Battery, battery pack, and electric device

Abstract

Embodiments of the present disclosure relate to the technical field of batteries, and provide a battery, a battery pack, an electric device, and a battery module. The battery comprises a wrapping structure, a conductive terminal, and a battery cell. The wrapping structure defines an accommodating space, a pressure relief port communicated with the accommodating space is formed on one side of the wrapping structure, and the remaining part of the wrapping structure is of a sealing structure. The conductive terminal is connected to the wrapping structure, and the conductive terminal and the pressure relief port are located on different sides of the wrapping structure. The battery cell is located in the accommodating space, and tabs of the battery cell are electrically connected to the conductive terminal. The wrapping structure guides a thermal runaway gas in the accommodating space to eject out of the pressure relief port, thus achieving directional ejection of the thermal runaway gas in the accommodating space of the battery. The conductive terminal and the pressure relief port are located on different sides of the wrapping structure, so that the thermal runaway gas ejected out of the pressure relief port can be far away from the conductive terminal as much as possible.

Description

Battery, battery pack and power-consuming device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] The present disclosure is based on Chinese patent application numbered 202410254427.8, filed on March 6, 2024, and entitled “A battery, a battery pack, an electrical device, and a battery module,” and Chinese patent application numbered 202410254542.5, filed on March 6, 2024, and entitled “A battery pack, a battery module, a battery cell, and an electrical device,” and claims the priority of the above-mentioned Chinese patent applications. The entire contents of the above-mentioned Chinese patent applications are hereby incorporated into the present disclosure by reference. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular to a battery, a battery pack, and an electrical device. Background Art

[0004] Batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in energy storage fields.

[0005] In the related art, when a battery experiences thermal runaway, the gas of the battery due to the thermal runaway will be ejected in all directions, and the ejection direction of the gas of the battery due to the thermal runaway will be uncertain. Summary of the Invention

[0006] In view of this, the embodiments of the present disclosure are intended to provide a battery, a battery pack, and an electrical device, so that the gas ejected when the battery experiences thermal runaway is ejected along a preset direction.

[0007] To achieve the above objectives, the technical solution of the embodiment of the present disclosure is implemented as follows:

[0008] An embodiment of the present disclosure provides a battery, comprising:

[0009] A wrapping structure, forming a first accommodating space, wherein a pressure relief port communicating with the first accommodating space is formed on one side of the wrapping structure, and the rest of the wrapping structure is a sealing structure;

[0010] a conductive terminal connected to the package structure, wherein the conductive terminal and the pressure relief port are located on different sides of the package structure;

[0011] A battery cell is located in the first accommodation space, and a tab of the battery cell is electrically connected to the conductive terminal.

[0012] In the disclosed embodiment, if a battery cell within a battery packaging structure experiences thermal runaway, due to the pressure relief vent formed on one side of the packaging structure and connected to the first accommodation space, the generated thermal runaway gas faces significant resistance to escape from other portions of the packaging structure except the pressure relief vent. This makes it difficult for the thermal runaway gas to escape from the packaging structure beyond the pressure relief vent. The packaging structure guides the thermal runaway gas to eject from the packaging structure through the pressure relief vent, thereby relieving pressure in the first accommodation space within the packaging structure and achieving a directional eruption of the thermal runaway gas. Because the conductive terminal and the pressure relief vent are located on different sides of the packaging structure, the thermal runaway gas ejected from the pressure relief vent and any material carried by the thermal runaway gas can be kept as far away from the conductive terminal as possible.

[0013] In one embodiment, the battery further includes a pressure relief assembly connected to the wrapping structure, wherein the pressure relief assembly cover is provided on the pressure relief port to shield the pressure relief port, and the pressure relief assembly is used to open the pressure relief port under the action of the air pressure in the first accommodation space to relieve pressure in the first accommodation space.

[0014] In the embodiment of the present disclosure, when the battery is operating normally, since the pressure relief assembly cover is provided on the pressure relief port to block the pressure relief port, it can inhibit external debris from entering the first storage space and can also reduce, to a certain extent, the possibility of the structure in the first storage space escaping from the pressure relief port. In the event that a battery cell in the battery's packaging structure experiences thermal runaway, a large amount of thermal runaway ejecta accumulates in the first storage space, increasing the pressure in the first storage space. When the pressure relief assembly can no longer withstand the pressure in the first storage space, the thermal runaway ejecta in the first storage space breaks through the pressure relief assembly and is ejected from the pressure relief port, causing the first storage space to release pressure. The pressure relief assembly can not only effectively inhibit external debris from entering the first storage space and protect the structure in the first storage space, but also relieve pressure under the action of the air pressure in the first storage space.

[0015] In one embodiment, the pressure relief assembly includes a one-way pressure relief device, and the one-way pressure relief device cover is provided on the pressure relief port to cover the pressure relief port. The one-way pressure relief device is used to open the pressure relief port under the action of the air pressure in the first accommodating space to relieve pressure in the first accommodating space. The one-way pressure relief device is also used to press toward the pressure relief port under the action of the force on the side of the one-way pressure relief device away from the pressure relief port to keep the pressure relief port covered.

[0016] In the disclosed embodiment, when a battery cell in the battery where the one-way pressure relief device is located experiences thermal runaway, the thermal runaway ejecta accumulated in the first accommodation space generates a large air pressure that pushes open the one-way pressure relief device, causing the thermal runaway ejecta to release pressure from the pressure relief port. Other batteries in the battery pack experience thermal runaway, causing the thermal runaway ejecta to impact the battery cells that have not experienced thermal runaway from the side of the one-way pressure relief device facing away from the pressure relief port. Under the impact of the thermal runaway ejecta on the side facing away from the pressure relief port, the one-way pressure relief device corresponding to the battery cells that have not experienced thermal runaway is pressed toward the pressure relief port, allowing the one-way pressure relief device to maintain its shielding of the pressure relief port, thereby reducing the possibility that the thermal runaway ejecta on the side of the one-way pressure relief device facing away from the pressure relief port enters the first accommodation space, causing the battery cell to experience thermal runaway under the influence of the thermal runaway ejecta, thereby effectively suppressing the spread of thermal runaway.

[0017] In one embodiment, the one-way pressure reliever is connected to the wrapping structure on one side along the target direction, and the one-way pressure reliever is used to deform under the action of external force to move closer to or away from the pressure relief port on the other side along the target direction, and the target direction is arranged crosswise with the opening direction of the pressure relief port.

[0018] In the disclosed embodiment, if a battery cell within the battery packaging structure experiences thermal runaway, the one-way pressure relief device deforms outwardly away from the pressure relief port on the other side of the target direction under the pressure of the thermal runaway ejecta accumulated within the first accommodation space, thereby opening the pressure relief port and releasing pressure within the first accommodation space. If a battery cell within the packaging structure of another battery cell within the battery pack experiences thermal runaway, the one-way pressure relief device corresponding to the battery cell not experiencing thermal runaway within the battery pack deforms inward toward the pressure relief port on the other side of the target direction under the impact of the thermal runaway ejecta on the side facing away from the pressure relief port, causing the one-way pressure relief device to press against the pressure relief port along the other side of the target direction, thereby maintaining the one-way pressure relief device covering the pressure relief port.

[0019] In one embodiment, the one-way pressure relief device includes:

[0020] a baffle, covering the pressure relief port;

[0021] A mounting plate is connected to the baffle and the side wall of the wrapping structure respectively. The mounting plate is located on one side of the baffle along the target direction. The mounting plate and the baffle are arranged crosswise. The side of the baffle away from the mounting plate along the target direction is used to deform under the action of external force to approach or move away from the pressure relief port.

[0022] In the disclosed embodiment, the mounting plate is connected to the baffle and the side wall of the wrapping structure respectively, so that the baffle is supported on the wrapping structure through the mounting plate. The mounting plate is connected to the side wall of the wrapping structure, so that there is a large contact area between the one-way pressure relief device and the wrapping structure, which is conducive to a more secure connection between the one-way pressure relief device and the wrapping structure. Since the side of the baffle facing away from the mounting plate in the target direction is used to deform under the action of external force to move closer to or away from the pressure relief port, the side of the baffle facing away from the mounting plate in the target direction is not connected to the wrapping structure but can move relative to the wrapping structure. In the event of thermal runaway of the battery cells in the wrapping structure of the battery, the side of the baffle facing away from the mounting plate in the target direction is flushed open under the pressure of the thermal runaway ejecta in the first accommodation space to open the pressure relief port, thereby releasing pressure in the first accommodation space. The thermal runaway ejecta of the battery that has experienced thermal runaway in the battery pack will impact the baffle of the battery that has not experienced thermal runaway from the side of the corresponding baffle facing away from the pressure relief opening. Correspondingly, the side of the baffle facing away from the mounting plate along the target direction is pressed toward the pressure relief opening under the impact of the external thermal runaway ejecta, so that the baffle keeps covering the pressure relief opening.

[0023] In one embodiment, the mounting plate and the baffle are integrally formed.

[0024] In the disclosed embodiment, since the baffle and the mounting plate are integrally formed, the mounting plate can better support the baffle to produce elastic deformation, and the integrity of the baffle and the mounting plate is better.

[0025] In one embodiment, the baffle and the wrapping structure are abutted against or spaced apart at the pressure relief port.

[0026] In the disclosed embodiment, when the side of the baffle facing away from the pressure relief vent along the opening direction of the pressure relief vent is impacted by a thermally runaway ejecta, the baffle is spaced apart from the encapsulating structure, creating a buffer space between the two. This spaced-apart baffle can effectively cushion the impact of external thermally runaway ejecta. When the side of the baffle facing away from the pressure relief vent along the opening direction of the pressure relief vent is impacted by a thermally runaway ejecta, the baffle abuts the encapsulating structure at the pressure relief vent, allowing the encapsulating structure to effectively support the baffle.

[0027] In one embodiment, when projected along the opening direction of the pressure relief port, the projection area of ​​the pressure relief port is located within the projection area of ​​the baffle.

[0028] In the embodiment of the present disclosure, since the projection area of ​​the pressure relief port is located within the projection area of ​​the baffle, the baffle can better cover the pressure relief port, thereby reducing the possibility that thermal runaway ejecta outside the wrapping structure enter the first accommodation space through the pressure relief port and cause thermal runaway of battery cells in the first accommodation space that have not experienced thermal runaway.

[0029] In one embodiment, the baffle is in the shape of an elongated strip, and the width direction of the baffle is arranged along the target direction.

[0030] In the embodiment of the present disclosure, the width direction of the baffle is arranged along the target direction, the size of the baffle along the target direction is relatively small, and the force arm of the baffle deforming close to or away from the pressure relief port on the side away from the mounting plate along the target direction is relatively short, which is conducive to opening the pressure relief port in a limited space so that the first accommodation space can relieve pressure in the event of thermal runaway of the battery cell.

[0031] In one embodiment, the mounting plate is adhesively bonded to the wrapping structure.

[0032] In the disclosed embodiment, the mounting plate and the wrapping structure are glued together, so that the connection between the mounting plate and the wrapping structure is more convenient.

[0033] In one embodiment, the pressure relief assembly has a weakened portion, which is used to enable the pressure relief assembly to open the pressure relief port under the action of the air pressure in the first accommodating space to relieve pressure in the first accommodating space. The weakened portion is formed on the one-way pressure reliever, and the weakened portion is located on the side of the baffle toward the mounting plate along the target direction.

[0034] In the embodiment of the present disclosure, by arranging the weakened portion on the side of the baffle toward the mounting plate along the target direction, the weakened portion is close to the intersection position of the baffle and the mounting plate. The intersection position of the baffle and the mounting plate is easier to deform due to the arrangement of the weakened portion, which facilitates the baffle to approach or move away from the pressure relief port on the side away from the mounting plate along the target direction, thereby better relieving pressure in the first accommodating space.

[0035] In one embodiment, the weakened portion is a weakened hole, which is a through hole. The weakened hole penetrates the baffle along the thickness direction of the baffle and / or the weakened hole penetrates the mounting plate along the thickness direction of the mounting plate.

[0036] In the embodiment of the present disclosure, the one-way pressure reliever is weakened at the intersection of the mounting plate and the baffle by using a through hole as a weakening hole, so that the baffle is easier to deform relative to the mounting plate, which is beneficial to pressure relief in the first accommodating space.

[0037] In one embodiment, the intersection line formed by the surface of the baffle facing the wrapping structure and the surface of the mounting plate facing the wrapping structure is a preset intersection line, the weakened portion is a weakened hole, the number of the weakened holes is at least two, and at least two weakened holes are arranged at intervals along the preset intersection line.

[0038] In the embodiment of the present disclosure, since at least two weakened holes are arranged at intervals along the preset intersection line, the one-way pressure reliever can be weakened as much as possible along the preset intersection line near the intersection of the mounting plate and the baffle, so that the baffle can deform better relative to the mounting plate, which is conducive to the baffle opening the pressure relief port to relieve pressure in the first accommodating space.

[0039] In one embodiment, the packaging structure includes:

[0040] a housing, the pressure relief port being formed on one side of the housing, and the one-way pressure relief device being connected to the housing;

[0041] The top cover is installed on the shell, the top cover and the shell enclose a first accommodation space, and the conductive terminal is installed on the top cover.

[0042] In the disclosed embodiment, a pressure relief vent is formed in the housing, and conductive terminals are mounted on the top cover. The tabs of the battery cells can be first connected to the conductive terminals mounted on the top cover, and then the battery cells are placed into the housing and the top cover is mounted to the housing. This eliminates the need for assembly between the tabs and the conductive terminals within the housing, making connection between the tabs and the conductive terminals more convenient. A one-way pressure relief device connected to the housing can conveniently shield the pressure relief vent formed in the housing.

[0043] In one embodiment, the one-way pressure relief device is made of metal.

[0044] In the disclosed embodiment, the metal material has good ductility, allowing the one-way pressure relief device to deform well to open the pressure relief port and release pressure. Metal also has a certain impact resistance. In the event of an impact from a thermal runaway ejecta from outside the package structure, the metal one-way pressure relief device, shielded at the pressure relief port, can effectively resist the impact of the external thermal runaway ejecta, thereby preventing the external thermal runaway ejecta from entering the first containment space.

[0045] In one embodiment, the one-way pressure relief device is made of metal titanium or titanium alloy.

[0046] In the disclosed embodiment, metal titanium and titanium alloys have good high-temperature resistance and certain impact resistance. The one-way pressure relief device made of metal titanium or titanium alloy blocking the pressure relief port can better resist the impact of thermal runaway ejecta outside the package structure, and suppress the possibility of thermal runaway ejecta outside the package structure entering the first containment space.

[0047] In one embodiment, the melting point of the material of the one-way pressure relief device is greater than or equal to 1000°C.

[0048] In the embodiment of the present disclosure, since the melting point of the material of the one-way pressure relief device is greater than or equal to 1000°C, the one-way pressure relief device has good heat resistance and is not easily damaged by the impact of thermal runaway ejecta outside the package structure. This is beneficial for the one-way pressure relief device to better resist the impact of thermal runaway ejecta outside the package structure and suppress the possibility of thermal runaway ejecta outside the package structure entering the first containment space.

[0049] In one embodiment, the pressure relief assembly further includes a pressure relief cover, which is provided on the pressure relief port, the pressure relief cover is sealed with the wrapping structure, and the one-way pressure relief device is located inside the pressure relief cover, and the pressure bearing capacity of the pressure relief cover and the one-way pressure relief device are both less than the pressure bearing capacity of the wrapping structure.

[0050] In the disclosed embodiment, a pressure relief cover, positioned over the pressure relief port, covers the one-way pressure relief device, and the pressure relief cover is sealed to the encapsulation structure. This can, to a certain extent, suppress the possibility of thermal runaway ejecta from the encapsulation structure entering the first containment space from the pressure relief port through the gap between the one-way pressure relief device and the encapsulation structure, thereby facilitating the suppression of thermal runaway propagation. Because the pressure-bearing capacity of the pressure relief cover is lower than that of the encapsulation structure, thermal runaway ejecta within the first containment space can be effectively decompressed through the pressure relief port and the pressure relief cover.

[0051] In one embodiment, the pressure relief cover is made of mica.

[0052] In the disclosed embodiment, the mica pressure relief cover can be well-fitted to the package structure, facilitating a good seal between the pressure relief cover and the package structure. The mica used as the material for the pressure relief cover has certain flame retardant properties and can withstand high temperatures, effectively maintaining a good seal at the pressure relief port, and thus preventing the possibility of external thermal runaway ejecta from entering the first containment space.

[0053] In one embodiment, the pressure relief component is an insulating film, and the melting point of the insulating film is less than or equal to 500°C.

[0054] In the disclosed embodiments, during normal battery operation, the insulating film at the pressure relief vent serves to shield against external debris such as dust. Because the insulating film has a melting point of 500°C or less, if thermal runaway occurs within a battery cell within the battery's packaging structure, the insulating film can be melted through by the thermal runaway ejecta within the first accommodation space, facilitating rapid pressure relief within the first accommodation space.

[0055] In one embodiment, the pressure relief component has a weakened portion, and the weakened portion is used to enable the pressure relief component to open the pressure relief port under the action of the air pressure in the first accommodation space to relieve the pressure in the first accommodation space.

[0056] In the embodiment of the present disclosure, the strength of the pressure relief assembly is weakened by the weakening portion, so that the pressure relief assembly can be more easily deformed away from the pressure relief port to open the pressure relief port under the action of the thermal runaway eruption in the first accommodating space, thereby allowing the thermal runaway eruption in the first accommodating space to be better decompressed.

[0057] In one embodiment, the weakened portion is a weakened hole, and the pressure relief assembly has at least one row of weakened holes, with each row having at least two weakened holes.

[0058] In the embodiment of the present disclosure, there are at least two weakened holes in each row, so that the strength of the pressure relief assembly is weakened along the rows of weakened holes, which is conducive to the thermal runaway eruption in the first accommodation space breaking through the weakened part of the pressure relief assembly to achieve pressure relief in the first accommodation space.

[0059] In one embodiment, the weakened portion is a notch.

[0060] In the disclosed embodiment, the pressure relief assembly is weakened by a notch serving as a weakened portion, enabling the pressure relief assembly to open the pressure relief port and release pressure under the influence of thermal runaway ejecta within the first accommodation space. The notch serves as the weakened portion, making it easier to machine the weakened portion into the pressure relief assembly.

[0061] In one embodiment, the battery cell is a soft-pack battery cell.

[0062] A second aspect of the present disclosure provides a battery pack, including:

[0063] Box;

[0064] The battery of any of the preceding embodiments is located within the housing;

[0065] A third aspect of the present disclosure provides an electrical device, including:

[0066] Device body;

[0067] The battery pack of any of the aforementioned embodiments is installed in the device body to supply power to the device body.

