Battery and electric device

Abstract

The invention provides a battery and an electric device. The battery comprises a box body, a battery monomer and a blocking structure, wherein the box body is provided with an accommodating cavity; the battery monomer group is positioned in the accommodating cavity, the battery monomer group comprises at least one row of multiple battery monomers arranged along a first direction, each battery monomer comprises a first wall and a second wall which are connected and intersected, the first wall is provided with a pressure relief mechanism, and a gap is formed between the second wall and the box body. High-temperature sprayed objects are sprayed out from the pressure relief mechanism of the first wall, and at least part of the blocking structure is located in the gap to block at least part of emissions discharged by the pressure relief mechanism from entering the gap, so that the problems that the high-temperature sprayed objects damage an insulating film of the second wall and are in lap joint with the second wall and the inner wall of the box body, and consequently, the internal short circuit of the battery is caused are solved; therefore, the reliability of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery and an electrical device. Background Art

[0002] Lithium-ion power batteries have the characteristics of high operating voltage, high specific energy, small size, light weight, long cycle life, low self-discharge rate, no memory effect, and no pollution. Therefore, they are used by many power equipment manufacturers.

[0003] In the existing technology, when the battery is in thermal runaway, its high-temperature ejecta spread to the space between the battery cell and the casing, damaging the insulating film of the battery cell and causing the battery cell and the casing to overlap, which aggravates the thermal runaway of the battery and urgently needs improvement. Summary of the Invention

[0004] In view of the above problems, the present application provides a battery and an electrical device that can improve the problem of thermal runaway of the battery caused by the high-temperature ejecta of the battery damaging the insulating film of the battery cell, causing the battery cell and the box to overlap, thereby aggravating the thermal runaway of the battery, thereby improving the reliability of the battery.

[0005] In a first aspect, the present application provides a battery, comprising: a case having a accommodating cavity; a battery cell group located in the accommodating cavity, the battery cell group comprising at least one column of multiple battery cells arranged along a first direction, the battery cells comprising a first wall and a second wall connected and intersecting, the first wall being provided with a pressure relief mechanism, and a gap being provided between the second wall and the case; a blocking structure, at least a portion of the blocking structure being located in the gap, so as to block at least a portion of the emissions discharged through the pressure relief mechanism from entering the gap.

[0006] In the scheme of the embodiment of the present application, the battery includes a box body, a battery cell and a blocking structure, the box body has a accommodating cavity; the battery cell group is located in the accommodating cavity, the battery cell group includes at least one column of multiple battery cells arranged along a first direction, the battery cell includes a first wall and a second wall that are connected and intersecting, the first wall is provided with a pressure relief mechanism, and there is a gap between the second wall and the box body. When the battery thermally runs away, high-temperature ejecta is ejected from the pressure relief mechanism of the first wall, and at least part of the blocking structure is located in the gap to prevent at least part of the emissions discharged through the pressure relief mechanism from entering the gap, so as to improve the risk of high-temperature ejecta damaging the insulating film of the second wall. The high-temperature ejecta overlaps the second wall and the inner wall of the box, causing an internal short circuit in the battery, and the risk of aggravated thermal runaway of the battery, thereby improving the reliability of the battery.

[0007] In some embodiments, the blocking structure is connected to an outer surface of the battery cell and extends from the outer surface of the battery cell to the gap.

[0008] In the technical solution of the embodiment of the present application, the blocking structure is connected to the outer surface of the battery cell and extends from the outer surface of the battery cell to the gap, reducing the distance between the blocking structure and the pressure relief structure, improving the blocking effect of the blocking structure, and can also reduce the size of the blocking structure and reduce the weight of the battery.

[0009] In some embodiments, the blocking structure includes a first segment and a second segment connected to each other, the box body includes a first box wall, the first segment is disposed between the first wall and the first box wall, and the second segment extends into the gap.

[0010] In the technical solution of the embodiment of the present application, the blocking structure includes a first segment and a second segment that are interconnected, the box body includes a first box wall, the first segment is arranged between the first wall and the first box wall, the first segment serves to enhance the rigidity of the battery and improve the deformation resistance of the box body, the second segment extends into the gap, the second segment serves to block high-temperature ejecta from entering the gap, thereby improving the reliability of the battery.

[0011] In some embodiments, the box body further includes a second box wall connected to a peripheral side of the first box wall, and a gap is formed between the second box wall and the second wall.

[0012] In the technical solution of the embodiment of the present application, the box body also includes a second box wall connected to the peripheral side of the first box wall, and a gap is formed between the second box wall and the second wall, reducing the distance between the gap and the first wall, so that while the blocking structure has the effect of blocking high-temperature ejecta from entering the gap, the size of the second segment is reduced, thereby reducing the processing difficulty of the blocking structure.

[0013] In some embodiments, the battery further includes an electrical connection structure, which is connected to one end of the battery cell group in the first direction and extends toward the other end of the battery cell group in the first direction. The electrical connection structure includes an extension segment located within the gap, and the extension segment is connected to the second segment.

[0014] In the technical solution of an embodiment of the present application, the battery also includes an electrical connection structure, which is connected to one end of the battery cell group in the first direction, and the electrical connection structure extends toward the other end of the battery cell group in the first direction. The electrical connection structure includes an extended segment located in the gap to rationally utilize the internal space of the box and improve the utilization rate of the internal space of the box. The extended segment and the second segment are connected to improve the stability of the electrical connection structure.

[0015] In some embodiments, the portion of the second segment located in the gap is bent in a direction away from the first box wall to form an accommodating space between the second segment and the first box wall, and at least a portion of the extended segment is disposed in the accommodating space.

[0016] In the technical solution of the embodiment of the present application, part of the second segment located in the gap is bent in a direction away from the first box wall to form an accommodating space between the second segment and the first box wall, and at least part of the extended segment is arranged in the accommodating space. The accommodating space formed by the bending increases the distance between the second segment and the first box wall, reduces the difficulty of matching the extended segment and the second segment, and at least part of the extended segment is arranged in the accommodating space, so that the second segment plays a limiting effect on the extended segment through the wall of the accommodating space.

[0017] In some embodiments, the blocking structure further includes a connector located in the accommodating space, one end of the connector is connected to the second segment, and the other end of the connector is connected to the extension segment.

[0018] In the technical solution of the embodiment of the present application, the blocking structure further includes a connector located in the accommodating space, and the extended segment is connected to the second segment through the connector to improve the connection reliability between the second segment and the extended segment.

