CN216161814U

CN216161814U - Module unit, battery module and battery pack

Info

Publication number: CN216161814U
Application number: CN202121327780.2U
Authority: CN
Inventors: 吴斌
Original assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Current assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2022-04-01
Anticipated expiration: 2031-06-15

Abstract

The utility model provides a module unit, a battery module and a battery pack, wherein the module unit comprises a battery cell structure and heat insulating layers respectively arranged on two sides of the battery cell structure, each heat insulating layer comprises a heat insulating side wall arranged on the side surface of the battery cell structure and a heat insulating top wall arranged on the top surface of the battery cell structure, the heat insulating side walls and the heat insulating top walls are mutually connected, and an exhaust structure is arranged between the heat insulating top walls on the top surface of the battery cell structure. According to the module unit, the battery module and the battery pack provided by the utility model, the heat insulation side wall is arranged on the side surface of the battery cell structure, and the heat insulation top wall is arranged on the top surface of the battery cell structure, so that an exhaust structure is formed between the two heat insulation top walls on the top surface of the battery cell structure. Under the parcel of insulating layer, make electric core structure be the closed form, when electric core structure thermal runaway exhausts, under the guide of exhaust structure, high-temperature gas can be followed exhaust structure and located to discharge, follows the top discharge of electric core structure promptly, and the heat can not stretch to adjacent module unit, can reduce other module unit thermal runaway's possibility.

Description

Module unit, battery module and battery pack

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a module unit, a battery module and a battery pack.

Background

The power battery pack can be applied to vehicles such as electric automobiles, electric trains, electric bicycles, Gaolu vehicles and the like to provide power for the vehicles. The power battery pack can generate heat in the using process, if heat cannot be timely dissipated or one battery module breaks down, the power battery pack is very likely to be out of order or even explode due to the fact that the heat is rapidly increased. In order to ensure the use safety of the power battery pack, the national requirements on the safety of the power battery pack are higher and higher, and the requirements on the thermal spreading safety of the power battery pack are also higher and higher. The thermal spread means that when one of the battery cells in the battery pack is out of control due to heat, the heat cannot be effectively discharged, so that the adjacent battery is easily subjected to thermal runaway, and further the whole battery pack is subjected to thermal runaway and accompanied with an exhaust phenomenon. For a power battery pack, some manufacturers consider to add a heat insulating material between the battery cells and consider the problem of exhausting gas generated instantly when the battery cells are out of control due to heat, but the exhaust position is often the leading-out position of the positive electrode and the negative electrode of the battery cells. In this kind of scheme, when electric core length is longer, electric core middle part thermal runaway still can't effectively discharge the heat to arouse adjacent battery to take place thermal runaway easily. In order to prevent thermal spread, effective measures must be taken to inhibit the first thermal runaway cell, so as to prevent the first thermal runaway cell from triggering subsequent cells to continue to generate thermal runaway.

SUMMERY OF THE UTILITY MODEL

An object of the embodiments of the present invention is to provide a module unit, a battery module, and a battery pack, so as to solve the technical problem in the prior art that thermal runaway of all battery cells may occur due to thermal runaway of one of the battery cells.

In order to achieve the purpose, the utility model adopts the technical scheme that: the utility model provides a module unit, includes electric core structure and locates respectively the insulating layer of electric core structure both sides, the insulating layer is including locating the thermal-insulated lateral wall of electric core structure side and locating the thermal-insulated roof of electric core structure top surface, thermal-insulated lateral wall with thermal-insulated roof interconnect, two of electric core structure top surface exhaust structure has between the thermal-insulated roof.

When the scheme is adopted, the side face of the cell structure is arranged on the heat insulation side wall, and the top face of the cell structure is arranged on the heat insulation top wall, so that an exhaust structure is formed between the two heat insulation top walls of the cell structure top face. Under the parcel of insulating layer, make electric core structure be the closed form, when electric core structure thermal runaway exhausts, under the guide of exhaust structure, high-temperature gas can be followed exhaust structure and located to discharge, follows the top discharge of electric core structure promptly, and the heat can not stretch to adjacent module unit, can reduce other module unit thermal runaway's possibility.

