Battery and power consuming device

Abstract

The embodiment of the application provides a battery and a power utilization device, and belongs to the technical field of batteries. The battery comprises a box body with a cavity; a battery monomer group accommodated in the cavity, the battery monomer group comprising a plurality of arranged battery monomers; and a plurality of support plates, the plurality of support plates being spaced apart from each other and installed in the cavity, each support plate supporting at least one battery monomer group, the bottom surface of the battery monomer without an electrode terminal being supported on the support plate, the support plate being spaced apart from the box body, a connecting plate being arranged between the side, away from the battery monomer group, of the support plate and the box body, the connecting plate being an insulating piece and being connected with the support plate and the box body respectively, a flow channel for the flow of a heat exchange medium being arranged in the support plate, the heat exchange medium being used for adjusting the temperature of the battery monomer, the flow channels of the plurality of support plates being communicated through a connecting part, and the connecting part being an insulating piece. According to the battery provided by the embodiment of the application, the probability of short circuit and high-voltage breakdown of the battery, and double-point insulation failure when the battery monomer is in thermal runaway, can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery and an electrical device. Background Art

[0002] Typically, batteries are designed with equal potential between the casing and the liquid-cooled support plate of the battery pack. When a 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 them and the casing. This results in double-point insulation failure, posing a safety hazard. Summary of the Invention

[0003] 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.

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

[0005] A box body having a cavity;

[0006] a battery cell group housed in the cavity, the battery cell group comprising a plurality of arranged battery cells;

[0007] A plurality of support plates, wherein the plurality of support plates are spaced apart from each other and installed in the cavity, each support plate supports at least one of the battery cell groups, the bottom surface of the battery cell without an electrode terminal is supported on the support plate, the support plate is spaced apart from the box body, a connecting plate is provided between the side of the support plate facing away from the battery cell group and the box body, the connecting plate is an insulating member and is respectively connected to the support plate and the box body, a flow channel for circulating a heat exchange medium is provided in the support plate, 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.

[0008] In the above technical solution, by arranging a combination of multiple support plates and connecting plates, the probability of short circuit and high-voltage breakdown of the battery can be reduced, as well as the probability of double-point insulation failure during thermal runaway of the battery cell can be reduced, thereby improving the safety of the battery. The entire battery production and processing is easy to assemble and has low production costs. While ensuring the insulation design, the flow channels of each support plate are connected, which facilitates the thermal management design of the battery cell.

[0009] In some embodiments, the insulation resistance between the support plate and the box is R1, which satisfies: R1 ≥ 1 MΩ.

[0010] In the technical scheme, the insulation requirement between the battery monomer and the box is met, the insulation effect is better, the breakdown probability is reduced, and the safety of the battery is ensured.

[0011] In some embodiments, the support plate is a metal piece.

[0012] In the technical scheme, the heat management capability of the battery monomer can be improved while ensuring the insulation design.

[0013] In some embodiments, the battery monomer groups are arranged in a one-to-one correspondence with the plurality of support plates.

[0014] In the technical scheme, the arrangement and assembly of the battery monomer groups and the support plates are facilitated, and the arrangement density of the plurality of battery monomers on the support plate is improved, facilitating management.

[0015] In some embodiments, in the two adjacent battery monomer groups mounted on the two adjacent support plates, the maximum potential difference between the housings of the two adjacent battery monomers belonging to the two adjacent battery monomer groups is U1, and the resistance of the heat exchange medium in the connecting portion is R3, which satisfies:

[0016] 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.

[0017] In the technical scheme, by limiting the range of U1 / R3, the safety performance in the case of arranging the connecting portion is ensured, and the production cost is controlled.

[0018] In some embodiments, 50V≤U1≤400V, 1KΩ≤R3≤1000KΩ.

[0019] In the technical scheme, by limiting the value range of U1 and R3, the safety performance of the battery is improved, and the production and design cost of the battery is controlled.

[0020] In some embodiments, 0.05V / KΩ≤U1 / R3≤200V / KΩ.

[0021] In the technical scheme, by limiting the preferred value range of U1 / R3, the safety of the battery is higher.

[0022] In some embodiments, the side wall of the pressure relief mechanism of the battery monomer is connected with the support plate, and the support plate has an avoidance structure arranged opposite to the pressure relief mechanism.

[0023] 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.

[0024] In some embodiments, the avoidance structure corresponds one-to-one with the pressure relief mechanism;

[0025] Alternatively, each of the avoidance structures corresponds to a plurality of the pressure relief mechanisms.

[0026] In some embodiments, the avoidance structure includes a through hole provided in the support plate.

