WO2022110768A1

WO2022110768A1 - Battery pack and vehicle

Info

Publication number: WO2022110768A1
Application number: PCT/CN2021/100302
Authority: WO
Inventors: 钱诚; 周燕飞; 张中林
Original assignee: 比亚迪股份有限公司
Priority date: 2020-11-26
Filing date: 2021-06-16
Publication date: 2022-06-02
Also published as: CN114552110A

Abstract

The present invention relates to a battery pack and a vehicle. The battery pack comprises an upper lid, a tray, pressing strips, and a plurality of battery modules. Two ends of each battery module in the X direction are abutted against the inner wall of the tray, and the pressing strips are provided between two adjacent battery modules in the Y direction. Each pressing strip comprises a pressing plate and a vertical pressing rib connected to the bottom surface of the pressing plate, and the bottom surface of the pressing plate presses edges of opposite sides of the top surfaces of the two adjacent battery modules in the Y direction. Two ends of the pressing plate in the X direction are fixed on the tray. The vertical pressing rib is inserted in a gap between the two adjacent battery modules. An elastic protrusion extending into the gap is provided on the side surface of the battery module facing the vertical pressing rib. Two side surfaces of the vertical pressing rib in the Y direction are abutted against the elastic protrusions on both sides thereof.

Description

Battery packs and vehicles

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent application number "202011348922.3" filed by BYD Co., Ltd. on 2020-11-26 with the name of the invention "battery pack and vehicle".

technical field

The invention belongs to the technical field of new energy vehicles, and in particular relates to a battery pack and a vehicle.

Background technique

With the intensification of market competition, the demand for the cruising range of the battery pack for hybrid vehicles is increasing. In order to share the existing fuel vehicle platform, the battery pack of the hybrid vehicle can only be arranged in the existing body. The space size is limited and more cells need to be arranged, which puts forward higher requirements for the volume utilization rate of the battery pack. Concepts such as no module and CTP emerge as the times require.

The Chinese patent application with the application number "CN201920056136.2" discloses a module-free battery pack, which has a battery pack sheet metal box and a number of series-connected cells placed inside the battery pack sheet metal box; the cells are in a rectangular array. It is arranged in the inner cavity of the battery pack sheet metal box, and is in contact with the inner wall of the battery pack sheet metal box. The tops of the cells arranged in the same row are pressed by the cell pressure bars; The grooves in the middle of the bracket are matched, and the cell pressure strip is fixed with the fixing screw and the pressure strip fixing base; the pressure strip fixing base and the battery pack sheet metal box are fixed by the mounting screws.

However, the above-mentioned non-module battery pack has the following defects:

(1) The bead is flat, the bearing capacity of the bead under the Z-direction (vertical direction) impact load is insufficient, and the deformation at the middle position is large.

(2) The rigid contact between the pressure strip and the cell is easy to cause damage to the shell of the cell, and the explosion-proof valve is pressed, which affects the safety of the cell.

(3) The X direction (the stacking direction of the battery cells) and the Y direction (the stacking direction of the battery cell modules) of the battery module are not fixed, and the battery module is easy to move in the battery pack, which affects the safety of the battery pack.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a battery pack and a vehicle in view of the problem of the existing non-module battery pack, the bead is flat, and the bearing capacity of the bead is insufficient under the Z-direction impact load.

In order to solve the above technical problems, on the one hand, an embodiment of the present invention provides a battery pack, including an upper cover, a tray, a bead, and a plurality of battery modules stacked along the Y direction, and the upper cover is connected to the tray to enclose it. A cavity for accommodating a plurality of the battery modules is formed, and both ends of the battery modules in the X direction are in contact with the inner wall of the tray to fix the plurality of battery modules in the X direction. The bottom surface of the battery module is in contact with the bottom plate of the tray, and the pressure strip is arranged between two adjacent battery modules in the Y direction;

The pressing strip includes a pressing plate and a vertical pressing rib connected to the bottom surface of the pressing plate, and the bottom surface of the pressing plate is pressed against the opposite side edges in the Y direction of the top surfaces of the two adjacent battery modules, so that the A plurality of the battery modules are fixed in the Z direction; both ends of the pressing plate in the X direction are fixed on the tray, and the vertical pressing ribs are inserted into the gap between two adjacent battery modules, The side surface of the battery module facing the vertical pressure rib is provided with elastic protrusions extending into the gap, the two sides of the vertical pressure rib in the Y direction and the elastic protrusions on both sides thereof abutting, so as to fix a plurality of the battery modules in the Y direction.

