Battery and electric device

Abstract

The embodiment of the invention provides a battery and an electric device, and belongs to the technical field of batteries. The battery comprises a box body with a cavity; the battery monomer group is accommodated in the cavity, and the battery monomer group comprises a plurality of battery monomers which are arranged; the plurality of supporting plates are arranged in the cavity at intervals, each supporting plate supports at least one battery monomer group, the bottom surfaces, without the electrode terminals, of the battery monomers are supported on the supporting plates, the supporting plates and the box body are arranged at intervals, and a connecting plate is arranged between one side, deviating from the battery monomer group, of each supporting plate and the box body; the connecting plates are insulating parts and are respectively connected with the supporting plates and the box body, the supporting plates are internally provided with flow channels through which a heat exchange medium flows, the heat exchange medium is used for adjusting the temperature of the single batteries, the flow channels of the plurality of supporting plates are communicated through connecting parts, and the connecting parts are insulating parts. According to the battery provided by the embodiment of the invention, the probability of short circuit and high-voltage breakdown of the battery and the probability of double-point insulation failure during thermal runaway of the battery monomer 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] Generally, in batteries, the box and the liquid-cooled support plate of the battery cell group are designed to be equipotential. When a battery cell loses control, the insulation design between the battery cell and the support plate is damaged, resulting in the support plate, box and battery cell being designed to be equipotential. The high-temperature smoke damages the insulation design of the high-voltage parts of the remaining battery cells, causing ignition with the box, resulting in double-point insulation failure, which poses 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, thus causing 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 is contained in the cavity, wherein the battery cell group includes a plurality of arranged battery cells;

[0007] A plurality of support plates, wherein the plurality of support plates are installed in the cavity with a spacing therebetween, each of the support plates 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, a connecting plate is provided between the side of the support plate facing away from the battery cell group and the box, the connecting plate is an insulating member and is respectively connected to the support plate and the box, 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 plurality of support plates and connecting plates in combination, the probability of short circuit and high-voltage breakdown of the battery can be reduced, and 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 is convenient for the thermal management design of the battery cell.

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

[0010] In the above technical solution, the insulation requirements between the battery cell and the box are met, the insulation effect is better, the breakdown probability is reduced, and the safety of the battery is guaranteed.

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

[0012] In the above technical solution, the thermal management capability of the battery cells can be improved while ensuring the insulation design.

[0013] In some embodiments, the battery cell group is provided in plurality, and the plurality of battery cell groups are provided in one-to-one correspondence with the plurality of support plates.

[0014] 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 increased, which is convenient for management.

[0015] In some embodiments, in two adjacent battery cell groups installed 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, and the resistance of the heat exchange medium in the connecting portion is R3, satisfying:

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

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

[0019] 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.

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

[0021] In the above technical solution, by limiting the preferred value range of U1 / R3, the battery is safer.

[0022] 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 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, the 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, satisfying: 2mm≤H≤10mm; and / or, the bottom wall thickness of the avoidance groove is h, satisfying: 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 comprises an avoidance gap between two adjacent support plates.

[0033] In the above technical solution, the avoidance gap is set to play the role of the pressure relief mechanism, which is simple to produce and process, and is beneficial to reducing production costs.

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

[0035] A battery as described in any of the above embodiments, wherein the battery 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 when the battery cells in the battery thermally run away 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 drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

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

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

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

[0041] Figure 4 The sixth structural explosion diagram of a battery provided in some embodiments of the present application;

[0042] Figure 5 One of the partial structural explosion diagrams 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 One of the partial cross-sectional structural schematic diagrams of a battery provided in some embodiments of the present application;

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

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

[0048] Fig.11 A fifth exploded view of the local structure of a battery provided for 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] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0057] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0058] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0059] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0061] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0062] The battery cells mentioned in the embodiments of the present application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present application. The battery cells may be cylindrical, flat, rectangular or other shapes, etc., which are not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which are not limited in the embodiments of the present application.

[0063] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0064] The battery cell includes a shell, an electrode assembly and an electrolyte, and the shell is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. An electrode terminal is provided on the shell, and the electrode terminal is electrically connected to the tab. The electrode terminal may be directly connected to the tab, or may be indirectly connected to the tab through a transition component; the electrode terminal may include a positive electrode terminal and a negative electrode terminal, and the positive electrode terminal and the negative electrode terminal are electrically connected to the positive electrode tab and the negative electrode tab, respectively.

