Battery and electric device

Abstract

A battery and an electric device, which belong to the technical field of batteries. The battery comprises: a case, which has a cavity; a plurality of battery cell groups, which are accommodated in the cavity, each battery cell group comprising a plurality of arranged battery cells; a plurality of support plates, which are mounted at the cavity and are spaced apart from each other, each support plate being a metal plate, the battery cell groups being mounted onto the support plates so that the support plates support the plurality of battery cells, and each support plate supporting at least one battery cell group; and connecting plates, each of which is arranged between the side of the support plate facing away from the battery cell group and the case, is an insulating member, and is connected to both the support plate and 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: 202311419343.7 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 field of battery technology, and in particular to a battery and an electrical device. Background Art

[0004] Generally, in a battery, when two battery cells experience thermal runaway at the same time, the insulation design between the battery cells and the support plate is damaged. The two battery cells can easily conduct electricity through the support plate, causing a short circuit or even high-voltage breakdown and sparking, posing a 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 two battery cells in the battery can easily lead to short circuit, heating, and even fire, which may cause safety hazards.

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

[0008] A box body having a cavity;

[0009] A plurality of battery cell groups are housed in the cavity, wherein the battery cell groups include a plurality of arranged battery cells;

[0010] a plurality of support plates, the support plates being mounted on the cavity, the plurality of support plates being spaced apart from each other, the battery cell groups being mounted on the support plates so that the support plates support the plurality of battery cells, and each of the support plates supports at least one battery cell group;

[0011] A connecting plate is provided between the box and a side of the support plate facing away from the battery cell group. The connecting plate is an insulating member and is connected to the support plate and the box respectively.

[0012] In the above technical solution, the support plates are spaced apart from each other so that different support plates are relatively insulated. Even if two battery cells located on different support plates thermally run away, the probability of conduction through the support plates is also small, thereby reducing the probability of any two battery cells in the battery thermally run away to form a short circuit loop, reducing the risk of high-voltage breakdown and ignition, and improving the safety performance of the battery. By setting a connecting plate, the production and processing difficulty is low, assembly is easy, and production costs are reduced. Multiple battery cell groups can be insulated from the box, which reduces the probability of double-point insulation failure in the battery and improves safety performance.

[0013] In some embodiments, the support plate is a metal plate, and the support plate is spaced apart from the box body.

[0014] In the above technical solution, by setting the support plate as a metal plate, the thermal conductivity of the support plate is improved. The metal plate can be made into a water-cooling plate that can exchange heat with the battery cell, thereby improving the working efficiency and working stability of the battery cell.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] In some embodiments, the insulation resistance between two adjacent support plates is R2, which satisfies: R2 ≥ 1 KΩ.

[0020] 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.

[0021] 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 U i , satisfying: U i ≤50V.

[0022] In the above technical solution, the maximum value of the potential difference Ui between the shells of two battery cells is set to reduce the probability of ignition and improve the safety of the battery.

[0023] In some embodiments, U i ≤20V.

[0024] In the above technical solution, 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 in the same battery cell group on the same support plate.

[0025] 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: 1.05*10 3 Wh*V / L≤E*U max ≤4*10 4 Wh*V / L.

[0026] 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.

[0027] In some embodiments, 300Wh / L≤E≤800Wh / L, 3.5V≤U max ≤50V.

[0028] 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.

[0029] 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.

[0030] In the above technical solution, by further defining E*U max and U max range to further enhance battery safety.

[0031] 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.

[0032] 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.

[0033] 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:

[0034] 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.

[0035] 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.

[0036] In some embodiments, 50V≤U1≤400V, 1KΩ≤R3≤1000KΩ.

[0037] 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.

[0038] In some embodiments, 0.05V / KΩ≤U1 / R3≤200V / KΩ.

[0039] In the above technical solution, by limiting the value range of U1 / R3, the battery is safer.

[0040] 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.

[0041] 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.

[0042] In some embodiments, the avoidance structure corresponds one-to-one with the pressure relief mechanism;

[0043] Alternatively, each of the avoidance structures corresponds to a plurality of the pressure relief mechanisms.

[0044] In some embodiments, the avoidance structure includes a through hole provided in the support plate.

