CN113851770B

CN113851770B - Battery pack and electric vehicle

Info

Publication number: CN113851770B
Application number: CN202010515629.5A
Authority: CN
Inventors: 谭亮稳; 谭晶; 陈文会
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2023-07-14
Anticipated expiration: 2040-06-09
Also published as: CN113851770A

Abstract

The application discloses battery package and electric motor car, this battery package includes tray and samming board, the tray includes boundary beam and stiffening beam, stiffening beam sets up in the accommodation space that the boundary beam encloses and is connected with the boundary beam, stiffening beam has two relative first terminal surfaces in first direction, accommodation space has open-top; the temperature equalization board sets up accommodation space's open-top department, the temperature equalization board including facing accommodation space's internal surface with the surface that the internal surface is relative, just the temperature equalization board has two relative first edge in first direction, be provided with on the internal surface of first edge relatively the bellied spacing boss of internal surface, wherein be located first direction is with one side spacing boss with first terminal surface butt through above-mentioned mode, can improve the extrusion resistance of temperature equalization board, can prevent simultaneously that the temperature equalization board from producing the displacement.

Description

Battery pack and electric vehicle

Technical Field

The application relates to the field of batteries, in particular to a battery pack and an electric vehicle.

Background

The battery pack is used as a main power source of the new energy electric automobile, and the use performance and the safety performance of the electric automobile are directly affected by the quality of the battery pack. In the battery pack structure, a tray is generally used to load a power battery, and then the tray is sealed by a tray cover, thereby forming a battery pack, and then the battery pack is mounted on an electric vehicle.

The battery pack can have the problem of generating heat in the course of the work, consequently need dispel the heat to the battery pack to improve the battery life-span in the battery pack, common practice sets up samming board (i.e. heating panel or liquid cooling board) in the battery pack and goes out heat transfer, in order to realize the heat dissipation, samming board generally sets up at battery pack top or bottom, when the battery pack received extrusion collision, produced extrusion deformation and displacement change to samming board easily, influences the radiating effect.

Disclosure of Invention

The application aims at solving at least one of the technical problems existing in the prior art, and provides a battery pack which can improve the extrusion resistance of a temperature equalization plate and prevent the temperature equalization plate from generating displacement.

To this end, an aspect of the present application proposes a battery pack including:

the tray comprises edge beams and reinforcing beams, wherein the edge beams enclose an accommodating space of the tray, the reinforcing beams are arranged in the accommodating space and are connected with the edge beams, the lengths of the reinforcing beams extend along a first direction, the reinforcing beams are provided with two opposite first end surfaces in the first direction, and the accommodating space is provided with a top opening;

the temperature equalization plate is arranged at the top opening of the accommodating space, the temperature equalization plate comprises an inner surface facing the accommodating space and an outer surface opposite to the inner surface, the temperature equalization plate is provided with two opposite first edge parts in the first direction, and the inner surface of the first edge parts is provided with a limiting boss opposite to the inner surface, wherein the limiting boss is positioned on the same side in the first direction and is abutted to the first end face.

In the embodiment of the application, the limiting boss and the temperature equalizing plate are integrally formed.

In an embodiment of the present application, the width of the tray extends along the first direction, the length of the tray extends along the second direction, the thickness of the tray extends along the third direction, and the top opening of the accommodating space is located at one side of the tray in the third direction;

the boundary beams comprise two first boundary beams and two second boundary beams, the two first boundary beams are positioned on two opposite sides of the tray along the second direction, the two second boundary beams are positioned on two opposite sides of the tray along the first direction, and the stiffening beams are parallel to the first boundary beams.

In the embodiment of the application, the reinforcement beam has a second end face facing the inner surface of the temperature equalizing plate in the third direction, and the temperature equalizing plate is connected with the reinforcement beam and the connection part is located on the second end face of the reinforcement beam.

In an embodiment of the present application, the two first edge portions are respectively mounted on the two second edge beams;

and the inner surface of one of the second side beam and the first edge part facing the accommodating space is provided with a clamping groove, and the other one of the second side beam and the second edge part is inserted into the clamping groove.