[0019] In some embodiments, the battery further includes a heat exchange structure for regulating the temperature of the battery cells. At least a portion of the heat exchange structure is accommodated in the gap and is located on a side of the second segment away from the first box wall.

[0020] In the technical solution of the embodiment of the present application, the battery also includes a heat exchange structure, which is used to adjust the temperature of the battery cell. At least part of the heat exchange structure is accommodated in the gap, and at least part of the heat exchange structure is located on the side of the second segment away from the first box wall, so that when the battery thermal runaway, the second segment can be used to prevent high-temperature ejecta from contacting the heat exchange structure, thereby improving the service life of the heat exchange structure.

[0021] In some embodiments, the heat exchange structure includes a heat exchange body and a heat exchange pipeline. The heat exchange body and the battery cell are thermally connected. The heat exchange pipeline is connected to the heat exchange body and the external environment. At least part of the heat exchange pipeline is located on the side of the second segment away from the first box wall.

[0022] In the technical solution of the embodiment of the present application, the heat exchange structure includes a heat exchange body and a heat exchange pipeline. The heat exchange body and the battery cell are thermally connected so that the heat exchange body can be used to regulate the temperature of the battery cell. The heat exchange pipeline is connected to the heat exchange body and the external environment. At least part of the heat exchange pipeline is located on the side of the second segment away from the first box wall, so that the second segment can replace the heat pipeline to block at least part of the high-temperature ejecta when the battery thermal runaways, thereby improving the service life of the heat exchange structure.

[0023] In some embodiments, the first segment includes a weight reduction cavity extending along the first direction.

[0024] In the technical solution of the embodiment of the present application, the first segment includes a weight-reducing cavity extending along the first direction to reduce the weight of the blocking structure, thereby achieving the effect of reducing the overall weight of the battery; and when the first box wall is impacted by external force, the first segment can absorb energy through the deformation of the weight-reducing cavity, thereby improving the protection capability of the blocking structure to the battery cell group.

[0025] In some embodiments, the battery further includes a buffer member, which is disposed between the first segment and the first box wall, and the buffer member is configured to be retractable along the thickness direction of the first box wall.

[0026] In the technical solution of the embodiment of the present application, the battery also includes a buffer, which is arranged between the first segment and the first box wall. The buffer is retractably arranged along the thickness direction of the first box wall. The buffer can absorb the assembly tolerance between the first segment and the first box wall, thereby reducing the processing difficulty of the battery.

[0027] In some embodiments, the box body also includes a beam extending along the second direction and connected to the inner wall of the box body. The two beams are spaced apart in the first direction, the battery cell group is located between the two beams, and the two ends of the blocking structure are connected to the two beams. The first direction and the second direction intersect.

[0028] In the technical solution of the embodiment of the present application, the box body also includes a beam extending along the second direction and connected to the inner wall of the box body. The two beams are spaced apart in the first direction, the battery cell group is located between the two beams, and the two ends of the blocking structure are connected to the two beams to improve the connection reliability between the blocking structure and the box body.

[0029] In some embodiments, the battery further includes a pressure strip, the two ends of which are connected to the two beams, multiple battery cell groups are arranged along the second direction, the pressure strip connects two adjacent battery cell groups, and the blocking structure is connected to the battery cell groups at both ends in the second direction.

[0030] In the technical solution of the embodiment of the present application, the battery also includes a pressure strip, the two ends of which are connected to two cross beams to improve the connection reliability between the pressure strip and the box body. Multiple battery cell groups are arranged along the second direction. The pressure strip enhances the rigidity of the box body. The pressure strip connects two adjacent battery cell groups. The blocking structure is connected to the battery cell groups at both ends of the second direction, so that the pressure strip and the blocking structure have the effect of fixing and limiting the battery cell groups, thereby improving the reliability of the battery.

[0031] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery provided by any of the above-mentioned embodiments of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0033] Figure 1 is a structural schematic diagram of a vehicle provided in one embodiment of the present application;

[0034] Figure 2 1 is a schematic structural diagram of a battery provided in one embodiment of the present application;

[0035] Figure 3 This is a schematic structural diagram of a battery module provided in one embodiment of the application;

[0036] Figure 4 This is a schematic structural diagram of a battery cell provided in one embodiment of the present application;

[0037] Figure 5 1 is a schematic structural diagram of a battery provided in one embodiment of the present application;

[0038] Figure 6 is an exploded view of a battery provided in one embodiment of the present application;

[0039] Figure 7 yes Figure 5 Cross-section at AA in the middle;

[0040] Figure 8 yes Figure 7 Schematic diagram of the enlarged structure at B in the middle;

[0041] Figure 9 This is a partial structural diagram of a battery provided in one embodiment of the present application;

[0042] Figure 10 is a top view of a blocking structure of a battery provided in one embodiment of the present application;

[0043] Figure 11 yes Figure 10 Cross-sectional view at CC;

[0044] Figure 12 is a top view of a blocking structure of a battery provided in another embodiment of the present application;

[0045] Figure 13 yes Figure 12 Cross-sectional view at DD in the middle;

[0046] Figure 14 Schematic diagram of the blocking structure of a battery provided in one embodiment of the present application.

[0047] 1. Vehicle; 101. Motor; 102. Controller; 201. Battery module;

[0048] 2. Battery; 202. Box; 2021. First box portion; 2022. Second box portion; 2023. First box wall; 2024. Second box wall; 203. Gap; 204. Beam;

[0049] 3. Battery cell; 31. First wall; 32. Second wall; 4. Housing; 5. Electrode assembly; 6. Top cover assembly;

[0050] 7. Battery cell group;

[0051] 8. Blocking structure; 81. First segment; 82. Second segment; 811. Weight reduction cavity; 84. Connector; 85. Connecting segment; 821. Accommodating space;

[0052] 91. Heat exchange structure; 92. Electrical connection structure; 93. Buffer; 94. Pressure strip; 911. Heat exchange body; 912. Heat exchange pipeline; 921. Extension segment. DETAILED DESCRIPTION

[0053] 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.

[0054] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0055] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0056] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0057] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and 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.

[0058] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0059] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0060] In this application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, and the embodiments of this application are not limited thereto. Battery cells may be cylindrical, flat, rectangular, or in other shapes, and the embodiments of this application are not limited thereto.

