Battery and electric device

Abstract

The embodiment of the utility model provides a battery and an electric device, and belongs to the technical field of batteries. The battery comprises a box body; a containing cavity is defined by the bottom protection plate and the box body; a plurality of single batteries, wherein the plurality of single batteries are arranged in the accommodating cavity; the protection structure is installed on an end beam of the box body and located between the end beam and the bottom protection plate, and the minimum distance between the protection structure and the bottom protection plate is not larger than the minimum distance between the single batteries and the bottom protection plate. Through the arrangement of the protection structure and the position design of the end beam mounted on the box body in a matched manner, the protection structure can replace the battery monomer close to the end beam to firstly bear the bottom scraping impact under the bottom scraping or bottom ball hitting working condition, so that the impact energy received by the first battery monomer is reduced; therefore, the battery monomers at the end parts are effectively protected in a targeted manner, and meanwhile, the assembly difficulty of the protection structure is reduced.

Description

Technical Field

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

[0002] 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. However, the damage caused by the bottom support is at the bottom of the battery, which is not easy to detect and is hidden. Although some bottom support accidents did not cause fire at the time 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 in a squeezed state. After a period of time, the battery may spontaneously combust or even cause serious safety accidents such as explosions. Utility Model Content

[0003] The present application provides a battery and an electrical device to reduce the impact energy received by the first battery cell, to provide effective protection for the battery cells at the end, and to reduce the difficulty of assembling the protection structure.

[0004] In a first aspect, an embodiment of the present application provides a battery, comprising:

[0005] Box;

[0006] A bottom guard plate, wherein the bottom guard plate and the box body define a receiving cavity;

[0007] A plurality of battery cells, wherein the plurality of battery cells are installed in the accommodation cavity;

[0008] 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.

[0009] In the above technical scheme, 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 condition 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 protective structure reduces the difficulty of assembling the protective structure and improves the connection strength of the protective structure.

[0010] In some embodiments, the end beam includes a first sub-beam and a second sub-beam connected, the second sub-beam is located on a 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.

[0011] 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 sufficient to accommodate the protective structure. The bottom guard plate does not need to be additionally designed with a special shape to compensate for the assembly tolerance, thereby simplifying the processing steps, reducing the processing difficulty, and further improving the production efficiency of the battery, which is conducive to promotion and mass production.

[0012] In some embodiments, a minimum distance H1 from the protective structure to the bottom guard plate and a minimum distance H2 from the battery cell to the bottom guard plate satisfy: 1 ​​mm ≤ H2 - H1 ≤ 50 mm.

[0013] 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.

[0014] 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.

[0015] In some embodiments, the battery further comprises:

[0016] 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 cell.

[0017] In some embodiments, when the explosion-proof valve of the battery cell is not facing the bottom guard plate and the electrode terminals of the battery cell are facing 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.

[0018] In some embodiments, the protective structure includes a plurality of protective structures arranged at intervals 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.

[0019] In some embodiments, the maximum height H3 of the protective structure satisfies: 1mm≤H3≤50mm.

[0020] In some embodiments, the minimum width L of the protective structure satisfies: 10 mm ≤ L ≤ 50 mm.

[0021] 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:

[0022] The front end beam is provided with the protective structure;

[0023] or,

[0024] The front end beam and the rear end beam are both provided with the protective structure.

[0025] In a second aspect, an embodiment of the present application provides an electrical device, including:

[0026] A battery as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0029] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0030] Figure 3 A schematic diagram of a partial structure of a battery provided in some embodiments of the present application;

[0031] Figure 4 A cross-sectional view of a battery provided for some embodiments of the present application;

[0032] Figure 5 for Figure 4 A magnified view of the structure at center A;

[0033] Figure 6 One of the structural schematic diagrams of the protection structure provided in some embodiments of the present application;

[0034] Figure 7 A second structural schematic diagram of a protective structure provided in some embodiments of the present application;

[0035] Figure 8 The third structural schematic diagram of the protection structure provided for some embodiments of the present application.

[0036] Reference numerals:

[0037] Vehicle 1, motor 20, controller 30;

[0038] Battery 10;

[0039] Box body 11, end beam 111, first sub-beam 1111, second sub-beam 1112;

[0040] Battery cell 12, bottom guard plate 13;

[0041] Protective structure 14, assembly portion 141, protrusion 142;

[0042] Pressure strip 15 and buffer member 16. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application 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 drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0045] Reference to "embodiments" in this application 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 in this application may be combined with other embodiments.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can 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 application generally indicates that the associated objects before and after are in an "or" relationship.

