WO2024066258A1 - Battery pack assembly - Google Patents

Abstract

Disclosed in the present application is a battery pack assembly, comprising a frame body and an upper fixing member, wherein the interior of the frame body is provided with a placement groove in which battery pack units are placed; and the upper fixing member is arranged on the frame body, and presses and fixes corresponding battery pack units into the placement groove. By means of the battery pack assembly disclosed in the present application, each battery pack unit is held in place simply by the upper fixing member pressing same downwards, such that the assembly of the battery pack assembly is more convenient, and the battery pack assembly is convenient to disassemble and is relatively low cost.

Description

Battery pack assembly

This application claims the priority of Chinese patent application No. 2022112161348, filed on September 30, 2022. This application cites the entire text of the above Chinese patent application.

Technical Field

The present application relates to the field of battery packs, and in particular to a battery pack assembly.

Background technique

As a new energy vehicle, electric vehicles have the characteristics of low noise, high energy efficiency and no tail gas emissions, and have become one of the strategic emerging industries supported by my country. Electric vehicles can quickly increase their mileage by quickly replacing battery packs. Compared with charging electric vehicles with charging piles, they are becoming more and more popular among the public due to their high efficiency.

The battery pack assembly in the prior art achieves the battery capacity required by the battery pack assembly by connecting multiple standard battery packs. The battery pack assembly includes a frame connected to the body of the electric vehicle and multiple standard battery packs. The standard battery packs are detachably mounted on the frame by multiple bolts. During the assembly process of the battery pack assembly, the bolt fixing requires a lot of time and the disassembly is inconvenient, resulting in low assembly efficiency.

Application Contents

The technical problem to be solved by the present application is to provide a battery pack assembly to overcome the defect of assembly efficiency caused by the fact that bolt fixing takes a lot of time during the assembly process of the battery pack assembly in the prior art.

This application solves the above technical problems through the following technical solutions:

A battery pack assembly, characterized in that the battery pack assembly comprises a frame body and an upper fixing member, and a placement slot for placing the battery pack assembly is provided in the frame body;

The upper fixing member is disposed on the frame body and the upper fixing member presses and fixes the corresponding battery pack assembly in the placement groove.

In the present solution, the above structure is adopted, and each battery pack assembly only needs to be fixed in position by pressing down on the upper fixing member, so that the assembly of the battery pack assembly is more convenient, efficient, easy to disassemble, and the cost is relatively reduced.

Preferably, the battery pack assembly includes a battery pack unit.

In the present solution, the above structure is adopted, and by setting the battery pack units, the number of battery pack units in the battery pack assembly can be freely adjusted to meet different usage scenarios.

Preferably, the upper fixing member includes an upper bracket body connected to the frame body and an upper bracket connecting flange arranged on the upper bracket body and extending toward the side wall direction of the battery pack unit, and the side wall of the battery pack unit is correspondingly provided with a flange extending toward the upper fixing member. A box end connecting flange extends in the direction of the fixed piece, and the upper fixing piece and the battery pack unit are connected to the box end connecting flange via an upper bracket connecting flange.

In this solution, the above structure is adopted to realize the connection between the battery pack assembly and the upper bracket connecting flange by setting the box end connecting flange, so as to avoid the upper bracket connecting flange being directly connected to the battery pack unit, which would cause the local structural strength of the battery pack unit to be insufficient and thus easy to be damaged.

Preferably, the box end connecting flange is arranged on a side wall of the battery pack unit in the length direction and the box end connecting flange extends horizontally along the length direction of the battery pack unit; or

The box end connecting flange is horizontally arranged on the side wall of the battery pack unit.

In this solution, the above structure is adopted, and the box end connecting flange can strengthen the side wall of the battery pack unit in the length direction, thereby strengthening the structural strength of the battery pack unit in the length direction. Furthermore, by arranging the box end connecting flange around the side wall of the entire battery pack unit to improve the local structural strength, the strengthening effect is better.

Preferably, a threaded hole is formed on the box end connecting flange by embedding a nut, and the upper bracket connecting flange of the upper fixing member is connected to the box end connecting flange through a threaded connector.

In this solution, the above structure is adopted to achieve threaded connection by pre-embedded nuts, which can reduce the strength requirements for the battery pack unit material and can apply non-metallic composite materials to avoid damage caused by direct connection of bolts and other parts.

Preferably, the lower end surface of the upper bracket connecting flange abuts against the upper surface of the box end connecting flange and the upper bracket connecting flange is in surface contact with the box end connecting flange.

In this solution, the above-mentioned structure is adopted, and the upper bracket connecting flange and the box end connecting flange are connected and fixed by surface contact, which simplifies the connection between the two and avoids setting additional structures or openings on the upper fixing part and the battery pack unit, which will cause cost increase or strength loss.

Preferably, the upper fixing member is disposed at an opening of the placement groove, and the upper fixing member is detachably connected to the frame body.

In the present solution, the above structure is adopted, and the upper fixing piece is arranged at the opening and is detachable, which can facilitate the disassembly and assembly of the battery pack assembly, and at the same time better limit the battery pack assembly to prevent it from falling out of the opening.

Preferably, the battery pack assembly includes at least two battery pack units stacked vertically; the battery pack unit in the battery pack assembly that is the longest distance from the bottom of the placement groove is pressed and fixed in the placement groove by an upper fixing member.

In this solution, the above-mentioned structure is adopted, and the battery pack assemblies are stacked vertically. The stacking direction is the same as the pressing direction of the upper fixing member, which makes it more convenient for the upper fixing member to press and limit the battery pack assembly as a whole. At the same time, the battery pack unit on the upper side can also further press the battery pack unit on the lower side through its gravity.

Preferably, the frame body includes an outer box body and a crossbeam, wherein the crossbeam is disposed in the outer box body and divides the outer box body into a plurality of placement grooves.

In this solution, the above structure is adopted, and the outer box body protects the battery pack assembly. The crossbeam can be used to strengthen the overall strength of the battery pack and can also be used to separate the outer box body to form multiple placement slots to place multiple battery pack assemblies.