In the embodiment of the application, the outer surface of the temperature equalizing plate is provided with a plurality of cooling pipelines which are sequentially arranged, and a heating element is arranged between two adjacent cooling pipelines;

the temperature equalization plate comprises a bearing area for placing the cooling pipeline and the heating piece and a connecting area except the bearing area, wherein the thickness of the connecting area is larger than that of the bearing area.

In an embodiment of the present application, the lengths of the cooling duct and the heating member extend along the second direction, and the plurality of cooling ducts are sequentially arranged along the first direction.

In the embodiment of the application, the heating piece is a heating film, and the temperature equalizing plate and the cooling pipeline are integrally extruded and molded;

the thickness of the cooling pipeline is larger than that of the heating piece;

in an embodiment of the present application, the battery pack further includes a plurality of unit batteries placed in the accommodating space, the plurality of unit batteries are sequentially arranged along the second direction, and the lengths of the unit batteries extend along the first direction;

the inner surface of the temperature equalizing plate is bonded with the single battery through heat conduction structural adhesive.

In another aspect of the present application, there is also provided an electric vehicle including the battery pack of any one of the above.

According to the battery pack disclosed by the embodiment of the application, the strength of the tray is improved by arranging the reinforcing beam in the accommodating space of the tray, wherein the reinforcing beam is provided with two opposite first end surfaces in the length direction, namely the first direction, the temperature equalizing plate is provided with two opposite first edge parts in the first direction, the inner surface of the first edge parts is provided with the limiting boss protruding relative to the inner surface on one side of the accommodating space, and the limiting boss and the first end surface on the same side in the first direction are abutted, so that the two limiting bosses are respectively abutted to the two first end surfaces of the reinforcing beam, and therefore, when the side edge of the temperature equalizing plate is extruded and collided by external acting force, partial stress can be transferred to the reinforcing beam, tangential displacement of the temperature equalizing plate 12 is prevented, and the extrusion resistance of the temperature equalizing plate can be improved.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, wherein:

fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present disclosure;

fig. 2 is a sectional view of the battery pack shown in fig. 1 along the AB direction;

FIG. 3 is an enlarged schematic view of FIG. 2 at the oval dashed line C;

fig. 4 is an exploded view of a battery pack according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a cooling pipe integrated on a temperature uniformity plate according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a cooling duct and a heating element integrated on a temperature equalization plate according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a tray according to an embodiment of the present application.

Reference numerals:

battery pack 100

11. A tray; 110. an accommodation space; 111. a first side rail; 112. a second side rail; 1121. a clamping groove; 1122. a vertical frame; 1123. a horizontal frame; 113. a stiffening beam; 1131. a first end face; 1132. a second end face; 114. lifting lugs; 12. a temperature equalizing plate; 121. a first edge portion; 122. a second edge portion; 123. a limit boss; 124. a connecting piece; 13. a single battery; 14. a cooling pipe; 15. a heating member; 161. a water inlet pipe; 162. a water outlet pipe; 163. a transfer pipe; 17. sealing cover; 171. 21, 26 bolts; 172. a through hole; 18. sealing foam; 20. a heat conducting structural adhesive; 22 bottom plate; 23 a protective plate; 24 and 25 of a thermally conductive structural adhesive.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The battery pack according to the embodiment of the present application will be described in detail with reference to fig. 1 to 7.

Referring to fig. 1-7, in the embodiment of the battery pack provided herein, a battery pack 100 is used to power an electric vehicle and includes a tray 11 and a temperature equalization plate 12. The tray 11 includes a side beam and a reinforcing beam 113, the side beam encloses an accommodating space 110 of the tray 11, and the reinforcing beam 113 is located in the accommodating space 110 and connected with the side beam. The accommodating space 110 is used for accommodating the unit cells 13, wherein the accommodating space 110 has a top opening. The temperature equalizing plate 12 is disposed at the top opening of the accommodating space 110, so that the temperature equalizing plate 12 can be covered at the top opening of the accommodating space 110. The battery pack 100 further includes a plurality of unit cells 13, and the plurality of unit cells 13 are disposed in the receiving space 110.

