Battery, battery pack and electrical apparatus

Abstract

The embodiments of the present disclosure belong to the technical field of batteries. Provided are a battery, a battery pack and an electrical apparatus. A wrapping structure forms an accommodation space, one side of the wrapping structure forming a pressure relief port communicated with the accommodation space, and the remaining portion of the wrapping structure being of a sealed structure. The wrapping structure comprises a casing and a top cover, the pressure relief port being formed in one side of the casing, the top cover and the casing defining the accommodation space, and the casing comprises a plurality of bending plates which bend in sequence. A conductive terminal is connected to the wrapping structure, the conductive terminal is installed on the top cover, and the conductive terminal and the pressure relief port are located on different sides of the wrapping structure. A battery cell is located in the accommodation space, and tabs of the battery cell are electrically connected to the conductive terminal. The bending plates at the two ends of the battery cell in the circumferential direction are connected, and the plurality of bending plates define the pressure relief port. The top cover and the pressure relief port are respectively located on the two opposite sides of the casing, and the top cover and the plurality of bending plates define the accommodation space. The battery of the embodiments of the present disclosure reduces the difficulty of installing the battery cell and the casing.

Description

Battery, battery pack and power-consuming device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on Chinese patent application number 2024102544278, application date March 6, 2024, and invention name “A battery, a battery pack, an electrical device and a battery module”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into the present disclosure as a 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] The battery is installed in the box of the battery pack, and the battery cells are installed in the shell of the packaging structure. In the related art, it is difficult to install the battery cells in the shell. 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, aiming to reduce the difficulty of installing the battery cells and the housing.

[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 forms an accommodating space, a pressure relief port connected to the accommodating space is formed on one side of the wrapping structure, and the rest of the wrapping structure is a sealing structure. The wrapping structure includes a shell and a top cover, the pressure relief port is formed on one side of the shell, the top cover and the shell enclose the accommodating space, and the shell includes a plurality of bent plates that are bent in sequence;

[0010] a conductive terminal connected to the package structure, the conductive terminal being mounted on the top cover, the conductive terminal and the pressure relief port being located on different sides of the package structure;

[0011] A battery cell is located in the accommodating space, the tabs of the battery cell are electrically connected to the conductive terminals, the bent plates at both ends of the circumference of the battery cell are connected, and multiple bent plates are arranged to form the pressure relief port. The top cover and the pressure relief port are respectively located on opposite sides of the shell, and the top cover and multiple bent plates are arranged to form the accommodating space.

[0012] In the embodiment of the present disclosure, since the shell is not an integrally formed structure, before the battery cell is installed in the shell, the shell can be placed in an unfolded state or the multiple bent plates of the shell can be appropriately unfolded. After unfolding, the installation of the battery cell is no longer limited by the internal space of the shell. During the process of installing the battery cell into the shell, the battery cell is almost not squeezed or scratched by the shell, and the battery cell can be installed in the shell more conveniently, thereby reducing the difficulty of installation between the battery cell and the shell.

[0013] In one embodiment, the shell is made of metal, and the battery further includes a reinforcing plate, which is located on the inner surface of the shell. The bent plates at both ends of the circumference of the battery cell are connected by welding, and the welding positions of the bent plates at both ends of the circumference of the battery cell are target positions, and the reinforcing plate is welded to the shell at the target position.

[0014] In the disclosed embodiment, the shell and the reinforcing plate are welded together by welding the reinforcing plate to the shell at the target position. The reinforcing plate supports the shell at the target position, thereby reducing the possibility of the bent plates at both ends of the shell being welded through during the welding process.

[0015] In one embodiment, the reinforcing plate is located between the bent plates at both ends of the battery cell along the circumference.

[0016] In the embodiment of the present disclosure, during the welding process, the welding mark welds the reinforcing plate through so that both sides of the reinforcing plate are respectively connected to the corresponding bent plates. The welded reinforcing plate can more firmly connect the bent plates on both sides.

[0017] In one embodiment, the bent plates at both ends of the battery cell in the circumferential direction are both located on a side of the reinforcing plate facing away from the battery cell.

[0018] In the disclosed embodiment, the weld mark does not need to penetrate the reinforcing plate, that is, the bent plates at both ends of the circumference can be welded together. Since the weld mark does not need to penetrate the reinforcing plate, the possibility of damage to the battery cell during the welding process is reduced.

[0019] In one embodiment, the packaging structure further includes an insulating layer, and the insulating layer covers the inner surface of the shell.

[0020] In the disclosed embodiment, the housing is generally flat in its unfolded state. The insulating layer can be placed over the unfolded housing before the housing and the insulating layer are bent together. After the housing is bent and formed, the insulating layer covers the inner surface of the housing. Placing the insulating layer over the housing in its unfolded state allows for easier installation.

[0021] In one embodiment, the battery further includes a separator layer, and the battery cells are provided on opposite sides of the separator layer in the thickness direction to separate the battery cells on both sides. The shell is made of metal, and the bent plates at both ends of the battery cell in the circumferential direction are welded to form a weld mark. The weld mark is located on one side of the separator layer along a preset direction, and the preset direction is perpendicular to the thickness direction of the separator layer. The projection area of ​​the weld mark along the preset direction is located within the projection area of ​​the separator layer along the preset direction.

