CN115954597A

CN115954597A - Battery pack, vehicle and manufacturing method of battery pack

Info

Publication number: CN115954597A
Application number: CN202211626230.XA
Authority: CN
Inventors: 温盛德
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-12-15
Filing date: 2022-12-15
Publication date: 2023-04-11

Abstract

The invention discloses a battery pack, a vehicle and a manufacturing method of the battery pack, and belongs to the technical field of batteries. The battery pack comprises a housing assembly, a built-in box body arranged in the housing assembly, a connecting assembly and a plurality of battery cell blocks, wherein the housing assembly comprises an upper shell and a lower shell, the connecting assembly is connected with the built-in box body and the lower shell, the built-in box body is provided with a plurality of cavities, and the battery cell blocks are respectively contained in the cavities. The battery core is directly arranged in the built-in box body, a module structure is omitted, the welding step in the traditional structure is avoided, the production beat is accelerated, the production efficiency is improved, and the capacity requirement is met. And a module production line is not required to be put into operation, so that the cost is saved. Built-in box and shell subassembly pass through coupling assembling to be connected, later through coupling assembling equipment, have improved the connection reliability. The built-in box body and the shell assembly are fed respectively, so that the structure is prevented from being too complex, the production difficulty is reduced, and the structural reliability is improved.

Description

Battery pack, vehicle and manufacturing method of battery pack

Technical Field

The invention relates to the technical field of batteries, in particular to a battery pack, a vehicle and a manufacturing method of the battery pack.

Background

The battery package includes the box and locates a plurality of battery modules in the box, falls into two assembly lines during the equipment and assembles, module assembly line and battery package assembly line promptly, and the battery module includes electric core, end plate and curb plate, during the equipment, places electric core between end, curb plate, again with end, curb plate welding formation battery module, later pack the battery module into the box again. However, the battery pack needs to be put into two production lines and welding equipment is arranged, so that the cost is increased, the steps are complicated, the production efficiency is low, and the production requirement is difficult to meet.

Disclosure of Invention

The invention aims to provide a battery pack, a vehicle and a manufacturing method of the battery pack, which can reduce the cost and improve the production efficiency.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, a battery pack is provided, which includes a housing assembly, and a built-in box, a connecting assembly and a plurality of battery cell blocks arranged in the housing assembly, wherein the housing assembly includes an upper shell and a lower shell, the connecting assembly connects the built-in box and the lower shell, the built-in box is provided with a plurality of cavities, and the plurality of battery cell blocks are respectively accommodated in the plurality of cavities.

In some possible embodiments, the electric core block further comprises a liquid cooling plate, and the liquid cooling plate is arranged on one side, facing the upper shell, of the upper end of the electric core block.

In some possible embodiments, the cell block includes a plurality of cells, the plurality of cells are arranged in a thickness direction, and one side of each of the plurality of cells in a width direction faces the liquid cooling plate.

In some possible embodiments, the liquid cooling plate is connected to the built-in box body through a waterproof rivet nut, and the upper shell is connected to the waterproof rivet nut.

In some possible embodiments, a structural adhesive layer is arranged between the electric core block and the bottom plate of the built-in box body; and/or a structural adhesive layer is arranged between the electric core block and the liquid cooling plate.

In some possible embodiments, the plurality of cell blocks are divided into two parts, the plurality of cell blocks of each part are respectively connected in series, the first part of the cell block is provided with two first electrode connecting ends, the second part of the cell block is provided with two second electrode connecting ends, and one first electrode connecting end and one second electrode connecting end can be electrically connected.

In some possible embodiments, a sealant layer is disposed between the upper case and the lower case.

In some possible embodiments, the housing assembly is made of sheet metal.

In some possible embodiments, the built-in box body comprises an outer frame, a bottom plate and a middle beam, the outer frame and the bottom plate are connected to form an accommodating cavity, and the middle beam is arranged in the accommodating cavity and divides the accommodating cavity into a plurality of cavities.

In some possible embodiments, the cell block includes a plurality of cells, positive electrodes and negative electrodes of the cells are located on sides along a length direction, the plurality of cells are arranged along a thickness direction, the side of the cell block along the length direction of the cells is provided with a bar, and the plurality of cells are connected through the bar.