[0045] In the above technical solution, the through hole is provided to effectively avoid the action of the pressure relief mechanism, thereby ensuring safety.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] In some embodiments, the avoidance structure includes a avoidance gap between two adjacent support plates.

[0051] 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.

[0052] In a second aspect, an embodiment of the present application provides an electrical device, including:

[0053] The battery as described in any of the above embodiments is used to provide electrical energy.

[0054] In the above technical solution, by using the battery as described in the above embodiment, the risk of short circuit loops formed due to thermal runaway of multiple battery cells can be reduced, the risk of high-voltage breakdown and ignition can be reduced, the safety of the battery can be improved, and the safety and stability of the electrical device can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] 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.

[0056] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0057] FIG2 is one of the structural exploded views of a battery provided in some embodiments of the present application;

[0058] FIG3 is a schematic diagram of a cross-sectional structure of a battery provided in some embodiments of the present application;

[0059] Figure 4 is an enlarged view of point C in Figure 3;

[0060] FIG5 is a second schematic diagram of a cross-sectional structure of a battery provided in some embodiments of the present application;

[0061] Figure 6 is an enlarged view of point D in Figure 5;

[0062] FIG7 is a second exploded view of the structure of a battery provided in some embodiments of the present application;

[0063] FIG8 is a third schematic diagram of a cross-sectional structure of a battery provided in some embodiments of the present application;

[0064] FIG9 is a third exploded view of the structure of a battery provided in some embodiments of the present application;

[0065] FIG10 is one of the exploded views of a partial structure of a battery provided in some embodiments of the present application;

[0066] FIG11 is a second exploded view of a partial structure of a battery provided in some embodiments of the present application;

[0067] FIG12 is a third exploded view of a partial structure of a battery provided in some embodiments of the present application;

[0068] FIG13 is a schematic diagram of a partial cross-sectional structure of a battery provided in some embodiments of the present application;

[0069] Figure 14 is an enlarged view of point E in Figure 13;

[0070] FIG15 is a fourth exploded view of a partial structure of a battery provided in some embodiments of the present application;

[0071] FIG16 is a fifth exploded view of a local structure of a battery provided in some embodiments of the present application.

[0072] 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, flow channel 133, avoidance structure 134, through hole 1341, avoidance groove 1342, avoidance gap 1343; connecting plate 14, protrusion 141; connecting portion 15. DETAILED DESCRIPTION

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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).

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] In typical batteries, multiple battery cells are typically stacked in an arrangement within a battery housing to ensure sufficient power. However, during use, battery cells may experience thermal runaway due to various factors, such as squeezing, collision, and aging. After thermal runaway, the insulating film between the battery cell and the support plate can easily melt and fail, causing the insulation design between the battery cell and the support plate to fail. If two battery cells experience thermal runaway, the two battery cells will connect through the support plate, forming a short circuit. This can cause a short circuit in the battery or even a high-voltage breakdown and ignition, posing a potential safety hazard.

[0085] Based on the above considerations, in order to solve the problem that thermal runaway of two battery cells in the battery can easily lead to short circuit, heating and even fire, which may cause safety hazards, the present application designs a battery, including a box, multiple support plates and multiple battery cell groups, the box has a cavity, the multiple battery cell groups are accommodated in the cavity, the battery cell group includes multiple arranged battery cells, multiple support plates are installed in the cavity, the multiple support plates are spaced apart from each other, the battery cell group is installed on the support plate so that the support plate supports multiple battery cells, and each support plate supports at least one battery cell group.

[0086] In a battery with this structure, multiple support plates are spaced apart so that different support plates are relatively insulated. Even if two battery cells on different support plates experience thermal runaway, the probability of conduction through the support plates is low, thereby reducing the risk of short circuits caused by thermal runaway of multiple battery cells and improving the safety performance of the battery.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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 FIG2 , the battery cell 111 is in the shape of a rectangular parallelepiped.

[0095] According to some embodiments of the present application, as shown in Figures 2 to 16 , with particular reference to Figure 2 , an embodiment of the present application provides a battery 10 , which may include a box 12 , multiple battery cell groups 11 , multiple support plates 13 and a connecting plate 14 .

