CN220138656U

CN220138656U - Battery module and battery pack

Info

Publication number: CN220138656U
Application number: CN202321661909.2U
Authority: CN
Inventors: 黄立亮
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2023-06-28
Filing date: 2023-06-28
Publication date: 2023-12-05
Anticipated expiration: 2033-06-28

Abstract

The utility model relates to the technical field of batteries, in particular to a battery module and a battery pack. The battery module comprises a bracket and a plurality of battery cells, the bottom surface of each battery cell is provided with a pressure release valve, and the bottom surface of each battery cell is full of an insulating coating. The plurality of battery cells are the array and install on the bracket, and a plurality of release channels have been seted up to the bracket, and the relief valve of a plurality of battery cells is just to setting up with corresponding release channel respectively, and a plurality of release channels all can communicate with the pressure release cavity of bracket below. The battery pack comprises the battery module, and the insulating coating is sprayed on the bottom surface of the battery cell, so that a mica sheet does not need to be installed, the assembly efficiency of the battery module is improved, and the assembly cost is reduced. Meanwhile, the insulating coating has higher stability and reliability, and the safety of the battery pack is further improved.

Description

Battery module and battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery module and a battery pack.

Background

In the box of battery package, the electricity core is installed on the support in the tray, encloses into the pressure release cavity between the bottom backplate of tray and box, and the relief valve is installed to the bottom surface of electricity core. When the single cell is out of control, the high-temperature and high-pressure gas in the cell breaks through the pressure release valve and enters the pressure release cavity. Because the bottom surface of each electric core is communicated with the pressure relief cavity, when the high-temperature high-pressure gas generated by thermal runaway is mixed with conductive substances and enters the pressure relief cavity, arc-striking short circuit is easy to occur to other electric cores, and dangerous conditions such as explosion and fire are caused when serious conditions exist.

The existing battery pack is generally provided with an insulating sheet (mica paper with the thickness of about 0.5 mm) attached to the bottom surface (the surface provided with the pressure release valve) of each battery cell so as to realize the insulation between the bottom surface of the battery cell and the pressure release cavity and avoid arc discharge short circuit of the battery cell. Because mica paper is lighter and thinner and small in size, the difficulty of manual assembly is high, the assembly time of the battery module is prolonged, and the assembly cost is increased.

Disclosure of Invention

The utility model aims to provide a battery module and a battery pack, which are used for solving the problems of low assembly efficiency and high cost of the battery module caused by high mounting difficulty of mica paper in the prior art.

The technical scheme adopted by the utility model is as follows:

a battery module, comprising:

the battery comprises a plurality of battery cells, wherein the bottom surface of each battery cell is provided with a pressure release valve, and the bottom surface of each battery cell is coated with an insulating coating;

the battery cell is arranged on the bracket in an array mode, a plurality of release channels are formed in the bracket, the pressure release valves of the battery cells are opposite to the corresponding release channels respectively, and the release channels can be communicated with the pressure release cavities below the bracket.

Preferably, the thickness of the insulating coating is 0.1 mm-0.5 mm.

Preferably, the battery cell is a cylindrical battery cell.

Preferably, the bracket includes:

the battery cells are arranged on the support in an array manner, a plurality of first holes are formed in the support, and the pressure release valves of the battery cells are arranged opposite to the corresponding first holes respectively;

the tray, the support is arranged in the tray, a plurality of second holes have been seted up on the tray, first hole with the coaxial intercommunication of second hole one-to-one forms the release passageway.

Preferably, the plurality of battery cells, the support and the tray are connected through glue filling and bonding.

As a preferred scheme, the battery module further comprises a liquid cooling system, the liquid cooling system is provided with a plurality of liquid cooling plates, and one liquid cooling plate is arranged between the circumferential side surfaces of each two rows of the battery cells.

As a preferred scheme, the battery module further comprises an acquisition module, and the acquisition module is arranged on the top surface of the battery cell.