The length of the reinforcement beam 113 extends in a first direction, for example, the width direction of the tray 11, that is, the direction X shown in fig. 4. The reinforcement beam 113 has two first end faces 1131 opposite in the first direction X. The temperature equalizing plate 12 includes an inner surface facing the accommodating space 110 and an outer surface opposite to the inner surface, the temperature equalizing plate 12 has two opposite first edge portions 121 in the first direction, and the inner surface of the first edge portions 121, that is, a surface of the first edge portions 121 facing the accommodating space 110 is provided with a limit boss 123 protruding from the inner surface, wherein the limit boss 123 located on the same side in the first direction X abuts against the first end surface 1131. Therefore, the two limiting protrusions 123 are respectively abutted against the two first end faces 1131 of the reinforcement beam 113, so that when the side edges of the temperature equalization plate 12 are extruded and collided by external acting force, partial stress can be transferred to the reinforcement beam 113, tangential displacement of the temperature equalization plate 12 is prevented, and extrusion resistance of the temperature equalization plate 12 can be improved.

The limiting boss 123 and the temperature equalizing plate 12 may be integrally formed or may be separately formed, and when the temperature equalizing plate 12 is separately formed, the limiting boss 123 and the temperature equalizing plate 12 may be fixed by adhesion or screwing.

As shown in fig. 4, the battery pack 100 may further include a heat-conducting structural adhesive 20, where the heat-conducting structural adhesive 20 is connected between the inner surface of the temperature-equalizing plate 12 and the unit battery 13, so as to facilitate heat transfer from the unit battery 13 to the temperature-equalizing plate 12.

In this embodiment, the tray 11 is a substantially rectangular parallelepiped tray, the width of the tray 11 extends along the first direction X, the length direction of the tray 11 extends along the second direction Z, the thickness of the tray 11 extends along the third direction Y, and the top opening of the accommodating space 110 is located at one side of the tray 11 in the third direction Y, where the first direction X, the second direction Z and the third direction Y are perpendicular to each other.

Wherein, referring to fig. 4 and 7, the side beams of the tray 11 include two first side beams 111 and two second side beams 112, the two first side beams 111 are located at opposite sides of the tray 11 along the second direction Z, the two second side beams 112 are located at opposite sides of the tray 11 along the first direction X, and the first side beams 111 and the second side beams 112 are connected, thereby forming a square tray 11. The reinforcement beam 113 is disposed parallel to the first side beam 111. Further, the number of the reinforcing beams 113 may be two, one reinforcing beam 113 is disposed adjacent to one of the first side beams 111, the other reinforcing beam 113 is disposed adjacent to the other first side beam 111, and the strength of the tray 11 may be improved by the action of the reinforcing beams 113.

Wherein, the reinforcing beam has the second terminal surface 1132 facing the internal surface of the samming plate 12 on the third direction Y, samming plate 12 is connected with reinforcing beam 113 and the connection part is located at the second terminal surface 1132 of reinforcing beam 113, wherein, the samming plate 12 and the reinforcing beam 113 can be fixed by bolts 21, i.e. screw holes are arranged at the positions of samming plate 12 corresponding to the second terminal surface 1132 of reinforcing beam 113, corresponding screw holes are also arranged on the second terminal surface 1132 of reinforcing beam 113, thereby fixing the two by matching with bolts 21. Alternatively, in other embodiments, welding may be performed between the temperature equalization plate 12 and the reinforcement beam 113.

In the embodiment of the present application, the two first edge portions 121 of the temperature equalizing plate 12 are respectively mounted on the two second side beams 112. Specifically, a clamping groove 1121 is provided on an inner surface of the second side beam 112 facing the accommodating space 110, and the second edge portion 122 of the temperature equalizing plate 12 is inserted into the clamping groove 1121. The slot 1121 may be, for example, a right angle slot as shown, or may be a groove structure. Therefore, by arranging the clamping groove 1121, the edge of the temperature equalizing plate 12 is inserted into the clamping groove 1121, so that when the second side beam 112 is extruded and collided, the force can be transmitted to the temperature equalizing plate 12 through the second side beam 112, the extrusion resistance of the second side beam 112 is improved by using the temperature equalizing plate 12, and the probability of deformation of the second side beam 112 caused by extrusion is reduced.

