Battery pack sealing plate and manufacturing method therefor, tray, battery pack and electric device

Abstract

Disclosed is an electric device, comprising a battery pack, the battery pack comprising a battery pack sealing plate or a battery pack tray, which comprises the battery pack sealing plate. Further disclosed is a manufacturing method for the battery pack sealing plate. The battery pack sealing plate comprises: a first protective layer and a second protective layer, which are stacked on one another; and a first reinforcing layer and a second reinforcing layer, which are arranged between the first protective layer and the second protective layer, wherein the second reinforcing layer extends in the circumferential direction of the first reinforcing layer, and the strength of the first reinforcing layer is different from that of the second reinforcing layer.

Description

Battery pack sealing plate, manufacturing method thereof, tray, battery pack and electric device

[0001] Cross Reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202411051401.X, filed on August 1, 2024, and entitled "Battery pack sealing plate, manufacturing method thereof, tray, battery pack and electric device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of batteries, and in particular to a battery pack sealing plate, a manufacturing method thereof, a tray, a battery pack and an electric device. BACKGROUND

[0004] The battery pack sealing plate in the related art is usually arranged on the upper side or the lower side of the battery pack to cover the upper side or the lower side of the battery pack, that is, the battery pack sealing plate can be the upper cover plate of the battery pack or the bottom plate of the tray. Moreover, the battery pack sealing plate in the related art usually adds a reinforcing layer, such as a steel plate layer, between two substrates to improve the structural strength of the battery pack sealing plate, so that the sealing plate has a better protection effect on the battery pack.

[0005] However, the strength performance of the battery pack sealing plate in the related art is consistent at multiple positions, which cannot adapt to different strength requirements of different positions. For example, if the local structural strength of the battery pack sealing plate is too low, the structural strength of the position with a higher strength requirement may be insufficient, and if the local structural strength of the battery pack sealing plate is too high, the structural strength of the position with a lower structural strength requirement may be too high, which is not convenient for processing and manufacturing.

[0006] DISCLOSURE

[0007] The present disclosure aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present disclosure is to provide a battery pack sealing plate, the structural strength of which is different at different positions, which can better protect the battery pack and is convenient for processing and manufacturing.

[0008] The present disclosure also provides a manufacturing method of the battery pack sealing plate.

[0009] The present disclosure also provides a battery pack tray having the battery pack sealing plate.

[0010] The present disclosure also provides a battery pack having the battery pack tray.

[0011] The present disclosure also provides an electric device having the battery pack.

[0012] In order to achieve the above object, the battery pack sealing plate according to the first aspect of the present disclosure comprises a first protective layer; a second protective layer, which is stacked with the first protective layer; a first reinforcing layer; and a second reinforcing layer, which is arranged between the first protective layer and the second protective layer; wherein the second reinforcing layer extends along the circumference of the first reinforcing layer, and the strength of the first reinforcing layer is different from that of the second reinforcing layer.

[0013] The battery pack sealing plate according to the present disclosure has different structural strengths at different positions, which can better protect the battery pack and facilitate processing and manufacturing.

[0014] According to some embodiments of the present disclosure, one of the first reinforcing layer and the second reinforcing layer is a first material, and the other of the first reinforcing layer and the second reinforcing layer is a second material, and the strength of the first material is different from that of the second material.

[0015] According to some embodiments of the present disclosure, the first material is a metal material, and the second material is a glass fiber cloth.

[0016] According to some embodiments of the present disclosure, the thickness of the first reinforcing layer is different from that of the second reinforcing layer.

[0017] According to some embodiments of the present disclosure, the battery pack sealing plate further comprises a connecting layer, the first reinforcing layer is provided with a through hole, the connecting layer fills the through hole and is connected with the first protective layer and the second protective layer respectively, and the strength of the connecting layer is different from that of the first reinforcing layer.

[0018] According to some embodiments of the present disclosure, the first reinforcing layer is a first material, and the connecting layer, the first protective layer and the second protective layer are all a third material, and the strength of the first material is different from that of the third material.

[0019] According to some embodiments of the present disclosure, the first material is a metal material, and the third material is a thermoplastic material.

[0020] According to some embodiments of the present disclosure, the through hole is a plurality of through holes, and the plurality of through holes are arranged at intervals along the length direction of the first reinforcing layer; and / or, the plurality of through holes are arranged at intervals along the width direction of the first reinforcing layer.

[0021] According to some embodiments of the present disclosure, the battery pack sealing plate comprises: a protection portion located in the middle of the battery pack sealing plate; a transition portion extending along the circumference of the protection portion and connected with the protection portion; and an edge portion extending along the circumference of the protection portion and connected with the transition portion, the edge portion and the protection portion being staggered in the thickness direction of the battery pack sealing plate; wherein the first reinforcing layer is arranged at least on the protection portion, and the second reinforcing layer is arranged at least on the edge portion.

[0022] According to some embodiments of the present disclosure, the battery pack sealing plate is used to cover the lower side of the battery assembly, and the strength of the first reinforcing layer is greater than that of the second reinforcing layer.

[0023] According to some embodiments of the present disclosure, the first reinforcing layer is arranged on the protection portion; and / or, a part of the second reinforcing layer is arranged on the transition portion and the edge portion, and another part of the second reinforcing layer is arranged on the protection portion.

[0024] According to some embodiments of the present disclosure, the battery pack sealing plate is used to cover the upper side of the battery assembly, and the strength of the second reinforcing layer is greater than that of the first reinforcing layer.

[0025] According to some embodiments of the present disclosure, a part of the first reinforcing layer is arranged on the protection portion and the transition portion, and another part of the first reinforcing layer is arranged on the edge portion; and / or, the second reinforcing layer is arranged on the edge portion.

