CN218867257U

CN218867257U - Battery device

Info

Publication number: CN218867257U
Application number: CN202223590875.0U
Authority: CN
Inventors: 郑立成; 李炜; 石腾腾; 李菲
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-04-14
Anticipated expiration: 2032-12-29

Abstract

The application relates to a battery device, which relates to the technical field of batteries and comprises a battery pack formed by stacking a plurality of batteries, a box body and a pressing mechanism; wherein the battery pack is positioned in the inner cavity of the box body; the pressing mechanism comprises an end plate, a connecting piece and a pressing strip; wherein the end plate is fixed to at least one end of the battery pack along a first direction, the first direction being a stacking direction of the plurality of cells; the pressing strip is pressed against the surface of the battery pack, which is back to the bottom wall of the box body, so that the battery pack is tightly pressed in the box body; one end of the pressing strip is connected with the end plate through the connecting piece, the connecting piece is fixed to the end plate, and the connecting piece is movable in a set range along the first direction at the connecting position of the pressing strip. Through the removal of the hookup location of connecting piece and layering, this application has the effect of providing the buffering when expanding for the group battery.

Description

Battery device

Technical Field

The present application relates to the field of battery technology, and more particularly, to a battery device.

Background

The battery device is a battery system which performs overall control through a battery management system after a plurality of batteries in a battery box are connected in series or in parallel and performs capacity exchange with external equipment.

In the process of cyclic charge and discharge of the battery device, the battery expands, the pressing force between a fixing piece for fixing the battery in the battery device and the battery is increased after the battery expands, and the stress applied to the battery in an expansion area is more concentrated, so that the cyclic performance of the battery is reduced.

SUMMERY OF THE UTILITY MODEL

The application provides a battery device, can provide the buffering for the inflation of battery during operation.

The application provides a battery device, which comprises a battery pack formed by stacking a plurality of batteries, a box body and a pressing mechanism; wherein the battery pack is positioned in the inner cavity of the box body; the pressing mechanism comprises an end plate, a connecting piece and a pressing strip; wherein the end plate is fixed to at least one end of the battery pack along a first direction, the first direction being a stacking direction of the plurality of cells; the pressing strip is pressed against the surface of the battery pack, which is back to the bottom wall of the box body, so that the battery pack is tightly pressed in the box body; one end of the pressing strip is connected with the end plate through the connecting piece, the connecting piece is fixed to the end plate, and the connecting piece is movable in a set range along the first direction at the connecting position of the pressing strip.

In the technical scheme, the battery pack is tightly pressed by using the end plate, the battery pack is tightly pressed in the box body by the pressing strip, and the battery pack is fixed in the box body by the pressing mechanism; when the battery device is charged and discharged, the battery expands, the battery pack expands along the first direction, the pressing force between the battery pack and the end plate is increased, and the connecting position of the pressing strip and the connecting piece can move along the first direction, so that the connecting piece and the end plate can synchronously move along the first direction, the pressure between the battery pack and the end plate is reduced, the stress concentration applied to the expansion area when the battery pack is used is reduced, and the cycle performance of the battery is improved.

Drawings

FIG. 1 is a schematic structural view of a battery device according to an embodiment;

FIG. 2 is a schematic structural view illustrating a pressing bar pressing the battery pack in the case according to an embodiment;

FIG. 3 is a schematic view of a connection of a bead to a first end plate and a second end plate according to one embodiment;

FIG. 4 is a schematic view of a connection of a bead to a first end plate according to one embodiment;

FIG. 5 is a schematic view of a bead and bolt connection structure according to an embodiment.

1. A first end plate; 2. a second end plate; 3. layering; 31. avoiding a space; 32. a transverse plate; 33. a vertical plate; 34. flanging; 35. reinforcing ribs; 4. a box body; 5. a battery pack; 6. a connecting member.

Detailed Description

The present application is described in further detail below with reference to the figures and examples. The features and advantages of the present application will become more apparent from the description.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not conflict with each other.

The embodiment of the application discloses a battery device. Referring to fig. 1, the battery pack protection device comprises a box body 4, wherein a battery pack 5 is arranged in the box body 4, the box body 4 provides support protection for the battery pack 5, and conductive connection between the battery pack 5 and external equipment is realized.