Preferably, the acquisition module includes:

the support plate is arranged on the top surface of the battery cell;

the busbar is arranged on the supporting plate, and a plurality of battery cells are electrically connected through the busbar to form a battery cell group.

Preferably, the battery module further comprises an insulating film, and the insulating film is covered above the collecting module.

The battery pack comprises the battery module.

The beneficial effects of the utility model are as follows:

according to the battery module provided by the utility model, the bottom surface of the battery cell is fully coated with the insulating coating, and the pressure release valve is covered by the insulating coating, so that the bottom surface of the battery cell has good insulating performance. Compared with manually mounting mica sheets, the spraying efficiency of the insulating coating is higher, the difficulty is smaller, the assembly efficiency of the battery module is improved, and the assembly cost is reduced. When the single electric core is in thermal runaway, other electric cores are insulated with high-temperature and high-pressure gas sprayed out of the thermal runaway through the insulating coating, so that the other electric cores are prevented from arc-discharge short circuits, and the safety of the battery module is improved. Meanwhile, the insulating coating has higher stability and reliability, and the safety of the battery module is further improved.

The battery pack provided by the utility model comprises the battery module, and the insulating coating is fully coated on the bottom surface of the battery core, so that the assembly efficiency and the safety of the battery are improved, and the assembly cost is reduced. Meanwhile, the insulating coating has higher stability and reliability, and the safety of the battery pack is further improved.

Drawings

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

fig. 2 is a schematic view showing a partial structure of a longitudinal section of a battery pack according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a battery cell according to an embodiment of the present utility model.

The parts in the figures are named and numbered as follows:

1. a battery cell; 11. a pressure release valve; 12. an insulating coating; 2. a bracket; 20. a release channel; 21. a bracket; 210. a first hole; 22. a tray; 3. a liquid cooling plate; 4. an acquisition module; 5. an insulating film; 6. a bottom guard board; 60. the pressure relief cavity.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present utility model are shown.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

As shown in fig. 1 and 2, this embodiment provides a battery pack, the battery pack includes a battery module and a box, the box includes a frame and a bottom guard plate 6, the frame is rectangular and is mounted on the bottom guard plate 6, and the battery module is mounted on the frame by fasteners such as bolts, so as to realize stable mounting of the battery module.

Specifically, the battery module includes bracket 2 and a plurality of electric core 1, and the bottom surface of electric core 1 is provided with relief valve 11, and a plurality of electric cores 1 are the array and install on bracket 2, and a plurality of release channels 20 have been seted up to bracket 2, and the relief valve 11 of a plurality of electric cores 1 is just to setting up with corresponding release channel 20 respectively, and a plurality of release channels 20 all can communicate with the pressure release cavity 60 of bracket 2 below. When the battery module is mounted on the frame, the edge of the bracket 2 is lapped and fixed on the frame, and a pressure release cavity 60 of 3-5 mm is formed between the bottom of the bracket 2 and the bottom guard plate 6. When thermal runaway occurs in the single cell 1, the high-temperature and high-pressure gas inside the cell 1 breaks through the corresponding pressure release valve 11 and enters the pressure release cavity 60 through the release channel 20.

Further, the bracket 2 includes a bracket 21 and a tray 22, the plurality of battery cells 1 are arranged on the bracket 21 in an array, a plurality of first holes 210 are formed in the bracket 21, and the pressure release valves 11 of the plurality of battery cells 1 are opposite to the corresponding first holes 210 respectively. The bracket 21 is disposed in the tray 22, and a plurality of second holes are formed in the tray 22, and the first holes 210 and the second holes are coaxially communicated in one-to-one correspondence to form the release channel 20. The horizontal edges of the tray 22 are lapped and fixed on the frame, and the pressure relief cavity 60 is formed between the bottom of the tray 22 and the bottom guard plate 6.