In some possible embodiments, the connection assembly includes:

the built-in box body is bonded to the lower shell through the bonding structure; and/or

And the built-in box body is connected to the lower shell through the fastener.

In some possible embodiments, the housing assembly further comprises a sheet metal panel connected to the upper housing.

In some possible embodiments, the lower shell is provided with a mounting beam to which the built-in box is attached.

In some possible embodiments, the temperature detection device is further included, and the temperature detection device is arranged between the built-in box body and the electric core block.

In a second aspect, a vehicle is provided, which includes the battery pack.

In a third aspect, a method for manufacturing a battery pack is provided, for manufacturing the battery pack, and includes the following steps:

respectively loading a plurality of battery cell blocks into a plurality of cavities of the built-in box body;

the built-in box body is arranged in the lower shell;

and connecting the upper shell with the lower shell.

The invention has the beneficial effects that:

according to the battery pack, the vehicle and the manufacturing method of the battery pack, provided by the invention, the battery core is directly arranged in the built-in box body, a module structure is omitted, steps such as welding in a traditional structure are avoided, the production beat is accelerated, the production efficiency is improved, and the capacity requirement is met. And a module production line is not required to be put into, end and side plate welding equipment is avoided, and the cost is saved. Built-in box and shell subassembly pass through coupling assembling to be connected, later assemble through coupling assembling, have improved the connection reliability. The built-in box body and the shell assembly are fed respectively, so that the structure is prevented from being too complex, the production difficulty is reduced, and the structural reliability is improved.

Drawings

Fig. 1 is an exploded view of a battery pack according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a cell block provided in a lower case and an internal box according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a first voltage operation mode of a battery pack according to an embodiment of the invention;

fig. 4 is a schematic diagram of a second voltage operation mode of the battery pack according to the embodiment of the invention;

fig. 5 is a schematic diagram of a third voltage operation mode of the battery pack according to the embodiment of the invention.

In the figure:

1. a housing assembly; 11. an upper shell; 12. a lower case; 121. mounting a beam; 13. a sheet metal panel; 14. buffering cotton; 15. a mounting seat; 16. a glue ring;

2. a box body is arranged inside; 21. an outer frame; 22. a base plate; 221. a glue tank; 23. a center sill; 2A, a cavity;

3. a connection assembly;

4. an electric core block; 41. a first electrode connecting end; 42. a second electrode connection end;

5. a liquid cooling plate; 6. waterproof rivet nuts; 7. a structural adhesive layer; 8. copper bars are arranged.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The embodiment provides a battery pack, as shown in fig. 1 and 2, the battery pack includes a housing assembly 1, a built-in box body 2 arranged in the housing assembly 1, a connecting assembly 3 and a plurality of electrical core blocks 4, the housing assembly 1 includes an upper shell 11 and a lower shell 12, the connecting assembly 3 connects the built-in box body 2 and the lower shell 12, the built-in box body 2 is provided with a plurality of cavities 2A, and the electrical core blocks 4 are respectively accommodated in the cavities 2A.

The battery core is directly installed in the built-in box body 2, a module structure is cancelled, the welding step in the traditional structure is avoided, the production beat is accelerated, the production efficiency is improved, and the capacity requirement is met. The production line of the module is not required to be put into, end and side plate welding equipment is avoided, and the cost is saved. Built-in box 2 and shell subassembly 1 are connected through coupling assembling 3, later assemble through coupling assembling 3, have improved the connection reliability. Built-in box 2 and shell subassembly 1 come the material respectively, avoid the structure too complicated, have reduced the production degree of difficulty, have improved structural reliability.

The built-in casing 2 and the housing assembly 1 may be provided by different suppliers, respectively. In an embodiment, the housing assembly 1 is made of sheet metal, and the housing assembly 1 may be provided by a supplier who specializes in making sheet metal boxes. In one embodiment, the built-in box body 2 comprises an outer frame 21, a bottom plate 22 and a middle beam 23, the outer frame 21 and the bottom plate 22 are connected to form a containing cavity, the middle beam 23 is arranged in the containing cavity and divides the containing cavity into a plurality of cavities 2A, the outer frame 21 and the middle beam 23 can be of an aluminum profile structure, the three are fixed in a welding mode and the like, and the aluminum profile structure can be provided by an aluminum profile supplier.