[0048] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0049] The battery cells mentioned in the embodiments of the present 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., which are not limited in the embodiments of the present application. The battery cells may be cylindrical, flat, rectangular or other shapes, etc., which are not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which are not limited in the embodiments of the present application.

[0050] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0051] The battery cell includes a shell, an electrode assembly and an electrolyte, and the shell is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed 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 a positive electrode ear. 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 includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0052] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0053] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box, a bottom guard plate, and multiple battery cells installed in the accommodating cavity defined by the box and the bottom guard plate. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of safety and cycle life.

[0054] The inventors have discovered that batteries are extremely susceptible to damage under bottom scraping conditions or bottom ball conditions. When the impact force of the bottom support is too large, it can directly lead to insulation abnormalities in the battery and other problems. 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 cells close to the end beams of the box body suffer the greatest damage due to the bottom support, and this protection method cannot effectively protect the battery cells at the ends.

[0055] Based on the above considerations, in order to solve the problem that the end battery cells are seriously damaged 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 a plurality of battery cells, the bottom guard plate and the box body define a accommodating cavity; a plurality of 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.

[0056] In a battery of this structure, by setting the protective structure on the end beam of the box body, on the one hand, the protective structure can replace the battery cell at the end to bear the impact of scraping the bottom first, thereby reducing the impact energy received by the first battery cell, and then effectively protecting the battery cell at the end; on the other hand, compared with directly setting it on the bottom of the battery cell, the difficulty of assembling the protective structure is reduced, and the connection strength of the protective structure is improved.

[0057] The battery disclosed in the embodiment of the present application can be used in, but is not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery thermal management system disclosed in the present application and batteries etc. can be used to form the electrical device, which is conducive to improving the scope of application of the battery thermal management system and reducing the difficulty of assembling the battery thermal management system.

[0058] 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.

[0059] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device in an embodiment of the present application.

[0060] like Figure 1As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 20, a controller 30 and a battery 10 may be arranged 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 may be arranged at the bottom, front or rear of the vehicle 1. The battery 10 may be used to power the vehicle 1. For example, the battery 10 may 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 during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used 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.

[0061] In order to meet different power usage 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 connection and parallel connection.

[0062] like Figure 2 The figure is an exploded view of the structure of a battery 10 according to an embodiment of the present application. The battery 10 comprises a box body 11, a bottom guard plate 13 and a plurality of battery cells 12. The bottom guard plate 13 and the box body 11 define a receiving cavity, and the plurality of battery cells 12 are installed in the receiving cavity.

[0063] 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.

[0064] In the battery 10, multiple battery cells 12 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple battery cells 12 are connected in series and in parallel. Multiple battery cells 12 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by multiple battery cells 12 is installed in the accommodating cavity defined by the bottom guard plate 13 and the box body 11; of course, the battery 10 can also be a battery module formed by connecting multiple battery cells 12 in series, in parallel, or in a mixed connection, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and installed in the accommodating cavity defined by the bottom guard plate 13 and the box body 11. The battery 10 may also include other structures. For example, the battery 10 may also include a converging component for realizing electrical connection between multiple battery cells 12.

[0065] According to some embodiments of the present application, Figure 2-Figure 4As shown, the present application provides a battery 10, comprising: a box body 11, a bottom guard plate 13, a protective structure 14 and a plurality of battery cells 12. The bottom guard plate 13 and the box body 11 define a receiving cavity; the plurality of battery cells 12 are installed in the receiving cavity; the protective structure 14 is installed on the end beam 111 of the box body 11, and the protective structure 14 is located between the end beam 111 and the bottom guard plate 13, and the minimum distance between the protective structure 14 and the bottom guard plate 13 is not greater than the minimum distance between the battery cell 12 and the bottom guard plate 13.

[0066] 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 .

[0067] 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, etc., 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 is not limited here.

[0068] 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.

[0069] 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.

[0070] In actual implementation, Figure 2-Figure 4 As shown, after the battery 10 is assembled into the electrical device, when the electrical device is in the process of 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 left, which effectively alleviates the threat of the bottom support to the battery cell 12 close to the end beam 111.