Further, glue is used to bond the second edge 122 of the temperature equalizing plate 12 and the second side beam 112.

In addition, the length of the single battery 13 extends along the first direction X, the single battery 13 comprises a pole column for extracting current, the pole column is located at the end portion of the single battery 13 along the first direction X, the positive pole column and the negative pole column can be located at the same end portion of the single battery 13 along the first direction X, and can also be located at two opposite ends of the single battery 13 along the first direction X, namely, the pole column of the single battery 13 is arranged towards the second boundary beam 112, and the clamping groove 1121 is arranged on the second boundary beam 112 and is connected with the temperature equalizing plate 12, so that when the second boundary beam 112 is subjected to extrusion collision, collision force can be transmitted to the temperature equalizing plate 12, the collision force is transmitted to the shell of the single battery 13 through the heat conducting structural adhesive 20, the extrusion resistance of the second boundary beam 112 is improved, deformation of the second boundary beam 112 is avoided, the pole column of the single battery 13 is extruded, and short circuit among the single batteries 13 is prevented.

In other embodiments, a clamping groove may be formed on the second edge portion 122 of the temperature uniformity plate 12, and the top of the second side beam 112 is inserted into the clamping groove of the second edge portion 122, so that the collision force received by the second side beam 112 can be transferred to the temperature uniformity plate 12, so as to improve the anti-extrusion capability of the second side beam 112.

In the embodiment of the present application, referring to fig. 4, 5 and 6, a plurality of cooling pipes 14 are provided on the outer surface of the temperature equalizing plate 12 in order, and a heating member 15 is provided between two adjacent cooling pipes 14. Therefore, the heat dissipation of the battery pack 100 can be realized through the action of the cooling pipeline 14, and the battery pack 100 can be heated in a low-temperature environment through the action of the heating element 15, so that the performance and the service life of the single battery are ensured; in addition, in the embodiment of the application, the cooling pipeline 14 and the heating element 15 are integrated on the temperature equalizing plate 12, so that the space between the cooling pipeline 14 is fully utilized to set the heating element 15, the space occupied by the cooling pipeline 14 and the heating element 15 by the battery pack 100 can be reduced, and the space utilization rate of the battery pack 100 can be improved.

The heating element 15 may be a heating film, which may be fixed to the temperature equalization plate 12 by means of adhesion.

In some embodiments of the present application, the temperature equalizing plate 12 further includes two opposite second edge portions 122, where two first edge portions 121 of the temperature equalizing plate 12 are in one-to-one correspondence with two second edge beams 121 of the tray 11, and two second edge portions 122 are in one-to-one correspondence with two first edge beams 111 of the tray 11.

The cooling ducts 14 are elongated ducts, the length of the cooling ducts 14 extending in the direction from one of the second edge portions 122 to the other second edge portion 122, i.e. the cooling ducts 14 substantially cover the temperature equalizing plate 12 in the second direction Z.

Further, the width of the temperature equalizing plate 12 extends along a first direction, the first direction is the width direction of the tray 11, as shown in fig. 4, the first direction is the direction X, the length of the temperature equalizing plate 12 extends along a second direction, the second direction is the length direction of the tray 11, as shown in fig. 4, and the second direction is the direction Z. The two first edge portions 121 are opposite sides of the temperature equalizing plate 12 along the second direction Z, and the plurality of cooling pipes 14 are sequentially arranged along the first direction X.

Wherein one end of the cooling duct 14 is provided on one of the second edge portions 122, and the other end of the cooling duct 14 is provided on the other second edge portion 122. The cooling pipes 14 communicate with each other to form a cooling circuit.

