Battery pack and electric device

Abstract

The disclosure belongs to the technical field of batteries. Provided in the embodiments of the present application are a battery pack and an electric device. Each battery unit is provided with a pressure relief port, and each battery unit comprises at least one battery cell. An accommodating space is formed in a box body; the battery unit is located in the accommodating space; the box body comprises a main box and a box cover; the accommodating space is formed in the main box; a first protruding portion is formed on the side of the main box facing the box cover; and the box cover covers the accommodating space of the main box, and the box cover is provided with a sealing portion, the sealing portion being in contact with the main box in a sealing manner in the arrangement direction of the main box and the box cover, and the sealing portion being located on the side of the first protruding portion away from the battery unit. Ejections caused by thermal runaway are shielded by means of the first protruding portion, such that the possibility of sealing failure between the sealing portion and the main box due to damage to the sealing portion is reduced.

Description

Battery pack and power-consuming device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on Chinese patent application number 202410254542.5, application date March 6, 2024, and invention name “A battery pack, battery module, battery cell and electrical device”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this disclosure as a reference. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular to 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 cells of the battery pack are installed in the box, and the battery cells in the box are charged to store energy or discharged to supply power. In the related art, the seal between the main box and the box cover of the battery pack may fail. Summary of the Invention

[0006] In view of this, embodiments of the present disclosure are intended to provide a battery pack and an electrical device, aiming to reduce the possibility of sealing failure between the main box and the box cover.

[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 pack, comprising:

[0009] At least one battery unit, each of the battery units having a pressure relief port, and each of the battery units including at least one battery cell;

[0010] A box body has a storage space formed therein, and the battery cell is located in the storage space. The box body includes a main box and a box cover. The storage space is formed in the main box. A first protrusion is formed on the side of the main box facing the box cover. The box cover is arranged in the storage space of the main box. The box cover has a sealing part. The sealing part is in contact and sealed with the main box along the arrangement direction of the main box and the box cover. The sealing part is located on the side of the first protrusion facing away from the battery cell.

[0011] In the disclosed embodiment, the seal between the cover and the main case is achieved by the sealing portion of the cover sealingly contacting the main case along the alignment direction of the main case and the cover. When a battery cell within the storage space experiences thermal runaway, the resulting ejecta ejected from the pressure relief vent of the battery cell. Because the sealing portion is located on the side of the first protrusion facing away from the battery cell, the sealing portion is shielded by the first protrusion. The thermal runaway ejecta ejected from the pressure relief vent toward the sealing portion is blocked by the first protrusion. This reduces the possibility of the thermal runaway ejecta ejected from the pressure relief vent toward the sealing portion damaging the seal between the sealing portion and the main case, thereby reducing the possibility of seal failure between the sealing portion and the main case.

[0012] In some embodiments, a second protrusion is formed on a side of the main box facing the box cover, the second protrusion is located on a side of the first protrusion away from the accommodating space, and the sealing portion is provided between the first protrusion and the second protrusion.

[0013] In the disclosed embodiment, a case cover is provided over the main case's storage space, sealing the battery cells within the storage space within the case. The case cover, near the sealing portion, forms a multi-curved flow channel with the first and second protruding portions of the main case. This multi-curved flow channel creates significant resistance to fluid flow, effectively suppressing the escape of thermal runaway gases within the main case's storage space from between the main case and the case cover, resulting in a strong seal between the main case and the case cover.

[0014] In some embodiments, the sealing portion has a first sealing surface, and the main box includes:

[0015] a box body, wherein the accommodating space, the first protrusion, and the second protrusion are all formed in the box body, the box body having a second sealing surface located between the first protrusion and the second protrusion, and the second sealing surface is located on a side of the recessed space between the first protrusion and the second protrusion facing away from the box cover;

[0016] A sealing medium is located in the recessed space between the first protruding portion and the second protruding portion, and the sealing medium contacts and seals the first sealing surface and the second sealing surface respectively.

[0017] In the embodiment of the present disclosure, the sealing medium is located in the recessed space between the first protrusion and the second protrusion, so that the sealing medium can be better protected by the first protrusion and the second protrusion on both sides, thereby reducing the possibility of the sealing medium being damaged, and enabling the sealing medium to better seal the first sealing surface of the sealing part and the second sealing surface of the box body.

[0018] In some embodiments, the sealing portion has a weight-reducing empty area on the side facing away from the main box, and the box cover also has an avoidance platform, and the avoidance platform has an avoidance empty area on the side facing the main box. The avoidance platform and the sealing portion are alternately arranged along the arrangement direction of the first protrusion and the second protrusion, and the first protrusion and the second protrusion are respectively located in the corresponding avoidance empty areas.

[0019] In the embodiment of the present disclosure, the avoidance platform and the sealing portion are alternately arranged along the arrangement direction of the first protrusion and the second protrusion, so that the box cover forms a wave-like structure at the approximate position where it is connected to the main box, that is, it can better avoid to adapt to the first protrusion and the second protrusion on the main box and can also play a role in reducing weight. The sealing portion that sinks into the recessed space between the first protrusion and the second protrusion can better seal with the main box.

[0020] In some embodiments, a sealing portion is provided on a side of the second protrusion facing away from the first protrusion, and the sealing portion is connected to the main box.

[0021] In the disclosed embodiment, the connection to the main case is achieved through the sealing portion on the side of the second protrusion facing away from the first protrusion, allowing the portion of the case cover connected to the main case to avoid the sealing portion between the case cover and the main case between the first and second protrusions, thereby reducing the possibility of damage to the seal between the case cover and the main case caused by the connection between the sealing portion and the main case. Furthermore, because the connection to the main case is achieved through the sealing portion on the side of the second protrusion facing away from the first protrusion, thermal runaway ejecta within the containment space can be effectively sealed within the containment space through the sealing portion between the first and second protrusions, thereby reducing the possibility of thermal runaway ejecta escaping through the sealing portion on the side of the second protrusion facing away from the first protrusion.

[0022] In some embodiments, the battery pack further includes a connector, which is connected to the sealing portion and the main box respectively, and the connector is located on a side of the second protrusion facing away from the first protrusion.

[0023] In the disclosed embodiment, the connector connecting the sealing portion and the main housing is located on the side of the second protrusion facing away from the first protrusion, minimizing damage to the sealing structure between the first and second protrusions caused by the connector. The connector connects the sealing portion to the main housing, potentially leaving gaps between the sealing portion and the connector, as well as between the main housing and the connector. However, the location of the connector on the side of the second protrusion facing away from the first protrusion reduces the possibility of ejecta from the containment space in the event of thermal runaway escaping beyond the connector's location.

[0024] In some embodiments, the main box is made of a carbon fiber woven composite material, and the box cover is made of a carbon fiber woven composite material.

[0025] In the embodiment of the present disclosure, the carbon fiber woven composite material has good strength, heat resistance and impact resistance, and the main box and box cover made of the carbon fiber woven material correspondingly have good strength, heat resistance and impact resistance.

[0026] In some embodiments, the pressure relief port is located on one side of the battery cell along a preset direction, the arrangement direction of the main box and the box cover are arranged crosswise to the preset direction, and the sealing portion is located on the side of the pressure relief port along the main box pointing to the box cover.

[0027] In the embodiment of the present disclosure, the sealing portion is located on the side of the pressure relief port along the main box pointing toward the box cover, and the sealing portion is offset toward the side of the pressure relief port toward the box cover, so that the sealing portion and the box cover can avoid the pressure relief port of the battery cell as much as possible, thereby reducing the risk of ejecta generated by the pressure relief port in the event of thermal runaway damaging the sealing portion and the box cover.

[0028] In some embodiments, when projected along the preset direction, the projected area of ​​the sealing portion and the projected area of ​​the pressure relief port are arranged at intervals.

[0029] In the embodiment of the present disclosure, the projection area of ​​the sealing portion and the projection area of ​​the pressure relief port are arranged at intervals, so that the sealing portion and the pressure relief port are almost staggered, which is beneficial to reducing the possibility of the ejecta caused by thermal runaway of the pressure relief port damaging the sealing portion.

[0030] In some embodiments, the battery unit further includes a pressure relief mechanism covering the pressure relief port, and the pressure relief mechanism is used to open or close the pressure relief port.

[0031] In the disclosed embodiment, a pressure relief mechanism covers the pressure relief opening. This effectively shields the pressure relief opening, reducing the possibility of structures within the battery cell moving out of the opening. Furthermore, it also inhibits the possibility of external objects entering the pressure relief opening and interfering with the structures within the battery cell. Opening the pressure relief opening through the pressure relief mechanism also relieves pressure within the battery cell.

[0032] In some embodiments, the pressure relief mechanism is a flame retardant cover.

[0033] In some embodiments, the box cover is located above the main box.

[0034] In some embodiments, the battery cell is a soft-pack battery cell, and each of the battery cells further includes a shell, a battery cell cavity is formed in the shell, and the at least one soft-pack battery cell is arranged in the battery cell cavity. At least one side of the shell is provided with an electrode assembly for electrical connection to other structures, and at least one side of the shell is provided with the pressure relief port for pressure relief, and the electrode assembly and the pressure relief port are located on different sides of the shell.