The box 4 comprises a lower box body and an upper box cover, the upper box cover is buckled on a box opening of the lower box body, and the upper box cover and the lower box body are fixedly connected through bolts in a detachable mode to form an inner cavity for accommodating the battery pack 5.

Referring to fig. 2, the battery pack 5 includes a plurality of rectangular parallelepiped cells that are stacked in order in the thickness direction and then connected in series or in parallel with each other.

For convenience of description, a first direction, a second direction, and a third direction are defined, wherein the first direction is a thickness direction of the battery, which is also a stacking direction of the plurality of batteries in the battery pack 5, and is denoted as a y-direction in the drawings; the second direction is the length direction of the battery, which is shown as the x direction in the drawing; the third direction is the width direction of the cell, denoted as the z-direction in the drawing.

Referring to fig. 2 and 3, the battery device further includes a pressing mechanism including an end plate, a connecting member 6, and a pressing bar 3; the end plate and at least one end of the battery pack 5 along the first direction are pressed and fixed, and the end plate and the end of the battery pack 5 along the first direction are pressed.

The pressing strip 3 is pressed against the surface of the battery pack 5, which is back to the bottom wall of the box body 4, so that the battery pack 5 is pressed in the box body 4; one end of the pressing strip 3 is connected with the end plate through a connecting piece 6, the connecting piece 6 is fixed with the end plate, and the connecting position of the connecting piece 6 and the pressing strip 3 can move within a set range along a first direction.

Referring to fig. 2, the end plate is press-fixed to at least one end of the battery pack 5 in the first direction. In the embodiment, the number of the end plates is two, the two end plates are respectively pressed with two ends of the battery pack 5 along the first direction, two ends of the pressing strips 3 along the first direction are respectively and fixedly connected with the two end plates in a one-to-one correspondence manner, wherein at least one end of the pressing strip 3 is connected with the corresponding end plate through a connecting piece 6;

illustratively, one end of the batten 3 is connected with the end plate through a connecting piece 6, and the other end of the batten 3 is connected with the end plate through a bolt. Optionally, both ends of the pressing bar 3 are connected with the two end plates through the connecting pieces 6 respectively.

In another embodiment, the end plate has one end plate, the end plate and the side wall of the box body 4 are respectively pressed against two ends of the battery pack 5 along the first direction, one end of the pressing strip 3 along the first direction is connected with the end plate through a connecting piece 6, and the other end is fixedly connected with the side wall of the box body 4.

In the present embodiment, the two end plates are a first end plate 1 and a second end plate 2, respectively. The first end plate 1 and the second end plate 2 are correspondingly pressed and fixed with two ends of the battery pack 5 along a first direction. The first end plate 1 is fixed at the front end of the box body 4, the length of the first end plate 1 is arranged along the second direction, the second end plate 2 is fixed at the rear end of the box body 4, the first end plate 1 is connected with the pressing strip 3 through the connecting piece 6, and the second end plate 2 is fixedly connected with the pressing strip 3 through the bolt.

Specifically, first end plate 1 is the rectangular plate of length along the second direction, and first end plate 1 is along the both ends difference fixedly connected with angle steel of second direction, the fixed connection of two relative lateral walls one-to-one of two angle steels and box 4.

The second end plate 2 is provided with a plurality of second direction interval settings, and is exemplary, second end plate 2 is provided with two, and two second end plates 2 are square board, and two second end plates 2 and box 4 are along the lateral wall fixed connection of the rear end of second direction. Alternatively, the second end plates 2 are provided at intervals of one, three or another number in the second direction.

During the installation, second end plate 2 is fixed with box 4, and in box 4 was put into to group battery 5, supported first end plate 1 and the end plate of group battery 5 and pressed, used the bolt fixed with the angle steel on first end plate 1 and the box 4 for first end plate 1 and second end plate 2 compress tightly fixedly with the both ends one-to-one of group battery 5 respectively.

