Battery pack and energy storage device

Abstract

The utility model discloses a battery pack and energy storage equipment, and relates to the technical field of safety of energy storage equipment. The battery pack comprises a box body, a battery module and a box cover assembly, the battery module is arranged in the box body, and the battery module comprises a plurality of single batteries; the box cover assembly comprises a box cover, a fixing assembly and a fireproof plate, the box cover comprises a mounting surface opposite to the box body, the fixing assembly is arranged on the mounting surface, the fixing assembly comprises a first fixing piece and a second fixing piece, the first fixing piece comprises a first folding part and a second folding part, and the first folding part and the second folding part are arranged on the mounting surface. A containing cavity is formed between the first folding part and the second folding part, one end of the fireproof plate extends into the containing cavity, and the other end of the fireproof plate is fixed through the second fixing piece. The fixing assembly for mounting the fireproof plate is arranged on the box cover of the battery pack, so that the fireproof plate can be quickly mounted, and the assembly efficiency of the battery module is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safety of energy storage devices, in particular to a battery pack and an energy storage device. BACKGROUND

[0002] At present, when the fireproof plate of the battery pack is installed, a fixing support is arranged on the end plate of the battery module, a threaded hole or a rivet hole is arranged on the fixing support, and the fireproof plate is fixed by a rivet or a screw. This design requires that all supports be fixed with the module end plate one by one by manual operation in advance, and then the fireproof plate is placed on the plane where all the fixed supports are located by manual operation, and then the fireproof plate is fixed by a rivet or a screw. The process is complex and all operations are manual, and the assembly efficiency is low. SUMMARY

[0003] The embodiments of the present application provide a battery pack and an energy storage device, a fixing assembly for installing a fireproof plate is arranged on the box cover of the battery pack, and the fireproof plate can be quickly installed, so that the assembly efficiency of the battery module is improved.

[0004] The battery pack of the embodiments of the present application comprises a box body, a battery module and a box cover assembly, the battery module is arranged in the box body, the battery module comprises a plurality of battery monomers; the box cover assembly comprises a box cover, a fixing assembly and a fireproof plate, the box cover comprises a mounting surface opposite to the box body, the fixing assembly is arranged on the mounting surface, the fixing assembly comprises a first fixing member and a second fixing member, the first fixing member comprises a first folded portion and a second folded portion, a containing cavity is formed between the first folded portion and the second folded portion, one end of the fireproof plate extends into the containing cavity, and the other end of the fireproof plate is fixed by the second fixing member.

[0005] In some embodiments, the first folded portion and the second folded portion are arranged in a stacked manner in a direction away from the mounting surface, one end of the first folded portion is connected with one end of the second folded portion, the first fixing member further comprises a guide portion, the guide portion is connected with the other end of the first folded portion, and an included angle between the guide portion and the first folded portion is within the interval [120 degrees, 165 degrees].

[0006] In some embodiments, the first fixing member further comprises a third folded portion, the first folded portion, the second folded portion and the third folded portion are arranged in a stacked manner in a direction away from the mounting surface, one end of the second folded portion is connected with one end of the third folded portion; an air layer is formed between the fireproof plate and the mounting surface, and the thickness of the air layer is equal to the spacing between the second folded portion and the mounting surface.

[0007] In some embodiments, the first fixing member further comprises a limiting portion connected to the end of the first folding portion along the width direction of the box and / or connected to the end of the second folding portion along the width direction of the box, the first fixing member and the second fixing member are sequentially arranged along the length direction of the box, and the limiting portion is used for limiting the movement of the fireproof plate in the width direction of the box, wherein the width direction and the length direction are perpendicular.

[0008] In some embodiments, the first fixing member comprises at least two first fixing members, the two first fixing members are sequentially arranged along the width direction, and the limiting portion comprises two limiting portions, wherein the limiting portions of the two first fixing members are respectively located on both sides of the fireproof plate along the width direction.

[0009] In some embodiments, the second fixing member comprises a fixing plate, a stud and a nut, the other end of the fireproof plate is provided with an opening, the opening and the stud are matched in shape, and the nut is screwed with the stud so that the nut and the fixing plate clamp the other end of the fireproof plate.

[0010] In some embodiments, the fixing plate comprises a connecting portion and a fixing portion, the connecting portion is fixedly connected with the mounting surface, an air layer is formed between the fireproof plate and the mounting surface, and the thickness of the air layer is equal to the distance between the fixing portion and the mounting surface.

[0011] In some embodiments, the ratio of the thickness of the air layer to the thickness of the fireproof plate is within the interval [3, 6].