[0061] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing that encloses one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0062] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer, with the positive active material layer coated on the surface of the positive current collector. The positive current collector includes a positive current collector portion and a positive electrode tab connected to the positive current collector portion. The positive current collector portion is coated with the positive active material layer, while the positive electrode tab is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, which is coated on the surface of the current collector. The negative current collector includes a negative current collecting portion and a negative electrode tab connected to the negative current collecting portion. The negative current collecting portion is coated with the negative active material layer, while the negative tab is not coated with the negative active material layer. The negative current collector can be made of copper, and the negative active material layer includes a negative active material, which can be carbon or silicon, for example. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene).

[0063] In the related art, when thermal runaway occurs inside the battery, the degree of thermal runaway exceeds expectations.

[0064] After disassembling the battery, it was learned that when the battery was in thermal runaway, high-temperature ejecta was ejected from the explosion-proof valve of the battery cell, and the high-temperature ejecta overflowed between the battery cell and the shell. The high-temperature ejecta melted the insulating film of the battery cell, and the high-temperature ejecta overlapped between the battery shell and the shell, and the battery shell and the shell were connected, causing the thermal runaway to be further aggravated.

[0065] Based on the above problems, an embodiment of the present application provides a battery, which includes a case, a battery cell and a blocking structure, the case having a accommodating cavity; the battery cell group is located in the accommodating cavity, the battery cell group includes at least one column of multiple battery cells arranged along a first direction, the battery cell includes a first wall and a second wall that are connected and intersecting, the first wall is provided with a pressure relief mechanism, and there is a gap between the second wall and the case. When the battery thermally runs away, high-temperature ejecta is ejected from the pressure relief mechanism of the first wall, and at least part of the blocking structure is located in the gap to block at least part of the emissions discharged through the pressure relief mechanism from entering the gap, so as to improve the risk of high-temperature ejecta damaging the insulating film of the second wall, and the high-temperature ejecta overlaps the second wall and the inner wall of the case, causing an internal short circuit in the battery, aggravating the risk of thermal runaway of the battery, and improving the reliability of the battery.

[0066] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0067] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0068] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the batteries and electrical equipment described above, but can also be applied to all batteries including boxes and electrical equipment using batteries. However, for the sake of simplicity, the following embodiments are explained using electric vehicles as an example.

[0069] Please refer to Figure 1 , Figure 1 Schematic diagram of the structure of vehicle 1 provided for some embodiments of the present application. Vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 2 is provided inside the vehicle 1, and the battery can be provided at the bottom, head or tail of the vehicle 1. Battery 2 can be used to power the vehicle 1. For example, battery 2 can serve as an operating power source for the vehicle 1. Vehicle 1 can also include a controller 102 and a motor 101. The controller 102 is used to control the battery to power the motor 101, for example, for starting, navigating and operating power requirements of the vehicle 1 during driving.

[0070] In some embodiments of the present application, the battery can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0071] In order to meet different power requirements, the battery 2 may include a plurality of battery cells, which refers to the smallest unit that constitutes a battery module or a battery pack. A plurality of battery cells can be connected in series and / or in parallel via electrode terminals for use in various applications. The battery 2 mentioned in this application includes a battery module or a battery pack. Among them, a plurality of battery cells can be connected in series, in parallel, or in mixed connection, and mixed connection refers to a mixture of series and parallel connection. In the embodiment of the present application, a plurality of battery cells can directly constitute a battery pack, or they can first constitute a battery module, and then the battery module constitutes a battery pack.

[0072] Figure 2A schematic structural diagram of a battery 2 according to an embodiment of the present application is shown.

[0073] like Figure 2 As shown, the battery includes a box body 202 and a battery cell (not shown), and the battery cell is accommodated in the box body 202.

[0074] The housing 202 may be a simple three-dimensional structure such as a single rectangular parallelepiped, cylinder, or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as rectangular parallelepiped, cylinder, or sphere. The housing 202 may be made of an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0075] The housing 202 is used to accommodate battery cells and can have various structures. In some embodiments, the housing 202 can include a first housing portion 2021 and a second housing portion 2022. The first housing portion 2021 and the second housing portion 2022 overlap each other, and the first housing portion 2021 and the second housing portion 2022 together define a storage space for accommodating the battery cells 3. The second housing portion 2022 can be a hollow structure with one end open. The first housing portion 2021 is a plate-like structure, and the first housing portion 2021 overlaps the open side of the second housing portion 2022 to form the housing 202 with a storage space. The first housing portion 2021 and the second housing portion 2022 can also both be hollow structures with one end open, and the open side of the first housing portion 2021 overlaps the open side of the second housing portion 2022 to form the housing 202 with a storage space. Of course, the first box body 2021 and the second box body 2022 can be in various shapes, such as cylinder, cuboid, etc.

[0076] In order to improve the sealing performance after the first box body 2021 and the second box body 2022 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 2021 and the second box body 2022.

[0077] Assuming that the first box body portion 2021 covers the top of the second box body portion 2022, the first box body portion 2021 can also be called an upper box cover, and the second box body portion 2022 can also be called a lower box cover.

[0078] In battery 2, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell system is housed within the housing 202. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a hybrid connection to form a battery module 201, and then multiple battery modules 201 can be connected in series, in parallel, or in a hybrid connection to form a single system, which is then housed within the housing 202.

[0079] Figure 3 A schematic structural diagram of a battery module 201 according to an embodiment of the present application is shown.

[0080] In some embodiments, as Figure 2 and Figure 3 As shown, there are multiple battery cells 3, which are first connected in series, in parallel, or in series to form a battery module 201. The multiple battery modules 201 are then connected in series, in parallel, or in series to form a whole, and are accommodated in the box 202.

[0081] The multiple battery cells 3 in the battery module 201 can be electrically connected via a busbar component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 3 in the battery module 201 .

[0082] In this application, the battery cells 3 may include lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, and the embodiments of this application are not limited to this. The battery cells 3 may be cylindrical, flat, rectangular, or other shapes, and the embodiments of this application are not limited to this. However, for the sake of simplicity, the following embodiments use square battery cells as an example.

[0083] Figure 4 This is a schematic diagram of the structure of a battery cell 3 provided in some embodiments of the present application. A battery cell 3 is the smallest unit that makes up a battery. Figure 4 The battery cell 3 includes a top cover assembly 6, a shell 4 and an electrode assembly 5.

