) and the first side wall (301) of the cavity (300), and the second rim (202) being an extension of the second side wall (302) and the second side wall (302) of the cavity (300).

9. The power battery pack of claim 8, wherein the extension of the first sidewall (301) and the extension of the second sidewall (302) form a bottom (305) of the cavity (300).

10. The power battery pack of claim 1, wherein the battery cells (100) are perpendicular to the first and second side frames (201, 202), and a length of the battery cells (100) in the first direction (A1) is a distance between first and second ends of the battery cells.

11. The power battery pack according to any one of claims 1-10, wherein a plurality of the unit cells (100) are arranged along a second direction (a2) different from the first direction (a 1).

12. The power battery pack according to claim 11, wherein the power battery pack is provided with a plurality of layers of the plurality of unit batteries (100) arranged along a 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).

13. The power battery pack according to any one of claims 1-10, wherein each of the unit batteries (100) is arranged with the first direction (a1) as a length direction.

14. The power battery pack according to any one of claims 1 or 3-10, wherein the receiving device (200) comprises a third frame (203) and a fourth frame (204) oppositely arranged along a second direction (a2) different from the first direction (a1), and the plurality of single cells (100) are arranged between the third frame (203) and the fourth frame (204) along the second direction (a 2).

15. The power battery pack of claim 14, wherein the third rim (203) applies a force toward the fourth rim (204) to the battery cells (100) disposed adjacent to the third rim (203), and the fourth rim (204) applies a force toward the third rim (203) to the battery cells (100) disposed adjacent to the fourth rim (204).

16. The power battery pack according to claim 15, wherein a first elastic buffer plate (205) is arranged between the third frame (203) and the single battery (100) adjacent to the third frame (203), and/or a second elastic buffer plate (206) is arranged between the fourth frame (204) and the single battery (100) adjacent to the fourth frame (204).

17. The power battery pack according to claim 2, wherein the first end of each of the battery cells (100) is fixed to the first rim (201) and the second end is fixed to the second rim (202).

18. The power battery pack according to claim 1, wherein a first end plate (207) is arranged between the first end of at least some of the plurality of single batteries (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 in the plurality of single batteries (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 single batteries (100) form a battery module.

19. The power battery pack according to claim 1, wherein a module bottom plate (211) is disposed below at least some of the single batteries (100) in the plurality of single batteries (100), and the at least some of the single batteries (100) are supported on the first frame (201) and the second frame (202) through the module bottom plate (211); the module bottom plate (211) and at least part of the single batteries (100) form a battery module.

20. The power battery pack of claim 18, wherein a module bottom plate (211) is arranged below at least some of the single batteries, the module bottom plate (211) is connected with the first end plate (207), and the module bottom plate (211) is connected with the second end plate (208); the module bottom 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.

21. The power battery pack according to claim 20, wherein a module top plate (212) is arranged above at least some of the single batteries (100), the module top plate (212) is connected with the first end plate (207), and the module top plate (212) is connected with the second end plate (208); the battery module is composed of the module top plate (212), the module bottom plate (211), the first end plate (207), the second end plate (208) and at least part of the single batteries (100).

22. The power battery pack according to claim 21, wherein 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 cell (100) constitute the battery module.

23. The power battery pack of any one of claims 18-22, wherein the number of battery modules is at least two in a second direction (a2) different from the first direction (a 1).

24. The power battery pack according to any one of claims 18-22, wherein the power battery pack is arranged with a plurality of layers of the battery modules in a third direction (a 3).

25. The power battery pack according to claim 11, wherein the unit cells (100) are rectangular cells having 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 disposed on its side, the length direction of each unit cell (100) is the first direction (a1), the thickness direction is the second direction (a2), and the height direction is the third direction (A3), and two adjacent unit cells (100) are arranged in a large-to-large manner.

26. The power battery pack of claim 2, wherein the first rim (201) is provided with a first support step (213) and the second rim (202) is provided with a second support step (214); the first end of each of the unit batteries (100) is supported at the first support step (213), and the second end of each of the unit batteries (100) is supported at the second support step (214).