[0022] In the embodiment of the present disclosure, since the projection area of ​​the weld mark along the preset direction is located within the projection area of ​​the separator layer along the preset direction, the weld mark avoids the battery cells on both sides of the separator layer as much as possible, thereby reducing the possibility of damage to the battery cells during the welding process.

[0023] In one embodiment, the maximum span of the weld mark along the thickness direction of the separator layer is a preset distance, the ratio of the thickness of the separator layer to the preset distance is greater than or equal to 1.2, and the ratio of the thickness of the separator layer to the preset distance is less than or equal to 3.

[0024] In the disclosed embodiment, the ratio of the separator layer thickness to the preset distance is greater than or equal to 1.2. This thickness is sufficient relative to the preset distance of the weld mark, allowing the weld mark to be as far away from the battery cells on either side of the separator layer as possible, reducing damage to the battery cells during welding. The ratio of the separator layer thickness to the preset distance is less than or equal to 3, which limits the separator layer thickness and, to a certain extent, helps improve the volumetric energy density of the battery.

[0025] In one embodiment, a ratio of the thickness of the separation layer to the preset distance is greater than or equal to 1.5, and a ratio of the thickness of the separation layer to the preset distance is less than or equal to 2.5.

[0026] In the disclosed embodiment, the ratio of the separator layer thickness to the preset distance is greater than or equal to 1.5. This thickness is sufficient relative to the preset distance of the weld mark, allowing the weld mark to be as far away from the battery cells on either side of the separator layer as possible, reducing damage to the battery cells during welding. The ratio of the separator layer thickness to the preset distance is less than or equal to 2.5, which limits the separator layer thickness and, to a certain extent, helps improve the volumetric energy density of the battery.

[0027] In one embodiment, the thickness direction of the separation layer is arranged to intersect with the large surface of the battery cell.

[0028] In the disclosed embodiment, since the expansion of the battery cell during the charge and discharge process is mainly in a direction perpendicular to the large surface of the battery cell, the thickness direction of the separator layer is arranged crosswise with the large surface direction of the battery cell, which is beneficial to provide sufficient space for the expansion of the battery cell, thereby better buffering the expansion of the battery cell.

[0029] In one embodiment, the battery cell is a soft-pack battery cell.

[0030] A second aspect of the present disclosure provides a battery pack, including:

[0031] Box;

[0032] The battery of any of the aforementioned embodiments is located in the box.

[0033] A third aspect of the present disclosure provides an electrical device, including:

[0034] Device body;

[0035] The battery pack of any of the aforementioned embodiments is installed in the device body to supply power to the device body.

[0036] The battery provided in the embodiment of the present disclosure has a shell that is not an integrally formed structure. Therefore, before the battery cell is installed in the shell, the shell can be placed in an unfolded state or the multiple bent plates of the shell can be appropriately unfolded. After unfolding, the installation of the battery cell is no longer restricted by the internal space of the shell. During the process of installing the battery cell into the shell, the battery cell is hardly squeezed or scratched by the shell, and the battery cell can be installed in the shell more conveniently, thereby reducing the difficulty of installation between the battery cell and the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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;

[0038] FIG2 is a schematic structural diagram of a battery according to an embodiment of the present disclosure, showing conductive terminals;

[0039] FIG3 is an exploded view of a battery according to an embodiment of the present disclosure;

[0040] FIG4 is an assembly diagram of a housing and an insulating layer according to an embodiment of the present disclosure;

[0041] FIG5 is a schematic diagram of position AA in FIG4 ;

[0042] FIG6 is an enlarged view of position B in FIG5;

[0043] FIG7 is a layout diagram of a temperature regulating container and a battery cell according to an embodiment of the present disclosure;

[0044] FIG8 is a schematic structural diagram of a temperature regulating container according to an embodiment of the present disclosure;

[0045] FIG9 is an assembly diagram of the top cover and the housing according to an embodiment of the present disclosure;

[0046] FIG10 is a layout diagram of at least two batteries arranged sequentially according to an embodiment of the present disclosure;

[0047] FIG11 is an assembly diagram of a housing and battery cells within the housing according to an embodiment of the present disclosure. The diagram illustrates the cross-section of the housing. The housing shown in the diagram does not imply a specific embodiment of a housing connection structure. Adjacent battery cells may or may not have a separator layer between them.