[0084] The electrode assembly 5 is a component in the battery cell 3 where electrochemical reactions occur. One or more electrode assemblies 5 may be contained in the housing 4. The electrode assembly 5 is mainly formed by winding or stacking electrode sheets, which are divided into positive electrode sheets and negative electrode sheets, and a separator is usually provided between the positive electrode sheets and the negative electrode sheets. The parts of the positive electrode sheets and the negative electrode sheets with active materials constitute the electrode body, and the parts of the positive electrode sheets and the negative electrode sheets without active materials each constitute the electrode tab. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0085] The housing 4 is a component used to cooperate with the top cover assembly 6 to form the internal environment of the battery cell 3, wherein the formed internal environment can be used to accommodate the electrode assembly 5, electrolyte (not shown in the figure), and other components. The housing 4 and the top cover assembly 6 can be independent components. An opening can be provided on the housing 4, and the internal environment of the battery cell 3 is formed by covering the opening with the top cover assembly 6. Alternatively, the top cover assembly 6 and the housing 4 can be integrated. Optionally, the top cover assembly 6 and the housing 4 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 4 needs to be encapsulated, the top cover assembly 6 is then closed over the housing 4. The housing 4 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, a hexagonal prism, etc. The shape of the housing 4 can be determined according to the specific shape and size of the electrode assembly 5. The housing 4 can be made of various materials, and optionally, the housing 4 can be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0086] See also Figure 5 、 Figure 6 and Figure 7 , Figure 5 1 is a schematic structural diagram of a battery provided in one embodiment of the present application; Figure 6 is an exploded view of a battery provided in one embodiment of the present application; Figure 7 yes Figure 5 Cross-section view at AA in the middle.

[0087] First, as Figures 5 to 7 As shown, the present application provides a battery 2, which includes a case 202, a battery cell 3 and a blocking structure 8. The case 202 has a accommodating cavity; a battery cell group 7 is located in the accommodating cavity, and the battery cell group 7 includes at least one column of multiple battery cells 3 arranged along a first direction X. The battery cell 3 includes a first wall 31 and a second wall 32 that are connected and intersecting. The first wall 31 is provided with a pressure relief mechanism, and a gap 203 is provided between the second wall 32 and the case 202; at least a portion of the blocking structure 8 is located in the gap 203 to prevent at least a portion of the emissions discharged through the pressure relief mechanism from entering the gap 203.

[0088] In the embodiment of the present application, the battery 2 includes a case 202, a battery cell 3 and a blocking structure 8, the case 202 has a accommodating cavity; the battery cell group 7 is located in the accommodating cavity, the battery cell group 7 includes at least one row of multiple battery cells 3 arranged along the first direction X, the battery cell 3 includes a first wall 31 and a second wall 32 that are connected and intersecting, the first wall 31 is provided with a pressure relief mechanism, and a gap 203 is provided between the second wall 32 and the case 202. When the battery 2 thermally runs away, high-temperature ejecta is ejected from the pressure relief mechanism of the first wall 31, and at least part of the blocking structure 8 is located in the gap 203 to prevent at least part of the emissions discharged through the pressure relief mechanism from entering the gap 203, so as to improve the risk that the high-temperature ejecta damages the insulating film of the second wall 32. The high-temperature ejecta overlaps the second wall 32 and the inner wall of the case 202, causing an internal short circuit in the battery 2, aggravating the risk of thermal runaway of the battery 2, and improving the reliability of the battery 2.

[0089] Specifically, the box body 202 includes a receiving cavity, and the battery cell group 7 is assembled in the receiving cavity. The battery cell group 7 includes at least one column of multiple battery cells 3 arranged along the first direction X.

[0090] The battery cell 3 includes a first wall 31 and a second wall 32 that are connected and intersecting. For example, when the battery cell 3 is a cylindrical battery cell 3, the first wall 31 is one of the end wall and the side wall of the top or bottom thereof, and the second wall 32 is the other of the end wall and the side wall of the top or bottom thereof. When the battery cell 3 is a square shell battery cell 3, the first wall 31 and the second wall 32 are two walls that are connected and intersecting.

[0091] A pressure relief mechanism is provided on the first wall 31 , and is used to release the internal pressure of the battery 2 to the outside when the internal temperature or pressure of the battery 2 exceeds a threshold. Exemplarily, the pressure relief mechanism is a pressure relief valve, an explosion-proof valve, or a balancing valve.

[0092] The surface of the battery cell 3 is covered with an insulating film, which is used to insulate adjacent battery cells 3 and between the battery cell 3 and the box body 202. There is a gap 203 between the battery cell 3 and the box body 202. When the battery 2 thermally runs away, the high-temperature substance released through the pressure relief mechanism enters the gap 203, and the high-temperature substance will melt the insulating film, causing the battery cell 3 and the box body 202 to directly overlap.

[0093] Therefore, in the embodiment of the present application, a blocking structure 8 is provided, with at least a portion of the blocking structure 8 located within the gap 203, to prevent at least a portion of the exhaust discharged through the pressure relief mechanism from entering the gap 203. Specifically, one end of the blocking structure 8 is connected to the inner surface of the housing 202 opposing the second wall 32, and the other end thereof extends into the gap 203; or one end of the blocking structure 8 is connected to the inner surface of the housing 202 opposing the first wall 31, and the other end thereof extends into the gap 203; or one end of the blocking structure 8 is connected to the battery pack 7, and the other end thereof extends into the gap 203.

[0094] Optionally, the blocking structure 8 is integrally formed and extends along the first direction X; or the blocking structure 8 is formed by connecting a plurality of substructures arranged in the first direction X.

[0095] Optionally, the barrier structure 8 is made of an insulating material that has good flame retardancy and high temperature resistance, so as to increase the service life of the barrier structure 8 .

[0096] Optionally, the blocking structure 8 completely isolates the gap 203 and the pressure relief mechanism to enhance the blocking effect of the blocking structure 8 on high-temperature substances.

[0097] In some embodiments, as Figure 5 and Figure 6 As shown, the blocking structure 8 is connected to the outer surface of the battery cell 3 and extends from the outer surface of the battery cell 3 to the gap 203 .

[0098] In these embodiments, the blocking structure 8 is connected to the outer surface of the battery cell 3 and extends from the outer surface of the battery cell 3 to the gap 203, reducing the distance between the blocking structure 8 and the pressure relief structure, improving the blocking effect of the blocking structure 8, and can also reduce the size of the blocking structure 8 and reduce the weight of the battery 2.

