CN220544077U - Battery pack and vehicle - Google Patents

Abstract

The utility model discloses a battery pack and a vehicle, wherein the battery pack comprises: a battery; the tray is provided with a containing cavity, the battery is arranged in the containing cavity, the inner wall of the tray is provided with an insulating layer, and the insulating layer is at least opposite to the bottom wall of the battery; the adhesive layer is arranged between the bottom wall of the battery and the insulating layer and is used for bonding and connecting the battery and the insulating layer. Therefore, the battery is adhered and fixed on the insulating layer through the adhesive layer, so that the connection reliability of the battery and the tray can be improved, the insulating performance of the battery pack can be improved through the arrangement of the insulating layer, and the safety and the reliability of the battery pack are improved.

Description

Battery pack and vehicle

Technical Field

The utility model relates to the field of vehicles, in particular to a battery pack and a vehicle.

Background

The exterior of the battery in the battery pack is generally covered with an insulating material, and the battery is further fixed by bonding the insulating material with the case.

In the related art, as the temperature of the battery increases during use, the insulating material ages. After the insulating material ages for a certain time, the fixing effect of the battery in the shell is affected, so that the use safety of the battery pack cannot be guaranteed.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a battery pack in which the reliability of battery connection is high.

The utility model further provides a vehicle.

According to an embodiment of the first aspect of the present utility model, a battery pack includes: a battery; the tray is provided with a containing cavity, the battery is arranged in the containing cavity, the inner wall of the tray is provided with an insulating layer, and the insulating layer is at least opposite to the bottom wall of the battery; the adhesive layer is arranged between the bottom wall of the battery and the insulating layer and is used for bonding and connecting the battery and the insulating layer.

According to the battery pack disclosed by the embodiment of the application, the battery is adhered and fixed on the insulating layer through the adhesive layer, so that the connection reliability of the battery and the tray can be improved, the insulating performance of the battery pack can be improved through the arrangement of the insulating layer, and the safety and the reliability of the battery pack are further improved.

According to some embodiments of the utility model, the battery pack further comprises an insulating film, wherein the insulating film is coated on the battery, and the insulating film is avoided from the bottom wall of the battery.

According to some embodiments of the utility model, the plurality of the batteries are arranged in the accommodating cavity in sequence along the first direction, and each of the batteries is coated with the insulating film.

According to some embodiments of the utility model, the battery is configured as a cuboid, and a terminal post is arranged at the end of the battery in the second direction, and the insulating film avoids the terminal post; wherein the first direction is perpendicular to the second direction.

According to some embodiments of the utility model, a wall surface of the accommodating cavity opposite to the pole is provided with the insulating layer, and the insulating layer and the pole are opposite to each other in the second direction.

According to some embodiments of the utility model, the insulating film is a PET film.

According to some embodiments of the utility model, the insulating layer is configured as an insulating coating applied to the inner wall of the tray (21).

According to some embodiments of the utility model, the top end of the receiving cavity is open, and the bottom wall and the side walls of the tray are both provided with the insulating layer.

According to some embodiments of the utility model, the battery pack further comprises a cover plate, wherein the cover plate covers the tray to close the accommodating cavity.

According to a vehicle of an embodiment of the second aspect of the present utility model, the vehicle includes the above-described battery pack.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

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

fig. 2 is a schematic diagram showing the cooperation of an insulating film and a battery according to an embodiment of the present utility model;

fig. 3 is a cross-sectional view of a battery pack according to an embodiment of the present utility model.

Reference numerals:

a battery pack 100;

a battery 10; a pole 11;

a tray 21; an insulating layer 211; a receiving chamber 212; a bottom wall 2121; a sidewall 2122; a cover plate 22;

an adhesive layer 30; an insulating film 40.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

A battery pack 100 according to an embodiment of the present utility model is described below with reference to fig. 1 to 3.

The battery pack 100 according to the embodiment of the present utility model includes: battery 10, tray 21, and adhesive layer 30.

The battery 10 may be configured as a battery cell or a battery module, and referring to fig. 1, the battery 10 is described herein as an example of a battery cell.