Specifically, as shown in fig. 5, the battery pack 100 further includes a water inlet pipe 161, a water outlet pipe 162, and a transfer pipe 163, and the plurality of cooling pipes 14 are divided into at least one cooling unit, each cooling unit includes two cooling pipes, a first cooling pipe and a second cooling pipe, respectively, and as shown in fig. 5, the plurality of cooling pipes 14 are divided into 4 cooling units in total. The water inlet of the first cooling pipeline is communicated with the water inlet pipeline 161, the water outlet of the first cooling pipeline and the water outlet of the second cooling pipeline are communicated with the same adapting pipeline 163, and the water outlet of the second cooling pipeline is communicated with the water outlet pipeline 162, so that cooling liquid enters the first cooling pipeline from the water inlet pipeline 161, flows to the second cooling pipeline through the adapting pipeline 163 and flows out of the water outlet pipeline 162, and the cooling effect on the battery pack 100 is realized.

Wherein, a plurality of cooling units are arranged in proper order along the first direction X, every two cooling units are a set of, and the first cooling pipeline of two cooling units of same group communicates with same inlet channel 161, and the second cooling pipeline of two cooling units of same group communicates with same outlet channel 162, and the first cooling pipeline of different groups of cooling units communicates with different inlet channels, and the second cooling pipeline of different groups of cooling units communicates with different outlet channels to every cooling unit corresponds a switching pipeline. By the above mode, the circulating cooling of the cooling liquid can be realized, and in the circulation path from the water inlet pipeline 161 to the water outlet pipeline 162, the cooling liquid only passes through two cooling pipelines, and the number of the cooling pipelines passing through is small, so that the cooling liquid can keep a low temperature when flowing into the latter cooling pipeline, and the cooling effect of the cooling liquid can be improved.

In this embodiment, the cooling pipe 14 may be integrally extruded with the temperature equalization plate 12 by using an aluminum material, or the cooling pipe 14 and the temperature equalization plate 12 may be separately provided, and when the cooling pipe 14 is separately provided, the cooling pipe 14 may be connected with the temperature equalization plate 12 through a heat conductive adhesive.

In this embodiment, the plurality of unit cells 13 are sequentially arranged along the second direction Z, that is, the plurality of unit cells 13 are sequentially arranged along the length direction of the tray 11, and the length of the unit cells 13 extends along the first direction X. Therefore, for each cooling duct 14, each cooling duct 14 covers all the unit cells 13, which is advantageous in improving the heat dissipation effect. Of course, in other embodiments, the plurality of unit cells 13 may be sequentially arranged along the first direction X, and the length of the unit cells 13 extends along the second direction Z.

In this embodiment, as shown in fig. 6, the heating element 15 is an elongated heating element, and the length of the heating element 15 extends along the direction from one of the first edge portions 121 to the other first edge portion 121, that is, the heating element 15 substantially covers the temperature equalization plate 12 in the second direction Z.

In the embodiment of the present application, the thickness of the cooling pipe 14 is greater than the thickness of the heating element 15, and it should be noted that the thicknesses of the cooling pipe 14 and the heating element 15 refer to the thickness in the third direction Y, and the third direction is the height (thickness) direction of the tray 11, that is, based on the view shown in fig. 4, the thickness of the cooling pipe 14 and the thickness of the heating element 15 extend along the third direction Y. By making the thickness of the cooling pipe 14 larger than that of the heating element 15, friction between the sealing cover 17 and the heating element 15 can be effectively avoided, and the heating element 15 is protected.

In this embodiment, as shown in fig. 4, the battery pack 100 further includes a sealing cover 17 and a sealing foam 18. Wherein, the sealing cover 17 is positioned on the temperature equalizing plate 12 and connected with the tray 11 to cover the top opening of the tray 11. Wherein, the sealing foam 18 is positioned between the sealing cover 17 and the tray 11 to improve the sealability between the sealing cover 17 and the tray 11. Further, the sealing cover 17 may be fixed to the tray 11 by bolts 171, or the sealing cover 17 and the tray 11 may be fixed by rivets or welding, or the like. Moreover, the sealing foam 18 has rebound property, so that the dismounting and repairing requirements of the sealing cover 17 can be met.