[0099] The blocking structure 8 is connected to the outer surface of the battery cell 3 by abutment or adhesion. The blocking structure 8 is connected to the first wall 31 and / or the second wall 32 of the battery cell 3. When the battery cell 3 is connected to the first wall 31, one end of the blocking structure 8 is connected to the first wall 31, and the other end extends into the gap 203. At this time, the portion of the blocking structure 8 in contact with the first wall 31 and the portion of the first wall 31 extending into the gap 203 both serve to isolate the pressure relief mechanism from the gap 203. When the battery cell 3 is connected to the second wall 32, one end of the blocking structure 8 is connected to the first wall 31, and the other end extends into the gap 203. At this time, while the blocking structure 8 serves to isolate the pressure relief mechanism from the gap 203, it also reduces the size of the blocking structure 8 and reduces the weight of the battery 2.

[0100] Optionally, when the battery cell 3 is connected to the first wall 31, the blocking structure 8 is arranged between the pressure relief mechanism and the gap 203, so as to reduce the size of the blocking structure 8 while enhancing the blocking effect of the blocking structure 8 as a whole; or when the battery cell 3 is connected to the first wall 31, part of the blocking structure 8 is arranged on the side of the pressure relief mechanism away from the gap 203, and the blocking structure 8 and the pressure relief structure are staggered. The blocking structure 8 will not block the pressure relief structure. At this time, the contact area between the blocking structure 8 and the battery cell group 7 or the box body 202 is large, and the connection between the blocking structure 8 and the box body 202 is stable.

[0101] See also Figure 8 , Figure 8 yes Figure 7 Schematic diagram of the enlarged structure at point B in the middle.

[0102] In some embodiments, as Figures 6 to 8 As shown, the blocking structure 8 includes a first segment 81 and a second segment 82 connected to each other, the box body 202 includes a first box wall 2023 , the first segment 81 is arranged between the first wall 31 and the first box wall 2023 , and the second segment 82 extends into the gap 203 .

[0103] In these embodiments, the blocking structure 8 includes a first segment 81 and a second segment 82 that are interconnected. The box body 202 includes a first box wall 2023. The first segment 81 is arranged between the first wall 31 and the first box wall 2023. The first segment 81 serves to enhance the rigidity of the battery 2 and improve the deformation resistance of the box body 202. The second segment 82 extends into the gap 203 and serves to prevent high-temperature ejecta from entering the gap 203, thereby improving the reliability of the battery 2.

[0104] The first segment 81 is disposed between the first wall 31 and the first box wall 2023 . The first segment 81 extends along the first direction X. The first segment 81 can enhance the rigidity of the battery 2 and the deformation resistance of the first box wall 2023 .

[0105] Optionally, the first segment 81 is provided between the pressure relief mechanism and the gap 203 , and the first segment 81 serves to prevent high-temperature ejecta from entering the gap 203 .

[0106] The second segment 82 extends from the edge of the first wall 31 into the gap 203, reducing the size of the second segment 82; or a portion of the second segment 82 extends into the gap 203, and another portion of the second segment 82 contacts the first wall 31, so as to enhance the supporting effect of the blocking structure 8 on the battery cell group 7.

[0107] Optionally, the blocking structure 8 includes a first segment 81 and a second segment 82, and the first segment 81 and the second segment 82 are integrally formed to improve the structural strength of the blocking structure 8. Alternatively, the first segment 81 is welded or bolted to the second segment 82, so that the blocking structure 8 can be applied to battery boxes 202 of various specifications.

[0108] In some embodiments, as Figures 7 and 8 As shown, the box body 202 further includes a second box wall 2024 connected to the periphery of the first box wall 2023 , and a gap 203 is formed between the second box wall 2024 and the second wall 32 .

[0109] In these embodiments, the box body 202 also includes a second box wall 2024 connected to the periphery of the first box wall 2023, and a gap 203 is formed between the second box wall 2024 and the second wall 32, thereby reducing the distance between the gap 203 and the first wall 31. While the blocking structure 8 has the effect of blocking high-temperature ejecta from entering the gap 203, the size of the second segment 82 is reduced, thereby reducing the processing difficulty of the blocking structure 8.

[0110] Optionally, one end of the blocking structure 8 is connected to the first wall 31 , and the other end thereof abuts against the second box wall 2024 , so that the blocking structure 8 completely separates the interval and the pressure relief structure, preventing high-temperature ejecta from entering the gap 203 .

[0111] See also Figure 9 , Figure 9 It is a partial structural diagram of a battery provided in one embodiment of the present application.

[0112] In some embodiments, as Figure 6 、 Figure 8 and Figure 9 As shown, the battery 2 also includes an electrical connection structure 92, which is connected to one end of the battery cell group 7 in the first direction X, and the electrical connection structure 92 extends toward the other end of the battery cell group 7 in the first direction X. The electrical connection structure 92 includes an extension segment 921 located in the gap 203, and the extension segment 921 is connected to the second segment 82.

[0113] In these embodiments, the battery 2 also includes an electrical connection structure 92, which is connected to one end of the battery cell group 7 in the first direction X, and the electrical connection structure 92 extends toward the other end of the battery cell group 7 in the first direction X. The electrical connection structure 92 includes an extension segment 921 located in the gap 203 to rationally utilize the internal space of the box 202 and improve the utilization rate of the internal space of the box 202. The extension segment 921 is connected to the second segment 82 to improve the stability of the electrical connection structure 92.

[0114] Optionally, the electrical connection structure 92 may be a connecting cable or a connecting piece. For example, the connection structure may be a precursor copper bar connected between the high voltage box and the precursor connector, and the high voltage box and the precursor connector 84 are respectively arranged at both ends of the accommodating cavity in the first direction X.

[0115] The extending segment 921 of the electrical connection structure 92 is accommodated in the gap 203 and extends along the first direction X. The extending segment 921 is connected to the second segment 82 so that the electrical connection structure 92 is fixed by the second segment 82 .

[0116] The electrical connection structure 92 and the second segment 82 can be connected by bonding, with a colloid provided between the electrical connection structure 92 and the second segment 82; or a plurality of through holes are provided at intervals on the second segment 82, and the extension segment 921 is passed through each through hole, so that the second segment 82 has the effect of fixing and supporting the extension segment 921; or a connecting piece 84 is provided on the second segment 82, and is connected to the electrical connection structure 92 through the connecting piece 84.

[0117] Optionally, the extension segment 921 is arranged between the second segment 82 and the first box wall 2023, and the second segment 82 is connected to the end of the first segment 81 facing away from the first box wall 2023, thereby increasing the setting space of the extension segment 921 and reducing the assembly difficulty of the extension segment 921 and the second segment 82.

