Pressure relief assembly, battery module, battery pack and power-consuming device

Abstract

A pressure relief assembly comprising:a cooling plate (110) for cooling a battery cell (210), wherein the cooling plate (110) is provided with a pressure relief inlet (112);an insulating assembly (120) connected to the cooling plate (110) and defining a pressure relief cavity (130), wherein the insulating assembly (120) is provided with a pressure relief outlet (1220), wherein the pressure relief inlet (112) is connected to the pressure relief outlet (1220) through the pressure relief cavity (130).

Description

TECHNICAL FIELDThe present invention relates to the technical field of the battery, and more particularly, to a pressure relief assembly, a battery module, a battery pack, and a power consuming device.PRIOR ARTThe battery pack typically includes a housing and a battery module disposed in the housing. The battery module includes a plurality of battery cells, and thermal runaway may occur in the charging and discharging operation of the battery cells due to the high temperature. In the existing technology, when a battery cell is thermally blown, the high temperature generated by the discharged high temperature gases, the electrode sheets of the battery cell, the electrolyte, and other substances propagates to the adjacent battery cells in the battery module and adversely affects all the battery cells in the module, resulting in too high a temperature in the battery pack, which may possibly cause the failures such as continuous thermal blow and short circuit.Therefore, there is an urgent need for a pressure relief assembly, a battery module, a battery pack, and a power consuming apparatus to solve the above-described problem in the related art.DISCLOSURE OF UTILITY MODELA purpose of the present invention is to provide a pressure relief assembly, a battery module, a battery pack, and a power consuming device that can cool the thermal runaway spout to prevent the high temperature generated by the thermal runaway spout from spreading to the adjacent battery cell, which avoids the failures such as continuous thermal runaway and short circuit and improves safety and reliability of use.In order to achieve the above purpose, the present invention uses the following technical solution:In a first aspect, there is provided a pressure relief assembly comprising:a cooling plate for cooling a battery cell, the cooling plate being provided with a pressure relief inlet;an insulation assembly connected to the cooling plate and defining a pressure relief cavity, the insulation assembly provided with a pressure relief outlet, the pressure relief inlet connected to the pressure relief outlet through the pressure relief cavity.In a preferred embodiment of the pressure relief assembly provided by the present utility model, the isolation assembly comprises:a heat insulating plate for insulating the pressure relief cavity from the outside, wherein the heat insulating plate and the cooling plate are spaced apart from each other, and wherein the pressure relief cavity is formed between the heat insulating plate and the cooling plate.In a preferred embodiment of the pressure relief assembly provided by the present invention, the heat insulating plate and / or the cooling plate is provided with a support member supported between the heat insulating plate and the cooling plate.In a preferred embodiment of the pressure relief assembly provided by the present utility model, it further comprises:a sealing member sealingly connected between the cooling plate and the heat insulating plate, wherein the cooling plate, the heat insulating plate and the sealing member enclose the pressure relief cavity, and wherein the pressure relief outlet is provided on the heat insulating plate or the sealing member.In a preferred embodiment of the pressure relief assembly provided by the present utility model, the cooling plate and the sealing element and / or the heat insulating plate and the sealing element are glued or welded.In a preferred embodiment of the pressure relief assembly provided by the present invention, the pressure relief outlet is located at the lowest point of the pressure relief cavity; the pressure relief inlet being located higher than the pressure relief outlet.In a preferred embodiment of the pressure relief assembly provided by the present invention, a channel protrusion protrudes from a side of the cooling plate facing the insulation assembly.In a preferred embodiment of the pressure relief assembly provided by the present invention, the cooling plate comprises a flat plate and a channel plate which engage one another, wherein the channel plate is located between the flat plate and the insulation assembly, and wherein the channel protrusion protrudes from a side of the channel plate facing away from the flat plate, and wherein the channel protrusion forms a channel slot on a side facing the flat plate.In a second aspect, a battery module is provided, comprising at least one battery cell and a pressure relief assembly described above, wherein a pressure relief structure is arranged on the battery cell, said pressure relief structure being connected to the pressure relief inlet.In a preferred embodiment of the battery module provided by the present utility model, the battery cell is provided in a number of more than 1, wherein the orientation of the pressure relief structure of the plurality of battery cells is provided facing away along the X direction, wherein the pressure relief assemblies are provided in a number of at least 2, and wherein the at least 2 pressure relief assemblies are each arranged on two sides of the plurality of battery cells along the X direction.In a preferred embodiment of the battery module provided by the present utility model, the battery module further comprises an elastic tube connecting the cooling plates of two of the pressure relief assemblies, wherein the elastic tube can be deformed to conform to the assembly tolerance of the pressure relief assemblies.In a preferred embodiment of the battery module provided by the present invention, the plurality of battery cells are arranged side by side to form a first battery cell unit, the plurality of battery cells are arranged side by side to form a second battery cell unit, the orientations of the pressure relief structure of the first battery cell unit and the pressure relief structure of the second battery cell unit are opposite, and a plurality of first battery cell units and second battery cell units are arranged alternately; two of the pressure relief assemblies each have a plurality of pressure relief inlets; a plurality of pressure relief inlets of one of the pressure relief assemblies is directly opposite the plurality of first battery cell units, while a plurality of pressure relief inlets of the other pressure relief assembly is directly opposite the plurality of second battery cell units.In a preferred embodiment of the battery pack provided by the present utility model, the X direction and the bottom plate of a battery pack enclose an angle α, wherein the value of α is in the range of 0 to 15°.In a preferred embodiment of the battery module provided by the present invention, the battery cell is a cylindrical battery cell, wherein two of the pressure relief assemblies are respectively located at two ends of the cylindrical battery cell along the axial direction.In a preferred embodiment of the battery module provided by the present utility model, the battery module further comprises a busbar unit used for electrical connection to the battery cells; wherein the cooling plate is located on a side of the busbar unit facing away from the battery cells, wherein the cooling plate is in direct or indirect contact with the busbar unit.In a preferred embodiment of the battery module provided by the present utility model, an end of the battery cell is provided with an electrode portion, wherein the electrode portion and the pressure relief structure are located at the same end of the battery cell, and wherein the bus bar unit comprises:a bus bar comprising a conductive portion and a first connection portion connected to each other, the first connection portion being electrically connected to the electrode portion;an insulating heat insulating portion comprising a first insulating heat insulating film, the first insulating heat insulating film being laid on a battery cell facing side of the conductive portion and opposing the pressure relief structure, the pressure relief structure being separated from the conductive portion by the first insulating heat insulating film.In a preferred embodiment of the battery module provided by the present utility model, the insulating, heat-insulating section further comprises a second insulating, heat-insulating film which is laid on a side of the conductive section facing away from the battery cell.In a preferred embodiment of the battery module provided by the present invention, the insulating heat insulating portion further comprises a connection sheet, wherein the first insulating heat insulating sheet and the second insulating heat insulating sheet are connected to each other by the connection sheet, and wherein the connection sheet is laid on the side edge of the conductive portion.In a preferred embodiment of the battery module provided by the present utility model, the first insulating heat insulating sheet and / or the second insulating heat insulating sheet and / or the connection sheet is bonded to the conductive portion.In a preferred embodiment of the battery module provided by the present utility model, the first insulating heat insulating film and / or the second insulating heat insulating film and / or the connection film are a PI film or a mica paper film.In a preferred embodiment of the battery module provided by the present utility model, the thickness of the first insulating heat insulating sheet and / or the second insulating heat insulating sheet and / or the connection sheet is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.In a preferred embodiment of the battery module provided by the present utility model, the electrode region is of circular configuration, wherein a first curved edge (a) is arranged on one side of the first insulating heat-insulating film and / or of the second insulating heat-insulating film, said first curved edge being arranged around the electrode region.In a preferred embodiment of the battery module provided by the present utility model, the battery module further comprises:a holder, wherein the busbar unit is installed on the holder, and wherein a post-forming portion adapted to the battery cell is arranged on the holder, wherein the battery cell cooperates with the post-forming portion.In a preferred embodiment of the battery module provided by the present utility model, the busbar unit and the holder are arranged on the two sides of the battery cell, respectively.In a third aspect, there is provided a battery pack comprising a housing and at least one battery module described above, wherein the battery module is arranged in the housing; and wherein a pressure relief valve of the battery pack is arranged on the housing, said pressure relief valve being connected to the pressure