[0096] The box body 12 may have a cavity 124, and multiple battery cell groups 11 may be accommodated in the cavity 124. The battery cell group 11 may include multiple arranged battery cells 111. Multiple support plates 13 may be installed in the cavity 124. The multiple support plates 13 are spaced apart from each other. The support plates 13 may be metal plates. The battery cell group 11 may be installed on the support plates 13 so that the support plates 13 support multiple battery cells 111, and each support plate 13 supports at least one battery cell group.

[0097] 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.

[0098] Multiple support plates 13 are 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 multiple battery cells 111 are connected to the box body 12 through the support plate 13, wherein the support plate 13 can be made of metal or plastic material.

[0099] 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.

[0100] The support plates 13 are spaced apart from each other and can be relatively insulated so that when the battery cells 111 located on different support plates 13 thermally run away, the probability of conduction through the support plates 13 is reduced, and the risk of two battery cells 111 thermally run away at the same time, resulting in a short circuit or high-voltage breakdown and ignition, is reduced, thereby improving the safety of the battery 10.

[0101] As shown in Figures 2 to 16, please refer to Figures 2 and 3 for details, the battery 10 may further include a connecting plate 14, which may be disposed 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 may be an insulating member and may be connected to the support plate 13 and the box body 12, respectively.

[0102] The support plate 13 can be spaced apart from the box body 12 in the thickness direction, 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 two sides of the connecting plate 14 are respectively connected to the support plate 13 and the box body 12, so that the support plate 13 is installed on the box body 12 through the connecting plate 14. Specifically, the connecting plate 14 can be fixedly connected to the support plate 13 by bonding, and the connecting plate 14 can be fixedly connected to the box body 12 by gluing, so that the support plate 13 and the box body 12 are relatively fixed.

[0103] 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.

[0104] In actual implementation, multiple support plates 13 are first installed in the cavity at intervals, and then multiple battery cell groups 11 are installed on the multiple support plates 13, wherein each support plate 13 can support at least one battery cell group 11. It can be understood that multiple battery cell groups 11 can also be installed on one support plate 13, and the specific number is not limited here. Since the support plates 13 are spaced apart from each other so that different support plates 13 are relatively insulated, even if two battery cells 111 located on different support plates 13 have thermal runaway, the probability of conduction through the support plate 13 is relatively small.

[0105] According to the battery 10 provided in the embodiment of the present application, the support plates 13 are spaced apart from each other so that different support plates 13 are relatively insulated. Even if two battery cells 111 located on different support plates 13 experience thermal runaway, the probability of conduction through the support plates 13 is relatively low, thereby reducing the probability of any two battery cells 111 in the battery 10 experiencing thermal runaway and forming a short circuit loop, reducing the risk of high-voltage breakdown and ignition, and improving the safety performance of the battery 10. By providing the connecting plate 14, the production and processing difficulty is low, assembly is easy, and production costs are reduced. In addition, the multiple battery cell groups 11 can be insulated from the box, thereby reducing the probability of double-point insulation failure in the battery 10 and improving safety performance.

[0106] According to some embodiments of the present application, the support plate 13 may be a metal plate, and the support plate 13 may be spaced apart from the box body 12 .

[0107] In this embodiment, the support plate 13 may be a metal plate. Metal plates have good thermal conductivity, allowing the support plate 13 to be configured as a water-cooled plate to control the temperature of the multiple battery cells 111. Specifically, a flow channel may be provided within the support plate 13. By circulating a heat exchange medium within the flow channel, the temperature of the battery cell group 11 is regulated, thereby improving the operating efficiency and stability of the battery 10. Furthermore, the support plate 13 may be spaced apart from the housing 12 to provide insulation between the support plate 13 and the housing 12. This reduces the probability of the battery cells 111 conducting electrical conduction through the support plate 13 and into the housing 12 in the event of thermal runaway, thereby mitigating safety risks.

[0108] According to the battery 10 provided in the embodiment of the present application, the thermal conductivity of the support plate is improved by setting the support plate as a metal plate. The metal plate can be made into a water-cooling plate that can exchange heat with the battery cell, thereby improving the working efficiency and working stability of the battery cell.

[0109] In some embodiments, the insulation resistance between the support plate 13 and the box body 12 is R1, which may satisfy: R1 ≥ 1 MΩ. Optionally, 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 here.

