Anti-expansion device and battery pack

Abstract

The utility model relates to an anti-expansion device and a battery pack. The anti-expansion device comprises an anti-expansion brace and an insulating protective cover, the anti-expansion brace is provided with a body part and an end part, the end part of the anti-expansion brace is mounted on a cross beam of the battery pack, and the insulating protective cover is arranged between the end part and the cross beam. The battery pack is provided with the anti-expansion device. The insulating protective cover is arranged between the end part of the anti-expansion brace and the cross beam of the battery pack, so that under the conditions of thermal runaway and the like of the battery pack, the risk of short circuit or high-voltage sparking and the like caused by metal and other conductive substances sprayed out due to thermal runaway in the battery pack can be reduced by utilizing the insulating protective cover.

Description

TECHNICAL FIELD

[0001] The present application relates to an anti-expansion device and a battery pack having the same. BACKGROUND

[0002] With the development of new energy technology, batteries are widely used in technical fields that require energy storage and power supply.

[0003] During the charging and discharging process of the battery, the battery monomer and the battery pack have a tendency to expand. In order to inhibit the expansion of the battery, an anti-expansion stay such as a steel stay can be provided in the battery pack. However, the provision of the anti-expansion stay in the battery pack can reduce the gap between the conductive members in the battery pack, thereby causing the conductive members to be easily lapped with the box body of the battery pack when the conductive metal material is ejected in the battery pack due to thermal runaway or the like, thereby causing the risk of short circuit. SUMMARY

[0004] In view of the above problems, the present application provides an anti-expansion device and a battery pack having the same, which can reduce the risk of short circuit or high-pressure sparking of the battery pack under the condition of thermal runaway or the like.

[0005] The first aspect of the present application provides an anti-expansion device of a battery pack, the anti-expansion device comprising an anti-expansion stay and an insulating protective cover, the anti-expansion stay having a body portion and an end portion, the end portion of the anti-expansion stay being mounted to a cross beam of the battery pack, and the insulating protective cover being provided between the end portion and the cross beam.

[0006] According to the anti-expansion device of the first aspect of the present application, by providing the insulating protective cover between the end portion of the anti-expansion stay and the cross beam of the battery pack, the risk of short circuit or high-pressure sparking caused by the conductive metal material ejected due to thermal runaway inside the battery pack can be reduced by the insulating protective cover under the condition of thermal runaway or the like of the battery pack.

[0007] In some embodiments, an insulating film is provided on the outer periphery of the body portion of the anti-expansion stay.

[0008] By providing the insulating film on the outer periphery of the body portion of the anti-expansion stay, the risk of short circuit of the anti-expansion stay and other conductive members in the battery pack by the conductive metal material ejected due to thermal runaway can be reduced under the condition of thermal runaway or the like of the battery pack.

[0009] In some embodiments, the end portion of the anti-expansion stay is exposed from the insulating film.

[0010] By exposing the end portion of the anti-expansion stay from the insulating film (i.e., not providing the insulating film at the end portion of the anti-expansion stay), the locking reliability when mounting the end portion of the anti-expansion stay to the beam of the battery pack can be improved.

[0011] In some embodiments, the anti-expansion device further includes a mounting block embedded in the beam, and the end portion of the anti-expansion stay is mounted to the mounting block with the insulating shield sandwiched therebetween.

[0012] By embedding a mounting block in the beam of the battery pack, and mounting the end portion of the anti-expansion stay to the mounting block with the insulating shield sandwiched therebetween, the anti-expansion stay can be more securely mounted to the beam, and the anti-expansion force of the anti-expansion device against the expansion of the battery pack can be improved.

[0013] In some embodiments, the insulating shield has a cylindrical body portion, a base flange extending to the inside of the cylindrical body portion at one end of the cylindrical body portion, and a top flange extending to the outside of the cylindrical body portion at the other end of the cylindrical body portion opposite to the one end provided with the base flange.

[0014] By the insulating shield having a base flange and a top flange, the end portion of the anti-expansion stay can be pressed against the base flange to reliably mount the insulating shield, and in the event of thermal runaway or the like of the battery pack, the risk of short circuit between conductive members in the battery pack or high-voltage sparking or the like can be more reliably reduced by the top flange.

[0015] In some embodiments, the insulating shield further has an intermediate flange located at a height position between the base flange and the top flange in the height direction of the cylindrical body portion, and extending to the outside of the cylindrical body portion on the side of the anti-expansion stay.