Preferably, the upper fixing member is disposed at the opening of each placement slot and presses the battery pack in each placement slot. Piece.

In this solution, the above structure is adopted to compress the battery pack assembly from top to bottom by the same upper fixing member, thereby simplifying the fixing of the battery pack assembly.

Preferably, the battery pack assembly also includes a lower fixing member connected to the frame body, and at least one battery pack unit in the battery pack assembly other than the battery pack unit having the largest distance from the bottom of the placement groove is connected to the placement groove via the lower fixing member.

In the present solution, the above structure is adopted, and the stability of the battery pack assembly installed in the placement slot can be further improved by providing a lower fixing member to compress and fix the battery pack units except the top one separately.

Preferably, the lower fixing member includes a lower bracket body detachably connected to the frame body and a lower bracket connecting flange provided on the lower bracket body and extending toward the side wall direction of the battery pack unit, and the side wall of the battery pack unit is correspondingly provided with a box end connecting flange extending toward the direction where the upper fixing member is located;

The lower bracket connecting flange is connected to the box end connecting flange of the battery pack unit.

In the present solution, the above structure is adopted, and by providing lower fixing members, the battery pack units are connected and fixed to the frame units through corresponding lower fixing members, so that the connection of the entire battery pack assembly is more stable.

Preferably, the lower bracket body is connected to the outer box body via a plurality of bolt assemblies, and the plurality of bolt assemblies are embedded in the outer box body and are arranged at intervals along the length direction of the battery pack unit.

In this solution, the above structure is adopted, and the lower fixing member is connected to the outer box body at multiple points, making the connection between the two more firm.

Preferably, the battery pack assembly further comprises a reinforcing gasket;

The bolt assembly includes a bolt and a nut in threaded engagement;

The outer box body includes a cavity extending along the length direction of the battery pack unit, the reinforcing gasket is embedded in the cavity, and a plurality of the bolts sequentially pass through the lower bracket body and then extend into the cavity and are fastened to the reinforcing gasket through the nut.

In this solution, the above structure is adopted to strengthen the gasket to increase the structural strength of the connection point with the outer box during bolt connection, disperse the stress on the connection, and also avoid the bolt connection from damaging the frame unit made of aluminum profile with low strength.

Preferably, the extension direction of the reinforcing gasket is parallel to the length direction of the battery pack unit.

In this solution, the above structure is adopted, and the reinforcing gasket strengthens the local strength of the outer box along the length direction of the battery pack unit.

Preferably, the cavity extends to both ends of the outer box and communicates with the external environment of the outer box.

In the present solution, the above structure is adopted, the reinforcing gasket is of detachable design, and an opening is provided on the outer box body, through which the reinforcing gasket can be conveniently taken out and replaced, thereby facilitating the maintenance of the entire battery pack assembly.

Preferably, the lower bracket body is also connected to the cross beam via a plurality of bolt assemblies, and the plurality of bolt assemblies are embedded in the cross beam and are arranged at intervals along the length direction of the battery pack unit.

In this solution, the above structure is adopted, and the lower fixing member is connected to the outer box body and the cross beam at multiple points, and the connection of the lower fixing member is further strengthened.

Preferably, the lower bracket bodies located on both sides of the cross beam are connected to the cross beam through the same set of bolt assemblies.

In this solution, the above structure is adopted to save parts, reduce the thickness of the beam as much as possible, and make the volume inside the placement groove larger.

Preferably, the lower fixing piece is obtained by extending the frame body toward the inside of the placement groove.

In this solution, the above structure is adopted, and the lower fixing member and the frame body are not detachable, thereby eliminating the step of connecting the lower fixing member and the frame body.

Preferably, the box end connecting flange is located above the lower bracket connecting flange, and a nut is embedded in the box end connecting flange to form a threaded hole, and the lower bracket connecting flange is connected to the box end connecting flange via a threaded connector.

In the present solution, the above structure is adopted, which avoids the defect of low structural strength at the box end connecting flange by embedding nuts, thereby preventing the box end connecting flange from being worn or deformed.

Preferably, a first guide surface is provided at a connection between the side wall and the bottom surface of the battery pack unit, which is inclined relative to a horizontal plane;

The lower fixing member also includes a guide portion connected to the lower bracket body, the guide portion is located above the lower bracket connecting flange, and a second guide surface matching the first guide surface is provided on the guide portion.

In this solution, the above structure is adopted, and the lower fixing member can position and guide the battery pack unit located above in the horizontal direction through the cooperation of the first guide surface and the second guide surface.

Preferably, the first guide surface is a plane and the angle between the first guide surface and the vertical surface is 5° to 20°.

In this solution, the above structure is adopted to achieve a better guiding effect.

Preferably, the battery pack assembly includes a locking mechanism disposed on the crossbeam, and the locking mechanism is used to install the battery pack assembly on the electric vehicle.

In this solution, the above structure is adopted, and the locking mechanism is arranged at the top of the two beams to hoist the battery pack assembly. When the battery pack assembly is hung on the electric vehicle, the force of the battery pack assembly is dispersed.

Preferably, the locking mechanism comprises:

A mounting frame arranged above the crossbeam, the mounting frame comprising a vertical plate and a horizontal plate arranged perpendicular to each other, and the vertical plate and the horizontal plate both extend along the length direction of the battery pack unit, and the horizontal plate is detachably connected to the top of the crossbeam;

A locking shaft is arranged horizontally, and at least one end of the locking shaft is connected to the vertical plate.

In this solution, the above structure is adopted, and the locking mechanism extends to both ends of the outer box along the length direction of the battery pack unit, so that the force on the battery pack assembly is more uniform.