In one embodiment, the two heat insulation top walls on the top of the cell structure are mutually abutted or arranged at intervals.

When adopting above-mentioned scheme, two adjacent thermal-insulated roof butt each other or the interval sets up all can form foretell exhaust structure. When two adjacent heat insulation top walls are mutually abutted, the heat insulation top walls have good wrapping performance on the top of the battery cell structure, and heat can be effectively prevented from being transmitted from the top of the module unit; when two adjacent thermal-insulated roof intervals set up, exhaust structure is great, and when module unit thermal runaway, high-temperature gas discharged more easily.

In one embodiment, the bottom surface of the cell structure is provided with a heat conduction layer, and two sides of the heat conduction layer are respectively connected with the two heat insulation side walls.

When the scheme is adopted, the heat conduction layer is arranged on the bottom surface of the cell structure, so that the cell structure can quickly dissipate heat through the bottom surface of the cell structure, heat cannot be accumulated inside the module unit all the time, and the possibility of thermal runaway of the cell structure is reduced.

In one embodiment, the insulating top wall is capable of being detached from the top surface of the cell structure under the action of an air flow.

When the scheme is adopted, the heat insulation top wall can be lifted under the action of airflow, and part or all of the heat insulation top wall is separated from the top surface of the cell structure. When thermal-insulated roof was lifted, the exhaust structure increase, and instantaneous combustion gas increases, can the express delivery reduce the heat of this electric core structure, prevents that heat from stretching.

In one embodiment, the two heat insulating layers on the two sides of the battery cell structure are integrally formed, and the exhaust structure is a thin-wall structure.

When the scheme is adopted, the exhaust structure is of a thin-wall structure, when high-temperature gas rushes out, the air pressure is higher, and the thickness of the thin-wall structure is smaller than that of other parts of the heat insulation layer, so that the high-temperature gas can break through the thin-wall structure and rush out from the thin-wall structure.

The utility model also provides a battery module, which comprises the module unit and a module shell wrapping the module unit.

When the scheme is adopted, the heat insulation layer in the module unit comprises the heat insulation side wall and the heat insulation top wall which are connected with each other, the side face of the battery cell structure is arranged on the heat insulation side wall, the heat insulation top wall is arranged on the top face of the battery cell structure, and an exhaust structure is formed between the two heat insulation top walls of the battery cell structure top face. Under the parcel of insulating layer, make electric core structure be the closed form, each module unit is the closed form promptly, when certain electric core structure thermal runaway exhausts, under the guide of exhaust structure, high-temperature gas can be followed the exhaust structure department that this module unit corresponds and discharged, discharges from the top of electric core structure promptly, and the heat can not stretch to adjacent module unit, can reduce other module unit thermal runaway's possibility.

In one embodiment, the number of the module units is multiple, and elastic buffer layers are respectively clamped between the adjacent module units and between the module units and the module shell.

When the scheme is adopted, the elastic buffer layer is used for buffering the module unit, particularly when the battery module shakes, the elastic buffer layer can play a role in buffering and protecting the module unit, and the module unit is prevented from being damaged.

In one embodiment, the module housing is provided with an opening facing the exhaust structure, and the opening exposes part or all of the exhaust structure.

When adopting above-mentioned scheme, at least part thermal-insulated roof can not receive the restriction of module casing, and when electric core structure inside production gas flow was strong, can directly break away the thermal-insulated roof that is not restricted by the module casing, can increase exhaust structure to can increase instantaneous discharged gas volume, make high-temperature gas discharge that can be faster.

In one embodiment, the insulating top wall has a pre-crease coinciding with the shape of the inner edge of the opening.

When adopting above-mentioned scheme, when the gaseous outside dashing out that the electric core structure thermal runaway produced, be provided with crease in advance at thermal-insulated roof, gaseous effort makes thermal-insulated roof buckle along crease in advance, makes thermal-insulated roof more easily opened, even gaseous easier discharge.

The utility model also provides a battery pack comprising the battery module.