Screw holes may be formed in the top surfaces of the first side beam 111 and the second side beam 112 facing the sealing cover 17, and corresponding screw holes may be formed in the sealing cover 17, so that the bolts 171 fix the sealing cover 17 to the tray 11 by being engaged with the screw holes of the first side beam 111 and the second side beam 112 and the screw holes of the sealing cover 17.

In this embodiment of the present application, the temperature equalization plate 12 includes a bearing area for placing the cooling pipe 14 and the heating element 15 and a connection area except for the bearing area, where the thickness of the connection area is greater than that of the bearing area, in other words, the temperature equalization plate 12 is divided into two partial areas, one of the partial areas is used for placing the cooling pipe 14 and the heating element 15, and the other partial area is used as the connection area, where the connection part between the temperature equalization plate 12 and the second end surface 1132 of the reinforcement beam 113 is located in the connection area with a greater thickness, so as to facilitate enhancing the strength of the connection part between the temperature equalization plate 12 and the reinforcement beam 13, and can effectively inhibit the arching of the single battery 13 after multiple charging and discharging.

The connection member 124 is further disposed on the temperature equalizing plate 12, and the connection member 124 is used for being connected with a vehicle body of the vehicle, wherein the vehicle body may refer to other structures except for the battery pack in the electric vehicle, and the other structures may be considered as a part of the vehicle body, for example, the connection member 124 is used for being connected with a beam of a vehicle seat so as to improve the vibration mode of the battery pack 100. More specifically, a through hole 172 is provided in the sealing cover 17 at a position corresponding to the connection member 124 of the temperature equalizing plate 12, and the connection member 124 passes through the through hole 172 to protrude out of the battery pack 100 to be connected to the vehicle body. The connecting piece 124 may be, for example, a fixing nut, each fixing nut is sleeved with a sealing ring, and the fixing nuts and the vehicle body may be connected by brazing.

In addition, the connecting member 124 may be disposed in a connection region of the temperature equalizing plate 12, that is, a connection region of the temperature equalizing plate 12 and the vehicle body is located in a connection region with a larger thickness, which is beneficial to improving the stability of the battery pack 100 on the vehicle.

In this embodiment, as shown in fig. 7, the tray 11 is further provided with a lifting lug 114, and the lifting lug 114 is provided with a mounting hole, so that the mounting hole is fixed with the body of the vehicle, for example, by a bolt, and the tray 11 is further mounted on the body. Thus, by fixing the tray 11 to the vehicle body and fixing the temperature equalizing plate 12 to the vehicle body, the firmness of the battery pack 100 on the vehicle can be further improved, and the occurrence of rattling of the battery pack during running of the vehicle can be further reduced.

In the embodiment of the present application, the second side beams 112 may be in an L-shaped structure, including a vertical frame 1122 and a horizontal frame 1123, where the horizontal frame 1123 is located at a bottom opening of the accommodating space 110, and the horizontal frames 1123 of the two second side beams 112 are oppositely disposed to jointly enclose the bottom opening of the accommodating space 110, where the top opening and the bottom opening of the accommodating space 110 are oppositely disposed along a third direction, and the third direction is a direction Y shown in fig. 4. The battery pack 100 further includes a bottom plate 22 and a protection plate 23, wherein the bottom plate 22 is connected with the horizontal frame 1123 to respectively accommodate the bottom openings of the spaces 110, and is located on the same plane as the horizontal frame 1123 to jointly carry the unit batteries 13.

The battery pack 100 further includes heat conductive

structural adhesives

24 and 25, the bottom of the unit battery 13 is connected with the horizontal frame 1123 and the bottom plate 22 through the heat conductive structural adhesive 25, and the bottom plate 22 is connected with the horizontal frame 1123 through the heat conductive structural adhesive 24 to seal the bottom opening of the receiving space 110. The protection plate 23 is located on a surface of the bottom plate 22 opposite to the single battery 13, and is fixed to the horizontal frame 1123, for example, by screwing the bolt 26 to the horizontal frame 1123.