Preferably, it further comprises a push rod mechanism, the push rod mechanism comprises a push rod vertically arranged in the cross beam and a limiting structure, the upper end of the push rod passes through the horizontal plate and extends to the side of the vertical plate connected with the lock shaft, and the limiting structure is arranged on the part of the push rod located above the horizontal plate;

When the push rod mechanism is in the initial state, the push rod is located at the initial position and the limiting structure abuts against the horizontal plate from top to bottom;

When the push rod mechanism is in the unlocked state, the push rod is in the unlocked position, at which time the push rod is lifted up by the external battery replacement device to The upper end of the push rod abuts against the vehicle-end locking mechanism on the electric vehicle and unlocks it.

In this solution, the above-mentioned structure is adopted. By setting up a push rod mechanism, it is possible to conveniently penetrate the battery pack assembly from the bottom of the battery pack assembly and directly interact with the locking mechanism on the top of the battery pack assembly, so as to facilitate the battery replacement equipment to unlock or lock the battery pack assembly to complete the battery replacement operation.

Preferably, a limiting step is provided in the circumference of the portion of the push rod located within the cross beam, a spring is sleeved on the push rod, and two ends of the spring are respectively abutted against the cross beam and the limiting step.

In this solution, the above structure is adopted to provide a restoring force to the top rod to facilitate its downward movement and reset.

Preferably, the locking mechanism and part of the upper fixing member are arranged on the top of the beam in sequence from top to bottom.

In this solution, the above structure is adopted to make the overall structure assembly more reasonable, and the locking mechanism is located at the uppermost side for easy disassembly and assembly.

Preferably, the outer box and the cross beam are made of profiles and have a plurality of hollow cavities.

In this solution, the above structure is adopted to make the overall weight of the frame body lighter.

Preferably, a vertical through hole is provided on the cross beam, and the push rod and the spring are both located in the through hole.

In this solution, the above structure is adopted, and the push rod is integrated into the interior of the cross beam, so that it can be more conveniently aligned with the locking mechanism without occupying the space in the placement groove.

Preferably, the frame body further comprises an upper cover, and the upper cover is detachably connected to the opening of the placement groove via the upper fixing member.

In this solution, the above structure is adopted to close the placement groove through the upper cover to protect the internal battery pack assembly.

Preferably, the battery pack assembly further comprises a manual maintenance switch and a battery terminal electrical connector disposed on the frame body, the battery terminal electrical connector and the manual maintenance switch both partially extend into the placement slot and are connected via wires, and the battery terminal electrical connector is electrically connected to all the battery pack units via the manual maintenance switch;

The electric wire is located in the placement groove.

In this solution, the above structure is adopted, and the manual maintenance switch protects the safety of technicians who repair the battery pack assembly or the electric vehicle installed with it under high voltage environment or responds to sudden events. It can quickly disconnect the connection of the high-voltage circuit, so that maintenance and other work are in a safer state.

Preferably, there are two manual maintenance switches, which are respectively located on both sides of the battery terminal electrical connector.

In this solution, the above structure is adopted to reduce the space occupied by a single manual maintenance switch in the placement slot, thereby leaving more space for the battery pack assembly.

Preferably, the battery pack assembly also includes a water inlet connector and a water outlet connector disposed on the frame body, the water paths of all the battery pack units are interconnected to form a first water path, the water inlet connector is connected to the water inlet of the first water path, and the water outlet connector is connected to the water outlet of the first water path.

In this solution, the above structure is adopted, and the water inlet joint and the water outlet joint are connected to an external water source to cool the battery pack unit in a timely manner.

Preferably, the water inlet joint and the water outlet joint are both connected to the first water circuit via pipelines, and the pipelines are located in the placement groove.

In this solution, the above structure is adopted to conduct water to the inside of the placement slot through a pipeline, so as to facilitate cooling of the battery pack unit in the placement slot.

The positive effects of this application are:

A battery pack assembly disclosed in the present application contains multiple battery pack components. Each battery pack component only needs to be fixed in position by pressing down on the upper fixing part, making the assembly of the battery pack assembly more convenient, efficient, easy to disassemble, and relatively cost-effective.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a battery pack assembly according to Embodiment 1 of the present application.

FIG. 2 is a schematic diagram of the structure of the frame body of Example 1 of the present application.

FIG3 is a schematic structural diagram of the installation state of the battery pack assembly of Example 1 of the present application.

FIG. 4 is a schematic diagram of the internal structure of the battery pack assembly of Example 1 of the present application.

FIG. 5 is a schematic structural diagram of the lower fixing member of Example 1 of the present application.

FIG. 6 is a schematic structural diagram of the lower fixing member of Example 1 of the present application.

FIG. 7 is a schematic structural diagram of the upper fixing member of Example 1 of the present application.

FIG8 is a schematic structural diagram of the upper fixing member of Example 1 of the present application.

FIG. 9 is a schematic structural diagram of the first guide surface of Example 1 of the present application.

FIG. 10 is a schematic structural diagram of the push rod mechanism and the locking mechanism of Example 1 of the present application.

FIG. 11 is a schematic diagram of the internal structure of the ejector mechanism of Example 1 of the present application.

Figure 12 is a schematic structural diagram of the battery pack assembly of Example 2 of the present application.

Description of reference numerals:
Frame body 100; outer box body 110; opening 111; first guide surface 112; second guide surface 113; crossbeam 120; placement groove 130;
Upper cover 200; battery pack assembly 300; battery pack unit 310; box end connecting flange 311; inserts 421, 521; upper fixing member 400; upper bracket body 410; upper bracket connecting flange 420; upper bolt assembly 440; lower fixing member 500; lower bracket body 510; lower bracket connecting flange 520; lower guide portion 530; lower bolt assembly 540; reinforcing gasket 541; locking mechanism 600; horizontal plate 610; vertical plate 620; locking shaft 630; push rod 700; spring 710; limiting step 720; sleeve 730; retaining spring 740.

Detailed ways

The present application is further described below by way of examples, but the present application is not limited to the scope of the examples.

Example 1

As shown in FIGS. 1 to 4 , this embodiment provides a battery pack assembly, which includes a frame body 100 and an upper fixing member. 400 , a placement groove 130 for placing the battery pack assembly 300 is provided in the frame body 100 . The upper fixing member 400 is disposed in the frame body 100 and the upper fixing member 400 presses and fixes the corresponding battery pack assembly 300 in the placement groove 130 .