[0110] 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.

[0111] 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 .

[0112] 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.

[0113] According to some embodiments of the present application, as shown in FIG. 5 and FIG. 6 , at least one connecting plate 14 has a protrusion 141 , and the protrusion 141 extends into the gap between two adjacent support plates 13 .

[0114] 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.

[0115] 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 .

[0116] 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 is made more stable, thereby improving the safety performance of the battery 10 .

[0117] 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.

[0118] 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.

[0119] The minimum value of the insulation resistance R2 between two adjacent support plates 13 is 1KΩ, and R2 can be 1KΩ, 10KΩ, 100KΩ, 1000KΩ, 2000KΩ, 10000KΩ or other resistance values ​​greater than 1KΩ, which is not specifically limited here.

[0120] 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 .

[0121] 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.

[0122] 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.

[0123] By defining the potential difference U between the housings of the two battery cells 111 i to reduce the probability of ignition and improve the safety of the battery 10.

[0124] The potential difference between the housings of two adjacent battery cells 111 is U i It can be 50V, 45V, 40V, 30V, 20V, 10V or other values ​​less than 50V, and is not specifically limited here.

[0125] According to some embodiments of the present application, U i ≤20V.

[0126] In this embodiment, by further defining the potential difference U between the shells of two adjacent battery cells 111 in the same battery cell group 11 on the same support plate 13, i range to further reduce the risk of ignition.

[0127] 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.

[0128] 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.

[0129] 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. maxThe 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.

[0130] Refer to Table 1, which shows the performance of two adjacent battery cells 111 after thermal runaway occurs under conditions of different volume energy densities and different maximum potential differences of the battery cells 111.

[0131] 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.

[0132] Table 1

[0133] 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.

[0134] Among them, E*U max The value range is [1050Wh*V / L, 40000Wh*V / L]. Specifically, 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, 32000Wh*V / L, 40000Wh*V / L or other values ​​between 1050Wh*V / L and 40000Wh*V / L.

[0135] According to the embodiment of the present application, the maximum and minimum values ​​of E*Umax are limited to reduce the probability of ignition when the two battery cells 111 are in thermal runaway, while ensuring that the battery 10 has a high cost-effectiveness.

[0136] 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 Umax The volume energy density of the battery cell 111 may be E, which may satisfy: 300Wh / L≤E≤800Wh / L, 3.5V≤U max ≤50V.

[0137] 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.

[0138] According to the test data in Table 1, when 300Wh / L≤E≤800Wh / L and 3.5V≤Umax≤50V, the battery 10 has a high cost-performance ratio and is not likely to cause ignition.

[0139] Among them, the volume energy density E of the battery cell 111 has a value range of [300Wh / L, 800Wh / L]. Specifically, E can be 300Wh / L, 400Wh / L, 500Wh / L, 600Wh / L, 700Wh / L, 800Wh / L or other values ​​between 300Wh / L-800Wh / L, and is not specifically limited here.

[0140] 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 is [3.5V, 50V]. Specifically, U max The value can be 3.5V, 10V, 15V, 20V, 50V or other values ​​between 3.5V and 50V, which are not specifically limited here.

[0141] 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.

[0142] According to some embodiments of the present application, 1.05*10 3 Wh*V / L≤E*U max ≤1.6*10 4 Wh*V / L, 3.5V≤Umax≤20V.

[0143] In this embodiment, E*U maxThe value range of E*U is [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 improves safety. Specifically, 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.

[0144] In this embodiment, U max The value range of U is [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 ignition is lower, which is safer. Specifically, 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.

[0145] 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.

[0146] According to some embodiments of the present application, as shown in Figures 7 and 8, 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.

[0147] 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.

[0148] 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.

[0149] In actual implementation, referring to Figures 7 and 8 , 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 enters the second of the two support plates 13 after circulating through the first, and flows out through the outlet of the second to circulate back 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.

[0150] 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.

[0151] 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:

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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 .

[0156] 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.

[0157] Table 2

[0158] 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.

[0159] Moreover, considering the actual production and processing costs, U1 / R3 has a minimum value, which is 0.05V / KΩ.

[0160] Among them, the value range of U1 / R3 is [0.05V / KΩ, 400V / KΩ]. Specifically, 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, and is not specifically limited here.

