CN111224039B

CN111224039B - Casing, group battery and device

Info

Publication number: CN111224039B
Application number: CN202010321741.5A
Authority: CN
Inventors: 张凡; 戴晓汕
Original assignee: Jiangsu Contemporary Amperex Technology Ltd
Current assignee: Jiangsu Contemporary Amperex Technology Ltd
Priority date: 2020-04-22
Filing date: 2020-04-22
Publication date: 2020-07-24
Anticipated expiration: 2040-04-22
Also published as: CN111224039A

Abstract

The embodiment of the invention provides a shell, a battery pack and a device, wherein the shell comprises: an upper box body; the lower box body is used for being connected with the upper box body, the lower box body comprises a frame and a cross beam, the cross beam is located inside the frame, the cross beam and the frame are used for enclosing and forming an accommodating space for accommodating the battery modules, and the cross beam protrudes out of the frame in the direction of the upper box body of the lower box body. According to the embodiment of the invention, the cross beam of the shell is arranged to protrude out of the side frame, namely the cross beam is higher, and the higher cross beam can increase the structural rigidity of the shell in the height direction, inhibit the cross beam from bending and deforming, and prevent the shell from deforming.

Description

Casing, group battery and device

Technical Field

The invention relates to the technical field of energy storage equipment, in particular to a shell, a battery pack and a device.

Background

The battery pack as a vehicle-mounted energy storage device has severe working conditions and complex movement conditions, and when structural members of the battery pack fail, problems such as short circuit and fire are easily caused, so that the battery pack is required to have high structural strength and high vibration impact resistance, and internal structural members of the battery pack must be firmly fixed.

Therefore, a housing, a battery pack and a device are needed.

Disclosure of Invention

The embodiment of the invention provides a shell, a battery pack and a device, aiming at improving the structural strength of the shell of the battery pack.

An aspect of an embodiment of the present invention provides a case for a battery pack, the case including: an upper box body; the lower box body is used for being connected with the upper box body, the lower box body comprises a frame and a cross beam, the cross beam is located inside the frame, the cross beam and the frame are used for enclosing and forming an accommodating space for accommodating the battery modules, and the cross beam protrudes out of the frame in the direction of the upper box body of the lower box body.

According to one aspect of the invention, the cross beam comprises a body part and a reinforcing part, the reinforcing part is arranged on one side of the body part facing the upper box body, the reinforcing part protrudes out of the frame in the direction from the lower box body to the upper box body, and the width of the body part is larger than that of the reinforcing part in the width direction of the shell, so that the battery module in the accommodating space is abutted against the body part.

According to one aspect of the invention, the upper box comprises a top wall provided with a connection portion projecting towards the lower box, the connection portion being connected to the cross beam.

According to one aspect of the invention, the upper box body further comprises a side wall connected to the top wall, and the side wall extends from the top wall to the lower box body;

the top wall further includes a stepped portion connected to the side wall and/or the connection portion, the stepped portion being used to provide a restraining force to the battery module located in the receiving space.

According to an aspect of the present invention, the top wall further includes a covering portion covering the battery module, the covering portion being located between the adjacent two step portions;

the accommodating space is used for accommodating more than two battery modules which are arranged side by side along the width direction of the shell, the covering part protrudes towards the lower box body to form a pressing part, and the pressing part is used for providing limiting force for the two adjacent battery modules in the accommodating space.

According to one aspect of the invention, the battery module storage box further comprises a bottom plate, the bottom plate is positioned on one side of the lower box body, which is far away from the upper box body, and the inner surface of the bottom plate, which faces the accommodating space, is provided with a supporting plate, and the supporting plate is used for providing supporting force for two adjacent groups of battery modules positioned in the accommodating space.

According to one aspect of the invention, the lower box body further comprises a bearing plate, the bearing plate is arranged on the side frame and/or the cross beam, the bearing plate is formed by extending the side frame and/or the cross beam towards the accommodating space, and the bearing plate is used for bearing the battery modules in the accommodating space.