In this embodiment, as shown in FIG. 2 and FIG. 3 , the frame body 100 includes an outer box body 110 and a crossbeam 120 , and both the outer box body 110 and the crossbeam 120 are made of aluminum profiles, so that the overall weight of the outer box body 110 is lighter.

The outer box body 110 is a box-shaped structure with an open top. Two cross beams 120 are disposed in the outer box body. The cross beams 120 extend to the inner walls at both ends of the outer box body 110 and divide the inner part of the outer box body 110 into three placement slots 130 .

In this embodiment, the upper fixing member 400 can be fixed on the outer box body 110 and the crossbeam 120 .

The outer box 110 protects the battery pack assembly. The crossbeam 120 can be used to enhance the overall strength of the battery pack and to separate the outer box 110 to form a plurality of placement slots 130 for placing a plurality of battery pack assemblies 300 .

The battery pack assembly in this embodiment can include one or more battery pack assemblies 300. The upper fixing member 400 is arranged above the battery pack assembly 300 and is detachably connected to the frame body 100. The bottom surface of its partial structure can, together with the bottom surface of the placement groove 130, apply opposite forces to the battery pack assembly 300 from the upper and lower sides to fix it.

Each battery pack assembly 300 only needs to be fixed in position by pressing the upper fixing member 400 downward, so that the assembly of the battery pack assembly is more convenient, efficient, and relatively cost-effective.

As shown in Fig. 3, the battery pack assembly 300 includes a battery pack unit 310. In this embodiment, the battery pack assembly 300 includes two vertically stacked battery pack units 310, and the number of battery pack units 310 in the battery pack assembly 300 can be adjusted to meet different usage scenarios.

The battery pack unit 310 in this embodiment is an integrated standardized battery cell combination. The battery pack assembly 300 may include multiple battery pack units 310 of the same specification, and the multiple battery pack units 310 are stacked in the vertical direction and placed in the placement groove 130 as a whole, and then fixed as a whole by the upper fixing member 400.

In other embodiments, it can be adjusted to other numbers, such as one or three, according to different requirements.

As shown in Figure 6, the upper fixing member 400 includes an upper bracket body 410 connected to the frame body 100 and an upper bracket connecting flange 420 arranged on the upper bracket body 410 and extending toward the side wall direction of the battery pack unit 310. The side wall of the battery pack unit 310 is correspondingly provided with a box end connecting flange 311 extending toward the upper fixing member 400. The upper fixing member 400 and the battery pack unit 310 are connected via the upper bracket connecting flange 420 and the box end connecting flange 311, that is, the upper bracket connecting flange 420 and the box end connecting flange 311 extend in a direction close to each other.

The upper bracket body 410 of the upper fixing member 400 is detachably connected to the upper end of the outer wall of the frame body 100, and the upper bracket connection flange 420 is set on the upper bracket body 410, and corresponds to the box end connection flange 311 protruding from the side of the battery pack unit 310. When fixed, the upper bracket connection flange 420 is located above the box end connection flange 311 of the uppermost battery pack unit 310 in the battery pack assembly 300, and fits and presses the aforementioned box end connection flange 311 downward to press the battery pack unit 310 downward. The connection position is set on the side of the battery pack unit 310, which can also avoid directly pressing on the top surface of the battery pack unit 310 and crushing the internal battery cells of the battery pack unit 310.

The box end connecting flange 311 is provided to realize the connection between the battery pack assembly and the upper bracket connecting flange 420, thereby preventing the upper bracket connecting flange 420 from being directly connected to the battery pack unit 310, which would cause the local structural strength of the battery pack unit 310 to be insufficient and thus easy to be damaged.

As shown in FIG. 4 , in this embodiment, the box end connecting flange 311 is horizontally arranged on the side wall of the battery pack unit 310, that is, around the battery pack unit 310. Correspondingly, the upper bracket connecting flange 420 is also arranged around the placement groove 130, and can be in contact with the battery pack unit 310 on the entire circumference, so that the force is most uniform and the structure is the most solid.

In other embodiments, the box end connection flange 311 may also be arranged only on the side wall of the battery pack unit 310 in the length direction, and the box end connection flange 311 extends horizontally along the length direction of the battery pack unit 310. In this way, it is only necessary to set the flange on the longer side of the battery pack unit 310, and the upper bracket connection flange 420 also needs to be arranged on both sides, so that the structural layout of the entire battery pack assembly is simpler.

The box end connection flange 311 can strengthen the side wall of the battery pack unit 310 in the length direction, thereby strengthening the structural strength of the battery pack unit 310 in the length direction. Furthermore, by arranging the box end connection flange 311 around the side wall of the entire battery pack unit 310 to improve the local structural strength, the strengthening effect is better.

As shown in FIGS. 3 , 4 , 6 and 7 , the upper fixing member 400 is disposed at the opening of the placement groove 130 , and the upper fixing member 400 is detachably connected to the frame body 100 .

In this embodiment, as shown in FIG. 3 and FIG. 4 , the upper fixing member 400 is disposed at the opening of each placement groove 130 and presses the battery pack assembly 300 in each placement groove 130 .

In this embodiment, the upper fixing member 400 is an integral frame, which is integrally disposed on the upper portion of the frame body 100 and can press the battery pack assembly 300 at the opening of each placement groove 130 .

The battery pack assembly 300 is pressed from top to bottom by the same upper fixing member 400, which simplifies the fixing of the battery pack assembly 300. The opening of the placement groove 130 is the opening at the upper end of the frame body 100, and the battery pack assembly 300 is placed into the placement groove 130 through the opening. The upper fixing member 400 is set at the opening of the placement groove 130, and the upper and lower ends of the battery pack assembly 300 are respectively limited by the upper fixing member 400 and the bottom of the placement groove 130.