Since the plurality of cells in the cell group 5 are stacked in the first direction, the cells may expand during charging and discharging of the cells, wherein the expansion is the largest at the middle of the cells, and the cells expand, and the cell group 5 formed by stacking the plurality of cells in the first direction may expand in the first direction, so that the first end plate 1 may be bent and deformed in the second direction, wherein the middle of the first end plate 1 in the length direction is deformed the largest, and the deformation gradually decreases from the middle to both ends in the length direction.

Referring to fig. 2, the pressing bars 3 are pressed against the surface of the battery pack facing away from the bottom wall of the case, and the stacked battery packs 5 are pressed in the case 4 by the pressing bars.

Referring to fig. 3, the batten 3 is exemplarily a U-shaped batten opening to the bottom wall of the box 4, the batten 3 includes a transverse plate 32 and two vertical plates 33, the transverse plate 32 is located between the two vertical plates 33, and the transverse plate 32 is fixedly connected to the same ends of the two vertical plates 33.

Referring to fig. 4, in an exemplary embodiment, one end of each of the two vertical plates 33, which is far away from the transverse plate 32, is fixedly connected to the first end plate 1 and the second end plate 2 through the connecting members 6 in a one-to-one correspondence. The transverse plate 32 is abutted against the surface of the bottom wall of the box body, which is opposite to the battery pack 5, so that the battery pack 5 is pressed in the box body 4, and the limitation and fixation of the battery pack along the third direction are realized.

Illustratively, the vertical plate 33 and the second end plate 2 are fixed by bolts, and optionally, the vertical plate and the second end plate are fixed by riveting or welding.

Referring to fig. 5, as an alternative, the bead 3 further includes a flange 34, the flange 34 is fixed to the end of the vertical plate 33 connected to the first end plate 1, and the connecting member is connected to the flange.

Specifically, the beads 34 are provided only on the riser 33 connected to the first end plate 1. Optionally, there are two flanges 34, and the two flanges 34 are respectively disposed on the two vertical plates 33 in a one-to-one correspondence manner.

The flanges 34 are extensions of the vertical plates 33 in the first direction, and the flanges 34 facilitate connection between the bead 3 and the first end plate 1.

In the present embodiment, the batten 3 is integrally formed by bending a strip steel plate, and in another embodiment, the transverse plate 32, the vertical plate 33 and the turned edge 34 can be welded or fixedly connected by bolts. The structure is kept stable after the molding of the pressing strip 3.

Referring to fig. 5, one end of the compression strip 3 is connected with the end plate through a connecting piece 6, the connecting piece 6 is fixed with the end plate, and the connecting position of the connecting piece 6 and the compression strip 3 is movable within a set range along a first direction.

When the battery pack 5 expands to drive the end plate to bend and deform, the connecting piece 6 moves synchronously with the deformation of the end plate because the connecting piece 6 is fixed on the end plate. The connecting position of the connecting piece 6 and the pressing strip 3 is fixed, and the pressing strip 3 blocks the connecting piece 6 from moving along with the end plate, so that the deformation of the end plate is blocked; in the scheme, the connecting position of the connecting piece 6 and the pressing strip 3 can be moved along the first direction, and when the connecting piece 6 is connected with the pressing strip 3, the connecting piece 6 can still move along the first direction within a set range along with the end plate, so that the end plate can move for a certain distance along the first direction, partial pressure between the end plate and the battery pack 5 is released, the pressure of the end plate on the battery is reduced, the stress concentration of the battery pack 5 in an expansion part is reduced, and the circular discharge capacity of the battery is improved.

Referring to fig. 5, as an alternative, an avoidance space 31 is provided on the bead 3; the connecting member 6 includes a rod member, the rod member passes through the avoiding space 31 to be fixed with the first end plate 1, and the rod member is movable within a set range in the avoiding space 31 along a first direction and a direction away from the battery pack 5.

The escape space 31 is, for example, a recess provided in the bead 3. In another embodiment, the avoiding space 31 is an elongated hole formed in the bead 3, and the connecting member 6 is spaced apart from the side surface of the elongated hole away from the battery pack 5.

Specifically, one end of the turned edge 34, which faces away from the vertical plate 33 in the first direction, is provided with a notch, the notch is in a U shape with an opening facing away from the battery pack 5, the two notches are in one-to-one correspondence with the connecting pieces 6, and the two notches are arranged at intervals in the second direction.

