Pressure relief assemblies, battery modules, battery packs, and electrical devices

Abstract

To provide a pressure relief assembly capable of preventing high temperature due to an injection object of thermal runaway from spreading to the surroundings, avoiding occurrence of failure such as continuous thermal runaway and short circuit, and improving use safety and reliability of a battery module, a battery module, a battery pack, and an electrical device.SOLUTION: A pressure relief assembly (100) includes a cooling plate (110) and an isolation assembly (120). The cooling plate (110) is configured to cool a battery cell (210) and a pressure relief is provided. The isolation assembly (120) is connected with the cooling plate (110) to define a pressure relief chamber. The isolation assembly (120) is provided with a pressure relief outlet. The pressure relief inlet communicates with the pressure relief outlet through a pressure relief chamber.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and specifically to a pressure relief assembly, a battery module, a battery pack and an electricity-consuming device. Background Art

[0002] A battery pack usually comprises a casing and a battery module provided in the casing and including a plurality of battery cells. Summary of the Invention Problem to be Solved by the Invention

[0003] During charging and discharging of battery cells, thermal runaway may occur due to excessively high temperature. In the related art, when thermal runaway occurs in a battery cell, the high temperature caused by discharged high-temperature gas, electrode sheets of the battery cell, electrolyte and other substances will spread to adjacent battery cells in the battery module, adversely affecting all the battery cells in the module. As a result, the temperature inside the battery pack becomes excessively high, which may cause failures such as continuous thermal runaway and short circuit. Means for Solving the Problem

[0004] In a first aspect, an embodiment of the present application provides a cooling plate configured to cool battery cells and provided with a pressure relief inlet; and an isolation assembly connected to the cooling plate to define a pressure relief chamber, wherein the isolation assembly is provided with a pressure relief outlet communicating with the pressure relief inlet via the pressure relief chamber, wherein a pressure relief assembly is provided.

[0005] In a second aspect, an embodiment of the present application provides a battery module comprising at least one battery cell provided with a pressure relief structure, and the pressure relief assembly as described above, wherein the pressure relief structure communicates with the pressure relief inlet.

[0006] In a third aspect, an embodiment of the present application provides a battery pack comprising a case provided with a pack-wide pressure relief valve communicating with the pressure relief outlet, and at least one such battery module provided within the case.

[0007] In a fourth aspect, an embodiment of the present application provides an electrical device comprising an electrical component and a battery pack as described above, configured to provide electrical energy to the electrical component. [Effects of the Invention]

[0008] This invention provides a pressure relief assembly and a battery module equipped with the pressure relief assembly. In the pressure relief assembly, the cooling plate not only performs a thermal management function for the battery cell, but also works in conjunction with the isolation assembly to surround and form a pressure relief chamber. When thermal runaway occurs in a battery cell, the high-temperature gas, electrode sheets, and electrolyte ejected from inside the battery cell through the pressure relief structure enter the pressure relief chamber through the pressure relief inlet in the cooling plate. The ejected material in the pressure relief chamber is then discharged outside the battery module through the pressure relief outlet. This prevents the thermal runaway battery cell from ejecting thermal runaway material to nearby battery cells within the battery module. Furthermore, by forming a pressure relief passage in the battery module with the cooling plate, the thermal runaway material from the battery cell is cooled, lowering the temperature of the material ejected during thermal runaway of the battery pack. This prevents the high temperature caused by the thermal runaway material from spreading to the surroundings, avoiding continuous thermal runaway and short-circuit failures, and improving the safety and reliability of the battery module.

[0009] The present invention further provides a battery pack in which a pack-wide pressure relief valve provided in the case communicates with a pressure relief outlet of a pressure relief assembly inside the case. In this pack, ejected material from a thermally runaway battery cell enters the pressure relief chamber through the pressure relief inlet, is discharged to the position of the pack-wide pressure relief valve through the pressure relief outlet, and is further discharged outside the battery pack by the pack-wide pressure relief valve. This prevents the thermally runaway battery cell from ejecting material onto other battery cells, other battery modules, and other components within the battery pack. Contact with the cooling plate lowers the temperature of the thermally runaway ejected material, preventing continuous thermal runaway and short-circuit failures, and significantly improving the thermal safety performance of the battery pack.