[0071] The battery 10 provided in the embodiment of the present application realizes bottom protection for multiple battery cells 12 through the setting of the above-mentioned protective structure 14 and the position design of the end beam 111 installed on the box body 11. Under the condition 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. In addition, compared with being directly set 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.

[0072] According to some embodiments of the present application, Figure 3-Figure 5 As shown, 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 a 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.

[0073] In this embodiment, if Figure 3-Figure 5 As shown, 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 additionally designed with a special shape to compensate for the thickness difference of the protective structure 14.

[0074] 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.

[0075] 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 further improving the production efficiency of the battery 10, which is conducive to promotion and mass production.

[0076] According to some embodiments of the present application, Figure 5As shown, 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 can satisfy: 1mm≤H2-H1≤50mm.

[0077] 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.

[0078] The battery 10 provided in the embodiment of the present application prevents H2-H1 from being too large, which causes the height of the protective structure 14 to be too large, through the above-mentioned range limitation of H2-H1, thereby reducing the volume of the battery 10 as much as possible, thereby improving the energy density of the battery 10; and prevents H2-H1 from being too small, which causes the replacement sacrificial ability of the protective structure 14 to be too weak, thereby optimizing the protective effect of the protective structure 14.

[0079] According to some embodiments of the present application, Figure 6-Figure 8 As shown, 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.

[0080] In this embodiment, if Figure 6-Figure 8 As shown, the connection between the assembly part 141 and the raised part 142 can be integrated, the assembly part 141 can be located at both ends of the raised part 142, the thickness of the assembly part 141 can be much smaller than the thickness of the raised part 142, the raised part 142 can protect the battery cell 12 close to the end beam 111 under the bottom supporting condition, and the assembly part 141 can be connected to the end beam 111 of the box body 11. Specifically, the assembly part 141 is fixed 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.

[0081] 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 play an effective bottom supporting and protecting role for the battery cell 12, and 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 protection structure 14. The overall structure is simple, the functional division is clear, and a miniaturized and lightweight design is achieved.

[0082] According to some embodiments of the present application, Figure 2-Figure 3 As shown, 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 opposite to each other, and the length of the protrusion 142 can be greater than the length of the explosion-proof valve.

[0083] In this embodiment, if Figure 2-Figure 3 As shown, 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, the length of the protrusion 142 can be greater than the length of the explosion-proof valve, and 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.

[0084] The battery 10 provided in the embodiment of the present application, through the 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 bottom scraping, thereby optimizing the safety protection performance of the entire battery 10.

[0085] According to some embodiments of the present application, Figure 2-Figure 3 As shown, the battery 10 may further include a pressure bar 15 .

[0086] 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.

[0087] The pressure strip 15 may include a pressure strip body and a joint. The pressure strip body may form an installation groove; both ends of the pressure strip body may be connected with joints, and the joint may include a main body section connected to the pressure strip body and an assembly section connected to the box body 11, and at least part of the main body section may be installed in the installation groove.

[0088] In actual implementation, Figure 2-Figure 3 As shown, 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, and 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, and 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.

[0089] The battery 10 provided in the embodiment of the present application solves the problem that the protective structure 14 alone is not sufficient 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, and realizes 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 during bottom scraping or bottom ball working conditions, thereby further optimizing the safety protection performance of the entire battery 10.

[0090] 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.

[0091] 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 a bottom scraping or bottom ball 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.

[0092] The battery 10 provided in the embodiment of the present application, through the 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 when the bottom is scraped or the bottom ball is in operation, 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 the scraping bottom, thereby optimizing the safety protection performance of the entire battery 10.

[0093] According to some embodiments of the present application, Figure 2-Figure 3As shown, the protective structure 14 may include a plurality of protective structures 14 spaced apart and arranged along the length direction of the end beam 111 , and a plurality of battery cells 12 may be stacked in an array in the accommodating cavity, and the plurality of protective structures 14 may correspond one to one to a plurality of columns of battery cells 12 .

[0094] Here, "a plurality" means 2 or more. For example, in some embodiments, Figure 2-Figure 3 As shown, the protection structure 14 may include four protection structures 14 spaced apart and arranged along the length direction of the end beam 111 , and the four protection structures 14 may correspond one to one to the four columns of battery cells 12 .