When the scheme is adopted, the battery module comprises one or more module units, the heat insulation layer in each module unit comprises the heat insulation side wall and the heat insulation top wall which are connected with each other, the side face of the battery cell structure is arranged on the heat insulation side wall, the heat insulation top wall is arranged on the top face of the battery cell structure, and an exhaust structure is formed between the two heat insulation top walls on the top face of the battery cell structure. Under the parcel of insulating layer, make electric core structure be the closed form, each module unit is the closed form promptly, when certain electric core structure thermal runaway exhausts, under the guide of exhaust structure, high-temperature gas can be followed the exhaust structure department that this module unit corresponds and discharged, discharges from the top of electric core structure promptly, and the heat can not stretch to adjacent module unit, can reduce other module unit thermal runaway's possibility, consequently can improve the security that the battery package used.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a side view of a modular unit provided by an embodiment of the present invention;

FIG. 2 is a top view of a module unit according to an embodiment of the present invention;

fig. 3 is a side view of a battery module according to an embodiment of the present invention;

fig. 4 is a side view of a battery module according to an embodiment of the present invention during venting of one of the cell structures;

fig. 5 is a top view of a first battery module according to an embodiment of the present invention;

fig. 6 is a top view of a second battery module according to an embodiment of the present invention;

fig. 7 is a schematic view illustrating a venting direction in a top view of a first battery module according to an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

11-a module unit; 110-electric core; 111-cell structure; 112-a thermal insulation layer; 1121 — insulating sidewalls; 1122-a thermally insulated top wall; 113-a venting structure; 114-a thermally conductive layer; 115-pre-creasing; 12-a module housing; 121-shell base; 122-upper cover; 123-opening a hole; 13-elastic buffer layer.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The module unit 11 according to the embodiment of the present invention will now be described. When the battery cell structure 111 in the module unit 11 is out of control due to heat, the internal heat rises sharply, high-temperature gas can be generated, the high-temperature gas can be exhausted from the pre-designed exhaust port, namely, the module unit 11 can be prevented from exploding due to the exhaust phenomenon. Since a large amount of heat is released during the exhaust process, the heat of the module unit 11 can be prevented from spreading to other module units 11 after the exhaust.

In one embodiment of the present invention, referring to fig. 1 and fig. 2, the module unit 11 includes a cell structure 111 and at least two heat insulating layers 112. Both sides of the cell structure 111 are provided with the thermal insulating layers 112, so that both sides of the cell structure 111 can be thermally isolated from the adjacent cell structure 111, and the thermal spreading speed is reduced. Specifically, the thermal insulation layer 112 includes thermal insulation side walls 1121 and thermal insulation top walls 1122, the thermal insulation side walls 1121 are disposed at the sides of the cell structures 111, and the thermal insulation side walls 1121 are disposed between adjacent cell structures 111, which are main structures for preventing heat from being transferred to another cell structure 111. A thermally insulating top wall 1122 is provided on the top surface of the cell structure 111 to reduce the amount of heat emitted from the top of the module unit 11. Furthermore, the thermal insulation side wall 1121 and the thermal insulation top wall 1122 are connected to each other, and since the thermal insulation side wall 1121 is vertically arranged and the thermal insulation top wall 1122 is horizontally arranged, the thermal insulation layer 112 in this embodiment is in an L-shape. When the insulating side walls 1121 and the insulating top wall 1122 are connected to each other, heat is not emitted from the edges at the top of the cell structure 111. Because both sides of the cell structure 111 are provided with the heat insulating layers 112, the top surface of the cell structure 111 also has two heat insulating top walls 1122, one of the heat insulating top walls 1122 covers one side of the top of the cell structure 111, the other heat insulating top wall 1122 covers the other side of the top of the cell structure 111, and the exhaust structure 113 is provided between the two heat insulating top walls 1122. When the temperature of the cell structure 111 gradually rises to cause thermal runaway, the two heat insulation top walls 1122 are provided to guide the gas to be discharged from the exhaust structure 113, so as to rapidly release a large amount of heat. When the thermal insulation side wall 1121 and the thermal insulation top wall 1122 are connected to each other, the assembly is not required between the two, and the exhaust region of the cell structure 111 can be wrapped in a relatively closed region (except the exhaust structure 113), so that gas can be effectively guided to be exhausted from the exhaust structure 113, and cannot be exhausted from other parts, and therefore high-temperature gas can be prevented from blowing to the adjacent module unit 11, and heat spreading can be avoided.