[0010] The electrical device described in this application can avoid dangerous accidents caused by thermal runaway of the battery pack, and offers higher safety for use. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram of the structure of a battery module according to an embodiment of the present invention. [Figure 2] This is a schematic diagram of an exploded view of a battery module according to an embodiment of the present invention. [Figure 3] This is a first view of two pressure relief assemblies of a battery module according to an embodiment of the present application. [Figure 4] This is an exploded schematic diagram of a pressure relief assembly according to an embodiment of the present application. [Figure 5] This is a second view of two pressure relief assemblies of a battery module according to an embodiment of the present application. [Figure 6] This is a first view of a battery cell according to an embodiment of the present application. [Figure 7] This is a second view of a battery cell according to an embodiment of the present application. [Figure 8] This is an exploded schematic diagram of a cooling plate according to an embodiment of the present application. [Figure 9] This is a schematic diagram of the refrigerant flow within a cooling plate in one of the pressure relief assemblies according to the embodiment of the present application. [Figure 10]It is a schematic diagram of refrigerant flow in a cooling plate in another pressure relief assembly according to an embodiment of the present application. [Figure 11] It is a structural schematic diagram of a battery module according to an embodiment of the present application. [Figure 12] It is a first view of a battery cell block and two CCS assemblies according to an embodiment of the present application. [Figure 13] It is a second view of a battery cell block and two CCS assemblies according to an embodiment of the present application. [Figure 14] It is a structural schematic diagram of a battery cell block according to an embodiment of the present application. [Figure 15] It is an exploded schematic diagram of a busbar unit and a battery cell according to an embodiment of the present application. [Figure 16] It is an exploded schematic diagram of a busbar unit according to an embodiment of the present application. [Figure 17] It is a schematic diagram of a busbar according to an embodiment of the present application. [Figure 18] It is a first connection schematic diagram of a busbar unit and a battery cell according to an embodiment of the present application. [Figure 19] It is a second connection schematic diagram of a busbar unit and a battery cell according to an embodiment of the present application. [Figure 20] It is a connection schematic diagram of a busbar unit and a battery cell block according to an embodiment of the present application. [Figure 21] It is a structural schematic diagram of a bracket of a CCS assembly according to an embodiment of the present application. DETAILED DESCRIPTION OF EMBODIMENTS

[0012] The battery cells mentioned in the examples of the present application may include lithium ion secondary battery cells, lithium ion primary battery cells, lithium sulfur battery cells, sodium ion battery cells, magnesium ion battery cells, etc., and the examples of the present application are not limited thereto. The battery cell may be in the shape of a flat body, a rectangular parallelepiped, a cylindrical body, or other shapes, and the examples of the present application are not limited thereto either.

[0013] The battery modules and battery packs referred to in the embodiments of this application are single physical blocks comprising multiple battery cells to provide higher voltage and capacity. A battery pack generally comprises a case configured to enclose one or more battery cells, the case can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0014] Embodiments of the present invention provide an electrical device comprising a battery pack and electrical components, wherein the battery pack, as the power supply system of the electrical device, can provide electrical energy to the electrical components to realize corresponding functions. The electrical device may be, but is not limited to, power tools, electric bicycles, electric automobiles, steamships, spacecraft, etc.

[0015] The battery pack described in the embodiments of this application is not limited to application to the above-mentioned electrical devices, but can also be applied to all other electrical devices that use batteries. However, for the sake of brevity, the following embodiments will describe a single electrical device, a vehicle, as an example.

[0016] The vehicle may be a petroleum-fueled vehicle, a natural gas-fueled vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extender vehicle, etc. A battery pack is provided inside the vehicle, and the battery pack may be located at the bottom, front, or rear of the vehicle. The battery pack can be used to power the vehicle, and for example, the battery pack may also serve as the power source for the vehicle's operation. The vehicle may further include a controller and a motor, the controller being used to control the battery pack to power the motor, and for example, to meet the electrical demands for starting the vehicle, navigation, and operation while driving.

[0017] Embodiments of the present invention provide a battery pack for application in electrical devices such as vehicles, thereby lowering the cost of electrical devices and improving production efficiency. The battery pack comprises a case and at least one battery module provided inside the case. The case is configured to provide a housing space for the battery module, and exemplary the case may comprise a first housing and a second housing that overlap each other, and the first housing and the second housing may be connected by bolts or by welding.