In one embodiment, as shown in fig. 1, the battery pack further includes a liquid cooling plate 5, the liquid cooling plate 5 is disposed on one side of the upper end of the electrical core block 4 facing the upper case 11, so as to prevent the bottom of the battery pack from being hit by a ball, which results in the rejection of the liquid cooling plate 5, and improve the reliability of the product. In an embodiment, the battery pack further comprises a waterproof rivet nut 6, the waterproof rivet nut 6 is connected with the liquid cooling plate 5 and the built-in box body 2, the phenomenon that condensed water stretches into the battery from a mounting hole in the top of the liquid cooling plate 5 is avoided, the upper shell 11 is connected to the waterproof rivet nut 6, and the waterproof rivet nut 6 provides a mounting position for the upper shell 11 and is convenient to assemble.

In an embodiment, as shown in fig. 1, a structural adhesive layer 7 is disposed between the battery cell block 4 and the bottom plate 22 of the internal box 2, and a structural adhesive layer 7 is disposed between the battery cell block 4 and the liquid cooling plate 5, so that the battery cell block 4 is reliably bonded to the liquid cooling plate 5 and the internal box 2 through the structural adhesive layer 7, and the battery cell block 4 is prevented from shaking. Further, a glue groove 221 is provided on the bottom plate 22 for filling and containing glue to form the structural glue layer 7. In one embodiment, the battery pack further comprises a temperature detection piece, and the temperature detection piece is arranged between the built-in box body 2 and the electric core block 4 and used for detecting the temperature of the electric core block 4 to avoid causing fire. During the equipment, at first with the coating of structure glue on the bottom plate 22 of built-in box 2, temperature-detecting element such as installation temperature sensor, later bond electric core piece 4 on built-in box 2 through structure glue film 7.

As shown in fig. 1, the cell has a length direction X, a thickness direction Y, and a width direction Z. In an embodiment, the battery cell block 4 includes a plurality of battery cells, the plurality of battery cells are arranged along the thickness direction, one side of each battery cell along the width direction faces the liquid cooling plate 5, and the plurality of battery cells are all in contact with the liquid cooling plate 5, so that the plurality of battery cells are uniform in heat dissipation.

In one embodiment, as shown in fig. 3 to 5, the plurality of electric core blocks 4 are divided into two parts, the plurality of electric core blocks 4 of each part are respectively connected in series, the first part electric core block 4 is provided with two first electrode connection terminals 41, the second part electric core block 4 is provided with two second electrode connection terminals 42, and one first electrode connection terminal 41 and one second electrode connection terminal 42 can be electrically connected. Taking four electrical core blocks 4 as an example for illustration, two electrical core blocks 4 located at the upper side are the first part, two electrical core blocks 4 located at the lower side are the second part, and the two electrical core blocks 4 at the upper side are connected in series through a copper bar 8 to respectively lead out two first electrode connecting ends 41, including a positive electrode end and a negative electrode end. The two electric core blocks 4 at the lower side are connected in series through the copper bar 8, and two second electrode connecting ends 42 are respectively led out and comprise a positive end and a negative end. One first electrode connection 41 and one second electrode connection 42 may be connected by a relay or the like. When a high voltage (600V) is required, the relay connects the two partial electrical core blocks 4, and the other first electrode connection 41 and the other second electrode connection 42 are respectively connected to the outside for power supply, as shown in fig. 3. When a low voltage (300V) is required, the relay disconnects the two partial core blocks 4 and selects either the two first electrode connection terminals 41 or the two second electrode connection terminals 42 to be connected to the outside for power supply, as shown in fig. 4 and 5. Through the structure, the battery pack has two voltage working modes, high voltage and low voltage are freely switched, and the applicability is improved. The switching control is carried out through structures such as a relay, and the operation is convenient and reliable. Specifically, the copper bar 8 is arranged between the electric core blocks 4, so that structural interference is avoided. Further, be connected with the pencil on the electric core piece 4 for gather voltage etc. refer to prior art can, no longer describe repeatedly.

In one embodiment, the battery cell block 4 includes a plurality of battery cells, the positive pole and the negative pole of the battery cell are located along the both sides of length direction, the plurality of battery cells are arranged along the thickness direction, the battery cell block 4 is respectively provided with a plurality of bars along the both sides of the battery cell length direction, the plurality of battery cells are connected through the bars, thereby realizing the series connection of the plurality of battery cells, and the bars are located on the both sides of the battery cell to avoid the structural interference with the liquid cooling plate 5.

