CN214153042U

CN214153042U - Battery module

Info

Publication number: CN214153042U
Application number: CN202022921256.XU
Authority: CN
Inventors: 蒋碧文; 朱圣法; 陈卓烈; 何亚飞; 赵卫军
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2021-09-07
Anticipated expiration: 2030-12-08

Abstract

The utility model discloses a battery module, including the casing with set up in a plurality of electric core units in the casing, electric core unit has a pair of relative first side, a pair of relative second side and a pair of relative tip. The plurality of battery cell units are arranged in a manner that the first sides are opposite to each other. This battery module still includes the heat insulating part, and this heat insulating part forms and a plurality of compartments of a plurality of electric core unit cooperations, and the compartment has top, bottom and lateral part, and each electric core unit encapsulates in a compartment to and the top and the bottom of compartment and the cooperation of a pair of relative first side of electric core unit, the lateral part of compartment and the cooperation of a pair of relative second side of electric core unit. The utility model discloses a battery module forms airtight space about the upper and lower of electric core unit, makes the electric core unit out of control of thermal runaway can only release the heat to both ends, can not expand adjacent electric core, can effectively prevent the thermal diffusion.

Description

Battery module

Technical Field

The utility model relates to a battery field, concretely relates to battery module.

Background

The performance and safety of the battery module as a power component of an electric device, such as an electric vehicle, are particularly important for the development of the electric device, and the thermal management requirements for the battery module are becoming more strict. The cell unit of the existing battery module mostly prevents the heat diffusion between the cells through the partition board. However, the manner of using the separator has the following drawbacks:

first, the separator cannot form a closed space, and the heat of a thermally runaway cell can be conducted to another cell through the upper or lower slit.

Secondly, the separator solution is mostly suitable for hard shells and not suitable for pouch cell structures.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a battery module to solve the problem that exists among the above-mentioned prior art.

In order to solve the above problem, according to an aspect of the present invention, a battery module is provided, including a housing and a plurality of cell units disposed in the housing, the cell unit has a pair of opposite first sides, a pair of opposite second sides and a pair of opposite ends, the cell units are arranged in a manner opposite to the first sides, the battery module further includes a heat insulating member, the heat insulating member forms a plurality of compartments matched with the cell units, the compartments have a top, a bottom and a lateral part, each cell unit is packaged in one compartment, and the top and the bottom of the compartment are matched with the pair of opposite first sides of the cell unit, the lateral part of the compartment is matched with the pair of opposite second sides of the cell unit.

In one embodiment, the thermal insulation forms a plurality of individual compartments cooperating with the plurality of cell units, each compartment comprising an integrally formed top, bottom and sides.

In one embodiment, the top, bottom and sides of the compartment have the same thickness.

In one embodiment, the thermal shield includes a top assembly, a bottom assembly, and a plurality of spacers, the top and bottom assemblies being disposed proximate a pair of opposing second sides of the cell unit, and the plurality of spacers being disposed proximate a pair of opposing first sides of the cell unit.

In one embodiment, each of the plurality of spacers has both ends attached to the inner surfaces of the top and bottom assemblies, respectively, thereby forming a plurality of the compartments between the top and bottom assemblies.

In one embodiment, the two ends of the spacer are respectively connected with the top assembly and the bottom assembly in a sealing mode.

In one embodiment, the top and bottom components have the same thickness, and the spacer has a thickness greater than the thickness of the top and bottom components.

In one embodiment, the insulation is made of fire insulating insulation.

In one embodiment, the fire insulating material comprises foam, aerogel, mica sheets, foam and/or heat conducting structural glue.

In one embodiment, the casing includes a U-shaped frame and a cover body, and the cover body is fitted to an opening of the U-shaped frame to enclose the plurality of cell units in the U-shaped frame.

In one embodiment, positive electrode tabs and negative electrode tabs are respectively arranged at two ends of the battery cell unit, and the length of the heat insulating piece is greater than that of the battery cell unit, so that the heat insulating piece shields parts of the electrode tabs at the two ends of the battery cell unit.

