Battery module, battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery module, a battery and electric equipment. The battery module comprises a positive electrode output end, a negative electrode output end, a plurality of single batteries and at least one confluence piece, the plurality of single batteries are connected through the at least one confluence piece, the positive electrode output end is connected with at least one single battery, and the negative electrode output end is connected with at least another single battery; wherein the surfaces of the positive electrode output end, the negative electrode output end and the confluence piece are respectively provided with an insulating layer, at least one of the positive electrode output end, the negative electrode output end and the confluence piece is further provided with a heat insulation layer, the heat insulation layer is arranged on at least part of the outer surface of the insulating layer, or the heat insulation layer and the insulating layer are an integrated insulating heat insulation layer. According to the battery module provided by the invention, the damage of high-temperature flue gas to the insulating layer can be reduced, the occurrence of a short circuit phenomenon is reduced, and the safety performance of the battery is further improved.

Description

Technical Field

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

[0002] In existing batteries, multiple battery cells are connected to form a battery module through a busbar, and an electrode output terminal is formed at at least one end of the battery module for connection with an external electrical device. The surface of the busbar and the surface of the electrode output terminal are generally coated with an insulating layer to meet insulation requirements. However, when thermal runaway occurs inside the battery, the high-temperature flue gas discharged from the battery cell will impact and ablate the insulating layer, causing the insulation of the insulating layer to fail, which in turn makes it easy for a short circuit to occur inside the battery, and even creates the risk of high-voltage arcing igniting the combustible gas and causing an explosion. Utility Model Content

[0003] In view of the defects of the prior art, the purpose of the present application is to provide a battery module, a battery and an electrical device, which can effectively solve the problem of short circuit inside the battery due to insulation failure of the insulation layer.

[0004] The first aspect of the present application discloses a battery module, comprising:

[0005] Multiple battery cells;

[0006] At least one busbar, a plurality of battery cells are connected via the at least one busbar;

[0007] A positive output terminal, the positive output terminal being connected to at least one of the battery cells;

[0008] A negative output terminal, the negative output terminal being connected to at least another battery cell;

[0009] Among them, the surfaces of the positive output terminal, the negative output terminal and the collector are respectively provided with insulating layers, and at least one of the positive output terminal, the negative output terminal and the collector is also provided with a thermal insulation layer, and the thermal insulation layer is arranged on at least part of the outer surface of the insulating layer, or the thermal insulation layer and the insulating layer are an integrated insulating layer.

[0010] According to the battery module of the present application, by arranging an insulating layer on the surface of the positive output terminal, the negative output terminal and the busbar, under normal temperature conditions, the insulating layer can effectively prevent the positive output terminal, the negative output terminal and the busbar from short-circuiting; by arranging a heat insulating layer on at least one of the positive output terminal, the negative output terminal and the busbar, when thermal runaway occurs in the battery cell, due to the heat insulating effect of the heat insulating layer, the high-temperature flue gas generated will not directly act on the insulating layer provided with the heat insulating layer, thereby reducing the damage to the insulating layer caused by the high-temperature flue gas, reducing the occurrence of short circuits, and thereby improving the safety performance of the battery.

[0011] In some embodiments of the present application, the heat insulation layer is disposed on the outer surface of the insulating layer, and the thickness of the heat insulation layer is D, and the thickness of the insulating layer is d, wherein D>d.

[0012] By setting the thickness of the thermal insulation layer to be larger than the thickness of the insulating layer, the thermal insulation performance of the thermal insulation layer can be improved, thereby reducing the damage to the insulating layer caused by high-temperature flue gas, reducing the occurrence of short circuits, and thereby improving the safety performance of the battery.

[0013] In some embodiments of the present application, the thickness dimension D of the thermal insulation layer is in the range of 0.5 mm ≤ D ≤ 8 mm, and / or the thickness dimension d of the insulation layer is in the range of 0.2 mm ≤ d ≤ 0.5 mm.

[0014] By setting the thickness of the thermal insulation layer and the insulating layer within the above-mentioned size range, the thickness of the thermal insulation layer can be minimized while improving the thermal insulation performance of the thermal insulation layer.

[0015] In some embodiments of the present application, the thermal insulation layer includes a film-like structure or a gel-like structure.

[0016] The thermal insulation layer with a membrane structure or a gel structure can easily cover the entire outer surface of the insulation layer, thereby reducing the damage to the insulation layer caused by high-temperature smoke.

[0017] In some embodiments of the present application, the thermal insulation layer includes a PTFE layer and / or an ETFE layer.

[0018] The material layer formed of PTFE and / or ETFE has good heat insulation performance and is easy to produce and manufacture, so that the heat insulation layer can be arranged on the surface of the insulating layer to reduce the damage to the insulating layer caused by high-temperature smoke.

[0019] In some embodiments of the present application, the thermal insulation layer includes a non-metallic porous material layer.

[0020] The non-metallic porous material layer has good insulation performance. At the same time, the porous structure helps the thermal insulation layer to dissipate heat, thereby reducing the impact and damage to the thermal insulation layer caused by high-temperature smoke.

[0021] In some embodiments of the present application, the non-metallic porous material layer includes a boride ceramic layer.

[0022] The material layer formed by boride ceramics has good thermal insulation performance and can reduce the damage to the insulation layer caused by high-temperature flue gas. At the same time, the surface of the boride ceramic layer has a large number of holes, which can improve the heat dissipation performance of the insulation layer, thereby reducing the damage to the insulation layer under the impact of high-temperature flue gas and further reducing the occurrence of short circuits.

