Battery, power utilization device and battery assembly method

Abstract

The invention relates to the field of energy storage devices, and provides a battery, a power utilization device and a battery assembly method. The battery comprises a plurality of battery monomers and a box body, and an accommodating cavity for accommodating the battery monomers is formed in the box body; negative pressure is formed in the accommodating cavity, and part of the structure of the box body is attached to the battery monomers under the action of the negative pressure. The battery provided by the embodiment of the invention has relatively high grouping efficiency.

Description

Technical Field

[0001] The present application relates to the field of energy storage devices, and in particular to a battery, an electrical device and a battery assembly method. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] The battery includes a casing and battery cells contained in the casing. Currently, there is much empty space in the casing and the battery assembly efficiency needs to be improved. Summary of the invention

[0004] In view of this, the present application provides a battery, an electrical device and a battery assembly method, which can improve the battery assembly efficiency.

[0005] An embodiment of the first aspect of the present application provides a battery, comprising:

[0006] Multiple battery cells;

[0007] A box body is provided with a receiving cavity therein; the receiving cavity is under negative pressure and a part of the structure of the box body is attached to the battery monomer under the action of the negative pressure.

[0008] The battery provided in the embodiment of the present application includes a box and a plurality of battery cells, wherein a receiving cavity is provided in the box; the receiving cavity is under negative pressure and part of the structure of the box fits the battery cell under the negative pressure. The box can not only provide a receiving space for the battery cell, but also fit the battery cell tightly. Compared with the traditional battery, the battery provided in the embodiment of the present application reduces the space between the box and the battery cell, eliminates at least part of the free space, and improves the battery grouping efficiency; at the same time, part of the structure of the box can be tightly wrapped on the battery cell, and the box and the battery cell can jointly bear the structural strength, thereby improving the overall structural strength of the battery.

[0009] In some embodiments, the box body includes a first part and a second part connected to each other, the first part and the second part enclose the accommodating cavity; the second part is used to support the battery cell, and at least part of the structure of the first part fits against the battery cell under the action of negative pressure.

[0010] By adopting the above technical solution, the second part of the box can stably carry the battery cell, at least part of the structure of the first part can fit on one side of the battery cell, and the first part is tightly wrapped around the battery cell under the action of negative pressure, eliminating at least part of the free space in the box, thereby improving the overall structural strength and grouping efficiency of the battery.

[0011] In some embodiments, the battery also includes a battery management module connected to the plurality of battery cells and a supporting protection structure fixed on the second part, a protective cavity is provided in the supporting protection structure and the battery management module is disposed in the protective cavity, and the first part is also attached to the supporting protection structure.

[0012] By providing a supporting protection structure, when the box is evacuated, the first part can be pressed against the supporting protection structure under the action of negative pressure, thereby preventing the battery management module and the connector from being compressed.

[0013] In some embodiments, the supporting protection structure includes a top plate and at least one side plate connected to the periphery of the top plate, the top plate and the side plate enclose the protective cavity, and at least one side of the protective cavity is open; the side plate is fixedly connected to the second part.

[0014] By adopting the above technical solution, the supporting protection structure can accommodate the battery management module through the protection cavity to prevent the battery management module from being compressed.

[0015] In some embodiments, the side panel has an extension portion, which extends from one end of the side panel away from the top panel toward the outside of the protective cavity. A through hole is provided on the extension portion, and the supporting protection structure is fixedly connected to the second part by a fastener passed through the through hole.

[0016] By adopting the above technical solution, the supporting protection structure has a simple structure and is easy to install. In some embodiments, the first part is a hollow structure with an opening on one side, the first part includes a first bottom wall and a first side wall connected to the first bottom wall, the first bottom wall is arranged opposite to the opening, and at least one of the first bottom wall and the first side wall is a deformable flexible structure.

[0017] By adopting the above technical solution, at least part of the structure of the first part is a flexible structure, which is convenient for deformation and close fitting on the structural parts inside the box.

[0018] In some embodiments, the first part also includes a first flange, which is connected to an end of the first side wall away from the first bottom wall and extends toward the outside of the accommodating cavity. The first flange is fixedly connected to the second part, and the first flange is a flexible structure or a hard structure.

[0019] By adopting the above technical solution, the first part is connected to the second part through the first flange arranged outside the accommodating cavity. The first flange is not easy to deform, which reduces the probability of airtight failure of the box under negative pressure.

[0020] In some embodiments, the battery further includes a gas pressure sensor, and the gas pressure sensor is used to detect the gas pressure in the accommodating cavity.

[0021] By adopting the above technical solution, the battery provided in the embodiment of the present application can detect the gas pressure in the box, which is convenient for judging whether the battery has leakage or thermal runaway, thereby improving the safety of the battery.

[0022] In some embodiments, the battery further comprises an electrical module electrically connected to the battery cell, the electrical module comprising a mounting plate and a connector disposed on the mounting plate;

[0023] The first part is provided with a mounting hole, the mounting plate is fixedly connected to the first part and seals the mounting hole, and one end of the connector is arranged outside the box.

[0024] By adopting the above technical solution, since the connector is arranged on the mounting plate and the mounting plate is fixed at the mounting hole, when the first part is deformed under the action of negative pressure, the connector is not easily compressed, thereby improving the reliability of the connector.

[0025] In some embodiments, the battery further comprises a battery management module, wherein the battery management module is disposed between the mounting plate and the plurality of battery cells;

[0026] The first part is provided with a protruding portion, and the battery management module is arranged inside the protruding portion.

[0027] By adopting the above technical solution, the pressure on the battery management module after the first part is deformed is relatively small, and the performance of the battery management module is not easily affected.

[0028] In some embodiments, a vacuum port is provided on the box body, and the vacuum port is provided on the first part, the second part or the mounting plate.

[0029] By adopting the above technical solution, the location of the vacuum port can be designed according to needs, and vacuuming the box body can be achieved.

