Battery and electric device

Abstract

The present application belongs to the technical field of batteries. Provided are a battery and an electric device. The battery comprises: a case, which has a cavity; a battery cell group, which is accommodated in the cavity and comprises a plurality of arranged battery cells; and a support plate, which is mounted in the cavity, wherein the battery cell group is mounted onto the support plate so that the support plate supports the plurality of battery cells, and the support plate is insulated from the case.

Description

Batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number: 202311419402.0 and application date of October 30, 2023, 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 technical field of batteries, and more particularly, to a battery and an electrical device. Background Art

[0004] Typically, batteries are designed with equal potential between the casing and the support plate of the battery pack. When a single battery cell loses control, the insulation between the cell and the support plate becomes damaged, causing the support plate, casing, and battery cell to become equal potential. High-temperature smoke damages the insulation of the high-voltage components of the remaining cells, sparking between the casing and the battery pack, leading to double-point insulation failure and a potential safety hazard.

[0005] Summary of the Invention

[0006] The present application provides a battery and an electrical device to solve the problem that thermal runaway of a battery cell in the battery can easily lead to a double-point insulation failure scenario in the battery, thereby posing a safety hazard.

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

[0008] A box body having a cavity;

[0009] a battery cell group housed in the cavity, the battery cell group comprising a plurality of arranged battery cells;

[0010] A support plate is installed in the cavity, the battery cell group is installed on the support plate so that the support plate supports the multiple battery cells, and the support plate is insulated from the box.

[0011] In the above technical solution, the probability of double-point insulation failure during thermal runaway of the battery cell can be reduced, thereby improving the safety of the battery.

[0012] In some embodiments, the insulation resistance between the support plate and the box is R1, which satisfies: R1 ≥ 1 MΩ.

[0013] In the above technical solution, the insulation requirements between the battery cell and the box are met, the insulation effect is better, the breakdown probability is reduced, and the safety of the battery is guaranteed.

[0014] In some embodiments, the support plate comprises a plastic member.

[0015] In the above technical solution, by setting the support plate to be made of plastic material, the insulation effect is better, the production cost is low, the installation is simple, and it is easy to expand the production scale.

[0016] In some embodiments, the support plate is connected to the box.

[0017] In the above technical solution, the support plate is connected to the box body to improve the overall structural strength of the battery and enhance the stability in use.

[0018] In some embodiments, the support plate includes a first part and a second part connected to each other, the battery cell group is installed on the first part, the second part is connected to the box, and the first part is a metal part and the second part is a plastic part.

[0019] In the above technical solution, by setting the support plate into the first part and the second part, the first part can perform heat exchange with the battery cell group to improve the stability of the battery cell group, and the second part is a plastic part that can play an effective insulation effect.

[0020] In some embodiments, one of the first part and the second part is provided with a protrusion, and the other is provided with a groove, and the protrusion is embedded in the groove to connect the first part and the second part.

[0021] In the above technical solution, the first part and the second part are connected by providing a protrusion and a groove, thereby improving the connection strength between the first part and the second part and improving the overall structural strength.

[0022] In some embodiments, the first part includes a main board body and the raised portion protruding from the outer peripheral surface of the main board body toward the second part, the battery cell group is installed on the main board body, the thickness of the raised portion is less than the thickness of the main board body, the second part is arranged around the main board body, and the second part has the groove on the side facing the first part.

[0023] In the above technical solution, the provision of the protrusion and the groove can enhance the connection strength between the first part and the second part, enhance the overall structural strength of the support plate, and enhance the stability of the battery during use.

[0024] In some embodiments, the support plate is provided with a mounting hole, wherein the mounting hole is used for passing a fastener to connect the support plate and the box body;

[0025] The mounting hole passes through the second portion along the thickness direction of the support plate;

[0026] or,

[0027] The mounting hole passes through the protrusion and the second portion along a thickness direction of the support plate.

[0028] In the above technical solution, the connection strength between the support plate and the box body is higher and the stability is better.

[0029] In some embodiments, the support plate is a metal part, the support plate is spaced apart from the box, a connecting plate is provided between the side of the support plate away from the battery cell group and the box, the connecting plate is an insulating part and is respectively connected to the support plate and the box.

[0030] In the above technical solution, by providing a connecting plate, the production and processing difficulty is low, the assembly is easy, the production cost is reduced, and the probability of double-point insulation failure of the battery is reduced, thereby improving safety performance.

[0031] In some embodiments, the support plates are provided in plurality, the plurality of support plates are spaced apart from each other, and each support plate supports at least one battery cell group.

[0032] In the above technical solution, multiple support plates are provided to reduce the probability of short circuit and high-voltage breakdown of the battery and improve the safety performance of the battery.

[0033] In some embodiments, the battery cell group is provided in plurality, and the plurality of battery cell groups are provided in a one-to-one correspondence with the plurality of support plates.

[0034] In the above technical solution, the arrangement and assembly of the battery cell group and the support plate are facilitated, and the arrangement density of multiple battery cells on the support plate is improved, which is convenient for management.

[0035] In some embodiments, at least one of the connecting plates has a protrusion, and the protrusion extends into the gap between two adjacent support plates.

[0036] In the above technical solution, by providing protrusions on the connecting plate, the insulation design between different support plates is made more stable, thereby improving the safety performance of the battery.

[0037] In some embodiments, the insulation resistance between two adjacent support plates is R2, which satisfies: R2 ≥ 1 KΩ.

[0038] In the above technical solution, the insulation resistance between two adjacent support plates is controlled by limiting the minimum value of the insulation resistance R2 between the two adjacent support plates to ensure the insulation effect between different support plates and improve the safety of the battery.

[0039] In some embodiments, in the same battery cell group mounted on the same support plate, the potential difference between the housings of two adjacent battery cells is Ui , satisfying: U i ≤50V.

[0040] In the above technical solution, by setting the potential difference U between the shells of the two battery cells i to the maximum value to reduce the chance of ignition and improve battery safety.

[0041] In some embodiments, U i ≤20V.

[0042] In the above technical solution, by further defining that in the same battery cell group on the same support plate, the potential difference U between the shells of two adjacent battery cells is i range to further reduce the risk of ignition.

[0043] In some embodiments, in the same battery cell group mounted on the same support plate, the maximum potential difference between the housings of two adjacent battery cells is U max , the volume energy density of the battery cell is E, which satisfies:

[0044] 1.05*10 3 Wh*V / L≤E*U max ≤4*10 4 Wh*V / L.

[0045] In the above technical solution, by defining E*U max The maximum and minimum values ​​of the battery voltage are set to reduce the probability of thermal runaway when two battery cells are in thermal runaway, while ensuring that the battery has a high cost performance.

[0046] In some embodiments, 300Wh / L≤E≤800Wh / L, 3.5V≤U max ≤50V.

[0047] In the above technical solution, by limiting the maximum value U of the potential difference between the shells of two adjacent battery cells max The range of the volume energy density E of the battery cell can make the battery cell more cost-effective and less likely to cause fire.

[0048] In some embodiments, 1.05*10 3 Wh*V / L≤E*U max ≤1.6*10 4 Wh*V / L, 3.5V≤U max ≤20V.

[0049] In the above technical solution, by further defining E*U max and U maxrange to further enhance battery safety.

[0050] In some embodiments, a flow channel for circulating a heat exchange medium is provided in the support plate, and the heat exchange medium is used to adjust the temperature of the battery cell. The flow channels of the plurality of support plates are connected through a connecting portion, and the connecting portion is an insulating member.

[0051] In the above technical solution, while ensuring the insulation design, the flow channels of each support plate are connected, which facilitates the thermal management design of the battery cell.

[0052] In some embodiments, in two adjacent battery cell groups mounted on two adjacent support plates, the maximum potential difference between the shells of the two adjacent battery cells belonging to the two adjacent battery cell groups is U1, the resistance of the heat exchange medium in the connecting portion is R3, and the following conditions are satisfied:

[0053] 0.05V / KΩ≤U1 / R3≤400V / KΩ, wherein R3=ρL / S, ρ is the conductivity of the heat exchange medium, L is the length of the heat exchange medium flowing in the connecting portion, and S is the flow cross-sectional area of ​​the connecting portion.

[0054] In the above technical solution, the range of U1 / R3 is limited to ensure safety performance when the connection part is provided and to control production costs.

[0055] In some embodiments, 50V≤U1≤400V, 1KΩ≤R3≤1000KΩ.

[0056] In the above technical solution, the value ranges of U1 and R3 are limited to improve the safety performance of the battery and control the production and design costs of the battery.

[0057] In some embodiments, 0.05V / KΩ≤U1 / R3≤200V / KΩ.

[0058] In the above technical solution, by limiting the value range of U1 / R3, the battery is safer.

[0059] In some embodiments, the side wall of the battery cell provided with the pressure relief mechanism is connected to the support plate, and the support plate has a relief structure arranged opposite to the pressure relief mechanism.

[0060] In the above technical solution, an avoidance structure is provided on the support plate to facilitate smooth opening of the pressure relief mechanism, thereby improving the safety performance of the battery.

[0061] In some embodiments, the avoidance structure corresponds one-to-one with the pressure relief mechanism;

[0062] Alternatively, each of the avoidance structures corresponds to a plurality of the pressure relief mechanisms.

[0063] In some embodiments, the avoidance structure includes a through hole provided in the support plate.