[0068] In the battery provided by the embodiments of the present disclosure, in the event of thermal runaway of a battery cell within its packaging structure, due to the formation of a pressure relief vent connected to the first accommodation space on one side of the packaging structure, the generated thermal runaway gas faces significant resistance to escape from portions of the packaging structure other than the pressure relief vent, making it difficult for the thermal runaway gas to escape from the packaging structure other than the pressure relief vent. The packaging structure guides the thermal runaway gas to eject from the packaging structure through the pressure relief vent, thereby relieving pressure in the first accommodation space within the packaging structure and achieving a directional eruption of the thermal runaway gas. Because the conductive terminal and the pressure relief vent are located on different sides of the packaging structure, the thermal runaway gas ejected from the pressure relief vent and any substances carried by the thermal runaway gas can be kept as far away from the conductive terminal as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] FIG1 is a schematic structural diagram of a battery according to an embodiment of the present disclosure, showing an inlet and an outlet of a temperature regulating container extending out of a receiving space;

[0070] FIG2 is a schematic structural diagram of a battery according to an embodiment of the present disclosure, showing conductive terminals;

[0071] FIG3 is an exploded view of a battery according to an embodiment of the present disclosure;

[0072] FIG4 is an assembly diagram of a housing and an insulating layer according to an embodiment of the present disclosure;

[0073] FIG5 is a schematic diagram of position AA in FIG4 ;

[0074] FIG6 is an enlarged view of position B in FIG5;

[0075] FIG7 is a layout diagram of a temperature regulating container and a battery cell according to an embodiment of the present disclosure;

[0076] FIG8 is a schematic structural diagram of a temperature regulating container according to an embodiment of the present disclosure;

[0077] FIG9 is an assembly diagram of the top cover and the housing according to an embodiment of the present disclosure;

[0078] FIG10 is a layout diagram of at least two batteries arranged sequentially according to an embodiment of the present disclosure;

[0079] FIG11 is a schematic structural diagram of a battery pack according to an embodiment of the present disclosure, showing an insulating layer but not a cover;

[0080] FIG12 is an exploded schematic diagram of a battery pack according to an embodiment of the present disclosure, wherein the box cover is not shown;

[0081] FIG13 is a schematic structural diagram of a main box according to an embodiment of the present disclosure;

[0082] FIG14 is a schematic structural diagram of a battery pack according to an embodiment of the present disclosure, showing a box cover;

[0083] FIG15 is a schematic structural diagram of a battery pack according to an embodiment of the present disclosure, showing the cross-sectional position of the battery pack;

[0084] FIG16 is a cross-sectional view at position CC in FIG15;

[0085] FIG17 is an enlarged view of position D in FIG16;

[0086] FIG18 is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure, in which the electrode assembly is not shown;

[0087] FIG19 is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure, showing an electrode assembly;

[0088] FIG20 is an exploded schematic diagram of a battery unit according to an embodiment of the present disclosure;

[0089] FIG21 is a diagram illustrating the arrangement of a temperature regulating container and soft-pack cells in a battery unit according to an embodiment of the present disclosure;

[0090] FIG22 is an assembly diagram of the top cover and the main shell of the embodiment of the present disclosure, showing the gap between the flange of the top cover and the side wall of the main shell.

[0091] FIG23 is a schematic structural diagram of a battery according to an embodiment of the present disclosure, showing a pressure relief assembly, a target direction, and a pressure relief direction of a pressure relief port.

[0092] FIG24 is an exploded view of a battery according to an embodiment of the present disclosure, in which the pressure relief assembly includes a one-way pressure relief device and a pressure relief cover;

[0093] FIG25 is an enlarged view of position E in FIG24;

[0094] FIG26 is a schematic structural diagram of a one-way pressure relief device according to an embodiment of the present disclosure;

[0095] FIG27 is an enlarged view of position F in FIG26;

[0096] FIG28 is a schematic structural diagram of a battery according to an embodiment of the present disclosure, in which the pressure relief component is an insulating film or a metal plate;

[0097] FIG29 is an exploded view of a battery according to an embodiment of the present disclosure, in which the pressure relief component is an insulating film or a metal plate;

[0098] FIG30 is a schematic structural diagram of a pressure relief assembly according to an embodiment of the present disclosure, showing notches on the pressure relief assembly;

[0099] FIG31 is a cross-sectional view at position GG in FIG30 ;

[0100] FIG32 is an enlarged view of position H in FIG31.

[0101] Explanation of the accompanying symbols 1. Wrapping structure; 11. First storage space; 12. Pressure relief port; 13. Shell; 131. Bending plate; 14. Top cover; 141. Flanged edge; 15. First insulating layer; 2. Conductive terminal; 21. Transfer electrode; 22. Sampling electrode; 3. Battery cell; 31. Tab; 4. Flame retardant cover; 41. Notch; 42. Through hole; 5. Temperature control container; 51. Temperature control chamber; 52. Inlet; 53. Outlet; 54. Container body; 55. First guide plate; 56. Second guide plate; 6. Reinforcement plate; 100. Battery; 901. Box body; 902. Second storage space space; 903, target side wall; 904, exhaust flow channel; 905, exhaust hole; 906, wall body; 907, reinforcement rib; 908, weight reduction cavity; 909, main box; 910, first protrusion; 911, second protrusion; 912, box cover; 913, sealing part; 201, first battery cell; 202, second battery cell; 914, second insulating layer; 915, battery module; 916, explosion-proof valve; 917, pressure relief assembly; 918, one-way pressure relief device; 919, baffle; 920, mounting plate; 921, weakened part; 922, preset intersection line; 923, pressure relief cover. DETAILED DESCRIPTION

[0102] The following embodiments of the technical solution of the present disclosure are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present disclosure and are therefore only examples and are not intended to limit the scope of protection of the present disclosure.

[0103] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this disclosure; the terms "including" and "having" of the embodiments of this disclosure and any variations thereof are intended to cover non-exclusive inclusions.

[0104] In the description of the embodiments of the present disclosure, technical terms such as "first," "second," and "third" are used solely to distinguish different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0105] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0106] In the description of the embodiments of the present disclosure, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0107] In the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0108] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0109] In the related art, when a battery experiences thermal runaway, the thermal runaway gas of the battery will erupt in all directions with an uncertain eruption direction. The battery does not have a structure to guide the thermal runaway gas to erupt in a preset direction.

[0110] In the embodiment of the present disclosure, a pressure relief vent is provided on the wrapping structure, and the thermal runaway gas of the battery cell in the accommodation space is guided by the wrapping structure to be ejected from the pressure relief vent in a preset direction. This preset direction is the direction of the wrapping structure toward the pressure relief vent, so that the ejection direction of the thermal runaway gas of the battery can be set according to actual needs.

[0111] The battery provided by the embodiments of the present disclosure can be used, but is not limited to, in energy storage power supply systems, vehicles, ships, aircraft and other electrical devices.

[0112] The batteries provided in the embodiments of the present disclosure can also be grouped together to form a battery pack. The battery pack can also be used, but is not limited to, in energy storage power systems, vehicles, ships, aircraft, and other electrical devices. The use of a battery pack can provide a higher total energy. Furthermore, the battery pack is formed by placing multiple grouped batteries in a sealed box, thereby providing more reliable dust and water resistance, and can therefore be used in harsher, humid, and even submerged environments.

[0113] There can be multiple battery cells, and these cells can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of both series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid configuration to form a battery pack. Of course, multiple battery cells can first be connected in series, in parallel, or in a hybrid configuration to form a battery module, which can then be connected in series, in parallel, or in a hybrid configuration to form a battery pack. A battery pack may also include other structures, such as a busbar assembly for electrically connecting multiple battery cells.

[0114] A battery cell refers to the basic unit that can realize the mutual conversion of chemical energy and electrical energy.

[0115] In the embodiment of the present disclosure, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0116] In the embodiments of the present disclosure, the battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., but the embodiments of the present disclosure are not limited to this.

[0117] The embodiments of the present disclosure provide an electrical device including the above-mentioned battery or battery pack for providing electrical energy. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0118] The electric device of the embodiment of the present disclosure includes a device body and a battery pack, and the battery pack is installed in the device body to supply power to the device body.

[0119] In the embodiment of the present disclosure, power is supplied to the device body through the battery pack, so that the device body obtains the electrical energy required to maintain normal operation.

[0120] The battery pack of the embodiment of the present disclosure includes a box body and a battery 100 , wherein the battery 100 is located in the box body.

[0121] In the embodiment of the present disclosure, the battery 100 is located in the box, and the box and the battery 100 in the box supply power to the outside as a whole. The box can better protect the battery 100 in the box.

[0122] First embodiment:

[0123] The battery 100 of the embodiment of the present disclosure, referring to Figures 1 to 3, 18 to 20, 23 to 25, and 28 and 29, includes a wrapping structure 1, a conductive terminal 2, and a battery cell 3. The wrapping structure 1 forms a first accommodating space 11, and a pressure relief vent 12 connected to the first accommodating space 11 is formed on one side of the wrapping structure 1, and the rest of the wrapping structure 1 is a sealed structure. The conductive terminal 2 is connected to the wrapping structure 1, and the conductive terminal 2 and the pressure relief vent 12 are located on different sides of the wrapping structure 1. The battery cell 3 is located in the first accommodating space 11, and the tab 31 of the battery cell 3 is electrically connected to the conductive terminal 2.

[0124] The wrapping structure 1 is a structure wrapped around the battery cell 3 , and the first accommodation space 11 of the wrapping structure 1 is mainly used to accommodate the battery cell 3 .

[0125] The conductive terminal 2 is electrically connected to the tab 31 of the battery cell 3 . The battery cell 3 is powered externally through the conductive terminal 2 , or an external power source is powered externally through the conductive terminal 2 .

[0126] For example, the conductive terminal 2 is a tab, and the multiple batteries 100 in the battery pack are connected in series, in parallel, or in mixed series via the tab.

[0127] Exemplarily, the battery cell 3 includes a bare cell and an outer packaging wrapped around the bare cell for protecting the bare cell. The bare cell includes a positive electrode sheet, a negative electrode sheet, and a separator located between the positive electrode sheet and the negative electrode sheet.

[0128] A pressure relief vent 12 connected to the first accommodating space 11 is formed on one side of the wrapping structure 1. The rest of the wrapping structure 1 is a sealed structure, meaning that the portion of the wrapping structure 1 covering the battery cell 3, except for the pressure relief vent 12, is substantially sealed. In other words, the portion of the wrapping structure 1 covering the battery cell 3, except for the pressure relief vent 12, can be completely sealed or partially sealed. In the event that the portion of the wrapping structure 1 covering the battery cell 3, except for the pressure relief vent 12, is not completely sealed, as long as the gap at the incompletely sealed portion of the wrapping structure 1 can suppress the eruption of thermal runaway gases from the incompletely sealed portion of the wrapping structure 1 to a certain extent, thereby guiding the thermal runaway gases to erupt from the pressure relief vent 12.

[0129] The conductive terminal 2 and the pressure relief vent 12 are located on different sides of the package structure 1 , and the thermal runaway gas ejected from the pressure relief vent 12 can be as far away from the conductive terminal 2 as possible.

[0130] For example, the number of battery cells 3 in the packaging structure 1 may be one or at least two.

[0131] In the disclosed embodiment, if thermal runaway occurs in a battery cell 3 within the packaging structure 1 of the battery 100, due to the pressure relief vent 12 formed on one side of the packaging structure 1, which is connected to the first accommodation space 11, the generated thermal runaway gas faces significant resistance to escape from other portions of the packaging structure 1 except the pressure relief vent 12. This makes it difficult for the thermal runaway gas to escape from the packaging structure 1 except for the pressure relief vent 12. The packaging structure 1 guides the thermal runaway gas to eject from the packaging structure 1 through the pressure relief vent 12, thereby relieving the pressure in the first accommodation space 11 within the packaging structure 1 and achieving a directional eruption of the thermal runaway gas. Because the conductive terminal 2 and the pressure relief vent 12 are located on different sides of the packaging structure 1, the thermal runaway gas ejected from the pressure relief vent 12 and the substances carried by the thermal runaway gas can be kept as far away from the conductive terminal 2 as possible.

[0132] In one embodiment, referring to Figures 1 to 3, 18 to 20, 23 to 25, and 28 and 29, the battery 100 further includes a pressure relief assembly 917 connected to the wrapping structure 1, the pressure relief assembly 917 covers the pressure relief port 12 to shield the pressure relief port 12, and the pressure relief assembly 917 is used to open the pressure relief port 12 under the action of the air pressure in the first accommodation space 11 to relieve the pressure in the first accommodation space 11.

[0133] The pressure relief assembly 917 is a structure that blocks the pressure relief port 12 and can open the pressure relief port 12 under the action of the pressure in the first accommodation space 11 .

[0134] Exemplarily, the pressure bearing capacity of the package structure 1 is greater than the pressure bearing capacity of the pressure relief component 917 .

[0135] The relative size of the pressure bearing capacity can be measured by filling gas into the package structure 1. Specifically, because the pressure relief component 917 covers the pressure relief port 12, the package structure 1 and the pressure relief component 917 substantially seal the first accommodation space 11. When gas is filled into the first accommodation space 11, the air pressure in the first accommodation space 11 continuously increases, and the gas pressure borne by the package structure 1 and the pressure relief component 917 continuously increases. In the process of continuously filling the first accommodation space 11 with gas, the pressure relief component 917 undergoes significant deformation or damage before the package structure 1, causing the pressure relief port 12 to be in an open state. That is, the pressure bearing capacity of the pressure relief component 917 is less than that of the package structure 1, and the pressure bearing capacity of the package structure 1 is greater than that of the pressure relief component 917.

[0136] In the disclosed embodiment, when the battery 100 is operating normally, the pressure relief assembly 917 covers the pressure relief port 12, shielding the pressure relief port 12. This prevents external debris from entering the first storage space 11 and, to a certain extent, reduces the possibility of structures within the first storage space 11 escaping from the pressure relief port 12. If a battery cell 3 within the packaging structure 1 of the battery 100 experiences thermal runaway, a large amount of thermal runaway ejecta accumulates within the first storage space 11, increasing the pressure within the first storage space 11. If the pressure relief assembly 917 can no longer withstand the pressure within the first storage space 11, the thermal runaway ejecta within the first storage space 11 will break through the pressure relief assembly 917 and be ejected from the pressure relief port 12, depressurizing the first storage space 11. The pressure relief assembly 917 effectively prevents external debris from entering the first storage space 11, protecting the structures within the first storage space 11, while also allowing pressure relief under the action of the air pressure within the first storage space 11.

[0137] It is understood that the structure of the battery 100 is not limited. For example, the battery 100 may not be provided with the pressure relief assembly 917, and the pressure relief port 12 is in an open state.

[0138] In one embodiment, please refer to Figures 24 to 27, the pressure relief assembly 917 includes a one-way pressure relief device 918, which is covered on the pressure relief port 12 to block the pressure relief port 12. The one-way pressure relief device 918 is used to open the pressure relief port 12 under the action of the air pressure in the first accommodating space 11 to relieve the pressure in the first accommodating space 11. The one-way pressure relief device 918 is also used to press toward the pressure relief port 12 under the action of the force on the side of the one-way pressure relief device 918 away from the pressure relief port 12 to keep the pressure relief port 12 blocked.

[0139] The one-way pressure relief device 918 here refers to the one-way pressure relief device 918 that can be pushed outward under the action of the air pressure in the first accommodating chamber to open the pressure relief port 12, but the external thermal runaway ejecta on the side of the one-way pressure relief device 918 away from the pressure relief device cannot push the one-way pressure relief device 918 inward toward the first accommodating space 11 to open the pressure relief port 12.

[0140] Exemplarily, the pressure bearing capacity of the package structure 1 is greater than the pressure bearing capacity of the one-way pressure relief device 918 .

[0141] The relative size of the pressure bearing capacity can be measured by filling gas into the package structure 1. Specifically, since the one-way pressure relief device 918 is covered on the pressure relief port 12, the package structure 1 and the one-way pressure relief device 918 substantially seal the first accommodation space 11. When gas is filled into the first accommodation space 11, the air pressure in the first accommodation space 11 continuously increases, and the gas pressure borne by the package structure 1 and the one-way pressure relief device 918 continuously increases. In the process of gas continuously filling the first accommodation space 11, the one-way pressure relief device 918 undergoes significant deformation or damage before the package structure 1, or the one-way pressure relief device 918 moves away from the pressure relief port 12 under the action of the air pressure in the first accommodation space 11, so that the pressure relief port 12 is in an open state. That is, the pressure bearing capacity of the one-way pressure relief device 918 is less than that of the package structure 1, and the pressure bearing capacity of the package structure 1 is greater than that of the one-way pressure relief device 918.

[0142] Illustratively, the one-way pressure relief device 918 corresponding to the battery 100 that has not experienced thermal runaway is pressed toward the pressure relief device 12 under the impact of the thermal runaway eruption on the side away from the pressure relief device 12. The one-way pressure relief device 918 pressed toward the pressure relief device 12 is supported at the pressure relief device 12 by the wrapping structure 1, so that the pressure relief device keeps covering the pressure relief device 12.

[0143] In the embodiment of the present disclosure, when a thermal runaway occurs in the battery cell 3 in the battery 100 where the one-way pressure relief device 918 is located, the thermal runaway ejecta accumulated in the first accommodating space 11 generates a large air pressure to break open the one-way pressure relief device 918, causing the thermal runaway ejecta to be released from the pressure relief port 12. When thermal runaway occurs in other batteries 100 in the battery pack, the ejecta of thermal runaway impact the battery 100 that has not experienced thermal runaway from the side of the one-way pressure relief device 918 away from the pressure relief port 12. The one-way pressure relief device 918 corresponding to the battery 100 that has not experienced thermal runaway is pressed toward the pressure relief port 12 under the impact of the ejecta of thermal runaway on the side away from the pressure relief port 12, so that the one-way pressure relief device 918 keeps blocking the pressure relief port 12, reducing the possibility that the ejecta of thermal runaway on the side of the one-way pressure relief device 918 away from the pressure relief port 12 enters the first accommodating space 11 and causes the battery cell 3 to experience thermal runaway under the influence of the ejecta of thermal runaway, thereby better suppressing the spread of thermal runaway.

[0144] It is understandable that the pressure relief component 917 is not limited to the one-way pressure relief device 918. For example, the pressure relief component 917 can open the pressure relief port 12 inwardly toward the first accommodation space 11 under the action of a force on a side away from the pressure relief port 12.

[0145] In one embodiment, please refer to Figures 24 to 27, the one-way pressure relief device 918 is connected to the wrapping structure 1 on one side along the target direction, and the one-way pressure relief device 918 is used to deform under the action of external force to move closer to or away from the pressure relief port 12 on the other side along the target direction, and the target direction and the opening direction of the pressure relief port 12 are arranged crosswise.

[0146] For example, referring to FIG. 23 to FIG. 26 , the target direction is the direction indicated by the arrow R5 in the figure.

[0147] For example, referring to FIG. 23 to FIG. 25 , the opening direction of the pressure relief port 12 is the direction indicated by the arrow R6 in the figures.

[0148] Exemplarily, the target direction is perpendicular to the opening direction of the pressure relief port 12 .

