Battery and electric device

Abstract

A battery (10) and an electric device, which belong to the technical field of batteries. The battery (10) comprises: a case (11); a bottom protective plate (13), the bottom protective plate (13) and the case (11) defining an accommodating cavity; a plurality of battery cells (12), which are mounted in the accommodating cavity; and protective structures (14), wherein the protective structures (14) are mounted on an end beam (111) of the case and located between the end beam (111) and the bottom protective plate (13), and the minimum distance between each protective structure (14) and the bottom protective plate (13) is not greater than the minimum distance between each battery cell (12) and the bottom protective plate (13).

Description

Batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number: 202420446298.8 and application date of March 7, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

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

[0004] Batteries are extremely susceptible to damage under bottom scraping or bottom ball conditions. When the impact force of the bottom support is too great, it can directly lead to insulation abnormalities and other problems in the battery. However, the damage caused by the bottom support is at the bottom of the battery and is difficult to detect and is hidden. Although no fire occurred in some bottom support accidents and the electrical devices can continue to work, the battery has been severely deformed. If not discovered and handled in time, the battery and high-voltage devices will continue to be squeezed. After a period of time, the battery may spontaneously combust or even cause serious safety accidents such as explosions.

[0005] Summary of the Invention

[0006] The present application provides a battery and an electrical device to reduce the impact energy received by the first battery cell, provide effective protection for the battery cells at the end, and reduce the difficulty of assembling the protective structure.

[0007] In a first aspect, an embodiment of the present application provides a battery, comprising:

[0008] Box;

[0009] a bottom guard plate, wherein the bottom guard plate and the box body define a receiving cavity;

[0010] A plurality of battery cells, wherein the plurality of battery cells are installed in the accommodating cavity;

[0011] A protective structure is installed on the end beam of the box body and is located between the end beam and the bottom guard plate. The minimum distance from the protective structure to the bottom guard plate is not greater than the minimum distance from the battery cell to the bottom guard plate.

[0012] In the above technical solution, through the setting of the above-mentioned protective structure and the position design of the end beam installed on the box body, bottom protection for multiple battery cells is achieved. Under the conditions of bottom scraping or bottom ball hitting, the protective structure can replace the battery cell close to the end beam to first withstand the impact of the bottom scraping, thereby reducing the impact energy received by the first battery cell, and then forming effective protection for the battery cell at the end in a targeted manner. Compared with being directly set at the bottom of the battery cell, the assembly difficulty of the protective structure is reduced, and the connection strength of the protective structure is improved.

[0013] In some embodiments, the end beam includes a first sub-beam and a second sub-beam connected to each other, the second sub-beam is located on the side of the first sub-beam close to the accommodating cavity, the protective structure is installed on the second sub-beam, and the minimum distance from the first sub-beam to the bottom guard plate is less than the minimum distance from the second sub-beam to the bottom guard plate.

[0014] In the above technical solution, the assembly of the protective structure and the second sub-beam is achieved by setting the relationship between the minimum distance between the first sub-beam and the second sub-beam and the bottom guard plate. The space reserved between the second sub-beam and the bottom guard plate is fully sufficient to accommodate the protective structure. The bottom guard plate does not need to be additionally shaped to compensate for the assembly tolerance, thereby simplifying the processing steps, reducing the processing difficulty, and thus improving the production efficiency of the battery, which is conducive to promotion and mass production.

[0015] In some embodiments, the minimum distance H1 from the protective structure to the bottom guard plate and the minimum distance H2 from the battery cell to the bottom guard plate satisfy: 1 ​​mm ≤ H2 - H1 ≤ 50 mm.

[0016] In some embodiments, the protective structure includes an assembly portion and a raised portion, the assembly portion is connected to the end beam, the raised portion protrudes from the assembly portion toward the bottom guard plate, and the minimum distance from the raised portion to the bottom guard plate is not greater than the minimum distance from the battery cell to the bottom guard plate.

[0017] In some embodiments, when the explosion-proof valve of the battery cell faces the bottom guard plate, the protrusion and the explosion-proof valve are arranged opposite to each other, and the length of the protrusion is greater than the length of the explosion-proof valve.

[0018] In some embodiments, the battery further comprises:

[0019] A pressure strip is connected to the box body and is located between the multiple battery cells and the bottom guard plate, and is used to cooperate with the protective structure to protect the electrode terminals of the battery cells. The length of the protrusion is less than the minimum distance between the farthest ends of the two electrode terminals of the battery cells.

[0020] In some embodiments, when the explosion-proof valve of the battery cell does not face the bottom guard plate and the electrode terminals of the battery cell face the bottom guard plate, the length of the protrusion is not less than the minimum distance between the farthest ends of the two electrode terminals of the battery cell.

[0021] In some embodiments, the protective structure includes a plurality of protective structures spaced apart and arranged along the length direction of the end beam, the plurality of battery cells are stacked in an array in the accommodating cavity, and the plurality of protective structures correspond one-to-one to the plurality of columns of battery cells.