[0016] By the insulating shield having an intermediate flange, the body portion of the anti-expansion stay can be pressed against the intermediate flange, thereby further improving the mounting reliability of the insulating shield.

[0017] In some embodiments, the anti-expansion stay further has a connecting portion connecting the body portion and the end portion, and the body portion, the connecting portion, and the end portion are formed in a stepped shape in the thickness direction of the anti-expansion stay.

[0018] By forming the anti-expansion stay such that the body portion, the connecting portion, and the end portion are in a stepped shape in the thickness direction, the insulating shield can be reliably pressed by the anti-expansion stay, thereby improving the mounting reliability of the anti-expansion stay and the insulating shield.

[0019] A second aspect of the present application provides a battery pack, including: a case having a pair of longitudinal beams and a cross beam connecting the pair of longitudinal beams; a battery module arranged by a plurality of battery cells; and an anti-expansion device including an anti-expansion brace having a body portion and an end portion, the end portion of the anti-expansion brace being mounted to the cross beam, and an insulation shield provided between the end portion and the cross beam.

[0020] According to the battery pack of the second aspect of the present application, by providing the insulation shield between the end portion of the anti-expansion brace and the cross beam of the battery pack, in the event of thermal runaway or the like of the battery pack, the risk of short circuit or high-voltage sparking or the like caused by the electrically conductive material such as metal ejected due to thermal runaway inside the battery pack can be reduced using the insulation shield.

[0021] In some embodiments, an insulation film is provided on the outer periphery of the body portion of the anti-expansion brace.

[0022] By providing the insulation film on the outer periphery of the body portion of the anti-expansion brace, in the event of thermal runaway or the like of the battery pack, the risk of short circuit between the anti-expansion brace and other electrically conductive members in the battery pack by the electrically conductive material such as metal ejected due to thermal runaway can be reduced.

[0023] In some embodiments, the end portion of the anti-expansion brace is exposed from the insulation film.

[0024] By exposing the end portion of the anti-expansion brace from the insulation film (i.e., not providing the insulation film on the end portion of the anti-expansion brace), the locking reliability when mounting the end portion of the anti-expansion brace to the cross beam of the battery pack can be improved.

[0025] In some embodiments, the anti-expansion device further includes a mounting block embedded in the cross beam, and the end portion of the anti-expansion brace is mounted to the mounting block with the insulation shield sandwiched therebetween.

[0026] By embedding the mounting block in the cross beam of the battery pack, and mounting the end portion of the anti-expansion brace to the mounting block with the insulation shield sandwiched therebetween, the anti-expansion brace can be more firmly mounted to the cross beam, and the anti-expansion force of the anti-expansion device against the expansion of the battery pack can be improved.

[0027] In some embodiments, the insulation shield has: a cylindrical body portion; a base flange extending to the inside of the cylindrical body portion at one end of the cylindrical body portion; and a top flange extending to the outside of the cylindrical body portion at the other end of the cylindrical body portion opposite to the one end provided with the base flange.

[0028] By the insulating shield having a base flange and a top flange, the end of the anti-expansion brace can press against the base flange to reliably mount the insulating shield, and in the event of thermal runaway of the battery pack or the like, the top flange can more reliably reduce the risk of short circuit between conductive members in the battery pack or high-voltage sparking or the like.

[0029] In some embodiments, the insulating shield further has an intermediate flange at a height position between the base flange and the top flange in the height direction of the cylindrical body portion, and is provided extending to the outside of the cylindrical body portion on the side of the anti-expansion brace.

[0030] By the insulating shield having an intermediate flange, the body portion of the anti-expansion brace can press against the intermediate flange, thereby further improving the mounting reliability of the insulating shield.

[0031] In some embodiments, the anti-expansion brace further has a connecting portion connecting the body portion and the end portion, and the body portion, the connecting portion, and the end portion are formed in a stepped shape in the thickness direction of the anti-expansion brace.

[0032] By forming the anti-expansion brace such that the body portion, the connecting portion, and the end portion are in a stepped shape in the thickness direction, the anti-expansion brace can reliably press against the insulating shield, thereby improving the mounting reliability of the anti-expansion brace and the insulating shield.