[0030] In some embodiments, an explosion-proof valve is provided on the mounting plate, and the vacuum port is provided in the explosion-proof valve.

[0031] By adopting the above technical solution, the vacuum port is arranged in the explosion-proof valve, and there is no need to open an additional vacuum port on the box body, and the vacuum can be directly drawn by using the air release channel of the explosion-proof valve.

[0032] In some embodiments, the battery further includes a wire harness protection structure, wherein a guide cavity for passing a wire harness is provided inside the wire harness protection structure.

[0033] The wire harness protection structure can accommodate the wire harness in the guide cavity, and can organize the wire harness to prevent the wire harness from being entangled; the wire harness protection structure can also protect the wire harness to prevent the first part from directly pressing on the wire harness and causing the wire harness to be broken under pressure.

[0034] In some embodiments, the wiring harness protection structure has a fitting surface and the fitting surface is attached to the battery cell; a wire passing hole communicating with the guide cavity is formed on the fitting surface, and a limiting protrusion is provided on at least one side of the wire passing hole.

[0035] The fitting surface of the wiring harness protection structure is attached to one side of the battery cell through colloid, which is convenient for assembling the wiring harness protection structure; the limiting protrusion is used to stop the wiring harness to prevent the wiring harness from escaping from the guide cavity.

[0036] In some embodiments, the battery further includes a heat insulation layer disposed between the battery cell and an inner surface of the box.

[0037] By adopting the above technical solution, the heat preservation capacity of the box is improved and the influence of the ambient temperature on the battery temperature is reduced.

[0038] An embodiment of the second aspect of the present application provides an electrical device, comprising the battery provided in the first aspect.

[0039] The third aspect of the present application provides a battery assembly method, comprising:

[0040] Provide box;

[0041] Fixing a plurality of battery cells in the receiving cavity of the box body;

[0042] The containing chamber is evacuated, and a part of the structure of the box body is attached to the battery cell under the action of negative pressure.

[0043] The battery assembly method provided in the embodiment of the present application extracts the air in the accommodating cavity by vacuuming, so that part of the structure of the box can be closely attached to the battery cell, reducing the gap between the box and the battery cell, reducing the free space inside the box, and improving the grouping efficiency. In addition, part of the structure of the box is pressed tightly against the battery cell, and the battery cell and the box share the structural strength, which improves the overall structural strength of the battery.

[0044] In some embodiments, the box body includes a first part and a second part connected to each other, the second part is used to support the battery cell, and at least a part of the structure of the first part is attached to the battery cell under the action of negative pressure.

[0045] By adopting the above technical solution, the second part of the box can stably carry the battery cell, at least part of the structure of the first part can fit on one side of the battery cell, and the first part is tightly wrapped around the battery cell under the action of negative pressure, eliminating at least part of the free space in the box and improving the overall structural strength of the battery.

[0046] In some embodiments, the battery further comprises a battery management module connected to the plurality of battery cells and a support protection structure disposed on the second portion, wherein a protection cavity is disposed in the support protection structure;

[0047] The method of fixing the plurality of battery cells in the accommodation cavity comprises:

[0048] Fixing a plurality of the battery cells on the second part, and placing the battery management module in the protective cavity;

[0049] The first part is fixedly connected to the second part.

[0050] By adopting the above technical solution, when the box is vacuumed, the first part can be pressed against the supporting protection structure under the action of negative pressure to prevent the battery management module from being damaged by pressure.

[0051] In some embodiments, after evacuating the receiving chamber, the battery assembly method further includes:

[0052] detecting the gas pressure in the containing chamber;

[0053] The airtightness of the battery is determined based on the change in the gas pressure.

[0054] By adopting the above technical solution, the battery assembly method provided in the embodiment of the present application can conveniently detect the air tightness of the battery with high detection efficiency.

[0055] In some embodiments, after evacuating the receiving chamber, the battery assembly method further includes:

[0056] detecting the gas pressure in the containing chamber;

[0057] Whether thermal runaway occurs in the battery is determined according to the rate of change of the gas pressure.

[0058] By adopting the above technical solution, the battery assembly method provided in the embodiment of the present application can conveniently detect whether thermal runaway occurs in the battery, reduce the probability of thermal runaway spreading, and improve the reliability of the battery.

[0059] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or conventional technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0061] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0062] Figure 2 A three-dimensional schematic diagram of a battery provided in some embodiments of the present application;

[0063] Figure 3 for Figure 2 A partial enlarged view of part A of the battery shown;

[0064] Figure 4 A three-dimensional schematic diagram of a battery before vacuuming provided in some embodiments of the present application;

[0065] Figure 5 for Figure 4 An exploded perspective view of the battery shown;

[0066] Figure 6 for Figure 5 A partial enlarged view of part B of the battery shown;

[0067] Figure 7 A three-dimensional schematic diagram of a support and protection structure provided in some embodiments of the present application;

[0068] Figure 8 for Figure 7 A three-dimensional schematic diagram of the supporting and protecting structure shown in another angle;

[0069] Fig. 9 A three-dimensional schematic diagram of a wire harness and a wire harness protection structure provided in some embodiments of the present application;

[0070] Fig.10 A three-dimensional schematic diagram of a wire harness protection structure provided in some embodiments of the present application;

[0071] Fig.11 A flowchart of a battery assembly method provided for some embodiments of the present application;

[0072] The meanings of the marks in the figure are:

[0073] 1000, vehicle; 100, battery; 200, controller; 300, motor;

[0074] 10. Box body;

[0075] 11. first part; 111. first bottom wall; 112. first side wall; 1121. front panel; 1122. protruding portion; 113. first flange; 101. mounting hole;

[0076] 12. second part; 121. second flange;

[0077] 20. Battery cells;

[0078] 30. Electrical module; 31. Mounting plate; 32. Connector; 33. Converging component; 34. Sampling structure; 35. Explosion-proof valve;

[0079] 40. Thermal insulation layer;

[0080] 50. Battery management module;

[0081] 60. Support and protection structure; 61. Top plate; 62. Side plate; 621. Extension; 6211. Through hole; 63. Protection cavity;

[0082] 70. Wire harness protection structure; 71. Guide cavity; 72. Fitting surface; 721. Wire passing hole; 722. Limiting protrusion; 80. Wire harness. DETAILED DESCRIPTION

[0083] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0084] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0085] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0086] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0087] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0088] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0089] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0090] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0091] The battery includes a casing and battery cells contained in the casing. Currently, there is much empty space inside the casing and the battery assembly efficiency needs to be improved.