[0022] In some embodiments, the maximum height H3 of the protective structure satisfies: 1mm≤H3≤50mm.

[0023] In some embodiments, the minimum width L of the protective structure satisfies: 10 mm ≤ L ≤ 50 mm.

[0024] In some embodiments, the box body includes a front end beam and a rear end beam. When the battery is installed in a vehicle, the front end beam and the rear end beam are arranged in a front-to-rear spacing along the driving direction of the vehicle, wherein:

[0025] The front end beam is provided with the protective structure;

[0026] or,

[0027] The front end beam and the rear end beam are both provided with the protective structure.

[0028] In a second aspect, an embodiment of the present application provides an electrical device, including:

[0029] A battery as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0031] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0032] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0033] FIG3 is a schematic diagram of a partial structure of a battery provided in some embodiments of the present application;

[0034] FIG4 is a cross-sectional view of a battery provided in some embodiments of the present application;

[0035] FIG5 is an enlarged view of the structure at point A in FIG4 ;

[0036] FIG6 is one of the structural schematic diagrams of the protection structure provided by some embodiments of the present application;

[0037] FIG7 is a second schematic diagram of the structure of the protection structure provided by some embodiments of the present application;

[0038] FIG8 is a third structural diagram of the protective structure provided in some embodiments of the present application.

[0039] Reference numerals: vehicle 1 , motor 20 , controller 30 ; battery 10 ; box body 11 , end beam 111 , first sub-beam 1111 , second sub-beam 1112 ; battery cell 12 , bottom guard plate 13 ; protective structure 14 , assembly portion 141 , protrusion 142 ; pressure strip 15 , buffer 16 . DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0042] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0044] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0045] The term "multiple" in this application 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).

[0046] The battery cells mentioned in the embodiments of this application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. The battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0047] 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 battery pack. A battery generally includes a casing that encloses one or more battery cells or multiple battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0048] A battery cell includes a casing, an electrode assembly, and an electrolyte. The casing is used to hold the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. 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. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet consists of a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector uncoated with the negative active material layer protrudes from the negative current collector coated with the negative active material layer. The negative current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. To ensure that high currents can pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together.

[0049] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0050] New energy vehicles have experienced rapid growth in recent years. Within the electric vehicle sector, power batteries, as the power source, play an irreplaceable and crucial role. A battery consists of a housing, an underbody, and multiple cells mounted within a cavity defined by the housing and underbody. As a core component of new energy vehicles, batteries have stringent requirements for both safety and cycle life.

[0051] The inventors discovered that batteries are extremely susceptible to damage under bottom scraping or bottom ball conditions. When the impact force of the bottom support is too large, it can directly lead to insulation abnormalities and other problems in the battery. More seriously, the battery may spontaneously combust or even cause safety accidents such as explosions. In related technologies, a bottom ball protection structure is added to the bottom of the battery cell. However, under this structure, the battery cell close to the end beam of the box body suffers the greatest damage due to the bottom support, and this protection method cannot effectively protect the battery cell at the end.

[0052] Based on the above considerations, in order to solve the problem of serious damage to the end battery cells under bottom scraping or bottom ball conditions, the inventors have designed a battery after in-depth research, including: a box body, a bottom guard plate, a protective structure and multiple battery cells, the bottom guard plate and the box body define a accommodating cavity; multiple battery cells are installed in the accommodating cavity; the protective structure is installed on the end beam of the box body, and is located between the end beam and the bottom guard plate, and the minimum distance from the protective structure to the bottom guard plate is not greater than the minimum distance from the battery cell to the bottom guard plate.

[0053] In a battery of this structure, by setting the protective structure on the end beam of the box body, this structure can, on the one hand, replace the battery cells at the end to bear the impact of scraping the bottom first, thereby reducing the impact energy received by the first battery cell, and thus effectively protecting the battery cells at the end. On the other hand, compared with directly setting it on the bottom of the battery cell, the assembly difficulty of the protective structure is reduced, and the connection strength of the protective structure is improved.

[0054] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0055] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device according to an embodiment of the present application.

[0056] As shown in Figure 1, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The 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 motor 20, a controller 30 and a battery 10 can be provided inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 20. For example, a battery 10 can be provided at the bottom, front or rear of the vehicle 1. The battery 10 can be used to power the vehicle 1. For example, the battery 10 can be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements of the vehicle 1 during startup, navigation and operation. In another embodiment of the present application, the battery 10 can not only serve 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.

[0057] In order to meet different power requirements, the battery 10 may include a plurality of battery cells 12 , wherein the plurality of battery cells 12 may be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series and parallel connection.

[0058] FIG2 is an exploded view of a battery 10 according to an embodiment of the present invention. The battery 10 includes a housing 11, a bottom guard plate 13, and a plurality of battery cells 12. The bottom guard plate 13 and the housing 11 define a receiving cavity, and the plurality of battery cells 12 are installed in the receiving cavity.