According to one aspect of the invention, the bezel comprises:

a boss; and

heavy platform is located the boss towards accommodation space's one side, and heavy platform is followed the sunken shaping of direction of keeping away from last box by the frame, and heavy platform is used for leaning on the battery module in the accommodation space. .

On the other hand, an embodiment of the present invention further provides a battery pack, including: the above-mentioned housing; the battery pack comprises a plurality of battery units, wherein the battery units are arranged in an accommodating space side by side.

In another aspect, an embodiment of the present invention further provides an apparatus using a battery pack as a power source, where the battery pack includes the above-mentioned housing.

In the case of the embodiment of the present invention, the case includes an upper case and a lower case. The lower box body comprises a frame and a beam located in the frame, and the frame and the beam enclose and form an accommodating space for accommodating the battery module. The crossbeam protrusion is higher in the frame setting, and the crossbeam is higher can increase the structural rigidity of casing in the direction of height, and the deflection deformation takes place for the suppression crossbeam, and then prevents that the casing from taking place to warp. The cross beam is heightened, the width of the cross beam can be reduced while the structural rigidity is ensured, the size of the accommodating space is increased, and when the shell is used for the battery pack, the energy density of the shell can be improved.

Drawings

Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings in which like or similar reference characters refer to the same or similar parts.

FIG. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a battery pack according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the exploded structure of FIG. 2;

fig. 4 is a partial sectional view of a battery pack according to an embodiment of the present invention;

FIG. 5 is a schematic view of a portion of the enlarged structure at I in FIG. 4;

fig. 6 is a schematic structural diagram of a battery module according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a lower box of a housing according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of an upper box of a housing according to an embodiment of the present invention;

fig. 9 is a partial structural schematic view of a battery pack according to another embodiment of the present invention;

FIG. 10 is a schematic illustration of the exploded structure of FIG. 9;

fig. 11 is a schematic structural view of a battery module according to another embodiment of the present invention;

fig. 12 is a partial sectional view of a battery pack according to another embodiment of the present invention;

FIG. 13 is an enlarged partial view of FIG. 12 at II;

fig. 14 is a partially enlarged schematic view of fig. 12 at III.

Description of reference numerals:

1. a battery pack; 2. a vehicle main body;

10. a housing; 20. a battery module; 21. a battery cell;

100. an upper box body; 110. a top wall; 111. a connecting portion; 112. a covering section; 112a, a pressing part; 113. a step portion; 113a, a first plate body; 113b, a second plate body; 120. a side wall; 121. a first side wall; 122. an explosion-proof valve; 130. a first elastic pad; 140. a second elastic pad;

200. a lower box body; 210. a frame; 211. a boss; 212. sinking a platform; 220. a cross beam; 221. a body portion; 222. a reinforcing portion; 230. an accommodating space; 240. a thermally conductive pad; 250. A carrier plate; 260. a device accommodating frame;

300. a base plate; 310. a support plate;

x, width direction;

y, the length direction;

z, height direction.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated for convenience in describing the invention and to simplify description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The directional terms appearing in the following description are intended to be illustrative in all directions, and are not intended to limit the specific construction of embodiments of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

For better understanding of the present invention, the housing, the battery pack 1 and the device according to the embodiment of the present invention will be described in detail below with reference to fig. 1 to 14.

As shown in fig. 1, the embodiment of the invention first provides a vehicle including a vehicle main body 2 and a battery pack 1, the battery pack 1 being provided to the vehicle main body 2.

Wherein, the vehicle is new energy automobile, and it can be pure electric automobile, also can hybrid vehicle or increase form car. The vehicle main body 2 is provided with a driving motor, the driving motor is electrically connected with the battery pack 1, the battery pack 1 provides electric energy, and the driving motor is connected with wheels on the vehicle main body 2 through a transmission mechanism so as to drive the automobile to move forward. Preferably, the battery pack 1 may be horizontally disposed at the bottom of the vehicle body 2.

It is understood that the battery pack 1 may be applied not only to vehicles but also to other devices. The embodiment of the invention also provides a device using the battery pack 1 as a power supply, and the device can be, but is not limited to, a vehicle, a ship, an aircraft or the like.