[0035] In the disclosed embodiments, in the event of thermal runaway in a soft-pack battery cell, the thermal runaway gas within the cell cavity is ejected from the pressure relief vent under the guidance of the outer shell, 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 outer shell toward the pressure relief vent. The electrode assembly and the pressure relief vent are located on different sides of the outer shell, allowing the thermal runaway gas ejected from the pressure relief vent to avoid the electrode assembly as much as possible.

[0036] A second aspect of an embodiment of the present application provides an electrical device, including:

[0037] Device body;

[0038] Any of the above-mentioned battery packs is installed in the device body to supply power to the device body.

[0039] The battery pack provided in the disclosed embodiments achieves a seal between the cover and the main case by sealing the cover's sealing portion against the main case along the alignment of the main case and the cover. When a battery cell within the storage space experiences thermal runaway, the resulting ejecta ejected from the pressure relief vent of the battery cell. Because the sealing portion is located on the side of the first protrusion facing away from the battery cell, the sealing portion is shielded by the first protrusion. The thermal runaway ejecta ejected from the pressure relief vent toward the sealing portion is blocked by the first protrusion. This reduces the possibility of the thermal runaway ejecta ejected from the pressure relief vent toward the sealing portion damaging the seal between the sealing portion and the main case, thereby reducing the possibility of seal failure between the sealing portion and the main case. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] FIG1 is a schematic structural diagram of a battery pack according to an embodiment of the present application, showing an insulating layer but not a cover;

[0041] FIG2 is an exploded schematic diagram of a battery pack according to an embodiment of the present application, wherein the box cover is not shown;

[0042] FIG3 is a schematic structural diagram of the main box according to an embodiment of the present application;

[0043] FIG4 is a schematic structural diagram of a battery pack according to an embodiment of the present application, showing a box cover;

[0044] FIG5 is a schematic structural diagram of a battery pack according to an embodiment of the present application, showing the cross-sectional position of the battery pack;

[0045] FIG6 is a cross-sectional view at position AA in FIG5;

[0046] FIG7 is an enlarged view of position B in FIG6;

[0047] FIG8 is a schematic structural diagram of a battery cell according to an embodiment of the present application, in which the electrode assembly is not shown;

[0048] FIG9 is a schematic structural diagram of a battery cell according to an embodiment of the present application, showing an electrode assembly;

[0049] FIG10 is an exploded schematic diagram of a battery unit according to an embodiment of the present application;

[0050] FIG11 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 application;

[0051] FIG12 is an assembly diagram of the top cover and the main shell of an embodiment of the present application, showing the gap between the flange of the top cover and the side wall of the main shell;

[0052] FIG. 13 is an enlarged view of position C in FIG. 7 .

[0053] DESCRIPTION OF REFERENCE NUMERALS 1. Box body; 11. Accommodating space; 12. Target side wall; 121. Exhaust flow channel; 122. Exhaust hole; 123. Wall body; 124. Reinforcement rib; 125. Weight reduction cavity; 13. Main box; 131. First protrusion; 132. Second protrusion; 14. Box cover; 141. Sealing portion; 21. Outer shell; 211. Cell cavity; 212. Pressure relief vent; 213. Main shell; 214. Top cover; 2141. Flanged edge; 22. Pouch cell; 221. Tab; 23. Electrode assembly; 231. Sampling electrode; 232. Transfer electrode; 24. Flame-retardant cover; 241. Through hole; 25. Temperature control container; 251. Inlet; 252. Outlet; 201. First battery cell; 202. Second battery cell; 3. Insulation layer; 4. Battery module; 5. Explosion-proof valve; 142. First sealing surface; 143. Weight-reducing space; 144. Avoidance platform; 145. Avoidance space; 133. Box body; 134. Sealing medium; 135. Second sealing surface; 136. Third protrusion; 6. Connector. DETAILED DESCRIPTION

[0054] The following embodiments of the technical solution of the present application will be 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 application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0055] 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 application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" in the embodiments of this application and any variations thereof are intended to cover non-exclusive inclusions.

[0056] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc. are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0057] 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 application. 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.

[0058] In the description of the embodiments of this application, 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 the following 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.

[0059] In the description of the embodiments of the present application, 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; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0060] In the description of the embodiments of the present application, 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.

[0061] In the related art, the battery unit is located in a box body, and the battery cell is protected by the box body. When the battery cell in the battery unit experiences thermal runaway, the ejecta generated by the thermal runaway of the battery cell may spray toward the sealing position between the main box and the box cover of the box body, causing the seal between the main box and the box cover to fail.

[0062] In the embodiment of the present application, the first protrusion of the main box is arranged on the box cover so that the sealing portion for sealing with the main box faces the battery cell, that is, the sealing portion is located on the side of the first protrusion away from the battery cell, so that the sprayed material sprayed toward the sealing position of the main box and the box cover corresponding to the sealing portion can be blocked by the first protrusion as much as possible, thereby reducing the possibility of sealing failure at the sealing position of the main box and the box cover corresponding to the sealing portion of the box cover.

[0063] The battery unit provided in the embodiments of the present application can be used, but is not limited to, in electrical devices such as energy storage power supply systems, vehicles, ships, or aircraft.

[0064] The battery cells provided in the embodiments of the present application 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.

[0065] 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.

[0066] A battery cell refers to the basic unit that can realize the mutual conversion of chemical energy and electrical energy.

[0067] In the embodiment of the present application, 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.

[0068] In the embodiment of the present application, the battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiment of the present application is not limited to this.

[0069] The embodiments of the present application provide an electrical device including the above-mentioned battery unit 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.

[0070] The power-consuming device of the embodiment of the present application 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.

[0071] In the embodiment of the present application, power is supplied to the device body by the battery pack, so that the device body obtains the electrical energy required to maintain normal operation.

[0072] The battery pack of the embodiment of the present application, please refer to Figures 1 to 7, includes a case 1 and at least one battery cell. Each battery cell has a pressure relief port 212, and each battery cell includes at least one battery cell. A storage space 11 is formed inside the case 1, and the battery cell is located in the storage space 11. The case 1 includes a main case 13 and a case cover 14. The storage space 11 is formed in the main case 13. A first protrusion 131 is formed on the side of the main case 13 facing the case cover 14. The case cover 14 is arranged to cover the storage space 11 of the main case 13. The case cover 14 has a sealing portion 141. The sealing portion 141 is in contact and sealed with the main case 13 along the arrangement direction of the main case 13 and the case cover 14.

[0073] For example, referring to FIG. 1 to FIG. 7 , the sealing portion is located on a side of the first protrusion facing away from the battery cell.

[0074] The accommodating space 11 of the box body 1 is used to accommodate the battery unit.

[0075] For example, referring to FIG. 2 , FIG. 3 and FIG. 6 , the number of the accommodating space 11 may be one.

[0076] Exemplarily, the number of the accommodating spaces 11 may be at least two.

[0077] The accommodating space 11 is formed in the main box 13 , and side walls of the accommodating space 11 are formed on the main box 13 .

[0078] For example, referring to FIG. 6 , the arrangement direction of the main box 13 and the box cover 14 is the direction indicated by the arrow R3 in the figure.

[0079] Exemplarily, the first protrusion 131 is arranged to extend along the circumference of the accommodation space 11 .

[0080] Exemplarily, the first protrusion 131 is located above the main box 13 .

[0081] In the embodiment of the present application, the seal between the case cover 14 and the main case 13 is achieved by the sealing portion 141 of the case cover 14 sealingly contacting the main case 13 along the arrangement direction of the main case 13 and the case cover 14. When a battery cell within the accommodating space 11 experiences thermal runaway, the ejecta from the thermal runaway are ejected from the pressure relief vent 212 of the battery cell. Since the sealing portion 141 is located on the side of the first protrusion 131 facing away from the battery cell, the sealing portion 141 is shielded by the first protrusion 131. The ejecta from the thermal runaway ejecta ejected from the pressure relief vent 212 toward the sealing portion 141 are blocked by the first protrusion 131. This reduces the possibility that the thermal runaway ejecta ejected from the pressure relief vent 212 toward the sealing portion 141 will damage the seal between the sealing portion 141 and the main case 13, thereby reducing the possibility of the seal between the sealing portion 141 and the main case 13 failing.

[0082] In some embodiments, referring to Figures 1 to 7 and Figure 13, a second protrusion 132 is formed on the side of the main box 13 facing the box cover 14, and the second protrusion 132 is located on the side of the first protrusion 131 away from the accommodating space 11, and a sealing portion 141 is provided between the first protrusion 131 and the second protrusion 132.

[0083] Exemplarily, the first protrusion 131 and the second protrusion 132 are arranged to extend along the circumference of the accommodation space 11 .

