Battery pack

Abstract

The utility model provides a battery pack which comprises a battery pack, a sleeve and a welding piece, the battery pack comprises end faces oppositely arranged in the first direction and a peripheral face arranged around the first direction, the sleeve wraps the peripheral face of the battery pack in a thermal shrinkage mode, at least one end, in the first direction, of the sleeve is an open end, and an opening is formed in the open end; the welding sheet is in hot melting connection with the opening end to seal the opening, and the sleeve forms a closed structure after the opening is sealed by the welding sheet, so that the sealing of the battery pack in the sleeve is realized. The hot melting connection between the welding piece and the open end of the sleeve is high in reliability and firmer, the hot melting connection is not easily interfered by the external environment, and the welding piece and the sleeve are not easily loosened under the condition of long-term use, so that the condition of sealing failure of the sleeve can be effectively avoided, and the service life of the sleeve is prolonged. The battery pack in the sleeve can be well protected, and the performance and the service life of the battery pack can be guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery pack, in particular to a battery pack. BACKGROUND

[0002] The rapid development of the new energy industry has driven the demand for battery packs in the market. A battery pack includes a box body and a battery pack, etc. The battery pack is arranged in the box body, and the battery pack is used for charging and discharging function to serve as a power source for various electrical equipment. During the preparation of the battery pack, the battery pack needs to be sealed to prevent water vapor, dust, etc. from entering the battery pack box body, causing corrosion of the battery pack.

[0003] At present, most of the battery packs on the market use waterproof foam to seal the battery pack by bonding the waterproof foam to the end face of the battery pack. However, the adhesion of the waterproof foam will continuously weaken under the influence of the environment, resulting in a risk of sealing failure of the battery pack during long-term use. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the present application provides a battery pack to at least solve the problem of easy sealing failure of the battery pack in the prior art during long-term use.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0006] The present application provides a battery pack, comprising: a battery pack, the battery pack having a first direction, the battery pack comprising an end face arranged opposite along the first direction, and an outer peripheral surface arranged around the first direction; a sleeve, heat-shrunk on the outer peripheral surface, at least one end of the sleeve along the first direction being an open end, the open end being provided with an opening; and a fusion sheet, heat-fused with the open end to seal the opening.

[0007] Optionally, the opening is located in the central region of the open end, the open end is further provided with a flange, the flange is located on the side of the opening, and the flange is heat-fused with the fusion sheet.

[0008] Optionally, the edge position of the fusion sheet is provided with a fusion part, the fusion part is heat-fused with the flange, and the fusion part serves as a positioning function before heat-fusion.

[0009] Optionally, both ends of the sleeve along the first direction are open ends, the number of the fusion sheets is two, and the two fusion sheets are heat-fused with the two open ends one by one.

[0010] Optionally, the battery pack further has a second direction and a third direction, the first direction, the second direction and the third direction intersect with each other; the outer peripheral surface comprises a top wall and a bottom wall, the top wall and the bottom wall are oppositely arranged along the third direction; the battery pack further comprises a control board arranged on one side of the battery pack along the third direction; the control board is provided with a connecting wire for electrically connecting with an external power consumption device, the welding sheet is provided with a wire passing hole, and the connecting wire extends from the wire passing hole.

[0011] Optionally, the wire passing hole penetrates the outer edge of the welding sheet, and the hole wall of the wire passing hole is coated with adhesive.

[0012] Optionally, the battery pack comprises a support and a plurality of battery monomers; the plurality of battery monomers are arranged in the support in a stacked manner, and the support is used for fixing the plurality of battery monomers; the support has a cuboid structure, and the support is provided with a reinforcing sheet at a corner portion.

[0013] Optionally, the reinforcing sheet has an arc structure, and the arc structure is curved towards the plurality of battery monomers; and / or the reinforcing sheet and the support are an integral piece.

[0014] Optionally, the outer peripheral surface further comprises two side walls, and the two side walls are oppositely arranged along the second direction; the battery pack further comprises a busbar arranged on at least one of the side walls and connected with the plurality of battery monomers, and an insulating layer connected to the two side walls, and the insulating layer is used for realizing insulation between the two side walls and the sleeve.