There are various arrangement manners of the battery pack 1, in some alternative embodiments, please refer to fig. 2 and fig. 3 together, fig. 2 is a schematic structural diagram of the battery pack 1 according to an embodiment of the present invention, and fig. 3 is a schematic structural diagram of fig. 2 in an exploded manner. In some alternative embodiments, the battery pack 1 includes a case 10 and a battery module 20 disposed in the case 10.

The number of the battery modules 20 is one or more, and when the battery modules 20 are plural, the plural battery modules 20 are arranged in the housing 10.

The type of the case 10 is not limited, and the case 10 may be a frame-shaped case 10, a disc-shaped case 10, or a box-shaped case 10, etc., and specifically, the case 10 may include a lower case 200 for accommodating the battery module 20 and an upper case 100 covering the lower case 200.

In some alternative embodiments, referring to fig. 4, fig. 4 is a partial cross-sectional view of a battery pack 1 according to an embodiment of the invention.

In some alternative embodiments, the housing 10 comprises: an upper case 100; the lower case 200 is used for being connected with the upper case 100, the lower case 200 includes a frame 210 and a beam 220, the beam 220 is located inside the frame 210, the beam 220 and the frame 210 are used for enclosing to form more than two accommodating spaces 230 for accommodating the battery modules 20, and the beam 220 protrudes out of the frame 210 in the direction from the lower case 200 to the upper case 100.

The frame 210 according to the embodiment of the present invention is a part of the lower case 200 for enclosing the accommodating space 230. In some optional embodiments, the lower case 200 further includes a device receiving frame 260 disposed outside the frame 210 for receiving other components.

In the case 10 of the embodiment of the present invention, the case 10 includes an upper case 100 and a lower case 200. The lower case 200 includes a frame 210 and a beam 220 positioned in the frame 210, and the frame 210 and the beam 220 enclose a receiving space 230 for receiving the battery module 20.

The cross beam 220 of the housing 10 serves as a bearing structure, two ends of the cross beam 220 are fixed to the frame 210, and the middle portion of the cross beam 220 is pressed, so that the cross beam 220 is easily deflected in the vertical direction, and the structural damage is caused even if the stress is too large. The cross beam 220 of the embodiment of the present invention protrudes from the frame 210, that is, the cross beam 220 is higher, which can increase the structural rigidity of the housing 10 in the height direction (Z direction in fig. 2), and inhibit the cross beam 220 from bending and deforming, thereby preventing the housing 10 from deforming. The height of the cross beam 220 is increased, so that the width of the cross beam 220 can be reduced while the structural rigidity is ensured, the size of the accommodating space 230 is increased, and the energy density of the housing 10 can be improved.

In addition, by providing the cross member 220, the size of communication between two adjacent accommodating spaces 230 can be reduced, and the mutual influence generated when the battery modules 20 in the two adjacent accommodating spaces 230 operate can be weakened. When the operation of the battery module 20 in one of the receiving spaces 230 is abnormal and a large amount of hot air is generated, the heightened cross member 220 can reduce the influence of the hot air in the receiving space 230 on the normal operation of the battery module 20 in the other receiving space 230.

The arrangement of the beam 220 is various, and in some alternative embodiments, the beam 220 is arranged with the same width along the height direction Z, that is, the cross-sectional area of the beam 220 along the width direction (X direction in fig. 2) is the same everywhere.

In other alternative embodiments, the cross beam 220 includes a main body 221 and a reinforcing portion 222, the reinforcing portion 222 is disposed on a side of the main body 221 facing the upper case 100, the reinforcing portion 222 is disposed to protrude from the bezel 210, and in the width direction X of the housing 10, the width of the main body 221 is greater than the width of the reinforcing portion 222, so that the battery module 20 located in the accommodating space 230 abuts against the main body 221.