[0092] Research has found that there are usually multiple battery cells arranged in a box. In addition, the box also contains structures such as wiring harnesses, which require space to be reserved, resulting in a lot of free space inside the box, which affects the battery grouping efficiency. The ratio of the volume of a battery cell to the overall volume of the battery reflects the battery grouping efficiency.

[0093] In view of this, the embodiments of the present application provide a battery, an electrical device, and a battery assembly method. The battery includes a plurality of battery cells and a box body. The box body is provided with a receiving chamber. The receiving chamber is under negative pressure, and part of the structure of the box body is attached to the battery cell under the negative pressure. In this way, part of the structure of the box body can be attached to the battery cell, reducing the gap between the box body and the battery cell, reducing the free space inside the box body, and improving the grouping efficiency. In addition, part of the structure of the box body is pressed against the battery cell, and the battery cell and the box body share the structural strength, which improves the overall structural strength of the battery.

[0094] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, 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., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0095] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0096] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0097] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0098] Please refer to Figures 2 to 6 In some embodiments, the battery 100 includes a box body 10 and a plurality of battery cells 20. The box body 10 is provided with a receiving cavity, and the plurality of battery cells 20 are received in the receiving cavity. The receiving cavity is negatively pressurized and part of the structure of the box body 10 is attached to the battery cells 20 under the negative pressure.

[0099] The box body 10 is used to provide a storage space for the battery cells. The box body 10 can be in various shapes, such as a cylinder, a cuboid, etc.

[0100] In the battery 100, a plurality of battery cells 20 form a battery cell group. The plurality of battery cells 20 can be connected in series, in parallel or in a mixed connection. A mixed connection means that the plurality of battery cells 20 are both connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by first connecting a plurality of battery cells 20 in series, in parallel or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel or in a mixed connection to form a whole, and then accommodated in the box 10. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component for realizing electrical connection between the plurality of battery cells 20.

[0101] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0102] The battery cell 20 includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode sheet and a negative electrode sheet. The battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode collector, the positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer, and the positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode collector, the negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer, and the negative electrode collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode collector may be copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current can pass without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0103] The electrode assembly may further include an isolation membrane, and the material of the isolation membrane may be PP (polypropylene) or PE (polyethylene) or the like.

[0104] The negative pressure in the accommodating cavity of the case 10 means that the pressure in the accommodating cavity is less than the atmospheric pressure, and the accommodating cavity is negative pressure relative to the atmospheric pressure. When assembling the battery 100, multiple battery cells 20 can be fixed in the accommodating cavity first, and then the accommodating cavity is made negative pressure by evacuating the case 10, and the partial structure or the whole structure of the case 10 is tightly fitted to the battery cell 20 under the action of negative pressure. Part of the structure of the case 10 can be made of a material with a certain degree of flexibility, so that the partial structure of the case 10 is fitted to the battery cell 20. Part of the structure of the case 10 is also fitted to other structural parts in the case. For example, the case 10 is also provided with structural parts such as wiring harnesses and converging parts, and part of the structure of the case 10 is also fitted to structural parts such as wiring harnesses and converging parts. Part of the structure of the box 10 functions like a strap, which can bind the battery cells and other structural parts together. The box 10 can not only provide a storage space for the battery cells, but also fit and fix the battery cells, thereby reducing the space between the box 10 and the battery cells 20 and improving the grouping efficiency of the battery 100. Part of the structure of the box 10 is in close contact with the structural parts inside the box 10, which can increase the safety gap with the entire vehicle.

[0105] The battery 100 provided in the embodiment of the present application includes a housing 10 and a plurality of battery cells 20. The housing 10 is provided with a receiving cavity; the receiving cavity is negatively pressurized and part of the structure of the housing 10 is attached to the battery cell 20 under the negative pressure. The housing 10 can not only provide a receiving space for the battery cell 20, but also attach to the battery cell 20. Compared with the traditional battery, the battery 100 provided in the embodiment of the present application reduces the space between the housing 10 and the battery cell 20, eliminates at least part of the free space, and improves the grouping efficiency of the battery 100; at the same time, part of the structure of the housing 10 can be tightly wrapped on the battery cell 20, and the housing 10 and the battery cell 20 can jointly bear the structural strength, thereby improving the overall structural strength of the battery 100 without the need to set up more additional reinforcement structures.

[0106] In addition, the existing battery case has a lot of free air, which is prone to condensation, and air convection will also lead to poor thermal insulation of the battery; the case 10 provided in the embodiment of the present application is in a vacuum state and can only transfer heat by radiation, which has a better thermal insulation effect and improves the endurance of the electric vehicle; and, since there is no free air in the case 10, the problem of condensation easily generated in the battery 100 is also solved, thereby reducing sampling abnormalities, insulation failure, corrosion and other problems caused by condensation.

[0107] At the same time, due to the negative pressure inside the box 10, the box 10 will not bulge or make abnormal noises, which solves the problem in the prior art that the box 10 is prone to interfere with the vehicle frame; part of the structure of the box 10 fits tightly onto the battery cells 20 and other structural parts inside the box 10, and the structural parts inside the box 10 are not prone to relative movement and wear problems, thereby reducing the probability of problems such as short circuits, and reducing the use of anti-wear materials and costs.