[0027] In the above technical solution, the through hole is provided to effectively avoid the action of the pressure relief mechanism, thereby ensuring safety.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] In a second aspect, an embodiment of the present application provides an electrical device, including:

[0035] The battery as described in any of the above embodiments is used to provide electrical energy.

[0036] 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

[0037] 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.

[0038] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0039] Figure 2 A fifth exploded diagram of the structure of a battery provided in some embodiments of the present application;

[0040] Figure 3 FIG7 is a schematic diagram of a cross-sectional structure of a battery provided in some embodiments of the present application;

[0041] Figure 4 A sixth exploded diagram of the structure of a battery provided in some embodiments of the present application;

[0042] Figure 5 One of the exploded views of the local structure of a battery provided in some embodiments of the present application;

[0043] Figure 6 The second exploded view of the local structure of the battery provided in some embodiments of the present application;

[0044] Figure 7 The third exploded view of the local structure of the battery provided in some embodiments of the present application;

[0045] Figure 8 This is one of the schematic diagrams of a partial cross-sectional structure of a battery provided in some embodiments of the present application;

[0046] Figure 9 for Figure 8 Enlarged view of point E in the middle;

[0047] Figure 10 A fourth exploded view of a local structure of a battery provided in some embodiments of the present application;

[0048] Figure 11 This is a fifth exploded diagram of the local structure of a battery provided in some embodiments of the present application.

[0049] Reference numerals:

[0050] Vehicle 1, battery 10, motor 20, controller 30;

[0051] Battery cell group 11, battery cell 111, pressure relief mechanism 1111;

[0052] Box body 12, bottom plate 121, top cover 122, frame 123, cavity 124;

[0053] Support plate 13, flow channel 133, avoidance structure 134, through hole 1341, avoidance groove 1342, avoidance gap 1343;

[0054] Connecting plate 14;

[0055] Connecting portion 15. DETAILED DESCRIPTION

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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).

[0062] 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.

[0063] 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.

[0064] The battery cell comprises a shell, an electrode assembly and an electrolyte, the shell being used for containing the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode tab, a negative electrode tab and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. The positive electrode tab comprises a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer being coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protruding from the positive electrode current collector with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer serving as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode tab comprises a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protruding from the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serving as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that no fuse occurs when passing a large current, the number of positive electrode tabs is multiple and they are stacked together, and the number of negative electrode tabs is multiple and they are stacked together. An electrode terminal is arranged on the shell, the electrode terminal is electrically connected with the tabs, the electrode terminal can be directly connected with the tabs or indirectly connected with the tabs through a transfer component; the electrode terminal can comprise a positive electrode terminal and a negative electrode terminal, the positive electrode terminal and the negative electrode terminal being electrically connected with the positive electrode tabs and the negative electrode tabs respectively.

[0065] The material of the separator can be PP (polypropylene) or PE (polyethylene) or the like. In addition, the electrode assembly can be a winding type structure or a laminated type structure, and the embodiments of the present application are not limited thereto.

[0066] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role. The battery is composed of a box body and a plurality of battery cells contained in the box body. Among them, the battery as a core part of new energy vehicles has higher requirements in terms of safety and cycle life.

[0067] In general batteries, the box body and the support plate of the battery cell group are designed to be at the same potential. When one battery cell loses control, the insulation design between the battery cell and the support plate is damaged, causing the support plate, the box body and the battery cell to be designed at the same potential. Due to high-temperature smoke, the insulation design of the high-voltage components of the remaining battery cells is damaged, causing sparking with the box body, double-point insulation failure, and safety hazards.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] like Figure 1 As shown, 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.

[0073] 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.

[0074] like Figure 2The figure shows an exploded view of the structure of the battery 10 according to 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 a variety of shapes, such as a cylinder, a cuboid, etc.

[0075] 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.

[0076] Please refer 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 respectively the length direction and the width direction of the housing 12, and the first direction X and the second direction Y are perpendicular to each other.

[0077] Each battery cell 111 can be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 111 can be cylindrical, flat, rectangular, or in other shapes.

[0078] According to some embodiments of the present application, Figure 2-Figure 11 As shown, please refer 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 .

[0079] 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.

[0080] 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.

[0081] The support plate 13 is installed in the cavity 124, and the battery cell group 11 is installed on the support plate 13, so that the support plate 13 supports multiple battery cells 111. 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 body 12 through the support plate 13. The bottom surface of the battery cell 111 without the electrode terminal is supported on the support plate 13. For example, the bottom surface of the battery cell 111 without the electrode terminal can be the bottom surface opposite to the electrode terminal.