[0015] Optionally, the welding sheet and the sleeve are made of the same material, and / or the welding sheet and the sleeve have the same thickness.

[0016] Compared with the prior art, the battery pack has the following advantages:

[0017] The battery pack comprises a battery pack, a sleeve and a welding sheet, the battery pack comprises end surfaces oppositely arranged along a first direction and an outer peripheral surface arranged around the first direction, the sleeve is heat-shrunkly wrapped on the outer peripheral surface of the battery pack, at least one end of the sleeve along the first direction is an open end, the open end is provided with an opening, and the welding sheet is heat-welded with the open end to seal the opening. After the welding sheet seals the opening, the sleeve forms a closed structure, thereby realizing sealing of the battery pack in the sleeve. In the application, the welding sheet is heat-welded with the open end of the sleeve, which has high reliability and firm connection, and the heat-welding connection is not easily affected by the external environment. In the case of long-term use, the welding sheet and the sleeve are not prone to loosening, thereby effectively avoiding the sealing failure of the sleeve and protecting the battery pack in the sleeve, which helps to protect the performance and service life of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application. The application illustratively described in the detailed description will be apparent to those skilled in the art from this

[0019] Figure 1 is a schematic view of an appearance of a battery pack in an embodiment of the present application;

[0020] Figure 2 is an exploded view of a structure of a battery pack in an embodiment of the present application;

[0021] Figure 3 is a schematic view of a sleeve covering an outer circumferential surface of a battery pack in an embodiment of the present application;

[0022] Figure 4 is a schematic view of a welding sheet in an embodiment of the present application;

[0023] Figure 5 is an enlarged schematic view of a wire passing hole part of a welding sheet in an embodiment of the present application;

[0024] Figure 6 is a schematic view of a battery pack in an embodiment of the present application;

[0025] Figure 7 is Figure 6 a partial enlarged schematic view of part A in FIG. 1.

[0026] Explanation of Reference Numerals:

[0027] 1 - battery pack, 11 - end surface, 12 - outer circumferential surface, 121 - top wall, 122 - bottom wall, 123 - side wall, 13 - bracket, 14 - battery cell, 15 - reinforcing sheet, 2 - sleeve, 21 - open end, 22 - opening, 23 - flange, 3 - welding sheet, 31 - welding part, 32 - wire passing hole, 4 - control board, 41 - connecting wire, 5 - bus bar, 6 - insulating layer;

[0028] X - first direction, Y - second direction, Z - third direction. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0030] The terms "first", "second", and the like in the description and in the claims of the present application are used for distinguishing between similar objects and are not necessarily used to describe a particular sequential or chronological order. It is to be understood that the use of the terms so construed can interchange depending on the context in which it is used, and that the embodiments of the present application are well suited to perform different orders of operations than those described herein without departing from the essence of the embodiments of the application. The aforementioned "and / or" when used in the context of the conjunction of a list of items, indicates that at least one of the items, and can also mean many of the items and / or all of the items in the list of items. The use of "and / or" in the claims is merely intended to introduce alternative selecting terms connecting the conditions of a listed set of alternatives. The use of the term "about" followed by a number in the description and claims is intended to refer to that number + / - 10% of that number.

[0031] It is to be understood that the terminology "some embodiments", "other embodiments" or "one embodiment" throughout the description and the claims is merely used to describe a certain feature or combination of features in connection with an embodiment or a combination of the embodiments. Thus, each "some embodiments", "other embodiments" or "one embodiment" is intended to represent one or more embodiments of the application with respect to a particular feature or combination of features, but is not intended to represent an entirety of embodiments of the application nor each and every embodiment of the application. In addition, the features or combinations of features described with respect to some embodiments can be combined with features or combinations of features described with respect to other embodiments, even though the features or combinations of features are described with respect to different embodiments.

[0032] A battery pack provided by the present application is described in detail below by listing specific embodiments.