[0064] In the above technical solution, the through hole is provided to effectively avoid the action of the pressure relief mechanism, thereby ensuring safety.

[0065] In some embodiments, the avoidance structure includes an avoidance groove provided on the support plate, and a notch of the avoidance groove faces the pressure relief mechanism.

[0066] In the above technical solution, an avoidance groove is provided to effectively avoid the action of the pressure relief mechanism, thereby ensuring safety and reducing the processing difficulty.

[0067] In some embodiments, the depth of the avoidance groove is H, which satisfies: 2mm≤H≤10mm; and / or the bottom wall thickness of the avoidance groove is h, which satisfies: 0.1mm≤h≤2mm.

[0068] In the above technical solution, the design parameters of the avoidance groove are limited to ensure that the pressure relief mechanism can work normally and ensure the safety of the battery.

[0069] In some embodiments, the support plates are provided in plurality, the plurality of support plates are spaced apart from each other, and the avoidance structure includes an avoidance gap between two adjacent support plates.

[0070] In the above technical solution, the avoidance gap is provided to serve as an avoidance pressure relief mechanism, which simplifies production and processing and is beneficial to reducing production costs.

[0071] In a second aspect, an embodiment of the present application provides an electrical device, including:

[0072] The battery as described in any of the above embodiments is used to provide electrical energy.

[0073] In the above technical solution, by using the battery as described in the above embodiment, the probability of double-point insulation failure occurring during thermal runaway of the battery cells in the battery is low, thereby improving the safety of the battery and further improving the safety and stability of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] 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.

[0075] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0076] FIG2 is one of the structural exploded views of a battery provided in some embodiments of the present application;

[0077] FIG3 is a schematic diagram of a cross-sectional structure of a battery provided in some embodiments of the present application;

[0078] FIG4 is a second exploded view of the structure of a battery provided in some embodiments of the present application;

[0079] FIG5 is a second schematic diagram of a cross-sectional structure of a battery provided in some embodiments of the present application;

[0080] Figure 6 is an enlarged view of point A in Figure 5;

[0081] FIG7 is a third schematic diagram of a cross-sectional structure of a battery provided in some embodiments of the present application;

[0082] Figure 8 is an enlarged view of point B in Figure 7;

[0083] FIG9 is a third exploded view of the structure of a battery provided in some embodiments of the present application;

[0084] FIG10 is a fourth schematic diagram of a cross-sectional structure of a battery provided in some embodiments of the present application;

[0085] FIG11 is a fourth exploded view of the structure of a battery provided in some embodiments of the present application;

[0086] FIG12 is a fifth schematic diagram of a cross-sectional structure of a battery provided in some embodiments of the present application;

[0087] Figure 13 is an enlarged view of point C in Figure 12;

[0088] FIG14 is a sixth schematic diagram of a cross-sectional structure of a battery provided in some embodiments of the present application;

[0089] Figure 15 is an enlarged view of point D in Figure 14;

[0090] FIG16 is a fifth exploded view of the structure of a battery provided in some embodiments of the present application;

[0091] FIG17 is a seventh schematic diagram of a cross-sectional structure of a battery provided in some embodiments of the present application;

[0092] FIG18 is a sixth exploded view of the structure of a battery provided in some embodiments of the present application;

[0093] FIG19 is one of the exploded views of a partial structure of a battery provided in some embodiments of the present application;

[0094] FIG20 is a second exploded view of a partial structure of a battery provided in some embodiments of the present application;

[0095] FIG21 is a third exploded view of a partial structure of a battery provided in some embodiments of the present application;

[0096] FIG22 is a schematic diagram of a partial cross-sectional structure of a battery provided in some embodiments of the present application;

[0097] Figure 23 is an enlarged view of point E in Figure 22;

[0098] FIG24 is a fourth exploded view of a partial structure of a battery provided in some embodiments of the present application;

[0099] FIG25 is a fifth exploded view of the local structure of a battery provided in some embodiments of the present application.

[0100] Figure 1: Vehicle 1, battery 10, motor 20, controller 30; battery cell group 11, battery cell 111, pressure relief mechanism 1111; housing 12, bottom plate 121, top cover 122, frame 123, cavity 124; support plate 13, first part 131, main body 1311, protrusion 1312, second part 132, mounting hole 1321, flow channel 133, avoidance structure 134, through hole 1341, avoidance groove 1342, avoidance gap 1343; connecting plate 14, protrusion 141; connecting part 15. DETAILED DESCRIPTION

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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).

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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 important role. A battery consists of a housing and multiple cells housed within it. As a core component in new energy vehicles, batteries have high requirements for both safety and cycle life.

[0112] In typical batteries, the housing and the support plate of the battery pack are designed to be at equal potential. When a battery cell loses control, the insulation between the cell and the support plate is damaged, resulting in an equal potential between the support plate, the housing, and the battery cell. High-temperature smoke can damage the insulation of the high-voltage components of the remaining cells, sparking between the housing and the battery pack, causing double-point insulation failure and posing a safety hazard.

[0113] Based on the above considerations, in order to solve the problem that thermal runaway of a battery cell in the battery may easily lead to the occurrence of double-point insulation failure in the battery, thereby causing safety hazards, the present application designs a battery, including a box, a support plate and a battery cell group, the box has a cavity, the battery cell group is accommodated in the cavity, the battery cell group includes a plurality of arranged battery cells, the support plate is installed in the cavity, the battery cell group is installed on the support plate so that the support plate supports the plurality of battery cells, and the support plate is insulated from the box.

[0114] In a battery of this structure, an insulation arrangement is provided between the support plate and the casing. Even if the insulation between the battery cell and the support plate fails, the insulation arrangement between the support plate and the casing prevents the battery cell from being easily connected to the casing, thereby reducing the possibility of double-point insulation failure and improving the safety performance of the battery.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] In order to meet different power requirements, the battery 10 may include a plurality of battery cells 111 , wherein the plurality of battery cells 111 may be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series and parallel connection.

[0119] As shown in Figure 2, it is an exploded view of the structure of the battery 10 of an embodiment of the present application. The battery 10 includes a case 12 and a plurality of battery cells 111, and the battery cells 111 are used to be accommodated in the case 12. Among them, the case 12 is used to provide an assembly space for the battery cells 111, and the case 12 can adopt a variety of structures. In some embodiments, the case 12 may include a bottom plate 121, a top cover 122 and a frame 123. The frame 123 may be a hollow structure with open ends. The bottom plate 121 and the top cover 122 are respectively covered on the open sides of the frame 123. The bottom plate 121, the top cover 122 and the frame 123 jointly define a cavity 124, which is an assembly space for accommodating the battery cells 111. Of course, the case 12 formed by the bottom plate 121, the top cover 122 and the frame 123 can be in various shapes, such as a cylinder, a cuboid, etc.

[0120] In the battery 10, the multiple battery cells 111 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 111. The multiple battery cells 111 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell group 111 is housed within the housing 12. Alternatively, the battery 10 can be configured such that the multiple battery cells 111 are first connected in series, in parallel, or in a hybrid connection to form a battery cell group 11, and the multiple battery cell groups 11 are then connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 12. The battery 10 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 111.

[0121] Referring to Figure 2 , the battery 10 includes a plurality of battery cell groups 11 , each of which includes a plurality of battery cells 111 . The battery cells 111 of each battery cell group 11 are arranged along a first direction X, and the plurality of battery cell groups 11 are arranged along a second direction Y. The first direction X and the second direction Y are the length and width directions of the housing 12 , respectively, and the first direction X and the second direction Y are perpendicular to each other.

[0122] Each battery cell 111 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 111 can be cylindrical, flat, rectangular, or in other shapes. For example, in FIG3 , the battery cell 111 is in the shape of a rectangular parallelepiped.

[0123] According to some embodiments of the present application, as shown in Figures 2 to 25 , referring to Figure 2 , an embodiment of the present application provides a battery 10 , which may include a box 12 , a battery cell group 11 and a support plate 13 .

[0124] The box body 12 may have a cavity 124, the battery cell group 11 may be accommodated in the cavity 124, the battery cell group 11 may include a plurality of arranged battery cells 111, the support plate 13 may be installed in the cavity 124, the battery cell group 11 may be installed on the support plate 13 so that the support plate 13 supports the plurality of battery cells 111, and the support plate 13 may be insulated from the box body 12.

[0125] The housing 12 may be similar to the housing 12 of the aforementioned embodiment and will not be described in detail here. In this embodiment, the housing 12 may be a rectangular parallelepiped. The battery cell group 11 may be housed within the cavity 124. The battery cell group 11 may include multiple battery cells 111 to increase the capacity of the battery 10. The specific number of battery cells 111 included in a battery cell group 11 is not limited here and is designed based on actual needs.

[0126] Among them, the support plate 13 is installed in the cavity 124, and the battery cell group 11 is installed on the support plate 13. The battery cell group 11 can be fixedly connected to the support plate 13 by bonding, so that the battery cell group 11 is connected to the box 12 through the support plate 13. Among them, the support plate 13 and the box 12 are relatively insulated, so that the battery cell group 11 and the box 12 are relatively insulated. Even if the battery cell 111 in the battery cell group 11 has thermal runaway, because the battery cell 111 is insulated from the box 12, the probability of double-point insulation failure can be reduced, thereby improving safety.