[0059] The accommodating cavity defined by the bottom guard plate 13 and the box body 11 can be in various shapes, such as a cylinder, a cuboid, etc.

[0060] In the battery 10, multiple battery cells 12 can be connected in series, in parallel, or in a hybrid connection. Hybrid connection means that multiple battery cells 12 are connected both in series and in parallel. Multiple battery cells 12 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 12 is installed in the accommodating cavity defined by the bottom guard plate 13 and the housing 11. Of course, the battery 10 can also be in the form of a battery module in which multiple battery cells 12 are first connected in series, in parallel, or in a hybrid connection, and then the multiple battery modules are connected in series, in parallel, or in a hybrid connection to form an entire battery cell, and then installed in the accommodating cavity defined by the bottom guard plate 13 and the housing 11. The battery 10 may also include other structures. For example, the battery 10 may also include a busbar component for achieving electrical connection between the multiple battery cells 12.

[0061] According to some embodiments of the present application, as shown in Figures 2-4, the present application provides a battery 10, comprising: a housing 11, a bottom guard plate 13, a protective structure 14, and a plurality of battery cells 12. The bottom guard plate 13 and the housing 11 define a receiving cavity; the plurality of battery cells 12 are mounted in the receiving cavity; the protective structure 14 is mounted on the end beam 111 of the housing 11, and is located between the end beam 111 and the bottom guard plate 13. The minimum distance between the protective structure 14 and the bottom guard plate 13 is no greater than the minimum distance between the battery cells 12 and the bottom guard plate 13.

[0062] In other words, the minimum distance between the protective structure 14 and the bottom guard plate 13 may be equal to the minimum distance between the battery cell 12 and the bottom guard plate 13 , or the minimum distance between the protective structure 14 and the bottom guard plate 13 may be smaller than the minimum distance between the battery cell 12 and the bottom guard plate 13 .

[0063] Among them, the protective structure 14 can be made of metal material or foam material. Specifically, the metal material can include but is not limited to stainless steel, aluminum alloy or titanium alloy, and the foam material can include but is not limited to MPP (Microcellular Polypropylene foam, microporous foamed polypropylene) type foam material, PP (polypropylene, polypropylene) type foam material or PE (Polyethylene, polyethylene) type foam material, etc., which are not limited here.

[0064] When the protective structure 14 is made of metal material, the connection method between the protective structure 14 and the end beam 111 of the box body 11 may include but is not limited to welding, gluing, bolt connection, FDS (Flow Drill Screw, hot melt self-tapping) connection or riveting connection, etc., which is not limited here.

[0065] In the case where the protective structure 14 is made of foam material, the connection method between the protective structure 14 and the end beam 111 of the box body 11 may include but is not limited to gluing or bolting, etc., which is not limited here.

[0066] In actual implementation, as shown in Figures 2 to 4, after the battery 10 is assembled into the electrical device, when the electrical device is in high-speed movement, the bottom of the electrical device is likely to collide with some protrusions in the travel path. In this bottom scraping condition or bottom ball hitting condition, the protrusion first collides with the protective structure 14 located at the end beam 111 of the box body 11, and the protective structure 14 undergoes a certain deformation to absorb most of the impact energy. Then the protrusion contacts the battery cell 12 close to the end beam 111. Since the protective structure 14 has played a force unloading and buffering role for the impact of the protrusion, the impact force of the protrusion on the battery cell 12 close to the end beam 111 is almost gone, effectively alleviating the threat of the bottom support to the battery cell 12 close to the end beam 111.

[0067] The battery 10 provided in the embodiment of the present application realizes bottom protection for multiple battery cells 12 through the arrangement of the above-mentioned protective structure 14 and the position design of the end beam 111 installed on the box body 11. Under the conditions of bottom scraping or bottom ball hitting, the protective structure 14 can replace the battery cell 12 close to the end beam 111 to first withstand the impact of the bottom scraping, thereby reducing the impact energy received by the first battery cell 12, and then forming effective protection for the battery cell 12 at the end in a targeted manner. Compared with being directly arranged at the bottom of the battery cell 12, the assembly difficulty of the protective structure 14 is reduced, and the connection strength of the protective structure 14 is improved.

[0068] According to some embodiments of the present application, as shown in Figures 3-5, the end beam 111 may include a first sub-beam 1111 and a second sub-beam 1112 connected to each other, the second sub-beam 1112 may be located on the side of the first sub-beam 1111 close to the accommodating cavity, the protective structure 14 may be installed on the second sub-beam 1112, and the minimum distance from the first sub-beam 1111 to the bottom guard plate 13 may be smaller than the minimum distance from the second sub-beam 1112 to the bottom guard plate 13.