[0149] For example, the pressure relief port 12 is in a square shape, and the target direction may be the length direction or the width direction of the square pressure relief port 12 .

[0150] Exemplarily, the one-way pressure relief device 918 is bonded to the packaging structure 1 .

[0151] Exemplarily, when the one-way pressure relief device 918 is pressed inward toward the first accommodating space 11 toward the pressure relief port 12 on the other side of the target direction under the action of the thermal runaway ejecta on the side of the one-way pressure relief device 918 facing away from the first accommodating space 11, the one-way pressure relief device 918 is supported on the wrapping structure 1 along the other side of the target direction.

[0152] Exemplarily, the one-way pressure relief devices 918 are arranged across the side walls of the packaging structure 1 on opposite sides along the target direction.

[0153] In the disclosed embodiment, if a battery cell 3 within the packaging structure 1 of a battery 100 experiences thermal runaway, the one-way pressure relief device 918 deforms outwardly away from the pressure relief port 12 along the other side of the target direction under the pressure of the thermal runaway ejecta accumulated in the first accommodating space 11, thereby opening the pressure relief port 12 and releasing pressure within the first accommodating space 11. If a battery cell 3 within the packaging structure 1 of another battery cell 100 within the battery pack experiences thermal runaway, the one-way pressure relief device 918 corresponding to the battery cell 100 within the battery pack that has not experienced thermal runaway deforms inward toward the pressure relief port 12 along the other side of the target direction under the impact of the thermal runaway ejecta on the side away from the pressure relief port 12, causing the one-way pressure relief device 918 to press against the pressure relief port 12 along the other side of the target direction, thereby maintaining the one-way pressure relief device 918 covering the pressure relief port 12.

[0154] It is understood that the specific structure of the one-way pressure relief device 918 is not limited. For example, the one-way pressure relief device 918 can be connected to the package structure 1 on two opposite sides along the target direction, and the one-way pressure relief device 918 can deform near the middle position along the target direction to move closer to or away from the pressure relief port 12, thereby maintaining the pressure relief port 12 blocked or achieving pressure relief at the pressure relief port 12.

[0155] In one embodiment, referring to Figures 24-27 , a one-way pressure relief device 918 includes a baffle 919 and a mounting plate 920 . The baffle 919 covers the pressure relief port 12 . The mounting plate 920 is connected to the baffle 919 and the sidewall of the package structure 1 , respectively. The mounting plate 920 is located on one side of the baffle 919 in the target direction, and the mounting plate 920 and the baffle 919 are arranged crosswise. The side of the baffle 919 facing away from the mounting plate 920 in the target direction is configured to deform under external force to move closer to or further from the pressure relief port 12 .

[0156] Exemplarily, the baffles 919 are arranged across the side walls of the packaging structure 1 on opposite sides along the target direction.

[0157] Exemplarily, the mounting plate 920 is bonded or welded to the packaging structure 1 .

[0158] For example, the mounting plate 920 may be connected to the side of the sidewall of the wrapping structure 1 facing the first accommodating space 11 , or the mounting plate 920 may be connected to the side of the sidewall of the wrapping structure 1 facing away from the first accommodating space 11 .

[0159] Illustratively, the mounting plate 920 and the baffle 919 are both flat plates.

[0160] Illustratively, the mounting plate 920 is arranged perpendicular to the baffle 919 .

[0161] Exemplarily, the one-way pressure relief device 918 is L-shaped.

[0162] Exemplarily, the side of the baffle 919 that is away from the pressure relief port 12 along the opening direction of the pressure relief port 12 is impacted by the thermal runaway ejecta from outside the wrapping structure 1, and the side of the baffle 919 that is away from the mounting plate 920 along the target direction is pressed toward the pressure relief port 12 under the impact of the thermal runaway ejecta from outside the wrapping structure 1, and the side of the baffle 919 that is away from the mounting plate 920 along the target direction is supported by the side wall of the wrapping structure 1 so that the baffle 919 keeps covering the pressure relief port 12.

[0163] In the disclosed embodiment, the mounting plate 920 is connected to the baffle 919 and the sidewall of the wrapping structure 1, respectively, so that the baffle 919 is supported on the wrapping structure 1 through the mounting plate 920. The mounting plate 920 is connected to the sidewall of the wrapping structure 1, thereby providing a larger contact area between the one-way pressure relief device 918 and the wrapping structure 1, thereby facilitating a more secure connection between the one-way pressure relief device 918 and the wrapping structure 1. Because the side of the baffle 919 facing away from the mounting plate 920 in the target direction is designed to deform toward or away from the pressure relief vent 12 under the action of an external force, the side of the baffle 919 facing away from the mounting plate 920 in the target direction is not connected to the wrapping structure 1 but is movable relative to the wrapping structure 1. In the event of thermal runaway of a battery cell 3 within the wrapping structure 1 of the battery 100, the side of the baffle 919 facing away from the mounting plate 920 in the target direction is displaced by the pressure of the thermal runaway ejecta within the first accommodating space 11, thereby opening the pressure relief vent 12 and releasing pressure within the first accommodating space 11. The thermal runaway ejecta of the battery 100 that has experienced thermal runaway in the battery pack will impact the baffle 919 of the battery 100 that has not experienced thermal runaway from the side of the corresponding baffle 919 facing away from the pressure relief opening. Correspondingly, the side of the baffle 919 that faces away from the mounting plate 920 along the target direction is pressed toward the pressure relief opening 12 under the impact of the external thermal runaway ejecta, so that the baffle 919 keeps covering the pressure relief opening 12.

[0164] It is understood that the specific structure of the one-way pressure relief device 918 is not limited. For example, the baffle 919 can be connected to the packaging structure 1. For example, the baffle 919 can be integrally formed with the packaging structure 1. For example, the baffle 919 can be bonded or welded to the packaging structure 1.

[0165] In one embodiment, referring to FIG. 24 to FIG. 27 , the mounting plate 920 and the baffle 919 are integrally formed.

[0166] For example, a sheet of material may be bent to form the mounting plate 920 and the baffle 919 .

[0167] Illustratively, a metal sheet is bent to form the mounting plate 920 and the baffle 919 .

[0168] In the embodiment of the present disclosure, since the baffle 919 and the mounting plate 920 are integrally formed, the mounting plate 920 can better support the baffle 919 to produce elastic deformation, and the integrity of the baffle 919 and the mounting plate 920 is better.

[0169] It is understood that the specific structure of the one-way pressure relief device 918 is not limited. For example, the baffle 919 is welded or bolted to the mounting plate 920.

[0170] In one embodiment, the baffle 919 and the wrapping structure 1 are spaced apart at the pressure relief port 12 .

[0171] In the embodiment of the present disclosure, when the baffle 919 is located along the opening direction of the pressure relief port 12 and is away from the side of the pressure relief port 12, in the event of an impact of thermal runaway ejecta, since the baffle 919 is spaced apart from the wrapping structure 1, there is a certain buffer space between the baffle 919 and the wrapping structure 1. The baffle 919 spaced apart from the wrapping structure 1 can better buffer the impact of external thermal runaway ejecta.

[0172] In one embodiment, the baffle 919 abuts against the packaging structure 1 at the pressure relief port 12 .

[0173] In the embodiment of the present disclosure, when the baffle 919 is on the side facing away from the pressure relief port 12 along the opening direction of the pressure relief port 12 and in the event of impact from the eruption of thermal runaway, the baffle 919 abuts against the wrapping structure 1 at the pressure relief port 12, so that the wrapping structure 1 can better support the baffle 919.

[0174] In one embodiment, referring to FIG. 24 and FIG. 25 , when projected along the opening direction of the pressure relief port 12 , the projection area of ​​the pressure relief port 12 is located within the projection area of ​​the baffle 919 .

[0175] It should be noted that the projection area of ​​the pressure relief port 12 is located within the projection area of ​​the baffle 919, and the outer contour of the projection area of ​​the pressure relief port 12 and the outer contour of the projection area of ​​the baffle 919 can overlap, as long as the projection area of ​​the pressure relief port 12 does not exceed the projection area of ​​the baffle 919.

[0176] In the embodiment of the present disclosure, since the projection area of ​​the pressure relief port 12 is located within the projection area of ​​the baffle 919, the baffle 919 can better cover the pressure relief port 12, thereby reducing the possibility that thermal runaway ejecta outside the wrapping structure 1 enter the first accommodating space 11 through the pressure relief port 12 and cause thermal runaway of the battery cells 3 in the first accommodating space 11 that have not experienced thermal runaway.

[0177] It is understandable that the specific positions of the pressure relief port 12 and the baffle 919 are not limited. For example, when projected along the opening direction of the pressure relief port 12, the projection area of ​​the pressure relief port 12 can be partially located outside the projection area of ​​the baffle 919.

[0178] In one embodiment, referring to FIG. 24 to FIG. 27 , the baffle 919 is in the shape of an elongated strip, and the width direction of the baffle 919 is arranged along the target direction.

[0179] The baffle 919 is in the shape of an elongated strip, and the length of the baffle 919 is greater than the width of the baffle 919 .

[0180] In the embodiment of the present disclosure, the width direction of the baffle 919 is arranged along the target direction, the size of the baffle 919 along the target direction is relatively small, and the force arm of the baffle 919 deforming close to or away from the pressure relief port 12 on the side away from the mounting plate 920 along the target direction is relatively short, which is conducive to opening the pressure relief port 12 in a limited space to allow the first accommodating space 11 to relieve pressure in the event of thermal runaway of the battery cell 3.

[0181] It is understood that the arrangement of the target directions is not limited. For example, the target directions can be arranged along the length direction of the baffle 919.

[0182] In one embodiment, referring to FIG. 24 and FIG. 25 , the mounting plate 920 is glued to the wrapping structure 1 .

[0183] In the embodiment of the present disclosure, the mounting plate 920 is glued to the wrapping structure 1 , so that the connection between the mounting plate 920 and the wrapping structure 1 is more convenient.

[0184] It is understood that there is no limitation on the connection method between the mounting plate 920 and the wrapping structure 1. For example, the mounting plate 920 can be welded to the wrapping structure 1 as appropriate.

[0185] In one embodiment, please refer to Figures 26 and 27, the pressure relief assembly 917 has a weakened portion 921, which is used to enable the pressure relief assembly 917 to open the pressure relief port 12 under the action of the air pressure in the first accommodating space 11 to relieve pressure in the first accommodating space 11. The weakened portion 921 is formed in the one-way pressure reliever 918, and the weakened portion 921 is located on the side of the baffle 919 toward the mounting plate 920 along the target direction.

[0186] The weakened portion 921 is a locally weakened portion of the pressure relief component 917 . The weakened portion 921 is more easily broken open or deformed than other portions of the pressure relief component 917 .

[0187] Illustratively, the weakened portion 921 is a portion of the pressure relief assembly 917 where the thickness is reduced.

[0188] In the embodiment of the present disclosure, by arranging the weakened portion 921 on the side of the baffle 919 toward the mounting plate 920 along the target direction, the weakened portion 921 is close to the intersection position of the baffle 919 and the mounting plate 920. The intersection position of the baffle 919 and the mounting plate 920 is easier to deform due to the arrangement of the weakened portion 921, which facilitates the baffle 919 to approach or move away from the pressure relief port 12 along the target direction away from the side of the mounting plate 920, thereby better relieving pressure in the first accommodating space 11.

[0189] It is understood that the specific location of the weakened portion 921 is not limited. For example, mounting plates 920 connected to the wrapping structure 1 are provided on opposite sides of the baffle 919 along the target direction. The weakened portion 921 may be located approximately near the center of the pressure relief port 12 on the baffle 919 along the target direction. For example, the mounting plate 920 is located on one side of the baffle 919 along the target direction, and the weakened portion 921 may be located on the side of the baffle 919 facing away from the mounting plate 920 along the target direction.

[0190] In one embodiment, referring to Figures 26 and 27, the weakened portion 921 is a weakened hole, which is a through hole. The weakened hole penetrates the baffle 919 along the thickness direction of the baffle 919 and / or the weakened hole penetrates the mounting plate 920 along the thickness direction of the mounting plate 920.

[0191] Illustratively, the weakened hole penetrates the baffle 919 along the thickness direction of the baffle 919 .

[0192] Illustratively, the weakened hole penetrates the mounting plate 920 along the thickness direction of the mounting plate 920 .

[0193] Exemplarily, the one-way pressure reliever 918 is plate-shaped, the weakened hole penetrates the one-way pressure reliever 918 along the thickness direction of the one-way pressure reliever 918, the weakened hole spans the baffle 919 and the mounting plate 920, and the weakened hole penetrates the baffle 919 and the mounting plate 920.

[0194] It should be noted that the weakened hole being a through hole is a special case of thickness thinning. The weakened hole on the pressure relief component 917 is a through hole, that is, the thickness of the pressure relief component 917 at the weakened hole is thinned to zero.

[0195] In the embodiment of the present disclosure, the one-way pressure reliever 918 is weakened at the position where the mounting plate 920 and the baffle 919 intersect by a through hole serving as a weakening hole, so that the baffle 919 is easier to deform relative to the mounting plate 920, which is beneficial to pressure relief in the first accommodating space 11.

[0196] It is understood that the weakened portion 921 is not necessarily a through hole. For example, the weakened portion 921 can be a blind hole. For example, the weakened portion 921 can be a weakened hole, and the weakened hole can be a blind hole.

[0197] In one embodiment, referring to Figures 26 and 27, the intersection line formed by the surface of the baffle 919 facing the wrapping structure 1 and the surface of the mounting plate 920 facing the wrapping structure 1 is a preset intersection line 922, the weakened portion 921 is a weakened hole, the number of the weakened holes is at least two, and at least two weakened holes are arranged at intervals along the preset intersection line 922.

[0198] Exemplarily, the surface of the baffle 919 facing the wrapping structure 1 is a plane, the surface of the mounting plate 920 facing the wrapping structure 1 is a plane, and the preset intersection line 922 is a straight line.

[0199] In the embodiment of the present disclosure, since at least two weakened holes are arranged at intervals along the preset intersection line 922, the one-way pressure relief device 918 can be weakened as much as possible along the preset intersection line 922 near the intersection of the mounting plate 920 and the baffle 919, so that the baffle 919 can be better deformed relative to the mounting plate 920, which is conducive to the baffle 919 opening the pressure relief port 12 to relieve pressure in the first accommodating space 11.

[0200] It is understandable that the arrangement of the weakened holes is not limited. For example, the arrangement direction of at least two weakened holes intersects with the preset intersection line 922.

[0201] In one embodiment, referring to Figures 23, 24, 28, and 29, the package structure 1 includes a housing 13 and a top cover 14. A pressure relief vent 12 is formed on one side of the housing 13, and a one-way pressure relief device 918 is connected to the housing 13. The top cover 14 is mounted on the housing 13, and the top cover 14 and the housing 13 enclose a first accommodation space 11, to which the conductive terminal 2 is mounted.

[0202] Exemplarily, the pressure relief assembly 917 is connected to the housing 13 .

[0203] Exemplarily, the one-way pressure relief device 918 is connected to the housing 13 along one side of the target direction.

[0204] Exemplarily, the one-way pressure relief device 918 is connected to the side wall of the housing 13 along one side of the target direction.

[0205] Exemplarily, the one-way pressure relief device 918 is arranged in contact with or spaced apart from the housing 13 at the pressure relief port 12 along the other side of the target direction.

[0206] Exemplarily, the mounting plate 920 is connected to the housing 13 .

[0207] Exemplarily, the mounting plate 920 is connected to a side wall of the housing 13 .

[0208] Exemplarily, the mounting plate 920 is bonded to the housing 13 .

[0209] Exemplarily, the top cover 14 is arranged opposite to the pressure relief port 12 .

[0210] For example, the material of the housing 13 may be metal.

[0211] For example, the material of the top cover 14 may be plastic.

[0212] Exemplarily, the top cover 14 and the housing 13 are bonded together.

[0213] The top cover 14 is installed on the housing 13 . The top cover 14 and the housing 13 are two independently manufactured parts. After the top cover 14 and the housing 13 are manufactured, the top cover 14 is installed on the housing 13 .

[0214] In the disclosed embodiment, the pressure relief vent 12 is formed in the housing 13, and the conductive terminal 2 is mounted on the top cover 14. The tab 31 of the battery cell 3 can first be connected to the conductive terminal 2 mounted on the top cover 14, and then the battery cell 3 is placed in the housing 13 and the top cover 14 is mounted on the housing 13. The assembly between the tab 31 of the battery cell 3 and the conductive terminal 2 is no longer restricted by the limited space in the housing 13, making the connection between the tab 31 of the battery cell 3 and the conductive terminal 2 more convenient. The one-way pressure relief device 918 connected to the housing 13 can more conveniently cover the pressure relief vent 12 formed in the housing 13.

[0215] It is understood that the specific structure of the package structure 1 is not limited. For example, the package structure 1 may not be provided with a top cover 14 , and the conductive terminal 2 is installed in the housing 13 .

[0216] In one embodiment, the one-way pressure relief device 918 is made of metal.

[0217] In the disclosed embodiment, the metal material has good ductility, allowing the one-way pressure relief device 918 to deform well to open the pressure relief port 12 for pressure relief. Metal also has a certain impact resistance. In the event of an impact from a thermal runaway ejection from outside the package structure 1, the metal one-way pressure relief device 918, shielded at the pressure relief port 12, can effectively resist the impact of the external thermal runaway ejection, thereby preventing the thermal runaway ejection from outside the package structure 1 from entering the first accommodation space 11.

[0218] In one embodiment, the one-way pressure relief device 918 is made of titanium or titanium alloy.

[0219] In the embodiment of the present disclosure, metal titanium and titanium alloys have good high-temperature resistance and certain impact resistance. The one-way pressure relief device 918 made of metal titanium or titanium alloy blocking the pressure relief port 12 can better resist the impact of thermal runaway ejecta outside the package structure 1, and suppress the possibility of thermal runaway ejecta outside the package structure 1 entering the first accommodating space 11.

[0220] In one embodiment, the melting point of the material of the one-way pressure relief device 918 is greater than or equal to 1000°C.

[0221] Materials with a melting point greater than or equal to 1000°C have better heat resistance.

[0222] Exemplarily, the material having a melting point greater than or equal to 1000° C. may be a non-metallic material.

[0223] For example, the melting point of the material of the one-way pressure reliever 918 may be 1000°C, 1100°C, 1200°C, 1300°C, 1400°C, 1500°C, 1600°C, 1668°C, 1700°C, or 1800°C.

[0224] In the embodiment of the present disclosure, since the melting point of the material of the one-way pressure relief device 918 is greater than or equal to 1000°C, the one-way pressure relief device 918 has good heat resistance and is not easily damaged by the impact of thermal runaway ejecta outside the package structure 1. This is beneficial for the one-way pressure relief device 918 to better resist the impact of thermal runaway ejecta outside the package structure 1 and suppress the possibility of thermal runaway ejecta outside the package structure 1 entering the first accommodating space 11.