Module unit 11 in the above-mentioned embodiment includes cell structure 111 and heat insulating layer 112 disposed on both sides of cell structure 111, where heat insulating layer 112 includes heat insulating side wall 1121 and heat insulating top wall 1122 connected to each other, and through locating heat insulating side wall 1121 at the side of cell structure 111, locate heat insulating top wall 1122 at the top surface of cell structure 111, so that exhaust structure 113 is formed between two heat insulating top walls 1122 at the top surface of cell structure 111. Under the parcel of insulating layer 112, make electric core structure 111 be the closure form, when electric core structure 111 thermal runaway exhaust, under exhaust structure 113's guide, high-temperature gas can be followed exhaust structure 113 and is discharged, discharges from electric core structure 111's top promptly, and the heat can not stretch to adjacent module unit 11, can reduce other module unit 11 thermal runaway's possibility.

Optionally, referring to fig. 1, the battery cell structure 111 includes at least one battery cell 110, that is, the battery cell structure 111 may be one battery cell 110, or may be a combination of a plurality of battery cells 110. When the battery cell structure 111 includes a plurality of battery cells 110, the battery cells 110 may be connected in parallel, and in the battery cells 110 connected in parallel, one of the battery cells 110 is out of control due to heat, and the other battery cells 110 are in a failure state, so that the plurality of battery cells 110 connected in parallel may be used as one battery cell structure 111, and the material of the thermal insulation layer 112 is saved.

Optionally, referring to fig. 1, one or more thermal insulation layers 112 may be disposed on the same side of the cell structure 111, and the thermal insulation layers 112 on the same side of the cell 110 may be sequentially arranged along a direction perpendicular to the paper surface. When a plurality of heat insulating layers 112 are arranged on the same side of the cell structure 111, the area of the heat insulating layers 112 is small, the processing is easy, and the cost of raw materials is low. The following description is made of embodiments in which only one thermal insulation layer 112 is disposed on the same side of the cell structure 111.

In one embodiment of the present invention, referring to fig. 2, when two sides of the cell structure 111 are both provided with one heat insulation layer 112, two heat insulation top walls 1122 are provided at the top of the cell structure 111, the two heat insulation top walls 1122 are abutted to each other, and the abutting position between the two heat insulation top walls 1122 is the exhaust structure 113. When two adjacent thermal-insulated roof 1122 butt each other, thermal-insulated roof 1122 is better to the top parcel nature of electric core structure 111, can more effectually prevent that the heat from spreading from the top of module unit 11. In this embodiment, the exhaust structure 113 is in a position corresponding to a dotted line in fig. 2. In another embodiment of the present invention, two heat insulating top walls 1122 are spaced apart from each other to form a space, i.e., the air discharge structure 113. The opposing sidewalls of the two insulated top walls 1122 may be linear, wavy, or zigzag.

When the two heat insulation top walls 1122 at the top of the cell structure 111 are mutually abutted or arranged at intervals, the two heat insulation layers 112 on the two sides of the cell structure 111 are separately arranged, that is, the two heat insulation layers 112 are separately formed, so that high-temperature gas can be discharged from the two heat insulation top walls 1122 arranged in a separated manner. With the two separately molded heat insulating layers 112, high-temperature gas is more easily discharged from the exhaust structure 113 between the two heat insulating top walls 112, and the exhaust structure 113 is also more easily opened by the gas flow. In other embodiments, the two heat insulating layers 112 on the two sides of the cell structure 111 may also be integrally formed, the joint of the two heat insulating top walls 1122 is the exhaust structure 113, at this time, the exhaust structure 113 is a thin-walled structure, when the high-temperature gas rushes out, the air pressure is higher, and the thickness of the thin-walled structure is smaller than the thickness of other portions of the heat insulating layer 112, so that the high-temperature gas may rush through the thin-walled structure and rush out from the thin-walled structure. The thin-wall structure can be arranged in a linear shape, and also can be arranged in a wave shape or a zigzag shape and the like.

