CN220753599U - Battery pack and energy storage system - Google Patents

Abstract

The application provides a battery package and energy storage system, wherein the battery package includes box and battery module, is provided with sliding structure on the side of box inner wall or battery module, and sliding structure extends along the extending direction of the side of its place box inner wall or battery module, and battery module can slide into the box along sliding structure. The battery module is arranged in the box body in a sliding manner, so that the assembly procedure of the battery pack is reduced, the disassembly and the replacement of the battery module are convenient, and the assembly efficiency of the battery pack is improved.

Description

Battery pack energy storage system

Technical Field

The application relates to the technical field of energy storage, in particular to a battery pack and an energy storage system.

Background

In order to solve the problems of global climate change and the like caused by the massive use of fossil energy sources, clean energy replacing fossil energy is actively sought by each country, and wind power and photovoltaic installation are continuously growing. Because of the characteristics of unstable and unbalanced clean energy power generation, electrochemical energy storage with the advantages of high environmental adaptability, high response speed, high power, high energy density and the like is expected to become a mainstream route for future energy storage. At the same time, the method comprises the steps of, and higher requirements are put on various performances such as the safety, the cycle life and the like of the energy storage product.

In order to adapt to the application scenario of large-capacity energy storage, a plurality of single batteries are generally connected in series to form a battery module, and then the battery module is assembled into a battery pack. When the traditional battery module is assembled into a battery pack, a top-down assembly mode is generally adopted, the battery module is usually assembled into the lower box body in a lifting mode, and then fixing the structure, a special production line and equipment are required to execute hoisting action, and the assembly process is complex. And when the battery module breaks down and needs to be replaced, the battery module is taken out and special production lines and equipment are needed, so that the maintenance difficulty is increased.

Disclosure of Invention

The application provides a battery package and energy storage system through the inside sliding construction of box to the battery package for battery module is inside along sliding construction roll-in box, adopts the mode of smooth dress to install battery module to the box inside, simplifies the assembly process of battery package, has made things convenient for the maintenance and the change of battery package.

In a first aspect, the present application provides a battery pack, the battery pack including a case, a battery module and two sliding structures, the case being configured to accommodate the battery module and the two sliding structures, the battery module including a plurality of battery cells, the plurality of battery cells being connectable in series/parallel/series-parallel manner, the two sliding structures being arranged between the battery module and the case. The two sliding structures can be located on the battery module or inside the box body, when the two sliding structures are located on the inner wall of the box body, the two sliding structures extend along the extending direction of the inner wall where the two sliding structures are located, and when the two sliding structures are located on the side face of the battery module, the two sliding structures extend along the extending direction of the side face where the two sliding structures are located. The battery module can be pushed into the box body along the sliding structure, when the battery module is damaged and needs to be replaced and maintained, the battery module can slide out of the box body along the sliding structure, a hoisting process is not needed, the assembly flow and the working procedure of the battery module are simplified, the disassembly and the replacement of the battery module are facilitated, and the assembly efficiency of the battery pack is improved.

And, because sliding structure is located between battery module and the box, sliding structure can play certain spacing effect to the battery module, prevents to rock in the box at the in-process of handling battery package. In addition, because sliding construction's setting, the inner wall of battery module and box can not direct contact, but can have certain gap, and this gap can act as the radiating channel on the one hand, improves battery module's radiating effect, and on the other hand can provide certain stress space for battery module later stage ageing volume expansion that brings, prevents that the box from extruding battery module, promotes the security performance of battery package.

In one possible implementation manner, the case includes a top wall, a bottom wall, two side walls and a rear wall, wherein the two side walls are disposed opposite to each other, the surface disposed opposite to the rear wall is an opening of the case, and the battery module can slide into the case through the opening.

In one possible implementation manner, the two sliding structures are located on the inner surface of the bottom wall, the two sliding structures extend along the extending direction of the bottom wall, the two sliding structures are arranged at intervals along the interval direction of the two side walls, and the battery module can slide into or slide out of the box body from the opening along the two sliding structures on the bottom wall. When the battery module is assembled into the case, the battery module may be slid into the case through the sliding structure of the bottom wall, or, when the battery module needs maintenance or replacement, the battery module may be slid out of the case through the sliding structure of the bottom wall. The battery module is installed inside the case in a sliding manner, the number of structural members and connection screws is reduced, meanwhile, the assembly procedure of the battery pack is reduced, the disassembly and the replacement of the battery module are convenient, and the assembly efficiency of the battery pack is improved. In addition, the arrangement of the two sliding structures on the bottom wall avoids direct contact between the battery module and the bottom wall, and provides a stress space for volume expansion of the battery module in the height direction of the box body.

In a possible implementation manner, the interval distance between the two sliding structures is greater than the interval distance between any one sliding structure of the two sliding structures and the adjacent side wall of the sliding structure, so that the sliding structure plays a certain structural supporting role on the battery module, the stability of the battery module in the sliding process is maintained, and toppling cannot occur.

In one possible implementation manner, the two sliding structures are respectively located on two opposite side walls, the two sliding structures extend along the extending directions of the side walls where the two sliding structures are respectively located, and orthographic projections of the two sliding structures in the interval directions along the two side walls overlap. The battery module can be pushed into the box along the sliding structures which are opposite to each other on the two side walls, so that a hoisting process is not needed, and the assembly flow and process of the battery module are simplified. And the design of sliding structure has avoided battery module direct and inner wall contact, has realized the electrical insulation between battery module and the box inner wall.