The utility model discloses a battery module forms airtight space about the upper and lower of electric core unit, makes the electric core unit out of control of thermal runaway can only release the heat to both ends, can not expand adjacent electric core to can effectively prevent the thermal diffusion.

Drawings

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

fig. 2 is a perspective view of one of the cell units of the battery module;

fig. 3 is a cross-sectional view of one cell unit of fig. 2;

fig. 4 is an exploded perspective view of a battery module according to another embodiment of the present invention; and

fig. 5 is a sectional view of the battery module of fig. 4.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the following description, for the sake of clarity, the structure and operation of the present invention will be described with the aid of directional terms, but the terms "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be understood as words of convenience and not as words of limitation.

Referring to fig. 1, fig. 1 is an exploded perspective view of a battery module 100 according to an embodiment of the present invention, fig. 2 is a perspective view of one of battery cells of the battery module 100, and fig. 3 is a cross-sectional view of the battery cell of fig. 2. The embodiment of the utility model provides a battery module 100, for example this battery module 100 can be laminate polymer battery, can be applied to the electric automobile field, perhaps similar industrial field.

As shown in fig. 1 to 3, the battery module 100 includes a casing 10 and a plurality of cell units 20 disposed in the casing 10, each cell unit 20 has a pair of opposite first side surfaces 21, a pair of opposite second side surfaces 22, and a pair of opposite end portions 23, the pair of opposite first side surfaces 21 may be wider opposite front and rear surfaces of the cell unit 20, and the pair of opposite second side surfaces 22 may be narrower upper and lower surfaces. A pair of opposing ends 23 may be provided with cell tabs 24, for example, to connect the cathode and anode of the cell, respectively.

In the battery module 100, the plurality of battery cells 20 are arranged in a manner such that the first side of each battery cell is opposite to the first side of an adjacent battery cell. The battery module 100 further includes a heat insulator 40, and the heat insulator 40 encapsulates the pair of opposing first sides 21 and the pair of second sides 22 of the cell unit 20. In the embodiment shown in fig. 1-3, the thermal insulator 40 forms a compartment 44 enclosing the cell unit 20, the compartment 44 including a top 41, a bottom 42, and sides 43, the cell unit 20 being disposed within the compartment 44, the sides 43 of the compartment 44 being disposed proximate to the pair of opposing first sides 21 of the cell unit, and the top 41 and the bottom 42 of the compartment 44 being disposed proximate to the pair of opposing second sides 22, thereby sealing around the cell unit 20 and being open only at the pair of opposing ends 23 of the cell unit 20. Therefore, a closed space is formed above, below, on the left and right sides of the battery cell unit 20, so that heat of the battery cell out of control due to heat can be released only to two ends and cannot be expanded to adjacent battery cells, and therefore heat diffusion can be effectively prevented.

The thermal insulation member 40 is made of a fire-insulating material, such as foam, aerogel, mica sheet, foam, and heat-conducting structural adhesive, but those skilled in the art will understand that the thermal insulation member 40 can be made of other fire-insulating materials, and is not limited to the above-mentioned materials.

In one embodiment, the thermal insulation member 40 has a length greater than that of the cell unit 20, so that a portion of the tab 24 at the opposite end portions of the cell unit 20 is shielded, thereby more effectively preventing heat diffusion.

In one embodiment, each cell unit 20 has a separate compartment 44 formed by the thermal insulation 40, and the compartment 44 is preferably integrally formed. That is, as shown in fig. 2 to 3, the heat insulating member 40 is a casing structure which is closed on the periphery and is open only at both ends, and which internally forms a cavity in which the cell unit 20 is disposed in accordance with the shape and size of the cell unit 20. Preceding, back, upper and lower all of the cavity in this casing are sealed, only open at both ends to form airtight space about electrical core unit 20, when electric core takes place thermal runaway in the battery module, the heat of thermal runaway's electric core can only release to both ends, can not expand adjacent electric core, effectively prevents the thermal diffusion.