[0084] In the embodiment of the present application, a case cover 14 is provided over the storage space 11 of the main case 13, thereby sealing the battery cells within the storage space 11 within the case body 1. The case cover 14, near the sealing portion 141, forms a multi-curved flow channel structure with the first protrusion 131 and the second protrusion 132 of the main case 13. This multi-curved flow channel structure creates greater resistance to fluid flow, thus effectively preventing thermal runaway gases within the storage space 11 of the main case 13 from escaping from between the main case 13 and the case cover 14, thereby achieving a good seal between the main case 13 and the case cover 14.

[0085] It is understandable that the structure of the main box 13 is not limited. For example, the main box 13 may not be provided with the second protrusion 132.

[0086] In some embodiments, referring to Figures 6, 7, and 13, the sealing portion 141 has a first sealing surface 142, and the main box 13 includes a box body 133 and a sealing medium 134. The accommodating space 11, the first protrusion 131, and the second protrusion 132 are all formed in the box body 133. The box body 133 has a second sealing surface 135 located between the first protrusion 131 and the second protrusion 132. The second sealing surface 135 is located on the side of the recessed space between the first protrusion 131 and the second protrusion 132 facing away from the box cover 14. The sealing medium 134 is located in the recessed space between the first protrusion 131 and the second protrusion 132, and the sealing medium 134 contacts and seals with the first sealing surface 142 and the second sealing surface 135, respectively.

[0087] The sealing medium 134 is a structure for better contact with the first sealing surface 142 and the second sealing surface 135 so as to achieve better sealing between the first sealing surface 142 and the second sealing surface 135 .

[0088] For example, the sealing medium 134 may be a sealing pad. For example, the sealing medium 134 may be a silicone pad or a rubber pad. For example, the sealing medium 134 may be a sealant.

[0089] The box body 133 is a structure mainly for accommodating battery cells.

[0090] In the embodiment of the present application, the sealing medium 134 is located in the recessed space between the first protrusion 131 and the second protrusion 132, so that the sealing medium 134 can be better protected by the first protrusion 131 and the second protrusion 132 on both sides, thereby reducing the possibility of the sealing medium 134 being damaged, so that the sealing medium 134 can better seal the first sealing surface 142 of the sealing part 141 and the second sealing surface 135 of the box body 133.

[0091] It is understood that the specific sealing structure between the main box 13 and the box cover 14 is not limited. For example, the main box 13 may not be provided with a sealing medium 134, and the first sealing surface 142 and the second sealing surface 135 are in contact with each other to achieve sealing.

[0092] In some embodiments, referring to Figures 6, 7 and 13, the sealing portion 141 has a weight-reducing space 143 on the side facing away from the main box 13, and the box cover 14 also has a avoidance platform 144, and the avoidance platform 144 has a avoidance space 145 on the side facing the main box 13. The avoidance platform 144 and the sealing portion 141 are alternately arranged along the arrangement direction of the first protrusion 131 and the second protrusion 132, and the first protrusion 131 and the second protrusion 132 are respectively located in the corresponding avoidance space 145.

[0093] The weight-reducing empty area 143 is the empty area on the side of the sealing portion 141 away from the main box 13. Leaving this area empty does not affect the sealing performance, but can also reduce the weight to a certain extent, which is beneficial to improving the mass energy density of the battery pack.

[0094] The avoidance space 145 of the avoidance platform 144 can accommodate the first protrusion 131 and the second protrusion 132 , thereby playing a role of avoiding the first protrusion 131 and the second protrusion 132 .

[0095] In the embodiment of the present application, the avoidance platform 144 and the sealing portion 141 are alternately arranged along the arrangement direction of the first protrusion 131 and the second protrusion 132, so that the box cover 14 forms a wave-like structure at the approximate position where it is connected to the main box 13, that is, it can better avoid to adapt to the first protrusion 131 and the second protrusion 132 on the main box 13 and can also play a role in reducing weight. The sealing portion 141 that sinks into the recessed space between the first protrusion 131 and the first protrusion 131 can better seal with the main box 13.

[0096] It is understood that the specific structure of the box cover 14 is not limited. For example, the side of the sealing portion 141 facing away from the main box 13 may not be provided with the weight-reducing empty area 143.

[0097] In some embodiments, referring to FIG. 6 , FIG. 7 and FIG. 13 , a sealing portion 141 is provided on a side of the second protrusion 132 facing away from the first protrusion 131 , and the sealing portion 141 is connected to the main box 13 .

[0098] In the embodiment of the present application, the connection between the cover 14 and the main tank 13 is achieved by connecting the cover 14 to the main tank 13 via the sealing portion 141 on the side of the second protrusion 132 facing away from the first protrusion 131. This allows the portion of the cover 14 connected to the main tank 13 to avoid the sealing portion 141 between the cover 14 and the main tank 13 at the first protrusion 131 and the second protrusion 132, thereby reducing the possibility that the connection between the sealing portion 141 and the main tank 13 will damage the seal between the cover 14 and the main tank 13 at the first protrusion 131 and the second protrusion 132. Furthermore, because the connection between the cover 14 and the main tank 13 is achieved via the sealing portion 141 on the side of the second protrusion 132 facing away from the first protrusion 131, the eruption of thermal runaway within the accommodating space 11 can be effectively sealed within the accommodating space 11 through the sealing portion 141 between the first protrusion 131 and the second protrusion 132, thereby reducing the possibility of the eruption of thermal runaway from escaping through the sealing portion 141 on the side of the second protrusion 132 facing away from the first protrusion 131.

[0099] It is understood that the connection method between the main box 13 and the box cover 14 is not limited. For example, the connection position between the main box 13 and the box cover 14 can be located on the side of the first protrusion 131 facing away from the second protrusion 132, that is, the connection position between the main box 13 and the box cover 14 can be located on the side of the first protrusion 131 facing the battery cell.

[0100] In some embodiments, referring to Figures 6, 7 and 13, the battery pack further includes a connector 6, which is connected to the sealing portion 141 and the main box 13 respectively, and is located on a side of the second protrusion 132 away from the first protrusion 131.

[0101] The connecting member 6 is a structure used to connect at least two components.

[0102] Exemplarily, the connecting member 6 may be a bolt, a stud, a rivet or a screw, etc.

[0103] In the embodiment of the present application, the connector 6 connecting the sealing portion 141 and the main case 13 is located on the side of the second protrusion 132 facing away from the first protrusion 131, thereby reducing damage to the sealing structure between the first protrusion 131 and the second protrusion 132 caused by the connector 6. The connector 6 connects the sealing portion 141 and the main case 13, and gaps may exist between the sealing portion 141 and the connector 6, as well as between the main case 13 and the connector 6. However, since the connector 6 is located on the side of the second protrusion 132 facing away from the first protrusion 131, the possibility of ejected materials in the event of thermal runaway within the storage space 11 escaping beyond the location of the connector 6 is reduced.

[0104] It is understandable that there is no limitation on the connection method between the sealing portion 141 and the main box 13. For example, the sealing portion 141 and the main box 13 are welded.

[0105] In some embodiments, the main box 13 is made of a carbon fiber woven composite material, and the box cover 14 is made of a carbon fiber woven composite material.

[0106] In the embodiment of the present application, the carbon fiber woven composite material has good strength, heat resistance and impact resistance. The main box 13 and the box cover 14 made of carbon fiber woven material correspondingly have good strength, heat resistance and impact resistance.

[0107] In some embodiments, referring to Figures 2, 4, 6 and 7, the pressure relief port 212 is located on one side of the battery cell along a preset direction, the arrangement direction of the main box 13 and the box cover 14 are arranged crosswise to the preset direction, and the sealing portion 141 is located on the side of the pressure relief port 212 along the main box 13 pointing to the box cover 14.

[0108] The arrangement direction of the main tank 13 and the tank cover 14 and the preset direction are arranged in a cross-arrangement, that is, the pressure relief direction of the pressure relief port 212 and the arrangement direction of the main tank 13 and the tank cover 14 are arranged in a cross-arrangement. This facilitates the discharge of ejecta generated by the pressure relief port 212 in the event of thermal runaway through the space within the side wall of the main tank 13.

[0109] In the embodiment of the present application, the sealing portion 141 is located on the side of the pressure relief port 212 along the main box 13 pointing to the box cover 14, and the sealing portion 141 is offset toward the side of the pressure relief port 212 toward the box cover 14, so that the sealing portion 141 and the box cover 14 can avoid the pressure relief port 212 of the battery cell as much as possible, thereby reducing the risk of ejecta generated by the pressure relief port 212 in the event of thermal runaway damaging the sealing portion 141 and the box cover 14.

[0110] It is understood that the relative position of the sealing portion 141 and the pressure relief port 212 is not limited. For example, the sealing portion 141 can be located near the center of the pressure relief port 212 along the arrangement direction of the main box 13 and the box cover 14.

[0111] In some embodiments, when projected along a preset direction, the projected area of ​​the sealing portion 141 and the projected area of ​​the pressure relief port 212 are spaced apart.

[0112] Exemplarily, a projection area of ​​the sealing portion 141 along a preset direction is above a projection area of ​​the pressure relief port 212 along the preset direction and is arranged at an interval.