[0118] See also Figure 10 and Figure 11 , Figure 10 is a top view of a blocking structure of a battery provided in one embodiment of the present application; Figure 11 yes Figure 10 Cross-sectional view at CC.

[0119] In some embodiments, as Figure 10 and Figure 11 As shown, the second segment 82 is connected to the first segment 81 and extends along the second direction Y toward the gap 203 . The second segment 82 is flat to reduce the processing difficulty of the blocking structure 8 . The electrical connection structure 92 is connected to the second segment 82 .

[0120] See also Figure 12 and Figure 13 , Figure 12 is a top view of a blocking structure of a battery provided in another embodiment of the present application; Figure 13 yes Figure 12 Cross-sectional view at DD in the middle.

[0121] In some embodiments, as Figure 8 、 Figure 12 and Figure 13As shown, part of the second segment 82 located in the gap 203 is bent in a direction away from the first box wall 2023 to form an accommodating space 821 between the second segment 82 and the first box wall 2023, and at least part of the extended segment 921 is arranged in the accommodating space 821.

[0122] In these embodiments, part of the second segment 82 located in the gap 203 is bent in a direction away from the first box wall 2023 to form an accommodating space 821 between the second segment 82 and the first box wall 2023, and at least part of the extended segment 921 is arranged in the accommodating space 821. The accommodating space 821 formed by bending increases the distance between the second segment 82 and the first box wall 2023, reduces the difficulty of matching the extended segment 921 and the second segment 82, and at least part of the extended segment 921 is arranged in the accommodating space 821, so that the second segment 82 has a limiting effect on the extended segment 921 through the wall of the accommodating space 821.

[0123] The portion of the second segment 82 located in the gap 203 is bent in a direction away from the first box wall 2023. Specifically, the middle area of the portion of the second segment 82 located in the gap 203 is bent away from the first box wall 2023 to form a groove-shaped accommodating space 821; or the portion of the second segment 82 located in the gap 203 is bent toward one end of the second box wall 2024 away from the first box wall 2023 to form a stepped groove-shaped accommodating space 821.

[0124] The size of the accommodation space 821 can be flexibly designed, but at least part of the connection structure can be placed in the accommodation space 821, and the wall of the accommodation space 821 can limit the extension segment 921. In addition, the accommodation space 821 can be used to accommodate more high-temperature substances in the event of thermal runaway.

[0125] In some embodiments, as Figure 8 As shown, the blocking structure 8 further includes a connecting member 84 located in the accommodating space 821 , one end of the connecting member 84 is connected to the second segment 82 , and the other end of the connecting member 84 is connected to the extending segment 921 .

[0126] In these embodiments, the blocking structure 8 further includes a connector 84 located in the accommodating space 821 , and the extension segment 921 is connected to the second segment 82 via the connector 84 to improve the connection reliability between the second segment 82 and the extension segment 921 .

[0127] Optionally, the connecting member 84 is a cable tie, one end of the connecting member 84 is connected to the second segment 82, and the other end of the connecting member 84 is sleeved on the extension segment 921; or the connecting member 84 is a buckle, and a card slot is provided on the extension segment 921, and the connecting member 84 and the second segment 82 are connected by the connecting member 84.

[0128] Optionally, one end of the connecting member 84 is connected to one end of the accommodating space 821 toward the first box wall 2023 , and the other end of the connecting member 84 is connected toward the first box wall 2023 , so that the connecting member 84 can well fix the extension segment 921 in the accommodating space 821 .

[0129] In some embodiments, as Figures 6 to 8 As shown, the battery 2 further includes a heat exchange structure 91 for regulating the temperature of the battery cell 3 . At least a portion of the heat exchange structure 91 is accommodated in the gap 203 and is located on the side of the second segment 82 away from the first box wall 2023 .

[0130] In these embodiments, the battery 2 also includes a heat exchange structure 91, which is used to regulate the temperature of the battery cell 3. At least part of the heat exchange structure 91 is accommodated in the gap 203, and at least part of the heat exchange structure 91 is located on the side of the second segment 82 away from the first box wall 2023, so that when the battery 2 thermally runs away, the second segment 82 can be used to prevent high-temperature ejecta from contacting the heat exchange structure 91, thereby improving the service life of the heat exchange structure 91.

[0131] Battery 2 also includes a heat exchange structure 91, which is used to regulate the temperature of Battery 2. A portion of the heat exchange structure 91 is housed within gap 203. During thermal runaway of Battery 2, if some of the high-temperature ejecta spreads to gap 203 and drips onto the heat exchange structure 91, the heat exchange structure 91 may melt, further exacerbating the thermal runaway of Battery 2. Therefore, in this embodiment of the present application, at least a portion of the heat exchange structure 91 is positioned on the side of the second segment 82 facing away from the first wall 2023. This means that the second segment 82 separates the pressure relief mechanism from at least a portion of the heat exchange structure 91, preventing direct contact between the high-temperature ejecta and the heat exchange structure 91, thereby increasing the service life of the heat exchange structure 91.

[0132] In some embodiments, as Figures 6 to 8 As shown, the heat exchange structure 91 includes a heat exchange body 911 and a heat exchange pipeline 912. The heat exchange body 911 is thermally connected to the battery cell 3. The heat exchange pipeline 912 is connected to the heat exchange body 911 and the external environment. At least part of the heat exchange pipeline 912 is located on the side of the second segment 82 away from the first box wall 2023.

[0133] In these embodiments, the heat exchange structure 91 includes a heat exchange body 911 and a heat exchange pipeline 912. The heat exchange body 911 and the battery cell 3 are thermally connected so that the heat exchange body 911 can be used to regulate the temperature of the battery cell 3. The heat exchange pipeline 912 is connected to the heat exchange body 911 and the external environment. At least part of the heat exchange pipeline 912 is located on the side of the second segment 82 away from the first box wall 2023, so that the second segment 82 can replace the heat pipeline 912 to block at least part of the high-temperature ejecta when the battery 2 thermally runs away, thereby improving the service life of the heat exchange structure 91.

[0134] The heat exchange structure 91 includes a heat exchange body 911 and a heat exchange pipeline 912. The heat exchange body 911 is in contact with the battery cell 3 or the heat exchange body 911 is in contact with the battery cell 3 through a thermally conductive adhesive. The heat exchange body 911 is used to adjust the temperature of the battery cell 3. The heat exchange body 911 contains a heat exchange medium, which circulates with the outside world through the heat exchange loop.