[0018] The battery pack case is equipped with a pack-wide pressure relief valve, and in the event of thermal runaway of the battery cells, the material ejected from inside the battery cells can be ejected by this pack-wide pressure relief valve, thus ensuring high safety.

[0019] As shown in Figures 1 and 2, this embodiment provides a battery module comprising at least one battery cell 210 and a pressure relief assembly 100. The pressure relief assembly 100 is configured to provide a pressure relief passage for ejected material during thermal runaway of the battery cell 210, and to guide the high-temperature ejected material to the outside of the battery pack.

[0020] For example, multiple battery cells 210 are arranged in a row, thereby forming a battery cell block 200.

[0021] Referring to Figures 3, 4, and 5, these are schematic diagrams of the structure of the pressure relief assembly 100 according to this embodiment. The pressure relief assembly 100 comprises a cooling plate 110 and an isolation assembly 120.

[0022] The cooling plate 110 is configured to cool the battery cells 210 by directly or indirectly contacting them, and the isolation assembly 120 is located on the side of the cooling plate 110 that is away from the battery cells 210. The cooling plate 110 may cool the battery cells 210 by liquid cooling, air cooling, or direct cooling, and exemplary, the cooling plate 110 is provided with a refrigerant flow path 111. The refrigerant flow path 111 is configured so that a refrigerant medium circulates and flows to lower the temperature of the battery cells 210, and the refrigerant medium may be a liquid such as water, a saline solution, or liquid nitrogen, or a gas such as cold air or ammonia, as long as it can flow in the refrigerant flow path 111 to lower the temperature of the battery cells 210.

[0023] The cooling plate 110 is provided with a pressure relief inlet 112, which allows high-temperature material ejected during thermal runaway of the battery cell 210 to enter the pressure relief inlet 112. The isolation assembly 120 is connected to the cooling plate 110 to define a pressure relief chamber 130, and the isolation assembly 120 is provided with a pressure relief outlet 1220, with the pressure relief inlet 112 communicating with the pressure relief outlet 1220 via the pressure relief chamber 130. The isolation assembly 120 serves to isolate the high-temperature ejected material, preventing it from being sprayed onto other components in the battery pack.

[0024] Referring to Figures 6 and 7, these are schematic diagrams of the structure of a cylindrical battery cell 210, which is provided with a pressure relief structure 211, which faces and communicates with a pressure relief inlet 112 in the cooling plate 110. The battery cell 210 has a pressure relief end face and a negative electrode end face 214 that are opposite each other, with an electrode column provided on the pressure relief end face, and the pressure relief structure 211 is also located in the region where the pressure relief end face is located. The cylindrical side surface of the battery cell 210 is located between the pressure relief end face and the negative electrode end face 214. The pressure relief end face and the negative electrode end face 214 described above are also usually called the top surface and bottom surface of the battery cell 210.

[0025] In other embodiments, the battery cell 210 may be a rectangular battery cell or a battery cell of another shape, provided that the pressure relief structure 211 in the battery cell 210 is in direct contact with and in communication with the pressure relief inlet 112 in the cooling plate 110.

[0026] In some embodiments, as shown in Figures 3 and 5, the isolation assembly 120 overlaps with the cooling plate 110 to define the pressure relief chamber 130 described above. In the pressure relief assembly 100, the cooling plate 110 not only performs thermal management of the battery cell 210, but also works together with the isolation assembly 120 to surround and form the pressure relief chamber 130. When thermal runaway occurs in the battery cell 210, the hot gas, electrode sheets of the battery cell, and electrolyte ejected from inside the battery cell 210 through the pressure relief structure 211 enter the pressure relief chamber 130 through the pressure relief inlet 112 in the cooling plate 110, and the ejected material in the pressure relief chamber 130 further enters the battery module through the pressure relief outlet 1220. The material is discharged outside the tubing, thereby preventing the thermal runaway material from being ejected from a thermal runaway battery cell 210 to nearby battery cells 210 within the battery module. Furthermore, the cooling plate 110 forms a pressure relief passage for the battery module, which cools the thermal runaway material from the battery cells, lowering the temperature of the material ejected during thermal runaway of the battery pack. This prevents the high temperature caused by the thermal runaway material from spreading to the surroundings, avoiding continuous thermal runaway and short-circuit failures, and improving the safety and reliability of the battery module.