relief outlet.In a fourth aspect, there is provided a power consumption apparatus comprising a power consumption component and a battery pack described above, wherein the battery pack is used to supply the power consumption component with electric power.The present invention has the following advantages:The present invention provides a pressure relief assembly and a battery module including the pressure relief assembly. In the pressure relief assembly, the cooling plate not only plays the role of thermal management of the battery cells, but also encloses a pressure relief cavity along with the isolation assembly. When the battery cell undergoes thermal runaway, the ejection ejected from the inside of the battery cell through the pressure relief structure, such as the high temperature gases, the electrode sheets of the battery cell, the electrolyte, etc., enters the pressure relief cavity through the pressure relief inlet on the cooling plate. Then, the discharge in the pressure relief cavity is discharged to the outside of the battery module through the pressure relief outlet to prevent the battery cell upon thermal runaway from discharging the discharge of the thermal runaway to the adjacent battery cell in the battery module. Further, a pressure relief passage of the battery module is formed by the cooling plate to cool the thermal runaway ejection of the battery cell, thereby reducing the temperature of the ejection ejected upon thermal runaway of the battery pack to prevent the high temperature generated by the thermal runaway ejection from spreading to the extent of avoiding the failures such as continuous thermal runaway and short circuit, and improving the safety and reliability of the use of the battery module.The present utility model further provides a battery pack, wherein a pressure relief valve of the battery pack disposed on the case is connected to the pressure relief outlet of the pressure relief assembly in the case, and the thermal runaway ejection of the battery cell enters the pressure relief cavity through the pressure relief inlet and is discharged to the position of the pressure relief valve of the entire pack through the pressure relief outlet, and thus discharged to the outside of the battery pack through the pressure relief valve of the entire pack, whereby the thermal runaway battery cell can be prevented from ejecting the ejection to other battery cells, other battery modules, and other parts in the battery pack, and by the contact with the cooling plate, the temperature of the thermal runaway ejection can be reduced to avoid the failures such as continuous thermal runaway and short circuit, thus, the thermal safety of the battery pack is significantly improved.The power-consuming apparatus provided by the present invention can prevent thermal runaway of the battery pack from causing dangerous accidents, thereby achieving better safety of use.ILLUSTRATION OF UTILITY MODELIn order to more clearly explain the technical solution in the embodiments of the present invention, the drawings to be used in the explanation of the embodiments of the present invention will be briefly presented below. Obviously, the accompanying drawings described below show only some embodiments of the present invention. Those skilled in the art can obtain other drawings on the basis of the accompanying drawings, provided that no curative work is done. FIG. 1 is a schematic diagram showing the structure of a battery module provided by a specific embodiment of the present invention; FIG. 2 is a schematic diagram showing the disassembly of a battery module provided by a specific embodiment of the present invention; FIG. 3 shows a first view of the two pressure relief assemblies of a battery module provided by a specific embodiment of the present utility model; FIG. 4 is a schematic diagram of the disassembly of a pressure relief assembly provided by a specific embodiment of the present invention; FIG. 5 shows a second view of the two pressure relief assemblies of a battery module provided by a specific embodiment of the present utility model; FIG. 6 is a first view of a battery cell provided by a specific embodiment of the present invention; FIG. 7 is a second view of a battery cell provided by a specific embodiment of the present invention; FIG. 8 is a schematic diagram showing the disassembly of a cooling plate provided by a specific embodiment of the present invention; FIG. 9 shows a schematic diagram of refrigerant flow in the cooling plate in a pressure relief assembly provided by a specific embodiment of the present utility model; FIG. 10 shows a schematic diagram of refrigerant flow in the cooling plate in another pressure relief assembly provided by a specific embodiment of the present utility model; FIG. 11 is a schematic diagram showing the structure of a battery module provided by a specific embodiment of the present invention; FIG. 12 shows a first view of a battery cell module and two CCS assemblies provided by a specific embodiment of the present utility model; FIG. 13 shows a second view of a battery cell module and two CCS assemblies provided by a specific embodiment of the present invention; FIG. 14 is a schematic diagram showing the structure of a battery cell module provided by a specific embodiment of the present invention; FIG. 15 is a schematic diagram showing the disassembly of a bus bar unit and a battery cell provided by a specific embodiment of the present invention; FIG. 16 is a schematic diagram showing the disassembly of a bus bar unit provided by a specific embodiment of the present invention; FIG. 17 is a schematic diagram of a bus bar provided by a specific embodiment of the present invention; FIG. 18 is a first schematic diagram of the connection between a bus bar unit and a battery cell provided by a specific embodiment of the present invention; FIG. 19 is a second schematic diagram of the connection between a bus bar unit and a battery cell provided by a specific embodiment of the present invention; FIG. 20 is a schematic diagram of the connection between a bus bar unit and a battery cell module provided by a specific embodiment of the present invention; FIG. 21 is a schematic diagram showing the structure of a holder of a CCS assembly provided by a specific embodiment of the present invention.List of reference characters100 Pressure relief assembly 200 battery cell module 300 first connection pipe 400 second connection pipe 500 CCS assembly 110 cooling plate 120 insulating assembly 130 pressure relief cavity 140 support member 150 first pipe terminal 160 second pipe terminal 170 third pipe terminal 180 fourth pipe terminal 111 refrigerant passage 112 pressure relief inlet 113 flat plate 114 passage plate 1140 passage protrusion 1141 passage slit 115 refrigerant inlet 116 refrigerant outlet 121 heat insulating plate 122 sealing member 1220 pressure relief outlet 210 battery cell 211 pressure relief structure 212 electrode portion 213 cathode portion 214 cathode end surface 215 cylindrical side surface 510 bracket 520 bus bar unit 530 detection unit 511 post-molding portion 512 bus bar slot 521 bus bar 522 insulating, Heat insulating portion 5211 Conductive portion 5212 First connection portion 5213 Second connection portion 5214 Positioning hole 5221 First insulating heat insulating sheet 5222 Second insulating heat insulating sheet 5223 Connection sheet 5221 a First curved edge 5221 b Second curved edge 531 Detection board 532 Voltage detection strip 533 ConnectorCONCRETE EMBODIMENTSIn conjunction with figures in the embodiments of the present invention, the technical solution in the embodiments of the present invention will be explained clearly below, so that the object, the technical solutions and the advantages of the present invention will become clearer. Obviously, the embodiments described do not represent all embodiments, but only a part of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments in the present invention without any creative works should be considered to be within the scope of the present invention.Unless otherwise stated, all technical and scientific terms used in the present utility model have the same meanings as those ordinarily understood by those skilled in the technical field of the present utility model. The terms used in the specification of the application of the present utility model are only for explaining the specific embodiments, rather than limiting the present utility model; the terms "comprise" and "have", and all variations thereof in the specification and claims of the present utility model and the explanation of the accompanying drawings are intended to cover a non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims, and the accompanying drawings of the present invention are used to distinguish various objects from each other, and are not used to explain a particular sequence or a primary and secondary relationship.The "embodiment" mentioned in the present specification means that the specific features, structures, or characteristics explained in connection with the embodiment can be included in at least one embodiment of the present invention. The occurrence of a phrase at various places throughout the specification does not necessarily refer to the same embodiment or an independent or alternative embodiment that is mutually exclusive with other embodiments.It should be further understood that the terms "installed," "coupled," "connected," "connected" should be understood broadly in the explanation of the present utility model unless there are any unique rules and regulations. For example, it may be both a fixed connection and a detachable connection, or an integrated connection; it may be a direct connection or an indirect connection via a medium; it may also be a connection between the insides of two elements. Those skilled in the art can understand the concrete meanings of the above terms in the present utility model from the concrete situations.The terms "and / or" in the present utility model is only an association relationship describing the related objects, which means that there may be three kinds of relationships, e.g., A and / or B, which may mean these three situations: that A alone exists, A and B simultaneously exists, and B alone exists. Moreover, in the present utility model, the sign " / " generally indicates that the related objects before and after are in an "or" relationship.In the embodiments of the present invention, the same numerals denote the same parts, and detailed description of the same parts is omitted in the various embodiments for convenience. It is to be understood that the dimensions of the thickness, length and width, etc. of the various components in the embodiments of the present invention, as well as the total thickness, length and width, etc. of the integrated device shown in the accompanying drawings are merely exemplary explanations and should not be taken as limiting the present invention.A "plurality" as used in the present invention refers to more than two (including two).The battery cell mentioned in an embodiment of the present invention may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium ion battery cell or a magnesium ion battery cell, etc., which is not limited in the embodiment of the