[0135] The heat exchange line 912 extends within the gap 203 to rationally utilize the internal space of the accommodating cavity. Generally, the heat exchange line 912 is made of non-metallic material. Therefore, at least part of the heat exchange line 912 is located on the side of the second segment 82 away from the first box wall 2023. When the battery 2 thermally runs away, the second segment 82 is used to block the high-temperature ejecta from contacting the heat exchange management, thereby extending the service life of the heat exchange line 912.

[0136] Optionally, the second segment 82 completely blocks the gap 203 and the pressure relief structure, so that the second segment 82 completely blocks the pressure relief structure and the heat exchange pipeline 912 .

[0137] Optionally, the heat exchange structure 91 and the electrical connection structure 92 are respectively arranged on both sides of the second segment 82.

[0138] In some embodiments, as Figure 8 As shown, the first segment 81 includes a weight reduction cavity 811 extending along the first direction X.

[0139] In these embodiments, the first segment 81 includes a weight-reducing cavity 811 extending along the first direction X to reduce the weight of the blocking structure 8, thereby achieving the effect of reducing the overall weight of the battery 2; and when the first box wall 2023 is impacted by external force, the first segment 81 can deform and absorb energy through the weight-reducing cavity 811, thereby improving the protective ability of the blocking structure 8 to the battery cell group 7.

[0140] The weight-reducing cavity 811 may be a through hole that passes through the first segment 81 along the first direction X. The cross-sectional shape of the weight-reducing cavity 811 in the first direction X may be flexibly designed, and for example, the cross-sectional shape may be rectangular or circular.

[0141] In some embodiments, as Figure 8 As shown, the battery 2 further includes a buffer member 93 , which is disposed between the first segment 81 and the first box wall 2023 . The buffer member 93 is configured to be retractable along the thickness direction of the first box wall 2023 .

[0142] In these embodiments, the battery 2 also includes a buffer member 93, which is arranged between the first segment 81 and the first box wall 2023. The buffer member 93 is retractably arranged along the thickness direction of the first box wall 2023. The buffer member 93 can absorb the assembly tolerance between the first segment 81 and the first box wall 2023, thereby reducing the processing difficulty of the battery 2.

[0143] Optionally, the buffer member 93 and the first segment 81 or the first box wall 2023 are bonded together to improve the connection reliability between the buffer member 93 and the first segment 81 or the first box wall 2023 .

[0144] Optionally, the buffer member 93 is a rubber pad or a foam pad.

[0145] Optionally, a fixing groove is provided on the first box wall 2023 , and part of the buffer member 93 is provided in the fixing groove to improve the connection reliability between the buffer member 93 and the first box wall 2023 .

[0146] Optionally, the blocking structure 8 and the buffer member 93 are manufactured integrally to simplify the assembly steps of the box body 202 and the blocking structure 8 .

[0147] See also Figure 14 , Figure 14 Schematic diagram of the blocking structure of a battery provided in one embodiment of the present application.

[0148] In some embodiments, as Figure 6 and Figure 14 As shown, the box body 202 also includes a beam 204 extending along the second direction Y and connected to the inner wall of the box body 202. The two beams 204 are spaced apart in the first direction X. The battery cell group 7 is located between the two beams 204. The two ends of the blocking structure 8 are connected to the two beams 204. The first direction X and the second direction Y intersect.

[0149] In these embodiments, the box body 202 further includes a crossbeam 204 extending along the second direction Y and connected to the inner wall of the box body 202. The two crossbeams 204 are spaced apart in the first direction X. The battery cell group 7 is located between the two crossbeams 204. The two ends of the blocking structure 8 are connected to the two crossbeams 204 to improve the connection reliability between the blocking structure 8 and the box body 202.

[0150] Optionally, a connecting section 85 is provided at the end of the first segment 81 in the first direction X, and the first segment 81 is inscribed in the crossbeam 204 of the box body 202 through the connecting section 85. The connecting section 85 and the first segment 81 are detachably connected, so that the connecting section 85 can be applied to blocking structures 8 of different sizes.

[0151] In some embodiments, as Figure 5 and Figure 6As shown, the battery 2 also includes a pressure strip 94, the two ends of the pressure strip 94 are connected to the two beams 204, multiple battery cell groups 7 are arranged along the second direction Y, the pressure strip 94 connects two adjacent battery cell groups 7, and the blocking structure 8 is connected to the battery cell groups 7 at both ends of the second direction Y.

[0152] In these embodiments, the battery 2 also includes a pressure strip 94, the two ends of which are connected to two cross beams 204, thereby improving the connection reliability between the pressure strip 94 and the box body 202. Multiple battery cell groups 7 are arranged along the second direction Y, and the pressure strip 94 enhances the rigidity of the box body 202. The pressure strip 94 connects two adjacent battery cell groups 7, and the blocking structure 8 is connected to the battery cell groups 7 at both ends of the second direction Y, so that the pressure strip 94 and the blocking structure 8 have a fixing and limiting effect on the battery cell group 7, thereby improving the reliability of the battery 2.

[0153] The pressure strip 94 is arranged between the first box wall 2023 and the battery cell group 7, and the pressure strip 94 is connected to the crossbeam 204 of the box body 202 at both ends in the first direction X. The pressure strip 94 connects adjacent battery cell groups 7, and the pressure strip 94 plays a role in fixing and limiting the battery cell group 7.

[0154] The blocking structure 8 is connected to the battery cell group 7 at both ends in the second direction Y. While the blocking structure 8 fixes the battery cell group 7, the blocking structure 8 at both ends also has the effect of preventing the high-temperature ejecta from spreading to the gap 203 on either side of the battery 2 in the second direction Y.

[0155] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery provided by any of the above-mentioned embodiments of the first aspect.