In one possible implementation manner, the battery module includes six sides, two sliding structures are located on any one of the six sides of the battery module, the two sliding structures extend along the extending direction of the side where the two sliding structures are located, and the two sliding structures are arranged at intervals along the perpendicular direction to the extending direction of the two sliding structures. The battery module can be pushed into the box along the sliding structure arranged on the same side, so that a hoisting process is not needed, and the assembly flow and process of the battery module are simplified. The design of the sliding structure avoids the direct contact between the battery module and the side wall of the box body, and realizes the electrical insulation between the battery module and the inner wall of the box body.

In one possible implementation manner, the battery module includes two side surfaces, the two side surfaces are oppositely arranged, the two sliding structures are respectively located on the two side surfaces, the two sliding structures extend along the extending directions of the side surfaces where the two sliding structures are respectively located, and orthographic projections of the two sliding structures in the directions oppositely arranged along the two side surfaces overlap. The battery module can be pushed into the box along the sliding structures arranged on the side surfaces which are oppositely arranged, a hoisting process is not needed, and the assembly flow and process of the battery module are simplified. The design of the sliding structure avoids the direct contact between the battery module and the side wall of the box body, and realizes the electrical insulation between the battery module and the inner wall of the box body.

In one possible implementation, the battery pack includes a stop located between the battery module and the rear wall. The stop portion can enable the battery module to stop sliding forward to the rear wall, so that the battery module is prevented from being damaged by collision between the battery module and the rear wall, and the stop portion can prevent the rear wall from being in direct contact with the battery module, so that electrical insulation between the battery module and the inner wall of the box body is achieved.

In a possible implementation, the stop extends in the direction of the spacing between the two side walls. By increasing the area of the stopper portion, the mechanical strength and stopper strength of the stopper portion are enhanced.

In one possible implementation, the battery pack includes a pressing part, the pressing part is located between the opening and the battery module, the pressing part is used for fixing the box body and the battery module, the battery module is prevented from sliding out of the box body, and the mechanical structural strength and stability of the battery pack are enhanced.

In one possible implementation manner, the pressing part extends along the direction of the bottom wall pointing to the top wall, the pressing part comprises two side surfaces connected with the edge, the two side surfaces can be mutually perpendicular, one side surface is fixedly connected with the side wall of the box body, and the other side surface is fixedly connected with the battery module.

In one possible implementation manner, the pressing part extends along the interval direction of the two side walls, the pressing part comprises three side surfaces connected with the edges, the two side surfaces are oppositely arranged along the interval direction of the two side walls and are fixedly connected with the two side walls of the box body respectively, and the other side surface is fixedly connected with the battery module.

In a possible implementation manner, two lateral walls all include the relative first end and the second end that set up along the extending direction of diapire, and the first end of two lateral walls sets up relatively and all is equipped with first guide part, and first guide part extends along the orientation of diapire directional roof, and first guide part includes the first side and the second side that the edge meets, and the contained angle between two sides is the obtuse angle, the second side with the lateral wall is parallel, and first side is located between lateral wall and the second side, and the contained angle between first side and the lateral wall is the acute angle for the contact surface of first side and battery module tip is the inclined plane, and under the circumstances that the skew appears in the inside direction of battery module just sliding into the box, the inclined plane design helps the direction correction of battery module, makes battery module's slip path be on a parallel with the lateral wall.

In a possible implementation manner, the second ends of the two side walls are oppositely arranged and are respectively provided with a second guide part, the second guide parts extend along the direction of the bottom wall pointing to the top wall, each second guide part comprises a first side face and a second side face, the edges of the first side face and the second side face are connected, an included angle between the two side faces is an obtuse angle, the second side faces are parallel to the side walls, the first side faces are located between the side walls and the second side faces, and an included angle between the first side faces and the side walls is an acute angle. The battery module contacts with the first side face along the opposite both ends that set up of the interval direction of two lateral walls, and the contained angle between first side face and the lateral wall is the acute angle, and the contained angle that sets up for the obtuse angle with the second side makes the contact surface of first side face and battery module be the inclined plane, and under the circumstances that the orientation appears deviating after the battery module is smooth to be adorned in place, the inclined plane design helps the orientation correction of battery module.

In one possible implementation manner, the pressing part extends along the direction of the bottom wall pointing to the top wall, and includes three sides, which are fixedly connected with the case, the first guiding part and the battery module respectively. The surface of the pressing part is provided with a plurality of screw holes, and the side wall corresponding to the screw holes, the first guide part and the battery module are provided with a plurality of corresponding screw holes, and the pressing part is fixed on the box body and the battery module through the matching of the screws and the screw holes, so that the structural stability of the battery module in the box body is further enhanced.

In one possible implementation, the surface of the sliding structure is coated with a self-lubricating material. The self-lubricating material can be polytetrafluoroethylene, graphite, teflon material or polycarbonate PC, or the like, or the material of the sliding structure is self-lubricating material, or the outer surface of the battery module, which is contacted with the two sliding structures, can be coated with the self-lubricating material. The self-lubricating material can reduce friction between the battery module and the sliding structure and improve the assembly efficiency of the battery module.

In a possible implementation manner, the outer surface of the rear wall is provided with an explosion-proof valve, a waterproof breathable film is arranged in the explosion-proof valve, when the battery pack is in a normal working state, gas in the box of the battery pack is exchanged with the outside through the explosion-proof valve, the air pressure balance in the battery pack is maintained, dust and water drops can be prevented from entering the battery pack by the waterproof breathable film, when the air pressure in the battery pack is too high due to thermal runaway in the battery pack, the explosion-proof valve is in an open state, and the gas in the battery pack is rapidly discharged to play an explosion-proof role.