[0225] In one embodiment, please refer to Figures 24 and 25, the pressure relief assembly 917 also includes a pressure relief cover 923, which is provided on the pressure relief port 12, and the pressure relief cover 923 is sealed with the wrapping structure 1, and the one-way pressure relief device 918 is located in the pressure relief cover 923, and the pressure bearing capacity of the pressure relief cover 923 and the pressure bearing capacity of the one-way pressure relief device 918 are both less than the pressure bearing capacity of the wrapping structure 1.

[0226] The relative size of the pressure bearing capacity can be measured by filling gas into the package structure 1. Specifically, since the one-way pressure relief device 918 is covered on the pressure relief port 12, the package structure 1 and the one-way pressure relief device 918 substantially seal the first accommodation space 11. When gas is filled into the first accommodation space 11, the air pressure in the first accommodation space 11 continuously increases, and the gas pressure borne by the package structure 1 and the one-way pressure relief device 918 continuously increases. In the process of gas continuously filling the first accommodation space 11, the one-way pressure relief device 918 undergoes significant deformation or damage before the package structure 1, or the one-way pressure relief device 918 moves away from the pressure relief port 12 under the action of the air pressure in the first accommodation space 11, so that the pressure relief port 12 is in an open state. That is, the pressure bearing capacity of the one-way pressure relief device 918 is less than that of the package structure 1, and the pressure bearing capacity of the package structure 1 is greater than that of the one-way pressure relief device 918.

[0227] For example, the one-way pressure relief device 918 within the pressure relief cover 923 may be spaced apart from or abut the wrapping structure 1, and may not be connected to the wrapping structure 1. The one-way pressure relief device 918 is maintained at the pressure relief port 12 by the pressure relief cover 923 covering the pressure relief port 12. In the event of thermal runaway of the battery cells 3 within the first accommodating space 11, the one-way pressure relief device 918, which is not connected to the wrapping structure 1, is moved away from the pressure relief port 12 under the pressure of the thermal runaway ejecta within the first accommodating space 11, causing the pressure relief port 12 to open.

[0228] The relative size of the pressure bearing capacity can be measured by filling gas into the package structure 1. Specifically, since the pressure relief cover 923 covers the pressure relief port 12, the package structure 1 and the pressure relief cover 923 roughly seal the first accommodation space 11. When gas is filled into the first accommodation space 11, the air pressure in the first accommodation space 11 continues to increase, and the gas pressure borne by the package structure 1 and the pressure relief cover 923 continues to increase. In the process of gas continuously filling the first accommodation space 11, the pressure relief cover 923 undergoes significant deformation or damage before the package structure 1, causing the pressure relief port 12 to be in an open state. That is, the pressure bearing capacity of the pressure relief cover 923 is less than that of the package structure 1, and the pressure bearing capacity of the package structure 1 is greater than that of the one-way pressure relief device 918.

[0229] For example, the one-way pressure relief device 918 located in the pressure relief cover 923 can be connected to the packaging structure 1.

[0230] For example, the one-way pressure relief device 918 located in the pressure relief cover 923 may be connected to the housing 13 .

[0231] In the disclosed embodiment, a pressure relief cover 923 disposed over the pressure relief port 12 covers the one-way pressure relief device 918, and the pressure relief cover 923 is sealedly connected to the package structure 1. This can, to a certain extent, suppress the possibility of thermal runaway ejection materials from the package structure 1 entering the first accommodating space 11 from the pressure relief port 12 through the gap between the one-way pressure relief device 918 and the package structure 1, thereby facilitating the suppression of the spread of thermal runaway. Because the pressure bearing capacity of the pressure relief cover 923 is less than that of the package structure 1, thermal runaway ejection materials within the first accommodating space 11 can be effectively decompressed through the pressure relief port 12 and the pressure relief cover 923.

[0232] It is understood that the specific structure of the pressure relief assembly 917 is not limited. For example, the one-way pressure relief device 918 is connected to the packaging structure 1, and the pressure relief assembly 917 may not be provided with the pressure relief cover 923.

[0233] In one embodiment, the pressure relief cover 923 is made of mica.

[0234] Exemplarily, the pressure relief cover 923 is made of mica paper.

[0235] In the disclosed embodiment, the mica pressure relief cover 923 can be well adhered to the package structure 1, facilitating a good seal between the pressure relief cover 923 and the package structure 1. The mica material used to form the pressure relief cover 923 has certain flame retardant properties and can withstand high temperatures. This can effectively maintain a seal at the pressure relief port 12, thereby preventing the possibility of external thermal runaway ejecta from entering the first accommodation space 11.

[0236] In one embodiment, the pressure relief component 917 is an insulating film, and the melting point of the insulating film is less than or equal to 500°C.

[0237] Illustratively, the melting point of the insulating film may be 500°C, 400°C, 350°C, 300°C, 260°C, or 200°C.

[0238] In the disclosed embodiment, during normal operation of the battery 100, the insulating film at the pressure relief vent 12 serves to shield external debris such as dust. Because the insulating film has a melting point of 500°C or less, if thermal runaway of the battery cells 3 within the packaging structure 1 of the battery 100 occurs, the insulating film can be melted through by the thermal runaway ejecta within the first accommodating space 11, facilitating rapid pressure relief within the first accommodating space 11.

[0239] It is understood that the specific melting point of the insulating film is not limited. For example, the melting point of the insulating film may be less than 500°C.

[0240] In one embodiment, referring to Figures 26 and 27, as well as Figures 30 to 32, the pressure relief assembly 917 has a weakened portion 921, which is used to enable the pressure relief assembly 917 to open the pressure relief port 12 under the action of the air pressure in the first accommodating space 11 to relieve the pressure in the first accommodating space 11.

[0241] The weakened portion 921 is a thinner portion of the pressure relief assembly 917 .

[0242] Exemplarily, the weakened portion 921 is a recessed portion on the pressure relief assembly 917 .

[0243] For example, a weakened portion 921 may be provided on the insulating film as appropriate.

[0244] In the embodiment of the present disclosure, the strength of the pressure relief component 917 is weakened by the weakening portion 921, so that the pressure relief component 917 can be more easily deformed away from the pressure relief port 12 under the action of the thermal runaway ejecta in the first accommodating space 11 to open the pressure relief port 12, thereby allowing the thermal runaway ejecta in the first accommodating space 11 to be better decompressed.

[0245] In one embodiment, referring to FIG. 26 and FIG. 27 , the weakened portion 921 is a weakened hole, and the pressure relief assembly 917 has at least one row of weakened holes, with each row having at least two weakened holes.

[0246] For example, the number of weakened holes in each row may be two, three, ten or twenty.

[0247] Illustratively, the weakened hole may be a blind hole or a through hole.

[0248] Each row of at least two weakened apertures forms a structure generally similar to a broken line.

[0249] In the embodiment of the present disclosure, there are at least two weakened holes in each row, so that the strength of the pressure relief assembly 917 is weakened along the rows of weakened holes, which is conducive to the thermal runaway ejecta in the first accommodating space 11 breaking through the weakened portion 921 of the pressure relief assembly 917 to achieve pressure relief in the first accommodating space 11.

[0250] In one embodiment, referring to FIG. 28 to FIG. 32 , the weakened portion 921 is a notch.

[0251] The notch is also the thinner portion of the pressure relief assembly 917 .

[0252] For example, the scratches may be marks made on the pressure relief component 917 by a relatively sharp object.

[0253] Exemplarily, the pressure relief component 917 is a metal plate connected to the packaging structure 1 , and notches are formed on the metal plate.

[0254] For example, referring to Figures 30 to 32, the notch is in the shape of a ring.

[0255] In the disclosed embodiment, the pressure relief assembly 917 is weakened by a notch serving as a weakened portion 921, enabling the pressure relief assembly 917 to open the pressure relief port 12 and release pressure under the action of thermal runaway ejecta within the first accommodating space 11. The weakened portion 921 is a notch, which facilitates the convenient processing of the weakened portion 921 on the pressure relief assembly 917.

[0256] In one embodiment, the battery cell 3 is a soft-pack battery cell 3 .

[0257] In one embodiment, referring to FIG. 1 to FIG. 3 and FIG. 18 to FIG. 20 , the pressure relief component 917 is a flame retardant cover 4 .

[0258] In one embodiment, referring to Figures 23, 24, and 29, the conductive terminal 2 includes a sampling electrode 22 and at least two transition electrodes 21. One transition electrode 21 is electrically connected to the tab 31 of one battery cell 3, and the other transition electrode 21 is electrically connected to the tab 31 of another battery cell 3. The tabs 31 corresponding to the two transition electrodes 21 have opposite polarities. The sampling electrodes 22 are electrically connected to the tabs 31 of the two corresponding battery cells 3, respectively, and the tabs 31 of the two battery cells 3 electrically connected to the sampling electrodes 22 have opposite polarities. The sampling electrodes 22 are electrically connected to the tabs 31 of the two corresponding battery cells 3, respectively, and the tabs 31 of the two battery cells 3 electrically connected to the sampling electrodes 22 have opposite polarities. Each sampling electrode 22 is electrically connected to the positive tab 31 of one battery cell 3 and the negative tab 31 of another battery cell 3, respectively. The battery cells 3 of the battery 100 are connected in series through the sampling electrodes 22.

[0259] In one embodiment, referring to Figures 23 to 32 , a battery 100 includes a wrapping structure 1, a conductive terminal 2, and a battery cell 3. The wrapping structure 1 forms a first storage space 11. A pressure relief vent 12 connected to the first storage space 11 is formed on one side of the wrapping structure 1. The rest of the wrapping structure 1 is a sealed structure. The conductive terminal 2 is connected to the wrapping structure 1, and the conductive terminal 2 and the pressure relief vent 12 are located on different sides of the wrapping structure 1. The battery cell 3 is located within the first storage space 11, and the tab 31 of the battery cell 3 is electrically connected to the conductive terminal 2. The battery 100 also includes a pressure relief assembly 917 connected to the wrapping structure 1. The pressure relief assembly 917 is disposed over the pressure relief vent 12 to shield the pressure relief vent 12. The pressure relief assembly 917 is configured to open the pressure relief vent 12 in response to air pressure within the first storage space 11, thereby relieving pressure from the first storage space 11. The wrapping structure 1 includes a shell 13 and a top cover 14. The pressure relief vent 12 is formed on one side of the shell 13. The top cover 14 is mounted on the housing 13. The top cover 14 and the housing 13 enclose a first accommodating space 11. The conductive terminal 2 is mounted on the top cover 14. At least two batteries 100 are mounted in the battery pack casing, with a thermal insulation pad disposed between two adjacent batteries 100. The tabs 31 of the battery cells 3 are connected to the conductive terminals 2 mounted on the top cover 14. After the tabs 31 of the battery cells 3 are welded to the conductive terminals 2 mounted on the top cover 14, the battery cells 3, the top cover 14, and the conductive terminals 2 are integrally mounted to the housing 13 so that the battery cells 3 are located within the housing 13. A slot is provided on the top cover 14. One end of the housing 13 is inserted into the slot and sealed with glue. The pressure relief vent 12 is arranged opposite the top cover 14. The pressure relief vent 12 is located at one end of the housing 13, and the top cover 14 is located at the other end of the housing 13. The top cover 14 is bonded to the housing 13. There are at least two conductive terminals 2 on the top cover 14, one of which is electrically connected to the positive tab 31 of one of the battery cells 3, and one of which is electrically connected to the negative tab 31 of the other battery cell 3. One of the U-shaped conductive terminals 2 is electrically connected to the negative tab 31 of one of the battery cells 3 and the positive tab 31 of the other battery cell 3, so that the two battery cells 3 are connected in series. The conductive terminal 2 connected to the positive tab 31 of one of the battery cells 3 and the conductive terminal 2 connected to the negative tab 31 of the other battery cell 3 are arranged at intervals.

[0260] For example, referring to Figures 23 to 27 , the pressure relief assembly 917 includes a one-way pressure relief device 918 , which covers the pressure relief port 12 to block the pressure relief port 12. The one-way pressure relief device 918 is configured to open the pressure relief port 12 under the action of the air pressure within the first accommodation space 11 to relieve pressure in the first accommodation space 11. The one-way pressure relief device 918 is also configured to press toward the pressure relief port 12 under the action of a force on the side of the one-way pressure relief device 918 facing away from the pressure relief port 12 to maintain the pressure relief port 12 blocked. The one-way pressure relief device 918 includes a baffle 919 and a mounting plate 920 . The baffle 919 covers the pressure relief port 12. The mounting plate 920 is connected to the baffle 919 and the side wall of the wrapping structure 1 respectively. The mounting plate 920 is located on one side of the baffle 919 along the target direction. The mounting plate 920 and the baffle 919 are arranged crosswise. The side of the baffle 919 facing away from the mounting plate 920 along the target direction is used to deform under the action of external force to move closer to or away from the pressure relief port 12. The mounting plate 920 and the baffle 919 are integrally formed. The mounting plate 920 is glued to the wrapping structure 1. The material of the one-way pressure relief device 918 is metal titanium or titanium alloy. The material of the mounting plate 920 and the material of the baffle 919 are both metal titanium or titanium alloy. The one-way pressure relief device 918 is connected to the shell 13. The mounting plate 920 is bonded to the large surface of the shell 13, where the large surface of the shell 13 refers to the surface with the largest area on the shell 13. The one-way pressure relief device 918 is L-shaped. The battery cell 3 in the first accommodation space 11 of a battery 100 in the battery pack has thermal runaway. The thermal runaway ejection material in the corresponding first accommodation space 11 acts on the L-shaped one-way pressure relief device 918, causing the L-shaped one-way pressure relief device 918 to open the pressure relief port 12 to relieve the pressure in the first accommodation space 11. The thermal runaway ejection material in the first accommodation space 11 is ejected through the pressure relief port 12 and rebounds through the battery pack box to the L-shaped one-way pressure relief device 918 of the adjacent battery 100. The L-shaped one-way pressure relief device 918 The pressure relief device 918 is pressed toward the pressure relief port 12 and pressed against the wrapping structure 1 by the rebounded thermal runaway ejecta on the side facing away from the pressure relief port 12, so that the L-shaped one-way pressure relief device 918 of the adjacent battery 100 keeps blocking the pressure relief port 12, thereby reducing the possibility of the rebounded thermal runaway ejecta entering the first accommodation space 11 of the adjacent battery 100 and causing the battery cell 3 in the first accommodation space 11 of the adjacent battery 100 to experience thermal runaway, thereby suppressing the spread of thermal runaway within the battery pack. The pressure relief assembly 917 also includes a pressure relief cover 923, which is provided over the pressure relief port 12. The pressure relief cover 923 is sealed to the wrapping structure 1, and the one-way pressure relief device 918 is located within the pressure relief cover 923. The pressure bearing capacity of the pressure relief cover 923 and the one-way pressure relief device 918 are both less than the pressure bearing capacity of the wrapping structure 1. The pressure relief cover 923 is made of mica.

[0261] For example, referring to FIG. 28 to FIG. 32 , the pressure relief component 917 is an insulating film, and the melting point of the insulating film is less than or equal to 500° C.

[0262] For example, referring to FIG. 28 to FIG. 32 , the pressure relief component 917 has a weakened portion 921 , which is used to enable the pressure relief component 917 to open the pressure relief port 12 under the action of the air pressure in the first accommodation space 11 to relieve pressure in the first accommodation space 11 .

[0263] For example, the weakened portion 921 may be formed in the insulating film.

[0264] For example, the weakened portion 921 may be formed on the pressure relief component 917 made of a metal material.

[0265] The weakened portion 921 is a weakened hole, and the pressure relief assembly 917 has at least one row of weakened holes, with each row having at least two weakened holes. The at least two weakened holes in each row form a substantially broken line structure.

[0266] For example, referring to FIG. 28 to FIG. 32 , the weakened portion 921 is a notch.

[0267] Second embodiment:

[0268] Referring to Figures 1 to 3 , the battery 100 of the embodiment of the present disclosure includes a wrapping structure 1, a conductive terminal 2, and a battery cell 3. The wrapping structure 1 forms a first accommodating space 11, and a pressure relief vent 12 connected to the first accommodating space 11 is formed on one side of the wrapping structure 1. The rest of the wrapping structure 1 is a sealed structure. The conductive terminal 2 is connected to the wrapping structure 1, and the conductive terminal 2 and the pressure relief vent 12 are located on different sides of the wrapping structure 1. The battery cell 3 is located in the first accommodating space 11, and the tab 31 of the battery cell 3 is electrically connected to the conductive terminal 2.

[0269] The wrapping structure 1 is a structure wrapped around the battery cell 3 , and the first accommodation space 11 of the wrapping structure 1 is mainly used to accommodate the battery cell 3 .

[0270] The conductive terminal 2 is electrically connected to the tab 31 of the battery cell 3 . The battery cell 3 is powered externally through the conductive terminal 2 , or an external power source is powered externally through the conductive terminal 2 .

[0271] For example, the conductive terminal 2 is a tab, and the multiple batteries 100 in the battery pack are connected in series, in parallel, or in mixed series via the tab.

[0272] Exemplarily, the battery cell 3 includes a bare cell and an outer packaging wrapped around the bare cell for protecting the bare cell. The bare cell includes a positive electrode sheet, a negative electrode sheet, and a separator located between the positive electrode sheet and the negative electrode sheet.

[0273] A pressure relief vent 12 connected to the first accommodating space 11 is formed on one side of the wrapping structure 1. The rest of the wrapping structure 1 is a sealed structure, meaning that the portion of the wrapping structure 1 covering the battery cell 3, except for the pressure relief vent 12, is substantially sealed. In other words, the portion of the wrapping structure 1 covering the battery cell 3, except for the pressure relief vent 12, can be completely sealed or partially sealed. In the event that the portion of the wrapping structure 1 covering the battery cell 3, except for the pressure relief vent 12, is not completely sealed, as long as the gap at the incompletely sealed portion of the wrapping structure 1 can suppress the eruption of thermal runaway gases from the incompletely sealed portion of the wrapping structure 1 to a certain extent, thereby guiding the thermal runaway gases to erupt from the pressure relief vent 12.

[0274] The conductive terminal 2 and the pressure relief vent 12 are located on different sides of the package structure 1 , and the thermal runaway gas ejected from the pressure relief vent 12 can be as far away from the conductive terminal 2 as possible.

[0275] For example, the number of battery cells 3 in the packaging structure 1 may be one or at least two.

[0276] In the disclosed embodiment, if thermal runaway occurs in a battery cell 3 within the packaging structure 1 of the battery 100, due to the pressure relief vent 12 formed on one side of the packaging structure 1, which is connected to the first accommodation space 11, the generated thermal runaway gas faces significant resistance to escape from other portions of the packaging structure 1 except the pressure relief vent 12. This makes it difficult for the thermal runaway gas to escape from the packaging structure 1 except for the pressure relief vent 12. The packaging structure 1 guides the thermal runaway gas to eject from the packaging structure 1 through the pressure relief vent 12, thereby relieving the pressure in the first accommodation space 11 within the packaging structure 1 and achieving a directional eruption of the thermal runaway gas. Because the conductive terminal 2 and the pressure relief vent 12 are located on different sides of the packaging structure 1, the thermal runaway gas ejected from the pressure relief vent 12 and the substances carried by the thermal runaway gas can be kept as far away from the conductive terminal 2 as possible.