[0026] According to the second aspect of the present disclosure, a manufacturing method of a battery pack sealing plate is provided, comprising: arranging a first reinforcing layer and a second reinforcing layer with different strengths between a first protection layer and a second protection layer, the second reinforcing layer being arranged on the circumferential side of the first reinforcing layer to obtain a sealing plate pre-processing piece; and processing the sealing plate pre-processing piece to obtain the battery pack sealing plate.

[0027] According to the manufacturing method of the battery pack sealing plate of the second aspect of the present disclosure, the structural strength of the battery pack sealing plate at different positions is different, which can better protect the battery pack.

[0028] According to some embodiments of the present disclosure, the step of processing the sealing plate pre-processing piece to obtain the battery pack sealing plate comprises: preheating the plastic absorption to obtain a sealing plate pre-forming piece; hot-pressing the sealing plate pre-forming piece to obtain a sealing plate blank; and cooling the sealing plate blank and trimming the sealing plate blank to obtain the battery pack sealing plate.

[0029] According to some embodiments of the present disclosure, before the step of laying the first reinforcing layer and the second reinforcing layer with different strengths between the first protective layer and the second protective layer, the step of laying the first reinforcing layer and the second reinforcing layer with different strengths between the first protective layer and the second protective layer further comprises: stamping the first reinforcing layer to form a plurality of through holes; die cutting the first protective layer and the second protective layer; and die cutting the second reinforcing layer.

[0030] According to some embodiments of the present disclosure, the step of preheating the sealing plate pre-processed piece to obtain a sealing plate pre-forming piece comprises: preheating the sealing plate pre-processed piece at a first preset temperature for a first preset time, and then placing the sealing plate pre-processed piece into a blister mold to obtain a sealing plate pre-forming piece.

[0031] According to some embodiments of the present disclosure, the step of hot pressing the sealing plate pre-forming piece to obtain a sealing plate blank comprises: placing the sealing plate pre-forming piece into a hot pressing mold and heating at a second preset temperature for a second preset time, and then pressing the sealing plate pre-forming piece at a preset holding pressure for a third preset time.

[0032] According to a third aspect of the present disclosure, a battery pack tray is provided, comprising: a battery pack sealing plate according to the first aspect of the present disclosure, or a battery pack sealing plate manufactured by the manufacturing method of the battery pack sealing plate according to the second aspect of the present disclosure; and a support frame connected and supported below the battery pack sealing plate.

[0033] According to the battery pack tray of the third aspect of the present disclosure, the battery pack sealing plate is manufactured by the battery pack sealing plate according to the first aspect of the present disclosure or the manufacturing method of the battery pack sealing plate according to the second aspect of the present disclosure, and the structural strength of different positions of the battery pack sealing plate is different, which can better protect the battery pack and is convenient for processing and manufacturing.

[0034] According to a fourth aspect of the present disclosure, a battery pack is provided, comprising: a battery pack sealing plate according to the first aspect of the present disclosure; or a battery pack sealing plate manufactured by the manufacturing method of the battery pack sealing plate according to the second aspect of the present disclosure; or a battery pack tray according to the third aspect of the present disclosure.

[0035] According to the battery pack of the fourth aspect of the present disclosure, the structural strength of different positions of the battery pack sealing plate is different, which can better protect the battery pack and is convenient for processing and manufacturing.

[0036] According to a fifth aspect of the present disclosure, an electrical device is provided, which comprises the battery pack according to the fourth aspect of the present disclosure.

[0037] According to the fifth aspect of the present disclosure, the electrical device has better protection performance and is more convenient to process by using the battery pack according to the fourth aspect of the present disclosure.

[0038] Additional aspects and advantages of the present disclosure will be made apparent from the following description, which is given by way of example only, with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0039] The above and / or additional aspects and advantages of the present disclosure will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0040] FIG. 1 is a structural schematic diagram of a battery pack tray according to an embodiment of the present disclosure;

[0041] FIG. 2 is an exploded view of the battery pack tray according to an embodiment of the present disclosure;

[0042] FIG. 3 is a structural schematic diagram of a battery pack sealing plate according to an embodiment of the present disclosure;

[0043] FIG. 4 is an exploded view of the battery pack sealing plate according to an embodiment of the present disclosure;

[0044] FIG. 5 is a structural schematic diagram of a first reinforcing plate of the battery pack sealing plate according to an embodiment of the present disclosure;

[0045] FIG. 6 is a structural schematic diagram of a first reinforcing plate of the battery pack sealing plate according to another embodiment of the present disclosure;

[0046] FIG. 7 is a partial structural schematic diagram of the battery pack sealing plate according to an embodiment of the present disclosure;

[0047] FIG. 8 is a detailed view of A in FIG. 7;

[0048] FIG. 9 is a detailed view of B in FIG. 7;

[0049] FIG. 10 is an exploded view of a sealing cover, a tray and a battery assembly according to an embodiment of the present disclosure;

[0050] FIG. 11 is a flowchart of a manufacturing method of the battery pack sealing plate according to an embodiment of the present disclosure;

[0051] FIG. 12 is a schematic block diagram of a battery pack according to an embodiment of the present disclosure;

[0052] FIG. 13 is another schematic block diagram of a battery pack according to an embodiment of the present disclosure;

[0053] FIG. 14 is a schematic block diagram of an electrical equipment according to an embodiment of the present disclosure.

[0054] Reference signs: 1, battery pack sealing plate; 2, battery pack tray; 3, battery assembly; 4, sealing cover; 10, battery pack; 20, electrical equipment; 100, first protective layer; 200, second protective layer; 300, first reinforcing layer; 310, through hole; 400, second reinforcing layer; 500, connecting layer; 600, protective part; 610, transition part; 620, edge part; 621, first mounting hole; 622, second mounting hole; 700, support frame; 800, expansion beam. DETAILED DESCRIPTION

[0055] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. Examples of the embodiments are shown in the drawings, in which the same or similar components have the same or similar reference numerals throughout. The embodiments described below by reference to the drawings are exemplary only, and are for the purpose of explanation of the present disclosure, and are not to be understood as limiting the present disclosure.