[0012] In some embodiments, the fireproof plate comprises a first fireproof plate and a second fireproof plate, the first fixing member comprises two groups of first fixing members, the two groups of first fixing members are respectively arranged on both sides of the second fixing member, one end of the first fireproof plate extends into the accommodation cavity of one group of the first fixing members, one end of the second fireproof plate extends into the accommodation cavity of the other group of the second fixing members, and the other end of the first fireproof plate and the second fireproof plate is fixed by the second fixing member.

[0013] In some embodiments, the second fixing member comprises a fixing plate, a stud and a nut, the other end of the first fireproof plate is provided with a first opening, the other end of the second fireproof plate is provided with a second opening, the first opening and the second opening are oppositely arranged and surround a mounting hole, the inner diameter of the mounting hole is the same as the outer diameter of the stud, and the nut is screwed with the stud so that the nut and the fixing portion clamp the other end of the first fireproof plate and the second fireproof plate.

[0014] The energy storage device of the present application comprises a cabinet body and the battery pack of any of the above embodiments. The cabinet body comprises a plurality of battery compartments; the battery pack is arranged in the battery compartment.

[0015] In the battery pack and the energy storage device of the embodiments of the present application, a fixing assembly for mounting the fireproof plate is arranged on the box cover of the battery pack. The fixing assembly comprises a first fixing member and a second fixing member for fixing the ends of the fireproof plate respectively. The first fixing member is provided with two folding portions to form a receiving cavity for clamping one end of the fireproof plate, and the second fixing member arranged opposite to the first fixing member is fixedly connected (such as screwed, clamped, etc.) to the other end of the fireproof plate. Since the fixing assembly is directly arranged on the box cover, it can be produced together when the box cover is produced. Compared with manually arranging the fixing bracket on the end plate of each battery module by the assembly personnel, the process of manually installing the fixing assembly on the box cover by the assembly personnel is saved. When assembling the fireproof plate, the assembly personnel only needs to insert one end of the fireproof plate into the receiving cavity and fix the other end, which can realize the quick installation of the fireproof plate and improve the assembly efficiency of the battery pack.

[0016] Additional aspects and advantages of the embodiments of the present application will be in part apparent and in part pointed out hereinafter in the description of the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the embodiments of the present application will become apparent and be readily appreciated from the description of the embodiments, taken in conjunction with the following drawings in which:

[0018] Figure 1 is a perspective exploded schematic view of the battery pack of certain embodiments of the present application.

[0019] Figure 2 is a cross-sectional schematic view of the box cover assembly of certain embodiments of the present application.

[0020] Figure 2a is Figure 2 is a partial enlarged schematic view of area a in

[0021] Figure 2b is Figure 2 is a partial enlarged schematic view of area b in

[0022] Figure 3 is a plan schematic view of the first fixing member of certain embodiments of the present application.

[0023] Figure 4 is a first perspective schematic view of the first fixing member of certain embodiments of the present application.

[0024] Figure 5 is a second perspective schematic view of the first fixing member of certain embodiments of the present application.

[0025] Figure 6 is a first partial structural schematic view of a box cover assembly according to certain embodiments of the present application.

[0026] Figure 7 is a second partial structural schematic view of a box cover assembly according to certain embodiments of the present application.

[0027] Figure 7c is a partial enlarged schematic view of the c region in Figure 7

[0028] Figure 7d is a partial enlarged schematic view of the d region in Figure 7

[0029] Figure 8 is a first perspective schematic view of a second fixing member according to certain embodiments of the present application.

[0030] Figure 9 is a second perspective schematic view of a second fixing member according to certain embodiments of the present application.

[0031] Figure 10 is a perspective structural schematic view of an energy storage device according to certain embodiments of the present application.

[0032] Main element label:

[0033] Energy storage device 1000, battery pack 100, cabinet body 200, battery compartment 201;

[0034] Box cover assembly 10, fixing assembly 11, first fixing member 111, first folding portion 1111, second folding portion 1112, third folding portion 1113, accommodating cavity 1114, guide portion 1115, limiting portion 1116, second fixing member 112, fixing plate 1121, stud 1122, nut 1123, connecting portion 1124, fixing portion 1125, box cover 12, mounting surface 121, fireproof plate 13, first opening 1311, second opening 1312, first fireproof plate 132, second fireproof plate 133, air layer 14;

[0035] Box body 30, bottom wall 31, side wall 32, accommodating space 33;

[0036] Battery module 40, battery monomer 41. DETAILED DESCRIPTION

[0037] The embodiments of the present application will be further described below with reference to the drawings. Identical or similar reference numerals are used throughout the drawings and identical or similar elements or elements having identical or similar functions are denoted with identical or similar reference numerals.