[0023] In some embodiments of the present application, the heat insulating layer and the insulating layer are an integrated insulating heat insulating layer, the insulating heat insulating layer is configured with a minimum heat resistant temperature of 300°C, and the insulating heat insulating layer is configured with a minimum resistance value of 10MΩ / m.

[0024] By configuring the insulating layer to have a minimum heat resistance temperature of 300°C and a minimum resistance of 10MΩ / m, the insulating layer has both insulating and thermal insulation properties. At the same time, there is no need to separately set up a double-layer structure of an insulating layer and a thermal insulation layer, thereby reducing process complexity.

[0025] In some embodiments of the present application, the insulating layer includes a polyimide layer.

[0026] The material layer formed by polyimide has good thermal insulation and insulating properties, so that the insulating and heat-insulating layer has both insulating and heat-insulating properties. At the same time, there is no need to separately set up a double-layer structure of an insulating layer and a heat-insulating layer, thereby reducing process complexity.

[0027] In some embodiments of the present application, the battery cell includes a first surface with the largest area, at least some of the multiple battery cells are arranged along a first direction, the first direction is perpendicular or parallel to the first surface, the positive output terminal and the negative output terminal are jointly arranged at the same end of the battery module along the first direction, or the positive output terminal and the negative output terminal are respectively arranged at two ends of the battery module along the first direction.

[0028] The battery module of the present application can be respectively suitable for arranging the positive output terminal and the negative output terminal on the same side of the battery module, or arranging the positive output terminal and the negative output terminal on both sides of the battery module, and by providing a thermal insulation layer on at least one of the positive output terminal, the negative output terminal and the busbar. When thermal runaway occurs in the battery cell, due to the thermal insulation effect of the thermal insulation layer, the high-temperature flue gas generated will not directly act on the insulating layer provided with the thermal insulation layer, thereby reducing the damage to the insulating layer caused by the high-temperature flue gas, reducing the occurrence of short circuit phenomenon, and thereby improving the safety performance of the battery.

[0029] In some embodiments of the present application, the first direction is perpendicular to the first surface, and the positive output terminal and the negative output terminal are disposed at the same end of the battery module along the first direction.

[0030] By arranging the positive output terminal and the negative output terminal at the same end of the battery module along the first direction, and the first direction is perpendicular to the first surface, that is, arranging the positive output terminal and the negative output terminal at the same large surface side of the battery module, it is also possible to reduce the damage to the insulation layer caused by high-temperature flue gas by arranging a heat insulation layer, thereby reducing the occurrence of short circuit.

[0031] In some embodiments of the present application, all of the battery cells in the plurality of battery cells are arranged along a first direction, and all of the battery cells are connected in parallel to each other via a busbar.

[0032] The technical solution of the present application can be applied to a battery module in which multiple battery cells are formed in parallel. By providing a thermal insulation layer on at least one of the positive output terminal, the negative output terminal and the busbar, when thermal runaway occurs in the battery cell, due to the thermal insulation effect of the thermal insulation layer, the high-temperature flue gas generated will not directly act on the insulating layer provided with the thermal insulation layer, thereby reducing the damage to the insulating layer caused by the high-temperature flue gas, reducing the occurrence of short circuits, and thereby improving the safety performance of the battery.

[0033] In some embodiments of the present application, the plurality of battery cells include a plurality of rows of battery cells arranged along a second direction, the plurality of rows of battery cells being connected in series with each other via a busbar, and any row of battery cells includes at least some of the battery cells arranged along a first direction, at least some of the battery cells being connected in series with each other via a busbar, wherein the second direction is perpendicular to the first direction.

[0034] The technical solution of the present application can be applied to a battery module in which multiple battery cells are connected in series. By providing a thermal insulation layer on at least one of the positive output terminal, the negative output terminal and the busbar, when thermal runaway occurs in the battery cell, due to the thermal insulation effect of the thermal insulation layer, the high-temperature flue gas generated will not directly act on the insulating layer provided with the thermal insulation layer, thereby reducing the damage to the insulating layer caused by the high-temperature flue gas, reducing the occurrence of short circuits, and thereby improving the safety performance of the battery.

[0035] In some embodiments of the present application, the surface of the positive output terminal, the surface of the negative output terminal, and the surface of the bus bar are respectively covered with a heat insulation layer.

[0036] By covering the surface of the positive output terminal, the surface of the negative output terminal and the surface of the collector with insulation layers respectively, the damage caused by high-temperature flue gas to the surface insulation layer of the positive output terminal can be reduced, the damage caused by high-temperature flue gas to the surface insulation layer of the negative output terminal can be reduced, and the damage caused by high-temperature flue gas to the surface insulation layer of the collector can be reduced, thereby reducing the occurrence of short circuit and improving the safety performance of the battery.

[0037] A second aspect of the present application discloses a battery, comprising any of the above-mentioned battery modules, the battery further comprising a box body, a receiving cavity is formed inside the box body, and the battery module is arranged in the receiving cavity.

[0038] The third aspect of the present application discloses an electrical device, comprising the above-mentioned battery, and the battery is used to supply power to the electrical device.