In a possible implementation manner, the periphery of the opening is provided with a flange edge, a plurality of through holes are formed in the flange edge, and a waterproof rubber ring is arranged on the surface of the flange edge, so that the tightness of the battery pack is improved.

In a second aspect, an embodiment of the present application further provides an energy storage system, where the energy storage system includes a plurality of the above-mentioned battery packs, and the plurality of battery packs are stacked from bottom to top, and in any two adjacent battery packs in the plurality of battery packs, an outer surface of a bottom wall of a box of one battery pack contacts with an outer surface of a top wall of a box of another battery pack, and openings of the plurality of battery packs all face a side of the energy storage device. The opening of the battery pack faces the side face of the energy storage device, so that the battery pack is convenient to maintain and replace. A plurality of battery packs are assembled in a stacking mode, the up-down stacking arrangement of any number of battery packs can be realized according to actual needs, the battery capacity is conveniently increased and decreased, and the installation and the operation are convenient.

Drawings

FIG. 1 is a schematic diagram of an application scenario of an energy storage system in one embodiment;

fig. 2 is an exploded view of one construction of a battery pack provided in an embodiment of the present application;

fig. 3 is a schematic structural view of a case of the battery pack according to the embodiment of the present application;

fig. 4 is a schematic structural view of a case of the battery pack according to the embodiment of the present application;

fig. 5 is a sectional view of a battery module of a battery pack provided in an embodiment of the present application;

FIG. 6 is an enlarged view of a partial structure at A shown in FIG. 5 provided in an embodiment of the present application;

FIG. 7 is an enlarged view of a partial structure at B shown in FIG. 5 provided in an embodiment of the present application;

fig. 8 is a schematic structural view of a stop portion in a battery pack according to an embodiment of the present disclosure;

FIG. 9 is a schematic illustration of a battery pack provided in an embodiment of the present application;

fig. 10 is a schematic structural view of a pressing part of a battery pack according to an embodiment of the present application;

fig. 11 is a schematic connection diagram of a pressing part of a battery pack according to an embodiment of the present application;

fig. 12 is a schematic connection diagram of a pressing part of a battery pack according to an embodiment of the present application;

fig. 13 is a schematic connection diagram of a pressing part of a battery pack according to an embodiment of the present application;

fig. 14 is a schematic view of a battery pack according to an embodiment of the present application.

Reference numerals illustrate:

110-a photovoltaic array; a 120-power converter; 130-grid; 140-external load; 150-an energy storage device; 400-battery pack; 401-case a body; 402-a battery module; 4011-a top wall; 4012-sidewalls; 4013—a first guide; 40131-first side of first guide; 40132-second side of first guide; 4014-sliding construction; 4015-a rear wall; 4019-a second guide; 40152-screw; 40153-stopper; 40154-explosion-proof valve; 40191-the first side of the second guide; 40192-second side of the second guide; 4016-flange edges; 4017-a compacting section; 40171 a first side of the pressing part; 40172-second side of the hold-down; 40173-third side of the hold-down; 4018-a bottom wall.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings. However, the example embodiments may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted. The words expressing positions and directions described in the embodiments of the present application are illustrated by way of example in the drawings, but may be changed according to the needs, and all the changes are included in the protection scope of the present application. The drawings of the embodiments of the present application are merely schematic for relative positional relationships and are not representative of true proportions.

In the present embodiments, 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 or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

It is noted that in the following description, specific details are set forth in order to provide an understanding of the present application. This application may be carried out in a variety of other ways than those herein set forth, and similar generalizations may be made by those skilled in the art without departing from the spirit of the application. Therefore, the present application is not limited by the specific embodiments disclosed below.

For ease of understanding, the terms involved in the embodiments of the present application are explained first.

And/or: merely one association relationship describing the associated object, the representation may have three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone.

A plurality of: refers to two or more.

"coupled" is to be broadly interpreted, as referring to, for example, either detachably or non-detachably; may be directly connected or indirectly connected through an intermediate medium. "fixed" is also to be understood broadly, and for example, "fixed" may be direct or may be indirect via an intermediary.

References to directional terms in the embodiments of the present application, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", "top", "bottom", etc., are merely with reference to the orientation of the drawings. The directional terms are used to better and more clearly describe and understand the embodiments of the present application, and do not explicitly or implicitly refer to the device or element as having to have a particular orientation, be constructed and operate in a particular orientation, etc., and therefore should not be construed as limiting the embodiments of the present application.

Embodiments of the present application are described below with reference to the accompanying drawings in the embodiments of the present application.

The following embodiments of the present application provide a battery pack that may be used in an application scenario such as an energy storage system.

For example, fig. 1 illustrates a schematic frame-like structure of a photovoltaic system, as shown in fig. 1, including a photovoltaic array 110, a power converter 120, an energy storage device 150, and an electrical grid 130/external load 140. The power converter 120 may integrate a DC/DC conversion circuit and a DC/AC conversion circuit, and the energy storage device 150 may be located between the DC/DC conversion circuit and the DC/AC conversion circuit, and the energy generated by the photovoltaic array 110 may be charged into the energy storage device 120 after being subjected to voltage boosting or voltage down conversion by the DC/DC conversion circuit. When the electrical energy generated by the photovoltaic array 110 is insufficient to power the grid 130/external load 140, the electrical energy stored in the energy storage device 150 may be transferred to the grid 130/external load 140 via the DC/AC conversion circuit within the power converter 120. On the other hand, the energy storage device 150 may also receive power from the power grid 130, where the AC power output by the power grid 130 is converted into DC power by the DC/AC conversion circuit and then transferred to the energy storage device 150, so as to charge the energy storage device 150. Generally, in order to increase the battery capacity of the energy storage device 150, the energy storage device 150 stacks a plurality of battery packs, and in the process of installing the battery packs, the conventional battery packs need to be suitable for a hoisting process due to the structural design of the upper cover and the lower box, so that the problems of inconvenient installation and difficult replacement and maintenance exist.