[0038] ​​In addition, the embodiments of the present application described below with reference to the drawings are exemplary only and are intended to explain the embodiments of the present application, and should not be understood as a limitation of the present application.

[0039] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] Please refer to Figure 1 , Figure 2 , Figure 2a , Figure 2b and Figure 3 , the present application provides a battery pack 100, the battery pack 100 includes a box body 30, a battery module 40 and a box cover assembly 10, the battery module 40 is arranged in the box body 30, the battery module 40 includes a plurality of battery monomers 41;The box cover assembly 10 includes a box cover 12, a fixing assembly 11 and a fireproof plate 13, the box cover 12 includes a mounting surface 121 opposite to the box body 30, the fixing assembly 11 is arranged on the mounting surface 121, the fixing assembly 11 includes a first fixing piece 111 and a second fixing piece 112, the first fixing piece 111 includes a first folding part 1111 and a second folding part 1112, a containing cavity 1114 is formed between the first folding part 1111 and the second folding part 1112, one end of the fireproof plate 13 extends into the containing cavity 1114, and the other end of the fireproof plate 13 is fixed through the second fixing piece 112.

[0041] In the battery pack 100 of the embodiment of the present application, on the box cover 12 of the battery pack 100, a fixing assembly 11 for mounting the fireproof plate 13 is arranged, which includes a first fixing piece 111 and a second fixing piece 112 respectively fixed at the two ends of the fireproof plate 13. The first fixing piece 111 is provided with two folding parts, and a receiving cavity 1114 is formed by the two folding parts for clamping one end of the fireproof plate 13. The second fixing piece 112 arranged opposite to the first fixing piece 111 is fixedly connected (such as screwed, clamped, etc.) with the other end of the fireproof plate 13. Since the fixing assembly 11 is directly arranged on the box cover 12, it can be produced together when the box cover 12 is produced. Compared with manually arranging the fixing support on the end plate of each battery module 40 by the assembly personnel, the process of manually installing the fixing assembly 11 to the box cover 12 by the assembly personnel is saved. When assembling the fireproof plate 13, the assembly personnel only needs to insert one end of the fireproof plate 13 into the receiving cavity 1114 and fix the other end, which can realize the quick installation of the fireproof plate 13 and improve the assembly efficiency of the battery pack 100.

[0042] Please refer to Figure 10 The present application provides a kind of energy storage equipment 1000, energy storage equipment 1000 includes battery pack 100 and cabinet 200.Cabinet 200 includes multiple battery compartments 201, battery pack 100 is arranged in battery compartment 201.

[0043] Wherein, battery pack 100 includes box cover assembly 10, box 30 and battery module 40.Battery module 40 is arranged in box 30.Box cover assembly 10 is arranged on box 30, and box cover assembly 10 and box 30 form containing space 33, and battery module 40 is contained in containing space 33.

[0044] Wherein, box 30 includes bottom wall 31 and side wall 32, side wall 32 is arranged on bottom wall 31, and side wall 32, bottom wall 31 and box 12 form containing space 33.

[0045] Optionally, box 30 is usually made of metal (such as steel, aluminum alloy) or high-strength plastic and the like to ensure sufficient strength and durability. When designing, waterproof, dustproof, shockproof and the like need to be considered, and common protection levels include IP65, IP67 and the like. In order to ensure good heat dissipation performance of battery module 40, box 30 is usually designed with a vent hole or a built-in fan and the like heat dissipation system.

[0046] Wherein, battery pack 100 includes multiple battery modules 40.Multiple battery modules 40 are arranged in box 30, and multiple battery modules 40 combine box 30 to form battery pack 100.

[0047] Optionally, the battery module 40 is composed of a plurality of battery monomers 41 combined in series, in parallel, or in a series-parallel hybrid manner. The battery pack 100 is a product further packaged and integrated on the basis of the battery module 40.

[0048] The battery module 40 includes a plurality of battery monomers 41. The plurality of battery monomers 41 can be connected in series and / or in parallel through electrical connectors to form an overall battery module 40. The battery monomer 41 is modularly designed to facilitate replacement or maintenance of the battery monomer 41 when any battery monomer 41 fails (such as hardware failure, thermal runaway, etc.). The battery module 40 forms a power supply circuit with the external load through the total positive and total negative, thereby supplying power. The battery module 40 is the core component of the energy storage device 1000 for energy storage and power supply.