In this embodiment, the plurality of battery cells 1, the support 21 and the tray 22 are connected by glue filling and bonding. It should be noted that, the battery cell 1 in this embodiment is a cylindrical battery cell. In other embodiments, the battery cell 1 may be a square aluminum case battery cell or the like, which is not particularly limited herein. Specifically, the top surface in the axial direction of the battery cell 13 is provided with a positive pole post, the bottom surface in the axial direction of the battery cell 13 is a negative pole, and the pressure release valve 11 is installed. When the battery cell 1 is assembled, glue is filled in the tray 22 so as to bond and connect the battery cell 1, the bracket 21 and the tray 22, so that the battery cell 1, the bracket 21 and the tray 22 form a stable integral structure, and the assembly operation is convenient. Meanwhile, heat conduction structural adhesive is filled between the plurality of battery cores 1, so that the plurality of battery cores 1 are adhered into a whole through the heat conduction structural adhesive. In addition, each battery cell 1 can conduct heat through the heat conducting structural adhesive, so that the heat dissipation efficiency of the battery cell 1 is improved.

Further, the battery module further comprises a liquid cooling system, the liquid cooling system is provided with a plurality of liquid cooling plates 3, and one liquid cooling plate 3 is arranged between the circumferential side surfaces of each two rows of battery cells 1. The cooling medium (typically water) in the liquid cooling plate 3 is in contact with the circumferential side surface of the battery cell 1 to realize heat exchange, so as to cool or heat the battery cell 1. The liquid cooling system also comprises a pipeline, a cold source and other structures, and the cold source cools or heats the cooling medium according to the environment where the battery module is located so as to cool or heat the battery cell 1. The plurality of liquid cooling plates 3 are connected in parallel or in series through pipelines and are communicated with a cold source through pipelines at the same time so as to realize the functions of circulating cooling and circulating heating of the liquid cooling system. Because the liquid cooling system is the prior art, the specific structure and the working principle of the liquid cooling system are not repeated.

As shown in fig. 1, the battery module further includes an acquisition module 4, and the acquisition module 4 is disposed on the top surface of the battery cell 1. Specifically, the collection module 4 includes a support plate and a busbar, and the support plate is disposed on the top surface of the cell 1 in the axial direction. The busbar is arranged on the supporting plate, and the plurality of battery cells 1 are electrically connected through the busbar to form a battery cell group. Specifically, the bus bar is connected with the poles of the battery cell 1 by welding.

It should be noted that, the collection module 4 further includes an FRC flexible board, a collection sheet, and the like, and the FPC flexible board is welded with the corresponding bus bar through the collection sheet, so as to collect parameters such as temperature and pressure of each electric core 1.

Further, the battery module further comprises an insulating film 5, and the insulating film 5 covers the collecting module 4, so that the collecting module 4 and the box body are installed in an insulating mode, short circuits of the collecting module 4 are avoided, and the safety of the battery module is improved.

As shown in fig. 2, the bottom surface of each cell 1 is communicated with the pressure release cavity 60, when the high-temperature and high-pressure gas generated by thermal runaway is mixed with conductive substances and enters the pressure release cavity 60, arc-striking short circuit is easy to occur in other cells 1, and explosion and fire are easy to occur in serious cases.

In the existing battery pack, a piece of mica paper with the thickness of about 0.5mm is attached to the bottom surface of each battery cell, so that the insulation between the bottom surface of each battery cell and the pressure release cavity 60 is realized. Because mica paper is lighter and thinner and small in size, the difficulty of manual assembly is high, the assembly time of the battery module is prolonged, and the assembly cost is increased.

In order to solve the above-mentioned problems, as shown in fig. 3, the bottom surface of the battery cell 1 of the present embodiment is coated with an insulating coating 12, and the insulating coating 12 is covered on the pressure release valve 11, so that the bottom surface of the battery cell 1 has good insulating properties. Compared with manually mounting mica sheets, the spraying efficiency of the insulating coating 12 is higher, the difficulty is smaller, the assembly efficiency of the battery module is improved, and the assembly cost is reduced. When the single electric core 1 is in thermal runaway, other electric cores 1 are insulated with high-temperature and high-pressure gas sprayed out of the thermal runaway through the insulating coating 12, so that the other electric cores 1 are prevented from arc-discharge short circuit, and the safety of the battery module is improved. Meanwhile, the insulating coating 12 has high stability and reliability, and the safety of the battery module is further improved.