In these alternative embodiments, the cross beam 220 is disposed in a manner that the width of the bottom is wider than the width of the reinforcing portion 222, that is, the width of the body portion 221 is greater than the width of the reinforcing portion 222, so that the battery module 20 abuts against the body portion 221, the contact area between the battery module 20 and the body portion 221 can be reduced, the possibility of generating a gap between the battery module 20 and the body portion 221 due to manufacturing tolerance is reduced, the limiting force applied by the body portion 221 to the battery module 20 is increased, and the contact between the cross beam 220 and the battery module 20 is tighter. In addition, the reinforcing part 222 has a small width, so that a predetermined distance can be formed between the battery module 20 and the reinforcing part 222, and the predetermined distance can provide a relief for the expansion of the battery cells 21 when the battery module 20 is used for a long time or the expansion is generated due to a large number of charging and discharging times.

In some alternative implementations, the reinforcing portion 222 and the body portion 221 are integrally provided, which can improve the connection strength between the reinforcing portion 222 and the body portion 221.

In some alternative implementations, the reinforcement 222 is a solid beam.

In other alternative embodiments, the reinforcing part 222 is a hollow beam, and the reinforcing part 222 is formed by enclosing a plate-shaped structural body, so that the weight of the reinforcing part 222 can be reduced, and the energy density of the battery pack 1 can be improved.

In some alternative embodiments, the body portion 221 is a solid beam.

In other alternative embodiments, the body portion 221 is a hollow beam, and the body portion 221 is formed by enclosing a plate-shaped structural body, so that the weight of the body portion 221 can be reduced, and the energy density of the battery pack 1 can be improved. In some alternative embodiments, the body portion 221 and the reinforcement portion 222 are integrally formed by a casting process.

The extension of the main body 221 in the height direction Z is not limited, and in some alternative embodiments, the extension of the main body 221 in the height direction Z is equal to the extension of the bezel 210 in the height direction Z. In other alternative embodiments, the extension dimension of the body part 221 in the height direction Z is one fifth to one third of the extension dimension of the battery cell 21 in the height direction Z, i.e., the ratio of the height H1 of the body part 221 to the height H2 of the battery cell 21 is 1:5 to 1: 3. The height H1 of the main body 221 and the height H2 of the battery cell 21 are within the above range, which not only ensures that the main body 221 has sufficient structural strength, but also avoids the contact area between the battery cell 21 and the main body 221 from being too large due to the too high main body 221.

The upper case 100 may be disposed in various manners, and in some alternative embodiments, as shown in fig. 3 and 4, the upper case 100 may include a top wall 110, the top wall 110 may protrude toward the lower case 200 to form a connection portion 111, and the connection portion 111 may be connected to the cross member 220.

In these alternative embodiments, the top wall 110 is provided with the connecting portion 111, and the connecting portion 111 is connected to the cross member 220, so that not only the connection strength between the upper case 100 and the lower case 200 can be improved, but also the restraining force of the upper case 100 on the battery module 20 can be improved, and the stability of the relative position between the battery module 20 and the housing 10 can be improved.

After the connecting parts 111 and the cross beams 220 are connected, the adjacent accommodating spaces 230 are separated from each other by the connecting parts 111 and the cross beams 220, and when the battery modules 20 in one of the accommodating spaces 230 abnormally operate and generate hot air, the influence of the hot air injected into the other accommodating spaces 230 on the normal operation of the other battery modules 20 can be reduced, and the safety performance of the battery pack 1 can be improved.

In addition, since the cross beam 220 is high, the connection portion 111 may be set to be short, that is, the extension distance of the connection portion 111 in the height direction Z is short, so that the upper case 100 is conveniently formed, and meanwhile, the upper case 100 can be ensured to have sufficient structural strength, and the upper case 100 is prevented from being deformed.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a battery module 20 according to an embodiment of the present invention, in some alternative embodiments, the battery module 20 includes a plurality of battery cells 21 arranged side by side along a length direction (Y direction in fig. 2). In some alternative embodiments, the outer circumference of the plurality of battery cells 21 is wrapped with a band or the like to form the battery module 20. A set of battery modules 20 may be disposed in the accommodating space 230, or a plurality of sets of battery modules 20 disposed side by side in the width direction X may be disposed in the accommodating space 230. Among them, the accommodating space 230 is provided with a set of battery modules 20 in the embodiment shown in fig. 2 to 4.