[0095] In this embodiment, if Figure 2-Figure 3 As shown, 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 a bottom-scraping or bottom-balling condition, the bottom-scraping protection knot can specifically protect the corresponding column of battery cells 12.

[0096] The battery 10 provided in the embodiment of the present application, through the arrangement of the above-mentioned multiple protection structures 14, combined with the structural design of the relative arrangement of the multiple protection 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, and 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.

[0097] According to some embodiments of the present application, Figure 7 As shown, the maximum height H3 of the protective structure 14 can satisfy: 1mm≤H3≤50mm.

[0098] 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 are not limited here.

[0099] Preferably, the maximum height H3 of the protective structure 14 may satisfy: 5 mm ≤ H3 ≤ 30 mm.

[0100] The battery 10 provided in the embodiment of the present application, through the above-mentioned range limitation of the maximum height H3 of the protective structure 14, prevents the maximum height H3 of the protective structure 14 from being too large, resulting in an excessively large volume of the protective structure 14, thereby reducing the volume of the battery 10 as much as possible, and further improving the energy density of the battery 10; and prevents the maximum height H3 of the protective structure 14 from being too small, resulting in insufficient buffering effect provided by the protective structure 14, thereby strengthening the sacrificial protection capability of the protective structure 14 as much as possible, thereby reducing the impact energy received by the first battery cell 12.

[0101] According to some embodiments of the present application, Figure 8 As shown, the minimum width L of the protective structure 14 can satisfy: 10 mm ≤ L ≤ 50 mm.

[0102] Specifically, the minimum width L of the protective structure 14 can 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.

[0103] Preferably, the minimum width L of the protective structure 14 may satisfy: 10 mm ≤ L ≤ 30 mm.

[0104] It should be noted that in actual design, the width of the protective structure 14 can be uniform along the length direction.

[0105] The battery 10 provided in the embodiment of the present application, through the above-mentioned range limitation on the minimum width L of the protection structure 14, prevents the minimum width L of the protection structure 14 from being too large, resulting in an excessively large volume of the protection structure 14, thereby reducing the volume of the battery 10 as much as possible, and further improving the energy density of the battery 10; and prevents the minimum width L of the protection structure 14 from being too small, resulting in insufficient buffering effect provided by the protection structure 14, thereby strengthening the sacrificial protection capability of the protection structure 14 as much as possible, and further reducing the impact energy received by the first battery cell 12.

[0106] According to some embodiments of the present application, Figure 1-5 As shown, the box body 11 may include a front end beam and a rear end beam. When the battery 10 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 the front end beam may be provided with a protective structure 14.

[0107] In this embodiment, if Figure 1-5 As shown, taking the electric device as vehicle 1 as an example, during the driving process of vehicle 1, when the road condition is bad, the chassis of vehicle 1 is very easy to be scratched with the protrusions in the travel route. Based on the fact that the driving direction of vehicle 1 is forward, when vehicle 1 scrapes the bottom or bottom ball accident occurs, the protrusion usually hits the battery 10 from the front to the rear. In the case that the front end beam can be provided with a protective structure 14, the protrusion first collides with the protective structure 14 located on the front end 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 role of unloading and buffering the impact of the protrusion, the impact force of the protrusion on the battery cell 12 close to the front end beam is almost gone at this time, effectively alleviating the threat of the bottom to the battery cell 12 close to the front end beam.

[0108] 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 condition 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.

[0109] According to some embodiments of the present application, 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 and the rear end beam may be provided with a protective structure 14.

[0110] In this embodiment, if Figure 1-5 As shown, taking the electric device as vehicle 1 as an example, the normal driving direction of vehicle 1 is forward, but vehicle 1 needs to reverse in some special cases. When vehicle 1 reverses, since the driver's line of sight is partially blocked, the chassis of vehicle 1 is easy to be scratched with the protrusions in the reverse route. Since the speed of vehicle 1 under the reversing condition is much smaller than the speed of vehicle 1 under the normal driving condition, the impact force of the protrusions when the vehicle 1 bottoms out when it reverses is much smaller, but it still poses a certain threat to the first battery cell close to the rear end beam. In the case where both the front end beam and the rear end beam can be provided with a protective structure 14, when the vehicle 1 scrapes the bottom or bottom ball accident occurs during the forward movement of the vehicle 1, the protective structure 14 located at the front end beam can first collide with the protrusion to protect the first battery cell 12 close to the front end beam; when the vehicle 1 scrapes the bottom or bottom ball accident occurs during the reverse movement, the protective structure 14 located at the rear end beam can first collide with the protrusion to protect the first battery cell 12 close to the rear end beam.