Generally, a battery module is formed by connecting a plurality of battery cells in series, parallel or series-parallel connection, and in order to enhance the structural strength and safety performance of the battery module, the battery module and other structural members need to be assembled into a battery pack. Generally, the battery pack comprises a lower box body and a top cover, wherein the battery module is positioned in the lower box body, the top cover seals the battery module in the lower box body, the opening area of the battery pack with the structure is largest, and the battery pack is installed in the box body from the opening in a hoisting mode. Generally, for convenience of lifting, the opening is generally directed upward, and the area of the opening is larger than the area of other side surfaces of the battery pack, so that the side surface of the battery pack with the largest size (the opening surface of the battery pack) needs to be sealed and fixed structurally, and the number of required structural members is large, and the sealing surface is large. In addition, the weight of the battery module is large, the battery module is usually assembled into the lower box body in a lifting manner, then the structure is fixed, special production line equipment is required to execute lifting action, and the assembly process is complex. And when the battery module breaks down and needs to be replaced, professional hoisting equipment is needed for taking out the battery module, so that the maintenance difficulty is increased.

In order to solve the problems that the assembly process of the battery pack is complex and the replacement difficulty is high, the embodiment of the application provides a battery pack, and the battery pack comprises a box body, a battery module and two sliding structures, wherein the box body is used for accommodating the battery module and the two sliding structures, and the two sliding structures are arranged between the battery module and the box body. By arranging the sliding structure between the case and the battery module, the contact area between the battery module and the inner wall of the case is reduced by the arrangement of the sliding structure, thereby reduced the frictional force between battery module and the box inner wall, battery module can slide into the box along two sliding structure in, need not special production line and carries out the hoist and mount action. And, because sliding structure is located between battery module and the box, sliding structure can play certain spacing effect to the battery module, prevents to rock in the box at the in-process of handling battery package. In addition, because sliding construction's setting, the inner wall of battery module and box can not direct contact, but can have certain gap, and this gap can act as the radiating channel on the one hand, improves battery module's radiating effect, and on the other hand can provide certain stress space for battery module later stage ageing volume expansion that brings, prevents that the box from extruding battery module, promotes the security performance of battery package.

The sliding structure of the embodiment of the application may have various examples, for example, the sliding structure may be a protrusion structure located on the battery module or the inner wall of the case, the strip-shaped protrusion extends along the side surface of the battery module where the strip-shaped protrusion is located or the extending direction of the inner wall of the case, when the protrusion is located on the inner wall of the case, the protrusion faces the inner wall of the case, and if the protrusion is located on the battery module, the protrusion faces the inner wall of the case opposite to the battery module. The protruding structure can reduce the area of contact between battery module and the box inner wall, and then reduces the frictional force between battery module and the box inner wall, conveniently with battery module smooth dress to the box in. In addition, the sliding structure can also be a sliding rail or a ball structure, for example, a plurality of parallel guide rails can be arranged on the bottom wall of the box body, the guide rails comprise sliding grooves and sliding blocks arranged in the sliding grooves, and the sliding blocks are in sliding connection with the sliding grooves. The battery module can slide in or slide out of the box body through a plurality of parallel guide rails. For another example, a plurality of balls positioned and rollably disposed inside the positioning seat may be disposed on the bottom wall of the case. Through setting up positioning seat and ball on the diapire of box, because be rolling friction between battery module and the ball when installing battery module inside the box, consequently only need gently push or lightly draw battery module can push the battery module or pull out the battery package, simple structure, convenient assembling has improved the assembly efficiency of battery package. Or still, the inner wall of the box body can be provided with two sliding rails, the side face of the battery module opposite to the inner wall is provided with a pulley, the pulley on the side face of the battery module is in sliding connection with the sliding rail on the inner wall of the box body, and the battery module is matched with the sliding rail through the pulley to slide into the box body.

The number of slide structures may be set to be plural.

For example, two sliding structures may be located on a side of the battery module, the battery module includes six sides, when two sliding structures may be located on the same side of the battery module, the extending directions of the two sliding structures are the same as the extending directions of the sides where the two sliding structures are located, the two sliding structures are arranged at intervals, and the interval directions of the two sliding structures are perpendicular to the extending directions of the two sliding structures. The two sliding structures are arranged on the same side face of the battery module, the sliding structures on the battery module are in direct contact with the inner wall of the box body, the surface where the sliding structures are located and the inner wall of the box body are prevented from being in direct contact, the contact area between the battery module and the inner wall of the box body is reduced, the battery module can be pushed into the box body along the two sliding structures on the side face, a hoisting process is not needed, and the assembly flow and process of the battery module are simplified.