[0048] FIG12 is a cross-sectional view taken at position CC in FIG11 , in which the bent plates at both ends of the battery cell in the circumferential direction are both located on the side of the reinforcing plate facing away from the battery cell;

[0049] FIG13 is an enlarged view of a position D in FIG12;

[0050] FIG14 is a cross-sectional view taken at position CC in FIG11 , in which the reinforcing plate is located between the bent plates at both ends of the battery cell in the circumferential direction;

[0051] FIG15 is an enlarged view of position E in FIG14;

[0052] FIG16 is a cross-sectional view taken at position CC in FIG11 , in which a separator is provided between two adjacent battery cells;

[0053] FIG17 is a view in the direction of F in FIG16;

[0054] FIG18 is a schematic structural diagram of a bare battery cell with a wound structure according to an embodiment of the present disclosure;

[0055] FIG19 is a schematic structural diagram of a bare cell of a laminated structure according to an embodiment of the present disclosure.

[0056] Explanation of the accompanying symbols 1. Wrapping structure; 11. Accommodating space; 12. Pressure relief vent; 13. Shell; 131. Bending plate; 14. Top cover; 141. Flanged edge; 15. 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 cavity; 52. Inlet; 53. Outlet; 54. Container body; 55. First guide plate; 56. Second guide plate; 6. Reinforcement plate; 100. Battery; 7. Separator; 8. Welding mark; 91. Positive electrode sheet; 92. Negative electrode sheet; 93. Isolator; 94. Flat area; 95. Corner area DETAILED DESCRIPTION

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] In related art, the battery housing structure is generally an integrally formed structure, with the battery housing surrounding the battery cells and one or at least two battery cells located within the housing. The top cover and pressure relief vent are located on opposite sides of the housing. The battery cells nearly completely fill the interior of the housing in a direction perpendicular to the arrangement of the top cover and pressure relief vent. Therefore, during installation of the battery cells into the housing, due to the limited space within the housing, there is a risk of compression and scratching between the battery cells and the housing, making installation difficult.

[0065] In the battery of the disclosed embodiment, the shell of the battery wrapping structure is no longer an integrally formed structure, but is connected by bending through multiple bending plates. During the process of installing the battery cell into the shell, the shell can be unfolded first, the battery cell can be placed on the unfolded shell, and then the bending plates of the shell can be connected to form a shell that is connected end to end in a circumferential direction.

[0066] The solutions of the embodiments of the present disclosure may be applied to, but are not limited to, batteries, battery packs including batteries, and electrical devices including battery packs.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] Referring to Figures 1 to 6 , 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 receiving space 11, and a pressure relief vent 12 connected to the receiving space 11 is formed on one side of the wrapping structure 1. The rest of the wrapping structure 1 is a sealed structure. 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 and the shell 13 enclose the receiving space 11. The shell 13 includes a plurality of bent plates 131 that are bent in sequence. The conductive terminal 2 is connected to the wrapping structure 1 and is mounted on the top cover 14. 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 accommodating space 11, the tab 31 of the battery cell 3 is electrically connected to the conductive terminal 2, and the bent plates 131 at both ends of the circumference of the battery cell 3 are connected. Multiple 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, and the top cover 14 and multiple bent plates 131 are arranged to form a accommodating space 11.

[0077] The wrapping structure 1 is a structure wrapped around the battery cell 3 , and the accommodation space 11 of the wrapping structure 1 is mainly used to accommodate the battery cell 3 .

[0078] 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 .

[0079] 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.

[0080] Exemplarily, the battery cell 3 includes a bare cell and an outer packaging covering the bare cell for protecting the bare cell. The bare cell includes a positive electrode sheet 91, a negative electrode sheet 92, and a separator 93 located between the positive electrode sheet 91 and the negative electrode sheet 92.

[0081] Exemplarily, the isolation member 93 is an isolation membrane.

[0082] A pressure relief vent 12 connected to the 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 gaps at the incompletely sealed locations of the wrapping structure 1 can, to a certain extent, suppress the eruption of thermal runaway gases from the incompletely sealed locations of the wrapping structure 1, thereby guiding the thermal runaway gases to erupt from the pressure relief vent 12.

[0083] 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.

[0084] For example, the number of battery cells 3 in the packaging structure 1 may be one or at least two.

[0085] 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.

[0086] For example, the housing 13 may be in an expanded state, the battery cell 3 may be placed on the expanded housing 13 , and then the housing 13 may be bent into a plurality of bent plates 131 and the bent plates 131 at both ends of the circumference may be connected.

[0087] For example, the bent multiple plates 131 may be appropriately expanded to a certain extent, the battery cells 3 may be placed in the appropriately expanded multiple plates 131 , and the bent plates 131 at both ends of the circumference may be connected.

[0088] In the embodiment of the present disclosure, since the shell 13 is not an integrally formed structure, before the battery cell 3 is installed into the shell 13, the shell 13 can be placed in an unfolded state or the multiple bending plates 131 of the shell 13 can be appropriately unfolded. After unfolding, the installation of the battery cell 3 is no longer limited by the internal space of the shell 13. During the process of installing the battery cell 3 into the shell 13, the battery cell 3 is almost not squeezed or scratched by the shell 13. The battery cell 3 can be installed into the shell 13 more conveniently, thereby reducing the difficulty of installation between the battery cell 3 and the shell 13.