[0039] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0041] Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0042] Figure 2 is a schematic diagram of the structure of a battery provided in one embodiment of the present application;

[0043] Figure 3 is a schematic diagram of the exploded structure of a battery cell provided in one embodiment of the present application;

[0044] Figure 4 This is a schematic diagram of a structure in which a plurality of battery cells are connected in parallel to form a battery module according to an embodiment of the present application;

[0045] Figure 5 It is a schematic diagram of a structure in which a plurality of battery cells are connected in series to form a battery module according to an embodiment of the present application;

[0046] Figure 6 This is a schematic diagram of the structure of two battery cells connected in series to form a battery module according to an embodiment of the present application;

[0047] Figure 7 yes Figure 4 A schematic diagram of the AA cross-sectional structure of an embodiment of a middle busbar;

[0048] Figure 8 yes Figure 4 A schematic diagram of the AA cross-sectional structure of another embodiment of the middle busbar;

[0049] Fig. 9 yes Figure 4 AA cross-sectional structural diagram of another embodiment of the middle busbar.

[0050] The reference numerals in the specific implementation manner are as follows:

[0051] 1. Vehicles;

[0052] 10. Battery; 11. Controller; 12. Motor;

[0053] 20. Battery module; 21. Battery cell; 211. End cap; 212. Housing; 213. Electrode assembly; 214. Positive terminal; 215. Negative terminal; 216. First surface;

[0054] 30. Box body; 301. First part; 302. Second part;

[0055] 40. Busbars;

[0056] 50. Positive output terminal;

[0057] 60. Negative output terminal;

[0058] 70. Insulation layer;

[0059] 80. Thermal insulation layer;

[0060] 90. Insulation layer. DETAILED DESCRIPTION

[0061] The following detailed description of the implementation of the technical solution of the present application is provided in conjunction with the accompanying drawings. The following implementation is only used to more clearly illustrate the technical solution of the present application, and is therefore only used as an example, and cannot be used to limit the scope of protection of the present application.

[0062] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0063] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0064] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0065] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0066] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0068] In existing batteries, multiple battery cells are connected to form a battery module through a busbar, and an electrode output terminal is formed at at least one end of the battery module for connection with an external electrical device. The surface of the busbar and the surface of the electrode output terminal are generally coated with an insulating layer to meet insulation requirements. However, when thermal runaway occurs inside the battery, the high-temperature flue gas discharged from the battery cell will impact and ablate the insulating layer, causing the insulation of the insulating layer to fail, which in turn makes it easy for a short circuit to occur inside the battery, and even creates the risk of high-voltage arcing igniting the combustible gas and causing an explosion.

[0069] In order to solve the problem of short circuit inside the battery due to insulation failure of the insulating layer, the present application proposes a battery module, a battery having the battery module, and an electrical device having the battery. According to the battery module, battery and electrical device of the present application, when thermal runaway occurs in the battery cell, due to the thermal insulation effect of the thermal insulation layer, the high-temperature flue gas generated will not directly act on the insulating layer provided with the thermal insulation layer, thereby reducing the damage to the insulating layer caused by the high-temperature flue gas, reducing the occurrence of short circuit, and thereby improving the safety performance of the battery.

[0070] The battery in the present application is suitable for various battery-using electrical devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; the battery is used to provide electrical energy for the above-mentioned electrical devices.

[0071] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the batteries and electrical equipment described above, but can also be applied to all batteries including a box and electrical equipment using the battery. However, for the sake of simplicity, the following embodiments are explained using electric vehicles as an example.

[0072] Figure 1 This is a schematic diagram of the structure of a vehicle 1 provided in some embodiments of the present application. Figure 1 As shown, the vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 10 is arranged inside the vehicle 1, and the battery 10 can be arranged at the bottom, head or tail 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. The vehicle 1 can also include a controller 11 and a motor 12, and the controller 11 is used to control the battery 10 to power the motor 12, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0073] In some embodiments of the present application, the battery 10 can be used not only 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 .

[0074] Figure 2 It is a schematic diagram of the structure of a battery 10 according to an embodiment of the present application. In order to meet different power requirements, the battery 10 may include a plurality of battery cells 21, and the battery cell 21 refers to the smallest unit constituting a battery module 20 or a battery pack. A plurality of battery cells 21 can be connected in series and / or in parallel via electrode terminals for application in various applications. The battery mentioned in the present application includes a battery module 20 or a battery pack. Among them, a plurality of battery cells 21 can be connected in series, in parallel, or in mixed connection, and mixed connection refers to a mixture of series connection and parallel connection. The battery 10 may also be referred to as a battery pack. In the embodiment of the present application, a plurality of battery cells 21 may directly constitute a battery pack, or may first constitute a battery module 20, and the battery module 20 may then constitute a battery pack.

[0075] The battery 10 may include a plurality of battery modules 20 and a housing 30, wherein the plurality of battery modules 20 are contained inside the housing 30. The housing 30 is used to contain the battery cells 21 or the battery modules 20 to reduce the effect of liquid or other foreign matter on the charging or discharging of the battery cells 21. The housing 30 may be a simple three-dimensional structure such as a single rectangular parallelepiped, a cylinder or a sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as rectangular parallelepiped, a cylinder or a sphere. The material of the housing 30 may be an alloy material such as aluminum alloy, iron alloy, or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin.