In some alternative embodiments, the surface-to-surface contact between the connecting portion 111 and the cross member 220 can increase the contact area between the connecting portion 111 and the cross member 220, and ensure the stability of the relative position between the two. In some alternative embodiments, the extension of the connecting portion 111 in the width direction X is greater than or equal to the extension of the upper end surface of the cross beam 220 in the width direction X, so that the upper end surface of the cross beam 220 can be attached to the connecting portion 111, and the contact area between the cross beam 220 and the connecting portion 111 is further increased. When the cross member 220 includes the body portion 221 and the reinforcing portion 222, the reinforcing portion 222 and the connecting portion 111 are connected to each other. In some alternative embodiments, the extension of the connecting portion 111 in the width direction X is greater than or equal to the extension of the reinforcing portion 222 in the width direction X.

In some alternative implementations, referring to fig. 7, fig. 7 is a schematic structural diagram of a lower case 200 according to an embodiment of the present invention. As shown in fig. 7, the cross member 220 is provided with a loading plate 250, and the loading plate 250 is formed to extend toward the receiving space 230 such that the loading plate 250 can load the battery module 20 located in the receiving space 230. In some alternative embodiments, when the cross member 220 includes the body portion 221, the loading plate 250 is extended and molded by the body portion 221 toward the receiving space 230. The carrier plate 250 can not only improve the structural strength of the case 10, but also provide support to the battery module 20, prevent the deformation of the lower case 200 due to the overweight of the battery module 20, and ensure the stability of the relative position between the battery module 20 and the case 10.

In some alternative embodiments, as shown in fig. 7, the frame 210 includes a boss 211 and a sinking platform 212, the sinking platform 212 is located on a side of the boss 211 facing the accommodating space 230, and the sinking platform 212 is formed by the frame 210 in a concave manner in a direction away from the upper case 100, so that the battery module 20 located in the accommodating space 230 can abut against the sinking platform 212.

In these alternative implementations, the side of the frame 210 facing the receiving space 230 is recessed to form the sinking platform 212, and the battery module 20 located in the receiving space 230 abuts against the sinking platform 212, so that the contact area between the battery module 20 and the frame 210 can be reduced, the possibility of a gap between the battery module 20 and the sinking platform 212 due to manufacturing tolerance can be reduced, and the contact between the battery module 20 and the frame 210 can be more tight.

The extension of the platform 212 in the height direction is not limited, and in some alternative embodiments, the extension of the platform 212 in the height direction Z is smaller than the extension of the body portion 221 of the beam 220 in the height direction Z. Or the extension of the sinking platform 212 in the height direction Z is equal to the extension of the body part 221 in the height direction Z.

The frame 210 is provided with a loading plate 250, and the loading plate 250 is formed by extending the frame 210 toward the accommodating space 230, so that the loading plate 250 can load the battery module 20 located in the accommodating space 230. When the bezel 210 includes the sinking platform 212, the carrier plate 250 is extended from the sinking platform 212 toward the accommodating space 230.

In some preferred embodiments, as shown in fig. 4-7, the cross beam 220 and the bezel 210 are provided with a bearing plate 250. When the heat conduction pad 240 is disposed between the battery module 20 and the lower case 200, the heat conduction pad 240 is located between the adjacent carrier plates 250, and the carrier plates 250 provide bearing force to the battery module 20, so that the acting force applied by the battery module 20 to the heat conduction pad 240 can be reduced, and the heat conduction pad 240 is prevented from being damaged by pressure and affecting the service life of the heat conduction pad 240.

In some optional embodiments, a screw hole is further provided on the frame 210, and when the frame 210 includes the boss 211, a screw hole is provided on the boss 211, so that the upper case 100 can be connected to the lower case 200 by a bolt.