[0161] 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.

[0162] According to some embodiments of the present application, 50V≤U1≤400V, 1KΩ≤R3≤1000KΩ.

[0163] 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.

[0164] 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.

[0165] Among them, the value range of U1 is [50V, 400V]. Specifically, U1 can be 50V, 100V, 150V, 200V, 250V, 300V, 400V or other values ​​between 50V-400V, and is not specifically limited here.

[0166] Among them, the value range of R3 is [1KΩ, 1000KΩ]. Specifically, R3 can be 1KΩ, 10KΩ, 100KΩ, 300KΩ, 500KΩ, 800KΩ, 1000KΩ or other values ​​between 1KΩ-1000KΩ, and is not specifically limited here.

[0167] 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.

[0168] According to some embodiments of the present application, 0.05V / KΩ≤U1 / R3≤200V / KΩ.

[0169] In this embodiment, the value range of U1 / R3 is [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, safety is higher when U1 / R3 ≤ 200V / KΩ.

[0170] Specifically, 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 and 200V / KΩ, which are not specifically limited here.

[0171] According to the value range of U1 / R3 in the embodiment of the present application, the battery 10 is safer.

[0172] According to some embodiments of the present application, as shown in Figures 9 to 16, 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.

[0173] 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.

[0174] 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.

[0175] 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 .

[0176] 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 .

[0177] In one example, as shown in Figures 9 and 10, 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 a avoidance role for each pressure relief mechanism 1111, reduce the mutual influence between the pressure relief mechanisms 1111, and improve stability.

[0178] In another example, as shown in Figures 11 to 16, 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.

[0179] According to some embodiments of the present application, as shown in FIG. 9 and FIG. 10 , the avoidance structure 134 may include a through hole 1341 provided in the support plate 13 .

[0180] 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.

[0181] According to some embodiments of the present application, as shown in FIG. 11 to FIG. 14 , the avoidance structure 134 may include a avoidance groove 1342 provided on the support plate 13 , and the notch of the avoidance groove 1342 may face the pressure relief mechanism 1111 .

[0182] In this embodiment, the avoidance structure 134 may include a 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.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] In this embodiment, the depth H of the avoidance groove 1342 has a value range of [2mm-10mm]. Specifically, 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]. Specifically, 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.

[0187] 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.

[0188] According to some embodiments of the present application, as shown in FIG. 15 and FIG. 16 , the avoidance structure 134 may include an avoidance gap 1343 between two adjacent support plates.

[0189] In this embodiment, a plurality of support plates 13 are provided so that 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. The avoidance structure 134 may include the avoidance gap 1343 between two adjacent support plates. 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.

[0190] 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.

[0191] The power-consuming device may be any of the aforementioned devices or systems using the battery 10 .

[0192] According to a first embodiment of the present application, as shown in FIG. 2 to FIG. 4 , the present application provides a battery 10 , which includes a housing 12 , a plurality of battery cell groups 11 , a plurality of support plates 13 , and a plurality of connection plates 14 .

[0193] 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.

[0194] A plurality of battery cell groups 11 are housed in the cavity 124 . The battery cell group 11 includes a plurality of battery cells 111 arranged in an array.

[0195] Multiple support plates 13 are installed in the cavity 124. The multiple battery cell groups 11 correspond to the multiple support plates 13 one by one. The support plates 13 are spaced apart from each other and from the box 12. The support plates 13 are metal plates. The battery cell groups 11 are installed on the support plates 13 and support the multiple battery cells 111 through the support plates 13.

[0196] The connecting plate 14 is disposed between the side of the support plate 13 facing away from the battery cell group 11 and the box body. The connecting plate 14 is an insulating member to insulate the support plate 13 from the box body 12, so that the multiple battery cells 111 are relatively insulated from the box body 12, and the insulation resistance R1 between the support plate 13 and the box body 12 is ≥1MΩ, and the support plates 13 are insulated from each other.

[0197] The insulation resistance R2 between two adjacent support plates 13 is ≥1KΩ. In the same battery cell group 11 mounted on the same support plate 13, the potential difference between the shells of two adjacent battery cells 111 is Ui≤50V. In the embodiment, U i ≤20V.