Referring to fig. 1, the tray 21 is formed with a receiving chamber 212, the battery 10 is disposed in the receiving chamber 212, and an insulating layer 211 is provided on an inner wall of the tray 21, and the insulating layer 211 has good insulating properties, so that the insulating properties of the tray 21 can be improved.

Referring to fig. 3, insulating layer 211 is disposed at least opposite bottom wall 2121 of battery 10. The adhesive layer 30 is provided between the bottom wall 2121 of the battery 10 and the insulating layer 211, and serves to adhesively bond the battery 10 to the insulating layer 211 to fix the battery 10 in the tray 21.

It will be appreciated that the adhesive layer 30 is used to secure the battery 10 to the tray 21. Referring to fig. 3, one side surface of the adhesive layer 30 is adhesively coupled to the insulating coating layer and the other side surface is adhesively coupled to the bottom wall 2121 of the battery 10, thereby coupling the battery 10 to the tray 21 through the adhesive layer 30 to improve the coupling reliability of the battery 10 to the tray 21.

In the related art, in order to improve the safety performance of the battery 10, an insulating material (e.g., an insulating film 40, etc.) is generally used to completely cover the battery 10. When the battery 10 needs to be connected to the housing, the insulating material needs to be connected to the housing, and after the battery pack 100 is used for a period of time, there is a risk that the insulating material ages to cause separation of the bonding interface between the battery 10 and the insulating material, which affects the fixing effect of the battery 10 in the housing.

In the present application, the battery 10 is directly adhered and fixed to the insulating layer 211 by the adhesive layer 30, so that the connection reliability between the battery 10 and the tray 21 is high, the influence of the insulating material coated outside the battery 10 is not required, and the problem that the battery 10 is not reliably fixed due to the aging of the insulating material can be avoided.

Further, the battery 10 is fixed to the tray 21 by the adhesive layer 30 in the present application, and at the same time, the insulating performance of the battery pack 100 is improved by forming the insulating layer 211 on the wall surface of the tray 21. The insulating layer 211 is disposed opposite to the bottom wall 2121 of the battery 10, so that the insulating performance of the tray 21 can be improved, and the battery 10 can be prevented from being in contact with the tray 21 made of a metal material to cause short circuit or the like.

According to the battery pack 100 of the embodiment of the application, the battery 10 is adhered and fixed on the insulating layer 211 through the adhesive layer 30, so that the connection reliability of the battery 10 and the tray 21 can be improved, and the insulating layer 211 can improve the insulating performance of the battery pack 100.

In some embodiments of the present utility model, the battery pack 100 further includes an insulating film 40, where the insulating film 40 wraps the battery 10, and the insulating film 40 is away from the bottom wall 2121 of the battery 10, so that the insulating film 40 can expose the bottom wall 2121 of the battery 10, and facilitate adhesion and fixation of the bottom wall 2121 of the battery 10 and the insulating layer 211 through the adhesive layer 30.

Among them, the insulating film 40 has good insulating properties, and can improve the insulating properties of the battery 10, preventing short circuits from occurring between the batteries 10.

It is understood that the insulating film 40 is coated on the battery 10, and does not coat the bottom wall of the battery 10. The insulating film 40 may completely avoid the bottom wall, so that the bottom wall (i.e., the wall surface of the battery opposite to the insulating layer 211) is completely exposed, and the insulating film 40 may also partially avoid the bottom wall, i.e., a portion of the insulating film 40 is still disposed between the bottom wall of the battery 10 and the insulating layer 211, so that the requirement for connecting the battery 10 and the insulating layer 211 can be met.

As shown in fig. 3, in a further embodiment of the present utility model, a plurality of batteries 10 are sequentially arranged in the accommodating cavity 212 along the first direction, and each battery 10 is covered with an insulating film 40, where the insulating film 40 is configured to sufficiently improve the insulating performance of the battery 10 and prevent a short circuit between the batteries 10 and 10.

It should be noted that the arrangement of the cells 10 is not limited thereto, and may be arranged in a plurality of rows and columns.

Referring to fig. 3, when each of the batteries 10 is coated with the insulating film 40, the insulating film 40 is sufficiently adhered to the outer case of the battery 10 to sufficiently protect the battery 10 and to enhance the insulating performance of the outer circumferential surface of the battery 10.