As shown in fig. 3 to 5, in some alternative embodiments, the upper box 100 further includes a sidewall 120 connected to the top wall 110, and the sidewall 120 is formed by extending the top wall 110 toward the lower box 200. In some alternative embodiments, the top wall 110 is further provided with a step part 113, and the step part 113 is connected to the side wall 120 and/or the connection part 111 to provide a restraining force to the battery module 20 located in the receiving space 230 through the step part 113.

In these alternative implementations, the step part 113 is disposed on the top wall 110, the step part 113 is connected to the side wall 120 and/or the connecting part 111, and the step part 113 can provide a limiting force to the battery module 20 in two directions, so as to ensure the stability of the relative position between the battery module 20 and the housing 10.

In some optional embodiments, the sidewall 120 further comprises a first sidewall 121, and the first sidewall 121 is provided with an explosion-proof valve 122. In some alternative embodiments, the first sidewall 121 is provided with an explosion-proof valve 122 corresponding to each accommodation space 230. In some alternative embodiments, the first sidewall 121 is located on one side of the battery module 20 in the length direction Y, that is, the first sidewall 121 is located on one side of the battery modules 20 where the battery cells 21 are arranged side by side.

As shown in fig. 3 to 8, in some alternative embodiments, the top wall 110 further includes a cover portion 112, and the cover portion 112 is located between the adjacent step portions 113 to cover the battery modules 20 in the receiving space 230. In order to give way to the harness or the like on the top of the battery module 20, the cover 112 is formed by the step 113 protruding in a direction away from the lower case 200 to form a giving way gap between the cover 112 and the battery module 20.

The step 113 may be disposed in various ways, and in some alternative embodiments, the step 113 includes a first plate 113a and a second plate 113 b. The first plate 113a is formed by extending in a direction away from the covering part 112, so that the first plate 113a and the top of the battery module 20 are abutted against each other, and the first plate 113a provides a limiting force to the battery module 20 toward the lower case 200; the second plate 113b is formed by extending the first plate 113a in a direction toward the lower case 200 such that the second plate 113b abuts against the side of the battery module 20, and the second plate 113b provides a restraining force in the width direction X to the battery module 20.

In some optional embodiments, a first elastic pad 130 is disposed between the step portion 113 and the battery module 20, and the first elastic pad 130 may be a foam pad, or the like, so as to prevent the step portion 113 and the battery cells 21 from colliding with each other and affecting the service life of the housing 10 or the battery module 20.

In some alternative embodiments, the first elastic pad 130 and the first and

second plate bodies

113a and 113b are attached to each other such that the first and

second plate bodies

113a and 113b are abutted against each other by the first elastic pad 130 and the battery module 20.

Referring to fig. 9 to 14, fig. 9 to 13 are schematic structural views of a battery pack according to another embodiment of the present invention. Fig. 9 is a schematic view showing only a part of the structure of a battery pack according to another embodiment, and is different from the previous embodiment only in that two sets of battery modules 20 are disposed in the accommodating space 230.

In some alternative embodiments, when more than two sets of battery modules 20 are disposed side by side in the accommodating space 230, the covering portion 112 is further provided with a pressing portion 112a, the pressing portion 112a is formed by protruding the covering portion 112 toward the lower case 200, and the pressing portion 112a is disposed corresponding to two adjacent battery modules 20, so that the pressing portion 112a can provide a restraining force to two adjacent battery modules 20.

In some alternative embodiments, the pressing portion 112a is disposed corresponding to the adjacent position between two adjacent battery modules 20, and the pressing portion 112a presses two battery modules 20 downwards from the adjacent position, so that the two battery modules 20 can be prevented from being inclined in the direction toward the upper case 100.

In some alternative embodiments, a second elastic pad 140 is disposed between the pressing portion 112a and the battery module 20, and the pressing portion 112a and the battery module 20 abut against each other through the second elastic pad 140. So as to prevent the corners of the battery module 20 from scratching the pressing part 112a and prolong the service life of the housing 10.

The second elastic pad 140 may be a sponge pad, a foam pad, etc., as long as the second elastic pad 140 has certain elasticity. In some alternative embodiments, the second elastic pad 140 and the first elastic pad 130 are made of the same material.