[0069] In this embodiment, as shown in Figures 3 to 5, when the minimum distance between the first sub-beam 1111 and the bottom guard plate 13 is smaller than the minimum distance between the second sub-beam 1112 and the bottom guard plate 13, the space between the second sub-beam 1112 and the bottom guard plate 13 is larger than the space between the first sub-beam 1111 and the bottom guard plate 13, and the space reserved between the second sub-beam 1112 and the bottom guard plate 13 is sufficient to accommodate the protective structure 14. Under this structure, the bottom guard plate 13 does not need to be specially designed to compensate for the thickness difference of the protective structure 14.

[0070] It should be noted that when the protective structure 14 is made of metal material, there is no contact between the protective structure 14 and the bottom guard plate 13; when the protective structure 14 is made of foam material, based on the high elasticity of the foam material itself, the protective structure 14 is installed in a compressed state between the end beam 111 and the bottom guard plate 13.

[0071] The battery 10 provided in the embodiment of the present application realizes the assembly of the protective structure 14 and the second sub-beam 1112 by setting the relationship between the minimum distance between the first sub-beam 1111 and the second sub-beam 1112 and the bottom guard plate 13. The space reserved between the second sub-beam 1112 and the bottom guard plate 13 is completely sufficient to accommodate the protective structure 14. The bottom guard plate 13 does not need to be additionally shaped to compensate for the assembly tolerance, thereby simplifying the processing steps, reducing the processing difficulty, and thus improving the production efficiency of the battery 10, which is conducive to promotion and mass production.

[0072] According to some embodiments of the present application, as shown in FIG5 , the minimum distance H1 between the protective structure 14 and the bottom guard plate 13 and the minimum distance H2 between the battery cell 12 and the bottom guard plate 13 may satisfy: 1 ​​mm ≤ H2 − H1 ≤ 50 mm.

[0073] Specifically, H2-H1 can be 1 mm, 12.5 mm, 25 mm, 42.55 mm, 50 mm, or other values ​​between 1 mm and 50 mm, which is not limited here.

[0074] The battery 10 provided in the embodiment of the present application, through the aforementioned range limitation of H2-H1, prevents H2-H1 from being too large, which would result in the height of the protective structure 14 being too large, thereby minimizing the volume of the battery 10 and thereby improving the capacity density of the battery 10; and prevents H2-H1 from being too small, which would result in the replacement sacrificial capacity of the protective structure 14 being too weak, thereby optimizing the protective effect of the protective structure 14.

[0075] According to some embodiments of the present application, as shown in Figures 6 to 8, the protective structure 14 may include an assembly portion 141 and a protrusion 142. The assembly portion 141 may be connected to the end beam 111, and the protrusion 142 protrudes from the assembly portion 141 toward the bottom guard plate 13. The minimum distance between the protrusion 142 and the bottom guard plate 13 may not be greater than the minimum distance between the battery cell 12 and the bottom guard plate 13.

[0076] In this embodiment, as shown in Figures 6 to 8, the connection between the assembly portion 141 and the raised portion 142 can be integrated, the assembly portion 141 can be located at both ends of the raised portion 142, the thickness of the assembly portion 141 can be much smaller than the thickness of the raised portion 142, and the raised portion 142 can protect the battery cell 12 close to the end beam 111 under the bottom supporting working condition. The assembly portion 141 can be connected to the end beam 111 of the box body 11. Specifically, the assembly portion 141 is connected to the end beam 111 of the box body 11 by bolts or FDS (Flow Drill When the assembly part 141 is connected to the end beam 111 of the box body 11 by connecting parts such as screw, hot-melt self-tapping screw or rivet, the assembly part 141 can be provided with a connecting hole that cooperates with the connecting part, and the end beam 111 of the box body 11 can also be provided with a corresponding connecting hole; when the assembly part 141 is connected to the end beam 111 of the box body 11 by welding, a plurality of welding points can be set between the assembly part 141 and the end beam 111 of the box body 11, and the welding method can be plug welding, spot welding or projection welding; when the assembly part 141 is connected to the end beam 111 of the box body 11 by gluing, the assembly part 141 and the end beam 111 of the box body 11 can be bonded with a high-strength structural adhesive, wherein the structural adhesive can include but is not limited to high-performance silicone structural adhesive or neutral transparent silicone structural adhesive.

[0077] The battery 10 provided in the embodiment of the present application, through the arrangement of the above-mentioned assembly portion 141 and the raised portion 142, the raised portion 142 can effectively support the bottom of the battery cell 12. At the same time, the assembly portion 141 is connected to the end beam 111 of the box body 11 to realize the fixed assembly of the protective structure 14. The overall structure is simple, the functional divisions are clear, and a miniaturized and lightweight design is achieved.

[0078] According to some embodiments of the present application, as shown in Figures 2-3, when the explosion-proof valve of the battery cell 12 faces the bottom guard plate 13, the protrusion 142 and the explosion-proof valve can be arranged relative to each other, and the length of the protrusion 142 can be greater than the length of the explosion-proof valve.