In an embodiment of the present application, the battery module includes a cell stack formed by stacking a plurality of cells in the X direction, and end plates pressed on both sides of the cell stack in the X direction. The side of the end plate facing away from the cell stack is fixed on the tray, and the side of the end plate facing the cell stack abuts the side of the cell stack in the X direction.

In an embodiment of the present application, the end plate includes an end plate body and an elastic member connected to a side of the end plate body away from the battery stack, the elastic member abuts against the inner wall of the tray , the side of the end plate body facing the cell stack abuts the side of the cell stack in the X direction.

In an embodiment of the present application, the elastic member includes two arched portions and a connecting portion connecting bottoms of the two arched portions, the connecting portion is attached to a portion of the end plate body facing away from the battery cell On one side surface of the stack, the top of the arch portion abuts on the inner wall of the tray.

In an embodiment of the present application, the battery module further includes side plates fixed on both sides of the cell stack in the Y direction, the side plates are provided with a plurality of the elastics arranged along the X direction bulge;

The top of the side plate is formed with a flange pressed against the top surface of the battery core toward the pole post of the battery core, and the bottom surface of the pressing plate is pressed on the flange.

In an embodiment of the present application, the pressure strip further includes a compressible spacer, and the compressible spacer is arranged in the Y direction between the bottom surface of the pressure plate and the top surfaces of the two adjacent battery modules. at the opposite side edge.

In an embodiment of the present application, the pressing bar further includes a connecting bar arranged on the top surface of the pressing plate, and the top surface of the connecting bar is in contact with the bottom surface of the upper cover; in the first mounting hole fixedly connected with the upper cover.

In an embodiment of the present application, the two ends of the pressing plate in the X direction protrude from the two ends of the connecting bar in the X direction, and the two ends of the pressing plate in the X direction are provided with a fixed connection to the tray. Second mounting hole.

In an embodiment of the present application, the tray is provided with a partition rib extending into the gap, the bottom of the partition rib is connected to the bottom plate of the tray, and the two sides of the partition rib in the X direction are connected to the bottom of the tray. The two side walls in the X direction of the tray are connected, and the separation rib divides the cavity into a plurality of sub-cavities, each of the battery modules is accommodated in the corresponding sub-cavity, and the top of the separation rib is connected to the sub-cavity. The bottoms of the vertical pressure ribs are spaced opposite to each other.

In an embodiment of the present application, the trays are stacked in multiple layers along the Z direction, each layer of the trays is provided with a plurality of the battery modules along the Y direction, and the upper cover is connected to the uppermost tray. Fixed connection, two adjacent layers of the trays, the bottom plate of the upper tray is fixed at the upper opening of the lower tray.

According to the battery pack of the embodiment of the present invention, both ends of the battery module in the X direction are in contact with the inner wall of the tray, so as to fix a plurality of the battery modules in the X direction. The pressing bar includes a pressing plate and a vertical pressing rib connected to the bottom surface of the pressing plate, and the bottom surface of the pressing plate is pressed against the opposite side edges in the Y direction of the top surfaces of the two adjacent battery modules, so The bottom surface of the battery module is in contact with the bottom plate of the tray, so as to fix a plurality of the battery modules in the Z direction. Both ends of the pressing plate in the X direction are fixed on the tray, the vertical pressing rib is inserted into the gap between the two adjacent battery modules, and the battery module faces the vertical pressing rib. One side surface of the rib is provided with elastic protrusions extending into the gap, and the two sides of the vertical pressing rib in the Y direction are in contact with the elastic protrusions on both sides, so as to fix a plurality of elastic protrusions in the Y direction. the battery module. In this way, the fixing (position limit) of the battery module in three directions is realized. In addition, the vertical beading improves the bending stiffness of the bead section, and can carry a larger impact load in the Z direction (due to the long length of the bead, the fixing points are at both ends of the bead in the X direction, and the middle deflection of the bead during loading bigger).