In other embodiments, a separate upper fixing member 400 may also be separately disposed at the opening of each placement slot 130 .

In this embodiment, the lower end surface of the upper bracket connecting flange 420 abuts against the upper surface of the box end connecting flange 311 and the upper bracket connecting flange 420 is in surface contact with the box end connecting flange 311 .

As shown in FIG. 3 , the battery pack unit 310 , which is the longest distance from the bottom of the placement groove 130 among the three battery pack assemblies 300 , is pressed and fixed in the placement groove 130 by the same upper fixing member 400 .

In this embodiment, the battery pack assembly 300 includes two vertically stacked battery pack units 310, and the battery pack unit 310 located on the upper side is directly limited and pressed by the upper fixing member 400, and finally transmits the force to the battery pack unit 310 below it to press it as well, while the battery pack unit 310 located below is limited by the bottom surface of the placement groove 130 and plays the role of supporting the battery pack unit 310 thereon.

The two battery pack units 310 of the battery pack assembly 300 are positioned in the horizontal direction by means of concave and convex fit. The stacking direction of the battery pack units 310 is the same as the pressing direction of the upper fixing member 400, which makes it easier for the upper fixing member 400 to press and limit the entire battery pack assembly 300. At the same time, the battery pack unit 310 located on the upper side can also further press the battery pack unit 310 located on the lower side through its gravity.

As shown in Figures 4, 5 and 6, the battery pack assembly also includes a lower fixing member 500 connected to the frame body 100. At least one battery pack unit 310 in the battery pack assembly 300, except for the battery pack unit 310 that is the longest distance from the bottom of the placement groove 130, is connected to the placement groove 130 through the lower fixing member 500. The lower fixing member 500 is used to press the remaining battery pack units 310 that cannot be pressed by the upper fixing member 400.

In this embodiment, since the battery pack assembly 300 includes only two stacked battery pack units, the battery pack unit located at the bottom is connected to the placement groove 130 through the lower fixing member 500. Accordingly, only one lower fixing member 500 is arranged in each placement groove 130.

In other embodiments, depending on the number of battery pack units 310 , a lower fixing member 500 may be provided for each battery pack unit 310 except the uppermost battery pack unit 310 or for a portion of the battery pack units 310 .

By providing a lower fixing member 500 to compress and fix the lower battery pack unit 310 separately, the stability of the battery pack assembly 300 installed in the placement groove can be further improved.

As shown in FIGS. 4 and 6 , the lower fixing member 500 includes a lower bracket body 510 detachably connected to the frame body 100 and a lower bracket connecting flange 520 disposed on the lower bracket body 510 and extending toward the side wall direction of the battery pack unit 310. The side wall of the battery pack unit 310 is correspondingly provided with a box end connecting flange 311 extending toward the direction where the upper fixing member 400 is located. The lower bracket connecting flange 520 is connected to the box end connecting flange 311 of the battery pack unit 310.

The structure of the lower fixing member 500 in this embodiment is basically the same as that of the upper fixing member 400, and the lower bracket body 510 and the lower bracket connecting flange 520 having the same structure and function are not described in detail here.

By providing the lower fixing members 500 , the battery pack units 310 are connected and fixed to the frame units through the corresponding lower fixing members 500 , so that the connection of the entire battery pack assembly 300 is more stable.

As shown in FIGS. 5 and 6 , the lower bracket body 510 is connected to the outer box body 110 via a plurality of lower bolt assemblies 540 . The plurality of lower bolt assemblies 540 are embedded in the outer box body 110 in a horizontal direction and are arranged at intervals along the length direction of the battery pack unit 310 .

In this embodiment, the lower bracket body 510 is fixed to the inner side of the side wall of the outer box body 110 by the lower bolt assembly 540, and the lower fixing member 500 is connected to the outer box body 110 at multiple points, making the connection between the two more secure.

As shown in Figures 1, 5, 6, 7 and 8, the battery pack assembly also includes a reinforcing gasket 541, and the cross-sectional shape of the reinforcing gasket is U-shaped. The lower bolt assembly 540 includes a bolt and a nut that are threadedly engaged. The outer box body 110 includes a cavity extending along the length direction of the battery pack unit 310, and the cavity extends to both ends of the outer box body 110 and is connected to the external environment of the outer box body 110. The reinforcing gasket 541 is horizontally embedded in the cavity at the opening 111 through which the cavity is connected to the external environment, and a number of bolts pass through the lower bracket body 510 in turn and extend into the cavity and are fastened to the reinforcing gasket 541 by nuts.

In this embodiment, the reinforcing gasket increases the structural strength of the connection point with the outer box body during bolt connection, and disperses the stress on the connection. At the same time, it can also prevent the bolt connection from damaging the frame unit made of aluminum profiles with low strength. At the same time, the reinforcing gasket 541 is easy to take and replace, which facilitates the maintenance of the entire battery pack assembly 300.

As shown in Fig. 6, the extension direction of the reinforcing gasket 541 is parallel to the length direction of the battery pack unit 310. The reinforcing gasket strengthens the local strength of the outer box along the length direction of the battery pack unit.

In this embodiment, the upper fixing piece is detachably connected to the outer box body and the top of the crossbeam through the upper bolt assembly 440. In order to increase the structural strength of the upper fixing piece and the frame body at the connection between the bolt assembly, a reinforcing gasket is also provided in the cavity at the position of the outer box body and the crossbeam corresponding to the upper bolt assembly 440.

As shown in FIG. 5 , the lower bracket body 510 is also connected to the side wall of the cross beam 120 through a plurality of lower bolt assemblies 540. The plurality of lower bolt assemblies 540 are embedded in the cross beam 120 and are arranged at intervals along the length direction of the battery pack unit 310, thereby realizing multi-point connection between the lower fixing member 500 and the cross beam 120, and the connection of the lower fixing member 500 is further strengthened.

In other embodiments, in order to save parts, reduce the thickness of the beam 120, and make the volume inside the placement groove 130 larger, the lower bracket body 510 located on both sides of the beam 120 is connected to the beam 120 through the same set of bolt assemblies.