For example, when two sliding structures are located on two side surfaces of the battery module, the extending direction of the two sliding structures is the same as the extending direction of the side surface where the two sliding structures are located, the two sliding structures are arranged at intervals, the interval direction of the two sliding structures is perpendicular to the extending direction of the two sliding structures, and orthographic projections of the two sliding structures in directions of the two side surfaces where the two sliding structures are located are overlapped. The two sliding structures are arranged on the two side surfaces of the battery module, which are oppositely arranged, on one hand, the sliding structures on the two side surfaces play a limiting role on the battery module, and on the other hand, the battery module can be pushed into the box body along the sliding structures on the two side surfaces, so that a hoisting process is not needed, and the assembly flow and process of the battery module are simplified.

For example, the two sliding structures may also be located on an inner wall of the case, where the case includes a top wall, a bottom wall, and two side walls located between the top wall and the bottom wall, where the two side walls are disposed opposite to each other, the two sliding structures may be located on the two side walls disposed opposite to each other, and an extension direction of the two sliding structures is the same as an extension direction of the side wall where the two sliding structures are located, and orthographic projections of the two sliding structures in a direction along an interval of the two side walls overlap. The two sliding structures are arranged on the two side walls of the box body, so that on one hand, the sliding structures on the two side surfaces play a limiting role on the battery module, and on the other hand, the battery module can be pushed into the box body along the sliding structures on the two side walls without hoisting process, and the assembly flow and process of the battery module are simplified.

By way of example, the two sliding structures can also be located on the same inner wall of the case, for example, the two sliding structures are located on the inner surface of the bottom wall, the two sliding structures extend along the extending direction of the bottom wall, the two sliding structures are arranged at intervals along the interval direction of the two side walls, and in a specific installation process, the battery module can be pushed into the case along the sliding structures on the inner surface of the bottom wall, so that a hoisting process is not required, and the assembly flow and process of the battery module are simplified.

When the sliding structure is located on the bottom wall 4018 of the case, the schematic structural view of the sliding structure may refer to fig. 2, the battery pack 400 includes a case 401 and a battery module 402, fig. 3 and fig. 4 are schematic structural views of a side view and an opening view of the case 401, respectively, fig. 5 is a top sectional view of the battery module after being mounted inside the case, the case 401 includes a top wall 4011, a bottom wall 4018, two side walls 4012 and a rear wall 4015, the two side walls 4012 are oppositely disposed, the top wall 4011, the bottom wall 4018, the two side walls 4012 and the rear wall 4015 enclose a receiving cavity, the battery module 402 is located in the receiving cavity, the case 401 is provided with an opening, and the opening is oppositely disposed with the rear wall 4015. The bottom wall 4018 is provided with at least two sliding structures 4014 extending along a z direction, the sliding structures 4014 extend along an x direction, the sliding structures 4014 are arranged at intervals along a y direction, the z direction is a direction that the bottom wall 4018 points to the top wall, the x direction is a direction that an opening points to the rear wall 4015, and the y direction is a direction that one side wall 4012 points to the other side wall 4012. At least two sliding structures 4014 are arranged on the bottom wall 4018 at intervals, the interval distance between the two sliding structures 4014 is smaller than the distance between the sliding structures 4014 and the adjacent side walls 4014, so that the bottom of the battery module 402 is uniformly stressed and cannot incline up and down, and when the battery module 402 is assembled into the box 401, the battery module 402 can be directly pushed into the box along the sliding structures 4014. Unlike the conventional battery pack 400. According to the embodiment of the application, the sliding structure 4014 is arranged on the bottom wall 4018, so that the contact area between the battery module 402 and the box body 401 is reduced, the friction force between the battery module 402 and the bottom wall 4018 is reduced, when the battery module 402 is assembled in the box body 401, the battery module 402 can slide into the box body 401 through the sliding structure 4014 of the bottom wall 4018, or when the battery module 402 needs to be maintained or replaced, the battery module 402 can slide out of the battery pack 400 through the sliding structure 4014 of the bottom wall 4018, in addition, the two sliding structures 4014 can enable the battery module 402 to be not in direct contact with the bottom wall 4018, a certain stress space is provided for volume expansion caused by aging of the battery module 402, and the mechanical stability of the battery pack 400 is improved. The mode that this application embodiment adopted smooth dress installs battery module 402 to box 401 inside, reduced the quantity of structure and connecting screw, reduced the assembly process of battery package 400 simultaneously, made things convenient for the dismouting and the change of battery module 402, improved the assembly efficiency of battery package 400.

Further, the area of the opening of the box body is smaller than the areas of the side wall 4014 and the top wall 4011, compared with the existing assembly mode of hoisting the battery pack up and down, the battery module 402 is sealed inside the box body 401 only by arranging sealing elements around the opening, the sealing path is shorter, the sealing surface is smaller, the possibility of sealing failure is reduced, the use of the sealing elements is saved, and the assembly process of the battery pack is further simplified.

Further, the surface of the sliding structure 4014 may be coated with a self-lubricating material, for example, the self-lubricating material may be polytetrafluoroethylene, graphite, teflon material, or polycarbonate PC, or the like, or the material of the sliding structure 4014 itself may be a self-lubricating material, or the outer surface of the battery module 402 that contacts the two sliding structures may also be coated with a self-lubricating material. The self-lubricating material can reduce friction between the battery module 402 and the sliding structure 4014, and improve assembly efficiency of the battery module 402.

Further, the surface of the sliding structure 4014 on the case 401 is insulated, for example, an insulating material is coated on the surface of the sliding structure 4014, so as to ensure electrical insulation between the battery module 402 and the case 401, and improve insulation reliability of the battery module 402.