In addition, compared with the traditional module structure battery pack, the fixing position of the cell is moved from the end to the shoulder of the cell (the opposite side edges in the Y direction of the top surfaces of the two adjacent battery modules). ), which can provide more expansion space in the thickness direction of the cell, especially for cells with high energy density or silicon negative electrodes, which will experience relatively large expansion along the thickness direction (X direction) during the cycle.

In addition, compared with the conventional solution of fixing the battery module with side locking bolts, the present application requires less space in the width direction (Y direction) of the battery cells.

In addition, compared with the non-module battery pack solution bonded by structural adhesive, the present application uses mechanical connection without the assistance of structural adhesive, which is convenient for disassembly and maintenance, and can be repaired and replaced at the cell stack level.

On the other hand, an embodiment of the present invention provides a vehicle including the above-mentioned battery pack.

Description of drawings

1 is an exploded view of a battery pack provided by a first embodiment of the present invention;

FIG. 2 is a schematic diagram of a bead of a battery pack provided by the first embodiment of the present invention;

3 is a schematic diagram of a battery module of a battery pack provided by the first embodiment of the present invention;

4 is a schematic diagram of an elastic protrusion of a battery pack provided by the first embodiment of the present invention;

5 is a schematic diagram of a tray of a battery pack provided by the first embodiment of the present invention;

6 is a cross-sectional view along the Y direction of the battery pack provided by the first embodiment of the present invention;

Fig. 7 is an enlarged view at a place in Fig. 6;

8 is a cross-sectional view of the battery module of the battery pack provided by the first embodiment of the present invention;

Fig. 9 is an enlarged view at b in the figure;

FIG. 10 is a schematic structural diagram of a vehicle according to an embodiment of the present application.

The reference numbers in the description are as follows:

1. Top cover;

2. Tray; 21. Bottom plate; 22. Separation ribs; 23. Step surface;

3. Pressing strip; 31. Pressing plate; 311. Second mounting hole; 32. Vertical pressing bar; 33. Compressible gasket; 34. Connecting strip; 341. First mounting hole;

4. Battery module; 41. Cell; 42. End plate; 421, End plate body; 422, Elastic part; 4221, Arched part; , flanging;

5. Gap;

6. Bolts;

7. Vehicles;

8. Battery pack.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

Hereinafter, the X direction is the stacking direction of the battery cells (that is, the thickness direction of the battery cells), the Y direction is the width direction of the battery cells (that is, the stacking direction of the battery module), and the Z direction is the height direction of the battery module ( That is, the vertical direction of the vehicle), the specific orientation is shown by the arrow in FIG. 1 . Of course, this orientation is only for the convenience of description, and does not limit the orientation of the battery pack in specific applications.

first embodiment

As shown in FIG. 1 to FIG. 10 , the battery pack provided by the first embodiment of the present application includes an upper cover 1 , a tray 2 , a bead 3 and a plurality of battery modules 4 stacked along the Y direction. The upper cover 1 and the tray 2 are connected to form a cavity for accommodating a plurality of the battery modules 4, and both ends of the battery modules 4 in the X direction are in contact with the inner wall of the tray 2, so as to be fixed in the X direction. Each of the battery modules 4, the bottom surface of the battery module 4 is in contact with the bottom plate 21 of the tray 1, and the bead 3 is disposed between two adjacent battery modules in the Y direction.

The circumference of the upper cover 1 and the tray 2 (the uppermost tray) are connected by bolts.

The pressing bar 3 includes a pressing plate 31 and a vertical pressing rib 32 connected to the bottom surface of the pressing plate 31 . The bottom surface of the pressing plate 31 is pressed against the Y direction of the top surfaces of the two adjacent battery modules 4 . At the opposite side edges, a plurality of the battery modules 4 are fixed in the Z direction; the two ends of the pressing plate 31 in the X direction are fixed on the tray 2 , and the vertical pressing ribs 32 are inserted into the adjacent two The gap 5 between the battery modules 4, the side surface of the battery module 4 facing the vertical pressure rib 32 is provided with an elastic protrusion 431 extending into the gap 5, the vertical The two sides of the pressing rib 32 in the Y direction are in contact with the elastic protrusions 431 on both sides thereof, so as to fix the plurality of battery modules 4 in the Y direction.