[0089] In one embodiment, referring to Figures 4 to 6 and Figures 11 to 15, 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 in the circumferential direction are connected by welding. The positions at which the bent plates 131 at both ends of the battery cell 3 are welded are target positions, and the reinforcing plate 6 is welded to the shell 13 at the target positions.

[0090] 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 .

[0091] Exemplarily, the material of the housing 13 and the material of the reinforcing plate 6 are both metal.

[0092] Exemplarily, the thickness of the reinforcing plate 6 is 0.2 mm.

[0093] 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.

[0094] It is understood that the specific structure of the battery 100 is not limited. For example, the battery 100 may not be provided with the reinforcing plate 6.

[0095] In one embodiment, referring to FIG. 14 and FIG. 15 , among the bent plates 131 at both ends of the battery cell 3 in the circumferential direction, the reinforcing plate 6 is located on one side of the bent plates 131 facing the other bent plate 131 along the arrangement direction of the bent plates 131 and the battery cell 3 .

[0096] For example, referring to FIG. 14 and FIG. 15 , the arrangement direction of the bending plates 131 and the battery cells 3 is the direction indicated by the arrow R1 in the figure.

[0097] Exemplarily, referring to FIG. 14 and FIG. 15 , the reinforcing plate 6 is located between the bent plates 131 at both ends of the battery cell 3 along the circumferential direction along the direction indicated by the arrow R1 .

[0098] In the embodiment of the present disclosure, during the welding process, the welding stamp 8 welds through the reinforcing plate 6 so that both sides of the reinforcing plate 6 are respectively connected to the corresponding bending plates 131. The welded reinforcing plate 6 can more firmly connect the bending plates 131 on both sides.

[0099] In one embodiment, referring to FIG. 4 to FIG. 6 and FIG. 11 to FIG. 13 , the bent plates 131 at both ends of the circumference of the battery cell 3 are both located on the side of the reinforcing plate 6 away from the battery cell 3 .

[0100] For example, the weld mark 8 may penetrate the bent plates 131 at both ends of the battery cell 3 in the circumferential direction so as to better connect the bent plates 131 at both ends.

[0101] For example, the weld mark 8 formed on the reinforcing plate 6 may be located on a side of the reinforcing plate 6 facing away from the battery cell 3 .

[0102] In the embodiment of the present disclosure, the weld mark 8 can weld the bent plates 131 at both ends of the circumference together without having to weld through the reinforcing plate 6. Since the weld mark 8 does not have to weld through the reinforcing plate 6, the possibility of damaging the battery cell 3 during the welding process is reduced.

[0103] In one embodiment, referring to FIG. 6 , FIG. 13 and FIG. 15 , the package structure 1 further includes an insulating layer 15 , and the insulating layer 15 covers the inner surface of the shell 13 .

[0104] Exemplarily, the insulating layer 15 is covered on the housing 13 by hot pressing.

[0105] Exemplarily, the insulating layer 15 is applied to the housing 13 .

[0106] In the embodiment of the present disclosure, the housing 13 is generally flat in the unfolded state. The insulating layer 15 can be first placed over the unfolded housing 13, and then the housing 13 and the insulating layer 15 can be bent together. After the housing 13 is bent and formed, the insulating layer 15 already covers the inner surface of the housing 13. Covering the insulating layer 15 over the housing 13 in the unfolded state allows the insulating layer 15 to be more conveniently installed on the housing 13.

[0107] It is understood that the specific structural form of the package structure 1 is not limited. For example, the insulation layer 15 may not be provided in the package structure 1 depending on the situation.

[0108] In one embodiment, referring to Figures 11, 16 and 17, the battery 100 further includes a separator layer 7, battery cells 3 are provided on opposite sides of the separator layer 7 in the thickness direction to separate the battery cells 3 on both sides, the shell 13 is made of metal, and the bent plates 131 at both ends of the battery cell 3 in the circumferential direction are welded to form a weld mark 8, the weld mark 8 is located on one side of the separator layer 7 along a preset direction, the preset direction is perpendicular to the thickness direction of the separator layer 7, and the projection area of ​​the weld mark 8 along the preset direction is located within the projection area of ​​the separator layer 7 along the preset direction.

[0109] For example, the separator layer 7 can provide a certain buffer space for the expansion of the battery cell 3 .

[0110] Exemplarily, the separation layer 7 may have a certain buffering capacity.

[0111] For example, the separation layer 7 may have a certain heat insulation capability.

[0112] Exemplarily, the separation layer 7 may be a thermal insulation pad.

[0113] Exemplarily, the material of the separation layer 7 can be rubber or silicone.

[0114] Exemplarily, referring to FIG. 16 , the preset direction is the direction indicated by the arrow R1 in the figure.

[0115] For example, referring to FIG. 16 and FIG. 17 , the thickness direction of the separation layer 7 is the direction indicated by the arrow R2 .

[0116] In the embodiment of the present disclosure, since the projection area of ​​the weld mark 8 along the preset direction is located within the projection area of ​​the separator layer 7 along the preset direction, the weld mark 8 avoids the battery cells 3 on both sides of the separator layer 7 as much as possible, thereby reducing the possibility of damage to the battery cells 3 during the welding process.