[0198] 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 ≤4*10 4Wh*V / L, 300Wh / L≤E≤800Wh / L, 3.5V≤U max ≤50V. In the embodiment, 1.05*10 3 Wh*V / L≤E*U max ≤1.6*10 4 Wh*V / L, 3.5V≤U max ≤20V.

[0199] According to a second embodiment of the present application, as shown in FIG. 5 and FIG. 6 , 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 .

[0200] The configuration of the box 12 , the battery cell group 11 and the support plate 13 is similar to that of the first embodiment and will not be described in detail here.

[0201] The difference between this embodiment and the first 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 .

[0202] 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 , a support plate 13 and a connecting plate 14 .

[0203] The configuration of the box 12 , the battery cell group 11 and the connecting plate 14 is similar to that of the first embodiment and will not be described in detail here.

[0204] This embodiment differs from the first 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.

[0205] 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 this embodiment, 0.05V / KΩ≤U1 / R3≤200V / KΩ.

[0206] 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 , a support plate 13 and a connecting plate 14 .

[0207] The configuration of the box 12 , the battery cell group 11 and the connecting plate 14 is similar to that of the first embodiment and will not be described in detail here.

[0208] The difference between this embodiment and the first 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.

[0209] According to a fifth embodiment of the present application, as shown in FIG. 11 to FIG. 14 , 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 .

[0210] 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.

[0211] The difference between this embodiment and the fourth embodiment is that at least one avoidance groove 1342 is provided on the support plate 13 instead of the multiple through holes 1341, 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 satisfies: 2mm≤H≤10mm, and the bottom wall thickness h of the avoidance groove 1342 satisfies: 0.1mm≤h≤2mm.

[0212] According to a sixth embodiment of the present application, as shown in FIG. 15 and FIG. 16 , 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 .

[0213] The configuration of the box 12 , the battery cell group 11 and the connecting plate 14 is similar to that of the first embodiment and will not be described in detail here.

[0214] The difference between this embodiment and the first 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 .

[0215] 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.

[0216] The above are merely examples of the present application and are not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. 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 plurality of battery cell groups are accommodated in the cavity, wherein the battery cell groups include a plurality of arranged battery cells; A plurality of support plates, the support plates are mounted on the cavity, the plurality of support plates are spaced apart from each other, the battery cell groups are mounted on the support plates so that the support plates support a plurality of the battery cells, and each of the support plates supports at least one of the battery cell groups; A connecting plate is disposed between a side of the support plate away from the battery cell group and the box body. The connecting plate is an insulating member and is connected to the support plate and the box body respectively.

2. The battery according to claim 1, characterized in that The support plate is a metal plate, and the support plate is spaced apart from the box body.

3. The battery according to claim 1, characterized in that The plurality of battery cell groups are arranged in one-to-one correspondence with the plurality of support plates.

4. The battery according to claim 1, 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.

5. The battery according to any one of claims 1 to 4, characterized in that The insulation resistance between two adjacent support plates is R2, satisfying: R2≥1KΩ.

6. The battery according to any one of claims 1 to 4, 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.

7. The battery according to claim 6, characterized in that IN i ≤20V.

8. The battery according to any one of claims 1 to 4, 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.

9. The battery according to claim 8, characterized in that 300Wh / L≤E≤800Wh / L,3.5V≤U max ≤50V。 10. The battery according to claim 8, 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。 11. The battery according to any one of claims 1 to 4, 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.

12. The battery according to claim 11, 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.

13. The battery according to claim 12, characterized in that 50V≤U1≤400V, 1KΩ≤R3≤1000KΩ.

14. The battery according to claim 12, characterized in that 0.05V / KΩ≤U1 / R3≤200V / KΩ.

15. The battery according to claim 1 or 2, 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.

16. The battery according to claim 15, 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.

17. The battery according to claim 15, characterized in that The avoidance structure includes a through hole arranged on the support plate.

18. The battery according to claim 15, 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.

19. The battery according to claim 18, 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.

20. The battery according to claim 15, characterized in that The avoidance structure includes a avoidance gap between two adjacent support plates.

21. An electrical device, characterized in that: include: The battery according to any one of claims 1 to 20, wherein the battery is used to provide electrical energy.

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