[0065] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0066] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and multiple battery cells contained in the box. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of safety and cycle life.

[0067] In general batteries, the box and the support plate of the battery cell group are designed to be equipotential. When a battery cell loses control, the insulation design between the battery cell and the support plate is damaged, resulting in the support plate, box and battery cell being equipotential. The high-temperature smoke damages the insulation design of the high-voltage parts of the remaining battery cells, causing ignition with the box, resulting in double-point insulation failure, posing a safety hazard.

[0068] Based on the above considerations, in order to solve the problem that thermal runaway of a battery cell in a battery may easily lead to a double-point insulation failure scenario in the battery, thus causing a safety hazard, the present application designs a battery, including a box, a support plate and a battery cell group, the box having a cavity, the battery cell group being accommodated in the cavity, the battery cell group including a plurality of arranged battery cells, the support plate being installed in the cavity, the battery cell group being 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 housing. Even if the insulation between the battery cell and the support plate fails, the insulation arrangement between the support plate and the housing makes it difficult for the battery cell to be connected to the housing, thereby reducing the possibility of double-point insulation failure and improving the safety performance of the battery.

[0070] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0071] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device in an embodiment of the present application.

[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 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 20, a controller 30 and a battery 10 may be arranged inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 20. For example, a battery 10 may be arranged at the bottom, front or rear of the vehicle 1. The battery 10 may be used to power the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0073] In order to meet different power usage 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 connection and parallel connection.

[0074] like Figure 2As shown, it is an exploded view of the structure of a battery 10 of an embodiment of the present application. The battery 10 includes a box 12 and a plurality of battery cells 111, and the battery cells 111 are used to be accommodated in the box 12. Among them, the box 12 is used to provide an assembly space for the battery cells 111, and the box 12 can adopt a variety of structures. In some embodiments, the box 12 may include a bottom plate 121, a top cover 122 and a frame 123, and the frame 123 may be a hollow structure with two ends open. The bottom plate 121 and the top cover 122 are respectively covered on the open sides of the frame 123, and the bottom plate 121, the top cover 122 and the frame 123 jointly define a cavity 124, and the cavity 124 is an assembly space for accommodating the battery cells 111. Of course, the box 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, multiple battery cells 111 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple battery cells 111 are connected in series and in parallel. Multiple battery cells 111 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by multiple battery cells 111 is accommodated in the box 12; of course, the battery 10 can also be in the form of multiple battery cells 111 first connected in series, in parallel, or in a mixed connection to form a battery cell group 11, and then multiple battery cell groups 11 are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 12. The battery 10 may also include other structures, for example, the battery 10 may also include a converging component for realizing electrical connection between multiple battery cells 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 of the box body 12 and the width direction of the box body 12, and the first direction X and the second direction Y are perpendicular to each other.

[0077] Each battery cell 111 may 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 may 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 body 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 box 12 may be the box 12 of the above-mentioned embodiment, which will not be described in detail here. In this embodiment, the box 12 may be arranged in a rectangular parallelepiped. The battery cell group 11 may be accommodated in the cavity 124. The battery cell group 11 may include a plurality of 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 according to 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. Exemplarily, the bottom surface of the battery cell 111 without the electrode terminal can be the bottom surface on the side 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 spaced apart 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 have thermal runaway, causing the insulating layer on the bottom surface of the battery cells 111 where no electrode terminals are provided to fail, the insulating setting between the battery cells 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, and the bottom surfaces of multiple battery cells 111 without electrode terminals are fixed on the support plate 13 by bonding. In the event that a battery cell 111 has 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 parts 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] According to the battery 10 provided in the embodiment of the present application, the probability of double-point insulation failure occurring when the battery cell 111 is in thermal runaway can be reduced, thereby improving the safety of the battery 10.

[0085] According to some embodiments of the present application, the insulation resistance between the support plate 13 and the box body 12 is R1, which can satisfy: R1 ≥ 1MΩ. Optionally, R1 can be 1MΩ, 2MΩ, 3MΩ, 5MΩ, 10MΩ or other resistance values ​​greater than or equal to 1MΩ, which is 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, 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 away from the battery cell group 11 and the box body 12, and 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 with 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, and 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 may be an insulating member, and the supporting plate 13 is spaced apart from the box body 12 to insulate the supporting plate 13 from the box body 12. A plurality of connecting plates 14 may be provided, and the plurality of connecting plates 14 are spaced apart to ensure installation strength and reduce material costs.