[0127] In actual implementation, the support plate 13 is first installed in the box body 12 and the support plate 13 is insulated from the box body 12, and then the battery cell group 11 is installed on the support plate 13, and multiple battery cells 111 are fixed on the support plate 13 by bonding. In the event that a battery cell 111 suffers from thermal runaway, because the battery cell 111 is relatively insulated from the box body 12, even if the smoke generated by the battery cell 111 causes the insulation design of the high-voltage components of the remaining battery cells 111 to fail, only a single-point insulation failure will occur, thereby reducing the probability of double-point insulation failure and improving the safety performance of the battery 10.

[0128] The battery 10 provided in the embodiment of the present application can reduce the probability of double-point insulation failure occurring when the battery cell 111 experiences thermal runaway, thereby improving the safety of the battery 10 .

[0129] According to some embodiments of the present application, the insulation resistance R1 between the support plate 13 and the box body 12 may satisfy: R1 ≥ 1 MΩ. In some embodiments, R1 may be 1 MΩ, 2 MΩ, 3 MΩ, 5 MΩ, 10 MΩ, or other resistance values ​​greater than or equal to 1 MΩ, which are not limited herein.

[0130] In this embodiment, by limiting the minimum value of the insulation resistance R1 between the support plate 13 and the box body 12, the insulation requirements between the support plate 13 and the box body 12 are met, and then the insulation requirements between the battery cell 111 and the box body 12 are met, the insulation effect is better, the breakdown probability is reduced, and the safety of the battery 10 is ensured.

[0131] According to some embodiments of the present application, as shown in FIG. 2 and FIG. 3 , the support plate 13 may include a plastic member.

[0132] In this embodiment, the support plate 13 may include a plastic part, and the support plate 13 is entirely made of a plastic part. The material of the plastic part may be polyolefin or polypropylene, etc., and no specific limitation is made here.

[0133] According to the support plate 13 provided in the embodiment of the present application, by setting the support plate 13 to a plastic material, the insulation effect is better, the production cost is low, the installation is simple, and the production scale is easy to expand.

[0134] According to some embodiments of the present application, as shown in FIG. 2 to FIG. 8 , the support plate 13 may be connected to the box body 12 .

[0135] In this embodiment, the support plate 13 can be directly connected to the box body 12, so that the connection strength between the support plate 13 and the box body 12 is high, and the structure is relatively stable, thereby improving the overall structural strength.

[0136] In actual implementation, the support plate 13 can be set in a flat plate shape. The support plate 13 can be installed between the bottom plate 121 and the frame 123 and fixedly connected by fasteners. The installation is simple and the insulation effect is good.

[0137] According to the embodiment of the present application, the support plate 13 is connected to the box body 12 to improve the overall structural strength of the battery 10 and enhance the stability in use.

[0138] According to some embodiments of the present application, as shown in Figures 4 to 8, the support plate 13 may include a first part 131 and a second part 132 that are connected to each other, the battery cell group 11 may be installed on the first part 131, the second part 132 may be connected to the box body 12, and the first part 131 may be a metal part, and the second part 132 may be a plastic part.

[0139] In this embodiment, the support plate 13 may include a first portion 131 and a second portion 132. The first portion 131 may be a metal component, and the second portion 132 may be a plastic component. The first portion 131 and the second portion 132 are connected to form the support plate 13. Metal components have good thermal conductivity and can be used as water-cooled plates. Flow channels can be provided within the metal components to circulate a heat exchange medium to regulate the temperature of the battery cells 111 and improve the performance and stability of the battery 10. Plastic components have good insulation and high structural strength, making them excellent insulating components.

[0140] The battery cell group 11 is installed on the first part 131, and heat exchange is performed on the battery cell group 11 through the metal parts to adjust the temperature of the battery cell 111 and improve the working performance of the battery cell 111. The plastic parts are connected to the metal parts. On the one hand, the plastic parts support the metal parts and the battery cell group 11. On the other hand, the plastic parts are installed on the box body 12 to insulate the metal parts, the battery cell group 11 and the box body 12, thereby ensuring insulation.

[0141] In actual implementation, the second part 132 can be arranged around the circumference of the first part 131. The second part 132 is fixedly installed between the frame 123 and the bottom plate 121 by fasteners, so that the second part 132 plays a certain supporting role for the first part 131, while ensuring the insulation between the first part 131 and the box body 12.

[0142] According to the support plate 13 provided in the embodiment of the present application, by setting the support plate 13 into a first part 131 and a second part 132, the first part 131 can perform heat exchange with the battery cell group 11 to improve the stability of the battery cell group 11, and the second part 132 is a plastic part that can play an effective insulation effect.

[0143] According to some embodiments of the present application, as shown in Figures 4 to 8, one of the first part 131 and the second part 132 may be provided with a protrusion 1312, and the other may be provided with a groove, and the protrusion 1312 may be embedded in the groove to connect the first part 131 and the second part 132.

[0144] In this embodiment, a protrusion 1312 can be provided on the first portion 131 and a groove can be provided on the second portion 132; alternatively, a groove can be provided on the first portion 131 and a protrusion 1312 can be provided on the second portion 132. The protrusion 1312 is embedded in the groove to achieve a fixed connection between the first portion 131 and the second portion 132, resulting in a simple structure and high strength.

[0145] There may be a plurality of raised portions 1312 , and a plurality of groove portions corresponding one to one with the raised portions 1312 . By providing a plurality of raised portions 1312 and a plurality of groove portions, the strength is improved and the force is more evenly distributed.

[0146] According to the embodiment of the present application, the first part 131 and the second part 132 are connected by providing the protrusion 1312 and the groove, thereby improving the connection strength between the first part 131 and the second part 132 and improving the overall structural strength.

[0147] According to some embodiments of the present application, as shown in Figures 4 to 8, the first part 131 may include a main board body 1311 and a protrusion 1312 protruding from the outer peripheral surface of the main board body 1311 toward the second part 132, the battery cell group 11 can be installed on the main board body 1311, the thickness of the protrusion 1312 can be less than the thickness of the main board body 1311, the second part 132 can be arranged around the main board body 1311, and the second part 132 has a groove on the side facing the first part 131.

[0148] In this embodiment, the first portion 131 may include a main plate body 1311 and a protrusion 1312 . The main plate body 1311 is used to mount the battery cell group 11 . The battery cell group 11 may be fixedly connected to the main plate body 1311 by bonding.

[0149] The raised portion 1312 can protrude from the outer circumference of the main plate 1311 toward the second portion 132. The thickness of the raised portion 1312 can be less than that of the main plate 1311, thereby forming a step between the raised portion 1312 and the main plate 1311. The second portion 132 can be disposed around the main plate 1311. The side of the second portion 132 facing the first portion 131 can have a groove. The raised portion 1312 and the groove can be embedded to achieve a fixed connection, thereby enhancing the connection strength between the first portion 131 and the second portion 132, improving the overall structural strength of the support plate 13, and improving the stability of the battery 10 during use.

[0150] In one example, the protrusion 1312 can be arranged in a ring shape on the outer wall of the main body 1311, and the groove is relatively arranged in a ring shape on the inner side of the second part 132, with a large connection area and simple processing.

[0151] In another example, there may be multiple protrusions 1312 , which are spaced apart and distributed along the circumference of the main body 1311 , and the grooves and protrusions 1312 are in one-to-one correspondence, resulting in high structural strength and strong anti-deformation ability.

[0152] Among them, the protrusion 1312 can be centered along the thickness direction of the main body 1311, and the groove of the second part 132 can be centered along the thickness direction of the second part 132, so that after the protrusion 1312 is embedded in the groove, limit stops are formed on both sides in the thickness direction to ensure the connection strength between the first part 131 and the second part 132.

[0153] In actual implementation, a flow channel can be provided in the main board body 1311, and a heat exchange medium circulates in the flow channel to form a water-cooled plate structure to regulate the temperature of the battery cell 111. Among them, because the second part 132 is a plastic part, the second part 132 and the first part 131 can be injection molded, and the production and processing are simple. Among them, the surface of the second part 132 in the thickness direction can be flush with the surface of the main board body 1311 in the thickness direction, which is convenient for production, transportation and assembly.

[0154] According to the arrangement of the protrusion 1312 and the groove in the embodiment of the present application, the connection strength between the first portion 131 and the second portion 132 is improved, the overall structural strength of the support plate 13 is improved, and the stability of the battery 10 is improved.

[0155] According to some embodiments of the present application, as shown in FIG. 5 to FIG. 8 , the support plate 13 may be provided with a mounting hole 1321 , and the mounting hole 1321 may be used for passing a fastener to connect the support plate 13 and the box body 12 .

[0156] The housing 12 may include a frame 123 and a bottom plate 121. The frame 123 and the bottom plate 121 may be fixedly connected by fasteners to achieve assembly of the housing 12. The support plate 13 may be provided with mounting holes 1321. When connecting the support plate 13 to the housing 12, the portion of the support plate 13 provided with the mounting holes 1321 may be clamped between the frame 123 and the bottom plate 121. The fasteners may be passed through the frame 123, the mounting holes 1321, and the bottom plate 121 to achieve connection between the support plate 13 and the housing 12.

[0157] To facilitate assembly, the periphery of the support plate 13 is generally aligned with the edge of the box body 12 to prevent the support plate 13 from interfering with the outside world. The mounting hole 1321 is set close to the edge of the support plate 13 for easy installation, wherein the mounting hole 1321 can be set in at least one of the following ways.