[0076] In some embodiments, the box body 30 may include a first portion 301 and a second portion 302, the first portion 301 and the second portion 302 cover each other, and the first portion 301 and the second portion 302 jointly define a space for accommodating the battery cell 21. The second portion 302 may be a hollow structure with one end open, and the first portion 301 may be a plate-like structure, and the first portion 301 covers the open side of the second portion 302, so that the first portion 301 and the second portion 302 jointly define a space for accommodating the battery cell 21; the first portion 301 and the second portion 302 may also be hollow structures with one side open, and the open side of the first portion 301 covers the open side of the second portion 302.

[0077] The battery module 20 may include a plurality of battery cells 21. The plurality of battery cells 21 may be connected in series, in parallel, or in a mixed connection to form a battery module 20, and the plurality of battery modules 20 may be connected in series, in parallel, or in a mixed connection to form a battery 10. The battery cell 21 may be cylindrical, flat, rectangular, or in other shapes, and the embodiments of the present application are not limited thereto. The battery cells 21 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 the present application are not limited thereto. However, for the sake of simplicity, the following embodiments are all described using square lithium-ion battery cells 21 as an example. The technical solution of the present application is also suitable for battery modules composed of cylindrical battery cells or other types of battery cells.

[0078] Figure 3 The schematic diagram of the exploded structure of the battery cell 21 provided in some embodiments of the present application. The battery cell 21 refers to the smallest unit constituting the battery 10. Figure 3 The battery cell 21 includes an end cover 211 , a shell 212 and an electrode assembly 213 .

[0079] The end cap 211 refers to a component that covers the opening of the shell 212 to isolate the internal environment of the battery cell 21 from the external environment. Without limitation, the shape of the end cap 211 can be adapted to the shape of the shell 212 to match the shell 212. Optionally, the end cap 211 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 211 is not easily deformed when squeezed and collided, so that the battery cell 21 can have a higher structural strength and the safety performance can also be improved. Functional components such as a positive terminal 214 and a negative terminal 215 can be provided on the end cap 211. The positive terminal 214 and the negative terminal 215 can be used to electrically connect to the electrode assembly 213, respectively, for outputting or inputting electrical energy of the battery cell 21. In some embodiments, the end cap 211 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold. In some embodiments, an insulating member may be provided inside the end cap 211, and the insulating member may be used to isolate the electrical connection components in the housing 212 from the end cap 211 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0080] The shell 212 is a component used to cooperate with the end cap 211 to form the internal environment of the battery cell 21, wherein the formed internal environment can be used to accommodate the electrode assembly 213, the electrolyte (not shown in the figure) and other components. The shell 212 and the end cap 211 can be independent components, and an opening can be set on the shell 212, and the internal environment of the battery cell 21 is formed by covering the opening with the end cap 211 at the opening. Without limitation, the end cap 211 and the shell 212 can also be integrated. Specifically, the end cap 211 and the shell 212 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 212, the end cap 211 covers the shell 212. The shell 212 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 212 can be determined according to the specific shape and size of the electrode assembly 213. The material of the shell 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0081] The electrode assembly 213 is a component in the battery cell 21 where an electrochemical reaction occurs. One or more electrode assemblies 213 may be included in the housing 212. The electrode assembly 213 is mainly formed by winding or stacking the positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 213, and the parts of the positive and negative electrode sheets without active materials each constitute a pole ear (not shown in the figure). The positive pole ear and the negative pole ear may be located together at one end of the main body or at both ends of the main body respectively. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, the positive pole ear is connected to the positive terminal 214, and the negative pole ear is connected to the negative terminal 215 to form a current loop.

[0082] Combination Figures 2 to 7 As shown, in some embodiments of the present application, the battery module 20 includes a positive output terminal 50, a negative output terminal 60, a plurality of battery cells 21 and at least one bus 40, the plurality of battery cells 21 are connected via at least one bus 40, the positive output terminal 50 is connected to at least one of the battery cells 21, and the negative output terminal 60 is connected to at least another of the battery cells 21; wherein, surfaces of the positive output terminal 50, the negative output terminal 60 and the bus 40 are respectively provided with an insulating layer 70, and at least one of the positive output terminal 50, the negative output terminal 60 and the bus 40 is further provided with a heat insulating layer 80, the heat insulating layer 80 is provided on at least a portion of the outer surface of the insulating layer 70, or the heat insulating layer 80 and the insulating layer 70 are an integrated insulating heat insulating layer 90.

[0083] Specifically, after multiple battery cells 21 are connected in series or in parallel to form a battery module 20 through a busbar, the positive output terminal 50 can be connected to the positive terminal 214 of a battery cell 21 in the battery module 20, thereby forming the positive electrode of the entire battery module 20, and the negative output terminal 60 can be connected to the negative terminal 215 of a battery cell 21 in the battery module 20, thereby forming the negative electrode of the entire battery module 20, so that the voltage of the battery module 20 is jointly output through the positive output terminal 50 and the negative output terminal 60.

[0084] The positive output terminal 50 can be directly connected to the positive terminal 214 of the battery cell 21, and the negative output terminal 60 can be directly connected to the negative terminal 215 of the battery cell 21. Figure 5 or Figure 6 Alternatively, the positive output terminal 50 may be connected to the positive terminal 214 of the battery cell 21 through the busbar 40, and the negative output terminal 60 may be connected to the negative terminal 215 of the battery cell 21 through the busbar 40, as shown. Figure 4 shown.