As shown in fig. 1, in the embodiment of the present utility model, the battery 10 is constructed in a rectangular parallelepiped, and the end of the battery 10 in the second direction is provided with a post 11, and the insulating film 40 is provided to avoid the post 11, so that the battery 10 is electrically connected through the post 11. Wherein the first direction is perpendicular to the second direction.

Referring to fig. 1, 2 and 3, the first direction may be a thickness direction configured as the battery 10, and the second direction is a length direction of the battery 10. Among them, the insulating film 40 may cover five surfaces of the battery 10, that is, five surfaces of the battery 10 constructed in a rectangular parallelepiped except the bottom wall 2121, so that the bottom wall 2121 may be conveniently connected to the insulating layer 211 by the adhesive layer 30 and the battery 10 may be sufficiently insulated in various directions.

It can be appreciated that in the present application, the battery 10 is directly bonded to the insulating layer 211 through the bottom wall 2121 so as to be fixed on the tray 21, so that the connection effect between the battery 10 and the tray 21 can be ensured, and meanwhile, the insulating performance of the battery 10 on the bottom wall 2121 side is improved, and the bottom wall 2121 side of the battery 10 is insulated and protected through the insulating layer 211.

Wherein, the bottom wall 2121 of the battery 10 is used for being connected and matched with the tray 21, and the insulation film 40 covers the other surfaces except the bottom wall 2121 of the battery 10, so that the insulation performance of the outer surface of the battery 10 can be improved, and the short circuit caused by the contact between the outer shell of the battery 10 and the conductive piece in the accommodating cavity 212 is prevented.

In a further embodiment of the present utility model, the wall surface of the tray 21 opposite to the pole 11 is provided with the insulating layer 211, and the insulating layer 211 is opposite to and spaced from the pole 11 in the second direction, so that the insulating performance of the battery pack 100 can be further improved, and the probability of thermal runaway of the battery pack 100 can be reduced.

It can be understood that the number of batteries (cells) in the CTP structure battery pack is large, in the existing assembly process, each battery will be further arranged on the tray after being coated with the insulating film, if the battery is conducted with the tray due to insulation failure, the tray will become a high-potential charged body, and under the high-voltage clamping, the risk of arcing or breakdown will occur at the position with lower failure risk in the battery pack. Further, if high temperature occurs in the battery pack due to arc discharge, thermal runaway and the like, the polymers such as the insulating film, the adhesive layer and the like positioned outside the battery shrink or decompose and carbonize under heating, so that the insulation protection in the battery pack is invalid, and a new arc discharge or thermal runaway result is caused. Among them, the results of researches related to thermal runaway indicate that when the battery pack contains a plurality of batteries, the risk occurrence probability is higher due to a certain pressure difference between the double-layered batteries.

In some embodiments of the utility model, referring to fig. 1 and 3, the top end of tray 21 is open and both bottom wall 2121 and side wall 2122 of tray 21 are provided with insulating layer 211.

In this application, by providing the insulating layer 211 on the inner peripheral wall (including the bottom wall 2121 and the side wall 2122) of the tray 21, the insulating performance at the tray 21 is sufficiently improved, and even if the polymer such as the insulating film 40, the adhesive layer 30, etc. shrinks or decomposes due to the high temperature generated by the thermal runaway of the battery 10, the insulating layer 211 formed on the tray 21 can prevent the battery 10 from being conducted with the tray 21 to further induce a new round of arc discharge or thermal runaway.

Wherein the high voltage circuit in the battery pack 100 is generally formed at a vicinity of the post of the battery 10, i.e., a region adjacent to the side wall 2122 of the tray 21. The battery pack 100 has extremely high risk of arc discharge near both ends where the potential difference is largest, and the high temperature of arc discharge can ignite plastic structural members or melt insulating members in the pack, so that short circuit occurs between the high and low voltage area batteries 10 through the metal structural members to continue arc discharge, or the batteries 10 are directly caused to bear high voltage, and the risk of thermal runaway fire caused by breakdown exists. The inner Zhou Biquan direction (including the metal area near the high-voltage loop) of the tray 21 in the application is coated with an insulating coating, and the insulating layer 211 can increase the creepage distance or the electrical clearance between the main positive main negative side of the battery 10 and the metal nearby, so that the high-voltage safety of the battery pack 100 is ensured.