[0049] Optionally, the battery monomer 41 is a rectangular body, and the plurality of battery monomers 41 are arranged in a rectangular array. In this way, the plurality of battery monomers 41 are arranged more compactly, which is conducive to the miniaturization of the energy storage device 1000.

[0050] Optionally, the battery monomer 41 includes a battery shell, a battery core, and an explosion-proof valve. The battery core is arranged in the battery shell, and the explosion-proof valve is arranged in the battery shell.

[0051] The explosion-proof valve is arranged on the surface of the battery shell opposite to the bottom surface of the lid 12, so that the gas sprayed by the explosion-proof valve after pressure relief can be directly sprayed to the fireproof plate 13, thereby blocking the pressure relief gas through the fireproof plate 13 of the lid 12.

[0052] Optionally, the battery pack 100 can be one or more, and one or more battery packs 100 can form a battery cluster (such as the battery packs 100 of the cabinet body 200 of the energy storage device 1000 forming a battery cluster), and the energy storage device 1000 can include one or more battery clusters.

[0053] The lid assembly 10 includes a lid 12, a fixing assembly 11, and a fireproof plate 13. The fireproof plate 13 is installed on the lid 12 through the fixing assembly 11.

[0054] The lid 12 is used to close the accommodation space 33 to isolate the accommodation space 33 from the outside world, so as to prevent dust, conductive substances, etc. from the outside world from entering the accommodation space 33, thereby ensuring the safety and service life of the battery module 40.

[0055] Optionally, the lid 12 is fixedly installed on the cabinet 30; or the lid 12 is detachably installed on the cabinet 30, facilitating subsequent maintenance of the battery module 40.

[0056] The lid 12 includes a mounting surface 121 opposite to the cabinet 30, and the fixing assembly 11 is installed on the mounting surface 121.

[0057] The fixing assembly 11 is a mounting structure for fixing the fireproof plate 13. The fixing assembly 11 comprises a first fixing member 111 and a second fixing member 112.

[0058] Please refer to Figure 4 and Figure 5 The first fixing member 111 is used for fixing one end of the fireproof plate 13. The first fixing member 111 comprises a first folded portion 1111 and a second folded portion 1112. The first folded portion 1111 and the second folded portion 1112 form a receiving cavity 1114 therebetween. One end of the fireproof plate 13 extends into the receiving cavity 1114 and is thus fixed by the first fixing member 111. For example, the first folded portion 1111 and the second folded portion 1112 are connected and have a “u” shape.

[0059] Alternatively, the first folded portion 1111 and the second folded portion 1112 can be integrally formed with the box cover 12. In this way, the first folded portion 1111 and the second folded portion 1112 can be simultaneously provided when the box cover 12 is produced, and manual installation of the first fixing member 111 to the box cover 12 is not required.

[0060] The second fixing member 112 is used for fixing the other end of the fireproof plate 13. For example, the second fixing member 112 can be a mounting hole provided in the box cover 12. A connecting member such as a bolt is used to fix the other end of the fireproof plate 13 to the second fixing member 112. For example, the bolt is inserted through the fireproof plate 13 and is screwed to the mounting hole, so that the other end of the fireproof plate 13 is clamped and fixed between the bolt and the surface of the box cover 12 where the mounting hole is provided.

[0061] Alternatively, the second fixing member 112 can also be integrally formed with the box cover 12. In this way, the second fixing member 112 can be simultaneously provided when the box cover 12 is produced, and manual installation of the second fixing member 112 to the box cover 12 is not required.

[0062] The fireproof plate 13 is a device for preventing high-temperature medium that is ejected from the explosion-proof valve when the battery pack 100 is in thermal runaway from melting through the upper cover of the battery pack 100 or causing electrical breakdown or arc discharge with the metal upper cover of the battery pack 100, resulting in sealing failure of the battery pack 100 and oxygen intrusion into the battery pack 100 to cause fire and explosion.

[0063] In this way, when the fireproof plate 13 is installed, the assembler only needs to extend one end of the fireproof plate 13 into the receiving cavity 1114 of the first fixing member 111 and fix the other end of the fireproof plate 13 by the second fixing member 112. The fireproof plate 13 can be quickly installed on the box cover 12. After the box cover 12 is covered on the box body 30, the assembly of the battery pack 100 is completed, and the assembly efficiency of the battery pack 100 is high.