In one embodiment of the present invention, referring to fig. 2, the cell structure 111 is flat, the thickness direction of the cell structure 111 is the horizontal direction of the cell structure 111, the heat insulation side wall 1121 of the heat insulation layer 112 covers a larger plane of the cell structure 111, i.e., covers a vertical plane of the cell structure 111, the length direction of the heat insulation top wall 1122 is parallel to the length direction of the top surface of the cell structure 111, and the air discharge structure 113 is also elongated and parallel to the length direction of the top surface of the cell structure 111, so that even if the cell structure 111 is long, heat can be discharged from the corresponding air discharge structure 113, and the heat does not collect at the middle position of the cell structure 111.

Alternatively, the insulation layer 112 may be made of aerogel, mica sheet, ceramic insulation pad, or the like. When the thermal insulation layer 112 is made of a soft material, the thermal insulation top wall 1122 can be lifted by the airflow to be partially or completely separated from the top surface of the cell structure 111. When the heat insulation top wall 1122 is lifted, the exhaust structure 113 is enlarged, instantaneous exhaust gas is increased, and heat of the cell structure 111 can be reduced in an express way, so that heat spreading is prevented. Specifically, referring to fig. 4, after the heat insulating top walls 1122 are lifted under the action of the airflow, the two heat insulating top walls 1122 are in a shape of a Chinese character 'ba', the exhaust structure 113 is changed from a slit shape to a channel shape, that is, the width of the exhaust structure 113 is increased, and the high-temperature gas can be exhausted more quickly.

In one embodiment of the present invention, referring to fig. 1, a heat conducting layer 114 is disposed on a bottom surface of the cell structure 111, and two sides of the heat conducting layer 114 are connected to two heat insulating sidewalls 1121. The heat conducting layer 114 may be made of a heat conducting adhesive, and after the heat insulating layers 112 are disposed on two sides of the cell structure 111, the bottom of the cell structure 111 is filled with the heat conducting adhesive, and after the heat conducting adhesive is cured, the heat conducting adhesive is fixedly connected to the heat insulating side wall 1121 to form an outer layer structure wrapping the cell structure 111. Or, insulating layer 112 and heat-conducting layer 114 integrated into one piece set up, like modes such as integrative injection moulding, under this kind of forming mode, insulating layer 112 and heat-conducting layer 114 can directly form a cuboid structure that has the open-ended, after the shaping, can directly put into this cuboid structure with electric core structure 111, and it is more convenient to install. The arrangement of the heat conduction layer 114 enables the cell structure 111 to dissipate heat quickly through the bottom surface of the cell structure, so that heat cannot be accumulated inside the module unit 11 all the time, and the possibility of thermal runaway of the cell structure 111 is reduced.

A battery module according to an embodiment of the present invention will now be described.

In one embodiment of the present invention, referring to fig. 3, the battery module includes the module unit 11 in any one of the above embodiments, and further includes a module housing 12, wherein the module housing 12 is wrapped around the module unit 11, and the module housing 12 is integrated and protected. The module housing 12 may be made of a steel shell, an aluminum shell, or other hard materials, and may protect the internal cell structure 111 well. The number of the module units 11 may be one or more, and different numbers of module units 11 are selected according to the application scenario of the battery module.

In the battery module in the foregoing embodiment, by using the module unit 11 in the foregoing embodiment, the thermal insulation layer 112 in the module unit 11 includes a thermal insulation side wall 1121 and a thermal insulation top wall 1122 that are connected to each other, and by disposing the thermal insulation side wall 1121 at the side surface of the cell structure 111, the thermal insulation top wall 1122 is disposed at the top surface of the cell structure 111, so that the exhaust structure 113 is formed between the two thermal insulation top walls 1122 at the top surface of the cell structure 111. Under the parcel of insulating layer 112, make electric core structure 111 be the closed form, each module unit 11 is the closed form promptly, when certain electric core structure 111 thermal runaway exhaust, under exhaust structure 113's guide, high-temperature gas can be followed the exhaust structure 113 department that this module unit 11 corresponds and discharged, discharges from the top of electric core structure 111 promptly, and the heat can not stretch to adjacent module unit 11, can reduce other module unit 11 thermal runaway's possibility.