[0158] First, as shown in FIG. 5 and FIG. 6 , the mounting hole 1321 may penetrate the second portion 132 along the thickness direction of the support plate 13 .

[0159] In this embodiment, the mounting hole 1321 only passes through the second portion 132 along the thickness direction of the support plate 13, only clamping the second portion 132 between the frame 123 and the bottom plate 121, and connected by fasteners, supporting the first portion 131 and the battery cell group 11 through the second portion 132.

[0160] In actual implementation, when manufacturing the support plate 13 , the second portion 132 can be connected to the first portion 131 first, and then the mounting hole 1321 can be processed on the second portion 132 . This simplifies the production process, improves production efficiency, and saves material costs.

[0161] Secondly, as shown in FIG. 7 and FIG. 8 , the mounting hole 1321 passes through the protrusion 1312 and the second portion 132 along the thickness direction of the support plate 13 .

[0162] In this embodiment, the protrusion 1312 extends outward from the outer surface of the main board body 1311 to between the frame 123 and the bottom plate 121, so that the width of the protrusion 1312 is larger and the depth of the groove of the second part 132 is deeper. The mounting hole 1321 passes through the protrusion 1312 and the second part 132 along the thickness direction of the support plate 13, so that when the support plate 13 is connected to the box body 12, the protrusion 1312 and the second part 132 are clamped together between the frame 123 and the bottom plate 121, and connected by fasteners, so that the fastening force is directly transmitted to the first part 131. Because the first part 131 is a metal part, the structural strength is higher, which improves the connection strength and stability.

[0163] In actual implementation, when making the support plate 13, the main body 1311 and the raised portion 1312 of the first part 131 can be made first, and the mounting hole 1321 can be pre-machined on the raised portion 1312. Then, the second part 132 is connected to the first part 131 by integral injection molding, and the second part 132 is wrapped around the raised portion 1312. Moreover, at least part of the second part 132 covers the inner wall of the pre-machined mounting hole 1321 on the raised portion 1312 to form the mounting hole 1321, so that the raised portion 1312 of the first part 131 is separated and insulated from the box body 12 and the fasteners, ensuring insulation while having high structural strength and good stability.

[0164] The fasteners may be bolt and nut assemblies or rivets, etc., which are not limited here.

[0165] According to the mounting hole 1321 of the embodiment of the present application, the connection strength between the support plate 13 and the box body 12 is higher and the stability is better.

[0166] According to some embodiments of the present application, as shown in Figures 9 to 25, please refer to Figures 9 and 10 for details, the support plate 13 can be a metal part, the support plate 13 can be spaced apart from the box body 12, and a connecting plate 14 can be provided between the side of the support plate 13 facing away from the battery cell group 11 and the box body 12. The connecting plate 14 can be an insulating part and is respectively connected to the support plate 13 and the box body 12.

[0167] In this embodiment, the support plate 13 may be a metal part having high structural strength and good thermal conductivity. A flow channel 133 may be provided in the support plate 13 to circulate a heat exchange medium in the flow channel 133 to adjust the temperature of the battery cell group 11 .

[0168] The support plate 13 can be spaced apart from the case 12, and a connecting plate 14 can be provided between the side of the support plate 13 facing away from the battery cell group 11 and the case 12. The two sides of the connecting plate 14 are respectively connected to the support plate 13 and the case 12, so that the support plate 13 is mounted on the case 12 via the connecting plate 14. The connecting plate 14 can be fixedly connected to the support plate 13 by bonding, and fixedly connected to the case 12 by gluing, so that the support plate 13 and the case 12 are relatively fixed.

[0169] The connecting plate 14 can be an insulating member. By setting the connecting plate 14 as an insulating member and spacing the support plate 13 from the box body 12, insulation is achieved between the support plate 13 and the box body 12. A plurality of connecting plates 14 can be provided, and the plurality of connecting plates 14 are spaced apart to ensure installation strength while reducing material costs.

[0170] According to the embodiment of the present application, by providing the connecting plate 14, the production and processing difficulty is low, the assembly is easy, the production cost is reduced, and the probability of double-point insulation failure of the battery 10 is reduced, thereby improving the safety performance.

[0171] According to some embodiments of the present application, as shown in Figures 11 to 25 , specifically referring to Figures 11 to 13 , a plurality of support plates 13 may be provided, and the plurality of support plates 13 may be spaced apart from each other, and each support plate 13 may support at least one battery cell group 11 .

[0172] In this embodiment, there may be multiple support plates 13, and the multiple support plates 13 are all connected to the box body 12 through the connecting plate 14, so that the multiple support plates 13 are insulated from the box body 12, and the multiple support plates 13 can be spaced apart from each other, so that the multiple support plates 13 are relatively insulated. Each support plate 13 can support at least one battery cell group 11, and the battery cell groups 11 on different support plates 13 are also spaced apart.

[0173] In the event of thermal runaway of a battery cell 111, the insulating layer at the bottom of the battery cell 111 is damaged, which can easily lead to damage to the insulation design between the battery cell 111 and the support plate 13, causing the battery cell 111 to be conductively connected to the support plate 13. In the event of thermal runaway of two battery cells 111 at the same time, the two battery cells 111 may be conductively connected through the support plate 13, causing a short circuit or even high-voltage breakdown in the battery 10, posing a safety hazard.

[0174] By providing multiple support plates 13, when thermal runaway occurs in battery cells 111 on different support plates 13, the battery cells 111 on different support plates 13 are less likely to conduct and form a short circuit due to the relative insulation between the different support plates 13, thereby reducing the probability of short circuit or even high-voltage breakdown of the battery 10 and improving the safety performance of the battery 10.

[0175] Among them, the number of support plates 13 can be two, three, four or more, and the number of battery cell groups 11 on each support plate 13 can be one, two, three or four. The specific number is not limited here and is determined according to the actual requirements of the internal circuit design of the battery 10.

[0176] According to the embodiment of the present application, a plurality of support plates 13 are provided to reduce the probability of short circuit and high-voltage breakdown of the battery 10 and improve the safety performance of the battery 10 .

[0177] According to some embodiments of the present application, a plurality of battery cell groups 11 may be provided, and the plurality of battery cell groups 11 may be provided in a one-to-one correspondence with the plurality of support plates 13 .

[0178] In this embodiment, multiple battery cell groups 11 can be arranged in a one-to-one correspondence with multiple support plates 13, that is, each support plate 13 is provided with a battery cell group 11, which facilitates the arrangement and assembly of the battery cell groups 11 and the support plates 13, and improves the arrangement density of the multiple battery cells 111 on the support plates 13, making management easier.

[0179] According to some embodiments of the present application, as shown in FIG. 14 and FIG. 15 , at least one connecting plate 14 has a protrusion 141 , and the protrusion 141 extends into the gap between two adjacent support plates 13 .

[0180] In this embodiment, at least one connecting plate 14 may have a protrusion 141, and the protrusion 141 may extend into the gap between two adjacent support plates 13 to further isolate the two support plates 13. Even if the battery 10 vibrates or shakes during use, the two support plates 13 will not approach each other and conduct electricity, thereby improving the stability of the insulation structure and the safety performance of the battery 10.

[0181] A connecting plate 14 may be provided on one side of each two adjacent support plates 13 , and a protrusion 141 may be provided on the connecting plate 14 , so that a protrusion 141 is provided in the gap between each two adjacent support plates 13 .

[0182] According to the embodiment of the present application, by providing a protrusion 141 on the connecting plate 14 , the insulation design between different support plates 13 is made more stable, thereby improving the safety performance of the battery 10 .

[0183] According to some embodiments of the present application, the insulation resistance between two adjacent support plates 13 is R2, which may satisfy: R2 ≥ 1 KΩ.

[0184] It is understood that the greater the insulation resistance between different support plates 13, the lower the probability of short circuits and high-voltage breakdown. The closer the distance between two support plates 13, the lower the resistance, while the greater the distance between the two support plates 13, the greater the resistance. Since the distance between two adjacent support plates 13 is the shortest, by limiting the insulation resistance between two adjacent support plates 13, the insulation resistance between each support plate 13 can meet the requirements.

[0185] The minimum value of the insulation resistance R2 between two adjacent support plates 13 is 1KΩ, and R2 can be: 1KΩ, 2KΩ, 3KΩ, 5KΩ, 10KΩ, 100KΩ, 1MΩ or other resistance values ​​greater than or equal to 1KΩ, which is not limited here.

[0186] According to the insulation resistance defined in the embodiment of the present application, by limiting the minimum value of the insulation resistance R2 between two adjacent support plates 13 , the insulation effect between different support plates 13 is ensured, thereby improving the safety of the battery 10 .

[0187] According to some embodiments of the present application, in the same battery cell group 11 mounted on the same support plate 13 , the potential difference between the housings of two adjacent battery cells 111 is Ui, which satisfies: Ui≤50V.

[0188] When two battery cells 111 on the same support plate 13 experience thermal runaway at the same time, the probability of the two battery cells 111 being conductive through the support plate 13 is very high. Therefore, the voltage difference between the two adjacent battery cells 111 reaches a maximum value, thereby reducing the probability of ignition.

[0189] By limiting the maximum value of the potential difference Ui between the shells of the two battery cells 111 , the probability of fire is reduced, thereby improving the safety of the battery 10 .