[0033] Figure 1 is a schematic view of an appearance of a battery pack in an embodiment of the present application, Figure 2 is an exploded view of a structure of a battery pack in an embodiment of the present application, Figure 3 is a schematic view of a sleeve covering an outer peripheral surface of a battery pack in an embodiment of the present application, please refer to Figures 1 to 3 The present application provides a battery pack, comprising: a battery pack 1, the battery pack 1 having a first direction, the battery pack 1 comprising an end surface 11 oppositely arranged along the first direction, and an outer peripheral surface 12 arranged around the first direction; a sleeve 2, the sleeve 2 being heat-shrinkably wrapped on the outer peripheral surface 12, at least one end of the sleeve 2 along the first direction being an open end 21, the open end 21 being provided with an opening 22; and a fusion sheet 3, the fusion sheet 3 being heat-fusedly connected with the open end 21 to seal the opening 22.

[0034] In the present embodiment, the battery pack further comprises a box body, the battery pack 1, the sleeve 2, the fusion sheet 3 and the like are arranged in the box body, the box body can be processed by hard aluminum, steel and its alloy and the like, has good strength and rigidity, can protect the battery pack 1, the sleeve 2, the fusion sheet 3 and the like in the inside thereof, and prolong the service life thereof. The battery pack 1 comprises a plurality of battery monomers 14, the plurality of battery monomers 14 are connected in series or in parallel with each other to form a charging and discharging unit of the battery pack. Figure 2 In the battery pack shown in the figure, the plurality of battery monomers 14 are cylindrical batteries, of course, in other battery packs, the plurality of battery monomers 14 can also be square columnar batteries.

[0035] The battery pack 1 has a first direction, a second direction and a third direction, the first direction is shown as the X direction in Figures 1 to 3 , the second direction is shown as the Y direction in Figures 1 to 3 , and the third direction is shown as the Z direction in Figures 1 to 3 , the first direction X, the second direction Y and the third direction Z are perpendicular to each other, and in the battery pack shown in Figures 1 to 3 , the first direction X, the second direction Y and the third direction Z are perpendicular to each other, wherein "perpendicular" not only includes the case of absolute perpendicular, but also includes the case of approximately perpendicular as generally recognized, such as the state that the included angle between the first direction X, the second direction Y and the third direction Z is 89°-91°, all of which are considered as the first direction X, the second direction Y and the third direction Z being perpendicular to each other.

[0036] Figure 2 In the battery pack shown in , the battery pack 1 has a cuboid structure, and the battery pack 1 includes an end surface 11 arranged opposite along the first direction X, and an outer peripheral surface 12 arranged around the first direction X, and the sleeve 2 is heat-shrunkly covered on the outer peripheral surface 12 of the battery pack 1, specifically, the sleeve 2 is a heat-shrinkable sleeve 2, which is a thermoplastic material product, when heated to a certain temperature, the internal polymer molecular chain will rearrange and generate a shrinkage force, so as to tightly cover the outer peripheral surface 12 of the battery pack 1 to form a protective layer. During the heat-shrinking process of the sleeve 2, problems such as wrinkles, bubbles and gaps can be effectively avoided, thereby improving the sealing effect of the battery pack 1. At the same time, the sleeve 2 has strong adaptability to the environment, can be used under different temperature and pressure conditions, and has good corrosion resistance, so as to better protect the battery pack 1 and maintain the normal work of the battery pack 1.

[0037] Figure 3 At least one end of the sleeve 2 along the first direction X is an open end 21, and the open end 21 is provided with an opening 22, the size of the opening 22 along the second direction Y and along the third direction Z is greater than the size of the end surface 11 of the sleeve 2 along the second direction Y and along the third direction Z, and during the preparation of the battery pack, the battery pack 1 is placed into the sleeve 2 from the opening 22, and then the sleeve 2 is heated to be heat-shrunkly covered on the outer peripheral surface 12 of the battery pack 1, and the battery pack in which the sleeve 2 is heat-shrunkly covered on the outer peripheral surface 12 of the battery pack 1 is shown in .