present invention. The battery cell may have the shape of a flat body, a rectangular body, a cylinder, or other shapes, etc., which is not limited in the embodiment of the present invention.The battery module and battery pack mentioned in the embodiments of the present invention are individual physical modules including a plurality of battery cells to provide a higher voltage and capacity. In the case of a battery pack, it generally comprises a housing for encapsulating one or more battery cells, wherein it can be avoided with the housing that liquids or other foreign bodies impair the charging or discharging of the battery cells.An embodiment of the present invention provides a power consumption device, wherein the power consumption device includes a battery pack and a power consumption component, and the battery pack can serve as a power supply system of the power consumption device to supply the power consumption component with electric power, thereby achieving a corresponding function. The power-consuming apparatus may be an electric tool, a battery-powered vehicle, an electric vehicle, a ship, a spacecraft, and the like.The battery pack described in the embodiment of the present invention is applicable not only to the above-mentioned power consuming apparatus but also to all other power consuming apparatuses using batteries. However, for convenience, the following embodiments will be illustrated with reference to a vehicle as an example of a power-operated device.The vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new-energy vehicle, and the new-energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a REEV vehicle, etc. The vehicle is provided with a battery pack inside, and the battery pack may be provided at the bottom or head or rear of the vehicle. The battery pack may be used for the power supply of the vehicle. For example, the battery pack may be used as a power source for the operation of the vehicle. The vehicle may also include a controller and a motor, the controller being used to control the battery pack to supply power to the motor, e.g., for starting, navigating, and requiring working power of the vehicle while driving.An embodiment of the present invention provides a battery pack used in a power-consuming apparatus such as a vehicle described above, wherein the cost for using the power-consuming apparatus is lower and the production efficiency is higher. The battery pack includes a housing and at least one battery module, wherein the battery module is disposed inside the housing. The housing is used to provide a receiving space for the battery module. By way of example, the housing can comprise a first housing and a second housing which engage in one another, wherein the connection between the first housing and the second housing can be a screw connection or a welded connection.A pressure relief valve of the entire pack is arranged on the housing of the battery pack. When a battery cell passes thermally, the discharge in the battery cell can be discharged through the pressure relief valve of the entire pack, whereby good safety is achieved.As illustrated in FIGS. 1 and 2, the present embodiment provides a battery module including a battery cell 210 and a pressure relief assembly 100, wherein the battery cell 210 is provided in a number of at least 1. The pressure relief assembly 100 is used to provide a pressure relief channel for the ejection ejected upon thermal passage of the battery cell 210 to drain the high temperature ejection to the exterior of the battery pack.By way of example, a plurality of battery cells 210 are arranged to form a battery cell module 200.Referring now to FIGS. 3, 4 and 5, there is shown a schematic diagram of the structure of a pressure relief assembly 100 provided by the present embodiment. The pressure relief assembly 100 includes a cooling plate 110 and an isolation assembly 120.In this case, the cooling plate 110 is in direct or indirect contact with the battery cell 210 in order to cool the battery cell 210, wherein the insulation assembly 120 is located on a side of the cooling plate 110 facing away from the battery cell 210. The cooling plate 110 may use liquid cooling, air cooling, or direct cooling to cool the battery cell 210. By way of example, the cooling plate 110 is provided with a refrigerant channel 111. The refrigerant passage 111 is used to circulate a coolant medium to cool the battery cell 210, and the coolant medium may be a liquid such as water, brine, or liquid nitrogen, or a gas such as cold air or ammonia as long as it is capable of flowing inside the refrigerant passage 111 to achieve cooling of the battery cell 210.The cooling plate 110 is provided with a pressure relief inlet 112, and the high temperature substances discharged upon thermal passage of the battery cell 210 may enter the pressure relief inlet 112. The isolation assembly 120 is connected to the cooling plate 110 and defines a pressure relief cavity 130, the isolation assembly 120 being provided with a pressure relief outlet 1220, the pressure relief inlet 112 being connected to the pressure relief outlet 1220 through the pressure relief cavity 130. The insulation assembly 120 has a function of insulating the high temperature ejector to prevent the ejector from being injected onto other components in the battery pack.FIGS. 6 and 7 show a schematic diagram of the structure of a cylindrical battery cell 210, wherein a pressure relief structure 211 is arranged on the battery cell 210, which pressure relief structure lies directly opposite the pressure relief inlet 112 on the cooling plate 110 and is connected thereto. Specifically, the battery cell 210 has a pressure release end surface and a cathode end surface 214 that are disposed opposite to each other, the pressure release end surface being provided with a pole column, and the pressure release structure 211 being also disposed in a region where the pressure release end surface is located. Between the pressure relief end surface and the cathode end surface 214 is a cylindrical side surface of the battery cell 210. The pressure relief end surface and the cathode end surface 214 are also generally referred to as the top and bottom of the battery cell 210.In other embodiments, the battery cell 210 may be a square battery cell or another shaped battery cell, as long as it is ensured that the pressure relief structure 211 on that battery cell 210 lies directly opposite and is connected to the pressure relief inlet 112 on the cooling plate 110.In some embodiments, as shown in FIGS. 3 and 5, the isolation assembly 120 and the cooling plate 110 are covered to define the above pressure relief cavity 130. In the pressure relief assembly 100, the cooling plate 110 not only plays the role of thermally managing the battery cells 210, but also encloses a pressure relief cavity 130 along with the isolation assembly 120. When the battery cell 210 undergoes thermal runaway, the ejection ejected from the inside of the battery cell 210 through the pressure relief structure 211, such as the high temperature gases, the electrode sheets of the battery cell, the electrolyte, etc., enters the pressure relief cavity 130 through the pressure relief inlet 112 on the cooling plate 110. Then, the discharge in the pressure relief cavity 130 is discharged to the outside of the battery module through the pressure relief outlet 1220 to prevent the battery cell 210 upon thermal runaway from discharging the discharge of the thermal runaway to the adjacent battery cell 210 in the battery module. Further, a pressure relief passage of the battery module is formed by the cooling plate 110 to cool the thermal runaway ejection of the battery cell, thereby reducing the temperature of the ejection ejected upon thermal runaway of the battery pack to prevent the high temperature generated by the thermal runaway ejection from spreading to the extent of avoiding the failures such as continuous thermal runaway and short circuit, and improving the safety and reliability of the use of the battery module.In some other embodiments, the isolation assembly 120 may also be disposed within the cooling plate 110. In doing so, the isolation assembly 120 itself encloses a above pressure relief cavity 130 inside the cooling plate 110. In the embodiment, the insulation assembly 120 has a certain thermal conductivity. When the thermal runaway ejection enters the pressure relief cavity 130 enclosed by the insulation assembly 120, the insulation assembly 120 transfers the high temperature generated by the thermal runaway ejection to the cooling plate 110 connected to the insulation assembly 120. Thereby, it can also be realized that the cooling plate 110 cools the thermal runaway ejection.In the battery pack provided by the present embodiment, a pressure relief valve of the battery pack disposed on the case is connected to the pressure relief outlet 1220 of the pressure relief assembly 100 in the case, and the thermal runaway ejection of the battery cell 210 enters the pressure relief cavity 130 through the pressure relief inlet 112 and is discharged to the position of the pressure relief valve of the entire pack through the pressure relief outlet 1220, and thus discharged to the outside of the battery pack through the pressure relief valve of the entire pack, whereby the thermal runaway battery cell 210 can be prevented from ejecting to other battery cells 210, other battery modules, and other parts in the battery pack, and the temperature of the thermal runaway ejection can be reduced through the contact with the cooling plate 110, Therefore, in order to prevent the failures such as continuous thermal runaway and short-circuit, the thermal safety of the battery pack is significantly improved. The power consumption apparatus having the above battery pack can prevent thermal runaway of the battery pack from causing dangerous accidents, thereby achieving better safety of use.In the present embodiment, the pressure relief outlet 1220 is at the lowest point of the pressure relief cavity 130, so that the high temperature ejection in the pressure relief cavity 130 can flow out through the pressure relief outlet 1220 under the action of its own gravity to prevent the high temperature ejection from remaining in the pressure relief cavity 130.In other embodiments, the pressure relief outlet 1220 may not necessarily be located at the lowest point of the pressure relief cavity, as long as a corresponding channel is located in the battery pack to discharge the high temperature ejection discharged from the pressure relief outlet 1220.In the present embodiment, the pressure relief inlet 112 is located higher than the pressure relief outlet 1220, so that the high temperature ejection forms a top-down flow tendency. Further, the high temperature ejection in the pressure relief cavity 130 may be prevented from flowing back to the position of the pressure relief inlet 112 to prevent damage to the battery cell module 200.In some embodiments, as shown in FIGS. 3, 4, and 5, the insulation assembly 120 includes a heat insulating plate 121 and a sealing member 122, wherein the heat insulating plate 121 and the cooling plate 110 are spaced apart from each other to insulate the pressure relief cavity 130 from