[0108] In some embodiments, the box body 10 includes a first part 11 and a second part 12 connected to each other, and the first part 11 and the second part 12 can enclose a accommodating cavity; the second part 12 is used to support the battery cell 20, and at least part of the structure of the first part 11 is attached to the battery cell 20 under the action of negative pressure.

[0109] Optionally, the first part 11 is a hollow structure, and the internal space of the first part 11 can be used to accommodate the battery cells 20; one side of the first part 11 is open, and the open side of the first part 11 covers the second part 12, so that the first part 11 and the second part 12 can enclose a receiving cavity, and multiple battery cells 20 are accommodated in the receiving cavity. The first part 11 can also be other structures, such as a plate-like structure.

[0110] The second portion 12 may be a hollow structure with one side open, or the second portion 12 may be in a plate shape, as long as the second portion 12 can fix the battery cell 20 .

[0111] By adopting the above technical solution, the second part 12 of the box body 10 can stably support the battery cell 20, and the first part 11 can be covered on the battery cell 20, which can not only ensure the structural stability of the battery 100, but also eliminate at least part of the free space in the box body 10.

[0112] Please refer to Figure 2 , Figures 5 to 8 In some embodiments, the battery 100 also includes a battery management module 50 and a supporting protection structure 60, the supporting protection structure 60 is fixed on the second part 12, a protective cavity 63 is provided in the supporting protection structure 60 and the battery management module 50 is disposed in the protective cavity 63, and the first part 11 is attached to the supporting protection structure 60.

[0113] The support protection structure 60 is arranged adjacent to the mounting plate 31 , and is used to protect the battery management module 50 and the connector 32 that are arranged inside the box body 10 , so as to prevent the first part 11 from directly pressing on the battery management module 50 and the connector 32 .

[0114] By providing the supporting protection structure 60 , when the box body 10 is evacuated, the first portion 11 can be pressed against the supporting protection structure 60 under the action of negative pressure, thereby preventing the battery management module 50 and the connector 32 from being compressed.

[0115] In some embodiments, the supporting protection structure 60 includes a top plate 61 and at least one side plate 62 connected to the periphery of the top plate 61, the top plate 61 and the side plate 62 form a protective cavity 63, and the side plate 62 is fixedly connected to the second part 12; at least one side of the protective cavity 63 is open to accommodate the battery management module 50.

[0116] Optionally, the supporting protection structure 60 is open on one side toward the second part 12, and the opening is opposite to the top plate 61, and no protection is required here; the supporting protection structure 60 is open on one side along its length direction to facilitate the Rongningga battery management module 50.

[0117] By adopting the above technical solution, the supporting protection structure 60 can accommodate the battery management module 50 through the protection cavity 63 to prevent the battery management module 50 from being compressed.

[0118] Optionally, the side plate 62 has an extension portion 621, which extends from one end of the side plate 62 away from the top plate 61 toward the outside of the protective cavity 63, and the extension portion 621 is provided with a through hole 6211, and the support protection structure 60 is fixedly connected to the second part 12 by a fastener passing through the through hole 6211. In other embodiments, the support protection structure 60 can also be fixed to the second part 12 by means of snap connection or the like.

[0119] The top plate 61 and the side plates 62 may be an integrally formed structure or a split structure that is fixedly connected; the top plate 61 and the side plates 62 may be made of metal, plastic, or the like.

[0120] It can be understood that the supporting and protecting structure 60 is also disposed inside the raised portion of the first part 11 .

[0121] By adopting the above technical solution, the supporting protection structure 60 has a simple structure and is easy to install.

[0122] In some embodiments, the first part 11 is a hollow structure with an opening on one side. The first part 11 includes a first bottom wall 111 and a first side wall 112 connected to the first bottom wall 111. The first bottom wall 111 is arranged opposite to the opening, and at least one of the first bottom wall 111 and the first side wall 112 is a deformable flexible structure.

[0123] The flexible structure refers to a structure that is flexible and suitable for deformation. The flexible structure can be made of flexible materials, for example, the flexible structure can be an aluminum film, a plastic part, etc.

[0124] The first bottom wall 111 and the first side wall 112 may both be flexible structures and integrally formed, so that the first portion 11 is easy to manufacture and has a high structural strength, and the first portion 11 can be completely fitted to the battery cell 20. Optionally, one of the first bottom wall 111 and the first side wall 112 may be a flexible structure and the other may be a hard structure, then at least the flexible structure can fit the battery cell 20, for example, the first side wall 112 is a hard structure, and under the action of negative pressure, the first bottom wall 111 can fit the battery cell 20, reducing the space between the first bottom wall 111 and the battery cell 20; the first side wall 112 is not deformed, avoiding pressure on the components on the side of the protective box 10.

[0125] By adopting the above technical solution, at least part of the structure of the first part 11 is a flexible structure, which is convenient for deformation and close fitting on the structural parts inside the box body 10 .

[0126] like Figure 5 As shown, in some embodiments, the first part 11 also includes a first flange 113, the first flange 113 is connected to one end of the first side wall 112 away from the first bottom wall 111 and extends toward the outside of the accommodating cavity, and the first flange 113 is fixedly connected to the second part 12, and the first flange 113 is a flexible structure or a hard structure.

[0127] The first flange 113 is provided on the circumferential side of the first portion 11 so as to facilitate the sealing connection between the first portion 11 and the second portion 12. The first flange 113 can be vertically connected to the first side wall 112, or can be bent at other angles to be connected to the first side wall 112. A through hole is provided on the first flange 113, and the first flange 113 is fixedly connected to the second portion 12 by a fastener inserted into the through hole. In other embodiments, the first flange 113 can also be fixedly connected to the second portion 12 by welding or other methods.

[0128] Optionally, the first bottom wall 111 and the first side wall 112 are both flexible structures. When the first flange 113 is a hard structure, the first flange 113 is not easily deformed, reducing the probability of airtight failure between the first part 11 and the second part 12. When the first flange 113 is a flexible structure, the first part 11 is an integrally formed structure with a simple structure; since the first flange 113 is arranged on the outside of the accommodating cavity, the probability of airtight failure of the box body 10 can also be reduced.