[0038] The welding piece 3 is hot-melt connected with the open end 21 of the sleeve 2. After the welding piece 3 is connected with the open end 21 of the sleeve 2, the opening 22 can be sealed, so that the sleeve 2 has a closed structure. The welding piece 3 can be connected with the open end 21 of the sleeve 2 by a hot-melt connection technology. The hot-melt connection technology melts the material by heating, and then combines two or more melted surfaces together under the action of pressure, and forms a firm connection after cooling. The welding piece 3 can be made of plastic materials such as polytetrafluoroethylene (PTFE), high-density polyethylene (HDPE), ethylene-vinyl acetate copolymer (EVA), or can be made of metal materials such as aluminum, copper and stainless steel, or can be made of composite materials. The specific setting is based on the needs of the battery pack, and the present embodiment is not limited.

[0039] The battery pack of the present application comprises a battery pack 1, a sleeve 2 and a welding piece 3. The battery pack 1 comprises an end surface 11 arranged opposite in a first direction and an outer peripheral surface 12 arranged around the first direction. The sleeve 2 is heat-shrinkable wrapped on the outer peripheral surface 12 of the battery pack 1. At least one end of the sleeve 2 in the first direction is an open end 21. The open end 21 is provided with an opening 22. The welding piece 3 is hot-melt connected with the open end 21 to seal the opening 22. After the welding piece 3 seals the opening 22, the sleeve 2 forms a closed structure, realizing the sealing of the battery pack 1 in the sleeve 2. The hot-melt connection of the welding piece 3 with the open end 21 of the sleeve 2 in the present application has high reliability and firm connection. The hot-melt connection is not easily disturbed by the external environment. In the case of long-term use, the welding piece 3 and the sleeve 2 are not prone to loosening, thereby effectively avoiding the sealing failure of the sleeve 2, and playing a good protective role for the battery pack 1 inside the sleeve 2, helping to protect the performance and service life of the battery pack 1.

[0040] Please continue to refer to Figure 2 and Figure 3 In some optional embodiments, the opening 22 is located in the central region of the open end 21. The open end 21 is also provided with a flange 23. The flange 23 is located on the periphery of the opening 22. The flange 23 is hot-melt connected with the welding piece 3.

[0041] The opening 22 is located in the central region of the open end 21, i.e. the opening 22 is located in the central region of the open end 21 along the second direction Y and along the third direction Z. The flange 23 is located on the periphery of the opening 22. The flange 23 and the sleeve 2 can be an integral part formed by injection molding, so as to improve the synchronism of the flange 23 and the sleeve 2 when they are heated and shrunk. Figure 2 and Figure 3In the shown battery pack, part of the flange 23 is arranged to extend in the second direction Y and part of the flange 23 is arranged to extend in the third direction Z, wherein the flange 23 can be connected to each other to form a complete annular structure, or the flange 23 can be disconnected once or multiple times to form multiple short flanges 23 arranged at intervals. If the flange 23 is in a complete annular structure, the strength and rigidity of the flange 23 is higher, and the stability of the open end 21 of the sleeve 2 is higher, which is more conducive to improving the reliability of the hot melt connection between the welding sheet 3 and the sleeve 2. If the flange 23 is formed by multiple short flanges 23 arranged at intervals, the flange 23 has better deformation ability, which is more convenient for the battery pack 1 to be put into the sleeve 2 from the opening 22, and is not easy to cause the phenomenon of jamming during the process of putting the battery pack 1.

[0042] In addition, the size of the flange 23 in the second direction Y or the third direction Z is about 3mm-10mm. It can be understood that the larger the size of the flange 23, the smaller the area of the opening 22, which is easy to cause the battery pack 1 to be unable to be put into the opening 22, but the contact area between the flange 23 and the welding sheet 3 is larger, which is helpful to improve the connection reliability between the flange 23 and the welding sheet 3. Correspondingly, the smaller the size of the flange 23, the larger the area of the opening 22, which is more conducive to the smooth putting of the battery pack 1, but is easy to affect the connection reliability between the flange 23 and the welding sheet 3. Therefore, the size of the flange 23 can be reasonably set according to the size of the open end 21 of the sleeve 2 and the size of the end surface 11 of the battery pack 1, so as to avoid the above phenomenon.