[0064] In some embodiments, the first folded portion 1111 and the second folded portion 1112 are arranged in a stack, one end of the first folded portion 1111 is connected to one end of the second folded portion 1112, the first fixing member 111 further comprises a guide portion 1115, the guide portion 1115 is connected to the other end of the first folded portion 1111, and an included angle between the guide portion 1115 and the first folded portion 1111 is within the interval [120 degrees, 165 degrees], for example, the included angle is 120 degrees, 125 degrees, 130 degrees, 135 degrees, 145 degrees, 150 degrees, 160 degrees, 165 degrees, etc.

[0065] Specifically, by arranging the first folded portion 1111 and the second folded portion 1112 in a stack, the accommodation cavity 1114 formed by the first folded portion 1111 and the second folded portion 1112 can limit the movement of the fireproof plate 13 in the vertical direction (such as the direction perpendicular to the mounting surface 121 of the box cover 12), avoiding the fireproof plate 13 from colliding with the battery module 40 in the box body 30.

[0066] The first folded portion 1111 is farther away from the mounting surface 121 of the box cover 12 than the second folded portion 1112. The first fixing member 111 further comprises a guide portion 1115, one end of the first folded portion 1111 is connected to one end of the second folded portion 1112, and the guide portion 1115 is connected to the other end of the first folded portion 1111. An included angle between the guide portion 1115 and the first folded portion 1111 (such as Figure 3 The illustrated α) is within the interval [120 degrees, 165 degrees].

[0067] In this way, by arranging the guide portion 1115 and the included angle being a relatively appropriate obtuse angle, the fireproof plate 13 can be guided by the guide portion 1115 to quickly extend into the accommodation cavity 1114 between the first folded portion 1111 and the second folded portion 1112, and will not interfere with the fixing assembly 11, avoiding damage to the fireproof plate 13 or the fixing assembly 11 during installation, thereby achieving quick installation of one end of the fireproof plate 13.

[0068] In some embodiments, the first fixing member 111 further comprises a third folded portion 1113, and the first folded portion 1111, the second folded portion 1112, and the third folded portion 1113 are arranged in a stack in a direction away from the mounting surface 121, and one end of the second folded portion 1112 and the third folded portion 1113 is connected.

[0069] Specifically, by arranging the third folded portion 1113 in a stack with the first folded portion 1111 and the second folded portion 1112, the third folded portion 1113 is the component closest to the mounting surface 121 of the box cover 12, the third folded portion 1113 can be used to be fixed with the mounting surface 121 of the box cover 12, or the third folded portion 1113 is part of the mounting surface 121 of the box cover 12, thereby facilitating the integration of the first fixing member 111 and the box cover 12.

[0070] A gap is set between the second folding part 1112 and the mounting surface 121. On the one hand, an air layer 14 can be formed between the fireproof board 13 and the box cover 12 to achieve effective heat insulation. On the other hand, it can also ensure that the second folding part 1112 and the third folding part 1113 have enough space to bend and form smoothly.

[0071] Optionally, an air layer 14 is formed between the fireproof board 13 and the mounting surface 121, and the thickness of the air layer 14 is equal to the distance between the second fold 1112 and the mounting surface 121.

[0072] Because a certain gap is formed between the third folding part 1113 and the second folding part 1112, when one end of the fireproof plate 13 is installed into the accommodating cavity 1114, it will be supported by the second folding part 1112. The second folding part 1112 is separated from the mounting surface 121 of the cover 12 by the third folding part 1113, thereby forming an air layer 14 between the fireproof plate 13 and the mounting surface 121 of the cover 12. The thickness of the air layer 14 in the direction perpendicular to the mounting surface 121 is the gap. Thus, by forming an air layer 14 between the fireproof plate 13 and the cover 12, the heat insulation performance of the battery pack 100 is improved.

[0073] In some embodiments, the first fixing member 111 further includes a limiting portion 1116, which is connected to the first folding portion 1111 and / or the second folding portion 1112. For example, the limiting portion 1116 is connected to the end of the first folding portion 1111 along the width direction of the housing 30, or the limiting portion 1116 is connected to the end of the second folding portion 1112 along the width direction of the housing 30, or the limiting portion 1116 is connected to both the end of the first folding portion 1111 and the end of the second folding portion 1112 along the width direction of the housing 30.

[0074] The first fixing member 111 and the second fixing member 112 are along the length direction of the housing 30 (e.g., ...). Figure 7 The fireproof board 13 is sequentially arranged in the y-direction (as shown), and the limiting part 1116 is used to limit the fireproof board 13 in the width direction of the housing 30 (e.g., in the y-direction). Figure 7 The movement in the x-direction (as shown) is limited, and the width and length directions are perpendicular.