[0129] By adopting the above technical solution, the first part 11 is connected to the second part 12 through the first flange 113 arranged outside the accommodating cavity. The first flange 113 is not easy to deform, which reduces the probability of airtight failure of the box body 10 under negative pressure.

[0130] In some embodiments, the second part 12 is a hollow structure with one side open, and the periphery of the second part 12 is provided with a second flange 121, and the second flange 121 extends toward the outside of the accommodating cavity; the first flange 113 and the second flange 121 are fixedly connected by fasteners. By providing the second flange 121, it is convenient to achieve the fixed connection between the first part 11 and the second part 12. In other embodiments, the second flange 121 can be omitted, for example, the second part 12 is flat, and the first flange 113 is attached to and fixedly connected to the edge of the second part 12.

[0131] In some embodiments, the battery 100 further includes a gas pressure sensor, which is used to detect the gas pressure in the receiving cavity.

[0132] The gas pressure sensor can be integrated into the battery management module 50 in the box 10, or can be set separately. The gas pressure sensor can detect the gas pressure in the box 10. Since the box 10 is always under negative pressure, the gas pressure sensor can detect whether the gas pressure in the box 10 changes, and then sense whether the battery 100 has gas leakage.

[0133] Based on the detected gas pressure, the battery management module 50 or the external device can determine the air tightness of the battery 100, and can also determine whether thermal runaway occurs inside the battery 100. For example, based on the rate of change of the gas pressure value, it is determined that the battery 100 is leaking or thermal runaway occurs. When the rate of change of the gas pressure value is less than the preset threshold, it is determined that the battery 100 is leaking; when the rate of change of the gas pressure value is greater than the preset threshold, it is determined that the battery 100 is thermal runaway.

[0134] The existing battery 100 cannot detect gas leakage in real time; the battery 100 provided in the embodiment of the present application can detect the gas pressure in the box 10 in real time, which is convenient for judging whether the battery 100 has leakage or thermal runaway, thereby improving the safety of the battery 100; since there is no air in the box 10, the spread of thermal runaway of the battery cell 20 can also be alleviated.

[0135] Please refer to Figure 2 , Figure 5 and Figure 6 In some embodiments, the battery 100 also includes an electrical module 30 electrically connected to the plurality of battery cells 20, the electrical module 30 includes a mounting plate 31 and a connector 32 disposed on the mounting plate 31; a mounting hole 101 is opened on the first part 11, the mounting plate 31 is fixedly connected to the first part 11 and seals the mounting hole 101, and one end of the connector 32 is disposed outside the box body 10.

[0136] The connector 32 is used to electrically connect to a device outside the battery 100, for example, another battery 100 or a high-voltage box. The connector 32 may include a high-voltage connector and a low-voltage connector. The high-voltage connector is used for input and output of current in the battery 100; the low-voltage connector is used for signal transmission. Both the high-voltage connector and the low-voltage connector are arranged outside the box 10 to facilitate connection with external devices. The connector 32 may also include other connectors, such as a heating input connector and a heating output connector for controlling the heating of the battery cell 20.

[0137] The battery 100 further includes a sampling structure 34 , which is connected to the battery cell 20 and is used to sample parameters such as the temperature and voltage of the battery cell 20 , thereby ensuring that the battery 100 can operate in a safe state.

[0138] The mounting hole 101 is disposed on the first side wall 112 , and the mounting plate 31 covers the mounting hole 101 to seal the mounting plate 31 to avoid affecting the air tightness of the battery 100 ; the mounting plate 31 can be fixed to the first portion 11 by fasteners such as screws.

[0139] By adopting the above technical solution, since the connector 32 is arranged on the mounting plate 31 and the mounting plate 31 is fixed at the mounting hole 101, when the first part 11 is deformed under the action of negative pressure, the connector 32 is not easily compressed, thereby improving the reliability of the connector 32.

[0140] In some embodiments, see Figure 6 The battery 100 further includes a battery management module 50 , which is disposed between the mounting plate 31 and the battery cell 20 ; the first portion 11 is provided with a protrusion 1122 , and the battery management module 50 is disposed inside the protrusion 1122 .

[0141] The battery management module 50 may include a battery management system (BMS), a battery management unit (BMU), etc., but is not limited thereto. The first side wall 112 includes a front panel 1121, which is disposed at the end of the battery 100 in the length direction, and the mounting hole 101 is opened on the front panel 1121. Since the first part 11 is a flexible structure, under negative pressure, the first part 11 is deformed and fits the shape of the internal structural parts of the box body 10. Therefore, a protrusion 1122 is formed on the front panel 1121, and the protrusion 1122 is opposite to the battery management module 50 and the rest of the front panel 1121 is fitted to the battery cell 20. The protrusion 1122 can also be set at other positions, which are set according to the position of the battery management module 50.

[0142] By adopting the above technical solution, the pressure on the battery management module 50 by the first part 11 after deformation is relatively small, and the performance of the battery management module 50 is not easily affected.

[0143] Optionally, the support protection structure 60 and the protrusion 1122 of the first part 11 can be set at the same time, and the support protection structure 60 can be accommodated inside the protrusion 1122; in some embodiments, only one of the support protection structure 60 and the protrusion 1122 of the first part 11 can be set, which can also achieve protection of the battery management module 50.

[0144] The battery 100 further includes a busbar 33, which may be a copper bar, and the first portion 11 is attached to the busbar 33. The busbar 33 extends along the arrangement direction of the battery cells 20, one end of the busbar 33 is connected to the output pole of the battery cell 20 group, and the other end is connected to the high-voltage connector. Therefore, the busbar 33 is provided on the side of the battery cell 20, the first portion 11 is attached to the busbar 33 and the battery cell 20, and the first portion 11 is also provided with a protrusion 1122 at a position corresponding to the busbar 33.