[0091] According to the embodiment of the present application, by setting 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 can be 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, and each support plate 13 may support at least one battery cell group 11 .

[0093] In this embodiment, a plurality of support plates 13 may be provided, and the plurality of support plates 13 are all connected to the box body 12 through a connecting plate 14, so that the plurality of support plates 13 are insulated from the box body 12, and the plurality of support plates 13 may be spaced apart from each other, so that the plurality of support plates 13 are relatively insulated from each other, each support plate 13 may support at least one battery cell group 11, and the battery cell groups 11 on different support plates 13 are also spaced apart from each other.

[0094] In the case of thermal runaway of the battery cell 111, the insulating layer at the bottom of the battery cell 111 is damaged, which may easily lead to the damage of 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 case 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 a high-voltage breakdown of the battery 10, posing a safety hazard.

[0095] By providing a plurality of 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 not easily turned on to 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 than four, 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 needs 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 , thereby improving 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, one battery cell group 11 is provided on each support plate 13, 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 for easy management.

[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 flow may be provided in the support plate 13 , and 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 the circulation of 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 use efficiency and service life of the battery cell 111.

[0102] The flow channels 133 of multiple support plates 13 can be connected through the connecting part 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, which is convenient for installation. The connecting part 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 the case where there are two support plates 13 as an example, the two support plates 13 are respectively provided with an inlet and an outlet, the inlet of the first of the two support plates 13 is used to connect with the outlet of the external heat exchanger to introduce the heat exchange medium into the battery 10, and the outlet of the first of the two support plates 13 is connected with the inlet of the second through the connecting portion 15, so that the heat exchange medium enters the second after circulating in the first of the two support plates 13, and flows out through the outlet of the second to circulate to the inlet of the heat exchanger, completing a circulation of the heat exchange medium. Among them, the inlet and outlet of the two support plates 13 can be set on the same side to reduce the space occupied by the pipe joint and the connecting portion 15, and improve the space utilization inside 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 installed 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:

[0106] 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 15, and S is the flow cross-sectional area of ​​the connecting portion 15.

[0107] 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 made of a conductive material. After the flow channels 133 of 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 sparks, 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 cause the heat exchange medium to leak, posing a safety hazard.

[0108] 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 may 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.

[0109] It can be understood 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 .

[0110] 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 under different U1 / R3 conditions are tested to obtain a reasonable range of U1 / R3, with reference to Table 2, which shows the performance of two adjacent battery cells 111 belonging to two adjacent battery cell groups 11 installed on two adjacent support plates 13 under different U1 / R3 conditions after thermal runaway.

[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 400V / KΩ, in two adjacent battery cell groups 11 installed on two adjacent support plates 13, two adjacent battery cells 111 belonging to two adjacent battery cell groups 11 will cause ignition after thermal runaway, which is likely to cause safety hazards. In Example 9, when U1 / R3 is equal to 400V / KΩ, the connection part 15 heats up significantly, but does not cause ignition, which is the maximum critical point. When U1 / R3≤400V / KΩ, it will not cause ignition, and the safety is relatively high.

[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 no specific limitation is made 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 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 used 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 has 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, the safety is higher but the cost performance is lower. When U1 is at a minimum value, R3 has a maximum value so that the electrical conductivity of the connection 15 between adjacent support plates 13 and the heat exchange medium will not increase the design cost due to excessive resistance requirements, thereby reducing the design difficulty and reducing the risk of leakage due to the excessive length of the connection 15 or the difficulty of pipeline arrangement.

[0119] According to the above Table 2, when U1 takes a maximum value of 400V, R3 has a minimum value of 1KΩ, and when U1 takes a 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 no specific limitation is made 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 no specific limitation is made 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 has 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-200V / KΩ, and is 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-Figure 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 herein, 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 opened smoothly, 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 a plurality of 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, if Figure 6-Figure 11 As shown, when the pressure relief mechanisms 1111 of multiple battery cells 111 are neatly arranged, 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 an avoidance role for 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 may 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 may be the same as the cross-sectional size of the pressure relief mechanism 1111, or the cross-sectional size of the through hole 1341 may 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 avoidance structure may include an avoidance groove 1342 provided on the support plate 13, and the notch of the avoidance groove 1342 is arranged toward the pressure relief mechanism 1111, so that the pressure relief mechanism 1111 can move into the avoidance groove 1342 when it is opened, and play the role of avoiding the pressure relief mechanism 1111. Among them, the avoidance groove 1342 can extend along the arrangement direction of the battery cells 111, and one or more avoidance grooves 1342 are arranged along the arrangement direction of the battery cells 111, so that one avoidance 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 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.