[0190] The potential difference Ui between the shells of two adjacent battery cells 111 may be 50V, 45V, 40V, 30V, 20V, 10V or other values ​​less than 50V, which is not specifically limited here.

[0191] According to some embodiments of the present application, Ui≤20V.

[0192] In this embodiment, the risk of ignition is further reduced by further limiting the range of the potential difference Ui between the shells of two adjacent battery cells 111 in the same battery cell group 11 on the same support plate 13 .

[0193] The potential difference Ui between the shells of two adjacent battery cells 111 may be 20V, 15V, 10V, 5V, 3.5V or other values ​​less than 20V, which is not specifically limited here.

[0194] According to some embodiments of the present application, in the same battery cell group 11 mounted on the same support plate 13, the maximum potential difference between the shells of two adjacent battery cells 111 can be U max The volume energy density of the battery cell 111 can be E, which can satisfy: 1.05*10 3 Wh*V / L≤E*U max ≤4*10 4 Wh*V / L.

[0195] In this embodiment, the maximum value U of the potential difference between the housings of two adjacent battery cells 111 in the same battery cell group 11 is used. max The product of the volume energy density E of the battery cell 111 can be used to determine the risk of ignition after thermal runaway of two adjacent battery cells 111 in the same battery cell group 11. Referring to Table 1, Table 1 shows the performance of two adjacent battery cells 111 after thermal runaway under conditions of different volume energy densities and different maximum potential differences of the battery cells 111.

[0196] According to Table 1, in Comparative Examples 1-3, in E*U max When the E*U is greater than 40000Wh*V / L, two adjacent battery cells 111 in the same battery cell group 11 may cause ignition after thermal runaway occurs, which may easily cause safety hazards. max When the value is equal to 40000Wh*V / L, two adjacent battery cells 111 in the same battery cell group 11 will experience thermal runaway and then a slight short circuit will occur and generate heat, but no ignition will occur. This is the maximum critical point. max ≤4*10 4 Wh*V / L will not cause ignition, which is safer.

[0197] At the same time, considering the power requirements and characteristics of the battery 10, the volume energy density and potential difference of the battery cell 111 cannot be too low. max to ensure the volume utilization of the battery cell 111 and improve the cost performance of the battery 10.

[0198] Among them, E*U max The value range of E*U is [1050Wh*V / L, 40000Wh*V / L]. In some embodiments, E*U maxIt can be 1050Wh*V / L, 3000Wh*V / L, 5000Wh*V / L, 6000Wh*V / L, 7500Wh*V / L, 8000Wh*V / L, 10000Wh*V / L, 16000Wh*V / L, 32000Wh*V / L, 40000Wh*V / L or other values ​​between 1050Wh*V / L and 40000Wh*V / L.

[0199] Table 1

[0200] According to the embodiment of the present application, by defining E*U max to reduce the probability of ignition when the two battery cells 111 experience thermal runaway, while ensuring that the battery 10 has a high cost-effectiveness.

[0201] According to some embodiments of the present application, the maximum potential difference between the housings of two adjacent battery cells 111 in the same battery cell group 11 may be U max The volume energy density of the battery cell 111 may be E, which may satisfy: 300Wh / L≤E≤800Wh / L, 3.5V≤Umax≤50V.

[0202] It is understandable that if the voltage of the battery cell 111 is low, the battery 10 will need to connect more battery cells 111 in series to obtain the required current and voltage under the same operating power, which will lead to an increase in the proportion of mechanical parts in the battery 10, a decrease in the volume utilization of the effective charging and discharging units, and a reduction in the cost-effectiveness of the battery 10 pack. If the voltage of the battery cell 111 is too high, it will easily cause ignition.

[0203] According to the test data in Table 1, 300Wh / L≤E≤800Wh / L, 3.5V≤U max When the voltage is ≤50V, the battery 10 has a high cost performance and is not prone to ignition.

[0204] Among them, the volume energy density E of the battery cell 111 has a value range of [300Wh / L, 800Wh / L]. In some embodiments, E can be 300Wh / L, 400Wh / L, 500Wh / L, 600Wh / L, 700Wh / L, 800Wh / L or other values ​​between 300Wh / L-800Wh / L, which are not specifically limited here.

[0205] The maximum potential difference U between the shells of two adjacent battery cells 111 in the same battery cell group 11 is max The value range of U is [3.5V, 50V]. In some embodiments, U maxThe value can be 3.5V, 10V, 15V, 20V, 50V or other values ​​between 3.5V and 50V, which are not specifically limited here.

[0206] According to the embodiment of the present application, the maximum value U of the potential difference between the housings of two adjacent battery cells 111 is defined. max The range of the volume energy density E of the battery cell 111 can make the battery cell 111 more cost-effective and less likely to cause ignition.

[0207] According to some embodiments of the application, 1.05*10 3 Wh*V / L≤E*U max ≤1.6*10 4 Wh*V / L, 3.5V≤U max ≤20V.

[0208] In this embodiment, E*U max The value range of E*U can be [1050Wh*V / L, 16000Wh*V / L]. Referring to Table 1, under this value range, the risk of thermal runaway between two adjacent battery cells 111 in the same battery cell group 11 causing slight short circuit heating is low, and the probability of causing fire is lower, which is safer. In some embodiments, E*U max It can be 1050Wh*V / L, 3000Wh*V / L, 5000Wh*V / L, 6000Wh*V / L, 7500Wh*V / L, 8000Wh*V / L, 10000Wh*V / L, 16000Wh*V / L or other values ​​between 1050Wh*V / L and 16000Wh*V / L.

[0209] In this embodiment, U max The value range of can be [3.5V, 20V]. Under this value range, the risk of a slight short circuit and heating caused by thermal runaway between two adjacent battery cells 111 in the same battery cell group 11 is low, and the probability of causing fire is lower, which is safer. In some embodiments, U max The value may be 3.5V, 10V, 15V, 20V or other values ​​between 3.5V and 20V, which are not specifically limited here.

[0210] According to the embodiment of the present application, by further defining E*U max and U max range to further improve the safety of the battery 10.

[0211] According to some embodiments of the present application, as shown in Figures 16 and 17, a flow channel 133 for circulating a heat exchange medium may be provided in the support plate 13. The heat exchange medium is used to regulate the temperature of the battery cell 111. The flow channels 133 of multiple support plates 13 are connected through a connecting portion 15, and the connecting portion 15 is an insulating member.

[0212] In this embodiment, a flow channel 133 for circulating a heat exchange medium may be provided in the support plate 13. The heat exchange medium may be cooling water or a refrigerant, etc. The temperature of the battery cell 111 is regulated by the heat exchange medium to heat up or cool down the battery cell 111, thereby improving the efficiency and service life of the battery cell 111.

[0213] The flow channels 133 of the multiple support plates 13 can be connected through the connecting portion 15 so that the heat exchange medium can flow in the multiple support plates 13, thereby reducing the interface between the flow channels 133 of each support plate 13 and the outside, facilitating installation, and the connecting portion 15 is an insulating part, so that the two support plates 13 are insulated.

[0214] In actual implementation, referring to Figures 16 and 17 , taking the example of two support plates 13 , each support plate 13 is provided with an inlet and an outlet. The inlet of the first of the two support plates 13 is used to connect to the outlet of an external heat exchanger to introduce heat exchange medium into the battery 10. The outlet of the first of the two support plates 13 is connected to the inlet of the second of the two support plates 13 via a connection portion 15 , so that the heat exchange medium circulates through the first of the two support plates 13 and then enters the second, then flows out through the outlet of the second and circulates to the inlet of the heat exchanger, completing one cycle of the heat exchange medium. The inlets and outlets of the two support plates 13 can be located on the same side to reduce the space occupied by the pipe joints and the connection portion 15 , thereby improving the space utilization within the battery 10 .

[0215] According to the connection portion 15 provided in the embodiment of the present application, the flow channels 133 of each support plate 13 are connected while ensuring the insulation design, which facilitates the thermal management design of the battery cell 111.

[0216] According to some embodiments of the present application, in two adjacent battery cell groups 11 mounted on two adjacent support plates 13, the maximum potential difference between the shells of two adjacent battery cells 111 belonging to the two adjacent battery cell groups 11 is U1, and the resistance of the heat exchange medium in the connecting portion 15 is R3, which can satisfy the following conditions:

[0217] 0.05V / KΩ≤U1 / R3≤400V / KΩ, where R3=ρL / S, ρ is the conductivity of the heat exchange medium, L is the length of the heat exchange medium flowing in the connecting portion 15, and S is the flow cross-sectional area of ​​the connecting portion 15.

[0218] It should be noted that although the connecting portion 15 is an insulating component with a high insulation resistance, the heat exchange medium flowing in the connecting portion 15 is generally a conductive material. After the flow channels 133 of the two adjacent support plates 13 are connected through the connecting portion 15, if a battery cell 111 on each of the two adjacent support plates 13 experiences thermal runaway, the voltage between the two battery cells 111 may break through the heat exchange medium and cause a spark, or an electrolytic cell structure may be formed through the heat exchange medium to generate an electrolytic reaction, causing the connection position between the support plate 13 and the connecting portion 15 to heat up, which may cause the connecting portion 15 to soften or even leak the heat exchange medium, posing a safety hazard.