In one embodiment, as shown in fig. 1, a sealant layer is disposed between the upper casing 11 and the lower casing 12 to protect the cell block 4. Specifically, the upper case 11 is provided with a mounting seat 15 for connecting with an external structure, such as a seat and an instrument panel when the battery pack is used in a vehicle, and the mounting seat 15 is used for connecting with the seat and the instrument panel. Specifically, the outer ring of the upper shell 11 is coated with glue to form a glue ring 16 for bonding with a vehicle body. In one embodiment, the housing assembly 1 further includes a sheet metal panel 13, the sheet metal panel 13 is connected to the upper housing 11 for connecting the BMS and BDU and other structures, and the specific BMS and BDU refer to the prior art and are not described again. In one embodiment, the connecting assembly 3 includes a bonding structure and a fastener, and when assembling, a structural adhesive is coated on the lower shell 12 to form the bonding structure, and the built-in box body 2 is bonded to the lower shell 12 through the bonding structure; after that, the built-in case 2 is coupled to the lower case 12 by a fastener such as a screw or a rivet. In one embodiment, the lower case 12 is provided with mounting beams 121, and the built-in box body 2 is connected to the mounting beams 121, so that the lower case 12 is prevented from being too thin and inconvenient to install. In one embodiment, the side of the intermediate beam 23 facing the mounting beam 121 is provided with an escape slot through which the mounting beam 121 can pass to connect with the intermediate beam 23, making the structure more compact.

Furthermore, the lower shell 12 is internally laid with a buffer cotton 14 for shock absorption. In one embodiment, the mounting beam 121 extends along a first direction to divide the bottom wall of the lower case 12 into two parts along a second direction, the cushion cotton 14 extends along the second direction, and the plurality of cushion cotton 14 are arranged on the bottom wall of the two parts of the lower case 12 along the first direction. In other embodiments, the cushion cotton 14 may be laid in other manners, and is not limited.

The embodiment also provides a vehicle comprising the battery pack, so that the cost is reduced.

The embodiment also provides a manufacturing method of the battery pack, which is used for manufacturing the battery pack and comprises the following steps:

s11, the built-in box body 2 is arranged in the lower shell 12;

s12, respectively loading the plurality of electric core blocks 4 into a plurality of cavities 2A of the built-in box body 2;

and S13, connecting the upper shell 11 with the lower shell 12.

Alternatively, in another embodiment, the method for manufacturing the battery pack includes the steps of:

s21, respectively loading the plurality of electric core blocks 4 into a plurality of cavities 2A of the built-in box body 2;

s22, the built-in box body 2 is arranged in the lower shell 12;

and S23, connecting the upper shell 11 with the lower shell 12.

Through the steps, the built-in box body 2, the upper shell 11 and the lower shell 12 are directly fed, the battery core block 4 is directly installed in the built-in box body 2, the battery module structure and the battery module assembly are omitted, the production difficulty is reduced, the production efficiency is improved, and the production cost is reduced. Specifically, the order of assembling the built-in case 2, the lower case 12, and the cell block 4 is not limited.

Further, a structural adhesive is first applied to the inside of the lower case 12 to form an adhesive structure, the built-in case 2 is put into the lower case 12 to be adhered, and then the built-in case 2 is attached to the mounting beam 121 of the lower case 12 by a fastening member.

Further, before the upper case 11 is coupled with the lower case 12, the following steps are further included:

s211, connecting the plurality of battery cells in series through the bus plates, punching structural adhesive on the built-in box body 2 to form a structural adhesive layer 7, and installing a temperature sensor;

s212, the battery cell block 4 is arranged in the cavity 2A of the built-in box body 2