[0043] Figure 4 is a schematic view of a welding sheet in the embodiment of the present application, please refer to Figure 4 In some optional embodiments, the edge position of the welding sheet 3 is provided with a welding portion 31, the welding portion 31 is hot melt connected with the flange 23 of the open end 21 of the sleeve 2, and the welding portion 31 is used for pre-positioning before hot melt connection.

[0044] The welding portion 31 is a part of the edge position of the welding sheet 3, and the welding portion 31 is used for pre-positioning in the process of hot melt connection between the welding sheet 3 and the flange 23. For example, the welding portion 31 can be divided on the welding sheet 3 by using a line, and the welding portion 31 can be embodied on the welding sheet 3 by using different colors, patterns, etc. The specific mode is not limited in the embodiment. Figure 4 The area between the two dashed boxes in the welding portion 31 of the welding sheet 3 is in the form of an annular structure, which is matched with the shape structure of the flange 23 of the open end 21 of the sleeve 2, and can be fully hot melt connected with the flange 23. It should be noted that the thickness of the welding portion 31 is consistent with the thickness of other parts of the welding sheet 3, so as to avoid affecting the hot melt connection effect between the welding sheet 3 and the flange 23.

[0045] Please continue to refer to Figure 2 and Figure 3In some optional embodiments, the sleeve 2 has two open ends 21 along the first direction, and the number of the fusion pieces 3 is two, and the two fusion pieces 3 are hot melt connected with the two open ends 21 one by one.

[0046] In the embodiment, the sleeve 2 has two open ends 21 along the first direction, each open end 21 is provided with an opening 22, and the sizes of the two openings 22 are substantially the same to ensure that the battery pack 1 can be smoothly put into the opening 22. In the case of two open ends 21, the number of the fusion pieces 3 is also two, and one fusion piece 3 is hot melt connected with one open end 21. In the embodiment, the sleeve 2 is provided with two open ends 21, which can facilitate the putting of the battery pack 1. When the battery pack 1 is put in, the operator does not need to pay special attention to the placement direction of the sleeve 2, and the putting can be realized from any one of the open ends 21, thereby helping to improve the preparation efficiency of the battery pack. On the other hand, it is convenient for the hot shrinking process of the sleeve 2. In the hot shrinking process of the sleeve 2, the sleeve 2 will shrink inward along the radial direction to cover the battery pack 1. If only one end of the sleeve 2 is provided with an open end 21, due to the existence of the opening 22, the resistance of the open end 21 in the hot shrinking process is smaller, while the resistance of the other end opposite to the open end 21 in the hot shrinking process is larger, which is easy to cause the problem of uneven stress in the hot shrinking process of the sleeve 2, affecting the hot shrinking effect. If both ends of the sleeve 2 are provided with open ends 21, the above-mentioned problem can be effectively improved, and the hot shrinking effect is improved. On the other hand, the sleeve 2 is provided with two open ends 21, which is also more convenient for the processing design of the sleeve 2, and saves the processing cost of the sleeve 2.

[0047] Figure 6 is a schematic view of a battery pack in the embodiment of the present application, and Figure 6 In some optional embodiments, the outer peripheral surface 12 includes a top wall 121 and a bottom wall 122, and the top wall 121 and the bottom wall 122 are oppositely arranged along the third direction Z; the battery pack further includes a control panel 4 arranged on one side of the battery pack 1 in the third direction Z; the control panel 4 is provided with a connecting line 41 for electrically connecting with an external power consumption device, and the fusion piece 3 is provided with a wire passing hole 32, and the connecting line 41 extends from the wire passing hole 32.