[0056] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial" and "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present disclosure.

[0057] In the description of the present disclosure, "first feature" and "second feature" can include one or more of the features.

[0058] In the description of the present disclosure, the meaning of "a plurality of" is two or more, and the meaning of "several" is one or more.

[0059] A battery pack sealing plate 1 according to an embodiment of the present disclosure is described below with reference to the accompanying drawings.

[0060] As shown in FIGS. 1-9, the battery pack sealing plate 1 according to an embodiment of the present disclosure includes a first protective layer 100, a second protective layer 200, a first reinforcing layer 300, and a second reinforcing layer 400.

[0061] The first protective layer 100 and the second protective layer 200 are arranged in layers, the first reinforcing layer 300 and the second reinforcing layer 400 are arranged between the first protective layer 100 and the second protective layer 200, the second reinforcing layer 400 extends along the circumference of the first reinforcing layer 300, and the strength of the first reinforcing layer 300 and the strength of the second reinforcing layer 400 are different.

[0062] The first protective layer 100 and the second protective layer 200 can be insulating protective layers, which can avoid the problem of high-voltage arc fire after liquid leakage of the battery pack during a collision.

[0063] The strength of the first reinforcing layer 300 and the strength of the second reinforcing layer 400 are different, which means that the strength limit of the first reinforcing layer 300 and the strength limit of the second reinforcing layer 400 are different, so that the maximum force that the first reinforcing layer 300 and the second reinforcing layer 400 can withstand can be different, and then the strength of the first reinforcing layer 300 and the second reinforcing layer 400 can be set according to the strength requirement of different positions of the battery pack sealing plate 1, so that the battery pack sealing plate 1 can be used to protect different parts of the battery pack 10, which is beneficial to improve the protection effect of the battery pack sealing plate 1 on the battery pack 10.

[0064] The battery pack sealing plate 1 in the embodiment of the present disclosure can be an upper cover plate of the battery pack or a bottom plate of the battery pack tray 2.

[0065] According to the battery pack sealing plate 1 of the embodiment of the present disclosure, the first protective layer 100 and the second protective layer 200 are arranged in layers, the first reinforcing layer 300 and the second reinforcing layer 400 are arranged between the first protective layer 100 and the second protective layer 200, and the second reinforcing layer 400 extends along the circumference of the first reinforcing layer 300. That is, the first reinforcing layer 300 and the second reinforcing layer 400 are located in the same plane, and the first protective layer 100 and the second protective layer 200 are arranged in layers on opposite sides of the first reinforcing layer 300 and the second reinforcing layer 400, that is, the first reinforcing layer 300 and the second reinforcing layer 400 are arranged between the first protective layer 100 and the second protective layer 200, and the first reinforcing layer 300 can correspond to the middle part of the battery pack sealing plate 1, and the second reinforcing layer 400 corresponds to the part adjacent to the edge of the battery pack sealing plate 1, and then the first reinforcing layer 300 and the second reinforcing layer 400 can be used to strengthen different parts of the battery pack sealing plate 1, to improve the structural strength of the battery pack sealing plate 1, so that the battery pack sealing plate 1 has better protection effect on the battery pack.

[0066] And, the strength of the first reinforcing layer 300 and the strength of the second reinforcing layer 400 are different, so that the structural strength of the middle part of the battery pack sealing plate 1 and the position adjacent to the edge of the battery pack sealing plate 1 can be different, and then the structure of the first reinforcing layer 300 and the second reinforcing layer 400 can be set according to the strength requirement of different positions of the battery pack sealing plate 1, so as to improve the protection effect of the battery pack sealing plate 1 on the battery pack.

[0067] For example, when the battery pack sealing plate 1 is used to cover the lower side of the battery pack, the strength of the first reinforcing layer 300 can be higher than the strength of the second reinforcing layer 400, so that the structural strength of the middle part of the battery pack sealing plate 1 can be greater, and the lower side of the battery pack can be effectively protected. When the battery pack sealing plate 1 is used to cover the upper side of the battery pack, the strength of the second reinforcing layer 400 can be higher than the strength of the first reinforcing layer 300, so that the structural strength of the edge of the battery pack sealing plate 1 can be greater, which is beneficial to improve the connection stability of the battery pack sealing plate 1.

[0068] Moreover, it can be understood that the battery pack sealing plate 1 is usually provided with a groove to accommodate and fix the battery pack in the groove, that is, the battery pack sealing plate 1 needs to be bent to form the groove. By distinguishing the first reinforcing layer 300 and the second reinforcing layer 400, the reinforcing layer with weaker strength can be used to cover the position of the battery pack sealing plate 1 which needs to be bent, so as to facilitate the bending processing of the battery pack sealing plate 1, thereby the processing is more simple and labor-saving.

[0069] The structural strength of different positions of the battery pack sealing plate 1 according to the embodiments of the present disclosure is different, which can better protect the battery pack and facilitate the processing and manufacturing.

[0070] In some specific embodiments of the present disclosure, one of the first reinforcing layer 300 and the second reinforcing layer 400 is a first material, and the other of the first reinforcing layer 300 and the second reinforcing layer 400 is a second material, and the strength of the first material and the strength of the second material are different.

[0071] For example, the strength of the first material can be higher than the strength of the second material.

[0072] In this way, if the strength of the first reinforcing layer 300 needs to be higher than the strength of the second reinforcing layer 400, the first reinforcing layer 300 can be the first material and the second reinforcing layer 400 can be the second material; if the strength of the second reinforcing layer 400 needs to be higher than the strength of the first reinforcing layer 300, the first reinforcing layer 300 can be the second material and the second reinforcing layer 400 can be the first material.

[0073] In other specific embodiments of the present disclosure, the thickness of the first reinforcing layer 300 and the thickness of the second reinforcing layer 400 are different.