[0117] It is understandable that there is no limitation on the arrangement of the welding mark 8. In one embodiment, the projection area of ​​the welding mark 8 along the preset direction may be partially located outside the projection area of ​​the separation layer 7 along the preset direction.

[0118] In one embodiment, referring to Figures 16 and 17, the maximum span of the weld mark 8 along the thickness direction of the separator layer 7 is a preset distance, the ratio of the thickness of the separator layer 7 to the preset distance is greater than or equal to 1.2, and the ratio of the thickness of the separator layer 7 to the preset distance is less than or equal to 3.

[0119] Exemplarily, referring to FIG. 16 and FIG. 17 , the thickness of the separation layer 7 is D3 , the preset thickness is D4 , and 1.2≤D3 / D4≤3.

[0120] Illustratively, the ratio of the thickness of the separation layer 7 to the preset distance may be 1.2, 1.3, 1.5, 1.7, 1.9, 2.0, 2.2, 2.5, 2.6, 2.8, 2.9 or 3.0.

[0121] In the disclosed embodiment, the ratio of the thickness of the separator layer 7 to the preset distance is greater than or equal to 1.2. The thickness of the separator layer 7 is sufficiently thick relative to the preset distance of the weld mark 8, allowing the weld mark 8 to be as far away as possible from the battery cells 3 on both sides of the separator layer 7, thereby reducing damage to the battery cells 3 during the welding process. A ratio of the thickness of the separator layer 7 to the preset distance is less than or equal to 3, which can limit the thickness of the separator layer 7 and, to a certain extent, helps to increase the volumetric energy density of the battery 100.

[0122] In one embodiment, referring to FIG. 16 and FIG. 17 , the ratio of the thickness of the separation layer 7 to the preset distance is greater than or equal to 1.5, and the ratio of the thickness of the separation layer 7 to the preset distance is less than or equal to 2.5.

[0123] Exemplarily, referring to FIG. 16 and FIG. 17 , the thickness of the separation layer 7 is D3 , the preset thickness is D4 , and 1.5≤D3 / D4≤2.5.

[0124] Illustratively, the ratio of the thickness of the separation layer 7 to the preset distance may be 1.5, 1.65, 1.7, 1.8, 1.9, 2.0, 2.2, 2.3 or 2.5.

[0125] In the disclosed embodiment, the ratio of the thickness of the separator layer 7 to the preset distance is greater than or equal to 1.5. The thickness of the separator layer 7 is sufficiently thick relative to the preset distance of the weld mark 8, allowing the weld mark 8 to be as far away as possible from the battery cells 3 on both sides of the separator layer 7, thereby reducing damage to the battery cells 3 during the welding process. A ratio of the thickness of the separator layer 7 to the preset distance is less than or equal to 2.5, which can limit the thickness of the separator layer 7 and, to a certain extent, helps to increase the volumetric energy density of the battery 100.

[0126] In one embodiment, referring to FIG. 16 to FIG. 19 , the thickness direction of the separator 7 is arranged to intersect with the large surface of the battery cell 3 .

[0127] The large surface of the battery cell 3 is the surface of the battery cell 3 with the largest area.

[0128] Exemplarily, the battery cell 3 includes a bare cell, which includes a positive electrode sheet 91 , a negative electrode sheet 92 and a separator 93 . The separator 93 is disposed between the positive electrode sheet 91 and the negative electrode sheet 92 to insulate the positive electrode sheet 91 from the negative electrode sheet 92 .

[0129] Exemplarily, the isolation member 93 is an isolation membrane.

[0130] Exemplarily, the positive electrode sheet 91, the negative electrode sheet 92 and the separator 93 are wound together to form a winding structure, and the bare battery cell has a straight area 94 and a corner area 95, and the corner areas 95 are arranged on opposite sides of the straight area 94. The direction in which the positive electrode sheet 91 in the straight area 94, the separator 92 in the straight area 94 and the negative electrode sheet 92 in the straight area 94 are stacked in sequence is the thickness direction of the separator 7.

[0131] Illustratively, the positive electrode sheet 91 , the separator 93 and the negative electrode sheet 92 are stacked in sequence to form a laminate structure, and the direction in which the positive electrode sheet 91 , the separator 93 and the negative electrode sheet 92 are stacked in sequence is the thickness direction of the separator layer 7 .

[0132] Exemplarily, the battery cell 3 further includes a sealing bag wrapped around the bare cell, and the sealing bag is used to seal the electrolyte so as to immerse the bare cell in the electrolyte.

[0133] Exemplarily, the sealed bag is an aluminum-plastic film.

[0134] In the embodiment of the present disclosure, since the expansion of the battery cell 3 during the charging and discharging process is mainly in the direction perpendicular to the large surface of the battery cell 3, the thickness direction of the separation layer 7 is arranged crosswise with the large surface direction of the battery cell 3, which is beneficial to provide sufficient space for the expansion of the battery cell 3, thereby better buffering the expansion of the battery cell 3.