[0027] In some other embodiments, the isolation assembly 120 may be located inside the cooling plate 110. In this case, the isolation assembly 120 itself is enclosed inside the cooling plate 110 to form the pressure relief chamber 130 described above. In this embodiment, the isolation assembly 120 has a certain thermal conductivity, and after the runaway projectile enters the pressure relief chamber 130 formed by enclosing the isolation assembly 120, the isolation assembly 120 conducts the high temperature of the runaway projectile to the cooling plate 110 connected to the isolation assembly 120, which in turn enables the cooling plate 110 to cool the runaway projectile.

[0028] In the battery pack according to this embodiment, the pack-wide pressure relief valve provided in the case communicates with the pressure relief outlet 1220 of the pressure relief assembly 100 inside the case. The material ejected from the thermally runaway battery cell 210 enters the pressure relief chamber 130 via the pressure relief inlet 112, is discharged to the position of the pack-wide pressure relief valve via the pressure relief outlet 1220, and is further discharged outside the battery pack by the pack-wide pressure relief valve. This prevents the thermally runaway battery cell 210 from ejecting material onto other battery cells 210, other battery modules, and other components within the battery pack. Contact with the cooling plate 110 lowers the temperature of the thermally runaway material, preventing continuous thermal runaway and short-circuit failures, and significantly improving the thermal safety performance of the battery pack. Electrical devices equipped with the above battery pack can avoid dangerous accidents caused by thermal runaway of the battery pack, resulting in higher safety during use.

[0029] In this embodiment, the pressure relief outlet 1220 is located at the lowest point of the pressure relief chamber 130, thereby allowing the high-temperature ejected material in the pressure relief chamber 130 to flow out through the pressure relief outlet 1220 due to the action of gravity, and preventing the high-temperature ejected material from remaining in the pressure relief chamber 130.

[0030] In other embodiments, the pressure relief outlet 1220 does not necessarily have to be located at the lowest point of the pressure relief chamber; a corresponding flow path can be provided within the battery pack to guide out the high-temperature ejected material discharged from the pressure relief outlet 1220.

[0031] In this embodiment, the horizontal height of the pressure relief inlet 112 is higher than the horizontal height of the pressure relief outlet 1220, which creates a tendency for the high-temperature ejected material to flow from top to bottom. Furthermore, it prevents the high-temperature ejected material in the pressure relief chamber 130 from flowing back to the position of the pressure relief inlet 112, thereby preventing damage to the battery cell block 200.

[0032] In some embodiments, referring to Figures 3, 4, and 5, the isolation assembly 120 comprises an insulating plate 121 and a sealant 122, the insulating plate 121 being spaced apart from the cooling plate 110 and configured to insulate the pressure relief chamber 130 from the outside, and the sealant 122 being ring-mounted around the insulating plate 121 and sealedly connected between the cooling plate 110 and the insulating plate 121, thereby enclosing the cooling plate 110, the insulating plate 121 and the sealant 122 to form the pressure relief chamber 130 described above. This structure can ensure the formation of a pressure relief chamber 130 having a certain thickness, and the installation of the sealant 122 can ensure good circumferential sealing of the pressure relief chamber 130, so that high-temperature ejected material cannot leak through the gap between the insulating plate 121 and the sealant 122, and the gap between the cooling plate 110 and the sealant 122, and can only be discharged through the pressure relief outlet 1220.

[0033] The space between the insulation board 121 and the sealing material 122 may be a single integrated structure or a separate structure.

[0034] The pressure relief outlet 1220 is provided in the insulating plate 121 or the sealant 122. If the battery module has only one pressure relief assembly 100 and the pressure relief assembly 100 is positioned laterally such that the insulating plate 121 is located at the very bottom of the entire battery module, the pressure relief outlet 1220 may be provided in the insulating plate 121, thereby allowing the hot ejected material to be discharged through the bottom pressure relief outlet 1220 due to the action of gravity. If the pressure relief assembly 100 is positioned vertically, as shown in Figure 4, the pressure relief outlet 1220 may be provided at the very bottom of the sealant 122, thereby allowing the hot ejected material to be discharged through the bottom pressure relief outlet 1220 of the sealant 122 due to the action of gravity.

[0035] Of course, in other embodiments, the isolation assembly 120 may not be provided with a sealing material 122, and may only consist of an insulating plate 121. In this case, the pressure relief chamber 130 described above can be defined by the insulating plate 121 and the cooling plate 110 alone.