The battery module 4 includes a cell stack formed by stacking a plurality of cells 41 in the X direction, and end plates 42 pressed against both sides of the cell stack in the X direction. One side of the cell stack is fixed on the tray 2 , and the side of the end plate 42 facing the cell stack abuts the side of the cell stack in the X direction.

The end plate 42 includes an end plate body 421 and an elastic member 422 connected to a side of the end plate body 421 away from the battery stack. The elastic member 422 is in contact with the inner wall of the tray 2 . The side of the end plate body 421 facing the cell stack abuts the side of the cell stack in the X direction.

In some embodiments of the present application, the elastic member 422 includes two arched portions 4221 and a connecting portion 4222 connecting the bottoms of the two arched portions 4221 , and the connecting portion 4222 is attached to the end plate body 421 The top of the arch portion 4221 abuts on the inner wall of the tray 2 on the side surface away from the cell stack.

The end plate 42 is fixed on the tray 2 by bolts perpendicular to the side wall of the tray 2. Through the action of the elastic member 422, there is a normal preload between the cell stack and the end plate 42, but the end plate 42 and the cell stack have a normal preload. Abutment only, no bonding or other connection.

The battery module 4 also includes side plates 43 fixed on both sides of the cell stack in the Y direction by structural adhesive, and the side plates 43 are provided with a plurality of the elastic protrusions 431 arranged along the X direction. ; The top of the side plate 43 is formed with a flange 432 pressed against the top surface of the battery core 41 toward the pole of the battery core 41 , and the bottom surface of the pressure plate 31 is pressed against the flange 432 superior. The function of the structural adhesive and the flanging 432 is to make the cell stack form a whole and improve the rigidity. In addition, the flanging 432 can also ensure that the tolerance in the height direction of the cell 41 is consistent, and the pre-tightening force in the Z direction of the bead can be evenly distributed. Each cell 41 .

The plurality of elastic protrusions 431 on the side plate 43 are obtained by punching, that is, a complete sheet metal is punched (punched out of the window), and the punched sheet-like part is suspended at the window to form the The elastic protrusion 431 is described. Preferably, the plurality of elastic protrusions 431 are arranged at equal intervals.

When the pressure bar 3 is inserted downward into the gap 5 in the Y direction between the two adjacent battery modules 4, the vertical pressure ribs 32 press the elastic protrusions 431 on both sides, and the elastic protrusions 431 are deformed under pressure, and provide preload, thereby fixing the battery module 4 in the Y direction.

The pressure strip 3 further includes a compressible spacer strip 33, and the compressible spacer strip 33 is cushioned at the opposite side edges in the Y direction between the bottom surface of the pressure plate 31 and the top surfaces of the two adjacent battery modules 4. . The bottom surface of the pressing plate 31 is divided into two crimping surfaces with the vertical pressing ribs 32 as the boundary. Between one of the crimping surfaces and the top surface of one of the battery modules 4 , the other compressible gasket 33 is cushioned between the other crimping surface and the top surface of the other battery module 4 .

In an embodiment of the present application, the initial uncompressed thickness of the compression pad 33 is 2-3 mm, and a preset compression amount provides Z-direction clamping force and absorbs Z-direction assembly tolerance. That is, in the present application, the bead 3 is integrated with the compressible gasket 33 to realize the soft connection with the battery module 4, and solve the problem of assembly tolerance.

In one embodiment of the present application, the compression pad 4 may be, for example, a foam pad.

As shown in FIG. 5 , the tray 2 is provided with a partition rib 22 extending into the gap 5 , the bottom of the partition rib 22 is connected to the bottom plate 21 of the tray 2 , and the two sides of the partition rib 22 in the X direction Connected with the two side walls in the X direction of the tray 2, the separating ribs 22 divide the cavity into a plurality of sub-cavities, each of the battery modules 4 is accommodated in the corresponding sub-cavities, and the The top of the separating rib 22 is spaced opposite to the bottom of the vertical pressing rib 32 .