[0074] It can be understood that when the materials of the first reinforcing layer 300 and the second reinforcing layer 400 are the same, the structural strength of the reinforcing layer with a greater thickness is higher. That is, if the strength of the first reinforcing layer 300 needs to be higher than that of the second reinforcing layer 400, the thickness of the first reinforcing layer 300 can be greater than that of the second reinforcing layer 400; if the strength of the second reinforcing layer 400 needs to be higher than that of the first reinforcing layer 300, the thickness of the first reinforcing layer 300 can be less than that of the second reinforcing layer 400.

[0075] Specifically, if the strength of the first reinforcing layer 300 needs to be higher than that of the second reinforcing layer 400, the first reinforcing layer 300 can be of a first material and the second reinforcing layer 400 can be of a second material, and the thickness of the first reinforcing layer 300 can be equal to that of the second reinforcing layer 400; or the first reinforcing layer 300 can be of the first material and the second reinforcing layer 400 can be of the second material, and the thickness of the first reinforcing layer 300 can be greater than that of the second reinforcing layer 400; or the first reinforcing layer 300 and the second reinforcing layer 400 can both be of the first material, and the thickness of the first reinforcing layer 300 can be greater than that of the second reinforcing layer 400; or the first reinforcing layer 300 and the second reinforcing layer 400 can both be of the second material, and the thickness of the first reinforcing layer 300 can be greater than that of the second reinforcing layer 400.

[0076] If the strength of the second reinforcing layer 400 needs to be higher than that of the first reinforcing layer 300, the second reinforcing layer 400 can be of the first material and the first reinforcing layer 300 can be of the second material, and the thickness of the second reinforcing layer 400 can be equal to that of the first reinforcing layer 300; or the second reinforcing layer 400 can be of the first material and the first reinforcing layer 300 can be of the second material, and the thickness of the second reinforcing layer 400 can be greater than that of the first reinforcing layer 300; or the first reinforcing layer 300 and the second reinforcing layer 400 can both be of the first material, and the thickness of the second reinforcing layer 400 can be greater than that of the first reinforcing layer 300; or the first reinforcing layer 300 and the second reinforcing layer 400 can both be of the second material, and the thickness of the second reinforcing layer 400 can be greater than that of the first reinforcing layer 300.

[0077] In some specific embodiments of the present disclosure, the first material is a metal material, and the second material is a glass fiber cloth. For example, the first material can be a steel material or an aluminum alloy material, so that both the first material and the second material can strengthen the structural strength of the battery pack sealing plate 1, and the structural strength of the first material can be greater, which can effectively utilize the first material to improve the structural strength of the battery pack sealing plate 1, and further improve the protection effect of the battery pack sealing plate 1 on the battery pack.

[0078] In some embodiments of the present disclosure, as shown in FIGS. 4-6 and 9, the battery pack sealing plate 1 further comprises a connecting layer 500, the first reinforcing layer 300 is provided with a through hole 310, and the connecting layer 500 fills the through hole 310 and is connected with the first protective layer 100 and the second protective layer 200 respectively, and the strength of the connecting layer 500 is different from the strength of the first reinforcing layer 300.

[0079] The cross-sectional shape of the through hole 310 can be circular, oval, rectangular, polygonal, or strip-shaped, but is not limited thereto.

[0080] In this way, the first protective layer 100 and the second protective layer 200 can be connected with the first reinforcing layer 300 respectively, and the first protective layer 100 and the second protective layer 200 can be directly connected together through the connecting layer 500, wherein the connecting layer 500, the first protective layer 100, and the second protective layer 200 can all be thermoplastic materials, and after thermoplastic processing, the connecting layer 500, the first protective layer 100, and the second protective layer 200 can be hot-melted together, the connecting strength is higher, and thus the connecting strength between the first protective layer 100 and the second protective layer 200 can be improved, so that the structural strength of the battery pack sealing plate 1 is higher.

[0081] Further, through the cooperation of the connecting layer 500 and the side wall of the through hole 310, the first reinforcing layer 300 can be limited in the radial direction of the through hole 310, so that the first reinforcing layer 300, the first protective layer 100, and the second protective layer 200 are prevented from relatively shaking.

[0082] In addition, by providing the through hole 310 and filling the connecting layer 500 in the through hole 310, the connecting layer 500 in the through hole 310 can melt when the battery pack is in thermal runaway, at which time the through hole 310 can form an exhaust passage of the battery pack, so that the heat in the battery pack can be quickly discharged to the outside of the battery pack through the through hole 310 and the explosion-proof valve of the battery pack, and the explosion of the battery pack can be more effectively prevented.

[0083] Further, the first reinforcing layer 300 is made of a first material, and the connecting layer 500, the first protective layer 100, and the second protective layer 200 are all made of a third material, and the strength of the first material is different from the strength of the third material.

[0084] For example, the first material is a metal material, and the third material is a thermoplastic material, that is, the first reinforcing layer 300 is made of a metal material, for example, the first reinforcing layer 300 can be made of steel or aluminum alloy, and the connecting layer 500, the first protective layer 100, and the second protective layer 200 are all made of a thermoplastic material, for example, polyethylene, polypropylene, polystyrene, polyvinyl chloride, and nylon.

[0085] In this way, the structural strength of the first reinforcing layer 300 can be higher, so as to improve the structural strength of the battery pack sealing plate 1 by using the first reinforcing layer 300, so as to improve the protection effect of the battery pack sealing plate 1. Meanwhile, the connecting layer 500, the first protection layer 100 and the second protection layer 200 can be fused into an integrated structure after being subjected to hot pressing, and the connecting strength between the connecting layer 500, the first protection layer 100 and the second protection layer 200 can be higher, further improving the overall connecting strength of the battery pack sealing plate 1.

[0086] In some embodiments of the present disclosure, as shown in FIGS. 4-6, the through hole 310 is a plurality of through holes 310, and the plurality of through holes 310 are arranged at intervals along the length direction of the first reinforcing layer 300; and / or, the plurality of through holes 310 are arranged at intervals along the width direction of the first reinforcing layer 300.