S213, after the plurality of electric core blocks 4 are all arranged in the cavity 2A, installing a copper bar 8 and a wire harness so as to realize voltage switching in the following process;

s214, knotting structural adhesive at the top of the battery cell block 4 to form a structural adhesive layer 7;

s215, the liquid cooling plate 5 is adhered to the electric core block 4 through the structural adhesive layer 7, and the liquid cooling plate 5 is fixed on the middle beam 23 and/or the outer frame 21 of the built-in box body 2 through the waterproof rivet nut 6;

s216, applying sealant to the folded edge of the lower shell 12 to form a sealing adhesive layer;

s217, adhering the upper shell 11 to the sealing adhesive layer to realize the sealing connection of the upper shell 11 and the lower shell 12; then, the waterproof rivet nut 6 is tightly connected to the upper shell 11 through a nut; further, a locking riveting connection (SPR) process is adopted to connect the upper shell 11 and the lower shell 12;

and S218, mounting the sheet metal panel 13 on the upper shell 11.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The battery pack is characterized by comprising a shell assembly (1), a built-in box body (2) arranged in the shell assembly (1), a connecting assembly (3) and a plurality of electric core blocks (4), wherein the shell assembly (1) comprises an upper shell (11) and a lower shell (12), the connecting assembly (3) is connected with the built-in box body (2) and the lower shell (12), the built-in box body (2) is provided with a plurality of cavities (2A), and the electric core blocks (4) are respectively accommodated in the cavities (2A).

2. The battery pack according to claim 1, further comprising a liquid-cooling plate (5), wherein the liquid-cooling plate (5) is provided on a side of the upper end of the core block (4) facing the upper case (11).

3. The battery pack according to claim 2, wherein the electric core block (4) includes a plurality of cells arranged in a thickness direction, and one side of each of the plurality of cells in a width direction faces the liquid-cooled plate (5).

4. The battery pack according to claim 2, further comprising a waterproof blind rivet nut (6), wherein the waterproof blind rivet nut (6) connects the liquid-cooled plate (5) and the built-in case (2), and the upper case (11) is connected to the waterproof blind rivet nut (6).

5. Battery pack according to claim 4, characterized in that a structural glue layer (7) is provided between the electrical core block (4) and the bottom plate (22) of the internal casing (2); and/or a structural adhesive layer (7) is arranged between the electric core block (4) and the liquid cooling plate (5).

6. The battery pack according to claim 1, wherein the plurality of electric core blocks (4) are divided into two parts, the plurality of electric core blocks (4) of each part are respectively connected in series, a first part of the electric core blocks (4) is provided with two first electrode connection terminals (41), a second part of the electric core blocks (4) is provided with two second electrode connection terminals (42), and one first electrode connection terminal (41) and one second electrode connection terminal (42) can be electrically connected.

7. The battery pack according to claim 1, wherein a sealant layer is provided between the upper case (11) and the lower case (12).

8. A battery pack according to claim 1, wherein the housing assembly (1) is made of sheet metal.

9. The battery pack according to claim 1, wherein the built-in case (2) comprises an outer frame (21), a bottom plate (22), and an intermediate beam (23), the outer frame (21) and the bottom plate (22) are connected to form a receiving cavity, and the intermediate beam (23) is disposed in the receiving cavity and divides the receiving cavity into the plurality of cavities (2A).

10. The battery pack according to claim 1, wherein the electric core block (4) comprises a plurality of electric cores, positive electrodes and negative electrodes of the electric cores are positioned on the side surfaces along the length direction, the plurality of electric cores are arranged along the thickness direction, the electric core block (4) is provided with bars along the side surfaces along the length direction of the electric cores, and the plurality of electric cores are connected through the bars.

11. Battery pack according to claim 1, wherein the connection assembly (3) comprises:

an adhesive structure by which the built-in case (2) is adhered to the lower case (12); and/or

A fastener by which the built-in case (2) is connected to the lower case (12).

12. A battery pack according to any of claims 1-11, wherein the housing assembly (1) further comprises a sheet metal panel (13), the sheet metal panel (13) being connected to the upper housing (11).

13. Battery pack according to any of claims 1 to 11, characterized in that the lower case (12) is provided with mounting beams (121), the built-in case (2) being attached to the mounting beams (121).

14. A battery pack according to any one of claims 1 to 11, further comprising a temperature detection member provided between the built-in case (2) and the electric core block (4).

15. A vehicle comprising the battery pack according to any one of claims 1 to 14.

16. A method for manufacturing a battery pack, for manufacturing the battery pack according to any one of claims 1 to 14, comprising the steps of:

respectively loading a plurality of electric core blocks (4) into a plurality of cavities (2A) of the built-in box body (2);

the built-in box body (2) is arranged in the lower shell (12);

connecting the upper shell (11) with the lower shell (12).