On the one hand, the vertical bead 32 improves the bending stiffness of the bead section, and can carry a large impact load in the Z direction (due to the long length of the bead 3, the fixing points are at both ends of the pressure plate 31 in the X direction, and when the bead 31 is loaded, the fixed point is The middle deflection of the bead 3 is relatively large). On the other hand, the vertical pressing rib 32 and the separating rib 22 of the pallet 2 constitute a safety mechanism. When the load in the Z direction (downward) is large and the pressing bar 3 is severely bent, the bottom of the vertical pressing rib 32 will be in contact with the separating rib. The top of 22 is in rigid contact, and at this time, the gap between the bottom of the bead 3 and the top of the separation rib 22 is filled, so as to avoid failure of the aluminum shell of the battery cell 41 if the load exceeds the limit.

In the embodiment shown in FIG. 5 , there are two separating ribs 22 , and the two separating ribs 22 divide the cavity into three sub-cavities, so that three battery molds can be placed in each layer of tray 2 Group 4.

However, other numbers of separating ribs 22 may also be provided according to the number of battery modules 4 .

In some embodiments of the present application, the trays 2 are stacked in two layers along the Z direction, the upper cover 1 is fixedly connected to the uppermost tray 2 , and the bottom plate 21 of the upper tray 2 is fixed to the lower tray 2 . at the upper opening of the tray 2 .

The pressure strip 3 also includes a connecting strip 34 arranged on the top surface of the pressure plate 31 , and the pressure strip 3 in the upper tray 2 is provided with a first installation for fixed connection with the upper cover 1 on the connecting strip 34 . Hole 341. The top surface of the connecting bar 34 is used to support the upper cover 1 and is fixedly connected to the upper cover 1 by screwing the bolts 6 into the first mounting holes 341 . The top surface of the connecting bar 34 of the bead 3 in the lower tray 2 is used to support the bottom plate 21 of the upper tray 2 . For the bead 3 in the lower tray 2, the first mounting hole 341 on the top surface of the connection bar 34 can be eliminated, so as to simplify the structure of part of the bead 3 and reduce the cost. Preferably, the top surface of the connecting bar 34 is flat, so as to better support the upper cover 1 or the bottom plate 21 of the tray 2 .

Both ends of the pressing plate 31 in the X direction protrude from the two ends of the connecting bar 34 in the X direction, and the two ends of the pressing plate 31 in the X direction are provided with No. Two mounting holes 311 .

In this way, by using the bottom plate 21 of the upper tray 2 to fix the bead 3 of the lower tray 2, excellent structural strength can be obtained. In addition, the bead 3 on the upper layer provides more support points for the upper cover 1, and the upper cover 1 can bear a higher load. For example, in some SUV plug-in models, the upper cover 1 of the battery pack is the luggage compartment. In this way, the luggage can be subjected to higher loads.

The connecting bar 34 , the pressing plate 31 and the vertical pressing rib 32 are integrally formed to form the main body part of the beading bar.

However, it is also possible that the connecting bar 34, the pressing plate 31 and the vertical pressing rib 32 are respectively formed and then fixed into one body (welding, bolting, gluing, etc.).

In addition, the bead 3 can also be a sheet metal part or a die casting part.

In addition, the compressible spacer strip 33 can also be replaced by rubber or metal leaf springs. Alternatively, the compressible spacer strip 33 is directly integrated with the bead body portion or side panel 43, similar to the resilient protrusions 431 on the side panel 43.

As shown in FIG. 1 , a gap is formed between the two battery modules 4 on both sides in the Y direction and the inner wall of the tray 2 . Here, a pressure bar 3 can also be provided, and the vertical pressure ribs 32 of the pressure bar 3 are inserted into the battery mold. Gap between group 4 and the inner wall of tray 2. The difference from the pressure strip 3 between the two battery modules 4 is that, in the pressure strip 3 here, a piece of the compressible gasket 33 is cushioned between one of the crimping surfaces and the top surface of one of the battery modules 4 . , and the other compressible gasket 33 is arranged on another crimping surface and a stepped surface 23 (see FIG. 5 ) provided on the side wall of the tray 2 .