[0087] For example, the cross section of the through hole 310 can be circular, elliptical, rectangular or polygonal, and the plurality of through holes 310 are arranged at intervals along the length direction and the width direction of the first reinforcing layer 300.

[0088] Alternatively, in some embodiments, the through hole 310 can be a long strip-shaped hole, and the plurality of through holes 310 can be arranged at intervals along the length direction or the width direction of the first reinforcing layer 300.

[0089] In this way, the plurality of through holes 310 can be uniformly distributed at a plurality of positions of the first reinforcing layer 300, so that the connecting layer 500 can be distributed at a plurality of positions of the first reinforcing layer 300, so that a plurality of positions of the first protection layer 100 and the second protection layer 200 can be connected by the connecting layer 500, further improving the connecting strength of the first protection layer 100 and the second protection layer 200, and the overall connecting strength of the battery pack sealing plate 1 is higher.

[0090] In some embodiments of the present disclosure, as shown in FIG. 8, the battery pack sealing plate 1 comprises a protection part 600, a transition part 610 and an edge part 620.

[0091] The protection part 600 is located at the middle part of the battery pack sealing plate 1, the transition part 610 extends along the circumference of the protection part 600 and is connected with the protection part 600, the edge part 620 extends along the circumference of the protection part 600 and is connected with the transition part 610, and the edge part 620 and the protection part 600 are staggered in the thickness direction of the battery pack sealing plate 1; wherein the first reinforcing layer 300 is arranged at least in the protection part 600, and the second reinforcing layer 400 is arranged at least in the edge part 620.

[0092] The edge portion 620 and the protection portion 600 are staggered in the thickness direction of the battery pack sealing plate 1, that is, the edge portion 620 and the protection portion 600 are not in the same plane along the thickness direction of the battery pack sealing plate 1, for example, the edge portion 620 can protrude upward from the protection portion 600, or the protection portion 600 can protrude upward from the edge portion 620.

[0093] In this way, the edge portion 620 can extend along the circumference of the battery pack sealing plate 1, and the battery pack sealing plate 1 can be configured to have a groove for fixing the battery module, that is, the protection portion 600 can form the bottom wall of the groove, and the transition portion 610 can form the side wall of the groove.

[0094] As shown in FIGS. 1-3, the edge portion 620 can be provided with a plurality of first mounting holes 621 and a plurality of second mounting holes 622, the first mounting holes 621 are used to achieve the connection and fixation of the battery pack upper cover and the battery pack lower cover, and the second mounting holes 622 can be used to connect and fix the expansion beam 800.

[0095] Therefore, the first reinforcing layer 300 can at least be used to improve the structural strength of the protection portion 600, and the second reinforcing layer 400 can at least be used to improve the structural strength of the edge portion 620, and the structural strength of the protection portion 600 and the structural strength of the edge portion 620 can be high, so that the protection portion 600 can better protect the battery pack, and the connection of the battery pack upper cover and the battery pack lower cover can be more stable and reliable.

[0096] In some embodiments of the present disclosure, as shown in FIG. 1, the battery pack sealing plate 1 is used to cover the lower side of the battery assembly 3, and the strength of the first reinforcing layer 300 is greater than the strength of the second reinforcing layer 400.

[0097] That is, when the battery pack sealing plate 1 is the battery pack lower cover, at this time the battery pack sealing plate 1 can be configured as part of the battery pack tray 2, and the battery pack sealing plate 1 is used to protect the lower side of the battery assembly 3, and by setting the strength of the first reinforcing layer 300 to be greater than the strength of the second reinforcing layer 400, the structural strength of the position of the middle portion of the battery pack sealing plate 1 can be high, so that the protection strength of the middle portion of the lower side of the battery pack can be high, and the protection effect of the battery assembly 3 is better.

[0098] Further, as shown in FIGS. 4 and 8, the first reinforcing layer 300 is arranged on the protection portion 600; and / or, a part of the second reinforcing layer 400 is arranged on the transition portion 610 and the edge portion 620, and another part of the second reinforcing layer 400 is arranged on the protection portion 600.

[0099] That is, the second reinforcing layer 400 can cover the edge portion 620 and the transition portion 610 and extend to the protection portion 600, and the connection between the first reinforcing layer 300 and the second reinforcing layer 400 is on the protection portion 600, so that when the battery pack sealing plate 1 is hot-pressed and formed, the bending portion can be completely formed on the second reinforcing layer 400, the strength of the second reinforcing layer 400 is smaller, and the bending forming is easy to process, which is convenient for processing and manufacturing.

[0100] In some embodiments of the present disclosure, the battery pack sealing plate 1 is used to cover the upper side of the battery assembly 3, and the strength of the second reinforcing layer 400 is greater than that of the first reinforcing layer 300.

[0101] That is, when the battery pack sealing plate 1 is used as the upper cover of the battery pack, the battery pack sealing plate 1 is used to protect the upper side of the battery assembly 3, and by setting the strength of the second reinforcing layer 400 to be greater than that of the first reinforcing layer 300, the structural strength of the edge portion of the battery pack sealing plate 1 can be higher, and the structural strength of the edge portion 620 is higher. After the mounting hole is arranged on the edge portion 620, the connection strength between the battery pack sealing plate 1 and the expansion beam 800, and the connection strength between the upper cover of the battery pack and the lower cover of the battery pack can be higher, and the connection is more stable and reliable.

[0102] Further, a part of the first reinforcing layer 300 is arranged on the protection portion 600 and the transition portion 610, and another part of the first reinforcing layer 300 is arranged on the edge portion 620; and / or, the second reinforcing layer 400 is arranged on the edge portion 620.