In one embodiment of the present invention, the number of the module units 11 is one, that is, one module unit 11 is provided inside the module housing 12. In this embodiment, since the number of the module units 11 is only one, there is no influence of thermal spread when the cell structure 111 is thermally out of control. In another embodiment of the present invention, the number of the module units 11 is multiple, a plurality of module units 11 are stacked and distributed along one direction, and the top of the module unit 11 always faces the same direction. Because the side of the module unit 11 is provided with the heat insulation layer 112, at least two layers of heat insulation layers 112 are arranged between the adjacent cell structures 111, so that the adjacent cell structures 111 can be sufficiently insulated, and the possibility of heat spreading is further reduced. Moreover, each module unit 11 is closed, can only be followed its top exhaust, and the module unit 11's of thermal runaway heat is most distributed away from the top, has no influence to other module units 11, therefore the heat can not stretch to other module units 11. Specifically, referring to fig. 4, the direction of the arrow in fig. 4 is the direction of the airflow flowing out when thermal runaway occurs, specifically, when the module unit 11 corresponding to the arrow in fig. 4 is in thermal runaway, the high-temperature airflow will rush away the heat insulation top wall 1122, the two corresponding heat insulation top walls 1122 are in a splayed shape, the width of the exhaust structure 113 is correspondingly increased, and the gas is rushed out along the direction indicated by the arrow, i.e., towards the top of the module unit 11, so that the heat will not spread to the adjacent module unit 11.

When the number of module unit 11 is one, be provided with elastic buffer layer 13 between module casing 12 and the module unit 11, elastic buffer layer 13's effect lies in buffering module unit 11, and especially battery module is when rocking, and elastic buffer layer 13 can play the buffering guard action to module unit 11, prevents that module unit 11 from damaging. Referring to fig. 3, when the number of the module units 11 is plural, the elastic buffer layer 13 is disposed between the module housing 12 and the module unit 11, and between the adjacent module units 11, so as to prevent the adjacent module units 11 from being squeezed together, and also prevent the module units 11 from being squeezed together with the module housing 12, so as to buffer and protect the module units 11, and reduce the stress on the module housing 12. It should be noted that the number of the module units 11 is plural, the module units 11 are stacked in the thickness direction thereof, the height direction of the module unit 11 is from the top to the bottom of the module unit 11, and the direction perpendicular to both the height direction and the thickness direction of the module unit 11 is the length direction of the module unit 11.

Alternatively, the elastic buffer layer 13 may be a material having a rebound property, such as foam, a rubber pad, a silicone pad, or the like. Elastic buffer layer 13 of above-mentioned material firstly can be furthest's extrusion, reduces the atress of module unit 11 and module casing 12, secondly can kick-back from the extrusion state very fast, resumes original state fast, prevents next extrusion impact.

In one embodiment of the present invention, the bottom of the module case 12 is provided with a liquid-cooled plate, and the bottom of the module unit 11 has a heat conductive layer 114, and the heat conductive layer 114 and the liquid-cooled plate are in contact with each other. Like this, the heat of electric core structure 111 can be derived fast through heat-conducting layer 114, through the mutual contact of heat-conducting layer 114 and liquid cooling board, makes electric core structure 111's heat can distribute fast, reduces electric core structure 111 thermal runaway's possibility. The number of the liquid cooling plates is multiple, and each heat conduction layer 114 is correspondingly provided with one liquid cooling plate; the number of the liquid-cooled plates may be one, and the liquid-cooled plates are laid on the bottom wall of the module case 12, and each module unit 11 can be in contact with the liquid-cooled plate.

In one embodiment of the present invention, the module case 12 has an insulating layer inside for isolating the module unit 11, preventing the module unit 11 from leaking electricity, and improving the safety of the battery module. More specifically, the top, side, and bottom surfaces of the inner wall of the module case 12 are provided with insulating layers so that the respective portions of the module unit 11 are insulated. The insulating layer can be covered on the inner wall of the module shell 12 through hot pressing, pasting, co-extrusion molding, paint spraying and other modes. The outer wall of the module case 12 may also be covered with an insulating layer to further improve the safety performance of the battery module.