According to the battery pack of the first embodiment of the present application, both ends of the battery module 4 in the X direction are in contact with the inner wall of the tray 2 to fix a plurality of the battery modules 4 in the X direction. The pressing bar 3 includes a pressing plate 31 and a vertical pressing rib 32 connected to the bottom surface of the pressing plate 31 . The bottom surface of the pressing plate 31 is pressed against the Y direction of the top surfaces of the two adjacent battery modules 4 . At the opposite side edges, the bottom surface of the battery module 4 is in contact with the bottom plate of the tray 2 to fix a plurality of the battery modules 4 in the Z direction. Both ends of the pressing plate 31 in the X direction are fixed on the tray 2 , the vertical pressing ribs 32 are inserted into the gap between two adjacent battery modules 4 , and the direction of the battery modules 4 is One side surface of the vertical pressure rib 32 is provided with elastic protrusions extending into the gap, and the two sides of the vertical pressure rib 32 in the Y direction are in contact with the elastic protrusions on both sides to prevent A plurality of the battery modules 4 are fixed in the Y direction. In this way, the fixing (position limit) of the battery module 4 in three directions is realized. In addition, the vertical pressure rib 32 improves the bending stiffness of the bead section, and can bear a large impact load in the Z direction (due to the long length of the bead, the fixed points are at both ends of the pressure plate 31 in the X direction, and the bead's The middle deflection is relatively large).

In addition, compared with the traditional module structure battery pack, the fixing position of the bead to the cell is moved from the end to the shoulder of the cell (the opposite side in the Y direction of the top surfaces of the two adjacent battery modules 4). edge), more expansion space can be provided in the thickness direction of the cell, especially for cells with high energy density or silicon anodes, which will experience relatively large expansion along the thickness direction (X direction) during the cycle.

In addition, compared with the conventional solution of fixing the battery module 4 with side locking bolts, the present application requires less space in the width direction (Y direction) of the battery cells.

Second Embodiment (not shown)

The battery pack provided by the second embodiment of the present application is different from the first embodiment in that the tray 2 is provided with only one layer.

The third embodiment (not shown)

The battery pack provided by the third embodiment of the present application is different from the first embodiment in that the trays 2 are stacked in three layers along the Z direction, the upper cover is fixedly connected to the uppermost tray 2, and the adjacent There are two layers of the trays 2 , and the bottom plate of the upper tray 2 is fixed at the upper opening of the lower tray 2 . That is, from top to bottom, the upper cover is fixedly connected to the first layer tray 2, the bottom plate of the first layer tray 2 is fixed at the upper opening of the second layer tray 2, and the bottom plate of the second layer tray 2 is fixed to the third layer tray 2. The upper opening of the layer tray 2.

A plurality of battery modules 4 are arranged in each layer of trays 2 along the Y direction.

Fourth Embodiment

The battery pack provided by the fourth embodiment of the present application is different from the first embodiment in that the bottom surface of the upper cover is integrated with a bead. That is, the bead in the upper tray 2 is integrated with the upper cover to simplify the structure. The bead in the lower tray 2 can be integrated with the bottom plate of the upper tray 2 or be provided independently.

As shown in FIG. 10 , an embodiment of the present application provides a vehicle 7 including the battery pack 8 of the above embodiment.

The vehicle may be a hybrid vehicle or a pure electric vehicle.

The plug-in hybrid vehicles in hybrid vehicles share the platform of the fuel vehicle and the battery pack size is small, so they are often placed inside the vehicle, under the trunk or under the rear passenger seat. For mechanical protection, thermal insulation and other considerations, the battery pack will also be arranged in the body.

The above descriptions are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.

Claims

A battery pack, characterized in that it comprises an upper cover, a tray, a bead and a plurality of battery modules stacked along the Y direction, the upper cover and the tray are connected to enclose and form a plurality of battery modules for accommodating The two ends of the battery module in the X direction are in contact with the inner wall of the tray to fix a plurality of the battery modules in the X direction, and the bottom surface of the battery module and the bottom plate of the tray abutting, the bead is arranged between two adjacent battery modules in the Y direction;