[0103] That is, the first reinforcing layer 300 can cover the protection portion 600 and the transition portion 610 and extend to the edge portion 620, and the connection between the first reinforcing layer 300 and the second reinforcing layer 400 is on the edge portion 620, so that when the battery pack sealing plate 1 is hot-pressed and formed, the bending portion can be completely formed on the first reinforcing layer 300, the strength of the first reinforcing layer 300 is smaller, and the bending forming is easy to process, which is convenient for processing and manufacturing.

[0104] The manufacturing method of the battery pack sealing plate 1 according to the embodiments of the present disclosure will be described below with reference to the accompanying drawings. As shown in FIG. 11, the manufacturing method comprises the following steps:

[0105] The first reinforcing layer 300 and the second reinforcing layer 400 with different strengths are arranged between the first protection layer 100 and the second protection layer 200, and the second reinforcing layer 400 is arranged on the peripheral side of the first reinforcing layer 300, to obtain a sealing plate pre-processing piece;

[0106] The sealing plate pre-processing piece is processed to obtain the battery pack sealing plate 1.

[0107] Specifically, the first reinforcing layer 300 and the second reinforcing layer 400 can be laid on the first protective layer 100 first, and the second reinforcing layer 400 can be arranged around the first reinforcing layer 300 in the circumferential direction of the first reinforcing layer 300, and then the second protective layer 200 can be laid on the first reinforcing layer 300 and the second reinforcing layer 400 to obtain the sealing plate pre-processed piece.

[0108] In this way, the first reinforcing layer 300 and the second reinforcing layer 400 can be located in the same plane, and the first protective layer 100 and the second protective layer 200 can be respectively arranged on opposite sides of the first reinforcing layer 300 and the second reinforcing layer 400, that is, the first reinforcing layer 300 and the second reinforcing layer 400 can be laid between the first protective layer 100 and the second protective layer 200, and the first reinforcing layer 300 can correspond to the middle part of the battery pack sealing plate 1, and the second reinforcing layer 400 can correspond to the part adjacent to the edge of the battery pack sealing plate 1. In this way, the first reinforcing layer 300 and the second reinforcing layer 400 can be used to reinforce different parts of the battery pack sealing plate 1, so as to improve the structural strength of the battery pack sealing plate 1, and the battery pack sealing plate 1 can better protect the battery pack.

[0109] As shown in FIG. 10, which is an exploded view of the sealing cover 4, the battery pack tray 2, and the battery assembly 3, the battery pack sealing plate 1 can be a part (the middle plate part) of the sealing cover 4 or a part (the middle plate part) of the battery pack tray 2.

[0110] According to the manufacturing method of the battery pack sealing plate 1 of the embodiments of the present disclosure, the structural strength of different positions of the processed battery pack sealing plate 1 is different, which can better protect the battery pack.

[0111] In some embodiments of the present disclosure, as shown in FIG. 11, the step of processing the sealing plate pre-processed piece to obtain the battery pack sealing plate 1 can include:

[0112] Preheating the sealing plate pre-processed piece to obtain a sealing plate pre-formed piece;

[0113] Hot-pressing the sealing plate pre-formed piece to obtain a sealing plate blank;

[0114] Cooling the sealing plate blank and trimming the sealing plate blank to obtain the battery pack sealing plate 1. For example, the battery pack sealing plate 1 can be obtained by trimming the edges of the sealing plate blank and processing mounting holes and other hole positions. It can be understood that trimming the sealing plate blank after cooling can make the hole size and the contour size more accurate.

[0115] As shown in FIG. 11, the step of preheating the sealing plate pre-processed piece to obtain a sealing plate pre-formed piece can include: preheating the sealing plate pre-processed piece at a first preset temperature for a first preset time, and then placing the sealing plate pre-processed piece in a vacuum forming mold for vacuum forming preforming to obtain the sealing plate pre-formed piece.

[0116] For example, the first preset temperature can be 180-210℃, and the first preset time can be 5-30min.

[0117] For example, the first preset temperature can be 180-210℃, and the first preset time can be 5-30min.

[0118] Thus, by preheating the sealing plate pre-processing piece, the sealing plate pre-processing piece can be initially softened, and then the sealing plate pre-processing piece can be initially plasticized by suction molding, so that the sealing plate pre-processing piece can form a sealing plate pre-forming piece, and after suction molding, the layers of the sealing plate pre-forming piece can be tightly fused together, and a groove structure can be formed, and the battery assembly 3 can be prevented from being in the groove structure.

[0119] Then, as shown in FIG. 11, the step of hot-pressing the sealing plate pre-forming piece to obtain the sealing plate blank can include: placing the sealing plate pre-forming piece in a hot-pressing mold, heating the sealing plate pre-forming piece at a second preset temperature for a second preset time, and then pressing the sealing plate pre-forming piece at a preset pressure for a third preset time.

[0120] For example, the second preset temperature can be 150-220℃, the second preset time can be 10-15min, the preset pressure can be 3000-10000KN, and the third preset time can be 10-45min.

[0121] For example, the second preset temperature can be 150-220℃, the second preset time can be 10-15min, the preset pressure can be 3000-10000KN, and the third preset time can be 10-45min.

[0122] For example, the second preset temperature can be 150-220℃, the second preset time can be 10-15min, the preset pressure can be 3000-10000KN, and the third preset time can be 10-45min.

[0123] Specifically, after preheating and vacuum forming the sealing plate preform, the sealing plate preform can be placed in a hot-pressing mold integrated with a heating device, and the sealing plate preform is heated by the heating device at a second preset temperature for a second preset time, so that the sealing plate preform is heated and softened in plastic, and then a preset holding pressure is applied to the sealing plate preform for a third preset time to fix the shape of the sealing plate blank, thereby obtaining the sealing plate blank.

[0124] In addition, the hot-pressing mold can be configured with a liquid cooling channel, and after obtaining the sealing plate blank, the sealing plate blank can be quickly cooled by the flow of cooling liquid in the liquid cooling channel, for example, the entire cooling process can be controlled within 5-30 minutes to achieve rapid cooling and shaping of the battery pack sealing plate 1.