[0033] The above description is merely a summary of the technical solutions of the present application. In order to enable one of ordinary skill in the art to better understand the technical means of the present application and implement the same according to the contents of the specification, and in order to enable the above and other purposes, features and advantages of the present application to be more apparent, the following detailed description of the specific embodiments of the present application is provided. BRIEF DESCRIPTION OF DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limiting of the present application. Moreover, in the drawings, like reference numerals denote similar parts throughout the several views. In the drawings:

[0035] Figure 1 is a schematic perspective view of a battery pack and an anti-expansion device mounted therein, which represents some embodiments of the present application, wherein the top cover of the battery pack is removed to show the anti-expansion device therein.

[0036] Figure 2is a schematic plan view showing a battery pack and an anti-expansion device installed therein, which represents some embodiments of the present application, in which a top cover of the battery pack is removed to show the anti-expansion device therein.

[0037] Figure 3 is a schematic perspective view showing an anti-expansion brace in an anti-expansion device, which represents some embodiments of the present application.

[0038] Figure 4 is a schematic perspective view showing a detailed structure of an end portion of an anti-expansion brace in an anti-expansion device, which represents some embodiments of the present application.

[0039] Figure 5 is a schematic perspective view showing an insulation shield in an anti-expansion device, which represents some embodiments of the present application.

[0040] Figure 6 is a schematic partial perspective view showing a vicinity of an end portion of an anti-expansion brace in an anti-expansion device in a state of being installed in a battery pack, which represents some embodiments of the present application.

[0041] Figure 7 is a schematic partial sectional view showing an anti-expansion device, which represents some embodiments of the present application.

[0042] Figure 8 is a schematic partial perspective view showing an anti-expansion device in a state of having an anti-expansion brace removed, which represents some embodiments of the present application, showing an insulation shield and an installation block in the anti-expansion device.

[0043] Figure 9 is a schematic exploded perspective view showing a battery pack, which represents some embodiments of the present application.

[0044] Reference signs in the detailed description of the embodiments are as follows: 1 battery pack, 10 anti-expansion device, 20 battery module, 30 case, 40 top cover, 11 anti-expansion brace, 12 insulation shield, 13 installation block, 14 fastening member, 21 battery cell, 22 high-voltage connector, 31 cross beam, 31a end cross beam, 31b middle cross beam, 32 longitudinal beam, 111 body portion, 112 end portion, 113 connection portion, 114 insulation film, 121 cylindrical body portion, 122 base flange, 123 top flange, 124 middle flange. DETAILED DESCRIPTION

[0045] Embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the description and claims of this application as well as the above discussion of the background of the application, provide examples of the technical features of the application. The terms "comprises," "comprising," "includes," "including" and "has," "having" as used herein, are intended to be interpreted as specifying the presence of the stated features but not precluding the presence of one or more other features in the embodiments described herein. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the description and claims of this application as well as the above discussion of the background of the application, provide examples of the technical features of the application. The terms "comprises," "comprising," "includes," "including" and "has," "having" as used herein, are intended to be interpreted as specifying the presence of the stated features but not precluding the presence of one or more other features in the embodiments described herein.

[0047] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0048] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments to one another. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with one another.

[0049] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. In addition, the technical term "fixed" includes both the state that the parts cannot move relative to each other and the state that the movement of the parts relative to each other is limited and cannot freely move. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] During the charging and discharging process of the battery pack, the battery cells and the battery pack have a tendency to expand. In order to inhibit the expansion of the battery pack, an anti-expansion stay such as a steel stay is usually arranged in the battery pack to limit the expansion of the battery pack. In particular, as the energy density of the battery pack increases, the degree of expansion of the battery pack (the dimensional change amount of expansion or the magnitude of the expansion force) also increases accordingly, and therefore, in order to effectively inhibit the expansion of the battery pack, an anti-expansion stay with a larger cross-sectional size needs to be used to provide a larger pulling force to resist the expansion force of the battery. However, arranging an anti-expansion stay with a larger cross-sectional size in the limited space of the battery pack can further reduce the originally small gap between the conductive members in the battery pack. In this case, when a conductive metal substance is ejected in the battery pack due to thermal runaway or the like, the high-voltage connector is easily connected to the conductive members such as the case of the battery pack, thereby causing a short circuit.

[0051] In order to reduce the risk of the conductive members being connected and short-circuited in the battery pack during thermal runaway or the like while increasing the anti-expansion force of the battery pack, the present application provides an anti-expansion device with an insulation protection function and a battery pack using the anti-expansion device.