Referring to fig. 1, a case 10 of a battery module 100 includes a U-shaped frame 11 and a cover 12, and the cover 12 is fitted to a top opening of the U-shaped frame 11 to form the case 10 having a closed periphery and two open ends. During the assembly, utilize heat insulating part 40 to encapsulate each electric core unit 20 earlier, put into U-shaped frame 11 with heat insulating part 40 and the electric core unit 20 who encapsulates inside it again, then put lid 12 again, accomplish the equipment of battery module.

A detailed description of another embodiment of the present invention is provided below with reference to fig. 4-5. The difference between this embodiment and the previous embodiment is mainly embodied in the structure of the heat insulation member, and the other structures are the same as the previous embodiment. Fig. 4 is an exploded perspective view of a battery module 200 according to another embodiment of the present invention, and fig. 5 is a cross-sectional view of the battery module of fig. 4.

As shown in fig. 4 to 5, the battery module 200 includes a casing 10 and a plurality of cell units 20 disposed in the casing 10, each cell unit 20 having a pair of opposite first side surfaces 21, a pair of opposite second side surfaces 22, and a pair of opposite end portions 23, the pair of opposite first side surfaces 21 may be wider opposite front and rear surfaces of the cell unit 20, and the pair of opposite second side surfaces 22 may be narrower upper and lower surfaces. A pair of opposing ends 23 may be provided with cell tabs 24, for example, to connect the cathode and anode of the cell, respectively.

In the battery module 200, the plurality of cell units 20 are arranged in such a manner that the first side of each cell unit is opposite to the first side of the adjacent cell. The battery module 200 further includes a heat insulator 50, and the heat insulator 50 encapsulates the pair of first and second

opposite sides

21 and 22 of the cell unit 20. In the embodiment shown in fig. 4-5, the thermal shield 50 comprises a plurality of components independent of each other, including, for example, a top component 51, a bottom component 52, and a plurality of spacers 53. The spacer 53 is provided between two adjacent cell units, specifically, the spacer 53 is arranged between the first sides of the two adjacent cell units and between the first sides of the cell units and the casing, that is, the spacer 53 is used to shield the first sides of the cell units 20. The top assembly 51 and the bottom assembly 52 are disposed at the top and bottom of the plurality of cell units 20, respectively, that is, disposed adjacent to the opposite second sides 22 of the plurality of cell units 20, for shielding the opposite second sides 22 of the cell units 20.

The upper and lower end faces of the spacer 53 are butted against the top block 51 and the bottom block 52, respectively. In other words, the top assembly 51, the bottom assembly 52 and the plurality of spacers 53 of the thermal insulation member 50 form a cavity having a plurality of compartments, the top assembly 51 and the bottom assembly 52 are respectively located at the top and the bottom of the cavity, the plurality of spacers 53 are disposed between the top assembly 51 and the bottom assembly 52 and connected with the top assembly 51 and the bottom assembly 52, and a compartment matched with one cell unit is formed between every two spacers 53. Each compartment is mounted within one cell unit 20. Since each cell unit 20 is approximately equal in length, width, and height, each compartment has approximately equal space, that is, the spacers 53 are evenly arranged between the top assembly 51 and the bottom assembly 52.

In one embodiment, the upper end and the lower end of the spacer 53 are hermetically connected to the top assembly 51 and the bottom assembly 52, respectively, so as to seal the periphery of the cell unit disposed in the compartment formed by the spacer, that is, the opposite first side surface and the opposite second side surface of the cell unit 21, and only the opposite end portions of the cell unit 21 are kept open, so that a closed space is formed above, below, on the left, and the right of the cell unit 20, so that the heat of the thermal runaway cell can be released only to the two ends and cannot spread to the adjacent cells, and therefore, the heat diffusion can be effectively prevented.

Similar to the thermal insulation member 40, the thermal insulation member 50 is made of fire insulation material, such as foam, aerogel, mica sheet, foam, heat conductive structural adhesive, etc., however, it will be understood by those skilled in the art that the thermal insulation member 50 can be made of other fire insulation material, and is not limited to the above-mentioned materials.