In one embodiment of the present invention, referring to fig. 5 and fig. 6, the module housing 12 is provided with an opening 123 facing the exhaust structure 113, and the shape and the specific distribution of the opening 123 are not limited herein. The opening 123 in the module housing 12 may expose all or a portion of the venting structure 113. Alternatively, the shape and size of the opening 123 may be identical to the vent structure 113. For example, when the air discharge structure 113 has a slit shape, the opening 123 also has a slit shape, and the slit length and the slit width of the air discharge structure 113 and the opening 123 are the same. Or, the size of trompil 123 is greater than exhaust structure 113's size, when exhaust structure 113 is the slot form, the width of trompil 123 is greater than exhaust structure 113's width, like this, at least partial thermal-insulated roof 1122 can not receive the restriction of module casing 12, when the inside gas flow that produces of electricity core structure 111 is strong, can directly break away the thermal-insulated roof 1122 that is not restricted by module casing 12, can increase exhaust structure 113's width, thereby can increase the instantaneous discharged gas volume, make high-temperature gas can discharge more fast.

Referring to fig. 5, fig. 5 is a distribution diagram of the openings 123 of the module housing 12. In fig. 5, the number of the module units 11 in the battery module is plural, and each module unit 11 is correspondingly provided with one air exhaust structure 113. The exhaust structure 113 of each module unit 11 may be partially exposed or may be entirely exposed. In fig. 5, the module housing 12 is provided with a plurality of openings 123 at intervals along the length direction of each module unit 11, so that the exhaust structure 113 of the module unit 11 is exposed at a plurality of positions. Meanwhile, the openings 123 corresponding to the adjacent module units 11 are arranged in a staggered manner, so that the sprayed gas is prevented from affecting the adjacent module units 11.

Referring to fig. 6, fig. 6 is a distribution diagram of the openings 123 of another module housing 12. In fig. 6, the number of the module units 11 in the battery module is plural, and each module unit 11 is correspondingly provided with one air exhaust structure 113. The exhaust structure 113 of each module unit 11 may be partially exposed or may be entirely exposed. In fig. 6, the module housing 12 is provided with a plurality of openings 123 at intervals along the length direction of each module unit 11, so that the exhaust structure 113 of the module unit 11 is exposed at a plurality of positions, and the openings corresponding to each module unit 11 are at the same position in the length direction of the module unit 11, so that the openings 123 corresponding to adjacent module units 11 are communicated with each other in the thickness direction of the module unit 11 and form a long-strip-shaped opening. In this embodiment, the elongated openings provide for easier processing of the module housing 12, a larger exposed area of the top thermally insulating wall 1122, and a larger area from which the gas can be flushed, allowing for a single pass of heat removal.

Optionally, the opening 123 on the module housing 12 is a long hole opened along the length direction, and the number of the long holes is one or more. Specifically, when the module case 12 is provided with elongated holes on the top of the module units 11, the elongated holes may be disposed at intervals, and the width of the interval may be the thickness of one or more module units 11.

Of course, the shape and distribution of the openings 123 are not limited to the above embodiments.

Referring to fig. 7, when one of the module units 11 of the battery pack is out of control due to heat, the top of the module unit 11 is provided with a shielding part such as a module housing 12, so that high-temperature gas cannot be directly sprayed upwards, and under the restriction of the module housing 12, a part of the high-temperature gas is sprayed towards two sides (in the up-down direction in fig. 7) of the opening 123, and then slowly flows out through an assembly gap on the module housing 12.

In one embodiment of the present invention, referring to fig. 3, the module housing 12 includes a housing base 121 and an upper cover 122, the housing base 121 has a receiving cavity, the receiving cavity has an opening, and the upper cover 122 is used for covering the opening. The module units 11 are sequentially arranged inside the accommodating cavity, and the exhaust structure 113 of the module unit 11 is always arranged towards the opening direction, so that the module unit 11 is exhausted through the upper cover 122. In this embodiment, the opening 123 is provided in the upper cover 122 to vent air from the top of the module housing 12.