[0277] In one embodiment, the battery cell 3 is a soft-pack battery cell.

[0278] The outer packaging of the bare cell of the soft-pack battery cell, which is used to protect the bare cell, is a plastic film.

[0279] Exemplarily, the plastic film is an aluminum-plastic film.

[0280] In the disclosed embodiment, when thermal runaway occurs in the battery cell 3 , the thermal runaway gas generated by the bare cell breaks through the plastic film and sprays in all directions. The thermal runaway gas is ejected directionally from the pressure relief port 12 under the guidance of the wrapping structure 1 .

[0281] It is understandable that the battery cell 3 is not limited to a soft-pack battery cell. For example, the battery cell 3 may be a hard-shell battery cell 3, wherein the bare cell of the hard-shell battery cell 3 is covered with an outer metal shell or plastic shell.

[0282] In one embodiment, referring to FIG. 10 , the number of batteries 100 in the battery pack box is at least two, and the at least two batteries 100 are arranged sequentially. The conductive terminals 2 of the at least two batteries 100 arranged sequentially are oriented in the same direction, and the conductive terminals 2 of the at least two batteries 100 arranged sequentially are oriented crosswise to the direction in which the at least two batteries 100 are arranged sequentially.

[0283] The orientation of the conductive terminal 2 of the battery 100 refers to the direction of the side of the packaging structure 1 of the battery 100 facing the conductive terminal 2 .

[0284] For example, referring to FIG. 10 , in at least two batteries 100 arranged sequentially, the conductive terminals 2 are oriented perpendicular to the direction in which the at least two batteries 100 are arranged sequentially.

[0285] In the embodiment of the present disclosure, since the conductive terminal 2 and the pressure relief vent 12 are located on different sides of the wrapping structure 1, and the conductive terminals 2 of at least two batteries 100 arranged in sequence are oriented in the same direction, the orientation of the conductive terminals 2 in the at least two batteries 100 arranged in sequence is arranged crosswise with the direction in which the at least two batteries 100 are arranged in sequence, so that the pressure relief vents 12 of the at least two batteries 100 arranged in sequence can avoid the conductive terminals 2 of the at least two batteries 100 arranged in sequence, thereby reducing the possibility that the thermal runaway gas ejected from the pressure relief vent 12 of any battery 100 in the at least two batteries 100 arranged in sequence will short-circuit the conductive terminal 2 of the adjacent battery 100, thereby facilitating the thermal runaway of the battery 100 from spreading to the adjacent battery.

[0286] In one embodiment, referring to Figures 2 and 3, the number of battery cells 3 in the battery 100 is at least two, and the conductive terminal 2 includes a sampling electrode 22 and at least two transfer electrodes 21, wherein one transfer electrode 21 is electrically connected to the tab 31 of one battery cell 3, and the other transfer electrode 21 is electrically connected to the tab 31 of the other battery cell 3, and the polarities of the tabs 31 corresponding to the two transfer electrodes 21 are opposite. The sampling electrode 22 is electrically connected to the tabs 31 of the two corresponding battery cells 3, respectively, and the polarities of the tabs 31 of the two corresponding battery cells 3 electrically connected to the sampling electrode 22 are opposite.

[0287] The tabs 31 corresponding to at least two of the adapter electrodes 21 have opposite polarities, with one adapter electrode 21 having a positive polarity and the other having a negative polarity. The battery cells 3 of the battery 100 can be powered externally via the adapter electrodes 21 and can be charged via the adapter electrodes 21.

[0288] The sampling electrodes 22 are electrically connected to the tabs 31 of the two corresponding battery cells 3, respectively. The polarity of the tabs 31 of the two corresponding battery cells 3 electrically connected to the sampling electrodes 22 is opposite. Each sampling electrode 22 is electrically connected to the positive tab 31 of one battery cell 3 and the negative tab 31 of another battery cell 3, respectively. The battery cells 3 of the battery 100 are connected in series through the sampling electrodes 22.

[0289] Exemplarily, referring to FIG. 2 and FIG. 3 , the switching electrode 21 and the sampling electrode 22 are both bars.

[0290] In the disclosed embodiment, the battery cells 3 of the battery 100 are connected in series via the sampling electrode 22, and the battery cells 3 of the battery 100 are powered or charged via the adapter electrode 21. The sampling electrode 22 connects the battery cells 3 of the battery 100 in series, and the potential of the sampling electrode 22 is the potential between the two battery cells 3 connected in series. By measuring and sampling the voltage between the sampling electrode 22 and the corresponding adapter electrode 21, the operating status of the corresponding battery cell 3 can be identified. Because the conductive terminal 2 and the pressure relief vent 12 are located on different sides of the package structure 1, the thermal runaway gas ejected from the pressure relief vent 12 can avoid the adapter electrode 21 and the sampling electrode 22 as much as possible.

[0291] In one embodiment, referring to FIG. 1 to FIG. 3 , the battery 100 further includes a pressure relief component 917 covering the pressure relief port 12 , and the pressure relief component 917 is a flame retardant cover 4 .

[0292] In one embodiment, referring to FIG. 1 to FIG. 3 , the battery 100 further includes a flame-retardant cover 4 covering the pressure relief port 12 , and the pressure bearing capacity of the wrapping structure 1 is greater than that of the flame-retardant cover 4 .

[0293] Pressure bearing capacity refers to the ability to withstand fluid pressure.

[0294] The relative size of the pressure bearing capacity can be measured by filling the package structure 1 with gas. Specifically, because the flame-retardant cover 4 covers the pressure relief port 12, the package structure 1 and the flame-retardant cover 4 substantially seal the first storage space 11. When gas is filled into the first storage space 11, the air pressure in the first storage space 11 continuously increases, and the gas pressure borne by the package structure 1 and the flame-retardant cover 4 continuously increases. As gas is continuously filled into the first storage space 11, the flame-retardant cover 4 breaks before the package structure 1, indicating that the pressure bearing capacity of the flame-retardant cover 4 is less than that of the package structure 1, and the bearing capacity of the package structure 1 is greater than that of the flame-retardant cover 4.

[0295] The flame-retardant cover 4 has a certain flame-retardant capability. In the event of thermal runaway of the battery 100 , the flame-retardant cover 4 may be deformed due to the high temperature, but will basically not be ignited.

[0296] In the embodiment of the present disclosure, the flame retardant cover 4 is provided on the pressure relief vent 12. The flame retardant cover 4 has a certain flame retardant ability, which can reduce the possibility of the flame retardant cover 4 being ignited to a certain extent when the battery 100 experiences thermal runaway. The flame retardant cover 4 is provided on the pressure relief vent 12. When the adjacent battery 100 experiences thermal runaway, it can reduce the thermal runaway gas generated by the adjacent battery 100 from entering the first storage space 11 through the pressure relief vent 12, which is beneficial to suppress the spread of thermal runaway to a certain extent. When the battery cell 3 in the first storage space 11 experiences thermal runaway, since the bearing capacity of the wrapping structure 1 is greater than the bearing capacity of the flame retardant cover 4, the thermal runaway gas in the first storage space 11 first breaks through the flame retardant cover 4, causing the thermal runaway gas in the first storage space 11 to erupt directionally from the pressure relief vent 12.

[0297] In one embodiment, referring to FIG. 1 to FIG. 3 , the flame retardant cover 4 may be made of mica.

[0298] Exemplarily, the flame retardant cover 4 is mica paper.

[0299] Exemplarily, the mica paper is bonded to the wrapping structure 1 .

[0300] In the embodiment of the present disclosure, the flame retardant cover 4 is made of mica, which has a certain flame retardancy and will not be ignited in the event of thermal runaway of the battery 100. The thinner the flame retardant cover 4 made of mica, the smaller the pressure bearing capacity.

[0301] In one embodiment, referring to FIG. 1 , the flame retardant cover 4 may be formed with notches 41 .

[0302] For example, referring to FIG. 1 , FIG. 3 and FIG. 4 , the notch 41 is located in the area corresponding to the pressure relief port 12 .

[0303] In the embodiment of the present disclosure, by processing the notch 41 on the flame retardant cover 4, the pressure bearing capacity of the flame retardant cover 4 can be reduced. In the event that thermal runaway occurs in the battery cell 3 in the first storage space 11 of the wrapping structure 1, the thermal runaway gas in the first storage space 11 is facilitated to break through the flame retardant cover 4 and eject from the pressure relief port 12.

[0304] In one embodiment, referring to FIG. 1 , the flame retardant cover 4 is formed with a through hole 42 communicating with the first accommodating space 11 .

[0305] The through hole 42 on the flame retardant cover 4 passes through the flame retardant cover 4 .

[0306] In the embodiment of the present disclosure, part of the structure within the first accommodating space 11 of the wrapping structure 1 needs to extend out of the first accommodating space 11. This part of the structure extends out of the first accommodating space 11 from the through hole 42 of the flame retardant cover 4. The position where the flame retardant cover 4 is provided is the pressure relief port 12 for pressure relief. Even if part of the structure of the first accommodating space 11 extends out from the through hole 42, the through hole 42 does not need to be sealed, which is conducive to simplifying the structure of the battery 100.

[0307] In one embodiment, referring to Figures 3, 7 and 8, the battery 100 further includes a temperature-regulating container 5 partially located within the first accommodation space 11, and a battery cell 3 is provided on one side or two opposite sides of the temperature-regulating container 5. The temperature-regulating container 5 has a temperature-regulating cavity 51 and an inlet 52 and an outlet 53 respectively connected to the temperature-regulating cavity 51. The temperature-regulating container 5 is penetrated by the through hole 42 so that the inlet 52 and the outlet 53 are both exposed outside the first accommodation space 11 along the side of the wrapping structure 1 toward the flame-retardant cover 4.

[0308] The battery cells 3 generate heat during operation, and even in the event of thermal runaway, they generate significant heat. Fluid enters the temperature control chamber 51 of the temperature control container 5 through the inlet 52 and flows out of the temperature control chamber 51 through the outlet 53. The flow of fluid into and out of the temperature control chamber 51 regulates the temperature of the battery cells 3.

[0309] Exemplarily, the fluid flowing through the temperature regulating chamber 51 of the temperature regulating container 5 may be liquid or gas.

[0310] Exemplarily, liquid or gas with a relatively low temperature is introduced into the temperature regulating chamber 51 to cool the battery cells 3 .

[0311] Exemplarily, the temperature control container 5 may be an air bag.

[0312] For example, the material of the airbag may be rubber.

[0313] For example, referring to FIG. 3 and FIG. 7 , battery cells 3 are disposed on opposite sides of the temperature regulating container 5 .

[0314] For example, referring to FIG. 3 , the number of battery cells 3 on each side is two, and the two battery cells 3 on each side are connected in series via the sampling electrode 22 .

[0315] For example, referring to FIG. 7 , the number of battery cells 3 on each side is one.

[0316] Exemplarily, the number of battery cells 3 on each side is one, and the two battery cells 3 located on both sides of the temperature control container 5 are connected in series through the sampling electrode 22 .

[0317] In the disclosed embodiment, the inlet 52 and outlet 53 of the temperature-regulating container 5 extend outside the first accommodation space 11 through the through-hole 42 of the flame-retardant cover 4. This facilitates connecting the temperature-regulating container 5 to an external fluid source via the inlet 52 and outlet 53, allowing external fluid to enter the temperature-regulating container 5 through the inlet 52 and exit through the outlet 53, thereby regulating the temperature of the battery cells 3. Since the inlet 52 and outlet 53 of the temperature-regulating container 5 extend outside the first accommodation space 11 through the through-hole 42 of the flame-retardant cover 4, the through-hole 42 does not need to be sealed, which helps simplify the structure of the battery 100.

[0318] It is understandable that what extends out of the through hole 42 of the flame retardant cover 4 into the first accommodating space 11 of the packaging structure 1 is not necessarily the temperature regulating container 5 , but may also be other structures partially located in the first accommodating space 11 of the packaging structure 1 depending on the situation.

[0319] In one embodiment, referring to FIG8 , the temperature control container 5 includes a container body 54, a first guide plate 55, and a second guide plate 56. The temperature control chamber 51, the inlet 52, and the outlet 53 are all formed in the container body 54. The end of the container body 54 facing the pressure relief port 12 is the target end, and the outlet 53 and the inlet 52 are both located at the target end of the container body 54. The first guide plate 55 is located in the temperature control chamber 51. The first guide plate 55 is connected to the cavity wall of the temperature control chamber 51 facing the target end. The first guide plate 55 is spaced apart from the cavity wall of the temperature control chamber 51 facing away from the target end. There are multiple first guide plates 55, and multiple first guide plates 55 are located between the outlet 53 and the inlet 52. The second guide plate 56 is located in the temperature regulating chamber 51. The second guide plate 56 is spaced apart from the cavity wall of the temperature regulating chamber 51 toward the target end. The second guide plate 56 is connected to the cavity wall of the temperature regulating chamber 51 away from the target end. The second guide plate 56 is located between the first guide plate 55 closest to the outlet 53 and the first guide plate 55 closest to the inlet 52.

[0320] The container body 54 is mainly used to accommodate a fluid whose temperature can be adjusted.

[0321] The first guide plate 55 and the second guide plate 56 are used to guide the fluid to flow in the temperature adjustment chamber 51 .

[0322] In the embodiment of the present disclosure, since the first guide plate 55 is connected to the cavity wall of the cooling cavity toward the target end, the first guide plate 55 is spaced apart from the cavity wall of the cooling cavity away from the target end, and the second guide plate 56 is spaced apart from the cavity wall of the cooling cavity toward the target end, the second guide plate 56 is connected to the cavity wall of the cooling cavity away from the target end, and the second guide plate 56 is located between the first guide plate 55 closest to the outlet 53 and the first guide plate 55 closest to the inlet 52, so that the first guide plate 55 and the second guide plate 56 are distributed in a staggered state in the first accommodating space 11. The fluid entering the temperature control cavity 51 from the inlet 52 flows through a longer path under the guidance of the first guide plate 55 and the second guide plate 56 and then flows out from the outlet 53, which is conducive to sufficient temperature control of the fluid in the temperature control cavity 51.

[0323] It is understandable that the first guide plate 55 and the second guide plate 56 may not be provided in the temperature adjustment chamber 51 depending on the situation.

[0324] In one embodiment, the ignition point of the flame retardant cover 4 and the ignition point of the wrapping structure 1 are both greater than or equal to 800°C.

[0325] For example, the ignition point of the flame retardant cover 4 may be 800° C., 810° C., 860° C., or 900° C., etc.

[0326] For example, the ignition point of the flame retardant cover 4 can be measured by heating the flame retardant cover 4 to a state where the flame retardant cover just burns.

[0327] For example, the ignition point of the package structure 1 can be measured by heating the package structure 1 to a state where the package structure just burns.

[0328] In the embodiment of the present disclosure, the ignition points of the flame retardant cover 4 and the wrapping structure 1 are relatively high, and even under the influence of thermal runaway gas at a relatively high temperature, the flame retardant cover 4 and the wrapping structure 1 will basically not be ignited.

[0329] In one embodiment, referring to Figures 1 to 3 and Figure 9 , the package structure 1 includes a housing 13 and a top cover 14 . A pressure relief vent 12 is formed on one side of the housing 13 . The top cover 14 and the housing 13 enclose a first receiving space 11 , and the conductive terminal 2 is mounted on the top cover 14 .

[0330] Exemplarily, the mica paper is bonded to the housing 13 .

[0331] In the embodiment of the present disclosure, before the top cover 14 is installed on the shell 13, the conductive terminal 2 on the top cover 14 can be electrically connected to the tab 31 of the battery cell 3, and then the connected top cover 14, conductive terminal 2 and battery cell 3 can be installed to the shell 13, so as to facilitate the connection of the conductive terminal 2 and the battery cell 3 before entering the shell.

[0332] It is understandable that the package structure 1 is not limited to the structure in which the top cover 14 is installed on the shell 13. For example, the package structure 1 can be an integrally formed structure.

[0333] In one embodiment, referring to FIG. 1 to FIG. 3 and FIG. 9 , the top cover 14 has a flange 141 covering the side wall of the housing 13 , and a gap between the flange 141 and the side wall of the housing 13 is less than or equal to 0.5 mm.

[0334] Exemplarily, the gap between the flange 141 and the side wall of the housing 13 may be 0.5 mm, 0.4 mm, 0.3 mm, 0.2 mm or 0.1 mm.

[0335] For example, before the top cover 14 is installed into the shell 13 but before the top cover 14 is connected to the shell 13 , the dimension between the flange 141 and the side wall of the shell 13 can be measured by a feeler gauge, a vernier caliper, or a micrometer.

[0336] For example, the span of the flange 141 of the top cover 14 and the corresponding span of the shell 13 can be measured separately by a vernier caliper or a micrometer, and half of the difference between the two is the gap between the top cover 14 and the shell 13.

[0337] For example, referring to FIG. 9 , the gap between the flange 141 and the side wall of the housing 13 is D1 , and D1 ≤ 0.5 mm.

[0338] In the embodiment of the present disclosure, the flange 141 is not completely sealed from the side wall of the shell 13, and the gap between the flange 141 and the side wall of the shell 13 is relatively appropriate, so that the resistance to the escape of thermal runaway gas from between the flange 141 and the side wall of the shell 13 is relatively large, which can better suppress the thermal runaway gas from erupting toward the top cover 14, thereby better guiding the thermal runaway gas in the first accommodating space 11 to erupt from the pressure relief port 12, which is beneficial to reducing the degree of thermal runaway of the battery 100.

[0339] In one embodiment, please refer to Figures 4 and 5, the shell 13 includes a plurality of bent plates 131 bent in sequence, and the bent plates 131 at both ends of the circumference of the battery cell 3 are connected. The plurality of bent plates 131 are arranged to form a pressure relief port 12, and the top cover 14 and the pressure relief port 12 are respectively located on opposite sides of the shell 13. The top cover 14 and the plurality of bent plates 131 are arranged to form a first accommodating space 11. The wrapping structure 1 also includes a first insulating layer 15, which covers the inner surface of the shell 13.

[0340] The housing 13 includes a plurality of bent plates 131. The housing 13 is formed by bending a whole plate multiple times and then connecting the bent plates 131 at both ends. The housing 13 is in an unfolded state before being bent.

[0341] Exemplarily, the first insulating layer 15 is covered on the housing 13 by heat pressing.

[0342] Exemplarily, the first insulating layer 15 is coated on the housing 13 .

[0343] In the disclosed embodiment, the housing 13 is generally flat in the unfolded state. The first insulating layer 15 can be first placed over the unfolded housing 13, and then the housing 13 and the first insulating layer 15 can be bent together. After the housing 13 is bent and formed, the first insulating layer 15 already covers the inner surface of the housing 13. Covering the first insulating layer 15 over the housing 13 in the unfolded state allows the first insulating layer 15 to be more conveniently installed on the housing 13.