[0075] Specifically, the first folding part 1111 and the second folding part 1112 can achieve vertical positioning, while the fireproof board 13 may also move horizontally. Therefore, it is necessary to limit the horizontal movement of the fireproof board 13.

[0076] By setting the limiting part 1116 on the first fixing part 111, the limiting part 1116, the first folding part 1111 and the second folding part 1112 enclose the accommodating cavity 1114. For example, the limiting part 1116 is connected with the first folding part 1111, and the limiting part 1116 can be a flange set on the end of the first folding part 1111 in the width direction; or the limiting part 1116 is connected with the second folding part 1112, and the limiting part 1116 can be a flange set on the end of the second folding part 1112 in the width direction.

[0077] In this way, after the fireproof plate 13 extends into the accommodating cavity 1114, in the vertical direction, the first folding part 1111 and the second folding part 1112 limit the fireproof plate 13, and in the horizontal width direction, the limiting part 1116 limits the fireproof plate 13, so that the fireproof plate 13 is limited in all directions and is firmly fixed.

[0078] Optionally, the first fixing part 111 can extend in the width direction to form the accommodating cavity 1114 with a width matching the width of the fireproof plate 13, and the limiting part 1116 includes two limiting parts 1116 respectively set on the two ends of the first fixing part 111 in the width direction, so as to limit the fireproof plate 13 in the width direction.

[0079] Please refer to Figure 6 Optionally, the first fixing part 111 includes at least two first fixing parts 111, and the two first fixing parts 111 are sequentially arranged in the width direction, and the limiting part 1116 includes two limiting parts 1116, which are respectively located on the two sides of the fireproof plate 13 in the width direction.

[0080] Specifically, one first fixing part 111 can be arranged corresponding to each end of the fireproof plate 13 in the width direction, and the two ends of the fireproof plate 13 extend into the accommodating cavities 1114 of the corresponding first fixing parts 111. In this way, the middle region between the two ends of the fireproof plate 13 does not need to be provided with the first fixing part 111, so that the volume occupied by the first fixing part 111 can be reduced.

[0081] Correspondingly, in order to limit the fireproof plate 13 in the width direction, two limiting parts 1116 need to be respectively arranged on the two first fixing parts 111, and the limiting parts 1116 of the two first fixing parts 111 are respectively located on the two sides of the fireproof plate 13 in the width direction, that is, the limiting part 1116 is arranged on the end of the first fixing part 111 away from the middle region of the fireproof plate 13.

[0082] Please refer to Figure 7 , Figure 7c , Figure 7d , Figure 8 and Figure 9In some embodiments, the second fixing member 112 includes a fixing plate 1121, a stud 1122 and a nut 1123. The other end of the fireproof plate 13 is provided with an opening, the opening and the stud 1122 are matched in shape, and the nut 1123 is screwed with the stud 1122, so that the nut 1123 and the fixing plate 1121 clamp the other end of the fireproof plate 13.

[0083] The stud 1122 is arranged on the fixing plate 1121, the fixing plate 1121 is arranged on the mounting surface 121 of the box cover 12, or the fixing plate 1121 and the stud 1122 are integrally formed with the box cover 12. The nut 1123 can be installed on the stud 1122 after the production of the box cover 12. When assembling the fireproof plate 13, the assembler only needs to unscrew the nut 1123, install the fireproof plate 13 on the fixing plate 1121, and then screw the nut 1123 with the stud 1122, so that the nut 1123 and the fixing plate 1121 firmly clamp the other end of the fireproof plate 13. The assembler does not need to additionally prepare the nut 1123, and the installation experience is better.

[0084] The other end of the fireproof plate 13 (i.e. the end of the fireproof plate 13 opposite to the end connected with the first fixing member 111) is provided with an opening 131, and the opening 131 is matched in shape with the stud 1122 (for example, the shape of the opening 131 is matched with the projection shape of the stud 1122 on the mounting surface 121, for example, the stud 1122 is a cylindrical shape, and the opening 131 is a circular shape, a semicircular shape, etc.), so that the fireproof plate 13 can be combined with the stud 1122 more closely, not only can be fixed, but also can limit the other end of the fireproof plate 13.

[0085] Optionally, the fixing plate 1121 includes a connecting portion 1124 and a fixing portion 1125. The connecting portion 1124 is fixedly connected with the mounting surface 121, and an air layer 14 is formed between the fireproof plate 13 and the mounting surface 121. The thickness of the air layer 14 is equal to the spacing between the fixing portion 1125 and the mounting surface 121.