The pressing bar includes a pressing plate and a vertical pressing rib connected to the bottom surface of the pressing plate, and the bottom surface of the pressing plate is pressed against the opposite side edges in the Y direction of the top surfaces of the two adjacent battery modules, so that the A plurality of the battery modules are fixed in the Z direction; both ends of the pressing plate in the X direction are fixed on the tray, and the vertical pressing ribs are inserted into the gap between two adjacent battery modules, The side surface of the battery module facing the vertical pressure rib is provided with elastic protrusions extending into the gap, the two sides of the vertical pressure rib in the Y direction and the elastic protrusions on both sides thereof come into contact to fix a plurality of the battery modules in the Y direction.
The battery pack according to claim 1, wherein the battery module comprises a cell stack formed by stacking a plurality of cells in the X direction, and a cell stack pressed on both sides of the cell stack in the X direction. an end plate, the side of the end plate facing away from the cell stack is fixed on the tray, the side of the end plate facing the cell stack and the side of the cell stack in the X direction against.
The battery pack according to claim 1 or 2, wherein the end plate comprises an end plate body and an elastic member connected to a side of the end plate body away from the battery stack, and the elastic member is connected to the end plate body. The inner wall of the tray abuts, and the side of the end plate body facing the cell stack abuts the side of the cell stack in the X direction.
The battery pack according to claim 3, wherein the elastic member comprises two arched parts and a connecting part connecting the bottoms of the two arched parts, the connecting part is attached to the end plate body The top of the arch portion abuts on the inner wall of the tray on a surface of one side facing away from the cell stack.
The battery pack according to any one of claims 1-4, wherein the battery module further comprises side plates fixed on both sides of the cell stack in the Y direction, and the side plates are provided with a plurality of the elastic protrusions.
The battery pack according to claim 5, wherein the elastic protrusions are arranged at intervals on the side plates and are arranged at intervals in the X direction.
The battery pack according to claim 6, wherein a plurality of the elastic protrusions are punched and formed on the side plate.
The battery pack according to claims 5-7, wherein a top of the side plate is formed with a flange pressed against the top surface of the battery core toward the pole of the battery core, and the pressure plate The bottom surface is pressed against the flange.
The battery pack according to any one of claims 1-8, wherein the pressing strip further comprises a compressible gasket, and the compressible gasket is arranged on the bottom surface of the pressing plate and two adjacent ones at the opposite side edges in the Y direction of the top surface of the battery module.
The battery pack according to claim 9, wherein the bottom surface of the pressing plate is divided into two pressing surfaces with the vertical pressing rib as a boundary, and the compressible spacers are two and are correspondingly arranged with on the crimping surface.
The battery pack according to any one of claims 1-10, wherein the pressing bar further comprises a connecting bar arranged on the top surface of the pressing plate, and the top surface of the connecting bar is connected to the top surface of the upper cover. Bottom surface fit.
The battery pack according to claim 9, wherein the connecting bar is provided with a first mounting hole for fixedly connecting with the upper cover.
The battery pack according to claims 11-12, wherein both ends of the pressing plate in the X direction protrude from the two ends of the connecting bar in the X direction, and both ends of the pressing plate in the X direction are provided with a second mounting hole fixedly connected with the tray.
The battery pack according to any one of claims 1-13, wherein the tray is provided with a separation rib extending into the gap, and the bottom of the separation rib is connected to the bottom plate of the tray, so The two sides in the X direction of the separating rib are connected with the two side walls in the X direction of the tray, and the separating rib divides the cavity into a plurality of sub-cavities, and each of the battery modules is accommodated in the corresponding In the sub-cavity, the top of the separating rib is spaced opposite to the bottom of the vertical pressing rib.
The battery pack according to any one of claims 1-14, wherein the tray is stacked in multiple layers along the Z direction, the upper cover is fixedly connected to the uppermost tray, and two adjacent layers are In the tray, the bottom plate of the upper tray is fixed at the upper opening of the lower tray.
The battery pack according to claim 15, wherein a plurality of the battery modules are arranged in the Y direction in each layer of the tray.
The battery pack according to claim 15, wherein the connecting bar of the pressing bar located in the uppermost tray is in contact with the bottom surface of the upper cover, and the connecting strip located in the tray under the uppermost tray is in contact with the bottom surface of the upper cover. The connecting bar of the pressing bar is in abutment with the bottom plate of the adjacent upper layer of the tray.
The battery pack according to claim 9, wherein the compressible gasket is configured as a rubber piece or a metal piece.
The battery pack according to claim 9, wherein an initial uncompressed thickness of the compressible gasket is 2mm-3mm.
A vehicle, characterized by comprising the battery pack according to any one of claims 1-19.