In this embodiment, the cross beam 120 separates the two placement grooves 130, and the placement grooves 130 on both sides are arranged on the lower bracket body 510 of the lower fixing member 500 on the cross beam 120 and connected by a group of lower bolt assemblies 540 passing through the cross beam 120, and the two lower bracket bodies 510 are respectively fixed at both ends of the lower bolt assembly 540.

As shown in FIG. 9 , a first guide surface 112 is provided at a connection between the side wall and the bottom surface of the battery pack unit 310 at an angle relative to the horizontal plane. The first guide surface is a plane and the angle between the first guide surface and the vertical plane is 15°.

The lower fixing member 500 also includes a lower guide portion 530 connected to the lower bracket body 510, the lower guide portion 530 is located above the lower bracket connecting flange 520, and a second guide surface matching the first guide surface 112 is provided on the lower guide portion 530, and the shapes of the first guide surface and the second guide surface and the inclination angle with the vertical surface are consistent.

Through the cooperation between the first guide surface 112 and the second guide surface, the lower fixing member 500 can position and guide the battery pack unit 310 located above in the horizontal direction.

In other specific embodiments, the inclination angle between the first guide surface and the vertical surface may be any angle between 5° and 20°, such as 5°, 10°, 20°, etc., which is selected according to actual needs and will not be elaborated here.

As shown in FIG. 8 and FIG. 10 , the battery pack assembly includes a locking mechanism 600 disposed on the crossbeam 120 , and the locking mechanism 600 is used to install the battery pack assembly on the electric vehicle.

In this embodiment, since there are three placement slots 130 separated by two cross beams 120, the locking mechanism 600 is arranged at the top of the two cross beams 120, so that the lifting is more balanced and the force of the battery pack assembly is dispersed when the battery pack assembly is hung on the electric vehicle.

It includes a locking shaft 630, which cooperates with a locking connection structure at the vehicle end to achieve lifting.

As shown in Fig. 10, the locking mechanism 600 and part of the upper fixing member 400 are sequentially arranged on the top of the crossbeam 120 from top to bottom, so that the overall structure assembly is more reasonable, and the locking mechanism 600 is located at the uppermost side for easy disassembly and assembly.

In this embodiment, the locking mechanism 600 and part of the upper fixing member 400 are integrally mounted on the cross beam 120 , and the locking mechanism 600 is also fixed to the upper end of the cross beam 120 by the upper bolt assembly 440 .

As shown in Figures 8 and 10, the locking mechanism 600 is a prior art. Specifically, the locking mechanism 600 includes a mounting frame arranged above the beam 120 and a plurality of locking shafts 630 arranged at intervals. The mounting frame includes a vertical plate and a horizontal plate 610 arranged perpendicular to each other. There are two vertical plates and one horizontal plate. The two vertical plates are parallel to each other and perpendicular to the horizontal plate. Both the vertical plate and the horizontal plate 610 extend along the length direction of the battery pack unit 310. The horizontal plate 610 is attached to the upper fixing member and is vertically and detachably connected to the top of the beam 120 through the upper bolt assembly.

The lock shaft 630 is placed horizontally and its two ends are respectively connected to the vertical plates on the corresponding sides. When the battery pack assembly is hooked onto the electric vehicle, the force acting on the lock shaft will be transmitted to the vertical plates on both sides respectively, and then dispersed to the entire battery pack assembly through the horizontal plates.

In other specific implementations, only one end of the lock shaft 630 may be connected to the vertical plate, which will not be described in detail here.

As shown in Figure 10, the battery pack assembly also includes a push rod mechanism, which includes a push rod 700 vertically arranged in the cross beam 120 and a limiting structure. The upper end of the push rod passes through the horizontal plate 610 and extends to the side of the vertical plate 620 connected to the locking shaft 630. In this embodiment, the upper end of the push rod extends between the two vertical plates 620, and the limiting structure is arranged on the part of the push rod located above the horizontal plate 610.

When the push rod mechanism is in the initial state, the push rod 700 is located at the initial position and the limiting structure abuts against the horizontal plate 610 from top to bottom.

When the push rod mechanism is in an unlocked state, the push rod 700 is located in an unlocked position. At this time, the push rod 700 is lifted up by the external battery exchange equipment until the upper end of the push rod 700 presses against the vehicle-end locking mechanism 600 on the electric vehicle and unlocks it.

By setting up a push rod mechanism, it is possible to easily penetrate the battery pack assembly from the bottom of the battery pack assembly and directly interact with the locking mechanism at the top of the battery pack assembly, making it convenient for the battery swapping equipment to unlock or lock the battery pack assembly to complete the battery swapping operation.

As shown in FIG. 10 and FIG. 11 , a limiting step 720 is provided around the part of the push rod 700 located inside the cross beam 120 . A spring 710 is sleeved on the push rod 700 . Two ends of the spring 710 are respectively abutted against the cross beam 120 and the limiting step 720 .

Specifically, a sleeve 730 is vertically provided at the position where the push rod 700 passes through the top of the cross beam 120, and the push rod 700 is vertically penetrated in the sleeve 730, the lower end of the spring 710 abuts against the limit step 720, and the upper end of the spring 710 abuts against the lower end of the sleeve 730. In order to prevent the push rod 700 from being over-reset under the elastic restoring force of the spring 710, a clamping spring 740 is clamped at the part of the push rod 700 extending above the horizontal plate, so that the push rod 700 moves downward under the action of the spring 710 until the clamping spring 740 abuts against the upper end of the sleeve 730, at which time, the push rod 700 is in a state of being restored to its original position.

As shown in Fig. 10, a vertical through hole is provided on the cross beam 120, and the top rod 700 and the spring 710 are both located in the through hole. The top rod 700 is integrated inside the cross beam 120, and can be more conveniently aligned with the locking mechanism 600 without occupying space in the battery pack.