[0113] In the embodiment of the present application, the projection area of ​​the sealing portion 141 and the projection area of ​​the pressure relief port 212 are arranged at intervals, so that the sealing portion 141 and the pressure relief port 212 are almost staggered, which is beneficial to reducing the possibility of the ejecta caused by thermal runaway of the pressure relief port 212 damaging the sealing portion 141.

[0114] In some embodiments, referring to FIG. 2 , FIG. 8 and FIG. 9 , the battery unit further includes a pressure relief mechanism covering the pressure relief port 212 , and the pressure relief mechanism is used to open or close the pressure relief port 212 .

[0115] The pressure relief mechanism is a structure that can open the pressure relief port 212 to relieve pressure in the space within the battery unit and cover the pressure relief port 212 .

[0116] In the embodiment of the present application, the pressure relief mechanism covers the pressure relief vent 212. The pressure relief mechanism effectively shields the pressure relief vent 212, reducing the possibility of the structure within the battery cell moving out of the pressure relief vent 212. It also, to a certain extent, inhibits the possibility of external objects entering the pressure relief vent 212 and interfering with the structure within the battery cell. Opening the pressure relief vent 212 through the pressure relief mechanism also relieves pressure in the space within the battery cell.

[0117] In some embodiments, the pressure relief mechanism may be a flame retardant cover 24 .

[0118] Exemplarily, the flame retardant cover 24 is made of mica.

[0119] In some embodiments, the box cover 14 is located above the main box 13 .

[0120] In some embodiments, the battery cell is a soft-pack battery cell 22 .

[0121] In some embodiments, the battery cell is a soft-pack battery cell 22, and each battery unit also includes a shell 21, a battery cell cavity 211 is formed in the shell 21, at least one soft-pack battery cell 22 is arranged in the battery cell cavity 211, and at least one side of the shell 21 is provided with an electrode assembly 23 for electrical connection to other structures, and at least one side of the shell 21 is provided with a pressure relief port 212 for pressure relief, and the electrode assembly 23 and the pressure relief port 212 are located on different sides of the shell 21.

[0122] In some embodiments, two adjacent battery cells are bonded together via a thermal insulation pad.

[0123] In some embodiments, referring to Figures 6, 7, and 13, the main case 13 further comprises a third protrusion 136, which is located on a side of the second protrusion 132 facing away from the first protrusion 131. A sealing portion 141 is provided between the second protrusion 132 and the third protrusion 136, and the sealing portion 141 between the second protrusion 132 and the third protrusion 136 is connected to the main case 13.

[0124] In some embodiments, referring to FIG. 13 , the connecting member 6 is located between the second protrusion 132 and the third protrusion 136 .

[0125] In some embodiments, please refer to Figures 1 to 7, which include a case 1 and a battery cell. A storage space 11 is formed inside the case 1. The battery cell is located in the storage space 11. The number of battery cells is at least one, and each battery cell includes a shell 21 and at least one soft-pack battery cell 22. A battery cell cavity 211 is formed inside the shell 21, and at least one soft-pack battery cell 22 is arranged in the battery cell cavity 211. At least one side of the shell 21 is provided with an electrode assembly 23 for electrical connection to other structures, and at least one side of the shell 21 is provided with a pressure relief port 212 for pressure relief. The electrode assembly 23 and the pressure relief port 212 are located on different sides of the shell 21.

[0126] The accommodating space 11 of the box body 1 is used to accommodate the battery unit.

[0127] For example, referring to FIG. 2 , FIG. 3 and FIG. 6 , the number of the accommodating space 11 may be one.

[0128] Exemplarily, the number of the accommodating spaces 11 may be at least two.

[0129] The soft-pack battery cell 22 is a type of battery cell.

[0130] The soft-pack battery cell 22 includes a bare battery cell and a plastic film covering the bare battery cell for protecting the bare battery cell.

[0131] Exemplarily, the plastic film is an aluminum-plastic film.

[0132] 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.

[0133] The bare cell can be a wound bare cell or a laminated bare cell.

[0134] The cell cavity 211 is a cavity for accommodating the soft-pack cell 22 .

[0135] It needs to be explained that the electrode assembly 23 is used for external electrical connection of the battery cell. The soft-pack battery cell 22 in the battery cell can be powered externally through the electrode assembly 23, and the soft-pack battery cell 22 of the corresponding battery cell can also be charged through the electrode assembly 23. Therefore, the electrode assembly 23 is electrically connected to the tab 221 of the soft-pack battery cell 22 in the outer shell 21.

[0136] It should be noted that at least one side of the housing 21 is provided with an electrode assembly 23 for electrical connection to other structures. The "other structures" herein refer to structures on the outside of the corresponding battery cell that are electrically connected to the corresponding battery cell. For example, the battery cells are connected in series or in parallel via the electrode assemblies 23. Of the two battery cells electrically connected via the corresponding electrode assemblies 23, the electrode assembly 23 of one battery cell is the other structure electrically connected to the electrode assembly 23 of the other battery cell.

[0137] A pressure relief port 212 for pressure relief is provided on at least one side of the housing 21 . The housing 21 mainly relieves pressure through the pressure relief port 212 , and the gas in the cell cavity 211 is guided by the housing 21 to be discharged from the pressure relief port 212 .

[0138] It should be noted that the electrode assembly 23 is part of the battery cell, and each battery cell is provided with a corresponding electrode assembly 23 .

[0139] In the embodiment of the present application, when thermal runaway occurs in the soft-pack battery cell 22, the thermal runaway gas in the cell cavity 211 is ejected from the pressure relief vent 212 under the guidance of the outer shell 21, so that the gas ejected from the battery cell due to thermal runaway is ejected in a preset direction, thereby achieving directional ejection of the thermal runaway gas from the battery cell. This preset direction is the direction from the outer shell 21 toward the pressure relief vent 212. The electrode assembly 23 and the pressure relief vent 212 are located on different sides of the outer shell 21, and the thermal runaway gas ejected from the pressure relief vent 212 can avoid the electrode assembly 23 as much as possible.

[0140] In one embodiment, referring to FIG. 1 to FIG. 3 and FIG. 8 to FIG. 10 , the electrode assembly 23 is located on one side of the housing 21 , and the pressure relief port 212 is located on the other side of the housing 21 opposite to the electrode assembly 23 .

[0141] In the embodiment of the present application, the pressure relief port 212 is located on the other side of the shell 21 opposite to the electrode assembly 23. The pressure relief port 212 can be as far away from the electrode assembly 23 as possible, and the thermal runaway gas ejected from the pressure relief port 212 can correspondingly be as far away from the electrode assembly 23 as possible.

[0142] It is understood that the position of the pressure relief port 212 is not limited. For example, the direction of the housing 21 toward the pressure relief port 212 and the direction of the housing 21 toward the electrode assembly 23 can be arranged crosswise.

[0143] In one embodiment, referring to Figures 9 and 10, the number of soft-pack battery cells 22 in each battery unit is at least two, and the electrode assembly 23 includes a sampling electrode 231 and at least two adapter electrodes 232, wherein one adapter electrode 232 is electrically connected to the tab 221 of one of the soft-pack battery cells 22, and the other adapter electrode 232 is electrically connected to the tab 221 of the other soft-pack battery cell 22, and the polarities of the tabs 221 corresponding to the two adapter electrodes 232 are opposite, and the sampling electrode 231 is electrically connected to the tabs 221 of the corresponding two soft-pack battery cells 22, respectively, and the polarities of the tabs 221 of the corresponding two soft-pack battery cells 22 electrically connected to the sampling electrode 231 are opposite.

[0144] The polarities of the tabs 221 corresponding to at least two of the transfer electrodes 232 are opposite, with one transfer electrode 232 having a positive polarity and the other having a negative polarity. The soft-packed cells 22 of the battery unit can be powered externally through the transfer electrodes 232 and can be charged through the transfer electrodes 232.

[0145] The sampling electrodes 231 are electrically connected to the tabs 221 of the two corresponding soft-packed cells 22, and the polarity of the tabs 221 of the two corresponding soft-packed cells 22 electrically connected to the sampling electrodes 231 is opposite. Each sampling electrode 231 is electrically connected to the positive tab 221 of one soft-packed cell 22 and the negative tab 221 of the other soft-packed cell 22, and the soft-packed cells 22 of the battery unit are connected in series through the sampling electrodes 231.

[0146] Exemplarily, referring to FIG. 9 and FIG. 10 , the switching electrode 232 and the sampling electrode 231 are both bars.

[0147] In the embodiment of the present application, the soft-pack cells 22 of the battery unit are connected in series through the sampling electrode 231, and the soft-pack cells 22 of the battery unit are powered or charged through the adapter electrode 232. The sampling electrode 231 connects the soft-pack cells 22 of the battery unit in series. The potential of the sampling electrode 231 is the potential between the two soft-pack cells 22 in series. By measuring and sampling the voltage between the sampling electrode 231 and the corresponding adapter electrode 232, the working status of the corresponding soft-pack cell 22 can be identified. Since the electrode assembly 23 and the pressure relief port 212 are located on different sides of the housing 21, the thermal runaway gas ejected from the pressure relief port 212 can avoid the adapter electrode 232 and the sampling electrode 231 as much as possible.