[0052] The anti-expansion device of the present application can be applied to various battery devices such as power batteries and energy storage batteries that are prone to expansion during the charging and discharging process. The battery pack of the present application can be used in various devices that use batteries to provide power, such as electric vehicles and portable mobile devices.

[0053] Hereinafter, the anti-expansion device and the battery pack according to the present application will be described in detail with reference to the accompanying drawings.

[0054] Reference Figures 1 to 6 The anti-expansion device 10 of some embodiments of the present application is described. Among them, Figure 1 is a schematic perspective view of a battery pack and an anti-expansion device installed therein according to some embodiments of the present application, wherein the top cover of the battery pack is removed to show the anti-expansion device therein; Figure 2 is a schematic top view of a battery pack and an anti-expansion device installed therein according to some embodiments of the present application, wherein the top cover of the battery pack is removed to show the anti-expansion device therein; Figure 3 is a schematic perspective view of an anti-expansion stay in the anti-expansion device according to some embodiments of the present application; Figure 4 is a schematic perspective view of the detailed structure of the end of the anti-expansion stay in the anti-expansion device according to some embodiments of the present application; Figure 5 is a schematic perspective view of an insulation protection cover in the anti-expansion device according to some embodiments of the present application; Figure 6is a schematic partial perspective view showing the vicinity of an end portion of an anti-expansion brace of an anti-expansion device according to some embodiments of the present application, in a state where the anti-expansion device is installed in a battery pack.

[0055] As shown in Figures 1 to 6 , an anti-expansion device 10 of a battery pack 1 according to some embodiments of the present application includes an anti-expansion brace 11 and an insulating shield 12. The anti-expansion brace 11 has a body portion 111 and an end portion 112. The end portion 112 of the anti-expansion brace 11 is installed to a cross beam 31 of the battery pack 1. The insulating shield 12 is provided between the end portion 112 and the cross beam 31.

[0056] The "battery pack 1" refers to a battery device having a function of storing and releasing electric power, as shown in Figure 1 , 2 , for example. The battery pack 1 includes a battery module 20 and a case 30 that houses the battery module 20.

[0057] The "anti-expansion brace 11" is a substantially long strip-shaped member having a length, a width, and a thickness, which is composed of a material having a certain tensile strength (e.g., a metal such as steel), and is capable of resisting an expansion force of the battery pack 1 by using its own strength, so as to reduce or suppress an amount of deformation of the battery pack 1 due to expansion.

[0058] The "end portion 112" of the anti-expansion brace 11 refers to a portion located at both ends of the long strip-shaped anti-expansion brace 11, which is used to install the anti-expansion brace 11 to the case 30 of the battery pack 1; the "body portion 111" of the anti-expansion brace 11 refers to a main body portion located between the two end portions 112 of the anti-expansion brace 11.

[0059] The "insulating shield 12" is a member composed of a material having electrical insulation, which is used to cover at least a portion of an electrically conductive member in the battery pack 1, so as to reduce a risk of short circuit between the electrically conductive member of the battery pack and the case 30 when the battery pack fails due to thermal runaway or the like.

[0060] The "cross beam 31" is a structural member that constitutes the case 30. As shown in Figure 1 , 2 , for example, the case 30 is formed in a substantially cuboid shape, and has a pair of longitudinal beams 32 extending along a length direction of the cuboid shape, and a cross beam 31 extending along a width direction of the cuboid shape. The cross beam 31 includes a pair of end cross beams 31a, 31a connected to end portions of the pair of longitudinal beams 32, and a middle cross beam 31b connected to a middle portion of the pair of longitudinal beams 32. The battery pack 1 can be provided with one or more middle cross beams 31b, or can be provided with no middle cross beam 31, according to a size or a design requirement, and only the pair of end cross beams 31a, 31a can be provided.

[0061] In Figures 1 to 6In the illustrated example, the end portion 112 of the anti-expansion brace 11 is attached to the crossbeam 31 of the box body 30 using a fastening member 14. The fastening member 14 may be, for example, a bolt, a screw, a rivet, or any other fastening member. Furthermore, the present application is not limited to attaching the end portion 112 to the crossbeam 31 using a fastening member. For example, other attachment methods such as welding may also be used.