In one embodiment of the present invention, referring to fig. 5 and 6, the thermal insulating top wall 1122 is provided with a pre-folding mark 115, and the shape of the pre-folding mark 115 is coincident with the shape of the inner edge of the opening 123 of the module housing 12. That is, the projection of the pre-crease 115 of the insulated top wall 1122 on the module housing 12 coincides with the opening 123. Thus, when the gas generated by the thermal runaway of the cell structure 111 is flushed out, the pre-folding lines 115 are provided on the heat-insulating top wall 1122, and the acting force of the gas bends the heat-insulating top wall 1122 along the pre-folding lines 115, so that the heat-insulating top wall 1122 is more easily opened, even if the gas is more easily discharged.

In other embodiments of the present invention, the thermal insulating top wall 1122 is provided with the pre-folding mark 115, and the pre-folding mark 115 is exposed at the opening 123 of the module housing 12. In this way, even when the gas generated by the thermal runaway of the cell structure 111 is flushed out, the heat insulating top wall 1122 can be bent along the pre-folding mark 115, so that the heat insulating top wall 1122 can be lifted more easily, even if the gas is discharged more easily. In this embodiment, the top insulating wall 1122 need not be folded and opened along the inner wall of the opening 123, and may be opened at any position inside the opening 123.

A battery pack provided in an embodiment of the present invention will now be described.

In one embodiment of the present invention, the battery pack includes the battery modules in any of the above embodiments, the number of the battery modules may be multiple, the battery pack may further include a packaging layer wrapped outside the battery modules, and the battery pack is wrapped by the packaging layer to form a whole, and may be applied to products such as electric vehicles.

The battery pack in the above embodiment adopts the battery module in the above embodiment, the battery module includes one or more module units 11, the thermal insulation layer 112 in the module unit 11 includes a thermal insulation side wall 1121 and a thermal insulation top wall 1122 that are connected to each other, the thermal insulation side wall 1121 is disposed on a side surface of the electric core structure 111, and the thermal insulation top wall 1122 is disposed on a top surface of the electric core structure 111, so that the exhaust structure 113 is formed between the two thermal insulation top walls 1122 on the top surface of the electric core structure 111. Under the parcel of insulating layer 112, make electric core structure 111 be the closed form, each module unit 11 is the closed form promptly, when certain electric core structure 111 thermal runaway exhaust, under exhaust structure 113's guide, high-temperature gas can be followed the exhaust structure 113 department that this module unit 11 corresponds and discharged, discharge from the top of electric core structure 111 promptly, the heat can not stretch to adjacent module unit 11, can reduce the possibility of other module unit 11 thermal runaway, consequently, can improve the security that the battery package used.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A modular unit, characterized by: including electric core structure and locate respectively the insulating layer of electric core structure both sides, the insulating layer is including locating the thermal-insulated lateral wall of electric core structure side and locating the thermal-insulated roof of electric core structure top surface, thermal-insulated lateral wall with thermal-insulated roof interconnect, two of electric core structure top surface exhaust structure has between the thermal-insulated roof.

2. The modular unit of claim 1, wherein: two of electricity core structure top thermal-insulated roof butt each other or interval setting.

3. The modular unit of claim 1, wherein: the bottom surface of the electric core structure is provided with a heat conduction layer, and two sides of the heat conduction layer are respectively connected with the two heat insulation side walls.

4. The modular unit of claim 1, wherein: the heat insulation top wall can be separated from the top surface of the battery cell structure under the action of airflow.

5. The modular unit of claim 1, wherein: two of electricity core structure both sides insulating layer integrated into one piece, exhaust structure is thin wall structure.

6. Battery module, its characterized in that: comprising the modular unit of any of claims 1-5, further comprising a modular housing encasing the modular unit.

7. The battery module according to claim 6, wherein: the number of module unit is a plurality of, and adjacent all press from both sides between the module unit, the module unit with be equipped with the elastic buffer layer between the module casing.

8. The battery module according to claim 6, wherein: the module shell is provided with an opening opposite to the exhaust structure, and the opening exposes part or all of the exhaust structure.

9. The battery module according to claim 8, wherein: the heat insulation top wall is provided with a pre-folding mark which is coincident with the shape of the inner edge of the opening.

10. The battery package, its characterized in that: comprising the battery module according to any one of claims 6 to 9.