[0148] In one embodiment, referring to Figures 1 to 3, 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 electrode assembly 23 and the side of the second battery cell 202 having the electrode assembly 23 are close to and opposite to each other.

[0149] For example, referring to Figures 1 to 3, the pressure relief port 212 is located on the other side of the outer shell 21 opposite to the electrode assembly 23, the pressure relief port 212 of the first battery cell 201 is located on the side of the outer shell 21 of the first battery cell 201 away from the second battery cell 202, and the pressure relief port 212 of the second battery cell 202 is located on the side of the outer shell 21 of the second battery cell 202 away from the first battery cell 201.

[0150] It should be noted that the side of the first battery cell 201 having the electrode assembly 23 and the side of the second battery cell 202 having the electrode assembly 23 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-circuiting between the electrode assembly 23 of the first battery cell 201 and the electrode assembly 23 of the second battery cell 202 that are close to each other.

[0151] In the embodiment of the present application, a side of the first battery cell 201 having the electrode assembly 23 and a side of the second battery cell 202 having the electrode assembly 23 are close to and opposite to each other. Since each electrode assembly 23 and the corresponding pressure relief port 212 are on different sides of the corresponding outer shell 21, the pressure relief port 212 of the first battery cell 201 and the pressure relief port 212 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 port 212 of the first battery cell 201 and the pressure relief port 212 of the second battery cell 202 both avoid each electrode assembly 23. The thermal runaway gas ejected from the pressure relief port 212 of the first battery cell 201 can avoid the electrode assembly 23 of the second battery cell 202 as much as possible. The thermal runaway gas ejected from the pressure relief port 212 of the second battery cell 202 can avoid the electrode assembly 23 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.

[0152] In one embodiment, referring to FIG. 1 , the battery pack further includes an insulating layer 3 , and the space between each first battery cell 201 and the corresponding second battery cell 202 is filled with the insulating layer 3 , which covers the electrode assemblies 23 of the first battery cell 201 and the second battery cell 202 , respectively.

[0153] The material of the insulating layer 3 is almost non-conductive.

[0154] In the embodiment of the present application, the electrode assemblies 23 of the first battery cell 201 and the second battery cell 202 are both covered by the insulating layer 3 within the space between the first battery cell 201 and the second battery cell 202. This effectively insulates and isolates the electrode assemblies 23 of the first battery cell 201 and the second battery cell 202 through the insulating layer 3. Furthermore, the thermal runaway gases generated by the battery cell experiencing thermal runaway are blocked by the insulating layer 3. This effectively isolates the electrode assemblies from the thermal runaway gases, thereby suppressing the spread of thermal runaway within the battery pack. Furthermore, the electrode assemblies 23 of the first battery cell 201 and the second battery cell 202 are both covered by the insulating layer 3 within the space between the first battery cell 201 and the second battery cell 202. The insulating layer 3 covering the electrode assembly 23 of the first battery cell 201 and the insulating layer 3 covering the electrode assembly 23 of the second battery cell 202 share the space between the first battery cell 201 and the second battery cell 202, thereby reducing the space occupied by the insulating layer 3 and facilitating improved energy density.

[0155] In one embodiment, referring to FIG. 1 , the insulating layer 3 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 .

[0156] 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.

[0157] Illustratively, the insulating adhesive may be an insulating resin.

[0158] In an embodiment of the present application, 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 electrode assemblies 23 and better separation of the thermal runaway gas from the electrode assembly 23.

[0159] It is understandable that the material of the insulating layer 3 is not limited. For example, the material of the insulating layer 3 can always be in a solid state.

[0160] In one embodiment, referring to Figures 1 and 2, 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.

[0161] For example, referring to FIG. 1 and FIG. 2 , the arrangement direction of the first battery unit 201 and the second battery unit 202 is a first direction.

[0162] For example, referring to FIG. 1 to FIG. 3 , and FIG. 5 and FIG. 6 , the first direction is the direction indicated by the arrow R1 in the figures.

[0163] Exemplarily, referring to FIG. 1 and FIG. 2 , the direction in which at least two first battery units 201 are sequentially arranged is perpendicular to the first direction.

[0164] For example, referring to FIG. 1 and FIG. 2 , the direction in which at least two second battery units 202 are sequentially arranged is perpendicular to the first direction.

[0165] For example, referring to FIG. 1 and FIG. 2 , at least two first battery cells 201 constitute a corresponding battery module 4 , and at least two first battery cells 201 in the corresponding same battery module 4 are arranged in sequence.

[0166] For example, referring to FIG. 1 and FIG. 2 , at least two second battery cells 202 constitute a corresponding battery module 4 , and at least two second battery cells 202 in the corresponding same battery module 4 are arranged in sequence.

[0167] For example, referring to Figures 1 and 2, two battery modules 4 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 electrode assemblies 23 of the twelve first battery cells 201 are all located on the side of the outer shell 21 of the corresponding first battery cell 201 facing the corresponding second battery cell 202, the electrode assemblies 23 of the twelve second battery cells 202 are all located on the side of the outer shell 21 of the corresponding second battery cell 202 facing the corresponding first battery cell 201, the pressure relief ports 212 of the twelve first battery cells 201 are all located on the side of the outer shell 21 of the corresponding first battery cell 201 away from the corresponding second battery cell 202, and the pressure relief ports 212 of the twelve second battery cells 202 are all located on the side of the outer shell 21 of the corresponding second battery cell 202 away from the corresponding first battery cell 201.

[0168] In the embodiment of the present application, at least two first battery cells 201 are arranged in sequence, and at least two second battery cells 202 are arranged in sequence. Since the side of the first battery cell 201 having the electrode assembly 23 and the side of the second battery cell 202 having the electrode assembly 23 are close to each other and arranged opposite to each other, the thermal runaway gas ejected from the pressure relief port 212 of the first battery cells 201 arranged in sequence can avoid the electrode assembly 23 of the second battery cell 202 arranged in sequence as much as possible, and can also avoid the electrode assembly 23 of the adjacent first battery cell 201 in the at least two first battery cells 201 arranged in sequence as much as possible, which is beneficial to suppress 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 port 212 of the second battery cells 202 arranged in sequence can avoid the electrode assembly 23 of the first battery cells 201 arranged in sequence as much as possible, and can also avoid the electrode assembly 23 of the adjacent second battery cells 202 among at least two second battery cells 202 arranged in sequence as much as possible, which is beneficial to suppress the thermal runaway of the second battery cell 202 from spreading to the adjacent second battery cell 202.

[0169] In one embodiment, referring to FIG. 3 and FIG. 7 , the side wall of the accommodating space 11 has an exhaust channel 121 and an exhaust hole 122 . The exhaust channel 121 is connected to the accommodating space 11 through the exhaust hole 122 . The exhaust hole 122 is located on the side of the side wall of the accommodating space 11 facing the accommodating space 11 .

[0170] The exhaust channel 121 and the exhaust hole 122 are used to discharge the thermal runaway gas in the accommodating space 11 out of the box body 1 .

[0171] For example, referring to FIG. 2 , FIG. 3 and FIG. 6 , the side wall of the accommodating space 11 is the target side wall 12 .

[0172] In an embodiment of the present application, the exhaust hole 122 located on the side wall of the accommodating space 11 facing the accommodating space 11 connects the accommodating space 11 in the box body 1 with the exhaust flow channel 121. In the event that thermal runaway occurs in the battery cell in the accommodating space 11, the thermal runaway gas generated by the battery cell is discharged into the accommodating space 11 through the pressure relief port 212. The thermal runaway gas discharged into the accommodating space 11 through the pressure relief port 212 is then discharged to the outside of the box body 1 through the exhaust hole 122 and the corresponding exhaust flow channel 121, thereby reducing the pressure inside the box body 1 of the battery pack.

[0173] In one embodiment, referring to FIG. 3 and FIG. 7 , the first battery unit 201 and the second battery unit 202 are arranged in a first direction, and the exhaust holes 122 are located on the sidewalls of the accommodating space 11 on opposite sides along the first direction.

[0174] For example, referring to FIG. 1 to FIG. 3 and FIG. 5 to FIG. 7 , the first direction is the direction indicated by the arrow R1 in the figures.

[0175] In the embodiment of the present application, the vents 122 are located on the sidewalls of the accommodating space 11 on opposite sides along the first direction. Each vent 122 is relatively close to the pressure relief port 212 of the corresponding first battery cell 201 or the pressure relief port 212 of the corresponding second battery cell 202. Thermal runaway gases ejected from each pressure relief port 212 can enter the exhaust duct 121 and be discharged from the housing 1 as quickly as possible through the vents 122, thereby reducing the retention of thermal runaway gases within the housing 1. The vents 122 are located on the sidewalls of the accommodating space 11 on opposite sides along the first direction. Because the sidewalls of the accommodating space 11 on opposite sides along the first direction face away from the electrode assembly 23 of the corresponding battery cell, thermal runaway gases within the accommodating space 11 are discharged through the vents 122 located on the sidewalls of the accommodating space 11 on opposite sides along the first direction. This facilitates directing the thermal runaway gases away from the corresponding electrode assembly 23, thereby suppressing the spread of thermal runaway within the battery pack.