the outside environment, wherein the sealing member 122 is disposed around the heat insulating plate 121, and wherein the sealing member 122 is sealingly connected between the cooling plate 110 and the heat insulating plate 121 such that the cooling plate 110, the heat insulating plate 121, and the sealing member 122 enclose the above pressure relief cavity 130. With this structure, it can be ensured that a pressure relief cavity 130 having a certain thickness is formed, and with the arrangement of the seal member 122, better tightness of the pressure relief cavity 130 in the circumferential direction can be ensured, so that the high temperature ejection can be discharged only through the pressure relief outlet 1220 and cannot escape through the gap between the heat insulating plate 121 and the seal member 122, as well as the gap between the cooling plate 110 and the seal member 122.The heat insulating plate 121 and the sealing member 122 may be formed integrally or separately.The pressure relief outlet 1220 is disposed on the heat insulating plate 121 or the sealing member 122. When the battery module includes only one pressure relief assembly 100 and the pressure relief assembly 100 is horizontally disposed so that the heat insulating plate 121 is located at the lowermost part of the entire battery module, the pressure relief outlet 1220 may be provided on the heat insulating plate 121 so that the high temperature ejection is discharged through the pressure relief outlet 1220 located at the lowermost part under the action of its own gravity. When the pressure relief assembly 100 is vertically disposed, as shown in FIG. 4, the pressure relief outlet 1220 may be provided at a lowermost position of the sealing member 122, so that the high temperature ejection is discharged under the action of its own gravity through the pressure relief outlet 1220 located at the lowermost part of the sealing member 122.In other exemplary embodiments, it is of course also possible for the insulation assembly 120 to comprise only one heat-insulating plate 121, without a sealing element 122 being provided. Here, the above pressure relief cavity 130 may be defined by the heat insulating plate 121 and the cooling plate 110.As illustrated in FIG. 4, in some embodiments, the heat insulating plate 121 and / or the cooling plate 110 is provided with a support member 140 supported between the heat insulating plate 121 and the cooling plate 110 so that the heat insulating plate 121 and the cooling plate 110 are kept spaced apart from each other to form a pressure relief cavity 130 having a certain space. At the same time, with the arrangement of the support member 140, the strength of the entire pressure relief assembly 100, particularly, the compressive strength of the heat insulating plate 121 and the cooling plate 110 can be improved to prevent deformation of the cooling plate 110 and the heat insulating plate 121.The support member 140 is, for example, a support column provided on the heat insulating plate 121 or the cooling plate 110, and the cross section of the support column may be circular, square, or other shape. The support members 140 may be provided in a number of more than 1 and distributed at the center and both ends of the cooling plate 110 to improve the uniformity of support.In some embodiments, the material of the heat insulating plate 121 is a metal, such as an aluminum material, an aluminum alloy material, a stainless steel material, a copper material, a copper alloy material, etc., that has high strength and good heat insulating ability, and can effectively withstand the high temperature ejection, and can block the high temperature inside the pressure relief cavity 130 to prevent the temperature from spreading to the other battery modules and electronic components in the battery pack.In some embodiments, the material of the heat insulating plate 121 may also be plastic, for example, a PBT plastic plate having high strength and good heat insulating ability.In some embodiments, the material of the heat insulating plate 121 may also be rubber, particularly hard rubber, which has excellent heat insulating properties while ensuring high strength.Also, the material of the sealing member 122 may be metal, plastic, or rubber. The sealing member 122 is made of, for example, aluminum, an aluminum alloy, stainless steel, copper, a copper alloy, PBT, or hard rubber, which has high strength and good heat insulating ability and can prevent it from being broken during pressure relief upon thermal runaway to improve safety of use.In the present embodiment, the seal member 122 is a rubber ring that can ensure the sealing of the connection between the heat insulating plate 121 and the cooling plate 110 while having some anti-vibration and anti-shock effect to prevent the connection between the heat insulating plate 121 and the cooling plate 110 from being released.The material of the cooling plate 110 may be aluminum, an aluminum alloy, stainless steel, copper, or a copper alloy, which has high strength and good thermal conductivity and may increase the cooling speed of the battery cell 210.For example, if the sealing member 122, the cooling plate 110, and the heat insulating plate 121 are all made of metal, the connection between the cooling plate 110 and the sealing member 122, and between the heat insulating plate 121 and the sealing member 122, may be a welded connection or an adhesive connection implemented by, for example, a strong adhesive. If the sealing element 122 and / or the heat insulating plate 121 is made of plastic or rubber, the connection between the cooling plate 110 and the sealing element 122, as well as between the heat insulating plate 121 and the sealing element 122, may be an adhesive connection, which is realized, for example, by means of a strong adhesive.In some embodiments, a heat insulating layer may be laid on both sides of the heat insulating plate to further improve its heat insulating ability. The heat-insulating layer is, for example, a heat-insulating layer made of a silicate fiber material.As shown in FIG. 4, a channel protrusion 1140 protrudes from a side of the cooling plate 110 facing the isolation assembly 120. With the arrangement of the channel protrusion 1140, the area of the cooling plate 110 can be increased to increase the contact area between the thermal runaway ejection and the cooling plate 110 and to improve the heat dissipation effect of the thermal runaway ejection. Further, the channel protrusion 1140 may improve the strength of the cooling plate 110. At the same time, the channel protrusion 1140 may play a certain supporting function to prevent the heat insulating plate 121 from being deformed greatly toward the cooling plate 110.The arrangement of the channel protrusion 1140 has a certain swirling effect on the high temperature ejection in the pressure relief cavity 130 to increase the flow roughness of the high temperature ejection and to extend the flow time in the pressure relief cavity 130, so that the contact time between the high temperature ejection and the cooling plate 110 is extended, which is conducive to improving the cooling effect on the high temperature ejection.As illustrated in FIG. 8, in the present embodiment, the cooling plate 110 includes an interlocked flat plate 113 and channel plate 114 that are interlocked, the channel protrusion 1140 is disposed on the channel plate 114, and the channel protrusion 1140 forms a channel slot 1141 on a side facing the flat plate 113. The slit wall of the channel slit 1141 and the flat plate 113 enclose the above refrigerant channel 111. Namely, the channel plate 114 is a concave convex plate structure. For example, a channel protrusion 1140 is formed by a punching process, and the channel slot 1141 is formed on the back side of the channel protrusion 1140. The channel plate 114 is disposed between the flat plate 113 and the insulation assembly 120 such that the flat plate 113 of the cooling plate 110 faces outward, and the flat plate 113 is in direct contact with the battery cell module 200 or in indirect contact with the battery cell module by a heat conductive medium, etc., to ensure a larger contact heat exchange area with the battery cell module 200 and improve the heat exchange effect. Moreover, the flat plate 113 fits well to the battery cell module 200 to avoid the presence of a gap and ensure that the high temperature substances ejected from the battery cells 210 through the pressure relief structure 211 can all enter the pressure relief cavity 130 through the pressure relief inlet 112 and do not exit through the gap between the cooling plate 110 and the battery cell module 200.As illustrated in FIGS. 4, 9, and 10, a refrigerant inlet 115 and a refrigerant outlet 116 are provided on the cooling plate 110, and the refrigerant inlet 115 is connected to the refrigerant outlet 116 through the refrigerant passage 111. The refrigerant medium enters the refrigerant passage 111 through the refrigerant inlet 115 and then flows out through the refrigerant outlet 116 to realize a circulating flow of the refrigerant medium in the refrigerant passage 111. The refrigerant inlet 115 and the refrigerant outlet 116 are each used to connect a corresponding refrigerant line, and the refrigerant inlet 115 and the refrigerant outlet 116 are located at the same end of the cooling plate 110. Thus, the refrigerant line may be disposed at one end of the cooling plate 110. Therefore, it is feasible to provide a space for installing the refrigerant line only on one side of the cooling plate 110 to achieve the purpose of reducing the dimensions of the cooling plate 110 and the entire battery module.As illustrated in FIGS. 9 and 10, the flow direction of the refrigerant medium in the refrigerant passage 111 of the cooling plate 110 is illustrated by arrows.For convenience, the X direction, Y direction, and Z direction are introduced for illustration. In the present embodiment, for example, the battery cell 210 is a cylindrical battery cell, the X direction is the axial direction of the battery cell 210 and the X direction, the Y direction, and the Z direction are perpendicular to each other, and a plurality of battery cells 210 are arrayed along each of the Y direction and the Z direction to form the battery cell module 200. Of course, the battery cell 210 may also be a square battery cell.In some embodiments, the pole columns of all battery cells 210 of the battery cell module 200 are aligned to one side. Namely, the pressure relief structure 211 is directed to one side. Here, it is possible to arrange a pressure relief assembly 100 only on one side of the battery cell module 200 (namely a side on which the pressure relief end face is located), and the pressure relief structure 211 on each battery cell 210 is respectively located directly opposite the pressure relief inlet 112 on the pressure relief assembly 100. It is possible to arrange only one cooling plate 110 on a side on which the cathode end surface 214 of the battery cell module 200 is located.In some embodiments, as shown in FIGS. 2 and 12, the orientations of the pressure relief structures 211 of the plurality of battery cells 210 in the battery cell module 200 are opposite. Namely, the pressure