[0048] In the embodiment, the outer peripheral surface 12 of the battery pack 1 includes a top wall 121 and a bottom wall 122, and the top wall 121 and the bottom wall 122 are oppositely arranged along the third direction Z. After the battery pack 1 is placed in the battery pack box, the bottom wall 122 can be directly placed on the bottom plate of the battery pack box or on the protection plate at the bottom of the battery pack box. The control panel 4 is a control panel 4 of a battery management system (BMS), and the battery management system can intelligently manage and maintain each battery monomer 14, prevent overcharging and overdischarging of the battery monomer 14, prolong the service life of the battery monomer 14, and monitor the state of the battery monomer 14.

[0049] The control board 4 is arranged on one side of the battery pack 1 in the third direction Z, and can be fixed to the top of the battery pack 1 in the third direction Z by means of clamping, screw fasteners, assembly connection, etc. Figure 2 In the battery pack shown, the top wall 121 of the battery pack 1 is provided with a mounting groove, and the control board 4 can be embedded in the mounting groove and fixedly connected with the mounting groove. The mounting groove can limit the control board 4 to some extent, and improve the connection reliability of the control board 4 and the top wall 121. The control board 4 is provided with various integrated circuits, and connecting lines 41 for electrically connecting the integrated circuits with external electrical equipment. The fuse link 3 is provided with a wire hole 32, and the connecting lines 41 extend out of the wire hole 32 and are exposed outside the sleeve 2 (as shown in Figure 1 Generally, the number of connecting lines 41 is multiple, and the multiple connecting lines 41 can be bundled and constrained together by a cable tie, and then extend out of the wire hole 32. The size of the wire hole 32 is set according to the thickness of the connecting lines 41, and can ensure that the connecting lines 41 can smoothly pass through. The size of the wire hole 32 should not be too large, so as not to cause excessive shaking of the connecting lines 41 in the wire hole 32.

[0050] Figure 5 is an enlarged schematic view of the wire hole part of the fuse link, please refer to Figure 5 In some optional embodiments, the wire hole 32 penetrates the outer edge of the fuse link 3, and the hole wall of the wire hole 32 is coated with adhesive. Specifically, the wire hole 32 is arranged at the edge position of the fuse link 3 close to the top wall 121 of the battery pack 1, so as to facilitate the extension of the connecting lines 41 on the control board 4. Further, the wire hole 32 can also be arranged at the middle position of the edge part of the fuse link 3, and the specific position is set according to the position of the connecting lines 41 on the control board 4.

[0051] Since the part of the fuse link 3 provided with the wire hole 32 cannot be connected with the opening end 21 of the sleeve 2 by hot melting, the hole wall of the wire hole 32 is coated with adhesive in the embodiment, and the adhesive can fix the fuse link 3 and the opening end 21 of the sleeve 2, so as to improve the connection reliability of the fuse link 3 and the opening end 21 of the sleeve 2. In addition, the adhesive can also fix the connecting lines 41, so as to constrain and fix the connecting lines 41 in the wire hole 32, and improve the stability of the connecting lines 41.

[0052] Figure 7 is a partial enlarged schematic view of part A in Figure 6 , please refer to Figure 6 and Figure 7In some alternative embodiments, the battery pack 1 comprises a bracket 13 and a plurality of battery cells 14; the plurality of battery cells 14 are arranged in a stack in the bracket 13, and the bracket 13 is used to fix the plurality of battery cells 14; the bracket 13 has a cuboid structure, and the bracket 13 is provided with a reinforcing sheet 15 at a corner portion.

[0053] In the embodiment, the battery pack 1 comprises a bracket 13 and a plurality of battery cells 14; the plurality of battery cells 14 are arranged in a stack in the bracket 13 along a first direction X and a third direction Z; after the plurality of battery cells 14 are installed into the bracket 13, the plurality of battery cells 14 are fixed in the bracket 13 by gluing, so as to fix the battery cells 14 in the bracket 13. The bracket 13 can be a plastic bracket 13, which can realize insulation between the bracket 13 and the battery cells 14, avoid short circuit of the charging and discharging circuit of the battery cells 14, avoid excessive wear of the surface of the battery cells 14, play a certain protection role for the battery cells 14, reduce the total weight of the battery pack 1, and help the lightweight design of the battery pack.