[0082] The support plate 13 is relatively insulated from the box body 12, and the electrode terminals of the battery cells 111 need to be separated from the top cover 122 of the box body 12 because they can conduct electricity, so that the battery cell group 11 and the box body 12 are relatively insulated. Even if the battery cells 111 in the battery cell group 11 suffer from thermal runaway, causing the insulating layer on the bottom surface of the battery cell 111 where no electrode terminals are provided to fail, the insulating arrangement between the battery cell 111 and the box body 12 is not easily destroyed, which can reduce the probability of double-point insulation failure and improve safety.

[0083] 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. The bottom surfaces of multiple battery cells 111 without electrode terminals are fixed to 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.

[0084] 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 .

[0085] 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. 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.

[0086] 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.

[0087] According to some embodiments of the present application, Figure 2-Figure 11 For details, please refer to Figure 2 The support plate 13 may be a metal part, and the support plate 13 may be spaced apart from the box body 12. A connecting plate 14 may 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 may be an insulating part and is connected to the support plate 13 and the box body 12 respectively.

[0088] 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 .

[0089] 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 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.

[0090] 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.

[0091] 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.

[0092] According to some embodiments of the present application, Figure 2-Figure 11As shown, specific reference Figure 2-Figure 7 The support plates 13 may be provided in plurality, and the plurality of support plates 13 may be spaced apart from each other. Each support plate 13 may support at least one battery cell group 11 .

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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 .

[0098] 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 .

[0099] 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.

[0100] According to some embodiments of the present application, Figure 2 and Figure 3 As shown, a flow channel 133 for heat exchange medium to circulate may be provided in the support plate 13 . The heat exchange medium is used to adjust 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.

[0101] 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.

[0102] 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.

[0103] In actual implementation, refer to Figure 2 and Figure 3 Taking two support plates 13 as an example, each support plate 13 has an inlet and an outlet. The inlet of the first of the two support plates 13 is connected 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. After circulating through the first of the two support plates 13, the heat exchange medium enters the second 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.

[0104] 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.

[0105] 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:

[0106] 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.

[0107] It should be noted that although the connection part 15 is provided as an insulating part with a high insulation resistance, the heat exchange medium flowing in the connection part 15 is generally of an electrically conductive material. If thermal runaway occurs in one battery cell 111 on each of the two adjacent support plates 13 after the flow channels 133 of the two adjacent support plates 13 are connected through the connection part 15, the voltage between the two battery cells 111 can break the heat exchange medium to cause sparking, or form an electrolytic cell structure through the heat exchange medium to cause an electrolytic reaction to heat the connection position of the support plate 13 and the connection part 15, which can cause the connection part 15 to soften or even cause the heat exchange medium to leak, thereby causing a safety hazard.

[0108] In the present embodiment, in the two adjacent battery cell groups 11 installed on the two adjacent support plates 13, the maximum potential difference U1 between the housings of the 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 connection 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 connection part 15 is low, the probability of breakdown through the heat exchange medium is high.

[0109] It can be understood that the resistance of the heat exchange medium depends on the electrical conductivity of the heat exchange medium, the length of the connection part 15, and the flow cross-sectional area of the connection part 15.

[0110] In the present embodiment, the results after thermal runaway of the two adjacent battery cell groups 11 installed on the two adjacent support plates 13 in different U1 / R3 conditions are tested to obtain a reasonable range of U1 / R3. Referring to Table 2, the performance after thermal runaway of the two adjacent battery cell groups 11 installed on the two adjacent support plates 13 in different U1 / R3 conditions is shown.

[0111] Table 1

[0112] U1(V) R3(KΩ) U1 / R3(V / KΩ) result Example 1 50 1000 0.05 normal Example 2 50 100 0.5 normal Example 3 50 1 50 normal Example 4 200 1000 0.2 normal Example 5 200 100 2 normal Example 6 200 1 200 A small amount of temperature rise at the connection Example 7 400 1000 0.4 normal Example 8 400 100 4 normal Example 9 400 1 400 The temperature rise of the connection is significant Comparative Example 1 400 0.8 500 Lighting Comparative Example 2 400 0.6 666.6667 Lighting Comparative Example 3 400 0.2 2000 Lighting

[0113] According to Table 1, in Comparative Examples 1-3, when U1 / R3 is greater than 400 V / KΩ, thermal runaway of the two adjacent battery cell groups 11 installed on the two adjacent support plates 13 can cause sparking, which can easily cause a safety hazard. In Example 9, when U1 / R3 is equal to 400 V / KΩ, the connection part 15 is significantly heated, but no sparking occurs, which is the maximum critical point. When U1 / R3 is less than or equal to 400 V / KΩ, no sparking occurs, which is relatively safe.