[0219] In this embodiment, in two adjacent battery cell groups 11 installed on two adjacent support plates 13, the maximum potential difference U1 between the shells of two adjacent battery cells 111 belonging to the two adjacent battery cell groups 11 is the maximum voltage that the heat exchange medium in the connecting part 15 can bear. If the potential difference is large, the probability of breakdown of the heat exchange medium is high. Similarly, if the resistance of the heat exchange medium in the connecting part 15 is low, the probability of breakdown through the heat exchange medium is high.

[0220] It is understandable that the resistance of the heat exchange medium depends on the conductivity of the heat exchange medium, the length of the connecting portion 15 and the flow cross-sectional area of ​​the connecting portion 15 .

[0221] In this embodiment, the results of thermal runaway of two adjacent battery cells 111 belonging to two adjacent battery cell groups 11 installed on two adjacent support plates 13 are tested under different U1 / R3 conditions to obtain a reasonable range of U1 / R3. Referring to Table 2, Table 2 shows the performance of thermal runaway of two adjacent battery cell groups 11 and two adjacent battery cell groups 11 installed on two adjacent support plates 13 under different U1 / R3 conditions.

[0222] Table 2

[0223] Table 2 shows that in Comparative Examples 1-3, when U1 / R3 is greater than 400V / KΩ, thermal runaway can occur in two adjacent battery cell groups 11 mounted on two adjacent support plates 13, and in two adjacent battery cells 111 belonging to two adjacent battery cell groups 11, causing sparks, potentially posing a safety hazard. In Example 9, when U1 / R3 is equal to 400V / KΩ, the connection portion 15 heats up significantly, but no sparks occur, representing the maximum critical point. When U1 / R3 is ≤ 400V / KΩ, no sparks occur, indicating a higher safety level.

[0224] Moreover, considering the actual production and processing costs, U1 / R3 has a minimum value, which is 0.05V / KΩ.

[0225] Among them, the value range of U1 / R3 is [0.05V / KΩ, 400V / KΩ]. In some embodiments, U1 / R3 can be 0.05V / KΩ, 0.2V / KΩ, 0.4V / KΩ, 0.5V / KΩ, 2V / KΩ, 4V / KΩ, 50V / KΩ, 200V / KΩ, 400V / KΩ or other values ​​between 0.05V / KΩ-400V / KΩ, which are not specifically limited here.

[0226] According to the embodiment of the present application, the range of U1 / R3 is limited to ensure safety performance when the connecting portion 15 is provided and to control production costs.

[0227] According to some embodiments of the present application, 50V≤U1≤400V, 1KΩ≤R3≤1000KΩ.

[0228] It is understandable that when designing and producing the battery 10, the actual power usage is generally used as the standard. When U1 is large, the output power of the battery 10 is high and the application range is wide. However, when the battery cell 111 experiences thermal runaway, it is easy to cause high-voltage breakdown. Therefore, when U1 is at a maximum value, R3 has a minimum value to reduce safety risks. When U1 is small, safety is higher but the cost-effectiveness is lower. When U1 is at a minimum value, R3 has a maximum value so that the conductivity of the connection 15 between adjacent support plates 13 and the heat exchange medium does not increase the design cost due to excessively high resistance requirements, thereby reducing design difficulty and reducing the risk of leakage caused by an overly long connection 15 or difficulties in pipe arrangement.

[0229] According to the above Table 2, when U1 takes the maximum value of 400V, R3 has a minimum value of 1KΩ, and when U1 takes the minimum value of 50V, R3 has a maximum value of 1000KΩ.

[0230] Among them, the value range of U1 is [50V, 400V]. In some embodiments, U1 can be 50V, 100V, 150V, 200V, 250V, 300V, 400V or other values ​​between 50V-400V, which is not specifically limited here.

[0231] Among them, the value range of R3 is [1KΩ, 1000KΩ]. In some embodiments, R3 can be 1KΩ, 10KΩ, 100KΩ, 300KΩ, 500KΩ, 800KΩ, 1000KΩ or other values ​​between 1KΩ-1000KΩ, which is not specifically limited here.

[0232] According to the embodiment of the present application, the value ranges of U1 and R3 are limited to improve the safety performance of the battery 10 and control the production and design costs of the battery 10.

[0233] According to some embodiments of the present application, 0.05V / KΩ≤U1 / R3≤200V / KΩ.

[0234] In this embodiment, the value range of U1 / R3 can be [0.05V / KΩ, 200V / KΩ]. Referring to Table 2, in Example 6, when U1 / R3 = 200V / KΩ, in two adjacent battery cell groups 11 installed on two adjacent support plates 13, after thermal runaway occurs in two adjacent battery cell groups 11 and two adjacent battery cells 111, the connection portion 15 only experiences a small temperature rise. Therefore, when U1 / R3 ≤ 200V / KΩ, safety is higher.

[0235] In some embodiments, U1 / R3 can be 0.05V / KΩ, 0.2V / KΩ, 0.4V / KΩ, 0.5V / KΩ, 2V / KΩ, 4V / KΩ, 50V / KΩ, 200V / KΩ or other values ​​between 0.05V / KΩ-200V / KΩ, which are not specifically limited here.

[0236] According to the value range of U1 / R3 in the embodiment of the present application, the battery 10 is safer.

[0237] According to some embodiments of the present application, as shown in Figures 18 to 25, the side wall of the battery cell 111 provided with the pressure relief mechanism 1111 can be connected to the support plate 13, and the support plate 13 can have an avoidance structure 134 arranged opposite to the pressure relief mechanism 1111.

[0238] A pressure relief mechanism 1111 may be provided on the side wall of the battery cell 111. The specific form of the pressure relief mechanism 1111 is not limited here, and may be a common pressure relief mechanism 1111 on the market. In the event of thermal runaway of the battery cell 111, the pressure relief mechanism 1111 may actively open the exhaust to reduce the internal pressure of the battery cell 111, thereby preventing the shell of the battery cell 111 from cracking and exploding, and improving safety.

[0239] In this embodiment, the side wall of the battery cell 111 provided with the pressure relief mechanism 1111 can be connected to the support plate 13. By providing an avoidance structure 134 arranged opposite to the pressure relief mechanism 1111 on the support plate 13, the pressure relief mechanism 1111 can be avoided. While the support plate 13 supports the battery cell group 11, the pressure relief mechanism 1111 can be smoothly opened, thereby improving the safety of the battery 10.

[0240] According to the embodiment of the present application, an avoidance structure 134 is provided on the support plate 13 to facilitate smooth opening of the pressure relief mechanism 1111 , thereby improving the safety performance of the battery 10 .

[0241] According to some embodiments of the present application, the avoidance structures 134 may correspond one-to-one to the pressure relief mechanisms 1111 ; or, each avoidance structure 134 may correspond to multiple pressure relief mechanisms 1111 .

[0242] In one example, as shown in Figures 18 and 19, multiple avoidance structures 134 can be set on each support plate 13, and the number of avoidance structures 134 on each support plate 13 is the same as the number of battery cells 111 on the support plate 13, so that the avoidance structures 134 can correspond one-to-one with the pressure relief mechanisms 1111, so as to play an avoidance role for each pressure relief mechanism 1111, reduce the mutual influence between the pressure relief mechanisms 1111, and improve stability.

[0243] In another example, as shown in Figures 20 to 25, when the pressure relief mechanisms 1111 of multiple battery cells 111 are arranged neatly, one or more avoidance structures 134 can be provided on each support plate 13, so that each avoidance structure 134 can correspond to multiple pressure relief mechanisms 1111, can play a role in avoiding the multiple pressure relief mechanisms 1111, and the support plate 13 is easy to process.

[0244] According to some embodiments of the present application, as shown in FIG. 18 and FIG. 19 , the avoidance structure 134 may include a through hole 1341 provided in the support plate 13 .

[0245] In this embodiment, there can be multiple through holes 1341 on each support plate 13, and the multiple through holes 1341 are arranged in a one-to-one correspondence with the multiple pressure relief mechanisms 1111, wherein the cross-sectional size of the through hole 1341 can be the same as the cross-sectional size of the pressure relief mechanism 1111, or the cross-sectional size of the through hole 1341 can be slightly larger than the cross-sectional size of the pressure relief mechanism 1111, so as to effectively avoid the action of the pressure relief mechanism 1111 and ensure safety.

[0246] According to some embodiments of the present application, as shown in FIG. 20 to FIG. 23 , the avoidance structure may include an avoidance groove 1342 provided on the support plate 13 , and the notch of the avoidance groove 1342 may face the pressure relief mechanism 1111 .

[0247] In this embodiment, the avoidance structure may include an avoidance groove 1342 provided on the support plate 13, with the notch of the avoidance groove 1342 facing the pressure relief mechanism 1111. When the pressure relief mechanism 1111 is opened, it can move into the avoidance groove 1342, thereby avoiding the pressure relief mechanism 1111. The avoidance groove 1342 may extend along the arrangement direction of the battery cells 111, and one or more avoidance grooves 1342 may be provided along the arrangement direction of the battery cells 111. This allows one avoidance groove 1342 to correspond to multiple pressure relief mechanisms 1111, thus reducing the processing difficulty.

[0248] According to some embodiments of the present application, the depth of the avoidance groove 1342 is H, which may satisfy: 2mm≤H≤10mm; and / or the bottom wall thickness of the avoidance groove 1342 is h, which may satisfy: 0.1mm≤h≤2mm.