[0135] It is understood that the thickness direction of the separator layer 7 is not limited. For example, the thickness direction of the separator layer 7 can be parallel to the large surface of the battery cell 3.

[0136] In one embodiment, the battery cell 3 is a soft-pack battery cell.

[0137] In one embodiment, the battery cells 3 are soft-pack battery cells measuring 7mm*150mm*275mm. These soft-pack battery cells are unformed, dry, bare cells, meaning electrolyte has not yet been injected into the soft-pack battery cells to reduce the possibility of thermal runaway. Battery cells 3 are positioned on opposite sides of the separator layer 7 in the thickness direction to separate the battery cells 3 on both sides. Multiple battery 100 samples are prepared, each with a separator layer 7 thickness of D3. The thickness of the separator layer 7 for each battery 100 sample is determined based on actual needs. The maximum span of the corresponding weld marks 8 along the thickness direction of the separator layer 7 for each battery 100 sample is a preset distance, D4. The preset distance of the weld marks 8 for each battery 100 sample is determined based on actual needs and can be adjusted by adjusting the welding power. The shell 13 thickness of each battery 100 sample is 0.2mm. The corresponding housing 13 of each battery 100 sample is wrapped around a separator layer 7 of corresponding thickness and a soft-pack battery cell. After welding, the housing 13 is disassembled to inspect the soft-pack battery cell inside the housing 13 for damage. For example, damage to the soft-pack battery cell surface can be determined by observing whether there are black spots on the surface of the soft-pack battery cell due to welding burns. If there are black spots on the surface of the soft-pack battery cell due to welding burns, the soft-pack battery cell is damaged. For example, gas can be injected into the soft-pack battery cell to determine whether the aluminum-plastic film of the soft-pack battery cell is leaking. If the aluminum-plastic film of the soft-pack battery cell is leaking, the soft-pack battery cell is damaged. For example, the aluminum-plastic film of the soft-pack battery cell can be disassembled to inspect the bare battery cell inside the aluminum-plastic film for black spots on the surface of the soft-pack battery cell due to welding burns. If there are black spots on the surface of the soft-pack battery cell due to welding burns, the soft-pack battery cell is not damaged. The experimental data are shown in Table 1.

[0138] Table 1

[0139] 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 housing space 11, and a pressure relief vent 12 connected to the housing 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 housing space 11, and the tab 31 of the battery cell 3 is electrically connected to the conductive terminal 2.

[0140] The wrapping structure 1 is a structure wrapped around the battery cell 3 , and the accommodation space 11 of the wrapping structure 1 is mainly used to accommodate the battery cell 3 .

[0141] 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 .

[0142] 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.

[0143] 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.

[0144] A pressure relief vent 12 connected to the 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 gaps at the incompletely sealed locations of the wrapping structure 1 can, to a certain extent, suppress the eruption of thermal runaway gases from the incompletely sealed locations of the wrapping structure 1, thereby guiding the thermal runaway gases to erupt from the pressure relief vent 12.

[0145] 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.

[0146] For example, the number of battery cells 3 in the packaging structure 1 may be one or at least two.

[0147] 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 formation of a pressure relief vent 12 on one side of the packaging structure 1, which is connected to the 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 other than 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 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.

[0148] In one embodiment, the battery cell 3 is a soft-pack battery cell.

[0149] 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.

[0150] Exemplarily, the plastic film is an aluminum-plastic film.

[0151] 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 .

[0152] 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.

[0153] 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.

[0154] 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 .

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] Exemplarily, referring to FIG. 2 and FIG. 3 , the switching electrode 21 and the sampling electrode 22 are both bars.

[0161] 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.

[0162] 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 .

[0163] Pressure bearing capacity refers to the ability to withstand fluid pressure.

[0164] 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 is located over the pressure relief port 12, the package structure 1 and the flame-retardant cover 4 essentially seal the accommodation space 11. When gas is filled into the accommodation space 11, the air pressure in the accommodation 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 accommodation space 11, the flame-retardant cover 4 breaks before the package structure 1, that is, 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.

[0165] 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.

[0166] 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 100. The flame retardant cover 4 is provided on the pressure relief port 12. In the event of thermal runaway of the adjacent battery 100, it can reduce the thermal runaway gas generated by the adjacent battery 100 from entering the 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 storage space 11, 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 storage space 11 first breaks through the flame retardant cover 4, causing the thermal runaway gas in the storage space 11 to erupt directionally from the pressure relief port 12.

[0167] In one embodiment, referring to FIG. 1 to FIG. 3 , the flame retardant cover 4 may be made of mica.

[0168] Exemplarily, the flame retardant cover 4 is mica paper.

[0169] Exemplarily, the mica paper is bonded to the wrapping structure 1 .

[0170] 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.

[0171] In one embodiment, referring to FIG. 1 , the flame retardant cover 4 may be formed with notches 41 .

[0172] 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 .

[0173] 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 accommodating space 11 of the wrapping structure 1, the thermal runaway gas in the accommodating space 11 is facilitated to break through the flame retardant cover 4 and eject from the pressure relief port 12.