[0085] In some embodiments of the present application, the outer surfaces of the positive output terminal 50 and the negative output terminal 60 are respectively provided with an insulating layer 70, and the insulating layer 70 can be an insulating layer in the prior art, and its material and composition are not described in detail here. By providing the insulating layer 70 on the outer surfaces of the positive output terminal 50 and the negative output terminal 60, respectively, it is possible to prevent a short circuit between the positive output terminal 50 and the negative output terminal 60 at room temperature, and at the same time, prevent any of the positive output terminal 50 and the negative output terminal 60 from short-circuiting with the battery cell 21 at room temperature, thereby improving the safety performance of the battery 10.

[0086] In some embodiments of the present application, the outer surface of the busbar 40 is also provided with an insulating layer 70, and the insulating layer 70 can be consistent with the insulating layer 70 on the surface of the positive output terminal 50 or the negative output terminal 60. By providing the insulating layer 70 on the outer surface of the busbar 40, it is possible to prevent the busbar 40 from short-circuiting with the battery cell 21 at room temperature, thereby improving the safety performance of the battery 10.

[0087] However, the insulating layer 70 can only meet the insulation requirements under normal temperature. When the battery cell 21 has thermal runaway, the high-temperature gas generated will impact or ablate the insulating layer 70, thereby causing the insulation failure of the insulating layer 70, and then causing a short circuit or even explosion inside the battery 10. Therefore, in the present application, a heat insulation layer 80 is also provided on the surface of at least part of the insulating layer 70. The heat insulation layer 80 is configured to isolate the high-temperature flue gas generated when the battery cell 21 has thermal runaway from acting on the insulating layer 70, so that the generated high-temperature flue gas will not directly act on the insulating layer 70 provided with the heat insulation layer 80, thereby reducing the damage caused by the high-temperature flue gas to the insulating layer 70, reducing the occurrence of short circuits, and thus improving the safety performance of the battery 10.

[0088] Combination Figure 2 , Figure 4 and Figure 7 As shown, in some embodiments of the present application, the heat insulation layer 80 is disposed on the outer surface of the insulating layer 70, and the thickness dimension of the heat insulation layer 80 is D, and the thickness dimension of the insulating layer 70 is d, wherein D>d.

[0089] For the convenience of description, this application only takes the case where the heat insulation layer 80 is provided on the surface of the busbar 40 as an example for explanation. Specifically, the outer surface of the busbar 40 is coated with the insulation layer 70, and the surface of the insulation layer 70 away from the busbar 40 is coated with the heat insulation layer 80. Along the arrangement direction of the busbar 40 and the battery cell 21, that is, the thickness direction of the busbar 40, the heat insulation layer 80 has a thickness dimension D, and the insulation layer 70 has a thickness dimension d, wherein D>d.

[0090] By setting the thickness of the thermal insulation layer 80 to be greater than the thickness of the insulating layer 70 , the thermal insulation performance of the thermal insulation layer 80 can be improved, thereby reducing the damage to the insulating layer 70 caused by high-temperature flue gas, reducing the occurrence of short circuits, and thereby improving the safety performance of the battery 10.

[0091] Combination Figure 4 and Figure 7 As shown, in some embodiments of the present application, the thickness dimension D of the thermal insulation layer 80 is in the range of 0.5 mm ≤ D ≤ 8 mm, and / or the thickness dimension d of the insulating layer 70 is in the range of 0.2 mm ≤ d ≤ 0.5 mm.

[0092] Specifically, along the arrangement direction of the busbar 40 and the battery cell 21, the thickness dimension D of the heat insulating layer 80 can be any value from 0.5mm…0.6mm…1mm…5mm…8mm. Along the arrangement direction of the busbar 40 and the battery cell 21, the thickness dimension d of the insulating layer 70 can be any value from 0.2mm…0.25mm…0.3mm…0.4mm…0.5mm.

[0093] By setting the thickness of the heat insulating layer 80 and the insulating layer 70 within the above-mentioned size range, the thickness of the heat insulating layer 80 can be minimized while improving the heat insulating performance of the heat insulating layer 80 .

[0094] Combination Figure 4 and Figure 7 As shown, in some embodiments of the present application, the heat insulation layer 80 includes a film-like structure or a gel-like structure.

[0095] The heat insulating layer 80 of a film-like structure or a gel-like structure can easily cover the entire outer surface of the insulating layer 70 , thereby reducing damage to the insulating layer 70 caused by high-temperature smoke.

[0096] Combination Figure 4 and Figure 7 As shown, in some embodiments of the present application, the heat insulating layer 80 includes a PTFE (polytetrafluoroethylene) layer and / or an ETFE (ethylene-tetrafluoroethylene copolymer) layer.

[0097] Specifically, the PTFE material and / or ETFE material may be made into a film structure, and the formed film structure may be bonded to the surface of the insulating layer 70. Alternatively, the PTFE material and / or ETFE material with a gel structure may be directly applied to the surface of the insulating layer 70, and the heat insulating layer 80 may be formed on the surface of the insulating layer 70.

[0098] The material layer formed of PTFE and / or ETFE has good thermal insulation performance and is easy to produce and manufacture, so that the thermal insulation layer 80 can be arranged on the surface of the insulating layer 70 to reduce the damage to the insulating layer 70 caused by high-temperature smoke.

[0099] Combination Figure 4 and Figure 8 As shown, in some embodiments of the present application, the thermal insulation layer 80 includes a non-metallic porous material layer.