Note that, in the embodiment of the present application, the connection manner between the sliding structure 4014 and the bottom wall 4018 of the case 401 is not particularly limited, the sliding structure 4014 and the case 401 may be an integral piece made by an integral molding process, and the sliding structure 4014 may be an independent component and be fixed on the bottom wall 4018 by a process such as welding or die casting.

When the battery module 402 is slid into the case 401, the battery module 402 may be inclined, and therefore, it is necessary to provide a guide portion at the end portion of the side wall 4012 of the case 401 to guide the battery module 402. As shown in fig. 4, a first guide portion 4013 is disposed at an opening of the case 401, the side walls 4012 include a first end and a second end disposed along an x direction, the first ends of the two side walls 4012 disposed opposite to each other are each provided with a first guide portion 4013 disposed opposite to each other along a y direction, the first guide portions 4013 on the two side walls 4012 extend along a z direction, the first guide portions 4013 include a first side surface 40131 and a second side surface 40132, the second side surface 40131 is parallel to the side walls 4012, the first side surface 40131 is located between the side walls and the second side surface 40132, the structure of the first guide portions can be seen with reference to fig. 5 and 6, fig. 5 is a cross-sectional view along the z direction after the battery module 402 is assembled into the case, fig. 6 is an enlarged view at a in fig. 5, an included angle 1 between the first side surface 40131 and the side walls 4012 is an acute angle, and an included angle 2 between the first side surface 40131 and the second side surface 40132 is an obtuse angle; when the battery module just slides into the box, the opposite two ends that set up along the y direction are contacted with first side 40131, angle 1 and angle 2's angle design makes first side 40131 be the inclined plane with battery module 402's contact surface, under the circumstances that battery module 402 just slides into the box 401 internal direction and appears deviating, the inclined plane design helps the direction correction of battery module 402, make battery module 402's slip route be on a parallel with lateral wall 4012, prevent that battery module 402 from skidding askew, simultaneously, the inclined plane design avoids battery module 402's the bump at the slip in-process, play certain guard action to battery module 402.

Similarly, as shown in fig. 5 and 7, fig. 7 is an enlarged schematic diagram of the position B in fig. 5, the second ends of the two side walls 4012 are respectively provided with a second guiding portion 4019, the second guiding portions 4019 on the two side walls 4012 are oppositely arranged along the y direction, the second guiding portions 4019 extend along the z direction, the second guiding portions 4019 include a first side surface 40191 and a second side surface 40192, the second side surface 40192 is parallel to the side walls 4012, the first side surface 40191 is located between the side walls 4012 and the second side surface 40192, an included angle 3 between the first side surface 40191 and the side walls 4012 is an acute angle, and an included angle 4 between the first side surface 40191 and the second side surface 40192 is an obtuse angle. After the battery module 402 is slid in place, two ends of the battery module 402, which are oppositely arranged along the y direction, are in contact with the first side 40191, the contact surface between the first side 40191 and the battery module 402 is an inclined surface due to the angle design of the angle 3 and the angle 4, and the inclined surface design is beneficial to the direction correction of the battery module 402 under the condition that the direction deviates after the battery module 402 is slid in place. The first guide portion 4013 and the second guide portion 4019 are located between the battery module 402 and the side wall 4012, so that the battery module 402 and the side wall 4012 are prevented from being in direct contact, a stress space is provided for volume expansion of the battery module 402 due to aging, the side wall 4012 is prevented from extruding the battery module 402, and safety performance of the battery module 402 is improved.

The first guide portion 4013 and the second guide portion 4019 may be integrally formed with the case 402, or may be separate members. For example, the first guiding portion 4013 may be a sheet metal piece, which is folded into a hollow trapezoid shape as illustrated in fig. 6 and 7 through a bending process, and then welded to the bottom wall 4018 or the top wall 4011 through a welding process.

When the sliding structure may also be located on both side walls 4012 of the battery pack 400, the first guide portion and the second guide portion are located on the top wall 4011 and the bottom wall 4018 of the battery pack 400, respectively.

Further, after the battery module 402 is slidably mounted in place, a plurality of screw holes are provided in the rear wall 4015, and screws 40152 are screwed into the screw holes from the outside to lock the battery module 402 to the case 401, so that the battery module 402 is fixed inside the case 401, as shown in fig. 5. The battery pack 400 is prevented from shaking inside the box 401 during the carrying and using processes, the mechanical reliability of the battery pack 400 is enhanced, and the accuracy of the installation of the battery pack 400 during the production process is improved.

Further, in order to prevent the forward sliding from being continued after the battery module 402 is slid into place, a stopper 40153 may be provided at the rear wall 4015, the stopper 40153 being located between the battery module 402 and the case 401. The position of the stopper 40153 may be as shown in fig. 7, the stopper 40153 may be a separate member, the stopper 40153 may be fixed inside the case by welding or other processes, and the stopper 40153 may be an integral piece integrally formed with the case 401.

The specific shape of the stopper 40153 is not limited in this application, for example, the stopper 40153 may be a part integrally formed with the second guide 4019 by bending or die casting, the structure of which may be as shown in fig. 8, fig. 8 is a schematic structural view of the stopper 40153 in the x direction, the stopper 40153 extends in the y direction, the second guide 4019 extends in the y direction and is a U-shaped part manufactured by bending, and then the U-shaped part is welded inside the case 401 by welding or the like. For another example, the stopper 40153 may be a cross-shaped member fixed to the bottom wall 4018.