Further, the thickness of the insulating coating 12 is 0.1mm to 0.5mm. The thickness of the insulating coating 12 in this embodiment is preferably 0.1mm, so that the insulating coating 12 has sufficient insulating performance and a coating thickness as small as possible, so that the height and volume of the battery module are reduced as much as possible. The insulating coating 12 is made of an epoxy resin material, which is cheap and easy to obtain and can be firmly sprayed on the bottom surface of the battery cell 1. Of course, the insulating coating 12 may be formed by spraying other insulating materials, so long as insulation between the bottom surface of the battery cell 1 and the pressure release cavity 60 can be achieved, which is not limited herein. The thickness of the insulating coating 12 may also be 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc., which are not shown here.

The battery pack of the embodiment comprises the battery module, and the insulating coating 12 is fully coated on the bottom surface of the battery cell 1, so that the assembly efficiency and the safety of the battery pack are improved, and the assembly cost is reduced. Meanwhile, the insulating coating 12 has higher stability and reliability, and the safety of the battery pack is further improved.

The above embodiments merely illustrate the basic principle and features of the present utility model, and the present utility model is not limited to the above embodiments, but may be varied and altered without departing from the spirit and scope of the present utility model. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The battery module, its characterized in that includes:

the battery pack comprises a plurality of battery cells (1), wherein a pressure release valve (11) is arranged on the bottom surface of each battery cell (1), and an insulating coating (12) is coated on the bottom surface of each battery cell (1);

the battery cell structure comprises a bracket (2), a plurality of battery cells (1) are arranged on the bracket (2) in an array manner, a plurality of release channels (20) are formed in the bracket (2), pressure release valves (11) of the battery cells (1) are respectively opposite to the corresponding release channels (20), and the release channels (20) can be communicated with a pressure release cavity (60) below the bracket (2).

2. The battery module according to claim 1, wherein the thickness of the insulating coating (12) is 0.1mm to 0.5mm.

3. The battery module according to claim 1, wherein the cell (1) is a cylindrical cell (1).

4. A battery module according to any one of claims 1 to 3, wherein the bracket (2) comprises:

the battery cell (1) is arranged on the bracket (21) in an array, a plurality of first holes (210) are formed in the bracket (21), and the pressure release valves (11) of the battery cells (1) are respectively opposite to the corresponding first holes (210);

the tray (22), support (21) set up in tray (22), a plurality of second holes have been seted up on tray (22), first hole (210) with the coaxial intercommunication of second hole one-to-one forms release passageway (20).

5. The battery module according to claim 4, wherein the plurality of battery cells (1), the bracket (21) and the tray (22) are connected by glue-pouring bonding.

6. A battery module according to any one of claims 1-3, characterized in that the battery module further comprises a liquid cooling system having a plurality of liquid cooling plates (3), one liquid cooling plate (3) being provided between the circumferential sides of each two rows of the cells (1).

7. A battery module according to any one of claims 1-3, characterized in that the battery module further comprises an acquisition module (4), the acquisition module (4) being arranged on the top surface of the cell (1).

8. The battery module according to claim 7, wherein the acquisition module (4) includes:

the support plate is arranged on the top surface of the battery cell (1);

the bus bars are arranged on the supporting plate, and the plurality of battery cells (1) are electrically connected through the bus bars to form a battery cell group.

9. The battery module according to claim 7, further comprising an insulating film (5), wherein the insulating film (5) is covered over the collecting module (4).

10. Battery pack, characterized in that it comprises a battery module according to any one of claims 1 to 9.