[0086] It can be understood that, in order to form the air layer 14 for fireproofing, the spacing between the fireproof plate 13 and the mounting surface 121 of the box cover 12 can be set to be uniform. Therefore, the fixing plate 1121 is provided with the connecting portion 1124 connected with the mounting surface 121, and the fixing portion 1125 arranged on the connecting portion 1124. The fixing portion 1125 is used for bearing the fireproof plate 13. Therefore, the first spacing (for example, d3 as shown in the figure) between the bearing surface of the fixing portion 1125 and the mounting surface 121 needs to be the same as the second spacing (for example, d1 as shown in the figure) between the second folding portion 1112 and the mounting surface 121, so that the air layer 14 with a fixed thickness is formed between the fireproof plate 13 and the mounting surface 121. Figure 8 Figure 3 It can be understood that, in order to form the air layer 14 for fireproofing, the spacing between the fireproof plate 13 and the mounting surface 121 of the box cover 12 can be set to be uniform. Therefore, the fixing plate 1121 is provided with the connecting portion 1124 connected with the mounting surface 121, and the fixing portion 1125 arranged on the connecting portion 1124. The fixing portion 1125 is used for bearing the fireproof plate 13. Therefore, the first spacing (for example, d3 as shown in the figure) between the bearing surface of the fixing portion 1125 and the mounting surface 121 needs to be the same as the second spacing (for example, d1 as shown in the figure) between the second folding portion 1112 and the mounting surface 121, so that the air layer 14 with a fixed thickness is formed between the fireproof plate 13 and the mounting surface 121.

[0087] ​Optionally, the ratio of the thickness of the air layer 14 to the thickness of the fireproof plate 13 is within the interval [3, 6], for example, the ratio can be 3, 4, 5, 6, etc.

[0088] In this way, the thickness of the air layer 14 is appropriate, which can improve the heat insulation effect of the air layer 14 formed between the fireproof plate 13 and the box cover 12, and also ensure that the second folding part 1112 and the third folding part 1113 have enough space to be smoothly bent and formed.

[0089] Please refer to Figure 6 and Figure 7 In some embodiments, the fireproof plate 13 includes a first fireproof plate 132 and a second fireproof plate 133, the first fixing part 111 includes two groups of first fixing parts 111, the two groups of first fixing parts 111 are respectively arranged on the two sides of the second fixing part 112, one end of the first fireproof plate 132 extends into the accommodation cavity 1114 of one group of first fixing parts 111, one end of the second fireproof plate 133 extends into the accommodation cavity 1114 of the other group of second fixing parts 112, and the other end of the first fireproof plate 132 and the second fireproof plate 133 is fixed by the second fixing part 112.

[0090] Specifically, the fireproof plate 13 can be designed in a split type, and the fireproof plate 13 includes a first fireproof plate 132 and a second fireproof plate 133. In order to realize the installation of the first fireproof plate 132 and the second fireproof plate 133, the first fixing part 111 includes two groups of first fixing parts 111, and the two groups of first fixing parts 111 are respectively arranged on the two sides of the second fixing part 112, and the second fixing part 112 is arranged between the two groups of first fixing parts 111.

[0091] One end of the first fireproof plate 132 extends into the accommodation cavity 1114 of one group of first fixing parts 111, and the other end of the first fireproof plate 132 is fixed by the second fixing part 112; one end of the second fireproof plate 133 extends into the accommodation cavity 1114 of the other group of second fixing parts 112, and the other end of the second fireproof plate 133 can also be fixed by the second fixing part 112.

[0092] Optionally, taking the second fixing member 112 including the fixing plate 1121, the stud 1122 and the nut 1123 as an example, the other end of the first fireproof plate 132 and the second fireproof plate 133 needs to cooperate with the stud 1122, for example, the other end of the first fireproof plate 132 is provided with a first opening 1311, and the other end of the second fireproof plate 133 is provided with a second opening 1312, both the first opening 1311 and the second opening 1312 are semicircular, after the first fireproof plate 132 and the second fireproof plate 133 are both cooperated with the stud 1122, the first opening 1311 and the second opening 1312 are oppositely arranged and enclose a circular mounting hole, the inner diameter of the mounting hole is basically the same as the outer diameter of the stud 1122, so that the opposite ends of the first fireproof plate 132 and the second fireproof plate 133 can be spliced together, and after the first fireproof plate 132 and the second fireproof plate 133 are spliced together, there is basically no gap, thereby avoiding the problem that the protection effect is reduced after the gap exists in the fireproof plate 13.