As shown in Fig. 1, the frame body 100 further includes an upper cover 200, which is detachably connected to the opening of the placement groove 130 via an upper fixing member 400. The placement groove 130 is closed by the upper cover 200 to protect the internal battery pack assembly.

As shown in FIG1 , the battery pack assembly further includes a manual maintenance switch (not shown) and a battery terminal electrical connector (not shown) disposed on the frame body 100. The battery terminal electrical connector and the manual maintenance switch are partially extended into the placement slot 130 and are connected through wires. The battery terminal electrical connector is electrically connected to all battery pack units 310 through the manual maintenance switch. The wires are located in the placement slot 130.

The manual maintenance switch protects the safety or emergency response of technicians who are repairing the battery pack assembly or the electric vehicle equipped with it under high voltage environment. In the event of a sudden event, the high-voltage circuit connection can be quickly disconnected, making maintenance and other work in a safer state.

As shown in FIG1 , there are two manual maintenance switches, which are respectively located on both sides of the battery terminal electrical connector, so as to reduce the space occupied by a single manual maintenance switch in the placement slot 130 , thereby leaving more space for the battery pack assembly 300 .

The battery pack assembly also includes a water inlet connector and a water outlet connector arranged on the frame body 100. The water paths of all battery pack units 310 are interconnected to form a first water path. The water inlet connector is connected to the water inlet of the first water path, and the water outlet connector is connected to the water outlet of the first water path.

The water connector and the water outlet connector are connected to an external water source to cool down the battery pack unit 310 in a timely manner.

The water inlet connector and the water outlet connector are both connected to the first water channel through pipelines, and the pipelines are located in the placement groove 130 .

Water is conducted to the interior of the placement groove 130 through a pipeline, so as to facilitate cooling of the battery pack unit 310 in the placement groove 130 .

Example 2

This embodiment 2 discloses another battery pack assembly. The structure of the battery pack assembly of embodiment 2 is basically the same as that of embodiment 1, except that the connection method between the upper bracket connecting flange 420 of the upper fixing member 400 and the box end connecting flange 311 and the connection method between the lower bracket connecting flange 520 and the box end connecting flange 311 are different.

As shown in FIG12 , a threaded hole is formed on the box end connection flange 311 by embedding a nut, and the upper bracket connection flange 420 of the upper fixing member 400 is located below the box end connection flange 311 and is connected to the box end connection flange 311 through a threaded connection member. In other specific embodiments, the box end connection flange 311 may also be located above the upper bracket connection flange 420, which will not be described in detail here.

As shown in FIG. 12 , the box end connecting flange 311 is located above the lower bracket connecting flange 520 , and a nut is embedded in the box end connecting flange 311 to form a threaded hole, and the lower bracket connecting flange 520 is connected to the box end connecting flange 311 via a threaded connector.

In this embodiment, the embedded nut is disposed in the embedding pieces 421 , 521 , and the embedding pieces 421 , 521 are pre-disposed inside the upper bracket connecting flange 420 and the lower bracket connecting flange 520 .

On the premise of being pressed and fixed, the two can be further fixed by bolts to make the fixation more firm.

By pre-embedded nuts to achieve threaded connection, the strength requirements for the material of the battery pack unit 310 can be reduced, and non-metallic composite materials can be used to avoid damage caused by direct connection to parts such as bolts.

As shown in Fig. 11, the lower fixing member 500 is obtained by extending the frame body toward the inside of the placement groove 130. The lower fixing member 500 and the frame body 100 in this embodiment are not removable, thereby eliminating the step of connecting the lower fixing member 500 with the frame body 100.

Although the specific implementation methods of the present application are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present application is defined by the appended claims. Those skilled in the art may make various changes or modifications to these implementation methods without departing from the principles and essence of the present application, but these changes and modifications all fall within the protection scope of the present application.

Claims (20)

1. A battery pack assembly, characterized in that the battery pack assembly comprises a frame body and an upper fixing member, wherein a placement slot for placing the battery pack assembly is provided in the frame body;

   The upper fixing member is disposed on the frame body and the upper fixing member presses and fixes the corresponding battery pack assembly in the placement groove.
2. The battery pack assembly as described in claim 1 is characterized in that the battery pack component includes a battery pack unit.
3. The battery pack assembly according to claim 2, characterized in that the upper fixing member comprises an upper bracket body connected to the frame body and an upper bracket connecting flange provided on the upper bracket body and extending toward the side wall direction of the battery pack unit, the side wall of the battery pack unit is correspondingly provided with a box end connecting flange extending toward the upper fixing member, and the upper fixing member and the battery pack unit are connected via the upper bracket connecting flange and the box end connecting flange;

   Preferably, the box end connecting flange is arranged on a side wall of the battery pack unit in the length direction and the box end connecting flange extends horizontally along the length direction of the battery pack unit; or

   The box end connecting flange is horizontally arranged on the side wall of the battery pack unit.
4. The battery pack assembly according to claim 3 is characterized in that a threaded hole is formed on the box end connecting flange by embedding a nut, and the upper bracket connecting flange of the upper fixing member is connected to the box end connecting flange through a threaded connector;

   And/or, the lower end surface of the upper bracket connecting flange abuts against the upper surface of the box end connecting flange and the upper bracket connecting flange is in surface contact with the box end connecting flange.
5. The battery pack assembly according to any one of claims 1 to 4 is characterized in that the upper fixing member is arranged at the opening of the placement groove, and the upper fixing member is detachably connected to the frame body.
6. The battery pack assembly according to any one of claims 2 to 5, characterized in that the battery pack assembly comprises at least two battery pack units stacked vertically; the battery pack unit in the battery pack assembly that is the longest in distance from the bottom of the placement groove is pressed and fixed in the placement groove by an upper fixing member;

   Preferably, the frame body comprises an outer box body and a crossbeam, wherein the crossbeam is disposed in the outer box body and divides the outer box body into a plurality of the placement grooves.
7. The battery pack assembly as described in claim 6 is characterized in that the upper fixing member is arranged at the opening of each of the placement grooves and presses the battery pack assembly in each of the placement grooves.
8. The battery pack assembly according to claim 6 or 7, characterized in that the battery pack assembly further comprises a lower fixing member connected to the frame body, and at least one battery pack unit in the battery pack assembly other than the battery pack unit having the largest distance from the bottom of the placement groove is connected to the placement groove through the lower fixing member;