[0079] In this embodiment, as shown in Figures 2 and 3, the opening of the box body 11 can face downward, the explosion-proof valve and electrode terminals of the battery cell 12 can face the bottom guard plate 13, the center of the protrusion 142 and the center of the explosion-proof valve can be arranged opposite each other in the front-to-back direction, and the length of the protrusion 142 can be greater than the length of the explosion-proof valve. When the battery 10 is in the bottom scraping or bottom ball working condition, the protrusions in the travel path can hit the battery cell 12 in the front-to-back direction. When the shielding length of the protrusion 142 is sufficient, it is difficult for the protrusion to bypass the protrusion 142 and directly hit the explosion-proof valve of the battery cell 12.

[0080] The battery 10 provided in the embodiment of the present application, through the above-mentioned length design of the raised portion 142 of the protective structure 14 when the explosion-proof valve of the battery cell 12 is facing the bottom guard plate 13, realizes that the raised portion 142 of the protective structure 14 mainly provides bottom protection for the explosion-proof valve of the battery cell 12 of the bottom spraying structure during bottom scraping or bottom ball working conditions, preventing the raised portion 142 from being insufficient in length to cover the explosion-proof valve of the bottom spraying, causing the explosion-proof valve to be impacted by the scraping bottom, thereby optimizing the safety protection performance of the entire battery 10.

[0081] According to some embodiments of the present application, as shown in FIG. 2-FIG . 3 , the battery 10 may further include: a pressing bar 15 .

[0082] The pressure strip 15 can be connected to the box body 11, and the pressure strip 15 can be located between multiple battery cells 12 and the bottom guard plate 13. The pressure strip 15 can be used to cooperate with the protective structure 14 to protect the electrode terminals of the battery cells 12. The length of the protrusion 142 can be less than the minimum distance between the farthest ends of the two electrode terminals of the battery cell 12.

[0083] The bead 15 may include a bead body and a joint. The bead body may form a mounting groove; both ends of the bead body may be connected to a joint, and the joint may include a main section connected to the bead body and an assembly section connected to the box body 11. At least a portion of the main section may be installed in the mounting groove.

[0084] In actual implementation, as shown in Figures 2 and 3, the width of the main section can be smaller than the width of the assembly section, the entire joint can be approximately T-shaped, and the thickness of the main section can be smaller than the thickness of the assembly section. The assembly section can be separated from the protective structure 14. When the battery 10 is in the bottom scraping or bottom ball working condition, based on the fact that the length of the protrusion 142 can be greater than the length of the explosion-proof valve, and the length of the protrusion 142 can be less than the minimum distance between the farthest ends of the two electrode terminals of the battery cell 12, the protrusion 142 can be combined with the assembly section of the pressure strip 15 to jointly block the two electrode terminals in the front and rear directions. It is difficult for the protrusion to bypass the protrusion 142 and the assembly section of the pressure strip 15 to directly hit the two electrode terminals of the battery cell 12.

[0085] The battery 10 provided in the embodiment of the present application solves the problem that the protective structure 14 alone is insufficient to protect the two electrode terminals through the design of the above-mentioned pressure strip 15 and the length design of the raised portion 142 of the protective structure 14. The bottom protection of the electrode terminals of the battery cell 12 of the bottom spraying structure by the raised portion 142 combined with the pressure strip 15 is achieved during bottom scraping or bottom ball working conditions, thereby further optimizing the safety protection performance of the entire battery 10.

[0086] According to some embodiments of the present application, when the explosion-proof valve of the battery cell 12 is not facing the bottom guard plate 13 and the electrode terminals of the battery cell 12 are facing the bottom guard plate 13, the length of the protrusion 142 may be no less than the minimum distance between the farthest ends of the two electrode terminals of the battery cell 12.

[0087] In this embodiment, the explosion-proof valve is not facing the bottom, the electrode terminals are facing the bottom, the length of the protrusion 142 can be equal to the minimum distance between the farthest ends of the two electrode terminals of the battery cell 12, or the length of the protrusion 142 can be greater than the minimum distance between the farthest ends of the two electrode terminals of the battery cell 12. When the battery 10 is in the bottom scraping or bottom ball working condition, the protrusions in the travel path can hit the battery cell 12 in the front and rear directions. When the shielding length of the protrusion 142 is sufficient, it is difficult for the protrusion to bypass the protrusion 142 and directly hit the two electrode terminals of the battery cell 12.

[0088] The battery 10 provided in the embodiment of the present application, through the above-mentioned length design of the raised portion 142 of the protective structure 14 when the explosion-proof valve is not facing the bottom guard plate 13 and the electrode terminals are facing the bottom guard plate 13, realizes that the raised portion 142 of the protective structure 14 mainly provides bottom protection for the two electrode terminals of the battery cell 12 during bottom scraping or bottom ball working conditions, preventing the raised portion 142 from being insufficient in length to cover the two electrode terminals at the bottom, causing the electrode terminals to be impacted by bottom scraping, thereby optimizing the safety protection performance of the entire battery 10.