[0344] In one embodiment, referring to Figures 4 and 5, the shell 13 is made of metal, and the battery 100 further includes a reinforcing plate 6, which is located on the inner surface of the shell 13. The bent plates 131 at both ends of the battery cell 3 are connected by welding. The welding positions of the bent plates 131 at both ends of the battery cell 3 are target positions, and the reinforcing plate 6 is welded to the shell 13 at the target position.

[0345] It should be noted that the reinforcing plate 6 is welded to the housing 13 , and the material of the reinforcing plate 6 is a material that can be welded to the housing 13 .

[0346] Exemplarily, the material of the housing 13 and the material of the reinforcing plate 6 are both metal.

[0347] In the embodiment of the present disclosure, the shell 13 and the reinforcing plate 6 are welded together by welding the reinforcing plate 6 to the shell 13 at the target position. The reinforcing plate 6 supports the shell 13 at the target position, reducing the possibility of the bent plates 131 at both ends of the shell 13 being welded through during the welding process.

[0348] In one embodiment, referring to FIG. 6 , the housing 13 is made of metal, and has a thickness of 0.1 mm to 1 mm.

[0349] For example, referring to FIG. 6 , the thickness of the housing 13 is D2 , and 0.1 mm ≤ D2 ≤ 1 mm.

[0350] Illustratively, the thickness of the housing 13 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, or 1 mm.

[0351] In the embodiment of the present disclosure, the shell 13 is made of metal material, and the thickness of the shell 13 is set to be relatively appropriate, so that the shell 13 is relatively light in weight while having a basically sufficient bearing capacity.

[0352] In one embodiment, referring to FIG. 6 , the housing 13 is made of plastic and is an integrally formed structure. The thickness of the housing 13 is 1 mm to 3 mm.

[0353] For example, referring to FIG. 6 , the thickness of the housing 13 is D2 , 1 mm ≤ D2 ≤ 3 mm.

[0354] Exemplarily, referring to FIG. 6 , the thickness of the housing 13 may be 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.3 mm, 2.6 mm, 2.9 mm, or 3 mm.

[0355] In the embodiment of the present disclosure, the shell 13 is made of a plastic material, and the thickness of the shell 13 is set to be relatively appropriate, so that the shell 13 is relatively light in weight while having a substantially sufficient bearing capacity.

[0356] In one embodiment, referring to FIG. 1 to FIG. 3 , the top cover 14 is made of plastic, and the housing 13 is made of metal or plastic.

[0357] In one embodiment, referring to FIG. 1 to FIG. 3 , the top cover 14 is made of plastic, the shell 13 is made of metal or plastic, and the flame retardant cover 4 is made of mica.

[0358] Exemplarily, the shell 13 may be made of metal such as steel, aluminum, aluminum alloy, copper or copper alloy.

[0359] Illustratively, the aluminum alloy may be an aluminum-magnesium alloy.

[0360] For example, the top cover 14 may be made of engineering plastics such as polypropylene or polyethylene.

[0361] In the embodiment of the present disclosure, the top cover 14 is made of plastic material, so that the top cover 14 has a certain pressure bearing capacity. The shell 13 is made of plastic material or metal material, so that the shell 13 has a certain pressure bearing capacity.

[0362] It is understandable that the material of the flame retardant cover is not limited to mica. For example, the material of the flame retardant cover can be glass fiber.

[0363] In one embodiment, referring to FIG. 1 to FIG. 3 , the conductive terminal 2 and the pressure relief port 12 are respectively located on two opposite sides of the package structure 1 .

[0364] In the disclosed embodiment, because the conductive terminals 2 and the pressure relief vent 12 are located on opposite sides of the package structure 1, the conductive terminals 2 can be positioned as far away from the pressure relief vent 12 as possible. The thermal runaway gas ejected from the pressure relief vent 12 and the substances carried by the thermal runaway gas can be kept away from the conductive terminals 2. Accordingly, in at least two sequentially arranged batteries 100, the pressure relief vents 12 of the at least two sequentially arranged batteries 100 can be positioned as far away from the conductive terminals 2 of the at least two sequentially arranged batteries 100 as possible. This can reduce the possibility of the thermal runaway gas ejected from the pressure relief vents 12 of the at least two sequentially arranged batteries 100 being ejected toward the conductive terminals 2 of an adjacent battery 100, causing a short circuit in the adjacent battery 100, thereby minimizing the possibility of thermal runaway spreading to adjacent batteries 100.

[0365] It is understandable that the arrangement of the conductive terminals 2 and the pressure relief vents 12 is not limited. For example, the wrapping structure 1 is arranged in a direction toward the conductive terminals 2 and in a cross arrangement toward the pressure relief vents 12 .

[0366] The presently disclosed embodiment further provides a battery module, as shown in FIG10 . The battery module includes at least two batteries 100 according to any of the above embodiments, wherein the at least two batteries 100 are arranged in sequence, and the conductive terminals 2 of the at least two batteries 100 arranged in sequence are oriented in the same direction. In the at least two batteries 100 arranged in sequence, the conductive terminals 2 are oriented in a direction that is cross-arranged with the direction in which the at least two batteries 100 are arranged in sequence.

[0367] In the embodiment of the present disclosure, by locating the conductive terminal 2 and the pressure relief vent 12 on different sides of the wrapping structure 1, the conductive terminals 2 facing the same direction, and the conductive terminals 2 facing in a direction that crosses the direction in which the batteries 100 are arranged, the possibility of thermal runaway gas ejected from the pressure relief vent short-circuiting the conductive terminal 2 of an adjacent battery 100 can be reduced, thereby reducing the possibility of thermal runaway spreading to the adjacent battery 100.

[0368] In one embodiment, referring to Figures 1 to 9 , a battery 100 includes a top cover 14, a soft-pack battery cell, a housing 13, and mica paper. The top cover 14 can be used to assemble the housing 13. The housing 13 includes five bent plates 131 that are bent in sequence. The five bent plates 131 of the housing 13 block the first accommodating space 11 in four directions corresponding to the first accommodating space 11. The top cover 14 is mounted on the housing 13 and blocks the first accommodating space 11 in the direction from the first accommodating space 11 toward the top cover 14. In other words, the housing 13 and the top cover 14 block the first accommodating space 11 in five directions. The battery cell 3 is mounted within the housing 13, and the mica paper covers the pressure relief vent 12 of the housing 13. In the event of thermal runaway of the soft-pack battery cell within the housing 13, the generated gas and the substances carried by the gas are ejected from the mica paper at the pressure relief vent 12, thereby achieving directional ejection of the soft-pack battery cell. The first accommodation space 11 sealed by the shell 13, the top cover 14 and the mica paper does not need to be completely sealed, as long as it can guide the directional eruption of the gas generated by thermal runaway. The mica paper is bonded to the shell 13. There is a notch 41 on the mica paper, and the notch 41 is located in the area corresponding to the pressure relief port 12 of the shell 13. The notch 41 can form a blasting point during the occurrence of thermal runaway. A through hole 42 is formed on the mica paper for the structure in the first accommodation space 11 to extend out. The top cover 14 is an injection-molded part, and the conductive terminal 2 is a tab embedded in the top cover 14. Other metal inserts can also be embedded in the top cover 14. The top cover 14 and the shell 13 can be connected in various forms such as bonding, hot pressing or welding. The top cover 14 and the shell 13 do not need to be completely sealed. There can be a gap of less than or equal to 0.5mm between the top cover 14 and the shell 13, or other structures that can suppress the eruption of thermal runaway gases from between the shell 13 and the top cover 14 to a certain extent, so as to suppress the eruption of thermal runaway gases from between the shell 13 and the top cover 14. Soft-pack battery cells are placed in the shell 13. Other structures besides soft-pack battery cells can also be placed in the shell 13. The number of battery cells in the shell 13 is greater than or equal to 1 and less than or equal to 4. The shell 13 is a metal shell 13 with a thickness of 0.1mm to 1mm. The interior of the shell 13 is sprayed with an insulating coating or hot-pressed with a first insulating layer 15.

[0369] For example, please refer to Figures 4 and 5. The shell 13 is formed by bending a plate. The shell 13 includes a plurality of bent plates 131 bent in sequence. The bent plates 131 at both ends of the circumference of the battery cell 3 are connected by welding to splice a continuous annular shell 13. The number of welds in the shell 13 is one weld. A reinforcing plate 6 can be arranged at the weld position to reduce the possibility of the corresponding bent plate 131 being welded through.

[0370] For example, the two parts of the shell 13 may be welded into the annular shell 13 through two welds at different positions.

[0371] For example, the housing 13 may be formed in one piece without welding.

[0372] For example, the bent plates 131 at both ends of the housing 13 along the circumference of the battery cell 3 may be formed by bonding or other methods in addition to welding.

[0373] For example, the housing 13 may be integrally formed of high-temperature resistant plastic, and the thickness of the housing 13 may be 1 mm to 3 mm.

[0374] Third embodiment:

[0375] The battery pack of the embodiment of the present disclosure, please refer to Figures 11 to 17, includes a box body 901 and a battery cell. A second storage space 902 is formed inside the box body 901. The battery cell is located in the second storage space 902. There is at least one battery cell, and each battery cell includes a wrapping structure 1 and at least one battery cell 3. A first storage space 11 is formed inside the wrapping structure 1, and at least one battery cell 3 is arranged in the first storage space 11. At least one side of the wrapping structure 1 is provided with a conductive terminal 2 for electrical connection to other structures, and at least one side of the wrapping structure 1 is provided with a pressure relief port 12 for pressure relief. The conductive terminal 2 and the pressure relief port 12 are located on different sides of the wrapping structure 1.

[0376] The second accommodation space 902 of the box body 901 is used to accommodate the battery unit.

[0377] For example, referring to FIG. 12 , FIG. 13 and FIG. 16 , the number of the second accommodation space 902 may be one.

[0378] For example, the number of the second receiving spaces 902 may be at least two.

[0379] The battery cell 3 is a type of battery cell.

[0380] The battery cell 3 includes a bare cell and a plastic film covering the bare cell for protecting the bare cell.

[0381] Exemplarily, the plastic film is an aluminum-plastic film.

[0382] The bare cell includes a positive electrode sheet, a negative electrode sheet, and a separator located between the positive electrode sheet and the negative electrode sheet.

[0383] The bare cell can be a wound bare cell or a laminated bare cell.

[0384] The first accommodation space 11 is a cavity for accommodating the battery cell 3 .

[0385] It should be explained that the conductive terminal 2 is used for external electrical connection of the battery cell. The battery cell 3 in the battery cell can be powered externally through the conductive terminal 2, and the battery cell 3 of the corresponding battery cell can also be charged through the conductive terminal 2. Therefore, the conductive terminal 2 is electrically connected to the tab 31 of the battery cell 3 in the wrapping structure 1.

[0386] It should be noted that at least one side of the wrapping structure 1 is provided with a conductive terminal 2 for electrical connection to another structure. The "other structure" here refers to a structure external to the corresponding battery cell that is electrically connected to the corresponding battery cell. For example, the battery cells may be connected in series or in parallel via the conductive terminals 2. Of the two battery cells electrically connected via the corresponding conductive terminals 2, the conductive terminal 2 of one battery cell may be the other structure electrically connected to the conductive terminal 2 of the other battery cell.

[0387] At least one side of the wrapping structure 1 is provided with a pressure relief port 12 for pressure relief. The wrapping structure 1 mainly relieves pressure through the pressure relief port 12 , and the gas in the first accommodating space 11 is guided to be discharged from the pressure relief port 12 through the wrapping structure 1 .

[0388] It should be noted that the conductive terminal 2 is part of the battery cell, and each battery cell is provided with a corresponding conductive terminal 2 .

[0389] Exemplarily, the packaging structure 1 is a shell.

[0390] Exemplarily, the first accommodation space 11 is a battery cell cavity.

[0391] Exemplarily, the battery cell 3 is a soft-pack battery cell.

[0392] The soft-pack battery cell in the third embodiment is equivalent to the soft-pack battery cell in the first embodiment.

[0393] The soft-pack battery cell in the third embodiment is equivalent to the soft-pack battery cell in the first embodiment.

[0394] Exemplarily, the conductive terminal 2 is an electrode assembly.

[0395] Exemplarily, the battery cell is a battery 100 .

[0396] In the disclosed embodiment, when a battery cell 3 experiences thermal runaway, the thermal runaway gas within the first accommodation space 11 is ejected from the pressure relief vent 12 under the guidance of the wrapping structure 1, thereby causing the gas ejected from the battery cell during thermal runaway to be ejected in a preset direction, achieving directional ejection of the thermal runaway gas from the battery cell. This preset direction is the direction from the wrapping structure 1 toward the pressure relief vent 12. The conductive terminal 2 and the pressure relief vent 12 are located on different sides of the wrapping structure 1, so that the thermal runaway gas ejected from the pressure relief vent 12 can avoid the conductive terminal 2 as much as possible.

[0397] In one embodiment, referring to FIG. 11 to FIG. 13 and FIG. 18 to FIG. 20 , the conductive terminal 2 is located on one side of the package structure 1 , and the pressure relief port 12 is located on the other side of the package structure 1 opposite to the conductive terminal 2 .

[0398] In the disclosed embodiment, the pressure relief vent 12 is located on the other side of the wrapping structure 1 opposite to the conductive terminal 2. The pressure relief vent 12 can be as far away from the conductive terminal 2 as possible, and the thermal runaway gas ejected from the pressure relief vent 12 can correspondingly be as far away from the conductive terminal 2 as possible.

[0399] It is understandable that the position of the pressure relief vent 12 is not limited. For example, the direction of the package structure 1 toward the pressure relief vent 12 and the direction of the package structure 1 toward the conductive terminal 2 can be arranged crosswise.

[0400] In one embodiment, referring to Figures 19 and 20, the number of battery cells 3 in each battery unit is at least two, and the conductive terminal 2 includes a sampling electrode 22 and at least two transfer electrodes 21, wherein one transfer electrode 21 is electrically connected to the tab 31 of one battery cell 3, and the other transfer electrode 21 is electrically connected to the tab 31 of the other battery cell 3, and the polarities of the tabs 31 corresponding to the two transfer electrodes 21 are opposite, and the sampling electrode 22 is electrically connected to the tabs 31 of the two corresponding battery cells 3, respectively, and the polarities of the tabs 31 of the two corresponding battery cells 3 electrically connected to the sampling electrode 22 are opposite.

[0401] The polarities of the tabs 31 corresponding to at least two of the adapter electrodes 21 are opposite, with one adapter electrode 21 having a positive polarity and the other having a negative polarity. The battery cells 3 of the battery unit can be powered externally through the adapter electrodes 21 and can be charged through the adapter electrodes 21.

[0402] The sampling electrodes 22 are electrically connected to the tabs 31 of the two corresponding battery cells 3, respectively. The polarity of the tabs 31 of the two corresponding battery cells 3 electrically connected to the sampling electrodes 22 is opposite. Each sampling electrode 22 is electrically connected to the positive tab 31 of one battery cell 3 and the negative tab 31 of the other battery cell 3, respectively. The battery cells 3 of the battery unit are connected in series through the sampling electrodes 22.

[0403] Exemplarily, referring to FIG. 19 and FIG. 20 , the switching electrode 21 and the sampling electrode 22 are both bars.

[0404] In the disclosed embodiment, the battery cells 3 of the battery unit are connected in series via the sampling electrode 22, and the battery cells 3 of the battery unit are powered or charged via the adapter electrode 21. The sampling electrode 22 connects the battery cells 3 of the battery unit in series, and the potential of the sampling electrode 22 is the potential between the two battery cells 3 connected in series. By measuring and sampling the voltage between the sampling electrode 22 and the corresponding adapter electrode 21, the operating status of the corresponding battery cell 3 can be identified. Because the conductive terminal 2 and the pressure relief vent 12 are located on different sides of the package structure 1, the thermal runaway gas ejected from the pressure relief vent 12 can avoid the adapter electrode 21 and the sampling electrode 22 as much as possible.

[0405] In one embodiment, referring to Figures 11 to 13, the number of battery cells is at least two, at least one of which is a first battery cell 201, and at least one of which is a second battery cell 202. The side of the first battery cell 201 having the conductive terminal 2 and the side of the second battery cell 202 having the conductive terminal 2 are close to and opposite to each other.

[0406] For example, referring to Figures 11 to 13, the pressure relief vent 12 is located on the other side of the wrapping structure 1 opposite to the conductive terminal 2, the pressure relief vent 12 of the first battery cell 201 is located on the side of the wrapping structure 1 of the first battery cell 201 away from the second battery cell 202, and the pressure relief vent 12 of the second battery cell 202 is located on the side of the wrapping structure 1 of the second battery cell 202 away from the first battery cell 201.

[0407] It should be noted that the side of the first battery cell 201 having the conductive terminal 2 and the side of the second battery cell 202 having the conductive terminal 2 are close to each other and arranged opposite to each other. In the arrangement direction of the first battery cell 201 and the second battery cell 202, a certain distance is separated between the first battery cell 201 and the second battery cell 202, thereby reducing the possibility of short circuit between the conductive terminals 2 of the first battery cell 201 and the conductive terminals 2 of the second battery cell 202 that are close to each other.

[0408] In the embodiment of the present disclosure, a side of the first battery cell 201 having the conductive terminal 2 and a side of the second battery cell 202 having the conductive terminal 2 are close to and opposite to each other. Since each conductive terminal 2 and the corresponding pressure relief vent 12 are on different sides of the corresponding wrapping structure 1, the pressure relief vent 12 of the first battery cell 201 and the pressure relief vent 12 of the second battery cell 202 can avoid the area between the first battery cell 201 and the second battery cell 202 as much as possible. The pressure relief vent 12 of the first battery cell 201 and the pressure relief vent 12 of the second battery cell 202 both avoid each conductive terminal 2. The thermal runaway gas ejected from the pressure relief vent 12 of the first battery cell 201 can avoid the conductive terminal 2 of the second battery cell 202 as much as possible. The thermal runaway gas ejected from the pressure relief vent 12 of the second battery cell 202 can avoid the conductive terminal 2 of the first battery cell 201 as much as possible, which is beneficial to suppress the thermal runaway of the battery cells in the battery pack from spreading to adjacent battery cells.

[0409] In one embodiment, referring to FIG. 11 , the battery pack further includes a second insulating layer 914 , and the space between each first battery cell 201 and the corresponding second battery cell 202 is filled with the second insulating layer 914 , and the second insulating layer 914 covers the conductive terminals 2 of the first battery cell 201 and the second battery cell 202 , respectively.

[0410] The material of the second insulating layer 914 is almost non-conductive.