[0111] The battery 10 provided in the embodiment of the present application has a structural design in which the front end beam and the rear end beam are both 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 scraping the bottom, 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, 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 driving of the electric device, thereby greatly increasing the use width of the battery 10.

[0112] According to some embodiments of the present application, Figure 2-Figure 3 As shown, the battery 10 may further include a buffer 16 , which may be disposed on the bottom surface of the plurality of battery cells 12 , and the buffer 16 may be spaced apart from the pressure strip 15 , and both the buffer 16 and the pressure strip 15 may be located between the plurality of battery cells 12 and the bottom guard plate 13 .

[0113] 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 .

[0114] 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.

[0115] By arranging the buffer member 16 on the bottom surface of the plurality of battery cells 12 and cooperating with the arrangement of the protection structure 14 , double protection of the plurality of battery cells 12 is achieved under the bottom scraping or bottom ball working conditions, further reducing the impact energy received by the first battery cell 12 .

[0116] 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 schemes, and the battery 10 is used to provide electrical energy to the electrical device.

[0117] The electrical device may be any of the aforementioned devices or systems using the battery 10 .

[0118] According to some embodiments of the present application, see Figure 2-Figure 8 As shown, the present application provides a battery 10, comprising: a box body 11, a bottom guard plate 13, a protective structure 14 and a plurality of battery cells 12, wherein the bottom guard plate 13 and the box body 11 define a receiving cavity; the plurality of battery cells 12 are installed in the receiving cavity; the protective structure 14 is installed on the end beam 111 of the box body 11, and the protective structure 14 is located between the end beam 111 and the bottom guard plate 13, and the minimum distance between the protective structure 14 and the bottom guard plate 13 is not greater than the minimum distance between the battery cells 12 and the bottom guard plate 13. The end beam 111 comprises a first sub-beam 1111 and a second sub-beam 1112 connected to each other, the second sub-beam 1112 is located on a side of the first sub-beam 1111 close to the receiving cavity, the protective structure 14 is installed 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 an assembly portion 141 and a raised portion 142. The assembly portion 141 is connected to the end beam 111. The minimum distance between the raised portion 142 and the bottom guard plate 13 is not greater than the minimum distance between the battery cell 12 and the bottom guard plate 13. The protective structure 14 includes a plurality of battery cells 12 arranged in an array and stacked in the accommodating cavity. The plurality of protective structures 14 correspond to the plurality of columns of battery cells 12. The box body 11 includes a front end beam and a rear end beam. When the battery 10 is installed in the vehicle, the front end beam and the rear end beam are arranged in a front-to-back spacing along the driving direction of the vehicle, wherein the front end beam is provided with a protective structure 14; or, both the front end beam and the rear end beam are provided with a protective structure 14.

[0119] When the explosion-proof valve of the battery cell 12 is facing the bottom guard plate 13, the protrusion 142 and the explosion-proof valve are arranged opposite to each other, and the length of the protrusion 142 is greater than the length of the explosion-proof valve. The battery 10 also includes: a pressure strip 15, which is connected to the box body 11 and 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. The length of the protrusion 142 is less than the minimum distance between the farthest ends of the two electrode terminals of the battery cell 12; 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 is not less than the minimum distance between the farthest ends of the two electrode terminals of the battery cell 12.

[0120] 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 satisfy: 1mm≤H2-H1≤50mm; the maximum height H3 of the protective structure 14 satisfies: 1mm≤H3≤50mm; the minimum width L of the protective structure 14 satisfies: 10mm≤L≤50mm.

[0121] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0122] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope 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 accommodation 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 a 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, 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 claim 1, characterized in that The protective structure includes an assembly portion and a protrusion portion, the assembly portion is connected to the end beam, the protrusion portion protrudes from the assembly portion toward the bottom guard plate, and the minimum distance from the protrusion 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 structure comprises a plurality of protective structures arranged at intervals along the length direction of the end beam, the plurality of battery cells are stacked in an array and arranged 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 7, 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 7, 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 7, 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 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: A battery as claimed in any one of claims 1 to 11.

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