The notch is arranged, so that the connecting piece 6 can conveniently pass through; and during installation, a larger assembly gap is allowed between the connecting piece 6 and the pressing strip 3 along the first direction, so that the installation connection between the pressing strip 3 and the end plate is convenient.

Because the rod piece in the scheme penetrates through the avoidance space 31 and can move in the avoidance space 31 along the first direction, and the notch is arranged, when the connecting piece 6 moves along the first direction along with the deformation of the end plate, the connecting piece 6 moves in the notch; compared with the round hole which is only arranged on the flanging 34 and used for accommodating the rod piece to pass through, when the rod piece has the tendency of moving along the first direction along with the deformation of the end plate, the rod piece is pressed against the flanging 34, the flanging 34 blocks the rod piece from moving, and further blocks the deformation of the end plate; in this embodiment, since the end plates are deformable and movable, partial pressure can be released when the battery pack 5 expands, reducing stress inside the battery.

The setting range can be determined according to design requirements, and the numerical value of the setting range can be determined by various factors such as battery packs with different sizes and specifications, battery packs with different models, maximum allowable bending deformation of end plates and the like.

Referring to fig. 5, as an alternative, the connecting member 6 is a bolt threaded with the first end plate 1 through the relief space 31, and the bolt presses the compression strip 3 and the first end plate 1 under a set pressure.

When the installation is carried out, the bolt is locked according to the set torque by using a torque wrench, so that the pressure between the pressing strip 3 and the first end plate 1 is the set pressure, and when the acting force between the bolt and the pressing strip 3 along the first direction is greater than the frictional resistance between the bolt and the pressing strip 3 due to the pressure, the pressing strip 3 can move along the first direction relative to the bolt and the first end plate 1.

Referring to fig. 4, as an alternative, the risers 33 have a height less than half the height of the battery pack 5, the height direction being perpendicular to the first direction.

Specifically, the height direction is the third direction in the present embodiment. The dimension of the first end plate 1 and the second end plate 2 in the third direction is greater than half the height of the battery pack 5. 4 diapalls of box are put to group battery 5, and 4 diapalls of box are put to the one end of first end plate 1 along the third direction, riser 33 and first end plate 1 and second end plate 2 fixed connection.

The connection position of the vertical plate 33 to the first end plate 1 and the second end plate 2 is above half of the height of the battery pack 5, and the upper end surfaces of the first end plate 1 and the second end plate 2 are located above the center of the height of the battery pack 5. For first end plate 1 and second end plate 2 up end be located the centre below of group battery 5 height, the hookup location of first end plate 1 and second end plate 2 and group battery 5 in this embodiment can provide more stable the support that compresses tightly to the battery, improves the stability that first end plate 1 and second end plate 2 and group battery 5 compressed tightly.

In another embodiment, when the connecting member is disposed between the vertical plate 33 and the first end plate 1 and the second end plate 2 or the first end plate 1 and the second end plate 2 are spaced from the bottom wall of the box 4, the center of gravity of the battery is along

The projection of the first direction is located on the first end plate 1, and the projection of the center of gravity of the battery along the first direction is located on the second end plate 5, so that the first end plate 1 and the second end plate 2 are kept stably pressed on the battery pack 5.

Referring to fig. 4, as an alternative, the bead 3 is provided with a rib 35, and the rib 35 is provided on the horizontal plate 32 and the vertical plate 33 provided with the bead 34. In another embodiment, the stiffener 35 is provided on both the cross plate 32 and the two risers 33.

The ribs 35 are protrusions formed by pressing on the surfaces of the horizontal plate 32 and the vertical plate 33, respectively, and the ribs 0 can improve the resistance of the horizontal plate 32 and the vertical plate 33 against bending deformation. In another embodiment, the reinforcement is

The ribs 35 are columnar protrusions welded to the horizontal plate 32 and the vertical plate 33 on the surface facing away from the battery pack 5.

Furthermore, reinforcing ribs are welded at the turning positions of the vertical plates 33 and the transverse plates 32, and the reinforcing ribs keep the stability of the vertical plates 33 and the transverse plates 32 after being bent, so that the shape of the batten 3 is kept, and the batten 3 is slowed down to press the battery pack

5 after both ends in the first direction.