[0089] According to some embodiments of the present application, as shown in Figures 2-3, the protective structure 14 may include multiple protective structures 14 arranged at intervals along the length direction of the end beam 111, and multiple battery cells 12 may be stacked in an array in the accommodating cavity, and the multiple protective structures 14 may correspond one to one to multiple columns of battery cells 12.

[0090] Here, "multiple" means 2 or more. For example, in some embodiments, as shown in Figures 2 and 3, the protective structure 14 may include 4 protective structures 14 arranged at intervals along the length direction of the end beam 111, and the 4 protective structures 14 may correspond one-to-one to the 4 columns of battery cells 12.

[0091] In this embodiment, as shown in Figures 2 and 3, the arrangement direction of the two end beams 111 is the front-to-back direction, and the length direction of the end beam 111 is the left-to-right direction. Multiple battery cells 12 can be divided into multiple columns along the left-to-right direction, and multiple battery cells 12 can be divided into multiple rows along the front-to-back direction. When the battery 10 is in the bottom-scraping or bottom-ball working condition, the bottom-scraping protection knot can specifically protect the corresponding column of battery cells 12.

[0092] The battery 10 provided in the embodiment of the present application, through the arrangement of the above-mentioned multiple protective structures 14, combined with the structural design of the relative arrangement of the multiple protective structures 14 and the multiple columns of battery cells 12, achieves targeted protection of each column of battery cells 12 under bottom scraping or bottom ball conditions, comprehensively reduces the impact energy received by the first battery cell 12 in each column, thereby comprehensively optimizing the bottom scraping protection effect of the battery 10, and further improving the consistency of the entire battery 10.

[0093] According to some embodiments of the present application, as shown in FIG7 , the maximum height H3 of the protective structure 14 may satisfy: 1 ​​mm ≤ H3 ≤ 50 mm.

[0094] Specifically, the maximum height H3 of the protective structure 14 can be 1 mm, 5.25 mm, 10 mm, 25 mm, 45.5 mm, 50 mm, or other values ​​between 1 mm and 50 mm, which is not limited here.

[0095] Preferably, the maximum height H3 of the protective structure 14 may satisfy: 5 mm ≤ H3 ≤ 30 mm.

[0096] The battery 10 provided in the embodiment of the present application, by limiting the maximum height H3 of the protective structure 14, prevents the maximum height H3 of the protective structure 14 from being too large, which would result in an excessively large volume of the protective structure 14. This minimizes the volume of the battery 10 and thereby increases the energy density of the battery 10. Furthermore, the maximum height H3 of the protective structure 14 is prevented from being too small, which would result in insufficient cushioning provided by the protective structure 14. This maximizes the sacrificial protection capability of the protective structure 14 and thereby reduces the impact energy received by the first battery cell 12.

[0097] According to some embodiments of the present application, as shown in FIG8 , the minimum width L of the protective structure 14 may satisfy: 10 mm ≤ L ≤ 50 mm.

[0098] Specifically, the minimum width L of the protective structure 14 may be 10 mm, 15.5 mm, 22.225 mm, 25 mm, 37.5 mm, 50 mm, or other values ​​between 10 mm and 50 mm, which is not limited here.

[0099] Preferably, the minimum width L of the protective structure 14 may satisfy: 10 mm ≤ L ≤ 30 mm.

[0100] It should be noted that in actual design, the width of the protective structure 14 can be uniform along the length direction.

[0101] The battery 10 provided in the embodiment of the present application, through the aforementioned limitation on the minimum width L of the protective structure 14 , prevents the minimum width L of the protective structure 14 from being too large, which would result in an excessively large volume of the protective structure 14 , thereby minimizing the volume of the battery 10 and thereby improving the energy density of the battery 10 . Furthermore, the battery 10 is prevented from being too small, which would result in insufficient cushioning provided by the protective structure 14 , thereby maximizing the sacrificial protection capability of the protective structure 14 and thereby reducing the impact energy received by the first battery cell 12 .

[0102] According to some embodiments of the present application, as shown in Figures 1-5, the box body 11 may include a front end beam and a rear end beam. When the battery 10 is installed on the vehicle, the front end beam and the rear end beam are arranged at intervals in the front and rear direction of travel of the vehicle, wherein the front end beam may be provided with a protective structure 14.