[0156] In some embodiments, as Figures 1 to 14As shown, the battery 2 includes a box body 202, a battery cell 3 and a blocking structure 8. The box body 202 has a receiving cavity; the battery cell group 7 is located in the receiving cavity, and the battery cell group 7 includes at least one row of multiple battery cells 3 arranged along the first direction X. The battery cell 3 includes a first wall 31 and a second wall 32 that are connected and intersecting. The first wall 31 is provided with a pressure relief mechanism; the blocking structure 8 includes a first segment 81 and a second segment 82 that are connected to each other. The first segment 81 includes a weight reduction cavity 811 extending along the first direction X. The box body 202 includes a first box wall 2023. The first segment 81 is provided between the first wall 31 and the first box wall 2023. The box body 202 also includes a pressure relief mechanism connected to the first box wall 2023. The second box wall 2024 on the peripheral side forms a gap 203 between the second box wall 2024 and the second wall 32, and the second segment 82 extends into the gap 203 to prevent at least part of the emissions discharged through the pressure relief mechanism from entering the gap 203; the battery 2 also includes an electrical connection structure 92, which is connected to one end of the battery cell group 7 in the first direction X, and the electrical connection structure 92 extends toward the other end of the battery cell group 7 in the first direction X, and the electrical connection structure 92 includes an extension segment 921 located in the gap 203, the extension segment 921 is connected to the second segment 82, and the portion of the second segment 82 located in the gap 203 is bent in a direction away from the first box wall 2023 to be in the second An accommodating space 821 is formed between the segment 82 and the first box wall 2023, and at least a portion of the extended segment 921 is disposed in the accommodating space 821. The blocking structure 8 further includes a connector 84 located in the accommodating space 821, one end of the connector 84 being connected to the second segment 82, and the other end of the connector 84 being connected to the extended segment 921. The battery 2 further includes a heat exchange structure 91, which includes a heat exchange body 911 and a heat exchange pipe 912. The heat exchange body 911 is heat-conductingly connected to the battery cell 3, and the heat exchange pipe 912 is connected to the heat exchange body 911 and the external environment. At least a portion of the heat exchange pipe 912 is located on the side of the second segment 82 away from the first box wall 2023. The battery 2 further includes a buffer 93. The buffer member 93 is arranged between the first segment 81 and the first box wall 2023, and the buffer member 93 is retractable along the thickness direction of the first box wall 2023. The box body 202 also includes a beam 204 extending along the second direction Y and connected to the inner wall of the box body 202. The two beams 204 are spaced apart in the first direction X. The battery cell group 7 is located between the two beams 204. The two ends of the blocking structure 8 are connected to the two beams 204. The battery 2 also includes a pressure strip 94. The two ends of the pressure strip 94 are connected to the two beams 204. Multiple battery cell groups 7 are arranged along the second direction Y. The pressure strip 94 connects two adjacent battery cell groups 7. The blocking structure 8 is connected to the battery cell groups 7 at both ends of the second direction Y.

[0157] In the embodiment of the present application, the battery 2 includes a case 202, a battery cell 3 and a blocking structure 8, the case 202 has a accommodating cavity; the battery cell group 7 is located in the accommodating cavity, the battery cell group 7 includes at least one row of multiple battery cells 3 arranged along the first direction X, the battery cell 3 includes a first wall 31 and a second wall 32 that are connected and intersecting, the first wall 31 is provided with a pressure relief mechanism, and a gap 203 is provided between the second wall 32 and the case 202. When the battery 2 thermally runs away, high-temperature ejecta is ejected from the pressure relief mechanism of the first wall 31, and at least part of the blocking structure 8 is located in the gap 203 to prevent at least part of the emissions discharged through the pressure relief mechanism from entering the gap 203, so as to improve the risk that the high-temperature ejecta damages the insulating film of the second wall 32. The high-temperature ejecta overlaps the second wall 32 and the inner wall of the case 202, causing an internal short circuit in the battery 2, aggravating the risk of thermal runaway of the battery 2, and improving the reliability of the battery 2.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery, characterized in that: include: A box body having a receiving cavity; a battery cell group located in the accommodating cavity, the battery cell group comprising at least one column of multiple battery cells arranged along a first direction, the battery cells comprising a first wall and a second wall connected and intersecting, the first wall being provided with a pressure relief mechanism, and a gap being defined between the second wall and the box body; A blocking structure is provided, at least a portion of which is located in the gap to block at least a portion of the exhaust discharged through the pressure relief mechanism from entering the gap.

2. The battery according to claim 1, characterized in that The blocking structure is connected to the outer surface of the battery cell and extends from the outer surface of the battery cell to the gap.

3. The battery according to claim 2, characterized in that The blocking structure includes a first segment and a second segment connected to each other, the box body includes a first box wall, the first segment is arranged between the first wall and the first box wall, and the second segment extends into the gap.

4. The battery according to claim 3, characterized in that The box body further includes a second box wall connected to the periphery of the first box wall, and the gap is formed between the second box wall and the second wall.

5. The battery according to claim 3, characterized in that The battery further includes an electrical connection structure connected to one end of the battery cell group in the first direction and extending toward the other end of the battery cell group in the first direction. The electrical connection structure includes an extension segment located in the gap, and the extension segment is connected to the second segment.

6. The battery according to claim 5, characterized in that The portion of the second segment located in the gap is bent in a direction away from the first box wall to form an accommodating space between the second segment and the first box wall. At least a portion of the extending segment is disposed in the accommodating space.

7. The battery according to claim 6, characterized in that The blocking structure further includes a connecting member located in the accommodating space, one end of the connecting member is connected to the second segment, and the other end of the connecting member is connected to the extending segment.

8. The battery according to any one of claims 3 to 7, characterized in that: The battery further includes a heat exchange structure for regulating the temperature of the battery cells. At least a portion of the heat exchange structure is accommodated in the gap and is located on a side of the second segment away from the first box wall.

9. The battery according to claim 8, characterized in that The heat exchange structure includes a heat exchange body and a heat exchange pipeline. The heat exchange body is thermally connected to the battery cell. The heat exchange pipeline is connected to the heat exchange body and the external environment. At least part of the heat exchange pipeline is located on the side of the second segment away from the first box wall.

10. The battery according to any one of claims 3 to 9, characterized in that: The first segment includes a weight reduction cavity extending along the first direction.

11. The battery according to any one of claims 3 to 10, characterized in that: The battery further includes a buffer member, which is arranged between the first segment and the first box wall, and the buffer member is arranged to be telescopic along the thickness direction of the first box wall.

12. The battery according to any one of claims 2 to 11, characterized in that: The box body also includes a beam extending along the second direction and connected to the inner wall of the box body. The two beams are spaced apart in the first direction. The battery cell group is located between the two beams. The two ends of the blocking structure are connected to the two beams. The first direction and the second direction intersect.

13. The battery according to claim 12, characterized in that The battery further includes a pressure strip, both ends of which are connected to the two beams. The plurality of battery cell groups are arranged along the second direction, the pressure strip connects two adjacent battery cell groups, and the blocking structure is connected to the battery cell groups at both ends in the second direction.

14. An electrical device, characterized in that: A battery comprising any one of claims 1 to 13.

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