[0100] The non-metallic porous material layer has good insulation properties. At the same time, the porous structure helps the heat insulation layer 80 to dissipate heat, thereby reducing the impact and damage to the heat insulation layer 80 caused by high-temperature smoke.

[0101] Combination Figure 4 and Figure 8 As shown, in some embodiments of the present application, the non-metallic porous material layer includes a boride ceramic layer.

[0102] Specifically, the boride ceramic material may be formed first, and the formed material layer may be bonded to the surface of the insulating layer 70. Alternatively, the boride ceramic material may be directly coated on the surface of the insulating layer 70, and the heat insulating layer 80 may be formed on the surface of the insulating layer 70.

[0103] The material layer formed by boride ceramics has good thermal insulation performance, which can reduce the damage caused by high-temperature flue gas to the insulation layer. At the same time, the surface of the boride ceramic layer has a large number of holes, which can improve the heat dissipation performance of the thermal insulation layer 80, thereby reducing the damage of the thermal insulation layer 80 under the impact of high-temperature flue gas, and further reducing the occurrence of short circuit phenomenon.

[0104] Combination Figure 4 and Fig. 9 As shown, in some embodiments of the present application, the heat insulation layer and the insulating layer are integrated into an insulating heat insulation layer 90, the insulating heat insulation layer 90 is configured to have a minimum heat resistance temperature of 300°C, and the insulating heat insulation layer 90 is configured to have a minimum resistance value of 10MΩ / m.

[0105] Specifically, the heat insulating layer and the insulation layer have the same material composition and together form an integrated insulation and heat insulating layer 90 , so that the insulation and heat insulating layer 90 has both insulation and heat insulating properties.

[0106] By configuring the insulating heat-insulating layer 90 to have a minimum heat-resistant temperature of 300°C and a minimum resistance of 10MΩ / m, the insulating heat-insulating layer 90 has both insulating and heat-insulating properties. At the same time, there is no need to separately set up a double-layer structure of an insulating layer and a heat-insulating layer, thereby reducing process complexity.

[0107] Combination Figure 4 and Fig. 9 As shown, in some embodiments of the present application, the insulating and heat-insulating layer 90 includes a polyimide layer.

[0108] Specifically, the polyimide material may be formed first, and the formed material layer may be bonded to the surface of the busbar 40. Alternatively, the polyimide material may be directly coated on the surface of the busbar 40 to form an insulating layer 90 on the surface of the busbar 40.

[0109] The material layer formed by polyimide has good thermal insulation and insulating properties, so that the insulating and heat-insulating layer 90 has both insulating and heat-insulating properties. At the same time, there is no need to set up a double-layer structure of an insulating layer and a heat-insulating layer separately, reducing the complexity of the process.

[0110] Combination Figures 2 to 7 As shown, in some embodiments of the present application, the battery cell 21 includes a first surface 216 with the largest area, at least some of the multiple battery cells 21 are arranged along a first direction, the first direction is perpendicular or parallel to the first surface 216, the positive output terminal 50 and the negative output terminal 60 are jointly arranged at the same end of the battery module 20 along the first direction, or the positive output terminal 50 and the negative output terminal 60 are respectively arranged at two ends of the battery module 20 along the first direction.

[0111] The battery module 20 of the present application can be respectively suitable for arranging the positive output terminal 50 and the negative output terminal 60 on the same side of the battery module 20, or arranging the positive output terminal 50 and the negative output terminal 60 on both sides of the battery module 20, respectively. By arranging a heat insulation layer 80 on at least one of the positive output terminal 50, the negative output terminal 60 and the busbar 40, when the battery cell 21 has thermal runaway, due to the heat insulation effect of the heat insulation layer 80, the high-temperature flue gas generated will not directly act on the insulating layer 70 provided with the heat insulation layer 80, thereby reducing the damage to the insulating layer 70 caused by the high-temperature flue gas, reducing the occurrence of short circuit phenomenon, and thereby improving the safety performance of the battery 10.

[0112] Combination Figure 4 , Figure 5 and Figure 7 As shown, in some embodiments of the present application, the first direction is perpendicular to the first surface 216 , and the positive output terminal 50 and the negative output terminal 60 are disposed at the same end of the battery module 20 along the first direction.

[0113] By arranging the positive output terminal 50 and the negative output terminal 60 at the same end of the battery module 20 along the first direction, and the first direction is perpendicular to the first surface 216, that is, arranging the positive output terminal 50 and the negative output terminal 60 at the same large surface side of the battery module 20, it is also possible to reduce the damage of the high-temperature flue gas to the insulating layer 70 by setting the thermal insulation layer 80, thereby reducing the occurrence of short circuit.

[0114] Combination Figure 2 , Figure 4 and Figure 7As shown, in some embodiments of the present application, all of the battery cells 21 in the plurality of battery cells 21 are arranged along the first direction, and all of the battery cells 21 are connected in parallel to each other through the busbar 40 .

[0115] Specifically, a plurality of battery cells 21 are arranged in a row along a first direction, and the plurality of battery cells 21 are connected in parallel to each other through a plurality of busbars 40. The first direction is perpendicular to the first surface 216. The positive output terminal 50 and the negative output terminal 60 are connected to the battery cells 21 through the busbars 40, respectively, and the positive output terminal 50 and the negative output terminal 60 are arranged at the same end of the battery module 20 along the first direction.