relief structure 211 of a part of the battery cells 210 is aligned to one side, and the pressure relief structure 211 of another part of the battery cells 210 is aligned to another side. The pressure relief assemblies 100 are provided in a number of 2, wherein the two pressure relief assemblies 100 are arranged on two sides of the plurality of battery cells 210 along the X-direction to provide a pressure relief channel for the pressure relief structure 211 on the corresponding side, such that the ejection can be discharged through the pressure relief outlet 1220 of the pressure relief assembly 100 on the corresponding side when all battery cells 210 pass thermally.In other words, when the pressure relief structures 211 of a plurality of cylindrical battery cells have different orientations, the two pressure relief assemblies 100 are respectively located at two ends of the cylindrical battery cell along the axial direction, so that the high temperature ejection ejected from the pressure relief structures 211 on the two sides can be discharged through the corresponding pressure relief assembly 100, respectively.In the battery module in some other embodiments, the number of the pressure relief assemblies 100 may be adjusted as needed. For example, a pressure relief assembly 100 is disposed on a side of the battery cell module 200 provided with the pressure relief structure 211, and here, the number of the pressure relief assemblies 100 is not limited.In the above embodiment, as illustrated in FIGS. 12 and 14, a plurality of battery cells 210 are arranged side by side along the Y direction to form a first battery cell unit, and a plurality of battery cells 210 are arranged side by side along the Y direction to form a second battery cell unit. The orientations of the pressure relief structure 211 of the first battery cell unit and the pressure relief structure 211 of the second battery cell unit are opposite. In particular, in the orientation of FIG. 14, the pressure relief end surface of the first battery cell unit is directed upward and the cathode end surface 214 of the second battery cell unit is directed upward. A plurality of first battery cell units and a plurality of second battery cell units are alternately arranged one after another. In particular, at least one first battery cell unit and at least one second battery cell unit are arranged along the Y direction, wherein the first battery cell unit and the second battery cell unit are distributed alternately one after the other; at least one first battery cell unit and at least one second battery cell unit are arranged along the Z direction, wherein the first battery cell unit and the second battery cell unit are distributed alternately one after the other. Thus, it is realized that in the battery cell module 200, a plurality of battery cells 210 are first connected in parallel and then connected in series.In the two pressure relief assemblies 100, the two pressure relief assemblies 100 each have a plurality of pressure relief inlets 112, wherein a plurality of pressure relief inlets 112 of one pressure relief assembly 100 are directly opposite a plurality of first battery cell units, and wherein the refrigerant passage 111 is directly opposite the second battery cell unit such that the refrigerant medium flows through the cathode end surface 214 of the second battery cell unit for cooling; a plurality of pressure relief inlets 112 of the other pressure relief assembly 100 are directly opposite a plurality of second battery cell units, wherein the refrigerant passage 111 is directly opposite the first battery cell unit such that the refrigerant medium flows through the cathode end surface 214 of the first battery cell unit for cooling.In other words, each respective first battery cell unit on the cooling plate 110 in the pressure relief assembly 100 providing a pressure relief channel for the first battery cell unit is each provided with a pressure relief inlet 112.Namely, a plurality of battery cells 210 in the first battery cell unit commonly use a pressure relief inlet 112 to simplify the manufacturing process and improve the production efficiency.Each respective second battery cell unit on the cooling plate 110 in the pressure relief assembly 100 providing a pressure relief passage for the second battery cell unit is each provided with a pressure relief inlet 112. Namely, a plurality of battery cells 210 in the second battery cell unit commonly use a pressure relief inlet 112 to simplify the manufacturing process and improve the production efficiency.The battery module further includes an elastic tube. The resilient tube is used to connect the cooling plates 110 of the two pressure relief assemblies 100. In the present embodiment, the elastic tube is connected to the refrigerant passage 111 of the cooling plate 110. By using the elastic tube, not only the flow of the refrigerant medium in the two cooling plates 110 is achieved, but also the elasticity of the elastic tube enables elastic deformation to be generated, so that it can absorb the assembly tolerance in stacking the battery cell module and achieve the effect of matching the assembly tolerance of the two pressure relief assemblies 100.As illustrated in FIGS. 1, 2, and 3, the elastic tubes are provided in a number of 2, the two elastic tubes are a first connection tube 300 and a second connection tube 400, respectively, and the first connection tube 300 connects the refrigerant inlets 115 of the cooling plates 110 of the two pressure relief assemblies 100 and the second connection tube 400 connects the refrigerant outlets 116 of the cooling plates 110 of the two pressure relief assemblies 100 to realize the connection of the cooling plates 110 in the two pressure relief assemblies 100, so that the refrigerant medium can be introduced from the inside of one cooling plate 110 to the inside of the other cooling plate 110. In this way, the structure of the pipeline arrangement is saved, the structure is simplified and less space is occupied.As further illustrated in FIGS. 1, 2 and 3, a first pipe joint 150 and a second pipe joint 160 are arranged on the heat insulating plate 121 of a pressure relief assembly 100, wherein the first pipe joint 150 is used to be connected to a liquid inlet pipe for introducing the refrigerant medium, and wherein the second pipe joint 160 is used to be connected to a liquid outlet pipe for discharging the refrigerant medium, and wherein the first pipe joint 150 and the second pipe joint 160 penetrate the heat insulating plate 121 and are connected to the cooling plate 110 in the pressure relief assembly 100. A third pipe connection 170 and a fourth pipe connection 180 are arranged on the cooling plate 110 of the other pressure relief assembly 100, wherein the third pipe connection 170 is connected to the refrigerant inlet 115 of the cooling plate 110 and the fourth pipe connection 180 is connected to the refrigerant outlet 116 of the cooling plate 110. The first pipe connection 150 is connected to the third pipe connection 170 through the first connecting pipe 300, and the second pipe connection 160 is connected to the fourth pipe connection 180 through the second connecting pipe 400 to realize the connection between the cooling plates 110 in the two pressure relief assemblies 100.In some embodiments, the first connection tube 300 and the second connection tube 400 are both bellows. The bellows can effectively compensate for stack tolerances between the battery modules and at the same time ensure the sealing of the connection point between the two cooling plates 110.In the present embodiment, the X direction and the bottom plate of the case of the battery pack enclose an angle α, where α is greater than or equal to 0° and less than or equal to 15°. That is, after the battery module is installed inside the battery pack, an angle of 0 to 15° is formed between the axis of the cylindrical battery cell and the bottom plate of the battery pack, and for example, the angle between the axis of the cylindrical battery cell and the bottom plate of the battery pack is 0° (the two are parallel), 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, and the like. Here, the two pressure relief assemblies 100 are vertically arranged, and the pressure relief outlet 1220 is preferably directed downward, so that the high temperature ejection in the pressure relief cavity 130 can be discharged from the pressure relief outlet 1220 under its own gravity and finally discharged through the pressure relief valve of the battery pack on the case.As illustrated in FIGS. 2 and 11, the battery module further includes a CCS assembly 500 including a bracket 510, a bus bar unit 520, and a detection unit 530. The bus bar unit 520 and the detection unit 530 are each installed on the bracket 510. The bus bar unit 520 is electrically connected to the battery cell 210. For example, electrical conductivity is achieved by welding. The sensing unit 530 is electrically connected to the bus bar unit 520 to sense voltage and temperature signals of the battery cell module 200.As illustrated in FIGS. 12 and 13, on the bracket 510, a post-forming portion 511 that is fitted to the battery cell 210 is disposed, the battery cell 210 and the post-forming portion 511 are fitted to each other to fix the position of the battery cell 210, and the bracket 510 serves as a mounting bracket for the bus bar unit 520 and the detection unit 530, and a bracket for the battery cell module 200, which simplifies the structure of the battery module and greatly improves the production efficiency, and at the same time, the material cost of the battery module is greatly reduced.For example, the post-forming portion 511 is a post-forming hole, and in the arrangement of the battery cell 210, it is sufficient to arrange the battery cell 210 in the post-forming hole.Since the orientations of the pole posts of the plurality of battery cells 210 are opposite, a CCS assembly 500 is disposed on each of the two sides of the battery cell module 200 along the X direction. As shown in FIGS. 12 and 13, a post-forming portion 511 is arranged on the holder 510 of each of the two CCS assemblies 500, the post-forming portions corresponding one-to-one to the battery cells 210. In the stacking process, it is only necessary to arrange the battery cells 210 corresponding to the post-forming portion 511 on the bracket 510 of the CCS assembly 500 to complete the stacking of the battery cell modules 200; after the stacking has been completed, the welding of the bus bar unit 520 in the CCS assembly 500, etc. is performed. Thereafter, the cooling plates 110 in the pressure relief assemblies 100 on the two sides are connected to one side of the corresponding CCS assembly 500, which represents a simple molding process and improves the efficiency of the stacking process.Since a post-molding portion 511 (for example, a post-molding hole in the present embodiment) is disposed on each of the two-side brackets 510 of the CCS assemblies 500, the two-side bracket 510 of the CCS assemblies 500 can directly horizontally support the battery cell 210 without the need to use a tray for limiting a plurality of battery cells 210, which can reduce the use of parts in the battery module