[0139] When the pressure relief mechanism 1111 is opened, a certain amount of space is required for movement. By limiting the minimum value of the depth H of the avoidance groove 1342, the pressure relief mechanism 1111 has sufficient space for movement. In addition, in the case of thermal runaway of the battery cell 111, the pressure relief mechanism 1111 opens to discharge high-temperature and high-pressure gas to the outside. The high-temperature and high-pressure gas can break through the bottom wall of the avoidance groove 1342 to be discharged from the avoidance groove 1342. By limiting the maximum value of the bottom wall thickness h of the avoidance groove 1342, the discharged gas can break through the bottom wall of the avoidance groove 1342 relatively easily and be discharged smoothly into the box body 12.

[0140] It is understandable that, according to 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 the space utilization rate; similarly, if the bottom wall thickness h of the avoidance groove 1342 is too small, the processing technology requirements are high and the production cost is increased.

[0141] 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.

[0142] 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 ensured.

[0143] According to some embodiments of the present application, Fig.10 and Fig.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, 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 13. The avoidance structure 134 can 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 the production cost.

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

[0146] The electrical 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 body 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 two ends open. The bottom plate 121 and the top cover 122 cover the open sides of the frame 123 respectively. The bottom plate 121 , the top cover 122 and the frame 123 together define a cavity 124 .

[0149] The battery cell group 11 is accommodated 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 part and is spaced apart from the box body 12. The connecting plate 14 is an insulating part, and the connecting plate 14 is arranged between the support plate 13 and the bottom plate 121 and is respectively connected to the support plate 13 and the bottom plate 121. The support plate 13 is insulated from the box body 12 through the connecting plate 14. There may be a plurality of connecting plates 14, and the plurality of connecting plates 14 may 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 a plurality of battery cells 111 through the support plate 13 , so that the plurality of 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 ≥1 MΩ.

[0152] There are a plurality of support plates 13 , and the plurality of support plates 13 are arranged at intervals. There are a plurality of battery cell groups 11 , and the plurality of battery cell groups 11 are arranged in one-to-one correspondence with the support plates 13 .

[0153] Each support plate 13 is provided with a flow channel 133, and a heat exchange medium flows in the flow channel 133. The flow channels 133 of two adjacent support plates 13 are connected through a connecting portion 15, so that the heat exchange medium circulates in the flow channels 133 of multiple support plates 13. Each support plate 13 is provided with two interfaces, which are respectively used to connect with the two ends of the flow channel 133 in the support plate 13. The interfaces of two adjacent support plates 13 that are close to each other are connected through the connecting portion 15, and the two interfaces of each support plate 13 are arranged on the same side of the length direction of the box body 12.

[0154] Among them, in two adjacent battery cell groups 11 installed 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 part 15 is R3, which satisfies: 0.05V / KΩ≤U1 / R3≤400V / KΩ, 50V≤U1≤400V, 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 body 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 herein.

[0157] The difference between this embodiment and the first embodiment lies in 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 plurality of 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 size of the through hole 1341 is not less than the cross-sectional size of the corresponding pressure relief mechanism 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 body 12 , the battery cell group 11 and the connecting plate 14 refer to 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 pool 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 body 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 herein.

[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 an avoidance gap 1343 , and the pressure relief mechanisms 1111 of the plurality of battery cells 111 of the battery cell group 11 correspond to the avoidance gap 1343 .

[0164] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0165] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery, characterized in that: include: A box body having a cavity; A battery cell group is contained in the cavity, wherein the battery cell group includes a plurality of arranged battery cells; A plurality of support plates, wherein the plurality of support plates are installed in the cavity with a spacing therebetween, each of the support plates 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, a connecting plate is provided between the side of the support plate facing away from the battery cell group and the box, the connecting plate is an insulating member and is respectively connected to the support plate and the box, 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≥1MΩ.

3. The battery according to claim 1 or 2, characterized in that: The supporting 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 arranged in plurality, and the plurality of battery cell groups are arranged in 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 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.

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 arranged on the support plate.

11. The battery according to any one of claims 8 to 10, 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.

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 supporting plates are arranged in plurality, the supporting plates are spaced apart from each other, and the avoiding structure comprises an avoiding gap between two adjacent supporting plates.

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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