[0176] It is understood that the position of the exhaust holes 122 is not limited. The exhaust holes 122 can be arranged on two opposite sides of the accommodation space 11 along the first direction.

[0177] In one embodiment, referring to Figures 1 to 5 , the battery pack further includes an explosion-proof valve 5 , and the explosion-proof valve 5 is provided on one or both sides of the box body 1 along the second direction. The second direction is arranged crosswise with the first direction, and the exhaust flow channel 121 is selectively connected to the outside of the box body 1 through the explosion-proof valve 5 .

[0178] For example, referring to FIG. 1 to FIG. 3 and FIG. 5 , the second direction is the direction indicated by the arrow R2 in the figures.

[0179] The exhaust flow channel 121 is selectively connected to the outside of the box body 1 through the explosion-proof valve 5. When the pressure in the exhaust flow channel 121 is less than the valve opening pressure of the explosion-proof valve 5, the explosion-proof valve 5 cuts off the exhaust flow channel 121 from the outside of the box body 1. When the pressure in the exhaust flow channel 121 is greater than or equal to the valve opening pressure of the explosion-proof valve 5, the explosion-proof valve 5 connects the exhaust flow channel 121 with the outside of the box body 1.

[0180] In the embodiment of the present application, since the exhaust duct 121 selectively communicates with the exterior of the housing 1 through the explosion-proof valve 5, the thermal runaway gas within the accommodating space 11 of the housing 1 is sequentially discharged to the exterior of the housing 1 through the exhaust holes 122, the exhaust duct 121, and the explosion-proof valve 5, thereby reducing the pressure within the accommodating space 11 of the housing 1. Since the exhaust holes 122 are located on the sidewalls of the accommodating space 11 on opposite sides along the first direction, and the explosion-proof valve 5 is provided on one or both sides of the housing 1 along the second direction, the thermal runaway gas has a longer path from the exhaust holes 122 through the exhaust duct 121 to the explosion-proof valve 5, which facilitates cooling of the thermal runaway gas, resulting in a lower temperature of the thermal runaway gas discharged from the explosion-proof valve 5.

[0181] It is understandable that the position of the explosion-proof valve 5 is not limited. For example, the explosion-proof valve 5 can be arranged on one side or both sides of the box body 1 along the first direction as appropriate.

[0182] In one embodiment, referring to FIG. 1 to FIG. 3 and FIG. 5 to FIG. 7 , the length direction of the accommodating space 11 is arranged along the second direction.

[0183] In the embodiment of the present application, since the exhaust holes 122 are located on the side walls of the accommodating space 11 on opposite sides along the first direction, and the explosion-proof valve 5 is provided on one side or both sides of the box body 1 along the second direction, the length direction of the accommodating space 11 is arranged along the second direction, so that the side walls of the accommodating space 11 along the first direction are longer, which is conducive to increasing the length of the exhaust flow channel 121 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 5 is lower.

[0184] It can be understood that the length direction of the accommodating space 11 can be arranged along the first direction.

[0185] In one embodiment, referring to Figures 3 and 5 to 7 , the sidewall of the storage space 11 includes a wall 123 and reinforcing ribs 124. Exhaust holes 122 are formed in the wall 123. The reinforcing ribs 124 are connected to the wall 123. The reinforcing ribs 124 and the wall 123 enclose a mutually isolated exhaust channel 121 and a weight-reducing cavity 125. The weight-reducing cavity 125 is located on the side of the exhaust channel 121 facing away from the storage space 11.

[0186] The wall 123 is the main supporting structure of the side wall of the accommodating space 11 .

[0187] Exemplarily, referring to FIG. 2 , FIG. 3 and FIG. 7 , the side wall of the accommodating space 11 is the target side wall 12 .

[0188] For example, referring to FIG. 7 , the reinforcing rib 124 is in the shape of a plate.

[0189] In the embodiment of the present application, vent holes 122 are formed in wall 123, allowing thermal runaway gases within storage space 11 to enter wall 123 through vent holes 122. Reinforcement ribs 124 within wall 123, along with wall 123, enclose an exhaust channel 121 and a weight-reducing cavity 125. The weight-reducing cavity 125 is located on the side of the exhaust channel 121 facing away from storage space 11. The reinforcement ribs 124 enhance the overall strength of storage space 11, while the weight-reducing cavity 125 reduces the weight of the sidewalls of storage space 11. When the sidewalls of storage space 11 are sufficiently strong, this helps improve the energy density of the battery pack. The weight-reducing cavity 125 is located on the side of the exhaust channel 121 facing away from storage space 11. This distance allows the exhaust channel 121 to communicate with the vent holes 122 near storage space 11, thereby receiving thermal runaway gases within storage space 11.

[0190] It is understandable that the specific structure of the side wall of the accommodating space 11 is not limited. For example, the side wall of the accommodating space 11 may include the wall body 123 but not the reinforcing rib 124.

[0191] In one embodiment, referring to Figures 5 to 7 , the housing 1 includes a main housing 13 and a housing cover 14. A storage space 11 is formed in the main housing 13. A first protrusion 131 and a second protrusion 132 are formed above the main housing 13. The second protrusion 132 is located on the side of the first protrusion 131 facing away from the storage space 11. The housing cover 14 covers the storage space 11 of the main housing 13 and has a sealing portion 141. The sealing portion 141 is provided between the first protrusion 131 and the second protrusion 132, as well as on the side of the second protrusion 132 facing away from the first protrusion 131. The sealing portion 141 contacts and seals the main housing 13 along the alignment direction of the main housing 13 and the housing cover 14.

[0192] The accommodating space 11 is formed in the main box 13 , and side walls of the accommodating space 11 are formed on the main box 13 .

[0193] Exemplarily, referring to FIG. 3 and FIG. 5 to FIG. 7 , the exhaust hole 122 and the exhaust flow channel 121 are formed in the main box 13 .

[0194] For example, referring to FIG. 1 to FIG. 5 , the explosion-proof valve 5 is installed on the main box 13 .

[0195] For example, referring to FIG. 6 , the arrangement direction of the main box 13 and the box cover 14 is the direction indicated by the arrow R3 in the figure.

[0196] Exemplarily, the first protrusion 131 and the second protrusion 132 are arranged to extend along the circumference of the accommodation space 11 .

[0197] In the embodiment of the present application, a case cover 14 is provided over the storage space 11 of the main case 13, thereby sealing the battery cells within the storage space 11 within the case body 1. The case cover 14, near the sealing portion 141, forms a multi-curved flow channel structure with the first and second protrusions 131 and 132 of the main case 13. This multi-curved flow channel structure creates greater resistance to fluid flow, thus effectively preventing thermal runaway gases within the storage space 11 of the main case 13 from escaping from between the main case 13 and the case cover 14. This provides a good seal between the main case 13 and the case cover 14.

[0198] It is understandable that the specific structure of the box body 1 is not limited. For example, the first protrusion 131 and the second protrusion 132 may not be provided on the top of the main box 13, and the top of the main box 13 may be a plane.

[0199] In one embodiment, referring to FIG. 8 to FIG. 10 , the battery unit further includes a flame retardant cover 24 covering the pressure relief port 212 , and the pressure bearing capacity of the housing 21 is greater than that of the flame retardant cover 24 .

[0200] Pressure bearing capacity refers to the ability to withstand fluid pressure.

[0201] The relative size of the pressure bearing capacity can be measured by filling gas into the outer shell 21. Specifically, because the flame retardant cover 24 is provided on the pressure relief port 212, the outer shell 21 and the flame retardant cover 24 basically seal the battery cell cavity 211. When gas is filled into the battery cell cavity 211, the gas pressure in the battery cell cavity 211 continuously increases, and the gas pressure borne by the outer shell 21 and the flame retardant cover 24 continuously increases. In the process of continuously filling the battery cell cavity 211 with gas, the flame retardant cover 24 is damaged before the outer shell 21, that is, the pressure bearing capacity of the flame retardant cover 24 is less than that of the outer shell 21, and the pressure bearing capacity of the outer shell 21 is greater than that of the flame retardant cover 24.

[0202] The flame-retardant cover 24 has a certain flame-retardant capability. In the event of thermal runaway of the battery cell, the flame-retardant cover 24 may be deformed due to the high temperature, but will basically not be ignited.