[0103] In this embodiment, as shown in Figures 1-5, taking the electrical device as a vehicle 1 as an example, during the driving of the vehicle 1, when the road conditions are bad, the chassis of the vehicle 1 is easily scratched by protrusions in the travel route. Based on the forward driving direction of the vehicle 1, when the vehicle 1 scrapes the bottom or hits the bottom, the protrusion usually hits the battery 10 from the front to the rear. In the case where the front beam can be provided with a protective structure 14, the protrusion first collides with the protective structure 14 located on the front beam, and the protective structure 14 undergoes a certain deformation to absorb most of the impact energy. Then the protrusion contacts the battery cell 12 close to the end beam 111. Since the protective structure 14 has played a force unloading and buffering role for the impact of the protrusion, the impact force of the protrusion on the battery cell 12 close to the front beam is almost gone, effectively alleviating the threat of the bottoming to the battery cell 12 close to the front beam.

[0104] The battery 10 provided in the embodiment of the present application has a structural design in which the front end beam is provided with a protective structure 14. Under the conditions of bottom scraping or bottom ball hitting, the protective structure 14 can replace the battery cell 12 close to the front end beam to first withstand the impact of the bottom scraping, thereby reducing the impact energy received by the first battery cell 12 close to the front end beam when a bottoming accident occurs during the forward driving of the electric device.

[0105] According to some embodiments of the present application, the box body 11 may include a front end beam and a rear end beam, wherein both the front end beam and the rear end beam may be provided with a protective structure 14 .

[0106] In this embodiment, as shown in Figures 1-5, taking the electric device as a vehicle 1 as an example, the normal driving direction of the vehicle 1 is forward. However, in certain special circumstances, the vehicle 1 needs to reverse. When the vehicle 1 is reversing, the driver's line of sight is partially blocked, and the chassis of the vehicle 1 is easily scratched by protrusions in the reverse path. Since the speed of the vehicle 1 in the reverse condition is much lower than the speed of the vehicle 1 in the normal driving condition, the impact force of the protrusion in the event of a bottoming accident when the vehicle 1 is reversing is much smaller. However, it still poses a certain threat to the first battery cell near the rear end beam. If both the front end beam and the rear end beam are provided with protective structures 14, when a bottoming accident or a bottoming ball accident occurs during the forward movement of the vehicle 1, the protective structure 14 located on the front end beam can first collide with the protrusion to protect the first battery cell 12 near the front end beam; when a bottoming accident or a bottoming ball accident occurs during the reverse movement of the vehicle 1, the protective structure 14 located on the rear end beam can first collide with the protrusion to protect the first battery cell 12 near the rear end beam.

[0107] The battery 10 provided in the embodiment of the present application has a structural design in which both the front end beam and the rear end beam are provided with a protective structure 14. The protective structure 14 can replace the battery cells 12 close to the front end beam and the rear end beam to first withstand the impact of bottom scraping, thereby reducing the impact energy received by the first battery cell 12 close to the front end beam when a bottoming accident occurs during the forward travel of the electric device, and reducing the impact energy received by the first battery cell 12 close to the rear end beam when a bottoming accident occurs during the backward travel of the electric device, thereby greatly increasing the usable width of the battery 10.

[0108] According to some embodiments of the present application, as shown in Figures 2-3, the battery 10 may further include a buffer 16, which may be arranged on the bottom surface of multiple battery cells 12, and the buffer 16 may be arranged separated from the pressure strip 15. The buffer 16 and the pressure strip 15 may both be located between the multiple battery cells 12 and the bottom guard plate 13.

[0109] The buffer member 16 may be used to protect the electrode terminals of the plurality of battery cells 12 when the electrode terminals face the bottom guard plate 13 .

[0110] The buffer member 16 may include but is not limited to a foam board, pearl cotton or polyurethane foam plastic, etc., which is not limited here.

[0111] By providing buffer members 16 on the bottom surfaces of the plurality of battery cells 12 and cooperating with the provision of the protective structure 14 , double protection of the plurality of battery cells 12 is achieved under bottom scraping or bottom ball conditions, further reducing the impact energy received by the first battery cell 12 .

[0112] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 10 of any of the above solutions, and the battery 10 is used to provide electrical energy to the electrical device.

[0113] The power-consuming device may be any of the aforementioned devices or systems using the battery 10 .

[0114] According to some embodiments of the present application, as shown in Figures 2 to 8 , the present application provides a battery 10 comprising: a housing 11, a bottom guard plate 13, a protective structure 14, and a plurality of battery cells 12. The bottom guard plate 13 and the housing 11 define a receiving cavity; the plurality of battery cells 12 are mounted in the receiving cavity; the protective structure 14 is mounted on the end beam 111 of the housing 11, and is located between the end beam 111 and the bottom guard plate 13. The minimum distance between the protective structure 14 and the bottom guard plate 13 is no greater than the minimum distance between the battery cells 12 and the bottom guard plate 13. The end beam 111 includes a first sub-beam 1111 and a second sub-beam 1112 connected to each other. The second sub-beam 1112 is located on the side of the first sub-beam 1111 near the receiving cavity. The protective structure 14 is mounted on the second sub-beam 1112, and the minimum distance between the first sub-beam 1111 and the bottom guard plate 13 is less than the minimum distance between the second sub-beam 1112 and the bottom guard plate 13. The protective structure 14 includes a mounting portion 141 and a raised portion 142. The mounting portion 141 is connected to the end beam 111, and the minimum distance between the raised portion 142 and the bottom guard plate 13 is no greater than the minimum distance between the battery cells 12 and the bottom guard plate 13. The protective structure 14 comprises multiple structures spaced apart along the length of the end beam 111. Multiple battery cells 12 are stacked in an array within the housing cavity, with each protective structure 14 corresponding to each column of battery cells 12. The housing 11 includes a front beam and a rear beam, with the front beam being provided with the protective structure 14.