5 referring to fig. 3, as an alternative, the beads 3 are provided in plurality at intervals in the second direction.

Illustratively, two pressing strips 3 are arranged, the two pressing strips 3 are arranged at intervals along the second direction, and the two pressing strips 3 simultaneously press against the end part of the battery pack 5, so that the acting force borne by a single pressing strip 3 can be reduced, and the size change of the battery pack 5 along the first direction can be reduced. When a single bead 3 fails, the other bead 3 can still hold both ends of the battery pack 5 in compression.

0 in other embodiments, the beads 3 are spaced three, four or another number in the second direction.

Referring to fig. 3, as an alternative, N number of beads 3 are provided, and the N number of beads 3 are respectively located at N +1 equally divided points of the battery in the second direction.

When the bead 3 is provided with one, the bead 3 is located at a bisector point of the battery in the second direction. When the pressing strips 3 are provided with two pressing strips 5, the two pressing strips 3 are respectively positioned at the trisection points of the battery along the second direction one by one.

When three pressing strips 3 are arranged, the three pressing strips 3 are respectively positioned at the quartering points of the battery along the second direction one by one.

The arrangement of the pressing strips enables the acting force exerted by the single pressing strip 3 on the battery pack 5 to be relatively balanced, and the size change of the battery pack 5 along the first direction can be reduced.

In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on operational states of the present application, and are only used for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise explicitly stated or limited. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The present application has been described above in connection with preferred embodiments, which are intended to be exemplary only and illustrative only. On the basis of the above, the present application can be subjected to various substitutions and modifications, which are all within the scope of protection of the present application.

Claims

1. A battery device is characterized by comprising a battery pack formed by stacking a plurality of batteries, a box body and a pressing mechanism; wherein the content of the first and second substances,

the battery pack is positioned in the inner cavity of the box body;

the pressing mechanism comprises an end plate, a pressing bar and a connecting piece; wherein the content of the first and second substances,

the end plate and at least one end of the battery pack along a first direction are pressed and fixed, and the first direction is the stacking direction of the plurality of batteries;

the pressing strip is pressed against the surface of the battery pack, which is back to the bottom wall of the box body, so that the battery pack is tightly pressed in the box body; wherein the content of the first and second substances,

one end of the pressing strip is connected with the end plate through the connecting piece, the connecting piece is fixed with the end plate, and the connecting piece is movable in a set range along the first direction.

2. The battery device according to claim 1, wherein an avoidance space is provided on the bead;

the connecting piece includes the member, the member passes dodge the space with the end plate is fixed, just the member is in dodge the space in follow first direction just keeps away from the group battery direction is portable at the settlement within range.

3. The battery device according to claim 2, wherein the connecting member is a bolt which penetrates through the avoiding space and is in threaded connection with the end plate, and the bolt presses the pressing strip and the end plate under a set pressure.

4. The battery device of claim 2, wherein the avoiding space is a notch disposed at an end of the bead away from the battery pack in the first direction.

5. The battery device according to any one of claims 1 to 4, wherein the end plates include a first end plate and a second end plate, the first end plate and the second end plate respectively abut against two ends of the battery pack along the first direction, the first end plate is connected with the pressing strip through the connecting member, and the second end plate is fixedly connected with the pressing strip.

6. The battery device of claim 5, wherein the bead comprises a cross plate and two risers; wherein the content of the first and second substances,

the transverse plate is positioned between the two vertical plates and is fixedly connected with the same end of the two vertical plates;

two the riser respectively one-to-one with first end plate pass through connecting piece fixed connection, with second end plate fixed connection.

7. The battery device of claim 6, wherein the riser height is less than half of the cell group height, the direction of the height being perpendicular to the first direction.

8. The battery device of claim 6, wherein the bead further comprises a flange fixed to an end of the riser connected to the first end plate, and the connecting member is connected to the flange.

9. The battery device of claim 1, wherein the beads are spaced apart in a second direction, the second direction being a length direction of the end plates.

10. The battery device according to claim 9, wherein the pressing bar is provided in N number, and the N number of pressing bars are respectively located at N +1 equally divided points of the battery in the second direction.