mounting process, simplify the battery module mounting process, and reduce the size of the battery module along the X direction, so that the structure of the battery module becomes more compact to reduce the occupied space and improve the energy density.The holder 510 is made of plastic, for example.In the present embodiment, the CCS package 500 is a fully integrated module. That is, the bracket 510, the bus bar unit 520, and the detection unit 530 may be assembled first to form the entire CCS assembly 500, whereby the overall feeding can be achieved and the production stroke can be accelerated.In particular, referring to FIG. 2, the cooling plate 110 of the pressure relief assembly 100 is located on a side of the busbar unit 520 facing away from the battery cell 210, wherein the cooling plate 110 is in direct or indirect contact with the busbar unit 520 to realize the cooling of the busbar unit 520 and the battery cell 210.In some embodiments, a thermally conductive medium is provided between the cooling plate 110 and the bus bar unit 520 to ensure complete contact between the cooling plate 110 and the bus bar unit 520, improve heat exchange efficiency, and realize rapid cooling of the bus bar unit 520 and the battery cell 210. The thermally conductive medium is, for example, a thermally conductive structural adhesive. Since the refrigerant passage 111 is directly opposite to the cathode end surface 214 of the battery cell 210, the cooling position is the cathode of the battery cell, and the heat conduction path is: cooling plate 110→conductor structure adhesive→bus unit 520 on the CCS assembly 500→cathode of the battery cell 210.In FIG. 15, a schematic diagram is a structure diagram of a bus bar unit 520 and a battery cell 210 provided by the present embodiment. In combination with FIG. 6, an end of the battery cell 210 is provided with an electrode portion 212, wherein the electrode portion 212 and the pressure relief structure 211 are located at the same end of the battery cell 210. Namely, one end of the battery cell 210 is simultaneously provided with an electrode portion 212 and a pressure relief structure 211.As illustrated in FIG. 16, the bus bar unit 520 includes a bus bar 521 and an insulating heat insulating portion 522. The bus bar 521 is made of a metal material such as aluminum, an aluminum alloy, copper, a copper alloy, etc. and has a better electric conductivity, and the insulating heat insulating portion 522 may be made of a nonmetallic material having better insulating and heat resistant properties.As illustrated in FIG. 17, the bus bar 521 includes a conductive portion 5211 and a first connection portion 5212 which are connected to each other, the first connection portion 5212 being disposed on one side of the conductive portion 5211. The first connection portion 5212 is electrically connected to the electrode region 212. For example, an electrical connection is achieved by laser welding. As illustrated in FIG. 18, the insulating heat insulating portion 522 includes a first insulating heat insulating sheet 5221, the first insulating heat insulating sheet 5221 being laid on a side of the conductive portion 5211 facing the battery cell 210 and opposing the pressure relief structure 211, the pressure relief structure 211 being separated from the conductive portion 5211 by the first insulating heat insulating sheet 5221.By disposing a first insulating heat insulating sheet 5221 on a side of the conductive portion 5211 of the bus bar 521 facing the battery cell 210, ejection thereof is injected onto the first insulating heat insulating sheet 5221 to prevent the ejection of the thermal ejection from being directly connected to the battery cell 210 and the bus bar 521 and thereby cause a short circuit due to the heat insulating blocking effect of the first insulating heat insulating sheet 5221 upon thermal runaway of the battery cell 210. Further, the high temperature can be prevented from spreading on the bus bar 521 to improve the safety and reliability of the battery pack.By way of example, the electrode region 212 is the anode region or the cathode region 213 of the battery cell 210. In some battery cells 210, one end thereof is provided with only an anode region and a pressure relief structure 211, or provided with only a cathode region 213 and a pressure relief structure 211. In some other battery cells 210, one end thereof is simultaneously provided with an anode region, a cathode region 213, and a pressure relief structure 211. When the first connection portion 5212 of the bus bar 521 is connected to the anode region, the first insulating heat insulating sheet 5221 insulates the cathode region 213 and the conductive portion 5211, and the pressure relief structure 211 and the conductive portion 5211. When the first connection portion 5212 of the bus bar 521 is connected to the cathode region 213, the first insulating heat insulating sheet 5221 insulates the anode region and the conductive portion 5211, and the pressure relief structure 211 and the conductive portion 5211. This prevents the anode region and the cathode region 213 from being electrically connected to the bus bar 521 at the same time, and thus a short-circuit phenomenon occurs. At the same time, the high temperature ejection ejected from the pressure relief structure 211 can be isolated.The battery cell 210 is, for example, a cylindrical battery cell, for example, a cylindrical battery cell of Model 2170. As illustrated in FIG. 6, the both end surfaces of the cylindrical battery cell along the X direction are a pressure release end surface and a cathode end surface 214, respectively. Between the pressure relief end surface and the cathode end surface 214 is a cylindrical side surface 215. The pressure relief end surface is provided with a pole column and a pressure relief structure 211, wherein the pole column is the anode region of the battery cell 210 and the region arranged around the outside of the pole column is a cathode region 213. The cylindrical side surface 215 of the battery cell 210 is also a cathode. When the bus bar unit 520 provided by the present embodiment is connected to the cylindrical battery cell, the first insulating heat insulating sheet 5221 disposed on the bus bar 521 can both insulate the thermal runaway ejection discharged through the pressure relief structure 211 and insulate the anode portion and the cathode portion 213 from each other to prevent the anode and the cathode from being simultaneously connected to the bus bar 521 and thus short-circuit occurs.As illustrated in FIGS. 15 and 19, the insulating heat insulating portion 522 optionally further includes a second insulating heat insulating sheet 5222 laid on a side of the conductive portion 5211 facing away from the battery cell 210. The second insulating heat insulating sheet 5222 may insulate and block thermal runaway ejection of the battery cell 210 from a side of the conductive portion 5211 facing away from the battery cell 210 to prevent the battery cell 210 from being electrically connected to the back side of the bus bar 521 directly by the thermal runaway conductive ejection, thereby avoiding a short circuit phenomenon. Further, the high temperature of thermal runaway can be prevented from spreading to the bus bar 521.As illustrated in FIG. 18, the insulating heat insulating portion 522 further includes a connection sheet 5223, wherein the first insulating heat insulating sheet 5221 and the second insulating heat insulating sheet 5222 are connected to each other on both sides of the conductive portion 5211 by the connection sheet 5223, and wherein the connection sheet 5223 is laid on the side edge of the conductive portion 5211. Namely, the insulating heat insulating portion 522 covers both side surfaces and the edges of the entire conductive portion 5211 to completely prevent the thermal runaway discharge from being directly conductively connected to the bus bar 521. Further, the high temperature generated from the thermal runaway ejection is prevented from spreading on the bus bar 521 to avoid the temperature increase of the bus bar 521 being too high, thereby improving the reliability and reliability of the battery pack.In some embodiments, the first insulating heat insulating film 5221 and / or the second insulating heat insulating film 5222 and / or the connection film 5223 are adhered to the conductive portion 5211, so that the connection is robust, convenient, and reliable. In the present embodiment, the first insulating heat insulating sheet 5221, the second insulating heat insulating sheet 5222, and the connection sheet 5223 are respectively adhered to the conductive portion 5211. For example, the first insulating heat insulating sheet 5221, the second insulating heat insulating sheet 5222, and the joining sheet 5223 are each provided with adhesive. After the entire insulating heat insulating portion 522 is bonded to the conductive portion 5211 of the bus bar 521, a hot pressing method is used to fuse the adhesive to the insulating heat insulating portion 522 by the high temperature, thereby realizing that the insulating heat insulating portion 522 is firmly bonded to the conductive portion 5211 of the bus bar 521.The first insulating heat insulating film 5221 and / or the second insulating heat insulating film 5222 and / or the connection film 5223 are a PI film or a mica paper film. For example, the first insulating heat insulating film 5221, the second insulating heat insulating film 5222, and the joining film 5223 are each a PI film. Namely, the entire insulating heat insulating portion 522 is made of a PI sheet having excellent high temperature resistant properties and electrical insulation properties, in order to effectively block simultaneous electrical connection of the anode region and the cathode region 213 to the bus bar 521 and effectively isolate the thermal runaway ejection. Alternatively, the first insulating heat insulating sheet 5221, the second insulating heat insulating sheet 5222, and the joining sheet 5223 are each a mica paper. Namely, the entire insulating heat insulating portion 522 is made of mica paper which can be used in an environment of 500°C to effectively insulate the thermal runaway ejection and prevent the high temperature propagation. Further, the mica paper has good insulating properties and can insulate the cathode region 213 and the conductive portion 5211, or the anode region and the conductive portion 5211, from each other.In some embodiments, the thickness of the first insulating heat insulating film 5221and / or the second insulating heat insulating film 5222and / or the joining film 5223is greater than or equal to 0.1 mm and less than or equal to 0.5 mm. Further, the thickness of the first insulating heat insulating sheet 5221 and / or the second insulating heat insulating sheet 5222 and / or the joining sheet 5223 may be in a range of greater than or equal to 0.1 mm and less than or equal to 0.3 mm. The insulating heat insulating portion 522 having this thickness dimension can ensure effective insulation of the cathode region 213 (or the anode region) and the conductive portion 5211 to prevent a thin insulating heat insulating portion from being broken and destroyed under the effect of the