[0062] According to the anti-expansion device 10 of the first aspect of the present application, by providing an insulating protective cover 12 between the end 112 of the anti-expansion tie 11 and the crossbeam 31 of the battery pack 1, in the event of thermal runaway of the battery pack 1, the insulating protective cover 12 can be used to reduce the risk of conductive materials such as metal ejected due to thermal runaway causing a short circuit or high-voltage ignition inside the battery pack 1.

[0063] like Figure 5 As shown, according to the anti-expansion device 10 of some embodiments of the present application, optionally, an insulating film 114 is provided on the periphery of the main body 111 of the anti-expansion strip 11 .

[0064] The "insulating film 114" is an insulating layer formed by an electrically insulating material on the periphery of the main body 111 of the anti-expansion tie 11. For example, it can be formed by wrapping a flexible thin film insulating material around the periphery of the main body 111, or by applying a liquid insulating material to the periphery of the main body 111 and then drying the liquid insulating material.

[0065] By providing an insulating film 114 on the periphery of the main body 111 of the anti-expansion strip 11, the risk of the anti-expansion strip 11 and other conductive components in the battery pack 1 being short-circuited by conductive materials such as metal ejected due to thermal runaway can be reduced in the event of thermal runaway of the battery pack 1.

[0066] like Figure 5 As shown, according to the anti-expansion device 10 of some embodiments of the present application, optionally, the end 112 of the anti-expansion strip 11 is exposed from the insulating film 114 (ie, no insulating film is provided at the end 112 of the anti-expansion strip 11).

[0067] like Figure 6 As shown, the end 112 of the anti-expansion strap 11 is fastened to the crossbeam 31 by the fastening member 14. If an insulating film were also provided on the end 112 of the anti-expansion strap 11, there is a risk that the fastening member 14 would easily loosen the fastening of the end 112, thereby reducing the locking effect. Therefore, by not providing an insulating film on the end of the anti-expansion strap, the locking reliability of the end of the anti-expansion strap when attached to the crossbeam of the battery pack can be improved.

[0068] Reference Figure 7 and Figure 8According to the anti-expansion device 10 of some embodiments of the present application, the mounting block 13 is optionally further included, wherein Figure 7 is a schematic partial cross-sectional view showing the anti-expansion device of some embodiments of the present application, wherein the mounting block 13 is shown. Figure 8 is a schematic partial perspective view showing the anti-expansion device 10 of some embodiments of the present application in a state where the anti-expansion brace 11 is removed, showing the insulation shield 12 and the mounting block 13 in the anti-expansion device 10. As shown in Figure 7 and Figure 8 , the mounting block 13 is embedded in the cross beam 31, and the end portion 112 of the anti-expansion brace 11 is installed in the mounting block 13 with the insulation shield 12 sandwiched therebetween.

[0069] As can be seen from the cross-sectional view of Figure 7 , the cross beam 31 of the case 30 of the battery pack 1 generally has a hollow structure, in which case, if the anti-expansion brace is directly installed in the cross beam 31 having a hollow structure, there are certain difficulties, therefore, by providing the mounting block 13 in the cross beam 31, and providing a mounting hole for mounting the anti-expansion brace 11 on the mounting block 13, the end portion 112 of the anti-expansion brace 11 can be easily fastened to the mounting block 13 by the fastening member 14, thereby installing the anti-expansion brace 11 in the cross beam 31.

[0070] Therefore, by embedding the mounting block 13 in the cross beam 31 of the battery pack 1, and installing the end portion 112 of the anti-expansion brace 11 in the mounting block 13 with the insulation shield 12 sandwiched therebetween, the anti-expansion brace 11 can be more easily and securely installed in the cross beam 13, thereby improving the anti-expansion force of the anti-expansion device 10 against the expansion of the battery pack 1.

[0071] As shown in Figure 4 , according to the anti-expansion device 10 of some embodiments of the present application, the insulation shield 12 optionally has a cylindrical body portion 121, a base flange 122 extending to the inside of the cylindrical body portion 121 at one end of the cylindrical body portion 121, and a top flange 123 extending to the outside of the cylindrical body portion 121 at the other end of the cylindrical body portion 121 opposite the one end where the base flange 122 is provided.

[0072] As shown in Figure 4 , the "cylindrical body portion 121" is, for example, a substantially rectangular cylindrical body portion of the insulation shield 12 surrounded by four wall portions arranged upright, but the cylindrical body portion 121 is not limited to the shape shown in Figure 4 , as long as it is formed in a cylindrical shape matching the shape of the end portion 112 of the anti-expansion brace 11.