[0114] Moreover, considering the actual production and processing costs, U1 / R3 has a minimum value, which is 0.05V / KΩ.

[0115] 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.

[0116] 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.

[0117] According to some embodiments of the present application, 50V≤U1≤400V, 1KΩ≤R3≤1000KΩ.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] According to some embodiments of the present application, 0.05V / KΩ≤U1 / R3≤200V / KΩ.

[0124] In this embodiment, the preferred 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 experiences a small temperature rise. Therefore, when U1 / R3 ≤ 200V / KΩ, safety is higher.

[0125] 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.

[0126] According to the preferred value range of U1 / R3 in the embodiment of the present application, the battery 10 is safer.

[0127] According to some embodiments of the present application, Figure 4-11 As shown, the side wall of the battery cell 111 provided with the pressure relief mechanism 1111 may be connected to the support plate 13 , and the support plate 13 may have an avoidance structure 134 arranged opposite to the pressure relief mechanism 1111 .

[0128] 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.

[0129] 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.

[0130] 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 .

[0131] 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 .

[0132] In one example, if Figure 4 and Figure 5 As shown, a plurality of avoidance structures 134 can be provided 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.

[0133] In another example, Figures 6-11 As shown, when the pressure relief mechanisms 1111 of multiple battery cells 111 are arranged neatly, one or more avoidance structures 134 can be set 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 multiple pressure relief mechanisms 1111, and the support plate 13 is easy to process.

[0134] According to some embodiments of the present application, Figure 4 and Figure 5 As shown, the avoidance structure 134 may include a through hole 1341 provided on the support plate 13 .

[0135] 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.

[0136] According to some embodiments of the present application, Figure 6-Figure 9 As shown, 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 .

[0137] In this embodiment, the avoiding structure can include an avoiding groove 1342 arranged on the support plate 13, and the opening of the avoiding groove 1342 is arranged towards the pressure relief mechanism 1111, so that the pressure relief mechanism 1111 can act into the avoiding groove 1342 when the pressure relief mechanism 1111 is opened, thereby playing a role of avoiding the pressure relief mechanism 1111. The avoiding groove 1342 can extend along the arrangement direction of the battery monomer 111, and one or more avoiding grooves 1342 can be arranged along the arrangement direction of the battery monomer 111, so that one avoiding groove 1342 can correspond to multiple pressure relief mechanisms 1111, and the processing difficulty is low.

[0138] According to some embodiments of the present application, the depth of the avoiding groove 1342 is H, which can satisfy 2mm≤H≤10mm; and / or, the thickness of the bottom wall of the avoiding groove 1342 is h, which can satisfy 0.1mm≤h≤2mm.

[0139] When the pressure relief mechanism 1111 is opened, a certain activity space is required. By limiting the minimum value of the depth H of the avoiding groove 1342, the pressure relief mechanism 1111 has sufficient activity space. In the case of thermal runaway of the battery monomer 111, the pressure relief mechanism 1111 is opened to discharge high-temperature and high-pressure gas outward, and the high-temperature and high-pressure gas can break through the bottom wall of the avoiding groove 1342 to discharge the avoiding groove 1342. By limiting the maximum value of the thickness h of the bottom wall of the avoiding groove 1342, the discharged gas can more easily break through the bottom wall of the avoiding groove 1342 and be smoothly discharged into the box body 12.

[0140] It can be understood that, according to the processing technology and actual production requirements, if the depth H of the avoiding groove 1342 is too large, more space is occupied, and the space utilization rate is reduced; similarly, if the thickness h of the bottom wall of the avoiding groove 1342 is too small, the processing technology requirement is high, and the production cost is increased.

[0141] In this embodiment, the depth H of the avoiding groove 1342 is in the range of [2mm-10mm], specifically, the depth H of the avoiding groove 1342 can be 2mm, 4mm, 6mm, 8mm, 10mm or other values between 2mm and 10mm, which is not limited herein; the thickness h of the bottom wall of the avoiding groove 1342 is in the range of [0.1mm-2mm], specifically, the thickness h of the bottom wall of the avoiding groove 1342 can be 0.1mm, 0.4mm, 0.8mm, 1.2mm, 1.6mm, 2mm or other values between 0.1mm and 2mm, which is not limited herein.

[0142] According to the design parameters of the avoiding groove 1342 in the embodiments of the present application, the pressure relief mechanism 1111 can work normally, and the safety of the battery 10 is ensured.