In one embodiment, the thermal insulation member 50 has a length greater than that of the cell unit 20, so that a portion of the tab 24 at the opposite end portions of the cell unit 20 is shielded, thereby more effectively preventing heat diffusion.

In one embodiment, the top and

bottom members

51, 52 of the thermal shield 50 have the same thickness, while the spacers 53 have a thickness greater than the top and

bottom members

51, 52, preferably, the thickness of each spacer 53 is substantially equivalent.

Referring to fig. 4, the case 10 of the battery module 200 includes a U-shaped frame 11 and a cover 12, and the cover 12 is fitted to the top opening of the U-shaped frame 11 to form the case 10 having closed four sides and open two ends. During assembly, the bottom assembly 52 of the thermal insulation member 50 is installed, the spacers 53 are uniformly spaced on the bottom assembly 52 to form substantially uniformly spaced compartments, the plurality of cell units are placed in one compartment, the top assembly 51 is used to seal the top of the plurality of compartments, and the cover 12 is placed. The assembly of the battery module 200 is completed.

It should be noted that, the above only provides two exemplary embodiments, and those skilled in the art can make various modifications to the above embodiments, for example, some unnecessary components are added or reduced as needed, as long as the opposite first side and the opposite second side of the cell unit are encapsulated by the fire-insulating material, so that a closed space is formed above, below, or on the left and right of the cell unit, when a thermal runaway occurs in the cell in the battery module, the heat of the thermal runaway cell can only be released to both ends, and cannot be expanded to the adjacent cell, thereby effectively preventing thermal diffusion, and all belong to the protection scope of the present invention.

The preferred embodiments of the present invention have been described in detail, but it should be understood that various changes and modifications can be made by those skilled in the art after reading the above teaching of the present invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims

1. A battery module comprising a housing and a plurality of cell units disposed within the housing, the cell units having a pair of opposing first sides, a pair of opposing second sides, and a pair of opposing ends, the cell units arranged in a manner such that the first sides are opposing, wherein the battery module further comprises a thermal insulation member forming a plurality of compartments cooperating with the cell units, the compartments having a top, a bottom, and sides, each cell unit being enclosed within a compartment, and the top and bottom of the compartment cooperating with the pair of opposing first sides of the cell unit, the sides of the compartment cooperating with the pair of opposing second sides of the cell unit.

2. The battery module of claim 1, wherein the thermal insulation forms a plurality of individual compartments that mate with the plurality of cell units, each compartment comprising an integrally formed top, bottom, and sides.

3. The battery module according to claim 2, wherein the top, bottom and sides of the compartment have the same thickness.

4. The battery module of claim 1, wherein the thermal shield comprises a top assembly, a bottom assembly, and a plurality of spacers, the top and bottom assemblies being disposed proximate a pair of opposing second sides of the cell unit, and the plurality of spacers being disposed proximate a pair of opposing first sides of the cell unit.

5. The battery module according to claim 4, wherein both ends of each of the plurality of spacers are connected to the inner surfaces of the top and bottom members, respectively, thereby forming the plurality of compartments between the top and bottom members.

6. The battery module according to claim 4, wherein both ends of the spacer are hermetically connected to the top and bottom members, respectively.

7. The battery module according to claim 4, wherein the top member and the bottom member have the same thickness, and the spacer has a thickness greater than the thickness of the top member and the bottom member.

8. The battery module according to any one of claims 1 to 7, wherein the heat insulating member is made of a fire-insulating heat insulating material.

9. The battery module according to any one of claims 1 to 7, wherein the housing comprises a U-shaped frame and a cover, and the cover is engaged with an opening of the U-shaped frame to enclose the plurality of cell units in the U-shaped frame.

10. The battery module of claim 1, wherein positive and negative electrode tabs are respectively disposed at two ends of the cell unit, and the length of the heat insulating member is greater than that of the cell unit, so that the heat insulating member shields a portion of the electrode tabs at two ends of the cell unit.