27. The power battery pack according to claim 26, wherein 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 of the unit batteries (100) is fixed to the first fixing portion (215), and the second end of each of the unit batteries (100) is fixed to the second fixing portion (216).

28. The power battery pack according to any one of claims 1 to 10, wherein a first end plate (207) is disposed between a first end of the plurality of unit batteries (100) and the first frame (201), a second end plate (208) is disposed between a second end of the plurality of unit batteries (100) and the second frame, a module bottom plate (211) is disposed below the plurality of unit batteries (100), a module top plate (212) is disposed above the plurality of unit batteries (100), the accommodating device (200) is 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 between the unit batteries (100) adjacent to the third frame (203) and the third frame (203), and a second side plate (210) is disposed between the unit batteries (100) adjacent to the fourth frame (204) and the fourth frame (204) ) The battery module comprises a first end plate (207), a second end plate (208), a first side plate (209), a second side plate (210), a module top plate (212), a module bottom plate (211) and a plurality of single batteries (100).

29. The power battery pack according to claim 25, wherein the ratio of the length L and the thickness D of the single battery (100) satisfies 50 ≦ L/D ≦ 70.

30. The power battery pack according to claim 25, wherein the ratio of the surface area S to the volume V of the single battery (100) satisfies 0.15 ≦ S/V ≦ 0.2.

31. The power battery pack according to claim 25, wherein the ratio of the surface area S to the energy E of the single battery (100) satisfies 250 ≦ S/E ≦ 400.

32. The power battery pack according to any one of claims 1-10, wherein the battery cells (100) are metal-can prismatic cells.

33. The power battery pack according to any one of claims 19-22, wherein a thermal insulation layer (217) is arranged between the module base plate (211) and the single battery (100).

34. The power battery pack of claim 21 or 22, wherein a heat conducting plate (218) is arranged between the module top plate (212) and the single battery (100).

35. The power battery pack of claim 34, wherein the module top plate (212) is a liquid-cooled plate (219) or a straight-cooled plate (220) with a cooling structure disposed inside.

36. The power battery pack according to any one of claims 1-10, wherein the first electrode (101) of the single battery (100) is led out from the single battery (100) towards a first end of the first frame (201), and the second electrode (102) of the single battery (100) is led out from the single battery (100) towards a second end of the second frame (202).

37. The power battery pack according to any one of claims 1-10, wherein an explosion-proof valve (103) is arranged at a first end of the single battery (100) facing the first frame (201), an exhaust channel (222) is arranged inside the first frame (201), an air inlet (221) is arranged at a position, corresponding to the explosion-proof valve (103) at the first end of each single battery (100), on the first frame (201), the air inlet (221) of the first frame is communicated with the exhaust channel (222) of the first frame, and an exhaust hole communicated with the exhaust channel (222) of the first frame is arranged on the accommodating device (200); and/or the single battery (100) faces the second end of the second frame (202) and is provided with an explosion-proof valve (103), an exhaust channel (222) is arranged inside the second frame (202), the position, corresponding to the explosion-proof valve (103) at the second end of each single battery (100), on the second frame (202) is provided with an air inlet (221), the air inlet (221) of the second frame is communicated with the exhaust channel (222) of the second frame, and an exhaust hole communicated with the exhaust channel (222) of the second frame is formed in the accommodating device (200).

38. The power battery pack according to claim 11, 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.

39. An electric vehicle comprising the power battery pack of any one of claims 1-38.

40. The electric vehicle of claim 39, wherein the power battery pack is disposed at the bottom of the electric vehicle, and the accommodating device (200) is fixedly connected with a chassis of the electric vehicle.

41. The electric vehicle according to claim 39 or 40, wherein the electric vehicle comprises a power battery pack disposed at the 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 body width direction of the electric vehicle, and the second direction (A2) different from the first direction (A1) is a body length direction of the electric vehicle.

42. An energy storage device, characterized in that the energy storage device comprises a power battery pack according to any one of claims 1-38.