[0143] According to some embodiments of the present application, as shown in FIG. 1, Figure 10 and Figure 11 As shown, a plurality of support plates 13 may be provided, and the plurality of support plates 13 may be spaced apart from each other. The avoidance structure 134 may include an avoidance gap 1343 between two adjacent support plates 13 .

[0144] 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.

[0145] 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.

[0146] The power-consuming device may be any of the aforementioned devices or systems using the battery 10 .

[0147] According to the first embodiment of the present application, Figure 2-Figure 3 As shown, the present application provides a battery 10 , which includes a box 12 , a battery cell group 11 , a support plate 13 , a connecting plate 14 and a connecting portion 15 .

[0148] 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.

[0149] 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 .

[0150] The support plate 13 is installed in the cavity 124. The support plate 13 is a metal component and is spaced apart from the box body 12. The connecting plate 14 is an insulating component and is disposed between the support plate 13 and the bottom plate 121 and connected to the support plate 13 and the bottom plate 121 respectively. The support plate 13 is insulated from the box body 12 by the connecting plate 14. A plurality of connecting plates 14 can be provided, and the plurality of connecting plates 14 can be spaced apart along the width direction of the box body 12.

[0151] The battery cell group 11 is mounted on the support plate 13 and supports the battery cells 111 via the support plate 13 , so that the battery cells 111 are relatively insulated from the box 12 , and the insulation resistance R1 between the support plate 13 and the box 12 is ≥1 MΩ.

[0152] There are multiple support plates 13 , and the multiple support plates 13 are spaced apart from each other. There are multiple battery cell groups 11 , and the multiple battery cell groups 11 are arranged in a one-to-one correspondence with the support plates 13 .

[0153] 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 a connector 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, one for connecting to each end of the flow channel 133 within the support plate 13. The adjacent interfaces of two adjacent support plates 13 are connected via the connector 15, and the two interfaces of each support plate 13 are located on the same side of the longitudinal direction of the housing 12.

[0154] 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 a preferred embodiment, 0.05V / KΩ≤U1 / R3≤200V / KΩ.

[0155] According to the second embodiment of the present application, Figure 4-Figure 5 As shown, 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 .

[0156] 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.

[0157] 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.

[0158] According to the third embodiment of the present application, Figure 6-Figure 9As shown, 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 .

[0159] The configuration of the box 12 , the battery cell group 11 and the connecting plate 14 is similar to that of the second embodiment and will not be described in detail here.

[0160] The difference between this embodiment and the second 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 satisfies: 2mm≤H≤10mm, and the bottom wall thickness h of the avoidance groove 1342 satisfies: 0.1mm≤h≤2mm.

[0161] According to the fourth embodiment of the present application, Figure 10-11 As shown, 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 .

[0162] 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.

[0163] 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 .

[0164] 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.

[0165] 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 housed in the cavity, the battery cell group comprising a plurality of arranged battery cells; A plurality of support plates, wherein the plurality of support plates are spaced apart from each other and installed in the cavity, each support plate supports at least one of the battery cell groups, the bottom surface of the battery cell without an electrode terminal is supported on the support plate, the support plate is spaced apart from the box body, a connecting plate is provided between the side of the support plate facing away from the battery cell group and the box body, the connecting plate is an insulating member and is respectively connected to the support plate and the box body, a flow channel for circulating a heat exchange medium is provided in the support plate, 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.

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 ≥ 1 MΩ.

3. The battery according to claim 1 or 2, characterized in that The support plate is a metal part.

4. The battery according to any one of claims 1 to 3, characterized in that The battery cell groups are provided in plurality, and the plurality of battery cell groups are provided in a one-to-one correspondence with the plurality of support plates.

5. The battery according to any one of claims 1 to 4, characterized in that 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: 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.

6. The battery according to claim 5, characterized in that 50V≤U1≤400V, 1KΩ≤R3≤1000KΩ.

7. The battery according to claim 5, characterized in that 0.05V / KΩ≤U1 / R3≤200V / KΩ.

8. The battery according to any one of claims 1 to 7, 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.

9. The battery according to claim 8, 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.

10. The battery according to claim 8 or 9, characterized in that The avoidance structure includes a through hole provided on the support plate.

11. The battery according to any one of claims 8 to 10, characterized in that The avoidance structure includes an avoidance groove provided on the support plate, and a notch of the avoidance groove faces the pressure relief mechanism.

12. The battery according to claim 11, 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.

13. The battery according to any one of claims 8 to 12, characterized in that The support plates are provided in plurality, and the plurality of support plates are spaced apart from each other. The avoidance structure includes an avoidance gap between two adjacent support plates.

14. An electrical device, characterized in that: include: The battery according to any one of claims 1 to 13, wherein the battery is used to provide electrical energy.

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