As shown in fig. 1, in some embodiments of the present utility model, the battery pack 100 further includes a cover 22, where the cover 22 may be covered on the tray 21 to close the accommodating cavity 212, so that the cover 22 may cover the components (such as the battery 10) in the accommodating cavity 212, thereby improving the reliability and safety of the battery pack 100.

Further, a sealing structure is arranged between the cover plate 22 and the tray 21, and the sealing structure can seal the cover plate 22 and the tray 21, so that the sealing effect of the accommodating cavity 212 is improved. The sealing structure may be a sealant, a sealing ring, or the like, and is not particularly limited herein.

In some embodiments of the present utility model, the insulating film 40 is a PET (polyethylene terephthalate ) film, which is a high temperature resistant polyester film having the advantages of creep resistance, fatigue resistance, and abrasion resistance, and is less affected by temperature, so that the insulating performance of the battery 10 can be ensured.

In some embodiments of the present utility model, the insulating layer 211 is formed on the tray 21 through a coating process to form the insulating layer 211 on the inner peripheral wall of the tray 21. The insulating layer 211 may be formed of a material having good insulating properties and structural strength, and the insulating layer 211 may be made of a material that adheres well to the adhesive layer 30, so as to improve the connection reliability between the battery 10 and the insulating layer 211.

It should be noted that, the insulating layer 211 may ensure high-voltage safety of the battery pack 100, for example, when the battery pack 100 formed by a plurality of ternary lithium batteries has thermal diffusion, the highest temperature in the battery pack 100 may reach 800 ℃, while in the embodiment of the present utility model, the insulating layer 211 capable of withstanding high temperature is disposed in a risk area and a risk portion of the battery pack 100, which is prone to high-voltage arcing, for example, an organic ceramic coating capable of withstanding high temperatures above 1000 ℃ is adopted, and a proper coating thickness (for example, 0.1 mm-2 mm) is selected, so that the dense insulating layer 211 may ensure that the insulating performance of the battery pack 100 may remain stable and reliable even if the insulating film 40 has grinding and local rupture, and insulation failure caused by thermal shrinkage of the insulating film 40 after thermal diffusion and thermal runaway may be avoided, so as to further inhibit the thermal diffusion speed, improve the safety and reliability of the battery pack 100, and effectively delay secondary accidents.

It should be noted that, the insulating layer 211 needs to have a certain mechanical strength and thickness to prevent the insulating layer 211 from being crushed or pierced by the battery 10 (such as the burr structure on the bottom wall 2121) or foreign matters, so as to ensure the insulation protection effect of the insulating layer 211. Meanwhile, the thickness and the material of the insulating layer 211 in the present application are not particularly limited herein, and the above parameters may be adjusted according to the processing technology of the insulating layer 211.

In some embodiments of the present utility model, the adhesive layer 30 may be formed of a structural adhesive that is strong, resistant to load, aging, fatigue, and corrosion, to ensure the adhesion of the adhesive layer 30 over the expected lifetime. The adhesive layer 30 may be formed of an adhesive having insulating properties to further insulate the bottom wall 2121 of the battery 10.

It will be appreciated that when thermal runaway occurs in the battery 10, the adhesion effect of the adhesive layer 30 will be affected, and the battery pack 100 may be insulated by the insulating layer 211 to prevent a new arc discharge or thermal runaway.

In this application, the insulation protection between the bottom wall 2121 of the battery 10 and the tray 21 may be achieved by the adhesive layer 30 and the insulation layer 211 (the insulation layer 211 provided on the bottom wall 2121 of the tray 21). The high-voltage circuit side inside the battery pack 100 and the tray 21 may be insulated by an insulating protective cover (e.g., a plastic protective cover) or by attaching an insulating protective film (e.g., a PET film, a mica tape, etc.).

Further, the insulating layer 211 is also disposed on the side wall 2122 of the tray 21 in the present application, so that the high-voltage safety performance of the battery pack 100 can be improved by insulating protection through the insulating layer 211 disposed near the high-voltage circuit of the battery 10 in addition to conventional protection through the insulating protective cover.