[0125] Finally, the battery pack sealing plate 1 can be subjected to air tightness detection to ensure that the sealing property of the battery pack sealing plate 1 is high.

[0126] In some embodiments of the present disclosure, as shown in FIG. 11, before the step of laying the first reinforcing layer 300 and the second reinforcing layer 400 with different strengths between the first protective layer 100 and the second protective layer 200, and laying the second reinforcing layer 400 on the peripheral side of the first reinforcing layer 300 to obtain the sealing plate preform, the method further comprises:

[0127] punching the first reinforcing layer 300 to form a plurality of through holes 310;

[0128] die cutting the first protective layer 100 and the second protective layer 200; and

[0129] die cutting the second reinforcing layer 400.

[0130] That is, before laying the first reinforcing layer 300, the second reinforcing layer 400, the first protective layer 100, and the second protective layer 200, the first protective layer 100, the second protective layer 200, and the second reinforcing layer 400 need to be processed by die cutting, and a plurality of through holes 310 can be formed on the first reinforcing layer 300 by punching, so that the connecting layer 500 can be filled into the through holes 310 when the first reinforcing layer 300 is laid.

[0131] The battery pack tray 2 according to the embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0132] As shown in FIGS. 1 and 2, the battery pack tray 2 comprises a battery pack sealing plate 1 and a support frame 700, the battery pack sealing plate 1 is the battery pack sealing plate 1 according to the above-mentioned embodiments of the present disclosure, or the battery pack sealing plate 1 is made by using the manufacturing method of the battery pack sealing plate 1 according to the above-mentioned embodiments of the present disclosure, and the support frame 700 is connected and supported below the battery pack sealing plate 1.

[0133] The support frame 700 can be a metal frame. In this way, the battery pack sealing plate 1 can be supported by the metal frame, so that the structural strength of the battery pack tray 2 can be higher, and the plurality of battery assemblies 3 can be fixed by the battery pack tray 2.

[0134] The battery pack sealing plate 1 and the support frame 700 can be fixed by structural adhesive bonding.

[0135] In addition, the battery pack tray 2 can also be provided with a plurality of expansion beams 800. The expansion beams 800 can be connected to the top of the battery pack sealing plate 1 by bolts, and the expansion beams 800, the battery pack sealing plate 1 and the support frame 700 are fixed together. The plurality of expansion beams 800 are respectively arranged at both ends of the length direction of the battery pack tray 2, and the expansion beams 800 extend along the width direction of the battery pack tray 2. By the plurality of expansion beams 800, the battery assemblies 3 can be fixed and limited, so as to reduce the expansion deformation of the battery assemblies 3.

[0136] According to the battery pack tray 2 of the embodiment of the present disclosure, by using the battery pack sealing plate 1 according to the above-mentioned embodiments of the present disclosure or the battery pack sealing plate 1 manufactured by the manufacturing method of the battery pack sealing plate 1 according to the above-mentioned embodiments of the present disclosure, the structural strength of different positions of the battery pack sealing plate 1 is different, which can better protect the battery pack, and is convenient for processing and manufacturing.

[0137] The battery pack 10 according to the embodiment of the present disclosure is described below with reference to FIGS. 12 and 13. The battery pack 10 includes the battery pack sealing plate 1 according to any one of the above-mentioned embodiments of the present disclosure; or the battery pack sealing plate 1 manufactured by the manufacturing method of the battery pack sealing plate 1 according to any one of the above-mentioned embodiments of the present disclosure; or the battery pack tray 2 according to any one of the above-mentioned embodiments of the present disclosure.

[0138] According to the battery pack 10 of the embodiment of the present disclosure, by using the battery pack sealing plate 1 according to any one of the above-mentioned embodiments of the present disclosure, the structural strength of different positions of the battery pack sealing plate 1 is different, which can better protect the battery pack 10, and is convenient for processing and manufacturing.

[0139] The power consuming equipment 20 according to the embodiment of the present disclosure is described below with reference to FIG. 14. The power consuming equipment 20 includes the battery pack 10 according to any one of the above-mentioned embodiments of the present disclosure. The power consuming equipment 20 can be a vehicle, a ship and the like, but is not limited thereto.

[0140] According to the power consuming equipment 20 of the embodiment of the present disclosure, by using the battery pack 10 according to any one of the above-mentioned embodiments of the present disclosure, the protection performance of the battery pack 10 is better, and the processing is more convenient.

[0141] Other configurations and operations of the battery pack sealing plate 1 and manufacturing method, tray, battery pack 10, and vehicle according to the embodiments of the present disclosure are known to those skilled in the art, and thus will not be described in detail here.

[0142] In the description of the present specification, the description referring to the terms "specific embodiment", "specific example" and the like means that the specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In the present specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0143] Although the embodiments of the present disclosure have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present disclosure, and the scope of the present disclosure is defined by the claims and their equivalents.

Claims

1. A battery pack sealing plate (1), characterized in that, The battery pack sealing plate (1) comprises: a first protective layer (100); a second protective layer (200) arranged in a stack with the first protective layer (100); a first reinforcing layer (300); and a second reinforcing layer (400) arranged between the first protective layer (100) and the second protective layer (200) and the first reinforcing layer (300); wherein the second reinforcing layer (400) extends along the circumference of the first reinforcing layer (300), and the strength of the first reinforcing layer (300) and the strength of the second reinforcing layer (400) are different.

2. The battery pack sealing plate (1) according to claim 1, characterized in that, One of the first reinforcing layer (300) and the second reinforcing layer (400) is a first material, and the other of the first reinforcing layer (300) and the second reinforcing layer (400) is a second material, the strength of the first material and the strength of the second material are different.

3. The battery pack sealing plate (1) according to claim 2, characterized in that, The first material is a metal material, and the second material is a glass fiber cloth.