[0249] When the pressure relief mechanism 1111 is open, it requires a certain amount of room to maneuver. By limiting the minimum depth H of the escape groove 1342, the pressure relief mechanism 1111 has sufficient room to maneuver. Furthermore, in the event of thermal runaway of the battery cell 111, the pressure relief mechanism 1111 opens to discharge high-temperature, high-pressure gas. This high-temperature, high-pressure gas can break through the bottom wall of the escape groove 1342 and exit the escape groove 1342. By limiting the maximum thickness h of the bottom wall of the escape groove 1342, the discharged gas can easily break through the bottom wall of the escape groove 1342 and be discharged smoothly into the housing 12.

[0250] It is understandable that, depending on the processing technology and actual production requirements, if the depth H of the avoidance groove 1342 is too large, it will occupy more space and reduce space utilization; similarly, if the bottom wall thickness h of the avoidance groove 1342 is too small, the processing technology requirements are high, which increases production costs.

[0251] In this embodiment, the depth H of the avoidance groove 1342 has a value range of [2mm-10mm]. In some embodiments, the depth H of the avoidance groove 1342 can be 2mm, 4mm, 6mm, 8mm, 10mm or other values ​​between 2mm-10mm, which is not limited here; the bottom wall thickness h of the avoidance groove 1342 has a value range of [0.1mm-2mm]. In some embodiments, the bottom wall thickness h of the avoidance groove 1342 can be 0.1mm, 0.4mm, 0.8mm, 1.2mm, 1.6mm, 2mm or other values ​​between 0.1mm-2mm, which is not limited here.

[0252] According to the embodiment of the present application, the design parameters of the avoidance groove 1342 are limited to ensure that the pressure relief mechanism 1111 can work normally and the safety of the battery 10 is guaranteed.

[0253] According to some embodiments of the present application, as shown in Figures 24 and 25, the support plate 13 can be set to multiple, and the multiple support plates 13 can be spaced apart from each other. The avoidance structure 134 may include an avoidance gap 1343 between two adjacent support plates 13.

[0254] In this embodiment, by providing a plurality of support plates 13, the support plates 13 are spaced apart from each other to form an avoidance gap 1343. The plurality of pressure relief mechanisms 1111 of each battery cell group 11 have at least one avoidance gap 1343 corresponding thereto, so that the pressure relief mechanism 1111 can face the avoidance gap 1343 between two adjacent support plates 13. The avoidance structure 134 may include the avoidance gap 1343 between two adjacent support plates 13. The avoidance gap 1343 can be used to avoid the pressure relief mechanism 1111. The production and processing are simple, which is beneficial to reducing production costs.

[0255] 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.

[0256] The power-consuming device may be any of the aforementioned devices or systems using the battery 10 .

[0257] According to a first embodiment of the present application, as shown in FIG. 2 and FIG. 3 , the present application provides a battery 10 , which includes a box 12 , a battery cell group 11 , and a support plate 13 .

[0258] The box body 12 includes a bottom plate 121, a top cover 122 and a frame 123. The frame 123 is a hollow structure with both ends open. The bottom plate 121 and the top cover 122 respectively cover the open sides of the frame 123. The bottom plate 121, the top cover 122 and the frame 123 together define a cavity 124.

[0259] The battery cell group 11 is housed in the cavity 124 . The battery cell group 11 includes a plurality of battery cells 111 arranged in an array. There may be a plurality of battery cell groups 11 .

[0260] The support plate 13 is mounted within the cavity 124. A plurality of mounting holes 1321 are provided on the periphery of the support plate 13, spaced apart along its circumference. These holes 1321 extend through the thickness of the support plate 13. The periphery of the support plate 13 is clamped between the frame 123 and the bottom plate 121. Fasteners passing through the mounting holes 1321 secure the support plate 13 to the housing 12. The support plate 13 is a plastic component. The battery cell assembly 11 is mounted on the support plate 13 and supports the multiple battery cells 111 via the support plate 13, ensuring relative insulation between the multiple battery cells 111 and the housing 12. The insulation resistance R1 between the support plate 13 and the housing 12 is ≥ 1MΩ.

[0261] According to a second embodiment of the present application, as shown in FIG. 4 to FIG. 6 , the present application provides a battery 10 , which includes a box 12 , a battery cell group 11 and a support plate 13 .

[0262] The design of the box 12 and the battery cell group 11 refers to the first embodiment and will not be described in detail here.

[0263] The present embodiment differs from the first embodiment in that, in the second embodiment, the support plate 13 includes a first portion 131 and a second portion 132. The first portion 131 is a metal component, and the second portion 132 is a plastic component. The first portion 131 includes a main body 1311 and a raised portion 1312. The battery cell group 11 is supported on the main body 1311. The raised portion 1312 is disposed around the periphery of the main body 1311 and extends outward from the outer wall of the main body 1311. The thickness of the raised portion 1312 is less than that of the main body 1311 and is centered in the thickness direction of the main body 1311. The second portion 132 is disposed around the outside of the main body 1311 and has a groove formed on the inner side of the second portion 132 facing the main body 1311. The raised portion 1312 can be embedded in the groove and fixed in place. The mounting hole 1321 is provided in the second portion 132 to securely connect the second portion 132 to the housing 12. The first portion 131 is supported by the second portion 132.

[0264] According to a third embodiment of the present application, as shown in FIG. 7 and FIG. 8 , the present application provides a battery 10 , which includes a box 12 , a battery cell group 11 and a support plate 13 .

[0265] The design of the box body 12 and the battery cell group 11 refers to the first embodiment, and the design of part of the support plate 13 refers to the second embodiment, which will not be described in detail here.

[0266] The difference between this embodiment and the second embodiment is that the raised portion 1312 extends outward from the outer surface of the main plate body 1311 to the edge of the box body 12, and the second part 132 is covered outside the raised portion 1312, so that the mounting hole 1321 passes through the second part 132 and the raised portion 1312 at the same time, and the raised portion 1312 and the second part 132 are clamped between the frame 123 and the bottom plate 121 at the same time and connected by fasteners, so that the first part 131 is directly connected to the box body 12 through the raised portion 1312.

[0267] According to a fourth embodiment of the present application, as shown in FIG. 9 and FIG. 10 , the present application provides a battery 10 , which includes a box 12 , a battery cell group 11 and a support plate 13 .

[0268] The design of the box 12 and the battery cell group 11 refers to the first embodiment and will not be described in detail here.

[0269] This embodiment differs from the first embodiment in that the battery 10 further includes a connecting plate 14. The support plate 13 is a metal member and is spaced apart from the housing 12. The connecting plate 14 is an insulating member and is disposed between the support plate 13 and the bottom plate 121, connecting to both the support plate 13 and the bottom plate 121. The support plate 13 is insulated from the housing 12 by the connecting plate 14. A plurality of connecting plates 14 may be provided, and the plurality of connecting plates 14 may be spaced apart along the width of the housing 12.

[0270] It should be noted that in the second, third and fourth embodiments, a flow channel 133 may be provided in the metal member, and a heat exchange medium may flow through the flow channel 133 to adjust the temperature of the battery cell 111 through the heat exchange medium.

[0271] According to a fifth embodiment of the present application, as shown in FIG. 11 to FIG. 13 , the present application provides a battery 10 , which includes a box 12 , a battery cell group 11 , a support plate 13 and a connecting plate 14 .

[0272] The configuration of the box 12 , the battery cell group 11 and the connecting plate 14 is similar to that of the fourth embodiment and will not be described in detail here.

[0273] The difference between this embodiment and the fourth embodiment is that there are multiple support plates 13, and the multiple support plates 13 are spaced apart. There are multiple battery cell groups 11, and the multiple battery cell groups 11 are arranged one-to-one with the support plates 13. The insulation resistance R2 between two adjacent support plates 13 is ≥ 1KΩ. In the same battery cell group 11 installed on the same support plate 13, the potential difference between the shells of two adjacent battery cells 111 is U i ≤50V, in some embodiments U i ≤20V.

[0274] In the same battery cell group 11 mounted on the same support plate 13, the maximum potential difference between the shells of two adjacent battery cells 111 is U max , the volume energy density of the battery cell 111 is E. Satisfying 1.05*10 3 Wh*V / L≤E*U max ≤3.2*10 4 Wh*V / L, 300Wh / L≤E≤800Wh / L, 3.5V≤U max ≤50V. In some embodiments, 1.05*10 3 Wh*V / L≤E*U max ≤1.6*10 4 Wh*V / L, 3.5V≤U max ≤20V.

[0275] According to a sixth embodiment of the present application, as shown in FIG. 14 and FIG. 15 , the present application provides a battery 10 , which includes a box 12 , a battery cell group 11 , a support plate 13 and a connecting plate 14 .

[0276] The arrangement of the box body 12 , the battery cell group 11 and the support plate 13 is similar to that of the fifth embodiment and will not be described in detail here.

[0277] The difference between this embodiment and the fifth embodiment is that a protrusion 141 is provided on the side of the connecting plate 14 facing the support plate 13 , and the protrusion 141 extends into the gap between two adjacent support plates 13 to isolate the two adjacent support plates 13 .

[0278] According to the seventh embodiment of the present application, as shown in FIG. 16 and FIG. 17 , the present application provides a battery 10 , which includes a box 12 , a battery cell group 11 , a support plate 13 and a connecting plate 14 .