By adhering the horizontal frame 1123 to the unit cell 13, the pressing force received by the second side beam 112 can be transmitted to the case of the unit cell 13, and the pressing resistance of the tray 11 can be further improved.

The embodiment of the application also provides an electric vehicle, which comprises a battery pack, wherein the battery pack is the battery pack described in any embodiment.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, comprising:

the tray comprises edge beams and reinforcing beams, wherein the edge beams enclose an accommodating space of the tray, the reinforcing beams are arranged in the accommodating space and are connected with the edge beams, the lengths of the reinforcing beams extend along a first direction, the reinforcing beams are provided with two opposite first end surfaces in the first direction, and the accommodating space is provided with a top opening; the side beams comprise two first side beams and two second side beams;

the temperature equalization plate is arranged at the top opening of the accommodating space and comprises an inner surface facing the accommodating space and an outer surface opposite to the inner surface, the temperature equalization plate is provided with two opposite first edge parts in the first direction, and the inner surface of each first edge part is provided with a limit boss protruding relative to the inner surface, wherein the limit boss positioned on the same side in the first direction is abutted with the first end face;

the temperature equalization plate comprises a second edge part, and the two second edge parts are respectively arranged on the two first side beams; the outer surface of the temperature equalization plate is provided with a plurality of cooling pipelines which are sequentially arranged, the cooling pipelines are divided into at least one cooling unit, the cooling unit at least comprises a first cooling pipeline and a second cooling pipeline, the first cooling pipeline is communicated with a water inlet pipeline, a water outlet of the first cooling pipeline and a water inlet of the second cooling pipeline are both communicated with the same switching pipeline, and cooling liquid enters the first cooling pipeline from the water inlet pipeline, flows to the second cooling pipeline through the switching pipeline and flows out from a water outlet pipeline;

the single battery comprises a shell, the length of the single battery extends along the first direction, the single battery comprises a pole used for leading out current, the pole comprises a positive pole and a negative pole, the positive pole and the negative pole are positioned at the same end or two opposite ends of the single battery along the first direction, and the pole is arranged towards the second boundary beam; the inner surface of one of the second side beam and the first edge part facing the accommodating space is provided with a clamping groove, the other one of the second side beam and the first edge part is inserted into the clamping groove, and the inner surface of the temperature equalizing plate is adhered with the shell of the single battery through heat conduction structural adhesive.

2. The battery pack of claim 1, wherein the limit boss is integrally formed with the temperature equalization plate.

3. The battery pack according to claim 1, wherein a width of the tray extends in the first direction, a length of the tray extends in the second direction, a thickness of the tray extends in the third direction, and a top opening of the receiving space is located at one side of the tray in the third direction;

the two first side beams are positioned on two opposite sides of the tray along the second direction, the two second side beams are positioned on two opposite sides of the tray along the first direction, and the reinforcing beams are parallel to the first side beams.

4. The battery pack according to claim 3, wherein the reinforcement beam has a second end surface facing the inner surface of the temperature equalizing plate in the third direction, the temperature equalizing plate is connected to the reinforcement beam, and the connection portion is located at the second end surface of the reinforcement beam.

5. A battery pack according to claim 3, wherein a heating member is provided between adjacent two of the cooling pipes;

6. The battery pack according to claim 5, wherein the lengths of the cooling duct and the heating member extend in the second direction, and a plurality of the cooling ducts are arranged in order in the first direction.

7. The battery pack according to claim 5, wherein the heating member is a heating film, and the temperature equalizing plate is integrally extrusion-molded with the cooling pipe;

the thickness of the cooling pipeline is larger than that of the heating piece.

8. The battery pack according to claim 3, further comprising a plurality of unit cells disposed in the receiving space, the plurality of unit cells being sequentially arranged in the second direction, the lengths of the unit cells extending in the first direction.

9. An electric vehicle comprising the battery pack of any one of claims 1-8.