4. The battery pack sealing plate (1) according to any one of claims 1-3, characterized in that, The thickness of the first reinforcing layer (300) and the thickness of the second reinforcing layer (400) are different.

5. The battery pack sealing plate (1) according to any one of claims 1-4, characterized in that, Further comprising: a connecting layer (500), the first reinforcing layer (300) is provided with a through hole (310), the connecting layer (500) fills the through hole (310) and is connected with the first protective layer (100) and the second protective layer (200) respectively, and the strength of the connecting layer (500) is different from the strength of the first reinforcing layer (300).

6. The battery pack sealing plate (1) according to claim 5, characterized in that, The first reinforcing layer (300) is a first material, the connecting layer (500), the first protective layer (100) and the second protective layer (200) are all third materials, and the strength of the first material and the strength of the third material are different.

7. The battery pack sealing plate (1) according to claim 6, characterized in that, The first material is a metal material, and the third material is a thermoplastic material.

8. The battery pack sealing plate (1) according to any one of claims 5-7, characterized in that, The through hole (310) is a plurality of, and a plurality of through holes (310) are arranged in the length direction of the first reinforcing layer (300); and / or, a plurality of through holes (310) are arranged in the width direction of the first reinforcing layer (300).

9. The battery pack sealing plate (1) according to any one of claims 1-8, characterized in that, The battery pack sealing plate (1) comprises: a protective part (600) located in the middle of the battery pack sealing plate (1); a transition part (610) extending along the circumference of the protective part (600) and connected with the protective part (600); and an edge part (620) extending along the circumference of the protective part (600) and connected with the transition part (610), and the edge part (620) and the protective part (600) are arranged staggered in the thickness direction of the battery pack sealing plate (1); wherein the first reinforcing layer (300) is arranged at least in the protective part (600), and the second reinforcing layer (400) is arranged at least in the edge part (620).

10. The battery pack sealing plate (1) according to claim 9, characterized in that, The battery pack sealing plate (1) is used to cover the lower side of the battery assembly (3), and the strength of the first reinforcing layer (300) is greater than the strength of the second reinforcing layer (400).

11. The battery pack sealing plate (1) according to claim 10, characterized in that, The first reinforcing layer (300) is arranged on the protection part (600); and / or, Part of the second reinforcing layer (400) is arranged on the transition part (610) and the edge part (620), and another part of the second reinforcing layer (400) is arranged on the protection part (600).

12. The battery pack sealing plate (1) according to any one of claims 9-11, characterized in that, The battery pack sealing plate (1) is arranged on the upper side of the battery assembly (3), and the strength of the second reinforcing layer (400) is greater than that of the first reinforcing layer (300).

13. The battery pack sealing plate (1) according to claim 12, characterized in that, Part of the first reinforcing layer (300) is arranged on the protection part (600) and the transition part (610), and another part of the first reinforcing layer (300) is arranged on the edge part (620); and / or, The second reinforcing layer (400) is arranged on the edge part (620).

14. A method of manufacturing a battery pack sealing plate (1), characterized by, Comprising: Laying the first reinforcing layer (300) and the second reinforcing layer (400) with different strengths between the first protection layer (100) and the second protection layer (200), and the second reinforcing layer (400) is laid on the periphery of the first reinforcing layer (300), to obtain a sealing plate pre-processing piece; Processing the sealing plate pre-processing piece to obtain the battery pack sealing plate (1).

15. The method of manufacturing a battery pack sealing plate (1) according to claim 14, characterized in that, The step of processing the sealing plate pre-processing piece to obtain the battery pack sealing plate (1) comprises: Preheating the blister to obtain a sealing plate pre-forming piece; Hot pressing the sealing plate pre-forming piece to obtain a sealing plate blank; and Cooling the sealing plate blank, and trimming the sealing plate blank to obtain the battery pack sealing plate (1).

16. The method of manufacturing a battery pack sealing plate (1) according to claim 14 or 15, characterized in that, Before the step of laying the first reinforcing layer (300) and the second reinforcing layer (400) with different strengths between the first protection layer (100) and the second protection layer (200), and the second reinforcing layer (400) is laid on the periphery of the first reinforcing layer (300), to obtain a sealing plate pre-processing piece, further comprising: Punching the first reinforcing layer (300) to form a plurality of through holes (310); Die cutting the first protection layer (100) and the second protection layer (200); and Die cutting the second reinforcing layer (400).

17. The method of manufacturing a battery pack sealing plate (1) according to claim 15, wherein The step of preheating the sealing plate pre-processing piece to obtain a sealing plate pre-forming piece comprises: Preheating the sealing plate pre-processing piece at a first preset temperature for a first preset time, and then placing the sealing plate pre-processing piece in a blister mold for pre-forming by suction molding to obtain a sealing plate pre-forming piece.

18. The method of manufacturing a battery pack sealing plate (1) according to claim 15 or 17, characterized in that, The step of hot pressing the sealing plate pre-forming piece to obtain a sealing plate blank comprises: Placing the sealing plate pre-forming piece in a hot pressing mold and heating at a second preset temperature for a second preset time, and then pressing the sealing plate pre-forming piece at a preset holding pressure for a third preset time.

19. A battery pack tray (2) characterized by, Comprising: The battery pack sealing plate (1) is according to any one of claims 1-11, or the battery pack sealing plate (1) is made by the manufacturing method of the battery pack sealing plate (1) according to any one of claims 14-18; and a support frame (700) connected to support under the battery pack sealing plate (1).

20. A battery pack (10) characterized by, comprising: the battery pack sealing plate (1) according to any one of claims 1-13; or the battery pack sealing plate (1) made by the manufacturing method of the battery pack sealing plate (1) according to any one of claims 14-18; or the battery pack tray (2) according to claim 19.

21. An electrical device (20) characterized by: comprising the battery pack (10) according to claim 20.

Images