[0116] The technical solution of the present application can be applied to a battery module 20 in which a plurality of battery cells 21 are formed in parallel. By providing a heat insulating layer 80 on at least one of the positive output terminal 50, the negative output terminal 60 and the busbar 40, when thermal runaway occurs in the battery cell 21, due to the heat insulating effect of the heat insulating layer 80, the high-temperature flue gas generated will not directly act on the insulating layer 70 provided with the heat insulating layer 80, thereby reducing the damage to the insulating layer 70 caused by the high-temperature flue gas, reducing the occurrence of short circuits, and thereby improving the safety performance of the battery 10.

[0117] Combination Figure 2 , Figure 5 and Figure 7 As shown, in some embodiments of the present application, a plurality of battery cells 21 include a plurality of rows of battery cells 21 arranged along a second direction, and the plurality of rows of battery cells 21 are connected in series with each other via a bus 40. Any row of battery cells 21 includes at least some of the battery cells 21 arranged along a first direction, and at least some of the battery cells 21 are connected in series with each other via a bus 40, wherein the second direction is perpendicular to the first direction.

[0118] Specifically, a plurality of battery cells 21 are arranged in a row along the second direction, and two rows of battery cells 21 are connected in series through a busbar 40. The battery cells 21 in any row are arranged in the first direction, and the battery cells 21 in the same row are connected in series through a plurality of busbars 40, wherein the first direction is perpendicular to the first surface 216, and the second direction is perpendicular to the first direction. The positive output terminal 50 is connected to the battery cell 21 at the end of one row, and the negative output terminal 60 is connected to the battery cell 21 at the end of another row, and the positive output terminal 50 and the negative output terminal 60 are arranged at the same end of the battery module 20 along the first direction.

[0119] The technical solution of the present application can be applied to a battery module 20 in which a plurality of battery cells 21 are connected in series. By providing a thermal insulation layer 80 on at least one of the positive output terminal 50, the negative output terminal 60 and the busbar 40, when thermal runaway occurs in the battery cell 21, due to the thermal insulation effect of the thermal insulation layer 80, the high-temperature flue gas generated will not directly act on the insulating layer 70 provided with the thermal insulation layer 80, thereby reducing the damage to the insulating layer 70 caused by the high-temperature flue gas, reducing the occurrence of short circuits, and thereby improving the safety performance of the battery 10.

[0120] like Figure 6 As shown, in some embodiments of the present application, a plurality of battery cells 21 are arranged along a first direction, and the first direction is parallel to the first surface 216. The plurality of battery cells 21 are connected in series through the busbar 40, and along the first direction, the battery cells 21 at both ends of the battery module 20 are connected to the positive output terminal 50 and the negative output terminal 60 respectively.

[0121] Combination Figure 2 , Figure 4 and Figure 7 , Figure 8 and Fig. 9 As shown, in some embodiments of the present application, the surface of the positive output terminal 50 , the surface of the negative output terminal 60 , and the surface of the busbar 40 are respectively covered with a heat insulation layer 80 .

[0122] Combination Figure 4 , Figure 7 and Figure 8 As shown, in some embodiments of the present application, the surface of the positive output terminal 50, the surface of the negative output terminal 60 and the surface of the bus 40 are respectively provided with an insulating layer 70, and the surface of the positive output terminal 50, the surface of the negative output terminal 60 and the surface of the bus 40 are also respectively provided with a heat insulation layer 80, wherein the heat insulation layer 80 is coated on the outer surface of the insulating layer 70.

[0123] Combination Figure 4 and Fig. 9 As shown, in some embodiments of the present application, the surface of the positive output terminal 50 , the surface of the negative output terminal 60 , and the surface of the busbar 40 are respectively provided with an insulating heat-insulating layer 90 .

[0124] By covering the surface of the positive output terminal 50, the surface of the negative output terminal 60 and the surface of the busbar 40 with a heat insulation layer 80 respectively, it is possible to reduce the damage caused by high-temperature flue gas to the surface insulation layer 70 of the positive output terminal 50, reduce the damage caused by high-temperature flue gas to the surface insulation layer 70 of the negative output terminal 60, and reduce the damage caused by high-temperature flue gas to the surface insulation layer 70 of the busbar 40, thereby reducing the occurrence of short circuit and improving the safety performance of the battery 10.

[0125] like Figure 2 As shown, the second aspect of the present application discloses a battery 10, including a battery module 20 of any of the above-mentioned embodiments, and the battery 10 also includes a box body 30, and a receiving cavity is formed inside the box body 30, and the battery module 20 is arranged in the receiving cavity.

[0126] Since the battery 10 in the present application has the same technical features as the battery module 20 in the above embodiment and can achieve the same technical effects, it will not be described in detail here.

[0127] like Figure 1 As shown, the third aspect of the present application discloses an electrical device, comprising the battery 10 of the above embodiment, and the battery 10 is used to supply power to the electrical device.

[0128] Specifically, the electrical device may be a vehicle 1 , which includes a battery 10 according to any one of the above embodiments, and the battery 10 is used to supply power to the vehicle 1 and to drive the vehicle 1 to move.

[0129] Since the vehicle 1 in the present application has the same technical features as the battery 10 in the above-mentioned embodiment and can achieve the same technical effects, it will not be described in detail here.

[0130] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

[0131] Combination Figure 1 and Figure 2 As shown, the present application proposes a vehicle 1, which includes a battery 10, and the battery 10 is used to power the vehicle 1. The battery 10 includes a box 30 and a battery module 20, and a receiving cavity is formed inside the box 30, and the battery module 20 is arranged in the receiving cavity.