[0093] After the first opening 1311 of the first fireproof plate 132 and the second opening 1312 of the second fireproof plate 133 are both mounted to the stud 1122, the first fireproof plate 132 and the second fireproof plate 133 are spliced together, and then the nut 1123 is screwed with the stud 1122, so that the nut 1123 is continuously close to the first fireproof plate 132 and the second fireproof plate 133 through screwing, until the nut 1123 can be fixed by the first fireproof plate 132 and the second fireproof plate 133 through the clamping of the fixing portion 1125, thereby realizing the fixation of the other end of the first fireproof plate 132 and the second fireproof plate 133.

[0094] In the description of the present specification, the description referring to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0095] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one feature. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, unless otherwise specifically limited.

[0096] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made by those skilled in the art without departing from the scope of the present application, which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized by, The battery pack comprises: a box body; a battery module arranged in the box body, the battery module comprising a plurality of battery cells; and a box cover assembly comprising a box cover, a fixing assembly and a fireproof plate, the box cover comprising a mounting surface opposite to the box body, the fixing assembly being arranged on the mounting surface, the fixing assembly comprising a first fixing member and a second fixing member, the first fixing member comprising a first folded portion and a second folded portion, a receiving cavity being formed between the first folded portion and the second folded portion, one end of the fireproof plate extending into the receiving cavity, and the other end of the fireproof plate being fixed by the second fixing member.

2. The battery pack of claim 1, wherein, In a direction away from the mounting surface, the first folded portion and the second folded portion are arranged in a stack, one end of the first folded portion being connected to one end of the second folded portion, the first fixing member further comprising a guide portion, the guide portion being connected to the other end of the first folded portion, and an included angle between the guide portion and the first folded portion being within an interval [120 degrees, 165 degrees].

3. The battery pack of claim 2, wherein, The first fixing member further comprises a third folded portion, in a direction away from the mounting surface, the first folded portion, the second folded portion and the third folded portion are arranged in a stack, one end of the second folded portion being connected to one end of the third folded portion; an air layer being formed between the fireproof plate and the mounting surface, a thickness of the air layer being equal to a spacing between the second folded portion and the mounting surface.

4. The battery pack of any one of claims 1-3, wherein, The first fixing member further comprises a limiting portion, the limiting portion being connected to an end of the first folded portion along a width direction of the box body, and / or the limiting portion being connected to an end of the second folded portion along the width direction of the box body, the first fixing member and the second fixing member being sequentially arranged along a length direction of the box body, the limiting portion being used for limiting movement of the fireproof plate in the width direction of the box body, the width direction being perpendicular to the length direction.

5. The battery pack of claim 4, wherein, The first fixing member comprises at least two, the two first fixing members being sequentially arranged along the width direction, and the limiting portion comprises two, the limiting portions of the two first fixing members being respectively located on two sides of the fireproof plate along the width direction.

6. The battery pack of claim 1, wherein, The second fixing member comprises a fixing plate, a stud and a nut, the other end of the fireproof plate being provided with an opening, the opening and the stud being shape-matched, and the nut being screwed with the stud so that the nut and the fixing plate clamp the other end of the fireproof plate.

7. The battery pack of claim 6, wherein, The fixing plate comprises a connecting portion and a fixing portion, the connecting portion being fixedly connected with the mounting surface, an air layer being formed between the fireproof plate and the mounting surface, and a thickness of the air layer being equal to a spacing between the fixing portion and the mounting surface.

8. The battery pack of claim 3 or 7, wherein, A ratio of the thickness of the air layer to the thickness of the fireproof plate is within an interval [3, 6].

9. The battery pack of claim 1, wherein, The fireproof plate comprises a first fireproof plate and a second fireproof plate, the first fixing member comprises two groups of the first fixing member, the two groups of the first fixing member are respectively arranged on two sides of the second fixing member, one end of the first fireproof plate extends into a containing cavity of one group of the first fixing member, one end of the second fireproof plate extends into a containing cavity of the other group of the second fixing member, and the other end of the first fireproof plate and the second fireproof plate is fixed by the second fixing member.

10. The battery pack of claim 9, wherein, The second fixing member comprises a fixing plate, a stud and a nut, the other end of the first fireproof plate is provided with a first opening, the other end of the second fireproof plate is provided with a second opening, the first opening and the second opening are oppositely arranged and surround a mounting hole, the inner diameter of the mounting hole is the same as the outer diameter of the stud, and the nut is screwed with the stud so that the nut and the fixing part clamp the other end of the first fireproof plate and the second fireproof plate.

11. An energy storage device, characterized by, Comprise: a cabinet body comprising a plurality of battery compartments; a plurality of battery packs according to any one of claims 1-10 arranged in the battery compartments.

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