In one example, after the battery module 402 is fixed inside the case, in order to prevent the battery pack 400 from falling from the opening during the handling of the battery pack 402, it is necessary to provide a pressing portion 4017 at the opening to press the battery module 402 inside the case 401, and referring to fig. 9, fig. 9 is a schematic view of the structure of the battery module 402 after it is slid inside the case 401.

Further, the pressing portion 4017 may be fixedly connected to the first guiding portion 4013, so as to further enhance mechanical stability of the battery pack 400. As shown in fig. 10, the specific structure of the pressing portion 4017 extends along the z direction, and the pressing portion includes a first side 40171, a second side 40172, and a third side 40173, wherein the first side 40171 is connected to the side wall, the second side 40172 is connected to the first side 40131 of the first guide 4013, and the third side 40173 is connected to the battery module. Fig. 11 is a schematic view showing the connection manner between the pressing parts and the battery module and the case, respectively. By providing the pressing portion 4017 in the opening, the battery module 402 is fixed inside the case 401, and the battery module 402 is prevented from sliding out of the case 401. Specifically, a plurality of screw holes can be formed on the surface of the pressing portion 4017, and a plurality of screw holes corresponding to the screw holes can be formed on the side wall 4012 corresponding to the screw holes, the first guide portion 4013 and the battery module 402, so that the pressing portion 4017 is fixed on the box 401 and the battery module 402 through matching of the screws and the screw holes, and the structural stability of the battery module 402 in the box 401 is further enhanced.

For example, the pressing portion may further include two side surfaces, the two side surfaces are respectively connected with the side wall of the case and the battery module, the pressing portion 4017 extends along the z direction, fig. 12 shows a schematic diagram of a connection manner between the pressing portion and the battery module and the case, the pressing portion 4017 includes two side surfaces with edges connected, the two side surfaces may be mutually perpendicular, the first side surface 40171 is fixedly connected with the side wall 4012 of the case 401, and the second side surface 40172 is fixedly connected with the battery module 402. The two sides of the pressing part 4017 can be integrally formed and fixed with each other by welding, and the pressing part 4017 is arranged at the opening to press the battery module 402 inside the box 401, so that the battery module 402 is prevented from sliding off the opening, and the mechanical stability of the battery pack 400 is enhanced.

For example, the pressing portion may further include three sides, two sides of the three sides are connected to a side wall of the case, the side of the other case is connected to the battery module, the pressing portion 4017 may also extend along the y direction, fig. 13 shows a schematic diagram of a connection manner between the pressing portion and the battery module and the case, the pressing portion 4017 includes three sides connected at edges, the first side 40171 and the second side 40172 are disposed at intervals along the y direction and are fixedly connected to the two side walls 4012 of the case 401, and the third side 40173 is fixedly connected to the battery module 401.

In addition, the sliding structure 4014, the first guide portion 4013, the stopper portion 40153 and the second guide portion 4019 on the bottom wall 4018 of the case 401 ensure that a reliable gap is provided between the battery module 402 and the rear wall 4015 and the two side walls 4012 of the case 401, so that the battery module 402 and the inner wall of the case 401 are not in direct contact, and electrical insulation between the battery module 402 and the case 401 is achieved. On the other hand, the gap provides a self-adjusting jog space for the battery module 402 to heat or age and swell or for the battery module 402 to slosh. The clearance that exists between battery module 402 and the inner wall of box 401 can guarantee to have certain safe distance all the time between battery module 402 and the box 401 inner wall, avoids battery module 402 to lead to the deformation also to appear in the box 401 outside because of expansion force deformation in the use. Meanwhile, the battery module 402 and the box 401 can be prevented from being collided and rubbed in the vibration process to cause failure, and in addition, a certain crumple space exists in the box 401 in the collision and extrusion process, so that the safety of the machine under the abuse scene is improved.

Further, in order to improve the safety performance of the battery pack 400, an explosion-proof valve 40154 is disposed on the outer surface of the rear wall 4015, and a waterproof and breathable film is disposed in the explosion-proof valve to prevent dust and water drops from entering the battery pack. The waterproof and breathable membrane can be made of Expanded Polytetrafluoroethylene (EPTFE) and other materials, and the EPTFE has the pore diameter far larger than gas molecules in the air and far smaller than the particle size of water, dust and other particles, so that waterproof and breathable effects can be well achieved, dynamic internal and external pressure balance can be achieved through internal and external gas exchange, under the normal pressure condition, the explosion-proof valve 40154 is not greatly different from a common waterproof and breathable valve, but under the high pressure condition, the explosion-proof and pressure-releasing state can be achieved, and gas is rapidly discharged, so that the pressure in the battery pack 400 is reduced, and the explosion-proof effect is achieved.

In some examples, as shown in fig. 4, a flange edge 4016 is disposed around the opening of the case 401 of the battery pack 400, and a waterproof rubber ring is disposed on the surface of the flange edge 4016, so that the tightness and the moisture resistance of the battery module 402 can be further improved by using the waterproof rubber ring.