[0132] Combination Figure 3 , Figure 4 and Figure 7As shown, the battery module 20 includes a positive output terminal 50, a negative output terminal 60, a plurality of battery cells 21 and a plurality of busbars 40. The battery cell 21 includes a first surface 216 with the largest area, and all of the battery cells 21 are arranged along a first direction, and all of the battery cells 21 are connected in parallel to each other through the busbar 40, and the first direction is perpendicular to the first surface 216. The positive output terminal 50 is connected to the positive terminal 214 of at least one of the battery cells 21 through the busbar 40, and the negative output terminal 60 is connected to the negative terminal 215 of at least another of the battery cells 21 through the busbar 40, and the positive output terminal 50 and the negative output terminal 60 are arranged at the same end of the battery module 20 along the first direction. Among them, the surfaces of the positive output terminal 50, the negative output terminal 60 and the busbar 40 are respectively provided with an insulating layer 70, and the surfaces of the positive output terminal 50, the negative output terminal 60 and the busbar 40 are respectively provided with a heat insulation layer 80, and the heat insulation layer 80 covers the outer surface of the insulating layer 70.

[0133] Combination Figure 4 and Figure 7 As shown, the thickness dimension of the heat insulating layer 80 is D, and the thickness dimension of the insulating layer 70 is d, wherein D>d. The dimension range of the thickness dimension D of the heat insulating layer 80 is 0.5mm≤D≤8mm, and the dimension range of the thickness dimension d of the insulating layer 70 is 0.2mm≤d≤0.5mm. The heat insulating layer 80 includes a PTFE layer and / or an ETFE layer.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery module, characterized in that: include: Multiple battery cells; at least one busbar, the plurality of battery cells being connected via the at least one busbar; A positive output terminal, the positive output terminal being connected to at least one of the battery cells; A negative output terminal, the negative output terminal being connected to at least another one of the battery cells; Among them, the surfaces of the positive output terminal, the negative output terminal and the collector are respectively provided with insulating layers, and at least one of the positive output terminal, the negative output terminal and the collector is also provided with a thermal insulation layer, and the thermal insulation layer is arranged on at least part of the outer surface of the insulating layer, or the thermal insulation layer and the insulating layer are an integrated insulating layer.

2. The battery module according to claim 1, characterized in that: The heat insulation layer is arranged on the outer surface of the insulating layer, and the thickness dimension of the heat insulation layer is D, and the thickness dimension of the insulating layer is d, wherein D>d.

3. The battery module according to claim 2, characterized in that: The thickness dimension D of the thermal insulation layer is in the range of 0.5 mm ≤ D ≤ 8 mm, and / or the thickness dimension d of the insulating layer is in the range of 0.2 mm ≤ d ≤ 0.5 mm.

4. The battery module according to claim 2, characterized in that: The heat insulation layer comprises a film-like structure or a gel-like structure.

5. The battery module according to claim 4, characterized in that: The heat insulation layer includes a PTFE layer and / or an ETFE layer.

6. The battery module according to claim 2, characterized in that: The heat insulation layer comprises a non-metallic porous material layer.

7. The battery module according to claim 6, characterized in that: The non-metallic porous material layer includes a boride ceramic layer.

8. The battery module according to claim 1, characterized in that: The heat-insulating layer and the insulating layer are an integrated insulating heat-insulating layer, the insulating heat-insulating layer is configured to have a minimum heat-resistant temperature of 300° C., and the insulating heat-insulating layer is configured to have a minimum resistance value of 10 MΩ / m.

9. The battery module according to claim 8, characterized in that: The insulating and heat-insulating layer includes a polyimide layer.

10. The battery module according to any one of claims 1 to 9, characterized in that: The battery cell includes a first surface with the largest area, and at least some of the battery cells are arranged along a first direction, the first direction is perpendicular or parallel to the first surface, and the positive output terminal and the negative output terminal are jointly arranged at the same end of the battery module along the first direction, or the positive output terminal and the negative output terminal are respectively arranged at two ends of the battery module along the first direction.

11. The battery module according to claim 10, characterized in that: The first direction is perpendicular to the first surface, and the positive output terminal and the negative output terminal are arranged at the same end of the battery module along the first direction.

12. The battery module according to claim 11, characterized in that: All of the battery cells in the plurality of battery cells are arranged along the first direction, and all of the battery cells are connected in parallel with each other through the busbar.

13. The battery module according to claim 11, characterized in that: The multiple battery cells include multiple rows of battery cells arranged along the second direction, and the multiple rows of battery cells are connected in series with each other through the busbar. Any row of battery cells includes at least some of the battery cells arranged along the first direction, and the at least some of the battery cells are connected in series with each other through the busbar, wherein the second direction is perpendicular to the first direction.

14. The battery module according to any one of claims 1 to 9, characterized in that: The surface of the positive output terminal, the surface of the negative output terminal and the surface of the current collector are respectively covered with the heat insulation layer.

15. A battery, characterized in that: The invention comprises a battery module according to any one of claims 1 to 14, wherein the battery further comprises a box body, a receiving cavity is formed inside the box body, and the battery module is arranged in the receiving cavity.

16. An electrical equipment, characterized in that: The battery according to claim 15 is used to supply power to the power-consuming device.

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