[0411] In the disclosed embodiment, the conductive terminals 2 of the first and second battery cells 201, 202 are both covered by the second insulating layer 914 within the space between the first and second battery cells 201, 202. This second insulating layer 914 effectively insulates and isolates the conductive terminals 2 of the first and second battery cells 201, 202. Furthermore, the thermal runaway gases generated by a battery cell experiencing thermal runaway are blocked by the second insulating layer 914. This effectively isolates the electrode components from the thermal runaway gases, thereby suppressing the spread of thermal runaway within the battery pack. Furthermore, the conductive terminals 2 of the first and second battery cells 201, 202 are both covered by the second insulating layer 914 within the space between the first and second battery cells 201, 202. The second insulating layer 914 covering the conductive terminals 2 of the first and second battery cells 201 and 202 share the space between the first and second battery cells 201, 202, thereby reducing the space occupied by the second insulating layer 914 and improving energy density.

[0412] In one embodiment, referring to FIG. 11 , the second insulating layer 914 is made of insulating glue. The insulating glue is in liquid form before filling. The liquid insulating glue can solidify between the first battery unit 201 and the second battery unit 202 .

[0413] The liquid insulating glue can be solidified between the first battery cell 201 and the second battery cell 202 , which means that the liquid insulating glue between the first battery cell 201 and the second battery cell 202 can be converted into a solid state and remain in the solid state at normal temperature and pressure.

[0414] Illustratively, the insulating adhesive may be an insulating resin.

[0415] In the embodiment of the present disclosure, the insulating glue is in liquid form before filling, and the liquid insulating glue can be poured into the space between the first battery cell 201 and the second battery cell 202. The liquid insulating glue can flow well in the space between the first battery cell 201 and the second battery cell 202. The flowing liquid insulating glue can be filled into various positions of the space between the first battery cell 201 and the second battery cell 202 as much as possible and solidified, which is conducive to better insulation between the conductive terminals 2 and better separation of the thermal runaway gas from the conductive terminals 2.

[0416] It is understood that the material of the second insulating layer 914 is not limited. For example, the material of the second insulating layer 914 can always be in a solid state.

[0417] In one embodiment, referring to Figures 11 and 12, the number of first battery cells 201 is at least two, and the direction in which at least two first battery cells 201 are arranged in sequence and the direction in which the first battery cells 201 and the second battery cells 202 are arranged are arranged crosswise. The number of second battery cells 202 is at least two, and the direction in which at least two second battery cells 202 are arranged in sequence and the direction in which the first battery cells 201 and the second battery cells 202 are arranged are arranged crosswise.

[0418] For example, referring to FIG. 11 and FIG. 12 , the arrangement direction of the first battery unit 201 and the second battery unit 202 is a first direction.

[0419] For example, referring to FIG. 11 to FIG. 13 , and FIG. 15 and FIG. 16 , the first direction is the direction indicated by the arrow R1 in the figures.

[0420] Exemplarily, referring to FIG. 11 and FIG. 12 , the direction in which at least two first battery units 201 are sequentially arranged is perpendicular to the first direction.

[0421] For example, referring to FIG. 11 and FIG. 12 , the direction in which at least two second battery units 202 are sequentially arranged is perpendicular to the first direction.

[0422] For example, referring to FIG. 11 and FIG. 12 , at least two first battery cells 201 form a corresponding battery module 915 , and at least two first battery cells 201 in the corresponding same battery module 915 are arranged in sequence.

[0423] For example, referring to FIG. 11 and FIG. 12 , at least two second battery cells 202 form a corresponding battery module 915 , and at least two second battery cells 202 in the corresponding same battery module 915 are arranged in sequence.

[0424] For example, referring to Figures 11 and 12, two battery modules 915 are shown, one of which is primarily composed of twelve first battery cells 201 arranged in sequence, and the other is primarily composed of twelve second battery cells 202 arranged in sequence. The direction in which the twelve first battery cells 201 are arranged in sequence is approximately parallel to the direction in which the twelfth second battery cell 202 is arranged in sequence. The direction in which the first battery cells 201 and the second battery cells 202 are arranged is approximately perpendicular to the direction in which the twelve first battery cells 201 are arranged in sequence. The direction in which the first battery cells 201 and the second battery cells 202 are arranged is approximately perpendicular to the direction in which the twelve second battery cells 202 are arranged in sequence. The conductive terminals 2 of the twelve first battery cells 201 are all located on the side of the wrapping structure 1 of the corresponding first battery cell 201 facing the corresponding second battery cell 202, the conductive terminals 2 of the twelve second battery cells 202 are all located on the side of the wrapping structure 1 of the corresponding second battery cell 202 facing the corresponding first battery cell 201, the pressure relief vents 12 of the twelve first battery cells 201 are all located on the side of the wrapping structure 1 of the corresponding first battery cell 201 away from the corresponding second battery cell 202, and the pressure relief vents 12 of the twelve second battery cells 202 are all located on the side of the wrapping structure 1 of the corresponding second battery cell 202 away from the corresponding first battery cell 201.

[0425] In the embodiment of the present disclosure, at least two first battery cells 201 and at least two second battery cells 202 are arranged in sequence. Because the side of the first battery cell 201 having the conductive terminal 2 and the side of the second battery cell 202 having the conductive terminal 2 are close to and opposite to each other, the thermal runaway gas ejected from the pressure relief vents 12 of the sequentially arranged first battery cells 201 can avoid the conductive terminal 2 of the sequentially arranged second battery cells 202 as much as possible, and can also avoid the conductive terminal 2 of the adjacent first battery cells 201 of the at least two sequentially arranged first battery cells 201 as much as possible, which is conducive to suppressing the thermal runaway of the first battery cell 201 from spreading to the adjacent first battery cell 201. The thermal runaway gas ejected from the pressure relief vents 12 of the sequentially arranged second battery cells 202 can avoid the conductive terminal 2 of the sequentially arranged first battery cell 201 as much as possible, and can also avoid the conductive terminal 2 of the adjacent second battery cell 202 of the at least two sequentially arranged second battery cells 202 as much as possible, which is conducive to suppressing the thermal runaway of the second battery cell 202 from spreading to the adjacent second battery cell 202.

[0426] In one embodiment, referring to Figures 13 and 17, the side wall of the second storage space 902 has an exhaust channel 904 and an exhaust hole 905. The exhaust channel 904 is connected to the second storage space 902 through the exhaust hole 905. The exhaust hole 905 is located on the side wall of the second storage space 902 facing the second storage space 902.

[0427] The exhaust channel 904 and the exhaust hole 905 are used to discharge the thermal runaway gas in the second accommodating space 902 out of the box body 901 .

[0428] For example, referring to FIG. 12 , FIG. 13 and FIG. 16 , the side wall of the second receiving space 902 is the target side wall 903 .

[0429] In the embodiment of the present disclosure, the exhaust hole 905 located on the side wall of the second storage space 902 facing the second storage space 902 connects the second storage space 902 in the box body 901 with the exhaust flow channel 904. In the event that thermal runaway occurs in the battery cell in the second storage space 902, the thermal runaway gas generated by the battery cell is discharged into the second storage space 902 through the pressure relief port 12. The thermal runaway gas discharged into the second storage space 902 through the pressure relief port 12 is then discharged to the outside of the box body 901 through the exhaust hole 905 and the corresponding exhaust flow channel 904, thereby reducing the pressure in the box body 901 of the battery pack.

[0430] In one embodiment, referring to FIG. 13 and FIG. 17 , the first battery unit 201 and the second battery unit 202 are arranged in a first direction, and the exhaust holes 905 are located on the sidewalls of the second accommodation space 902 on opposite sides along the first direction.

[0431] For example, referring to FIG. 11 to FIG. 13 and FIG. 15 to FIG. 17 , the first direction is the direction indicated by the arrow R1 in the figures.

[0432] In the disclosed embodiment, vent holes 905 are located on the sidewalls of the second containment space 902 on opposite sides along the first direction. Each vent hole 905 is relatively close to the pressure relief port 12 of the corresponding first battery cell 201 or the pressure relief port 12 of the corresponding second battery cell 202. This allows the thermal runaway gases ejected from each pressure relief port 12 to enter the exhaust duct 904 and exit the housing 901 as quickly as possible through the vent holes 905, thereby reducing the retention of the thermal runaway gases within the housing 901. The vent holes 905 are located on the sidewalls of the second containment space 902 on opposite sides along the first direction. Because the sidewalls of the second containment space 902 on opposite sides along the first direction face away from the conductive terminals 2 of the corresponding battery cells, the thermal runaway gases within the second containment space 902 are discharged through the vent holes 905 located on the sidewalls of the second containment space 902 on opposite sides along the first direction. This facilitates directing the thermal runaway gases away from the corresponding conductive terminals 2, thereby suppressing the spread of thermal runaway within the battery pack.

[0433] It is understood that the position of the exhaust holes 905 is not limited. The exhaust holes 905 can be arranged on two opposite sides of the second receiving space 902 along the first direction.

[0434] In one embodiment, referring to Figures 11 to 15, the battery pack further includes an explosion-proof valve 916. The explosion-proof valve 916 is provided on one or both sides of the box body 901 along the second direction. The second direction is arranged crosswise with the first direction. The exhaust flow channel 904 is selectively connected to the outside of the box body 901 through the explosion-proof valve 916.

[0435] For example, referring to FIG. 11 to FIG. 13 and FIG. 15 , the second direction is the direction indicated by the arrow R2 in the figures.

[0436] The exhaust flow channel 904 is selectively connected to the outside of the box body 901 through the explosion-proof valve 916. When the pressure in the exhaust flow channel 904 is less than the valve opening pressure of the explosion-proof valve 916, the explosion-proof valve 916 cuts off the exhaust flow channel 904 from the outside of the box body 901. When the pressure in the exhaust flow channel 904 is greater than or equal to the valve opening pressure of the explosion-proof valve 916, the explosion-proof valve 916 connects the exhaust flow channel 904 with the outside of the box body 901.

[0437] In the disclosed embodiment, since the exhaust passage 904 selectively communicates with the exterior of the housing 901 via the explosion-proof valve 916, the thermal runaway gas within the second accommodating space 902 of the housing 901 is sequentially discharged to the exterior of the housing 901 through the exhaust holes 905, the exhaust passage 904, and the explosion-proof valve 916, thereby reducing the pressure within the second accommodating space 902 of the housing 901. Since the exhaust holes 905 are located on the sidewalls of the second accommodating space 902 on opposite sides along the first direction, and the explosion-proof valve 916 is provided on one or both sides of the housing 901 along the second direction, the thermal runaway gas has a longer path from the exhaust holes 905 through the exhaust passage 904 to the explosion-proof valve 916, which facilitates cooling of the thermal runaway gas, resulting in a lower temperature of the thermal runaway gas discharged from the explosion-proof valve 916.

[0438] It is understandable that the position of the explosion-proof valve 916 is not limited. For example, the explosion-proof valve 916 can be set on one side or both sides of the box body 901 along the first direction as appropriate.

[0439] In one embodiment, referring to FIG. 11 to FIG. 13 and FIG. 15 to FIG. 17 , the length direction of the second receiving space 902 is arranged along the second direction.

[0440] In the embodiment of the present disclosure, since the exhaust holes 905 are located on the side walls on opposite sides of the second accommodating space 902 along the first direction, and the box body 901 is provided with an explosion-proof valve 916 on one side or both sides along the second direction, the length direction of the second accommodating space 902 is arranged along the second direction, so that the side walls of the second accommodating space 902 along the first direction are longer, which is conducive to increasing the length of the exhaust flow channel 904 in the corresponding side wall, thereby extending the exhaust path of the thermal runaway gas, reducing the exhaust temperature of the thermal runaway gas, and the temperature of the thermal runaway gas discharged from the explosion-proof valve 916 is lower.

[0441] It can be understood that the length direction of the second receiving space 902 can be arranged along the first direction.

[0442] In one embodiment, referring to Figures 13 and 15 to 17 , the sidewall of the second storage space 902 includes a wall 906 and reinforcing ribs 907. Exhaust holes 905 are formed in the wall 906. The reinforcing ribs 907 are connected to the wall 906. The reinforcing ribs 907 and the wall 906 enclose a mutually isolated exhaust channel 904 and a weight-reducing cavity 908. The weight-reducing cavity 908 is located on the side of the exhaust channel 904 facing away from the second storage space 902.

[0443] The wall 906 is the main supporting structure of the side wall of the second receiving space 902 .

[0444] Exemplarily, referring to FIG. 12 , FIG. 13 and FIG. 17 , the sidewall of the second receiving space 902 is the target sidewall 903 .

[0445] For example, referring to FIG. 17 , the reinforcing rib 907 is in the shape of a plate.

[0446] In the disclosed embodiment, exhaust holes 905 are formed in the wall 906, allowing thermal runaway gases within the second storage space 902 to enter the wall 906 through the exhaust holes 905. Reinforcement ribs 907 within the wall 906 and the wall 906 enclose an exhaust channel 904 and a weight-reducing cavity 908. The weight-reducing cavity 908 is located on the side of the exhaust channel 904 facing away from the second storage space 902. The reinforcement ribs 907 increase the overall strength of the second storage space 902, while the weight-reducing cavity 908 reduces the weight of the sidewalls of the second storage space 902. Sufficient strength of the sidewalls of the second storage space 902 can help improve the energy density of the battery pack. The weight reduction chamber 908 is located on the side of the exhaust flow channel 904 away from the second containing space 902. The weight reduction chamber 908 is relatively far away from the second containing space 902, and the exhaust flow channel 904 is relatively close to the second containing space 902, so that the exhaust flow channel 904 is connected with the exhaust hole 905 close to the second containing space 902 to receive the thermal runaway gas in the second containing space 902.

[0447] It is understandable that the specific structure of the side wall of the second receiving space 902 is not limited. For example, the side wall of the second receiving space 902 may include a wall body 906 but not include a reinforcing rib 907.

[0448] In one embodiment, referring to Figures 15 to 17 , a box body 901 includes a main box 909 and a box cover 912. A second storage space 902 is formed in the main box 909. A first protrusion 910 and a second protrusion 911 are formed above the main box 909. The second protrusion 911 is located on the side of the first protrusion 910 facing away from the second storage space 902. The box cover 912 covers the second storage space 902 of the main box 909. The box cover 912 has a sealing portion 913. The sealing portion 913 is provided between the first protrusion 910 and the second protrusion 911 and on the side of the second protrusion 911 facing away from the first protrusion 910. The sealing portion 913 contacts and seals the main box 909 along the arrangement direction of the main box 909 and the box cover 912.

[0449] The second accommodating space 902 is formed in the main box 909 , and the sidewalls of the second accommodating space 902 are formed on the main box 909 .

[0450] Exemplarily, referring to FIG. 13 and FIG. 15 to FIG. 17 , the exhaust hole 905 and the exhaust flow channel 904 are formed in the main box 909 .

[0451] For example, referring to FIG. 11 to FIG. 15 , the explosion-proof valve 916 is installed on the main box 909 .

[0452] For example, referring to FIG. 16 , the arrangement direction of the main box 909 and the box cover 912 is the direction indicated by the arrow R3 in the figure.

[0453] Exemplarily, the first protrusion 910 and the second protrusion 911 are arranged to extend along the circumference of the second accommodation space 902 .

[0454] In the disclosed embodiment, a cover 912 is provided on the second storage space 902 of the main case 909, thereby sealing the battery cells in the second storage space 902 within the case body 901. The cover 912, near the sealing portion 913, forms a multi-curved flow channel structure with the first and second protrusions 910 of the main case 909. This multi-curved flow channel structure creates greater resistance to fluid flow, thus preventing thermal runaway gases in the second storage space 902 of the main case 909 from escaping from between the main case 909 and the cover 912. This provides a good seal between the main case 909 and the cover 912.

[0455] It is understandable that the specific structure of the box body 901 is not limited. For example, the first protrusion 910 and the second protrusion 911 may not be provided on the top of the main box 909, and the top of the main box 909 may be a flat surface.

[0456] In one embodiment, referring to FIG. 18 to FIG. 20 , the battery unit is a battery 100 , and the battery unit further includes a pressure relief component 917 covering the pressure relief port 12 , and the pressure relief component 917 is a flame retardant cover 4 .

[0457] In one embodiment, referring to FIG. 18 to FIG. 20 , the battery unit further includes a flame retardant cover 4 covering the pressure relief port 12 , and the pressure bearing capacity of the wrapping structure 1 is greater than that of the flame retardant cover 4 .

[0458] Pressure bearing capacity refers to the ability to withstand fluid pressure.

[0459] The relative size of the pressure-bearing capacity can be measured by filling the package structure 1 with gas. Specifically, because the flame-retardant cover 4 covers the pressure relief port 12, the package structure 1 and the flame-retardant cover 4 substantially seal the first storage space 11. When gas is filled into the first storage space 11, the air pressure in the first storage space 11 continuously increases, and the gas pressure borne by the package structure 1 and the flame-retardant cover 4 continuously increases. As gas is continuously filled into the first storage space 11, the flame-retardant cover 4 breaks before the package structure 1, indicating that the pressure-bearing capacity of the flame-retardant cover 4 is less than that of the package structure 1, and the pressure-bearing capacity of the package structure 1 is greater than that of the flame-retardant cover 4.

[0460] The flame retardant cover 4 has a certain flame retardant ability. In the case of thermal runaway of the battery cell, the flame retardant cover 4 may be deformed due to the high temperature, but will basically not be ignited.

[0461] In the embodiment of the present disclosure, the flame retardant cover 4 is provided on the pressure relief port 12. The flame retardant cover 4 has a certain flame retardant ability, which can reduce, to a certain extent, the possibility of the flame retardant cover 4 being ignited in the event of thermal runaway of the battery cell. The flame retardant cover 4 is provided on the pressure relief port 12. In the event of thermal runaway of the adjacent battery cell, it can reduce the thermal runaway gas generated by the adjacent battery cell from entering the first storage space 11 through the pressure relief port 12, which is beneficial to suppress the spread of thermal runaway to a certain extent. In the event of thermal runaway of the battery cell 3 in the first storage space 11, since the pressure bearing capacity of the wrapping structure 1 is greater than the pressure bearing capacity of the flame retardant cover 4, the thermal runaway gas in the first storage space 11 first breaks through the flame retardant cover 4, causing the thermal runaway gas in the first storage space 11 to erupt directionally from the pressure relief port 12.

[0462] In one embodiment, referring to FIG. 18 to FIG. 20 , the flame retardant cover 4 is made of mica.

[0463] Exemplarily, the flame retardant cover 4 may be mica paper.

[0464] Exemplarily, the flame retardant cover 4 is mica paper.

[0465] Exemplarily, the mica paper is bonded to the wrapping structure 1 .

[0466] In the embodiment of the present disclosure, the flame retardant cover 4 is made of mica. Mica has a certain flame retardant ability and will basically not be ignited in the event of thermal runaway of the battery cell. The thinner the flame retardant cover 4 made of mica, the smaller the pressure bearing capacity.

[0467] In one embodiment, referring to Figures 18 to 20 , the package structure 1 includes a housing 13 and a top cover 14 . A pressure relief vent 12 is formed in the housing 13 . The top cover 14 and the housing 13 enclose a first receiving space 11 , and the conductive terminal 2 is disposed in the top cover 14 .