discharge pressure of the discharge of the thermal runaway of the battery cell 210. At the same time, the insulating heat insulating portion is not too thick, whereby the material cost is not increased. For example, the first connection portion 5212 is connected to the anode region. In a cylindrical battery cell of some models, the anode region and the cathode region 213 are in the same plane. When the first insulating heat insulating sheet 5221 is disposed too thick, a gap exists between the first connecting portion 5212 and the anode region due to the first insulating heat insulating sheet 5221 being clamped between the cathode region 213 and the conductive portion 5211, thereby increasing the difficulties in welding.For example, the first insulating heat insulating film 5221, the second insulating heat insulating film 5222, and the joining film 5223have the same thickness, which may be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, and the like.In some embodiments, the battery cell 210 connected to the bus bar 521 is a cylindrical battery cell as shown in FIGS. 6 and 7. the electrode portion 212 is an anode portion. On the outer periphery of the anode region, a cathode region 213 is disposed surroundingly, and the cathode region 213 and the anode region are located on the same end surface of the battery cell 210. The cathode end surface 214 and the anode region of the cylindrical battery cell are arranged at two ends of the cylindrical battery cell along the axial direction of the cylindrical battery cell. As illustrated in FIG. 17, the bus bar 521 further includes a second connection portion 5213, wherein the second connection portion 5213 and the first connection portion 5212 are disposed on two opposite sides of the conductive portion 5211. The bus bar 521 may be connected to two cylindrical battery cells whose orientations are opposite to each other through the first connection portion 5212 and the second connection portion 5213. Here, the first connection portion 5212 is connected to the anode region of one battery cell 210, and the second connection portion 5213 is electrically connected to the cathode end surface 214 of the other battery cell 210.The electrode portion 212 is formed in a circular shape. In the above embodiment, in particular, the anode region of the cylindrical battery cell is formed in a circular shape. As illustrated in FIGS. 18 and 19, on one side of the first insulating heat insulating sheet 5221 and / or the second insulating heat insulating sheet 5222, a first curved edge 5221 aarranged around the electrode portion 212 is disposed. Namely, it is arranged surroundingly on the outside of the anode region. Here, a first curved edge 5221 amay be disposed on a side of each of the first insulating heat insulating sheet 5221 and the second insulating heat insulating sheet 5222. Also, it is applicable that a first curved edge 5221 ais disposed on one of the first insulating heat insulating sheet 5221 and the second insulating heat insulating sheet 5222. The cathode end face 214 is also of circular configuration, wherein a respective second curved edge 5221 bis arranged on a side of the first insulating, heat-insulating film 5221 remote from the first connecting portion 5212 and / or on a side of the second insulating, heat-insulating film 5222 remote from the first connecting portion 5212, said second curved edge being arranged surroundingly on the exterior of the cathode end face 214. Here, a second curved edge 5221 b above may be disposed on each of the first insulating heat insulating sheet 5221 and the second insulating heat insulating sheet 5222. Also, it is applicable that a second curved edge 5221 bis disposed only on one of the first insulating heat insulating sheet 5221 and the second insulating heat insulating sheet 5222. The shape and dimension of the first curved edge 5221 aare matched to the outer contour of the anode region, and the second curved edge 5221 bis matched to the outer contour of the cathode end surface 214. By the first curved edge 5221 asurrounded at the exterior of the anode region and the second curved edge 5221 bsurrounded at the exterior of the cathode end surface 214, the first insulating heat insulating sheet 5221 and the second insulating heat insulating sheet 5222 can cover as much as possible a portion on the bus bar 521 that is not electrically connected to the battery cell 210. Namely, they are laid on the entire conductive portion 5211, so that the bus bar 521 is prevented from being directly contacted with the thermal runaway discharge as much as possible. As illustrated in FIG. 17, the part illustrated by the broken line is the conductive portion 5211, and it is sufficient to arrange the first insulating heat insulating film 5221 and the second insulating heat insulating film 5222 within the range specified by the broken line.As illustrated in FIGS. 19 and 20, a bus bar 521 is capable of connecting two rows of battery cells 210 having different orientations of the pole pillars, and the two rows of battery cells 210 are a first battery cell unit and a second battery cell unit, respectively. The first battery cell unit and the second battery cell unit each include a plurality of battery cells 210 arranged along the Y direction. The first battery cell unit and the second battery cell unit are arranged along the Z direction, and the axis direction of the battery cell 210 is the X direction. Here, the X direction, the Y direction and the Z direction are perpendicular to each other.The orientations of the battery cells 210 in the first battery cell unit and the second battery cell unit are opposite. As illustrated in FIGS. 19 and 20, the first connection portion 5212 and the second connection portion 5213 are respectively disposed on both sides of the conductive portion 5211 along the Z direction, the first connection portions 5212 and the second connection portions 5213 are respectively provided along the Y direction in a number of more than 1, and the plurality of first connection portions 5212 and the plurality of battery cells 210 correspond to the first battery cell unit one-to-one, and the plurality of second connection portions 5213 and the plurality of battery cells 210 correspond to the second battery cell unit one-to-one. The plurality of first connection portions 5212 are connected one-to-one to a plurality of anode regions in the first battery cell unit, respectively, the cathode region 213 in the first battery cell unit and the conductive portion 5211 are insulated from each other by the first insulating heat insulating sheet 5221; and the plurality of second connection portions 5213 are connected one-to-one to a plurality of cathode end surfaces 214 in the second battery cell unit, respectively. The first insulating heat insulating film 5221 and the second insulating heat insulating film 5222 each extend along the Y direction to insulate and block the cathode portion 213 of each battery cell 210 and the bus bar 521 from each other, respectively, and to insulate and block the ejection of thermal runaway of each battery cell 210.An opposite side of the first connecting portion 5212 to the conductive portion 5211 is projected and formed nearly in a circle and is matched to the shape and dimension of the anode region, a recess is formed between two adjacent first connecting portions 5212, and the bottom wall of the recess is the side edge of the conductive portion 5211 covered with the connection sheet 5223. Further, two ends of the first insulating heat insulating sheet 5221 along the Y direction are respectively connected to the second insulating heat insulating sheet 5222 through the connection sheet 5223, so as to cover two sides of the conductive portion 5211 along the Y direction.As illustrated in FIG. 17, a positioning hole 5214 is provided directly at the central position of the second connection portion 5213, and during welding of the second connection portion 5213 to the cathode end surface 214 of the battery cell 210 for realizing conductive connection, the positioning hole 5214 is used for weld identification to ensure that the welding paths are on the provided tracks.As illustrated in FIG. 21, on a side of the bracket 510 opposite to the battery cell 210, a bus bar slot 512 for installing the bus bar unit 520 is provided, and the shape and dimension of the bus bar slot 512 are matched to the shape and dimension of the bus bar 521 to position and fix the bus bar unit 520.When the bus bar 521 is connected only to the cathode end surface 214 and is not connected to the anode region, there is no need to arrange the insulating heat insulating portion 522, like the cathode-output bus bar 521 illustrated in the lower left corner of FIG. 11. When the bus bar 521 is connected only to the anode region and is not connected to the cathode end surface 214, there is no need to arrange the second connecting portion 5213, and it is sufficient to arrange one of the first curved edge 5221 aof the first insulating heat insulating sheet 5221 and the second insulating heat insulating sheet 5222 as a straight edge, like the anode-output bus bar 521 illustrated in the lower right corner of FIG. 11.The bus bar 521 located at the uppermost position in FIG. 11 is a long bus bar connected in series, which is connected to a first battery cell unit and a second battery cell unit arranged along the Y direction. Accordingly, on the bus bar 521, a row of first connection portions 5212 and a row of second connection portions 5213 are arranged, and the one row of first connection portions 5212 and the one row of second connection portions 5213 are arranged along the Y direction. The one row of first connection portions 5212 is connected to the anode region of the first battery cell unit, and the one row of second connection portions 5213 is connected to the cathode region 213 of the second battery cell unit. On the long bus bar connected in series, an insulating heat insulating portion 522 only needs to be disposed in a corresponding region corresponding directly to the first battery cell unit, and there is no need to place an insulating heat insulating portion 522 in a region corresponding directly to the second battery cell unit.As illustrated in FIGS. 11 and 13, the detection unit 530 includes a detection board 531, a voltage detection board 532, and a connector 533, the detection board 531 being, for example, a flexible FPC board to which a plurality of voltage detection boards 532 are connected, the voltage detection board 532 being electrically connected to the bus bar 521 to detect the voltage signals. The connector 533 is electrically connected to one end of the detection board 531 and serves as an output interface for data acquisition.Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention and are not intended to limit the embodiment of the present invention. Those skilled in the art can make various marked changes, resets, and substitutions without departing from the scope of the present invention. It is both unnecessary and impossible to list all exemplary embodiments. All changes, equivalents, and improvements made under the spirit and principles of the present invention should be considered to be within the scope of the claims of the present invention.