In some alternative embodiments, the side of the lower case 200 facing away from the upper case 100 is further provided with a bottom plate 300, and the bottom plate 300 may be a liquid-cooled plate. In some alternative embodiments, when more than two rows of battery modules 20 are disposed in the accommodating space 230, the bottom plate 300 is further provided with a supporting plate 310, and the supporting plate 310 is correspondingly disposed between two adjacent battery modules 20, so that the supporting plate 310 can simultaneously provide a supporting force to the two adjacent battery modules 20, and the two adjacent battery modules 20 are prevented from being inclined and deformed in a direction away from the upper case 100 at the adjacent positions thereof.

In some alternative embodiments, the support plate 310 is disposed corresponding to the adjacent position between two adjacent battery modules 20, and the support plate 310 carries the two battery modules 20 upward from the adjacent position, so that the two battery modules 20 can be prevented from being inclined downward. Upward refers to a direction toward the upper case 100, and downward refers to a direction away from the upper case 100.

As shown in fig. 12 to 14, when more than two sets of battery modules 20 are disposed in the receiving space 230, it is preferable that the cover 112 is provided with the pressing portion 112a, the support plate 310 is disposed between the bottom plate 300 and the battery modules 20, and the support plate 310 and the cover 112 can prevent the adjacent two sets of battery modules 20 from tilting, thereby ensuring the stability of the relative position between the battery modules 20 and the housing 10.

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A battery pack, characterized in that the battery pack comprises a housing and a battery module, wherein the housing comprises an upper box body and a lower box body;

the upper box body comprises a top wall and a side wall connected to the top wall, the side wall extends and forms from the top wall to the lower box body, and the top wall is convexly provided with a connecting part towards the lower box body;

the lower box body is used for being connected with the upper box body and comprises a frame and a cross beam, the cross beam is located inside the frame, the cross beam and the frame are used for enclosing to form more than two containing spaces for containing the battery modules, the cross beam protrudes out of the frame in the direction from the lower box body to the upper box body, the battery modules protrude out of the cross beam, and the cross beam is connected to the connecting part;

wherein the top wall further includes a stepped part for providing a restraining force to the battery module located in the receiving space.

2. The battery pack according to claim 1, wherein the cross member includes a body portion and a reinforcing portion, the reinforcing portion is provided on a side of the body portion facing the upper case, the reinforcing portion protrudes from the rim in a direction from the lower case to the upper case, and a width of the body portion is larger than a width of the reinforcing portion in a width direction of the case, so that the battery module located in the accommodating space abuts against the body portion.

3. The battery pack according to claim 1, wherein the step part is connected to the side wall and/or the connection part.

4. The battery pack of claim 1, wherein the top wall further comprises a cover portion overlying the battery module, the cover portion being located between two adjacent step portions;

the accommodating space is used for accommodating more than two battery modules which are arranged side by side along the width direction of the shell, the covering part protrudes towards the lower box body to form a pressing part, and the pressing part is used for providing limiting force for two adjacent battery modules in the accommodating space.

5. The battery pack according to claim 4, wherein the housing further comprises a bottom plate located on a side of the lower case facing away from the upper case, and a support plate is provided on an inner surface of the bottom plate facing the accommodating space, the support plate being configured to provide a supporting force to two adjacent sets of the battery modules located in the accommodating space.

6. The battery pack according to any one of claims 1 to 5, wherein the lower case further comprises a bearing plate, the bearing plate is disposed on the side frame and/or the cross beam, and the bearing plate is formed by extending the side frame and/or the cross beam toward the receiving space, and the bearing plate is used for bearing the battery module in the receiving space.

7. The battery pack of any of claims 1-5, wherein the frame comprises:

a boss; and

heavy platform is located the boss orientation one side of accommodation space, heavy platform by the frame is along keeping away from go up the sunken shaping of direction of box, heavy platform is used for leaning on in the accommodation space battery module.

8. An apparatus using a battery pack as a power source, wherein the battery pack comprises the battery pack according to any one of claims 1 to 7.