[0073] The "base flange" is the flange of the insulating protective cover 12 on the side close to the battery module 20, extending from the end of the cylindrical main body 121 on the side close to the battery module 20 (i.e., "one end of the cylindrical main body 121") toward the inner side of the cylindrical main body 121.

[0074] The “top flange” is a flange of the insulating protective cover 12 on the side away from the battery module 20 , and extends from the end of the cylindrical body 121 on the other side opposite to the side close to the battery module 20 toward the outside of the cylindrical body 121 .

[0075] By providing a base flange 122 on the side of the insulating shield 12 that is adjacent to the battery module 20, the end 112 of the anti-expansion tie 11 can be used to press against the base flange 122 when installing the anti-expansion tie 11, thereby enabling convenient and reliable installation of the insulating shield 12. Furthermore, by providing a top flange 123 on the side of the insulating shield 12 that is opposite to the side adjacent to the battery module 20, the top flange 123 can be used to cover the portion of the high-voltage connector 22 (e.g., a copper or aluminum bar) located near the end 112 of the anti-expansion tie 11. Therefore, in the event of thermal runaway of the battery pack 1, the top flange 123 can be used to more reliably reduce the risk of short circuits or high-voltage sparks between the high-voltage connector 22 and conductive components such as the case 30 in the battery pack 1.

[0076] like Figure 4 As shown, according to some embodiments of the anti-expansion device 10 of the present application, optionally, the insulating protective cover 12 further has a middle flange 124. Figure 4 It can be seen that the middle flange 124 is located at a height position between the base flange 122 and the top flange 123 in the height direction of the cylindrical main body 121, and is extended toward the outside of the cylindrical main body 121 on the side of the cylindrical main body 121 facing the anti-expansion strip 11.

[0077] The “height direction of the cylindrical body 121 ” refers to the extending direction of the cylindrical body, and is the same direction as the thickness direction of the anti-expansion brace.

[0078] By providing an intermediate flange 124 in the insulating protective cover 12, when the anti-expansion strip 11 is installed on the crossbeam 31 of the box body 30, that is, when the end 112 of the anti-expansion strip 11 is fastened to the mounting block 13 using the fastening member 14, the middle flange 124 is pressed by the main body 111 of the anti-expansion strip 11, thereby improving the installation reliability of the insulating protective cover 12.

[0079] like Figure 5As shown, according to the anti-expansion device 10 of some embodiments of the present application, the anti-expansion brace 11 optionally further has a connecting portion 113 connecting the body portion 111 and the end portion 112, and the body portion 111, the connecting portion 112 and the end portion 113 are formed in a stepped manner in the thickness direction of the anti-expansion brace 11.

[0080] By providing the connecting portion 112 between the body portion 111 and the end portion 113 of the anti-expansion brace 11, and forming the body portion 111, the connecting portion 112 and the end portion 113 in a stepped manner in the thickness direction of the anti-expansion brace 11, the end portion of the anti-expansion brace 11 can be used to press the base flange 122 of the insulation shield 12, and at the same time, the body portion 111 of the anti-expansion brace 11 can be used to press the middle flange of the insulation shield 12, thereby reliably pressing the insulation shield 12, and further improving the installation reliability of the anti-expansion brace 11 and the insulation shield 12.

[0081] In the following, the battery pack 1 of some embodiments of the present application is described with reference to Figure 1 , Figure 2 and Figure 9 . Among them, Figure 9 is a schematic exploded perspective view of the battery pack of some embodiments of the present application.

[0082] As shown in Figure 1 , 2 and 9, the battery pack 1 of some embodiments of the present application includes a box body 30, a battery module 20 and an anti-expansion device 10. The box body 30 has a pair of longitudinal beams 32 and a cross beam 31 connecting the pair of longitudinal beams 32. The battery module 20 is arranged and configured by a plurality of battery cells 21. The anti-expansion device 10 includes an anti-expansion brace 11 and an insulation shield 12, the anti-expansion brace 11 has a body portion 111 and an end portion 112, the end portion 112 of the anti-expansion brace 11 is installed on the cross beam 31, and the insulation shield 12 is arranged between the end portion 112 and the cross beam 31.