[0054] The bracket 13 has a cuboid structure. When the battery pack falls, the force contact area is small, the impact force is large, the bracket 13 is easily damaged or broken, the battery cells 14 are damaged, cannot be normally used, and even a safety accident occurs. Based on this, the embodiment is provided with the reinforcing sheet 15 at the corner portion of the bracket 13. The reinforcing sheet 15 can be an aluminum sheet, a steel sheet or an alloy sheet, and has good strength and rigidity. As shown in Figure 6 The bracket 13 has eight corner portions, and each corner portion is provided with the reinforcing sheet 15 to realize comprehensive protection of the corner portion. When the battery pack falls, the reinforcing sheet 15 can realize force dispersion and buffering, absorb more stress impact, effectively improve the anti-collision performance of the bracket 13, improve the stability and safety of the battery pack when falling, protect the integrity of the bracket 13 and the battery cells 14 in the bracket 13, thereby improving the safety performance of the battery cells 14 in use. At the same time, the cost of the reinforcing sheet 15 is low, which also helps to control the preparation cost of the battery pack.

[0055] Please continue to refer to Figure 7 In some alternative embodiments, the reinforcing sheet 15 has an arc structure, the arc structure is curved towards the plurality of battery cells 14, and the arc structure is more helpful to realize force dispersion and buffering, thereby further improving the protection effect of the corner portion of the bracket 13. Alternatively, the reinforcing sheet 15 and the bracket 13 are an integral piece, the reinforcing sheet 15 is formed by stamping, can be embedded when the plastic bracket 13 is injection molded, and forms a structure that the plastic bracket 13 and the reinforcing sheet 15 are integrally formed, so as to further increase the reliability of the bracket 13 and improve the anti-collision performance of the bracket 13. Of course, the reinforcing sheet 15 can be provided as an arc structure, and can also be provided as an integral piece with the bracket 13, so as to further improve the anti-collision performance of the bracket 13.

[0056] Please continue to refer to Figure 6 In some alternative embodiments, the outer peripheral surface 12 further comprises two side walls 123, which are oppositely arranged along the second direction Y; the battery pack further comprises: a busbar 5 arranged on at least one side wall 123 and connected with the plurality of battery cells 14; and an insulation layer 6 connected to the two side walls 123, the insulation layer 6 being configured to achieve insulation between the two side walls 123 and the sleeve 2.

[0057] In the present embodiment, the outer peripheral surface 12 of the battery pack 1 further comprises two side walls 123, which are oppositely arranged along the second direction Y and located between the top wall 121 and the bottom wall 122, the two side walls 123 being the largest surfaces of the battery pack 1. Figure 6 In the battery pack shown in the above embodiment, the two side walls 123 are the end faces 11 of the cylindrical battery cells 14, and the busbar 5 is connected to one or both end faces 11 of the cylindrical battery cells 14 to achieve series or parallel connection of the plurality of battery cells 14. Since the end faces 11 of the battery cells 14 are exposed outside the bracket 13, the present embodiment is provided with the insulation layer 6, which is made of foam, asbestos, silica gel, rubber or other insulating materials, to achieve insulation between the two side walls 123 and the sleeve 2, i.e., insulation between the end faces 11 of the plurality of battery cells 14 and the sleeve 2, thereby avoiding electrical contact between the battery cells 14 and the busbar 5 and other components in the sleeve 2 to cause short circuit. In addition, the insulation layer 6 can also reduce the friction between the battery cells 14 and the busbar 5 and the sleeve 2, thereby protecting the battery cells 14 and the busbar 5 and helping to prolong the service life of the battery cells 14 and the busbar 5.