[0203] In the embodiment of the present application, the flame retardant cover 24 is provided on the pressure relief port 212. The flame retardant cover 24 has a certain flame retardant ability, which can reduce the possibility of the flame retardant cover 24 being ignited in the event of thermal runaway of the battery cell to a certain extent. The flame retardant cover 24 is provided on the pressure relief port 212. 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 battery cell cavity 211 through the pressure relief port 212, which is beneficial to suppress the spread of thermal runaway to a certain extent. In the event of thermal runaway of the soft-pack battery cell 22 in the battery cell cavity 211, since the pressure bearing capacity of the outer shell 21 is greater than the pressure bearing capacity of the flame retardant cover 24, the thermal runaway gas in the battery cell cavity 211 first breaks through the flame retardant cover 24, causing the thermal runaway gas in the battery cell cavity 211 to be directionally ejected from the pressure relief port 212.

[0204] In one embodiment, referring to FIG. 8 to FIG. 10 , the flame retardant cover 24 is made of mica.

[0205] Illustratively, the flame retardant cover 24 may be mica paper.

[0206] Illustratively, the flame retardant cover 24 is mica paper.

[0207] Exemplarily, the mica paper is bonded to the housing 21 .

[0208] In the embodiment of the present application, the flame retardant cover 24 is made of mica. Mica has a certain flame retardant property and will not be ignited in the event of thermal runaway of the battery cell. The thinner the flame retardant cover 24 made of mica, the smaller the pressure bearing capacity.

[0209] In one embodiment, referring to Figures 8 to 10 , the housing 21 includes a main housing 213 and a top cover 214 . A pressure relief vent 212 is formed in the main housing 213 . The top cover 214 and the main housing 213 enclose a cell chamber 211 , and the electrode assembly 23 is disposed on the top cover 214 .

[0210] In an embodiment of the present application, before the top cover 214 is installed on the main shell 213, the electrode assembly 23 on the top cover 214 can be electrically connected to the tab 221 of the soft-pack battery cell 22, and then the connected top cover 214, electrode assembly 23 and soft-pack battery cell 22 are installed to the main shell 213, so as to facilitate the connection of the electrode assembly 23 and the soft-pack battery cell 22 before entering the shell.

[0211] In one embodiment, referring to FIG. 8 to FIG. 10 , the main housing 213 is made of metal or plastic, and the top cover 214 is made of plastic.

[0212] Exemplarily, the main shell 213 is made of metal, and the thickness of the main shell 213 is 0.1 mm to 1 mm.

[0213] Illustratively, the thickness of the main shell 213 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, or 1 mm.

[0214] Exemplarily, the main shell 213 is made of plastic, is an integrally formed structure, and has a thickness of 1 mm to 3 mm.

[0215] Illustratively, the thickness of the main shell 213 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.

[0216] In this embodiment of the present application, the metal or plastic main housing 213 effectively protects the pouch cell 22 within the cell cavity 211. The plastic top cover 214 provides excellent insulation, facilitating installation of the electrode assembly 23. The mica flame-retardant cover 24 prevents ignition in the event of thermal runaway and facilitates fabrication with a structure having a low pressure-bearing capacity.

[0217] It is understandable that the materials of the outer shell 21 and the flame retardant cover 24 can be set according to actual needs.

[0218] In one embodiment, the ignition point of the flame retardant cover 24 and the ignition point of the outer shell 21 are both greater than or equal to 800°C.

[0219] For example, the ignition point of the flame retardant cover 24 may be 800° C., 810° C., 860° C., 900° C., or the like.

[0220] For example, the ignition point of the flame retardant cover 24 can be measured by heating the flame retardant cover 24 to a state where the flame retardant cover 24 just burns.

[0221] For example, the ignition point of the shell 21 can be measured by heating the shell 21 to a state where the shell 21 is just burning.

[0222] In the embodiment of the present application, the ignition points of the flame retardant cover 24 and the outer shell 21 are relatively high, and even under the influence of thermal runaway gas at a relatively high temperature, the flame retardant cover 24 and the outer shell 21 will basically not be ignited.

[0223] In one embodiment, referring to FIG. 12 , the top cover 214 has a flange 2141 covering the side wall of the main shell 213 , and a gap between the flange 2141 and the side wall of the main shell 213 is less than or equal to 0.5 mm.

[0224] Exemplarily, the gap between the flange 2141 and the side wall of the main shell 213 may be 0.5 mm, 0.4 mm, 0.3 mm, 0.2 mm or 0.1 mm.

[0225] For example, before the top cover 214 is installed into the main shell 213 but before the top cover 214 is connected to the main shell 213, the dimension between the flange 2141 and the side wall of the main shell 213 can be measured by a feeler gauge, a vernier caliper or a micrometer.

[0226] For example, the span of the flange 2141 of the top cover 214 and the corresponding span of the main shell 213 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 214 and the main shell 213.

[0227] For example, referring to FIG. 12 , the gap between the flange 2141 and the side wall of the main shell 213 is D1 , and D1 ≤ 0.5 mm.

[0228] In the embodiment of the present application, the flange 2141 is not completely sealed from the side wall of the main shell 213, and the gap between the flange 2141 and the side wall of the main shell 213 is relatively appropriate, so that the resistance to the escape of thermal runaway gas from between the flange 2141 and the side wall of the main shell 213 is relatively large, which can better suppress the thermal runaway gas from erupting toward the top cover 214, thereby better guiding the thermal runaway gas in the accommodating space 11 to erupt in a directional manner from the pressure relief port 212.

[0229] It is understandable that there may be no gap between the main shell 213 and the top cover 214 , and the main shell 213 and the top cover 214 may be completely sealed.

[0230] In one embodiment, please refer to Figure 8, the flame-retardant cover 24 is formed with a through hole 241 connected to the battery cell cavity 211, and the battery unit also includes a temperature control container 25 partially located in the battery cell cavity 211, and soft-pack battery cells 22 are arranged on one side or two opposite sides of the temperature control container 25. The temperature control container 25 has a temperature control cavity and an inlet 251 and an outlet 252 respectively connected to the temperature control cavity. The temperature control container 25 is passed through the through hole 241 so that the inlet 251 and the outlet 252 are exposed outside the battery cell along the side of the outer shell 21 facing the flame-retardant cover 24.

[0231] For example, referring to FIG. 10 , soft-pack battery cells 22 are provided on two opposite sides of the temperature-regulating container 25 , with two soft-pack battery cells 22 on each side.

[0232] Exemplarily, referring to FIG. 10 , the two soft-pack battery cells 22 on each side are connected in series via corresponding sampling electrodes 231 , and the two soft-pack battery cells 22 on each side are powered or charged via corresponding two transfer electrodes 232 .

[0233] For example, referring to FIG. 11 , the number of soft-pack battery cells 22 on each side may be one.

[0234] Exemplarily, the number of the soft-pack battery cell 22 on each side may be one, and the soft-pack battery cells 22 on both sides may be connected in series via corresponding sampling electrodes 231 .

[0235] Exemplarily, referring to FIG. 11 , the temperature regulating container 25 and the corresponding side soft-pack battery cells 22 are arranged along a preset direction, and the preset direction is perpendicular to the surface of the soft-pack battery cells 22 with the largest area.

[0236] Exemplarily, referring to FIG. 11 , the preset direction is the direction indicated by the arrow R4 in the figure.

[0237] In the embodiment of the present application, the inlet 251 and outlet 252 of the temperature regulating container 25 extend outside the cell cavity 211 through the through hole 241 of the flame-retardant cover 24. This facilitates connecting the temperature regulating container 25 to an external fluid source through the inlet 251 and outlet 252, allowing external fluid to enter the temperature regulating container 25 through the inlet 251 and flow out through the outlet 252, thereby regulating the temperature of the pouch cell 22. The inlet 251 and outlet 252 of the temperature regulating container 25 extend outside the cell cavity 211 through the through hole 241 of the flame-retardant cover 24, eliminating the need for sealing at the through hole 241, which helps simplify the structure of the battery cell.

[0238] An embodiment of the present application also provides a battery module 4, please refer to Figures 1 and 2, the battery module 4 includes at least two battery cells arranged in sequence, each battery cell includes a shell 21 and at least one soft-pack battery cell 22, a battery cell cavity 211 is formed inside the shell 21, at least one soft-pack battery cell 22 is arranged in the battery cell cavity 211, at least one side of the shell 21 is provided with an electrode assembly 23 for electrical connection to other structures, at least one side of the shell 21 is provided with a pressure relief port 212 for pressure relief, the electrode assembly 23 and the pressure relief port 212 are located on different sides of the shell 21, the electrode assemblies 23 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 electrode assembly 23 is arranged crosswise with the direction in which the at least two battery cells are arranged in sequence.

[0239] For example, referring to FIG. 1 and FIG. 2 , in at least two battery cells arranged in sequence, the orientation of the electrode assembly 23 is perpendicular to the direction in which the at least two battery cells are arranged in sequence.

[0240] For example, referring to FIG. 1 and FIG. 2 , the electrode assemblies 23 of the first battery cells 201 in the same battery module 4 all face the corresponding second battery cells 202 .

[0241] For example, referring to FIG. 1 and FIG. 2 , the electrode assemblies 23 of the second battery cells 202 in the same battery module 4 all face the corresponding first battery cells 201 .

[0242] For example, please refer to FIG. 1 and FIG. 2 , which show two battery modules 4 .