[0279] The configuration of the box 12 , the battery cell group 11 and the connecting plate 14 is similar to that of the fifth embodiment and will not be described in detail here.

[0280] This embodiment differs from the fifth embodiment in that the battery 10 further includes a connection portion 15. Each support plate 13 is provided with a flow channel 133, through which a heat exchange medium flows. The flow channels 133 of two adjacent support plates 13 are connected via the connection portion 15, allowing the heat exchange medium to circulate within the flow channels 133 of the multiple support plates 13. Each support plate 13 is provided with two interfaces, each for connecting to the ends of the flow channel 133 within the support plate 13. The adjacent interfaces of two adjacent support plates 13 are connected via the connection portion 15, and the two interfaces of each support plate 13 are located on the same side of the longitudinal direction of the housing 12.

[0281] In two adjacent battery cell groups 11 mounted on two adjacent support plates 13, the maximum potential difference between the housings of two adjacent battery cells 111 belonging to the two adjacent battery cell groups 11 is U1, and the resistance of the heat exchange medium in the connecting portion 15 is R3, satisfying the following conditions: 0.05V / KΩ≤U1 / R3≤400V / KΩ, 50V≤U1≤400V, and 1KΩ≤R3≤1000KΩ. In some embodiments, 0.05V / KΩ≤U1 / R3≤200V / KΩ.

[0282] According to an eighth embodiment of the present application, as shown in FIG. 18 and FIG. 19 , the present application provides a battery 10 , which includes a box 12 , a battery cell group 11 , a support plate 13 and a connecting plate 14 .

[0283] The configuration of the box 12 , the battery cell group 11 and the connecting plate 14 is similar to that of the fifth embodiment and will not be described in detail here.

[0284] The difference between this embodiment and the fifth embodiment is that a pressure relief mechanism 1111 is provided on the side wall where the multiple battery cells 111 in the battery cell group 11 are connected to the support plate 13, and a plurality of through holes 1341 are provided on the support plate 13. The multiple through holes 1341 correspond one-to-one to the pressure relief mechanisms 1111 of the multiple battery cells 111 on the support plate 13, and the cross-sectional dimensions of the through holes 1341 are not less than the cross-sectional dimensions of the corresponding pressure relief mechanisms 1111.

[0285] According to a ninth embodiment of the present application, as shown in FIG. 20 to FIG. 23 , the present application provides a battery 10 , which includes a box 12 , a battery cell group 11 , a support plate 13 and a connecting plate 14 .

[0286] The configuration of the box 12 , the battery cell group 11 and the connecting plate 14 is similar to that of the eighth embodiment and will not be described in detail here.

[0287] The difference between this embodiment and the eighth embodiment is that at least one avoidance groove 1342 is provided on the support plate 13, and one avoidance groove 1342 corresponds to the pressure relief mechanism 1111 of multiple cell units, wherein the depth H of the avoidance groove 1342 is ≥ 2 mm, and the bottom wall thickness h of the avoidance groove 1342 is ≤ 2 mm.

[0288] According to the tenth embodiment of the present application, as shown in FIG. 24 and FIG. 25 , the present application provides a battery 10 , which includes a box 12 , a battery cell group 11 , a support plate 13 and a connecting plate 14 .

[0289] The configuration of the box 12 , the battery cell group 11 and the connecting plate 14 is similar to that of the fifth embodiment and will not be described in detail here.

[0290] The difference between this embodiment and the fifth embodiment is that the plurality of support plates 13 are spaced apart from each other to form avoidance gaps 1343 , and the pressure relief mechanisms 1111 of the plurality of battery cells 111 of the battery cell group 11 correspond to the avoidance gaps 1343 .

[0291] 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.

[0292] 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: A box body having a cavity; A battery cell group is contained in the cavity, wherein the battery cell group includes a plurality of arranged battery cells; A support plate is installed in the cavity, the battery cell group is installed on the support plate so that the support plate supports the plurality of battery cells, and the support plate is insulated from the box.

2. The battery according to claim 1, characterized in that The insulation resistance between the support plate and the box body is R1, which satisfies: R1≥1MΩ.

3. The battery according to claim 1 or 2, characterized in that: The support plate includes a plastic member.

4. The battery according to claim 3, characterized in that The supporting plate is connected to the box body.

5. The battery according to claim 4, characterized in that The support plate includes a first part and a second part which are connected to each other. The battery cell group is installed on the first part. The second part is connected to the box body. The first part is a metal part, and the second part is a plastic part.

6. The battery according to claim 5, characterized in that One of the first part and the second part is provided with a protrusion, and the other is provided with a groove, and the protrusion is embedded in the groove to connect the first part and the second part.

7. The battery according to claim 6, characterized in that The first part includes a main board body and the protrusion protruding from the outer peripheral surface of the main board body toward the second part, the battery cell group is installed on the main board body, the thickness of the protrusion is less than the thickness of the main board body, the second part is arranged around the main board body, and the second part has the groove on a side facing the first part.

8. The battery according to claim 7, characterized in that The support plate is provided with a mounting hole, and the mounting hole is used for a fastener to pass through to connect the support plate and the box body; The mounting hole penetrates the second portion along the thickness direction of the support plate; or, The mounting hole penetrates the protrusion and the second portion along a thickness direction of the support plate.

9. The battery according to claim 1 or 2, characterized in that: The support plate is a metal piece, and is spaced apart from the box. A connecting plate is provided between the side of the support plate away from the battery cell group and the box. The connecting plate is an insulating piece and is connected to the support plate and the box respectively.

10. The battery according to claim 9, characterized in that The supporting plates are provided in plurality, the supporting plates are spaced apart from each other, and each supporting plate supports at least one battery cell group.

11. The battery according to claim 10, characterized in that The battery cell groups are arranged in plurality, and the plurality of battery cell groups are arranged in one-to-one correspondence with the plurality of support plates.

12. The battery according to claim 10 or 11, characterized in that: At least one of the connecting plates has a protrusion, and the protrusion extends into the gap between two adjacent supporting plates.

13. The battery according to any one of claims 10 to 12, characterized in that: The insulation resistance between two adjacent support plates is R2, satisfying: R2≥1KΩ.

14. The battery according to any one of claims 10 to 13, characterized in that: In the same battery cell group mounted on the same support plate, the potential difference between the housings of two adjacent battery cells is U i , satisfying: U i ≤50V.

15. The battery according to claim 14, characterized in that IN i ≤20V.

16. The battery according to any one of claims 10 to 15, characterized in that In the same battery cell group mounted on the same support plate, the maximum potential difference between the housings of two adjacent battery cells is U max , the volume energy density of the battery cell is E, which satisfies: 1.05*10 3 Wh*V / L≤E*U max ≤4*10 4 Wh*V / L.

17. The battery according to claim 16, characterized in that 300Wh / L≤E≤800Wh / L,3.5V≤U max ≤50V。 18. The battery according to claim 16 or 17, characterized in that: 1.05*10 3 Wh*V / L≤E*U max ≤1.6*10 4 Wh*V / L,3.5V≤U max ≤20V。 19. The battery according to any one of claims 10 to 18, characterized in that A flow channel for heat exchange medium to flow is provided in the support plate, and the heat exchange medium is used to adjust the temperature of the battery cell. The flow channels of the plurality of support plates are connected through a connecting portion, and the connecting portion is an insulating member.

20. The battery according to claim 19, characterized in that In two adjacent battery cell groups installed on two adjacent support plates, the maximum potential difference between the shells of two adjacent battery cells belonging to the two adjacent battery cell groups is U1, the resistance of the heat exchange medium in the connecting portion is R3, and the following conditions are satisfied: 0.05V / KΩ≤U1 / R3≤400V / KΩ, wherein R3=ρL / S, ρ is the conductivity of the heat exchange medium, L is the length of the heat exchange medium flowing in the connecting portion, and S is the flow cross-sectional area of ​​the connecting portion.

21. The battery according to claim 20, characterized in that 50V≤U1≤400V, 1KΩ≤R3≤1000KΩ.

22. The battery according to claim 20 or 21, characterized in that 0.05V / KΩ≤U1 / R3≤200V / KΩ.

23. The battery according to any one of claims 1 to 22, characterized in that The side wall of the battery cell provided with the pressure relief mechanism is connected to the support plate, and the support plate has a avoidance structure arranged opposite to the pressure relief mechanism.

24. The battery according to claim 23, characterized in that The avoidance structure corresponds to the pressure relief mechanism one by one; Alternatively, each of the avoidance structures corresponds to a plurality of the pressure relief mechanisms.

25. The battery according to claim 23 or 24, characterized in that The avoidance structure includes a through hole arranged on the support plate.

26. The battery according to any one of claims 23 to 25, characterized in that The avoidance structure comprises an avoidance groove arranged on the support plate, and a notch of the avoidance groove faces the pressure relief mechanism.

27. The battery according to claim 26, characterized in that The depth of the avoidance groove is H, which satisfies: 2mm≤H≤10mm; and / or the bottom wall thickness of the avoidance groove is h, which satisfies: 0.1mm≤h≤2mm.

28. The battery according to any one of claims 23 to 27, characterized in that The supporting plates are arranged in plurality, the supporting plates are spaced apart from each other, and the avoiding structure comprises an avoiding gap between two adjacent supporting plates.

29. An electrical device, characterized in that: include: The battery according to any one of claims 1 to 28, wherein the battery is used to provide electrical energy.

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