[0083] The "box body 30" is a component for accommodating the battery module 20, which can be formed in a rectangular parallelepiped shape with an opening at the top, and in addition, a top cover 40 can be provided to cover the opening of the box body 30, so as to accommodate the battery module 20 into the space formed by the box body 30 and the top cover 40.

[0084] According to the battery pack 1 of some embodiments of the present application, by adopting the anti-expansion device 10 as described above, in the case of thermal runaway or the like of the battery pack 1, the insulation shield 12 arranged between the end portion 112 of the anti-expansion brace 11 and the cross beam 31 of the battery pack 1 can be used to reduce the risk of short circuit or high-voltage sparking caused by the conductive material such as metal sprayed due to thermal runaway inside the battery pack 1.

[0085] Further, the battery pack 1 of some embodiments of the present application can adopt the anti-expansion device 10 of any of the embodiments described above, and thereby obtain the corresponding technical effects.

[0086] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An anti-expansion device for a battery pack, characterized in that: The anti-expansion device includes an anti-expansion strip and an insulating protective cover. The anti-expansion strip has a main body and an end portion. The end portion of the anti-expansion strip is installed on the crossbeam of the battery pack, and the insulating protective cover is arranged between the end portion and the crossbeam.

2. The anti-expansion device according to claim 1, characterized in that An insulating film is provided on the outer periphery of the main body of the anti-expansion brace.

3. The anti-expansion device according to claim 2, characterized in that The end portion of the anti-expansion tie is exposed from the insulating film.

4. The anti-expansion device according to any one of claims 1 to 3, characterized in that The anti-expansion device further comprises a mounting block, wherein the mounting block is embedded in the crossbeam, and the end portion of the anti-expansion tie bar is mounted on the mounting block by clamping the insulating protective cover.

5. The anti-expansion device according to any one of claims 1 to 3, characterized in that The insulating protective cover comprises: a cylindrical main body; a base flange, wherein the base flange is extended from one end of the cylindrical main body toward the inner side of the cylindrical main body; and a top flange extending outward from the cylindrical body at the other end of the cylindrical body opposite to the end at which the base flange is provided.

6. The anti-expansion device according to claim 5, characterized in that The insulating protective cover also has an intermediate flange, which is located at a height position between the base flange and the top flange in the height direction of the cylindrical main body, and extends toward the outside of the cylindrical main body on the side of the cylindrical main body facing the anti-expansion strip.

7. The anti-expansion device according to claim 6, characterized in that The anti-expansion strip further includes a connecting portion connecting the main body portion and the end portion, and the main body portion, the connecting portion, and the end portion are formed in a stepped shape in a thickness direction of the anti-expansion strip.

8. A battery pack, characterized in that: The battery pack includes: a box body having a pair of longitudinal beams and a transverse beam connecting the pair of longitudinal beams; A battery module, wherein the battery module is composed of a plurality of battery cells arranged in an arrangement; and The anti-expansion device includes an anti-expansion strip and an insulating protective cover. The anti-expansion strip has a main body and an end portion. The end portion of the anti-expansion strip is installed on the crossbeam, and the insulating protective cover is arranged between the end portion and the crossbeam.

9. The battery pack according to claim 8, wherein: An insulating film is provided on the outer periphery of the main body of the anti-expansion brace.

10. The battery pack according to claim 9, wherein: The end portion of the anti-expansion tie is exposed from the insulating film.

11. The battery pack according to any one of claims 8 to 10, wherein: The anti-expansion device further comprises a mounting block, wherein the mounting block is embedded in the crossbeam, and the end portion of the anti-expansion tie bar is mounted on the mounting block by clamping the insulating protective cover.

12. The battery pack according to any one of claims 8 to 10, wherein: The insulating protective cover comprises: a cylindrical main body; a base flange, wherein the base flange is extended from one end of the cylindrical main body toward the inner side of the cylindrical main body; and a top flange extending outward from the cylindrical body at the other end of the cylindrical body opposite to the end at which the base flange is provided.

13. The battery pack according to claim 12, wherein: The insulating protective cover also has an intermediate flange, which is located at a height position between the base flange and the top flange in the height direction of the cylindrical main body, and extends toward the outside of the cylindrical main body on the side of the cylindrical main body facing the anti-expansion strip.

14. The battery pack according to claim 13, wherein: The anti-expansion strip further includes a connecting portion connecting the main body portion and the end portion, and the main body portion, the connecting portion, and the end portion are formed in a stepped shape in a thickness direction of the anti-expansion strip.

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