Based on the same inventive concept, the embodiments of the present application also provide an energy storage system, which includes a plurality of the above-mentioned battery packs, the plurality of battery packs are stacked from bottom to top, an outer surface of a bottom wall of a case of one battery pack contacts an outer surface of a top wall of a case of another battery pack, the openings of the battery packs face the side face of the energy storage device, and when the battery needs to be replaced or maintained, the battery module can be directly taken out from the side face opening, so that the battery module can be replaced and maintained conveniently. A plurality of battery packs are assembled in a stacking mode, the up-down stacking arrangement of any number of battery packs can be realized according to actual needs, the battery capacity is conveniently increased and decreased, and the installation and the operation are convenient. The energy storage system that this application embodiment provided piles up a plurality of battery packs, can realize the upper and lower stack setting of arbitrary quantity battery pack according to actual need, conveniently increases and decreases battery capacity, installation convenient operation.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (20)

1. The battery pack is characterized by comprising a box body, a battery module and two sliding structures, wherein the box body is used for accommodating the battery module and the two sliding structures, the battery module comprises a plurality of battery cells, and the two sliding structures are arranged between the battery module and the box body;

the two sliding structures are positioned on the inner wall of the box body and extend along the extending direction of the inner wall where the two sliding structures are positioned, or the two sliding structures are positioned on the side face of the battery module and extend along the extending direction of the side face where the two sliding structures are positioned.

2. The battery pack according to claim 1, wherein the case includes a top wall, a bottom wall, and two side walls and a rear wall between the top wall and the bottom wall, the two side walls being disposed opposite each other, and a face disposed opposite the rear wall being an opening of the case.

3. The battery pack according to claim 2, wherein the two sliding structures are located on the inner surface of the bottom wall, the two sliding structures extend in the extending direction of the bottom wall, and the two sliding structures are disposed at intervals in the spacing direction of the two side walls.

4. The battery pack according to claim 3, wherein the two sliding structures are spaced apart by a distance greater than a spacing distance between any one of the two sliding structures and a side wall of the case adjacent to the sliding structure.

5. A battery pack according to any one of claims 1 to 3, wherein the two sliding structures are respectively located on the two side walls disposed opposite to each other, the two sliding structures extend along the extending directions of the side walls in which they are respectively located, and orthographic projections of the two sliding structures in the direction along the interval of the two side walls overlap.

6. The battery pack according to claim 1 or 2, wherein the battery module includes six sides, the two sliding structures are located on any one of the six sides of the battery module, the two sliding structures extend along an extending direction of the side on which the two sliding structures are located, and the two sliding structures are disposed at intervals in a direction perpendicular to the extending direction of the two sliding structures.

7. The battery pack according to claim 1 or 2, wherein the battery module includes two side surfaces disposed opposite to each other, the two sliding structures are respectively located on the two side surfaces, the two sliding structures extend along the extending directions of the side surfaces in which the two sliding structures are respectively located, and orthographic projections of the two sliding structures in the directions disposed opposite to each other along the two side surfaces overlap.

8. The battery pack of any one of claims 2-4, wherein the battery pack includes a stop between the battery module and the rear wall.

9. The battery pack of claim 8, wherein the stopper extends in a direction of the interval between the two side walls.

10. The battery pack according to any one of claims 2 to 4, wherein the battery pack includes a pressing portion between the opening and the battery module, the pressing portion being for fixing the case and the battery module.

11. The battery pack according to claim 10, wherein the pressing portion extends in a direction in which the bottom wall is directed toward the top wall, the pressing portion includes two side surfaces connected at edges, one of the side surfaces is fixedly connected with the side wall of the case, and the other side surface is fixedly connected with the battery module.

12. The battery pack according to claim 10, wherein the pressing portion extends along a spacing direction of the two side walls, the pressing portion includes three side surfaces with edges connected, two of the side surfaces are disposed opposite to each other along the spacing direction of the two side walls and are fixedly connected with the two side walls of the case, respectively, and the other side surface is fixedly connected with the battery module.

13. The battery pack according to claim 10, wherein the two side walls each include a first end and a second end that are disposed opposite to each other along the extending direction of the bottom wall, the first ends of the two side walls are disposed opposite to each other and each have a first guide portion that extends along the direction in which the bottom wall points to the top wall, the first guide portions include two side surfaces that are edge-on, an included angle between the two side surfaces is an obtuse angle, one of the side surfaces is parallel to the side wall, the other side surface is disposed between the side wall and one of the side surfaces, and an included angle between the other side surface and the side wall is an acute angle.

14. A battery pack according to claim 2 or 3, wherein the second ends of the two side walls are arranged opposite to each other and each have a second guide portion extending in a direction in which the bottom wall is directed toward the top wall, the second guide portions including two side surfaces joined at their edges, the angle between the two side surfaces being an obtuse angle, one of the side surfaces being parallel to the side wall, the other side surface being located between the side wall and one of the side surfaces, the angle between the other side surface and the side wall being an acute angle.

15. The battery pack according to claim 13, wherein the pressing portion extends in a direction in which the bottom wall is directed toward the top wall, and the pressing portion includes three side surfaces fixedly connected with the case, the first guide portion, and the battery module, respectively.

16. The battery pack according to any one of claims 1 to 4, wherein a surface of the sliding structure is coated with a self-lubricating material.

17. The battery pack according to any one of claims 1 to 4, wherein an outer surface of the battery module in contact with the two sliding structures is coated with a self-lubricating material.

18. The battery pack according to any one of claims 2 to 4, wherein an explosion-proof valve is provided on an outer surface of the rear wall, and a waterproof and breathable film is provided in the explosion-proof valve.

19. The battery pack according to any one of claims 2 to 4, wherein a flange is provided around the opening, a plurality of through holes are provided in the flange, and a waterproof rubber ring is provided on the surface of the flange.

20. An energy storage system comprising a plurality of battery packs according to any one of claims 1 to 19, wherein a plurality of the battery packs are stacked, wherein an outer surface of a bottom wall of a case of one battery pack is in contact with an outer surface of a top wall of a case of the other battery pack, and wherein openings of the plurality of battery packs are all directed to sides of the energy storage system.