   Preferably, the lower fixing member includes a lower bracket body detachably connected to the frame body and a lower bracket body disposed on the lower bracket body and A lower bracket connecting flange extending toward the side wall of the battery pack unit, and a box end connecting flange extending toward the direction where the upper fixing piece is located is correspondingly provided on the side wall of the battery pack unit;

   The lower bracket connecting flange is connected to the box end connecting flange of the battery pack unit.
9. The battery pack assembly according to claim 8, characterized in that the lower bracket body is connected to the outer box body by a plurality of bolt assemblies, and the plurality of bolt assemblies are embedded in the outer box body and arranged at intervals along the length direction of the battery pack unit;

   Preferably, the battery pack assembly further comprises a reinforcing gasket;

   The bolt assembly includes a bolt and a nut in threaded engagement;

   The outer box body includes a cavity extending along the length direction of the battery pack unit, the reinforcing gasket is embedded in the cavity, and the plurality of bolts sequentially pass through the lower bracket body and then extend into the cavity and are fastened to the reinforcing gasket through the nut.
10. The battery pack assembly according to claim 9, characterized in that the extension direction of the reinforcing gasket is parallel to the length direction of the battery pack unit;

    Preferably, the cavity extends to both ends of the outer box and communicates with the external environment of the outer box.
11. The battery pack assembly according to any one of claims 8 to 10, characterized in that the lower bracket body is further connected to the cross beam by a plurality of bolt assemblies, and the plurality of bolt assemblies are embedded in the cross beam and arranged at intervals along the length direction of the battery pack unit;

    Preferably, the lower bracket bodies located on both sides of the cross beam are connected to the cross beam through the same set of bolt assemblies.
12. The battery pack assembly according to any one of claims 8 to 11, characterized in that the lower fixing member is obtained by extending the frame body toward the inside of the placement groove;

    Preferably, the box end connecting flange is located above the lower bracket connecting flange, and a nut is embedded in the box end connecting flange to form a threaded hole, and the lower bracket connecting flange is connected to the box end connecting flange via a threaded connector.
13. The battery pack assembly according to any one of claims 8 to 12, characterized in that a first guide surface is provided at a connection between the side wall and the bottom surface of the battery pack unit, which is inclined relative to a horizontal plane;

    The lower fixing member further comprises a guide portion connected to the lower bracket body, the guide portion is located above the lower bracket connection flange, and the guide portion is provided with a second guide surface matching the first guide surface;

    Preferably, the first guide surface is a plane and the angle between the first guide surface and the vertical surface is 5° to 20°.
14. The battery pack assembly according to any one of claims 6 to 13, characterized in that the battery pack assembly comprises a locking mechanism disposed on the crossbeam, and the locking mechanism is used to install the battery pack assembly on the electric vehicle;

    Preferably, the locking mechanism comprises:

    A mounting frame arranged above the crossbeam, the mounting frame comprising a vertical plate and a horizontal plate arranged perpendicular to each other, and the vertical plate and the horizontal plate both extend along the length direction of the battery pack unit, and the horizontal plate is detachably connected to the top of the crossbeam;

    A locking shaft is arranged horizontally, and at least one end of the locking shaft is connected to the vertical plate.
15. The battery pack assembly according to claim 14 is characterized in that it also includes a push rod mechanism, wherein the push rod mechanism includes a vertical A top rod and a limiting structure are placed in the cross beam, the upper end of the top rod passes through the horizontal plate and extends to the side of the vertical plate connected to the locking shaft, and the limiting structure is arranged on the part of the top rod located above the horizontal plate;

    When the push rod mechanism is in the initial state, the push rod is located at the initial position and the limiting structure abuts against the horizontal plate from top to bottom;

    When the push rod mechanism is in an unlocked state, the push rod is in an unlocked position, at which time the push rod is lifted upward by the external battery-changing device until the upper end of the push rod presses against the vehicle-end locking mechanism on the electric vehicle and unlocks it;

    Preferably, a limiting step is provided on the circumference of the portion of the push rod located inside the cross beam, a spring is sleeved on the push rod, and two ends of the spring are respectively abutted against the cross beam and the limiting step.
16. The battery pack assembly according to claim 15, characterized in that the locking mechanism and part of the upper fixing member are sequentially arranged on the top of the beam from top to bottom;

    Preferably, the outer box and the crossbeam are made of profiles and have a plurality of hollow cavities;

    Preferably, a vertical through hole is provided on the cross beam, and the push rod and the spring are both located in the through hole.
17. The battery pack assembly according to any one of claims 1 to 16 is characterized in that the frame body also includes an upper cover, and the upper cover is detachably connected to the opening of the placement groove through the upper fixing member.
18. The battery pack assembly according to any one of claims 2 to 17, characterized in that the battery pack assembly further comprises a manual maintenance switch and a battery end electrical connector disposed on the frame body, the battery end electrical connector and the manual maintenance switch both partially extend into the placement slot and are connected via wires, and the battery end electrical connector is electrically connected to all the battery pack units via the manual maintenance switch;

    The electric wire is located in the placement groove.
19. The battery pack assembly as described in claim 18 is characterized in that there are two manual maintenance switches and they are respectively located on both sides of the battery end electrical connector.
20. The battery pack assembly according to any one of claims 2 to 19, characterized in that the battery pack assembly further comprises a water inlet connector and a water outlet connector provided on the frame body, the water paths of all the battery pack units are interconnected to form a first water path, the water inlet connector is in communication with a water inlet of the first water path, and the water outlet connector is in communication with a water outlet of the first water path;

    Preferably, the water inlet joint and the water outlet joint are both connected to the first water circuit via pipelines, and the pipelines are located in the placement groove.