[0145] In some embodiments, a vacuum port is provided on the box body 10 , and the vacuum port is provided on the first part 11 , the second part 12 or the mounting plate 31 .

[0146] The vacuum port is used to be connected to a vacuum generating device, so that the box 10 can extract air through the vacuum port. After vacuuming, the vacuum port needs to remain sealed to avoid destroying the vacuum state in the box 10.

[0147] By adopting the above technical solution, the location of the vacuum port can be designed according to needs, and vacuuming the box body 10 can be achieved.

[0148] In some embodiments, an explosion-proof valve 35 is provided on the mounting plate 31 , and a vacuum port is provided in the explosion-proof valve 35 .

[0149] The explosion-proof valve 35 is used to release air when thermal runaway occurs inside the box 10, and a release passage is provided in the explosion-proof valve 35. In this embodiment, the vacuum port is provided in the explosion-proof valve 35, so that there is no need to additionally provide a vacuum port on the box 10, and the release passage of the explosion-proof valve 35 can be directly used for vacuuming, and then the explosion-proof valve 35 is closed to make the explosion-proof valve 35 in a sealed state.

[0150] In some embodiments, the battery 100 further includes a heat insulating layer 40 , which is disposed between the battery cells 20 and the inner surface of the box body 10 .

[0151] The heat insulation layer 40 is used to reduce the heat conduction between the battery cell 20 and the box 10, thereby reducing the heat conduction between the battery cell 20 and the external environment, and improving the heat preservation capacity of the box 10. The heat insulation layer 40 can be attached to the first bottom wall 111 of the first part 11, and can also be attached to the first bottom wall 111 and the first side wall 112 at the same time. In this way, the first part 11 is attached to the heat insulation layer 40 under the action of negative pressure and tightly covers the battery cell 20.

[0152] By adopting the above technical solution, the heat preservation ability of the box body 10 is improved, and the influence of the ambient temperature on the temperature of the battery 100 is reduced.

[0153] Please refer to Figure 2 , Figure 6 , Figure 8 , Fig. 9 In some embodiments, the battery 100 further includes a wire harness protection structure 70 , and a guide cavity 71 for passing the wire harness 80 is provided inside the wire harness protection structure 70 ; the first portion 11 is also attached to the wire harness protection structure 70 .

[0154] Optionally, the wire harness protection structure 70 is in a strip shape, and both ends of the wire harness protection structure 70 are connected along its length direction. The wire harness protection structure 70 can be fixed to the side of the battery cell 20 group facing the mounting plate 31 by gluing. For example, the wire harness protection structure 70 is glued to the side of the battery cell 20 group facing the mounting plate 31. It can be understood that the wire harness protection structure 70 can also be in the box 10 by fasteners or other structures.

[0155] The wire harness protection structure 70 can be used to accommodate a variety of wire harnesses 80. For example, the battery 100 further includes a sampling structure 34 connected to the battery cell 20. The sampling structure 34 is connected to the battery management module 50 via a first wire harness (not shown). The wire harness protection structure 70 can accommodate the first wire harness. It is understood that the battery 100 further includes a variety of wire harnesses 80, all of which can be fixed using the corresponding wire harness protection structure 70.

[0156] The wire harness protection structure 70 can accommodate the wire harness 80 in the guide cavity 71. On the one hand, the wire harness protection structure 70 can organize the wire harness 80 to prevent the wire harness 80 from being entangled. On the other hand, the wire harness protection structure 70 can protect the wire harness 80 to prevent the first part 11 from directly pressing on the wire harness 80 and causing the wire harness 80 to break under pressure.

[0157] In some embodiments, the wiring harness protection structure 70 has a fitting surface 72 and the fitting surface 72 is attached to the battery cell 20 ; a wire hole 721 communicating with the guide cavity 71 is provided on the fitting surface 72 , and a limiting protrusion 722 is provided on at least one side of the wire hole 721 .

[0158] The fitting surface 72 of the harness protection structure 70 is attached to one side of the battery cell 20 by means of colloid, so as to facilitate the assembly of the harness protection structure 70; the limiting protrusion 722 is used to stop the harness 80 and prevent the harness from being separated from the guide cavity 71. Optionally, limiting protrusions 722 are provided on opposite sides of the wire hole 721, and the harness protection structure 70 includes a plurality of pairs of limiting protrusions 722, which are arranged at intervals along the length direction of the harness protection structure 70.

[0159] An embodiment of a second aspect of the present application provides an electrical device, comprising the battery 100 of the first aspect.

[0160] Please refer to Figure 2 , Figure 5 and Fig.11 The embodiment of the third aspect of the present application provides a battery assembly method, comprising:

[0161] Step S110: providing a box body 10 .

[0162] The box body 10 can be in various shapes, such as a cylinder, a cuboid, etc.

[0163] Step S120 : fixing a plurality of battery cells 20 in the receiving cavity of the box body 10 .

[0164] A plurality of battery cells 20 constitute a battery cell group, and the plurality of battery cells 20 may be arranged in a row along a first direction, and a plurality of rows of battery cells 20 may be arranged along a second direction. The battery cells 20 may be bonded to the box body 10 by colloid; or, the plurality of battery cells 20 may be arranged between a pair of crossbeams, and the crossbeams may be fixed to the box body 10 to fix the battery cells 20 to the box body 10. It is understood that the battery cells 20 may also be fixed to the box body 10 by other means.

[0165] Step S130: the containing chamber is evacuated, and a part of the structure of the box body is attached to the battery cell 20 under the negative pressure.

[0166] Specifically, the accommodating chamber is evacuated through the vacuum port on the box body 10, so that the accommodating chamber is under negative pressure, and part of the structure of the box body 10 is attached to the battery cell 20 under the negative pressure. The box body 10 can tightly hold the battery cell 20, and play a role similar to a bandage to fix the battery cell 20. Other structural parts are also provided in the box body 10, and part of the structure of the box body 10 can also be attached to other structural parts in the box body 10, such as the wiring harness 80, the converging component 33, etc. When evacuating, the accommodating chamber can be evacuated through the explosion-proof valve 35 or other vacuum ports.