[0174] In one embodiment, referring to FIG. 1 , the flame retardant cover 4 is formed with a through hole 42 communicating with the accommodating space 11 .

[0175] The through hole 42 on the flame retardant cover 4 passes through the flame retardant cover 4 .

[0176] In the embodiment of the present disclosure, part of the structure within the accommodating space 11 of the wrapping structure 1 needs to extend out of the accommodating space 11. This part of the structure extends out of the 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 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.

[0177] In one embodiment, referring to Figures 3, 7 and 8, the battery 100 further includes a temperature-regulating container 5 partially located within the accommodating 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 accommodating space 11 along the side of the wrapping structure 1 toward the flame-retardant cover 4.

[0178] 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.

[0179] Exemplarily, the fluid flowing through the temperature regulating chamber 51 of the temperature regulating container 5 may be liquid or gas.

[0180] Exemplarily, liquid or gas with a relatively low temperature is introduced into the temperature regulating chamber 51 to cool the battery cells 3 .

[0181] Exemplarily, the temperature control container 5 may be an air bag.

[0182] For example, the material of the airbag may be rubber.

[0183] For example, referring to FIG. 3 and FIG. 7 , battery cells 3 are disposed on opposite sides of the temperature regulating container 5 .

[0184] 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 .

[0185] For example, referring to FIG. 7 , the number of battery cells 3 on each side is one.

[0186] 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 .

[0187] In the disclosed embodiment, the inlet 52 and outlet 53 of the temperature-regulating container 5 extend outside the 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 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.

[0188] It is understandable that what extends out of the accommodating space 11 of the wrapping structure 1 from the through hole 42 of the flame retardant cover 4 is not necessarily the temperature regulating container 5 , but may also be other structures partially located in the accommodating space 11 of the wrapping structure 1 depending on the circumstances.

[0189] 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.

[0190] The container body 54 is mainly used to accommodate a fluid whose temperature can be adjusted.

[0191] 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 .

[0192] 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 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.

[0193] 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.

[0194] 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.

[0195] For example, the ignition point of the flame retardant cover 4 may be 800° C., 810° C., 860° C., or 900° C., etc.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] 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 receiving space 11 , and the conductive terminal 2 is mounted on the top cover 14 .

[0200] Exemplarily, the mica paper is bonded to the housing 13 .

[0201] 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.

[0202] 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.

[0203] 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.

[0204] 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.

[0205] 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.

[0206] 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.

[0207] 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.

[0208] 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 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.

[0209] 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 receiving space 11. The wrapping structure 1 also includes an insulating layer 15, which covers the inner surface of the shell 13.

[0210] 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.

[0211] Exemplarily, the insulating layer 15 is covered on the housing 13 by hot pressing.

[0212] Exemplarily, the insulating layer 15 is applied to the housing 13 .

[0213] In the embodiment of the present disclosure, the housing 13 is generally flat in the unfolded state. The insulating layer 15 can be first placed over the unfolded housing 13, and then the housing 13 and the insulating layer 15 can be bent together. After the housing 13 is bent and formed, the insulating layer 15 already covers the inner surface of the housing 13. Covering the insulating layer 15 over the housing 13 in the unfolded state allows the insulating layer 15 to be more conveniently installed on the housing 13.

[0214] 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.

[0215] 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 .

[0216] Exemplarily, the material of the housing 13 and the material of the reinforcing plate 6 are both metal.

[0217] Exemplarily, the bent plates 131 at both ends of the battery cell 3 in the circumferential direction are connected by welding, and the welding method is laser welding.

[0218] 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.

[0219] 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.

[0220] For example, referring to FIG. 6 , the thickness of the housing 13 is D2 , and 0.1 mm ≤ D2 ≤ 1 mm.

[0221] 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.

[0222] 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.

[0223] 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.

[0224] For example, referring to FIG. 6 , the thickness of the housing 13 is D2 , 1 mm ≤ D2 ≤ 3 mm.

[0225] 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] Exemplarily, the shell 13 may be made of metal such as steel, aluminum, aluminum alloy, copper or copper alloy.

[0230] Illustratively, the aluminum alloy may be an aluminum-magnesium alloy.

[0231] For example, the top cover 14 may be made of engineering plastics such as polypropylene or polyethylene.

[0232] 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.

[0233] 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.

[0234] 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 .

[0235] 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.

[0236] 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 .

[0237] 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.

[0238] 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.