[0243] In an embodiment of the present application, the number of battery cells in the battery module 4 is at least two. Since the electrode assembly 23 and the pressure relief port 212 are located on different sides of the outer shell 21, and the electrode assemblies 23 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 electrode assembly 23 is arranged crosswise with the direction in which the at least two battery cells are arranged in sequence, so that the pressure relief port 212 of each battery cell in the battery module 4 can avoid the electrode assembly 23 of each battery cell, reducing the possibility that the thermal runaway gas ejected from the pressure relief port 212 of any battery cell will short-circuit the electrode assembly 23 of the adjacent battery cell, thereby facilitating the thermal runaway of the battery cell from spreading to the adjacent battery cell.

[0244] An embodiment of the present application also provides a battery cell, please refer to Figures 8 to 10, the battery cell includes a shell 21 and at least one soft-pack battery cell 22, a battery cell cavity 211 is formed inside the shell 21, at least one soft-pack battery cell 22 is arranged in the battery cell cavity 211, at least one side of the shell 21 is provided with an electrode assembly 23 for electrical connection to other structures, at least one side of the shell 21 is provided with a pressure relief port 212 for pressure relief, and the electrode assembly 23 and the pressure relief port 212 are located on different sides of the shell 21.

[0245] In the embodiment of the present application, the electrode assembly 23 and the pressure relief port 212 are located on different sides of the outer shell 21, so that the pressure relief port 212 of the battery cell can be away from the electrode assembly 23. When at least two battery cells are arranged in sequence and the electrode assemblies 23 of at least two battery cells arranged in sequence are oriented in the same direction, the pressure relief port 212 of at least two battery cells arranged in sequence can avoid the electrode assemblies 23 of each battery cell, and the thermal runaway gas ejected from the pressure relief port 212 can be as far away from the electrode assembly 23 of the adjacent battery cell as possible, reducing the possibility of short-circuiting the electrode assembly 23 of the adjacent battery cell, thereby suppressing the possibility of thermal runaway of the battery cell spreading to the adjacent battery cell.

[0246] In one embodiment, referring to Figures 1 to 12, the top cover 214, main shell 213, and mica paper serving as the flame-retardant cover 24 of the battery cell do not need to be completely sealed; they only need to be able to guide the thermal runaway gas within the cell cavity 211 to erupt from the pressure relief vent 212. A soft-pack battery cell 22 is disposed within the space enclosed by the main shell 213, top cover 214, and flame-retardant cover 24. 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 having the electrode assembly 23 and the side of the second battery cell 202 having the electrode assembly 23 are disposed adjacent to and opposite each other. The space between each first battery cell 201 and the corresponding second battery cell 202 is filled with an insulating layer 3, which covers the electrode assemblies 23 of the first battery cell 201 and the second battery cell 202, respectively. The insulating layer 3 is made of insulating glue, which is liquid before filling. The liquid insulating glue can solidify between the first battery cell 201 and the second battery cell 202. The electrode assembly 23 is located on one side of the outer shell 21, and the pressure relief vent 212 is located on the other side of the outer shell 21 opposite the electrode assembly 23. There are at least two first battery cells 201, and at least two first battery cells 201 form a corresponding battery module 4. The at least two first battery cells 201 in the same battery module 4 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 4. The at least two second battery cells 202 in the same battery module 4 are arranged in sequence. The housing 1 includes a main box 13 and a cover 14. A storage space 11 is formed in the main box 13. A first protrusion 131 and a second protrusion 132 are formed above the main box 13. The second protrusion 132 is located on the side of the first protrusion 131 facing away from the storage space 11. The box cover 14 is disposed over the storage space 11 of the main box 13. The box cover 14 has a sealing portion 141. The sealing portion 141 is provided between the first protrusion 131 and the second protrusion 132, as well as on the side of the second protrusion 132 facing away from the first protrusion 131. The sealing portion 141 contacts and seals the box body 1 along the arrangement direction of the main box 13 and the box cover 14. Sealant can be filled between the sealing portion 141 and the main box 13 to improve the sealing performance between the main box 13 and the box cover 14. The sidewalls of the storage space 11 include a wall 123 and a reinforcing rib 124. An exhaust hole 122 is formed in the wall 123. The reinforcing rib 124 is connected to the wall 123. The reinforcing rib 124 and the wall 123 enclose an isolated exhaust channel 121 and a weight reduction chamber 125. The weight reduction chamber 125 is located on the side of the exhaust channel 121 facing away from the storage space 11. The box cover 14 and the main box 13 are connected by screws, which are located on the side of the reinforcing rib 124 away from the exhaust flow channel 121. The weight reduction cavity 125 can be connected to the outside of the box body 1. The electrode assembly 23 installed on the top cover 214 is a bar.The first battery cells 201 and the second battery cells 202 are arranged in a first direction, with the exhaust holes 122 located on the sidewalls of the storage space 11 on opposite sides along the first direction. Explosion-proof valves 5 are provided on one or both sides of the housing 1 along a second direction, intersecting the first direction. The exhaust duct 121 selectively communicates with the exterior of the housing 1 through the explosion-proof valves 5. The sidewalls of the storage space 11 of the housing 1 can be made of aluminum or magnesium extrusions. Both the housing cover 14 and the bottom plate of the main housing 13 can be made of sheet metal, composite materials, or carbon fiber.

[0247] The above are merely preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations of the present disclosure 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 pack comprising: At least one battery unit, each of the battery units having a pressure relief port, and each of the battery units including at least one battery cell; A box body has a storage space formed therein, and the battery cell is located in the storage space. The box body includes a main box and a box cover. The storage space is formed in the main box. A first protrusion is formed on the side of the main box facing the box cover. The box cover is arranged in the storage space of the main box. The box cover has a sealing part. The sealing part is in contact and sealed with the main box along the arrangement direction of the main box and the box cover. The sealing part is located on the side of the first protrusion facing away from the battery cell.

2. The battery pack according to claim 1, wherein: A second protrusion is formed on a side of the main box facing the box cover. The second protrusion is located on a side of the first protrusion away from the accommodating space. The sealing portion is provided between the first protrusion and the second protrusion.

3. The battery pack according to claim 2, wherein: The sealing portion has a first sealing surface, and the main box includes: a box body, wherein the accommodating space, the first protrusion, and the second protrusion are all formed in the box body, the box body having a second sealing surface located between the first protrusion and the second protrusion, and the second sealing surface is located on a side of the recessed space between the first protrusion and the second protrusion facing away from the box cover; A sealing medium is located in the recessed space between the first protruding portion and the second protruding portion, and the sealing medium contacts and seals the first sealing surface and the second sealing surface respectively.

4. The battery pack according to claim 2 or 3, wherein: The sealing part has a weight-reducing empty area on the side facing away from the main box, and the box cover also has an avoidance platform. The avoidance platform has an avoidance empty area on the side facing the main box. The avoidance platform and the sealing part are alternately arranged along the arrangement direction of the first protrusion and the second protrusion, and the first protrusion and the second protrusion are respectively located in the corresponding avoidance empty areas.

5. The battery pack according to any one of claims 2 to 4, wherein: A sealing portion is provided on a side of the second protrusion facing away from the first protrusion, and the sealing portion is connected to the main box.

6. The battery pack according to claim 5, wherein: The battery pack further includes a connector, which is connected to the sealing portion and the main box respectively, and is located on a side of the second protrusion away from the first protrusion.

7. The battery pack according to any one of claims 1 to 6, wherein: The main box is made of a carbon fiber woven composite material, and the box cover is made of a carbon fiber woven composite material.

8. The battery pack according to any one of claims 1 to 7, wherein: The pressure relief port is located on one side of the battery unit along a preset direction, the arrangement direction of the main box and the box cover are arranged to intersect the preset direction, and the sealing portion is located on the side of the pressure relief port along the main box pointing to the box cover.

9. The battery pack according to claim 8, wherein: Projected along the preset direction, the projection area of ​​the sealing portion and the projection area of ​​the pressure relief port are arranged at intervals.

10. The battery pack according to claim 8 or 9, wherein: The battery unit further includes a pressure relief mechanism covering the pressure relief port, and the pressure relief mechanism is used to open or close the pressure relief port.

11. The battery pack according to claim 10, wherein: The pressure relief mechanism is a flame retardant cover.

12. The battery pack according to any one of claims 1 to 11, wherein: The box cover is located above the main box.

13. The battery pack according to any one of claims 1 to 12, wherein: The battery cell is a soft-pack battery cell, and each of the battery units further includes a shell, a battery cell cavity is formed in the shell, and the at least one soft-pack battery cell is arranged in the battery cell cavity. At least one side of the shell is provided with an electrode assembly for electrical connection to other structures, and at least one side of the shell is provided with the pressure relief port for pressure relief, and the electrode assembly and the pressure relief port are located on different sides of the shell.

14. An electrical device, wherein: include: Device body; The battery pack according to any one of claims 1 to 13, mounted on the device body to supply power to the device body.

Images