[0167] The battery assembly method provided in the embodiment of the present application can manufacture the battery 100 provided in any embodiment of the first aspect; the battery assembly method extracts the air in the accommodating cavity by vacuuming, so that part of the structure of the box 10 can be closely attached to the battery cell 20, reducing the gap between the box 10 and the battery cell 20, reducing the free space inside the box 10, and improving the grouping efficiency. In addition, the box 10 is pressed tightly against the battery cell 20, and the battery cell 20 and the box 10 share the structural strength, which improves the overall structural strength of the battery 100.

[0168] The battery assembly method provided in the embodiment of the present application adopts vacuum technology, which can reduce the water content of the air in the box 10 and reduce the generation of condensed water; after vacuuming, there is no air heat convection in the box 10, and heat can only be transferred through radiation, which improves the thermal insulation capacity of the box 10; due to the negative pressure in the accommodating cavity, it is possible to detect whether the box 10 is leaking in real time through the vacuum pressure. The box 10 is close to the internal structural parts and will not be deformed due to changes in air pressure, and then interfere with the vehicle frame, causing abnormal noise or wear; the structural parts in the box 10 are tightly bound together by part of the structure of the box 10 and remain relatively fixed, which reduces the wear of the structural parts and improves the safety of the battery 100.

[0169] In some embodiments, the box body 10 includes a first portion 11 and a second portion 12 connected to each other, the second portion 12 is used to support the battery cell 20, and at least a portion of the structure of the first portion 11 is attached to the battery cell 20 under the action of negative pressure.

[0170] Optionally, the first part 11 is a flexible structure and is easily deformable.

[0171] Optionally, the first portion 11 is a hollow structure with one side open, and the first bottom wall 111 and the first side wall 112 of the first portion 11 are tightly wrapped around the battery cell 20 .

[0172] Optionally, the opening side of the first part 11 covers the battery cell 20 and the second part 12, and the edges of the first part 11 and the second part 12 can be fixedly connected by fasteners such as screws. For example, the first part 11 is provided with a first flange 113, and the second part 12 is provided with a second flange, and the first flange and the second flange are fixedly connected by multiple fasteners. The accommodating cavity surrounded by the first part 11 and the second part 12 is a closed cavity.

[0173] By adopting the above technical solution, the second part 12 of the box body 10 can stably support the battery cell, at least part of the structure of the first part 11 can fit on one side of the battery cell 20, and the first part 11 is tightly wrapped on the battery cell 20 under the action of negative pressure, thereby eliminating at least part of the free space in the box body 10 and improving the overall structural strength of the battery 100.

[0174] Please also refer to Figures 5 to 8 In some embodiments, the battery 100 further includes a battery management module 50 connected to the plurality of battery cells 20 and a support protection structure 60 disposed on the second portion 12 , wherein a protection cavity 63 is disposed in the support protection structure 60 .

[0175] Step S120 fixes the plurality of battery cells 20 in the accommodating cavity of the box body 10 , including: fixing the plurality of battery cells 20 on the second portion 12 , and placing the battery management module 50 in the protective cavity 63 ; and fixing the first portion 11 and the second portion 12 together.

[0176] By adopting the above technical solution, when the box body 10 is evacuated, the first part 11 can be pressed against the supporting protection structure 60 under the action of negative pressure, thereby preventing the battery management module 50 from being damaged by pressure.

[0177] In some embodiments, the battery assembly method further includes: detecting the gas pressure in the accommodation cavity; and determining the air tightness of the battery 100 according to the change in the gas pressure.

[0178] The battery 100 also includes a gas pressure sensor disposed in the box 10. After vacuuming, the gas pressure in the receiving cavity can reach a preset value; then, the gas pressure in the receiving cavity is detected by the gas pressure sensor, and the air tightness of the battery 100 is determined according to the change in gas pressure. If the gas pressure does not change, the air tightness of the battery 100 is qualified; if the change in gas pressure exceeds a certain range, it is determined that the air tightness of the battery 100 is unqualified and there is air leakage in the box 10.

[0179] It can be understood that the air tightness of the battery 100 can be tested not only during the assembly process of the battery 100 , but also during the use of the battery 100 .

[0180] By adopting the above technical solution, the battery assembly method provided in the embodiment of the present application can conveniently detect the air tightness of the battery 100, and the detection efficiency is high.

[0181] In some embodiments, the battery assembly method further includes: detecting the gas pressure in the accommodation cavity; and determining whether thermal runaway occurs in the battery 100 according to the rate of change of the gas pressure.

[0182] Since the rate of change of the gas pressure when the battery 100 leaks is less than the rate of change when the battery 100 is in thermal runaway, the battery assembly method provided in the embodiment of the present application can detect the presence of leakage or thermal runaway in the battery 100 based on the rate of change of the gas pressure. For example, a preset threshold is set, and if the rate of change of the gas pressure is less than the preset threshold, it is judged that the airtightness of the battery 100 is unqualified; if the rate of change of the gas pressure is greater than or equal to the preset threshold, it is judged that the battery 100 is in thermal runaway.

[0183] By adopting the above technical solution, the battery assembly method provided in the embodiment of the present application can conveniently detect whether the battery 100 has thermal runaway, improve the alarm accuracy of thermal runaway, reduce the probability of thermal runaway spreading, and improve the reliability of the battery 100.

[0184] Please refer to Figures 2 to 10 Some embodiments of the present application provide a battery 100, including a plurality of battery cells 20, a box body 10, a confluence component 33 and a sampling structure 34, wherein the sampling structure 34 is disposed on the top of the battery cell 20, and the confluence component 33 is disposed on the side of the battery cell 20, and the accommodating cavity is under negative pressure and the first portion 11 is attached to the battery cell 20, the sampling structure 34 and the confluence component 33 under the action of the negative pressure; the first portion 11 is a flexible structure.