[0239] 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 accommodating space 11 in four directions corresponding to the accommodating space 11. The top cover 14 is mounted on the housing 13 and blocks the accommodating space 11 in the direction from the accommodating space 11 toward the top cover 14. That is, the housing 13 and the top cover 14 block the accommodating space 11 in five directions. The battery cell 3 is mounted in 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 gases generated by the thermal runaway and the substances carried by the gases are ejected from the mica paper at the pressure relief vent 12, thereby achieving directional ejection of the soft-pack battery cell. The housing 13, the top cover 14 and the accommodating space 11 sealed by the mica paper do not need to be completely sealed, as long as they can guide the directional eruption of the gas generated by thermal runaway. The mica paper is bonded to the housing 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 housing 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 accommodating 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 housing 13 can be connected in various forms such as bonding, hot pressing or welding. The top cover 14 and the housing 13 do not need to be completely sealed. A gap of less than or equal to 0.5 mm can be provided between the top cover 14 and the housing 13, or other structures can be provided to suppress the eruption of thermal runaway gases from between the housing 13 and the top cover 14 to a certain extent. The housing 13 contains soft-pack battery cells. Other structures other than soft-pack battery cells can also be placed in the housing 13. The number of battery cells in the housing 13 is greater than or equal to 1 and less than or equal to 4. The housing 13 is a metal housing 13 with a thickness of 0.1 mm to 1 mm. The interior of the housing 13 is sprayed with an insulating coating or a hot-pressed insulating layer 15. The battery 100 also includes a separator layer 7. Battery cells 3 are disposed on opposite sides of the separator layer 7 in the thickness direction to separate the battery cells 3 on both sides. The housing 13 is made of metal. Bent plates 131 at both circumferential ends of the battery cells 3 are welded to form weld marks 8. Weld marks 8 are located on one side of the separator layer 7 along a predetermined direction, which is perpendicular to the thickness direction of the separator layer 7. The projection of weld marks 8 along the predetermined direction is located within the projection of the separator layer 7 along the predetermined direction. The maximum span of weld marks 8 along the thickness direction of the separator layer 7 is a predetermined distance. The ratio of the thickness of the separator layer 7 to the predetermined distance is greater than or equal to 1.2, and the ratio of the thickness of the separator layer 7 to the predetermined distance is less than or equal to 3.

[0240] 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.

[0241] For example, the two parts of the shell 13 may be welded into the annular shell 13 through two welds at different positions.

[0242] For example, the housing 13 may be formed in one piece without welding.

[0243] 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.

[0244] 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.

[0245] The foregoing description is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. A battery comprising: A wrapping structure forms an accommodating space, a pressure relief port connected to the accommodating space is formed on one side of the wrapping structure, and the rest of the wrapping structure is a sealing structure. The wrapping structure includes a shell and a top cover, the pressure relief port is formed on one side of the shell, the top cover and the shell enclose the accommodating space, and the shell includes a plurality of bent plates that are bent in sequence; a conductive terminal connected to the package structure, the conductive terminal being mounted on the top cover, the conductive terminal and the pressure relief port being located on different sides of the package structure; A battery cell is located in the accommodating space, the tabs of the battery cell are electrically connected to the conductive terminals, the bent plates at both ends of the circumference of the battery cell are connected, and multiple bent plates are arranged to form the pressure relief port. The top cover and the pressure relief port are respectively located on opposite sides of the shell, and the top cover and multiple bent plates are arranged to form the accommodating space.

2. The battery according to claim 1, wherein The shell is made of metal, and the battery also includes a reinforcing plate, which is located on the inner surface of the shell. The bent plates at both ends of the battery cell are connected by welding. The welding positions of the bent plates at both ends of the battery cell are target positions, and the reinforcing plate is welded to the shell at the target position.

3. The battery according to claim 2, wherein The reinforcing plate is located between the bent plates at both ends of the battery cell in the circumferential direction.

4. The battery according to claim 2, wherein The bent plates at both ends of the battery cell in the circumferential direction are both located on a side of the reinforcing plate away from the battery cell.

5. The battery according to any one of claims 1 to 4, wherein The packaging structure further includes an insulating layer, which covers the inner surface of the shell.

6. The battery according to any one of claims 1 to 5, wherein The battery also includes a separator layer, and the battery cells are arranged on opposite sides of the separator layer in the thickness direction to separate the battery cells on both sides. The shell is made of metal, and the bent plates at both ends of the battery cell are welded to form a weld mark. The weld mark is located on one side of the separator layer along a preset direction, and the preset direction is perpendicular to the thickness direction of the separator layer. The projection area of ​​the weld mark along the preset direction is located within the projection area of ​​the separator layer along the preset direction.

7. The battery according to claim 6, wherein The maximum span of the weld mark along the thickness direction of the separator layer is a preset distance, the ratio of the thickness of the separator layer to the preset distance is greater than or equal to 1.2, and the ratio of the thickness of the separator layer to the preset distance is less than or equal to 3.

8. The battery according to claim 7, wherein The ratio of the thickness of the separation layer to the preset distance is greater than or equal to 1.5, and the ratio of the thickness of the separation layer to the preset distance is less than or equal to 2.

5.

9. The battery according to any one of claims 5 to 8, wherein The thickness direction of the separation layer is arranged to intersect with the large surface of the battery cell.

10. The battery according to any one of claims 1 to 9, wherein The battery cell is a soft-pack battery cell.

11. A battery pack, wherein: include: Box; The battery according to any one of claims 1 to 10, located in the box.

12. An electrical device, wherein: include: Device body; The battery pack according to claim 11, mounted on the device body to supply power to the device body.

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