Claims

A pressure relief assembly comprising: a cooling plate (110) for cooling a battery cell (210), the cooling plate (110) provided with a pressure relief inlet (112); an isolation assembly (120) connected to the cooling plate (110) and defining a pressure relief cavity (130), the isolation assembly (120) provided with a pressure relief outlet (1220), the pressure relief inlet (112) connected to the pressure relief outlet (1220) through the pressure relief cavity (130).The pressure relief assembly of claim 1, wherein the insulation assembly (120) comprises: a heat insulating plate (121) for insulating the pressure relief cavity (130) from the outside, wherein the heat insulating plate (121) and the cooling plate (110) are spaced apart from each other, and wherein the pressure relief cavity (130) is formed between the heat insulating plate (121) and the cooling plate (110).The pressure relief assembly of claim 2, wherein the heat insulating plate (121) and / or the cooling plate (110) is provided with a support member (140) supported between the heat insulating plate (121) and the cooling plate (110).The pressure relief assembly of claim 2 or 3, further comprising: a sealing member (122) sealingly connected between the cooling plate (110) and the heat insulating plate (121), the cooling plate (110), the heat insulating plate (121), and the sealing member (122) enclosing the pressure relief cavity (130), the pressure relief outlet (1220) provided on the heat insulating plate (121) or the sealing member (122).The pressure relief assembly of claim 4, wherein the cooling plate (110) and the sealing member (122) are bonded or welded, and / or wherein the thermal insulating plate (121) and the sealing member (122) are bonded or welded.The pressure relief assembly of any of claims 1 to 5, wherein the pressure relief outlet (1220) is located at the lowest point of the pressure relief cavity (130), the pressure relief inlet (112) being located higher than the pressure relief outlet (1220).The pressure relief assembly of any of claims 1 to 6, wherein a channel protrusion (1140) protrudes from a side of the cooling plate (110) facing the isolation assembly (120).The pressure relief assembly of claim 7, wherein the cooling plate (110) comprises an interlocking flat plate (113) and channel plate (114), wherein the channel plate (114) is between the flat plate (113) and the isolation assembly (120), wherein the channel protrusion (1140) protrudes from a side of the channel plate (114) opposite the flat plate (113), and wherein the channel protrusion (1140) forms a channel slot (1141) on a side facing the flat plate (113).A battery module comprising at least one battery cell (210) and a pressure relief assembly according to any one of claims 1 to 8, wherein a pressure relief structure (211) connected to the pressure relief inlet (112) is arranged on the battery cell (210).The battery module of claim 9, wherein a plurality of battery cells (210) is provided, wherein the orientation of the pressure relief structure (211) is provided facing away from the plurality of battery cells (210) along the X direction, wherein at least two pressure relief assemblies (100) are provided, wherein the at least two pressure relief assemblies (100) are respectively arranged on two sides of the plurality of battery cells (210) along the X direction.The battery module of claim 10, wherein the battery module further comprises an elastic tube connecting the cooling plates (110) of two pressure relief assemblies (100), wherein the elastic tube can be deformed to conform to an assembly tolerance of the pressure relief assemblies (100).The battery module of claim 10, wherein a plurality of battery cells (210) are arranged side by side to form a first battery cell unit, wherein a plurality of battery cells (210) are arranged side by side to form a second battery cell unit, wherein the orientation of the pressure relief structure (211) of the first battery cell unit and the orientation of the pressure relief structure (211) of the second battery cell unit are opposite, wherein a plurality of first battery cell units and second battery cell units are alternately arranged; wherein two pressure relief assemblies (100) each have a plurality of pressure relief inlets (112); wherein a plurality of pressure relief inlets (112) of one of the pressure relief assemblies (100) is directly opposite the plurality of first battery cell units, while a plurality of pressure relief inlets (112) of the other pressure relief assembly (100) is directly opposite the plurality of second battery cell units.The battery module of claim 12, wherein the X direction and a bottom plate of a battery pack enclose an angle α, wherein the value of α is in the range of 0 to 15°.The battery module according to any one of claims 9 to 13, wherein the battery cell (210) is a cylindrical battery cell, wherein two pressure relief assemblies (100) are respectively located at two ends of the cylindrical battery cell along the axial direction.The battery module according to any one of claims 9 to 14, wherein the battery module further comprises a busbar unit (520) used for electrical connection to the battery cell (210), wherein the cooling plate (110) is located on a side of the busbar unit (520) facing away from the battery cell (210), wherein the cooling plate (110) is in direct or indirect contact with the busbar unit (520).The battery module according to claim 15, wherein an end of the battery cell (210) is provided with an electrode portion (212), the electrode portion (212) and the pressure relief structure (211) are located at the same end of the battery cell (210), the bus bar unit comprising: a bus bar (521) comprising a conductive portion (5211) and a first connection portion (5212) connected to each other, the first connection portion (5212) being electrically connected to the electrode portion (212); an insulating heat insulating portion (522) comprising a first insulating heat insulating sheet (5221), the first insulating heat insulating sheet (5221) being laid on a side of the conductive portion (5211) facing the battery cell (210) and opposing the pressure relief structure (211), the pressure relief structure (211) being separated from the conductive portion (5211) by the first insulating heat insulating sheet (5221).The battery module of claim 16, wherein the insulating heat insulating portion (522) further comprises a second insulating heat insulating sheet (5222) laid on a side of the conductive portion (5211) facing away from the battery cell (210).The battery module according to claim 17, wherein the insulating heat insulating portion (522) further comprises a connection sheet (5223), wherein the first insulating heat insulating sheet (5221) and the second insulating heat insulating sheet (5222) are connected to each other through the connection sheet (5223), wherein the connection sheet (5223) is laid on a side edge of the conductive portion (5211).The battery module according to claim 18, wherein the first insulating heat insulating sheet (5221) and / or the second insulating heat insulating sheet (5222) and / or the connection sheet (5223) is bonded to the conductive portion (5211).The battery module according to claim 18 or 19, wherein the first insulating heat insulating film (5221) and / or the second insulating heat insulating film (5222) and / or the connection film (5223) is a polyimide film or a mica paper film.The battery module according to any one of claims 18 to 20, wherein the thickness of the first insulating heat insulating sheet (5221) and / or the thickness of the second insulating heat insulating sheet (5222) and / or the thickness of the connection sheet (5223) is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.The battery module according to any one of claims 17 to 21, wherein the electrode portion (212) is formed in a circular shape, wherein a first curved edge (5221a) disposed around the electrode portion (212) is disposed on one side of the first insulating heat insulating sheet (5221) and / or the second insulating heat insulating sheet (5222).The battery module according to any one of claims 15 to 22, wherein the battery module further comprises: a bracket (510), wherein the bus bar unit (520) is installed on the bracket (510), wherein a post-forming portion (511) adapted to the battery cell (210) is disposed on the bracket (510), wherein the battery cell (210) cooperates with the post-forming portion (511).The battery module according to claim 23, wherein on both sides of the battery cell (210), the bus bar unit (520) and the bracket (510) are respectively disposed.A battery pack comprising a housing and at least one battery module according to any one of claims 9 to 24, wherein the battery module is disposed in the housing; wherein a pressure relief valve of the battery pack is disposed on the housing, which is connected to the pressure relief outlet (1220).A power consuming device comprising a power consuming component and a battery pack according to claim 25, wherein the battery pack is used to supply the power consuming component with electrical power.

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