[0185] In some embodiments, the battery 100 also includes a mounting plate 31, a connector 32 and a battery management module 50. The end of the first part 11 is provided with a mounting hole 101 and a protrusion 1122. The mounting plate 31 seals the mounting hole 101, and the battery management module 50 is arranged inside the protrusion 1122.

[0186] In some embodiments, the battery 100 also includes a support protection structure 60 and a wiring harness protection structure 70. The support protection structure 60 is fixed on the second part 12, and the battery management module 50 is arranged in the protective cavity 63 of the support protection structure 60; the wiring harness protection structure 70 is attached to the side wall of the battery cell 20, and the wiring harness is passed through the wiring harness protection structure 70; the first part 11 is attached to the support protection structure 60 and the wiring harness protection structure 70.

[0187] The battery 100 provided in the embodiment of the present application reduces the free space in the housing 10 , thereby improving the grouping efficiency and structural strength of the battery 100 .

[0188] 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 of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A battery, characterized in that: include: Multiple battery cells; A box body is provided with a receiving cavity for receiving the battery monomer; the receiving cavity is under negative pressure and a part of the structure of the box body is attached to the battery monomer under the negative pressure.

2. The battery according to claim 1, characterized in that The box body includes a first part and a second part connected to each other, wherein the first part and the second part enclose the accommodating cavity; the second part is used to carry the battery cell, and at least part of the structure of the first part is attached to the battery cell under the action of negative pressure.

3. The battery according to claim 2, characterized in that The battery also includes a battery management module connected to the plurality of battery cells and a support protection structure fixed on the second part, wherein a protection cavity is provided in the support protection structure and the battery management module is arranged in the protection cavity, and the first part is also attached to the support protection structure.

4. The battery according to claim 3, characterized in that The supporting and protecting structure comprises a top plate and at least one side plate connected to the periphery of the top plate, wherein the top plate and the side plate enclose the protective cavity, and at least one side of the protective cavity is open; the side plate is fixedly connected to the second part.

5. The battery according to claim 4, characterized in that The side plate has an extension portion, which extends from one end of the side plate away from the top plate toward the outside of the protective cavity. A through hole is provided on the extension portion, and the supporting protection structure is fixedly connected to the second part by a fastener passing through the through hole.

6. The battery according to claim 2, characterized in that The first part is a hollow structure with an opening on one side, and the first part includes a first bottom wall and a first side wall connected to the first bottom wall, the first bottom wall is arranged opposite to the opening, and at least one of the first bottom wall and the first side wall is a deformable flexible structure.

7. The battery according to claim 6, characterized in that The first part also includes a first flange, which is connected to an end of the first side wall away from the first bottom wall and extends toward the outside of the accommodating cavity. The first flange is fixedly connected to the second part, and the first flange is a flexible structure or a hard structure.

8. The battery according to any one of claims 1 to 7, characterized in that The battery further comprises a gas pressure sensor, and the gas pressure sensor is used to detect the gas pressure in the accommodating cavity.

9. The battery according to any one of claims 2 to 7, characterized in that The battery further comprises an electrical module electrically connected to the battery cell, the electrical module comprising a mounting plate and a connector disposed on the mounting plate; The first part is provided with a mounting hole, the mounting plate is fixedly connected to the first part and seals the mounting hole, and one end of the connector is arranged outside the box.

10. The battery according to claim 9, characterized in that The battery further comprises a battery management module, wherein the battery management module is arranged between the mounting plate and the plurality of battery cells; The first part is provided with a protruding portion, and the battery management module is arranged inside the protruding portion.

11. The battery according to claim 9, characterized in that The box body is provided with a vacuum port, and the vacuum port is arranged on the first part, the second part or the mounting plate.

12. The battery according to claim 11, characterized in that An explosion-proof valve is arranged on the mounting plate, and the vacuum port is arranged in the explosion-proof valve.

13. The battery according to any one of claims 1 to 7, characterized in that The battery further comprises a wire harness protection structure, wherein a guide cavity for passing the wire harness is provided inside the wire harness protection structure.

14. The battery according to claim 13, characterized in that The wiring harness protection structure has a bonding surface and the bonding surface is attached to the battery cell; The fitting surface is provided with a wire-passing hole communicating with the guide cavity, and at least one side of the wire-passing hole is provided with a limiting protrusion.

15. The battery according to any one of claims 1 to 7, characterized in that The battery further includes a heat insulation layer, which is disposed between the battery cell and the inner surface of the box.

16. An electrical device, characterized in that: Comprising the battery according to any one of claims 1 to 15.

17. A battery assembly method, characterized in that: include: Provide box; Fixing a plurality of battery cells in the receiving cavity of the box body; The containing chamber is evacuated, and a part of the structure of the box body is attached to the battery cell under the action of negative pressure.

18. The battery assembly method according to claim 17, characterized in that: The box body includes a first part and a second part connected to each other, the second part is used to support the battery cell, and at least a part of the structure of the first part is attached to the battery cell under the action of negative pressure.

19. The battery assembly method according to claim 18, characterized in that: The battery further comprises a battery management module connected to the plurality of battery cells and a support and protection structure provided on the second portion, wherein a protection cavity is provided in the support and protection structure; The method of fixing a plurality of battery cells in the accommodating cavity of the box body comprises: Fixing a plurality of the battery cells on the second part, and placing the battery management module in the protective cavity; The first part is fixedly connected to the second part.

20. The battery assembly method according to any one of claims 17 to 19, characterized in that: After the accommodating cavity is evacuated, the battery assembly method further comprises: detecting the gas pressure in the containing chamber; The airtightness of the battery is determined based on the change in the gas pressure.

21. The battery assembly method according to any one of claims 17 to 19, characterized in that: After the accommodating cavity is evacuated, the battery assembly method further comprises: detecting the gas pressure in the containing chamber; Whether thermal runaway occurs in the battery is determined according to the rate of change of the gas pressure.

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