[0468] Exemplarily, the housing 13 is a main shell.

[0469] In the embodiment of the present disclosure, before the top cover 14 is installed on the shell 13, the conductive terminal 2 on the top cover 14 can be electrically connected to the tab 31 of the battery cell 3, and then the connected top cover 14, conductive terminal 2 and battery cell 3 can be installed to the shell 13, so as to facilitate the connection of the conductive terminal 2 and the battery cell 3 before entering the shell.

[0470] In one embodiment, referring to FIG. 18 to FIG. 20 , the shell 13 is made of metal or plastic, and the top cover 14 is made of plastic.

[0471] Exemplarily, the shell 13 is made of metal, and the thickness of the shell 13 is 0.1 mm to 1 mm.

[0472] Illustratively, the thickness of the housing 13 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, or 1 mm.

[0473] Exemplarily, the shell 13 is made of plastic, is an integrally formed structure, and has a thickness of 1 mm to 3 mm.

[0474] Illustratively, the thickness of the housing 13 may be 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.3 mm, 2.6 mm, 2.9 mm, or 3 mm.

[0475] In the disclosed embodiment, the metal or plastic housing 13 effectively protects the battery cells 3 within the first accommodation space 11. The plastic top cover 14 provides excellent insulation, facilitating installation of the conductive terminals 2. The mica flame-retardant cover 4 prevents ignition in the event of thermal runaway and facilitates fabrication with a structure having a reduced pressure-bearing capacity.

[0476] It is understandable that the materials of the wrapping structure 1 and the flame retardant cover 4 can be set according to actual needs.

[0477] In one embodiment, the ignition point of the flame retardant cover 4 and the ignition point of the wrapping structure 1 are both greater than or equal to 800°C.

[0478] For example, the ignition point of the flame retardant cover 4 may be 800° C., 810° C., 860° C., or 900° C., etc.

[0479] For example, the ignition point of the flame retardant cover 4 can be measured by heating the flame retardant cover 4 to a state where the flame retardant cover just burns.

[0480] For example, the ignition point of the package structure 1 can be measured by heating the package structure 1 to a state where the package structure just burns.

[0481] In the embodiment of the present disclosure, the ignition points of the flame retardant cover 4 and the wrapping structure 1 are relatively high, and even under the influence of thermal runaway gas at a relatively high temperature, the flame retardant cover 4 and the wrapping structure 1 will basically not be ignited.

[0482] In one embodiment, referring to FIG. 22 , the top cover 14 has a flange 141 covering the side wall of the housing 13 , and a gap between the flange 141 and the side wall of the housing 13 is less than or equal to 0.5 mm.

[0483] Exemplarily, the gap between the flange 141 and the side wall of the housing 13 may be 0.5 mm, 0.4 mm, 0.3 mm, 0.2 mm or 0.1 mm.

[0484] For example, before the top cover 14 is installed into the shell 13 but before the top cover 14 is connected to the shell 13 , the dimension between the flange 141 and the side wall of the shell 13 can be measured by a feeler gauge, a vernier caliper, or a micrometer.

[0485] For example, the span of the flange 141 of the top cover 14 and the corresponding span of the shell 13 can be measured separately by a vernier caliper or a micrometer, and half of the difference between the two is the gap between the top cover 14 and the shell 13.

[0486] Exemplarily, referring to FIG. 22 , the gap between the flange 141 and the side wall of the housing 13 is D1 , and D1 ≤ 0.5 mm.

[0487] In the embodiment of the present disclosure, the flange 141 is not completely sealed from the side wall of the shell 13, and the gap between the flange 141 and the side wall of the shell 13 is relatively appropriate, so that the resistance to the escape of thermal runaway gas from between the flange 141 and the side wall of the shell 13 is relatively large, which can better suppress the thermal runaway gas from erupting toward the top cover 14, thereby better guiding the thermal runaway gas in the second accommodating space 902 to erupt in a directional manner from the pressure relief port 12.

[0488] It is understandable that there may be no gap between the shell 13 and the top cover 14 , and the shell 13 and the top cover 14 may be completely sealed.

[0489] In one embodiment, please refer to Figure 18, the flame retardant cover 4 is formed with a through hole 42 connected to the first accommodating space 11, and the battery unit also includes a temperature regulating container 5 partially located in the first accommodating space 11, and a battery cell 3 is arranged on one side or two opposite sides of the temperature regulating container 5. The temperature regulating container 5 has a temperature regulating cavity and an inlet 52 and an outlet 53 respectively connected to the temperature regulating cavity. The temperature regulating container 5 is passed through the through hole 42 so that the inlet 52 and the outlet 53 are exposed outside the battery cell along the wrapping structure 1 toward the side of the flame retardant cover 4.

[0490] For example, referring to FIG. 20 , battery cells 3 are provided on two opposite sides of the temperature regulating container 5 , with two battery cells 3 on each side.

[0491] For example, referring to FIG. 20 , two battery cells 3 on each side are connected in series via corresponding sampling electrodes 22 , and two battery cells 3 on each side are powered or charged via corresponding two switching electrodes 21 .

[0492] For example, referring to FIG. 21 , the number of battery cells 3 on each side may be one.

[0493] For example, the number of battery cells 3 on each side may be one, and the battery cells 3 on both sides may be connected in series via corresponding sampling electrodes 22 .

[0494] Exemplarily, referring to FIG. 21 , the temperature regulating container 5 and the corresponding battery cell 3 are arranged along a preset direction, and the preset direction is perpendicular to the surface of the battery cell 3 with the largest area.

[0495] Exemplarily, referring to FIG. 21 , the preset direction is the direction indicated by arrow R4 in the figure.

[0496] In the disclosed embodiment, the inlet 52 and outlet 53 of the temperature-regulating container 5 extend outside the first accommodation space 11 through the through-hole 42 of the flame-retardant cover 4. This facilitates connecting the temperature-regulating container 5 to an external fluid source through the inlet 52 and outlet 53, allowing external fluid to enter the temperature-regulating container 5 through the inlet 52 and exit through the outlet 53, thereby regulating the temperature of the battery cell 3. Since the inlet 52 and outlet 53 of the temperature-regulating container 5 extend outside the first accommodation space 11 through the through-hole 42 of the flame-retardant cover 4, the through-hole 42 does not need to be sealed, which helps simplify the structure of the battery cell.

[0497] The embodiment of the present disclosure also provides a battery module 915, please refer to Figures 11 and 12, the battery module 915 includes at least two battery cells arranged in sequence, each battery cell includes a wrapping structure 1 and at least one battery cell 3, a first accommodating space 11 is formed inside the wrapping structure 1, at least one battery cell 3 is arranged in the first accommodating space 11, at least one side of the wrapping structure 1 is provided with a conductive terminal 2 for electrical connection with other structures, at least one side of the wrapping structure 1 is provided with a pressure relief port 12 for pressure relief, the conductive terminal 2 and the pressure relief port 12 are located on different sides of the wrapping structure 1, the conductive terminals 2 of the at least two battery cells arranged in sequence have the same orientation, and in the at least two battery cells arranged in sequence, the orientation of the conductive terminals 2 is cross-arranged with the direction in which the at least two battery cells are arranged in sequence.

[0498] For example, referring to FIG. 11 and FIG. 12 , in at least two battery cells arranged in sequence, the conductive terminal 2 is oriented perpendicular to the direction in which the at least two battery cells are arranged in sequence.

[0499] For example, referring to FIG. 11 and FIG. 12 , the conductive terminals 2 of the first battery cells 201 in the same battery module 915 are all oriented toward the corresponding second battery cells 202 .

[0500] For example, referring to FIG. 11 and FIG. 12 , the conductive terminals 2 of the second battery cells 202 in the same battery module 915 all face the corresponding first battery cells 201 .

[0501] For example, please refer to FIG. 11 and FIG. 12 , which show two battery modules 915 .

[0502] In the embodiment of the present disclosure, the number of battery cells in the battery module 915 is at least two. Since the conductive terminal 2 and the pressure relief vent 12 are located on different sides of the wrapping structure 1, and the conductive terminals 2 of at least two battery cells arranged in sequence have the same orientation, in the at least two battery cells arranged in sequence, the orientation of the conductive terminal 2 is arranged crosswise with the direction in which the at least two battery cells are arranged in sequence, so that the pressure relief vent 12 of each battery cell in the battery module 915 can avoid the conductive terminal 2 of each battery cell, reducing the possibility that the thermal runaway gas ejected from the pressure relief vent 12 of any battery cell will short-circuit the conductive terminal 2 of the adjacent battery cell, thereby facilitating the thermal runaway of the battery cell from spreading to the adjacent battery cell.

[0503] The embodiment of the present disclosure also provides a battery cell, please refer to Figures 18 to 20, the battery cell includes a wrapping structure 1 and at least one battery cell 3, a first accommodating space 11 is formed inside the wrapping structure 1, at least one battery cell 3 is arranged in the first accommodating space 11, at least one side of the wrapping structure 1 is provided with a conductive terminal 2 for electrical connection to other structures, at least one side of the wrapping structure 1 is provided with a pressure relief port 12 for pressure relief, and the conductive terminal 2 and the pressure relief port 12 are located on different sides of the wrapping structure 1.

[0504] In the embodiment of the present disclosure, the conductive terminal 2 and the pressure relief vent 12 are located on different sides of the wrapping structure 1, so that the pressure relief vent 12 of the battery cell can be away from the conductive terminal 2. When at least two battery cells are arranged in sequence and the conductive terminals 2 of the at least two battery cells arranged in sequence are oriented in the same direction, the pressure relief vent 12 of the at least two battery cells arranged in sequence can avoid the conductive terminals 2 of each battery cell, and the thermal runaway gas ejected from the pressure relief vent 12 can be as far away from the conductive terminal 2 of the adjacent battery cell as possible, reducing the possibility of short-circuiting the conductive terminals 2 of the adjacent battery cell, thereby suppressing the possibility of thermal runaway of the battery cell spreading to the adjacent battery cell.

[0505] In one embodiment, referring to Figures 11 to 22 , the battery cell's top cover 14, housing 13, and mica paper serving as the flame-retardant cover 4 do not need to be completely sealed; they only need to guide the thermal runaway gas within the first accommodation space 11 to escape through the pressure relief vent 12. A battery cell 3 is disposed within the space enclosed by the housing 13, top cover 14, and flame-retardant cover 4. There are at least two battery cells, at least one of which is a first battery cell 201 and at least one of which is a second battery cell 202. The side of the first battery cell 201 with the conductive terminal 2 and the side of the second battery cell 202 with the conductive terminal 2 are positioned adjacent to and opposite each other. The space between each first battery cell 201 and the corresponding second battery cell 202 is filled with a second insulating layer 914, which covers the conductive terminal 2 of each first battery cell 201 and second battery cell 202, respectively. The second insulating layer 914 is made of insulating adhesive, which is liquid before being filled and solidifies between the first and second battery cells 201, 202. The conductive terminal 2 is located on one side of the package structure 1, and the pressure relief vent 12 is located on the other side of the package structure 1 opposite the conductive terminal 2. There are at least two first battery cells 201, and at least two first battery cells 201 form a corresponding battery module 915. The at least two first battery cells 201 in the same battery module 915 are arranged in sequence. There are at least two second battery cells 202, and at least two second battery cells 202 form a corresponding battery module 915. The at least two second battery cells 202 in the same battery module 915 are arranged in sequence. The box body 901 includes a main box 909 and a box cover 912. A second storage space 902 is formed in the main box 909. A first protrusion 910 and a second protrusion 911 are formed above the main box 909. The second protrusion 911 is located on the side of the first protrusion 910 facing away from the second storage space 902. A cover 912 covers the second storage space 902 of the main box 909. Cover 912 has a sealing portion 913. Seals 913 are provided between the first protrusion 910 and the second protrusion 911, as well as on the side of the second protrusion 911 facing away from the first protrusion 910. Seals 913 contact and seal with the box body 901 along the alignment of the main box 909 and the cover 912. Sealant can be filled between the sealing portion 913 and the main box 909 to improve the seal between the main box 909 and the cover 912. The sidewalls of the second storage space 902 include a wall 906 and reinforcing ribs 907. Exhaust holes 905 are formed in the wall 906. The reinforcing ribs 907 are connected to the wall 906. The reinforcing ribs 907 and the wall 906 enclose a mutually isolated exhaust duct 904 and a weight-reducing cavity 908. The weight-reducing cavity 908 is located on the side of the exhaust duct 904 facing away from the second storage space 902. The box cover 912 and the main box 909 are connected by screws, and the screws are located on the side of the reinforcing rib 907 away from the exhaust flow channel 904. The weight reduction cavity 908 can be communicated with the outside of the box body 901.The conductive terminal 2 mounted on the top cover 14 is a bar. The first battery unit 201 and the second battery unit 202 are arranged in a first direction, and the exhaust holes 905 are located on the side walls of the second storage space 902 on opposite sides along the first direction. An explosion-proof valve 916 is provided on one or both sides of the box body 901 along the second direction. The second direction is arranged crosswise with the first direction, and the exhaust flow channel 904 is selectively connected to the outside of the box body 901 through the explosion-proof valve 916. The side walls of the second storage space 902 of the box body 901 can be made of aluminum extrusion profiles or magnesium extrusion profiles. The bottom plate of the box cover 912 and the main box 909 can be made of sheet metal, composite materials or carbon fiber.

[0506] The above embodiments are intended only to illustrate the technical solutions of the present disclosure, and are not intended to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. Such modifications or replacements do not deviate from the essence of the corresponding technical solutions and are intended to be included within the scope of the present disclosure. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts.

Claims

1. A battery comprising: A wrapping structure, forming a first accommodating space, wherein a pressure relief port communicating with the first accommodating space is formed on one side of the wrapping structure, and the rest of the wrapping structure is a sealing structure; a conductive terminal connected to the package structure, wherein the conductive terminal and the pressure relief port are located on different sides of the package structure; A battery cell is located in the first accommodation space, and a tab of the battery cell is electrically connected to the conductive terminal.

2. The battery according to claim 1, wherein The battery also includes a pressure relief assembly connected to the wrapping structure, the pressure relief assembly cover is arranged on the pressure relief port to shield the pressure relief port, and the pressure relief assembly is used to open the pressure relief port under the action of the air pressure in the first accommodation space to relieve pressure in the first accommodation space.

3. The battery according to claim 2, wherein The pressure relief assembly includes a one-way pressure relief device, and the one-way pressure relief device cover is arranged on the pressure relief port to cover the pressure relief port. The one-way pressure relief device is used to open the pressure relief port under the action of the air pressure in the first accommodating space to relieve pressure in the first accommodating space. The one-way pressure relief device is also used to press toward the pressure relief port under the action of the force of the side of the one-way pressure relief device away from the pressure relief port to keep the pressure relief port covered.

4. The battery according to claim 3, wherein The one-way pressure reliever is connected to the wrapping structure on one side along the target direction, and is used to deform under the action of external force to move closer to or away from the pressure relief port on the other side along the target direction. The target direction is arranged crosswise with the opening direction of the pressure relief port.

5. The battery according to claim 4, wherein The one-way pressure relief device comprises: a baffle, covering the pressure relief port; The mounting plate is respectively connected to the baffle and the side wall of the wrapping structure. The mounting plate is located on one side of the baffle along the target direction. The mounting plate and the baffle are arranged crosswise. The side of the baffle away from the mounting plate along the target direction is used to deform under the action of external force to approach or move away from the pressure relief port.

6. The battery according to claim 5, wherein The mounting plate and the baffle are integrally formed.

7. The battery according to claim 5 or 6, wherein The baffle and the wrapping structure are in contact with or spaced apart from each other at the pressure relief port.

8. The battery according to any one of claims 5 to 7, wherein Projected along the opening direction of the pressure relief port, the projection area of ​​the pressure relief port is located within the projection area of ​​the baffle.

9. The battery according to any one of claims 5 to 8, wherein The baffle is in the shape of an elongated strip, and the width direction of the baffle is arranged along the target direction.

10. The battery according to any one of claims 5 to 9, wherein The mounting plate is adhesively bonded to the wrapping structure.

11. The battery according to any one of claims 5 to 10, wherein The pressure relief assembly has a weakened portion, which is used to enable the pressure relief assembly to open the pressure relief port under the action of the air pressure in the first accommodating space to relieve pressure in the first accommodating space. The weakened portion is formed on the one-way pressure reliever and is located on the side of the baffle toward the mounting plate along the target direction.

12. The battery according to claim 11, wherein The weakened portion is a weakened hole, which is a through hole. The weakened hole penetrates the baffle along the thickness direction of the baffle and / or the weakened hole penetrates the mounting plate along the thickness direction of the mounting plate.

13. The battery according to claim 11 or 12, wherein The intersection line formed by the surface of the baffle facing the wrapping structure and the surface of the mounting plate facing the wrapping structure is a preset intersection line, the weakened portion is a weakened hole, the number of the weakened holes is at least two, and at least two weakened holes are arranged at intervals along the preset intersection line.

14. The battery according to any one of claims 4 to 13, wherein The package structure includes: a housing, the pressure relief port being formed on one side of the housing, and the one-way pressure relief device being connected to the housing; The top cover is installed on the shell, the top cover and the shell enclose a first accommodation space, and the conductive terminal is installed on the top cover.

15. The battery according to any one of claims 3 to 14, wherein The one-way pressure relief device is made of metal.

16. The battery according to claim 15, wherein The one-way pressure relief device is made of titanium or titanium alloy.

17. The battery according to any one of claims 3 to 16, wherein The melting point of the material of the one-way pressure relief device is greater than or equal to 1000°C.

18. The battery according to any one of claims 3 to 17, wherein The pressure relief assembly also includes a pressure relief cover, which is arranged on the pressure relief port, the pressure relief cover is sealed with the wrapping structure, and the one-way pressure relief device is located inside the pressure relief cover. The pressure bearing capacity of the pressure relief cover and the one-way pressure relief device are both less than the pressure bearing capacity of the wrapping structure.

19. The battery according to claim 18, wherein The material of the pressure relief cover is mica.

20. The battery according to claim 2, wherein The pressure relief component is an insulating film, and the melting point of the insulating film is less than or equal to 500°C.

21. The battery according to any one of claims 2 to 20, wherein The pressure relief component has a weakened portion, and the weakened portion is used to enable the pressure relief component to open the pressure relief port under the action of the air pressure in the first accommodating space to relieve pressure in the first accommodating space.

22. The battery according to claim 21, wherein The weakened portion is a weakened hole, and the pressure relief assembly has at least one row of weakened holes, with each row having at least two weakened holes.

23. The battery according to claim 21, wherein The weakened portion is a notch.

24. The battery according to any one of claims 1 to 23, wherein The battery cell is a soft-pack battery cell.

25. A battery pack comprising: Box; The battery according to any one of claims 1 to 24, located in the box.

26. An electrical device comprising: Device body; The battery pack according to claim 25 is mounted on the device body to supply power to the device body.

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