[0058] In some alternative embodiments, the welding sheet 3 and the sleeve 2 are made of the same material, i.e., thermoplastic material, to improve the effect of heat fusion connection between the welding sheet 3 and the sleeve 2 and improve the connection reliability. Alternatively, the welding sheet 3 and the sleeve 2 have the same thickness, so that the welding sheet 3 and the sleeve 2 can be fully connected, thereby avoiding material waste. Alternatively, the welding sheet 3 and the sleeve 2 are made of the same material and have the same thickness, so that the heat fusion connection between the sleeve 2 and the welding sheet 3 can be achieved by automatic operation, and the hollow area after heat fusion connection does not need to be handled by manual operation, thereby further improving the quality and preparation efficiency of the battery pack.

[0059] Finally, it needs to be explained that in this text, relational terms such as first and second and the like can only be used to distinguish one entity or action from another entity or action, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by an "comprising" statement serves as a means plus function alternative.

[0060] The above description is merely preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery pack, characterized by, The battery pack (1) has a first direction (X), and comprises end faces (11) oppositely arranged along the first direction (X), and an outer peripheral surface (12) arranged around the first direction (X); a sleeve (2) is heat-shrink wrapped on the outer peripheral surface (12), at least one end of the sleeve (2) along the first direction (X) is an open end (21), and the open end (21) is provided with an opening (22); a fusion sheet (3) is heat-fused with the open end (21) to seal the opening (22). The opening (22) is located in a central region of the open end (21), and the open end (21) is further provided with a flange (23) located on a circumferential side of the opening (22), and the flange (23) is heat-fused with the fusion sheet (3). An edge position of the fusion sheet (3) is provided with a fusion portion (31) heat-fused with the flange (23), and the fusion portion (31) is used for pre-positioning before heat fusion. Both ends of the sleeve (2) along the first direction (X) are open ends (21), and the number of the fusion sheets (3) is two, and the two fusion sheets (3) are heat-fused with the two open ends (21) one by one.

2. The battery pack of claim 1, wherein, The battery pack (1) further has a second direction (Y) and a third direction (Z), and the first direction (X), the second direction (Y) and the third direction (Z) intersect with each other; 3. The battery pack of claim 2, wherein, The outer peripheral surface (12) comprises a top wall (121) and a bottom wall (122), and the top wall (121) and the bottom wall (122) are oppositely arranged along the third direction (Z); 4. The battery pack of claim 1, wherein, The battery pack further comprises:

5. The battery pack of claim 1, wherein, A control panel (4) is arranged on one side of the battery pack (1) in the third direction (Z); A connecting line (41) for electrically connecting with an external power consumption device is arranged on the control panel (4), and a wire passing hole (32) is arranged on the fusion sheet (3), and the connecting line (41) extends from the wire passing hole (32). The wire passing hole (32) penetrates the outer edge of the fusion sheet (3), and the hole wall of the wire passing hole (32) is coated with adhesive. The battery pack (1) comprises a support (13) and a plurality of battery monomers (14); The plurality of battery monomers (14) are arranged in stacks in the support (13), and the support (13) is used for fixing the plurality of battery monomers (14); 6. The battery pack of claim 5, wherein, The support (13) has a square structure, and the support (13) is provided with a reinforcing sheet (15) at a corner position.

7. The battery pack of claim 5, wherein, The reinforcing sheet (15) has an arc structure, and the arc structure is curved towards the plurality of battery monomers (14); and / or, the reinforcing sheet (15) and the support (13) are an integral piece. The outer peripheral surface (12) further comprises two side walls (123), and the two side walls (123) are oppositely arranged along the second direction (Y); The battery pack further comprises:

8. The battery pack of claim 7, wherein, A bus bar (5) is arranged on at least one of the side walls (123) and connected with the plurality of battery monomers (14).

9. The battery pack of claim 7, wherein, ​ ​ ​ An insulating layer (6) is connected to the two side walls (123), and is used to realize insulation between the two side walls (123) and the sleeve (2).

10. The battery pack of claim 1, wherein, The welding piece (3) is made of the same material as the sleeve (2), and / or the welding piece (3) has the same thickness as the sleeve (2).

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