[0115] The explosion-proof valve of the battery cell 12 faces the bottom guard plate 13, the raised portion 142 and the explosion-proof valve are arranged opposite to each other, and the length of the raised portion 142 is greater than the length of the explosion-proof valve. The battery 10 also includes: a pressure strip 15, the pressure strip 15 is connected to the box body 11, and the pressure strip 15 is located between multiple battery cells 12 and the bottom guard plate 13, the pressure strip 15 is used to cooperate with the protective structure 14 to protect the electrode terminals of the battery cell 12, and the length of the raised portion 142 is less than the minimum distance between the farthest ends of the two electrode terminals of the battery cell 12.

[0116] Among them, the minimum distance H1 between the protective structure 14 and the bottom guard plate 13 and the minimum distance H2 between the battery cell 12 and the bottom guard plate 13 meet the following requirements: 0mm≤H2-H1≤50mm; the maximum height H3 of the protective structure 14 meets the following requirements: 1mm≤H3≤50mm; and the minimum width L of the protective structure 14 meets the following requirements: 10mm≤L≤50mm.

[0117] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0118] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery, characterized in that: include: Box; a bottom guard plate, wherein the bottom guard plate and the box body define a receiving cavity; A plurality of battery cells, wherein the plurality of battery cells are installed in the accommodating cavity; A protective structure is installed on the end beam of the box body and is located between the end beam and the bottom guard plate. The minimum distance from the protective structure to the bottom guard plate is not greater than the minimum distance from the battery cell to the bottom guard plate.

2. The battery according to claim 1, characterized in that The end beam includes a first sub-beam and a second sub-beam connected to each other, the second sub-beam is located on the side of the first sub-beam close to the accommodating cavity, the protective structure is installed on the second sub-beam, and the minimum distance from the first sub-beam to the bottom guard plate is smaller than the minimum distance from the second sub-beam to the bottom guard plate.

3. The battery according to claim 1 or 2, characterized in that The minimum distance H1 from the protective structure to the bottom guard plate and the minimum distance H2 from the battery cell to the bottom guard plate satisfy: 1mm≤H2-H1≤50mm.

4. The battery according to any one of claims 1 to 3, characterized in that The protective structure includes an assembly portion and a raised portion, the assembly portion is connected to the end beam, the raised portion protrudes from the assembly portion toward the bottom guard plate, and the minimum distance from the raised portion to the bottom guard plate is not greater than the minimum distance from the battery cell to the bottom guard plate.

5. The battery according to claim 4, characterized in that When the explosion-proof valve of the battery cell faces the bottom guard plate, the protrusion and the explosion-proof valve are arranged opposite to each other, and the length of the protrusion is greater than the length of the explosion-proof valve.

6. The battery according to claim 5, characterized in that Also includes: A pressure strip is connected to the box body and is located between the multiple battery cells and the bottom guard plate, and is used to cooperate with the protective structure to protect the electrode terminals of the battery cells. The length of the protrusion is less than the distance between the farthest ends of the two electrode terminals of the battery cells.

7. The battery according to claim 4, characterized in that When the explosion-proof valve of the battery cell does not face the bottom guard plate and the electrode terminals of the battery cell face the bottom guard plate, the length of the protrusion is not less than the distance between the farthest ends of the two electrode terminals of the battery cell.

8. The battery according to any one of claims 1 to 7, characterized in that The protective structures include a plurality of protective structures spaced apart and arranged along the length direction of the end beam, the plurality of battery cells are stacked in an array in the accommodating cavity, and the plurality of protective structures correspond one-to-one to the plurality of columns of battery cells.

9. The battery according to any one of claims 1 to 8, characterized in that The maximum height H3 of the protective structure satisfies: 1mm≤H3≤50mm.

10. The battery according to any one of claims 1 to 9, characterized in that The minimum width L of the protective structure satisfies: 10mm≤L≤50mm.

11. The battery according to any one of claims 1 to 10, characterized in that The box body includes a front end beam and a rear end beam. When the battery is installed in a vehicle, the front end beam and the rear end beam are arranged at intervals in the front and rear directions along the driving direction of the vehicle. The front end beam is provided with the protective structure; or, The front end beam and the rear end beam are both provided with the protective structure.

12. An electrical device, characterized in that: include: The battery according to any one of claims 1 to 11.

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