The assembly process of the battery pack 100 in the embodiment of the present application is described with reference to fig. 1 to 3:

after the tray 21 is sufficiently cleaned, an insulating layer 211 needs to be formed in advance by spraying in the accommodating cavity 212 of the tray 21, structural adhesive is coated on the insulating layer 211 at the position where the insulating layer 211 is used for being in adhesive fit with the battery 10, the battery 10 wrapped with the insulating film 40 is assembled into the tray 21, pressure maintaining is performed for a certain time under the action of a pressure maintaining tool, and the cover plate 22 can be assembled after corresponding offline testing, so that the complete battery pack 100 is formed.

In this application, the bottom wall 2121 of the battery 10 is directly connected to the insulating layer 211 through the adhesive layer 30, so that the adhesive strength of the adhesive interface is high, the adhesive effect between the adhesive layer 30 and the battery 10 can be ensured, and the problem that the battery pack 100 is unreliable in fixing the battery 10 due to aging of the insulating film 40 is avoided. Meanwhile, the insulation film 40 insulates the other surfaces of the battery 10 (other surfaces except the bottom wall 2121 for adhesion), so that the insulation performance of the battery 10 is fully improved, and the safety and reliability of the battery pack 100 are further improved.

It should be noted that the thickness, material and coating range of the insulating coating can be selected according to practical requirements. Specifically, the weight of the battery 10, the voltage range of the battery pack 100, the dielectric properties and mechanical strength of the coating itself can be comprehensively considered to improve the anti-breakdown capability of the coating, and the wall surface coating is crushed or pierced by the battery 10 (such as burrs on the battery 10) or foreign matters.

According to the vehicle provided by the embodiment of the utility model, the vehicle comprises the battery pack 100, the battery 10 in the battery pack 100 is high in assembly reliability, and the battery pack 100 has good insulating performance, so that the risk of safety accidents can be reduced, and the safety of the vehicle is improved.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the utility model, a "first feature" or "second feature" may include one or more of such features.

In the description of the present utility model, "plurality" means two or more.

In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.

In the description of the utility model, 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 indicates that the first feature is higher in level than the second feature.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A battery pack, comprising:

a battery (10);

the battery pack comprises a tray (21), wherein the tray (21) is provided with a containing cavity (212), the battery (10) is arranged in the containing cavity (212), an insulating layer (211) is arranged on the inner wall of the tray (21), and the insulating layer (211) is at least opposite to a bottom wall (2121) of the battery (10);

and an adhesive layer (30), wherein the adhesive layer (30) is arranged between the bottom wall (2121) of the battery (10) and the insulating layer (211) and is used for bonding and connecting the battery (10) and the insulating layer (211).

2. The battery pack according to claim 1, further comprising an insulating film (40), wherein the insulating film (40) is wrapped around the battery (10), and wherein the insulating film (40) is recessed from a bottom wall (2121) of the battery (10).

3. The battery pack according to claim 2, wherein the plurality of the batteries (10) is provided, the plurality of the batteries (10) are arranged in the housing chamber (212) in order along the first direction, and each of the batteries (10) is covered with the insulating film (40).

4. A battery pack according to claim 3, wherein the battery (10) is configured as a rectangular parallelepiped, and the battery (10) is provided with a post at an end in the second direction, the insulating film (40) being led away from the post;

wherein the first direction is perpendicular to the second direction.

5. The battery pack according to claim 4, wherein a wall surface of the accommodation chamber (212) disposed opposite to the pole is provided with the insulating layer (211), and the insulating layer (211) is disposed opposite to the pole in the second direction.

6. The battery pack according to claim 2, wherein the insulating film (40) is a PET film.

7. The battery pack according to claim 1, wherein the insulating layer (211) is configured as an insulating coating applied to an inner wall of the tray (21).

8. The battery pack according to claim 1, wherein the top end of the tray (21) is open, and both the bottom wall (2121) and the side wall (2122) of the tray (21) are provided with the insulating layer (211).

9. The battery pack according to claim 8, further comprising a cover plate (22), the cover plate (22) being provided to cover the tray (21) to close the accommodation chamber (212).

10. A vehicle characterized by comprising the battery pack according to any one of claims 1 to 9.