[0036] As shown in Figure 4, in some embodiments, the insulation plate 121 and / or the cooling plate 110 are provided with a support member 140, which is supported between the insulation plate 121 and the cooling plate 110, maintaining a gap between them, thereby enabling the formation of a pressure relief chamber 130 with a certain space. At the same time, the installation of the support member 140 improves the overall strength of the pressure relief assembly 100, particularly the compressive strength of the insulation plate 121 and the cooling plate 110, and prevents deformation of the cooling plate 110 and the insulation plate 121.

[0037] For example, the support member 140 is a support column provided on the insulation board 121 or the cooling board 110, and the cross-section of the support column may be circular, square, or other shapes. Multiple support members 140 may be provided, distributed in the middle and at both ends of the cooling board 110 to improve the uniformity of support.

[0038] In some embodiments, the insulating plate 121 is made of a metal, such as aluminum, aluminum alloy, stainless steel, copper, or copper alloy, and possesses high strength and good heat insulation capabilities, effectively blocking high-temperature ejected material, trapping high temperatures within the pressure relief chamber 130, and preventing the diffusion of temperature to other battery modules and electronic components within the battery pack.

[0039] In some embodiments, the insulation board 121 may be made of plastic, such as polybutylene terephthalate (PBT) plastic board, which has high strength and good heat insulation capacity.

[0040] In some embodiments, the insulation board 121 may be made of rubber, particularly hard rubber, which ensures strength while also providing excellent insulation performance.

[0041] Similarly, the material of the sealant 122 may be metal, plastic, or rubber. For example, the sealant 122 may be made of aluminum, aluminum alloy, stainless steel, copper, copper alloy, PBT, or hard rubber, possessing high strength and good heat insulation capabilities, preventing puncture by pressure during thermal runaway pressure relief, and improving safety in use.

[0042] In this embodiment, the sealing material 122 is a rubber ring, which ensures airtightness after connection between the heat insulating plate 121 and the cooling plate 110, and at the same time provides a certain degree of seismic and shock resistance, preventing the connection between the heat insulating plate 121 and the cooling plate 110 from being broken.

[0043] The cooling plate 110 may be made of aluminum, aluminum alloy, stainless steel, copper, or copper alloy, and its high strength and high thermal conductivity can improve the cooling rate of the battery cell 210.

[0044] For example, if the sealant 122, cooling plate 110, and insulation plate 121 are all made of metal, the cooling plate 110 and the sealant 122, and the insulation plate 121 and the sealant 122 may be connected by welding or by adhesive, for example, by strong adhesive. If the material of the sealant 122 and / or insulation plate 121 is plastic or rubber, the cooling plate 110 and the sealant 122, and the insulation plate 121 and the sealant 122 may be connected by adhesive, for example, by strong adhesive.

[0045] In some embodiments, an insulating layer may be provided on both sides of the insulating board to improve its insulating ability. The insulating layer is, in example, made of silica fiber.

[0046] Referring to Figure 4, a channel protrusion 1140 is provided on the side of the cooling plate 110 facing the isolation assembly 120. By installing the channel protrusion 1140, the area of ​​the cooling plate 110 is increased, increasing the contact area between the runaway thermal ejecta and the cooling plate 110, thereby improving the heat dissipation effect of the runaway thermal ejecta. Furthermore, the channel protrusion 1140 can also improve the strength of the cooling plate 110, and at the same time, the channel protrusion 1140 can provide a certain support function, preventing the heat insulating plate 121 from deforming significantly toward the cooling plate 110.

[0047] The installation of the flow channel protrusions 1140 creates a certain turbulent flow effect on the high-temperature spray material in the pressure relief chamber 130, increasing the turbulence of the flow of the high-temperature spray material and extending the flow time in the pressure relief chamber 130. This allows for an increase in the contact time between the high-temperature spray material and the cooling plate 110, contributing to an improved cooling effect on the high-temperature spray material.

[0048] Referring to Figure 8, in this embodiment, the cooling plate 110 comprises a flat plate 113 and a flow channel plate 114 that overlap each other. The flow channel protrusion 1140 is provided on the flow channel plate 114, and a flow channel groove 1141 is formed on the side facing the flat plate 113. The refrigerant flow channel 111 is formed by enclosing the groove wall of the flow channel groove 1141 between the flat plate 113. That is, the flow channel plate 114 has an uneven plate structure, and the flow channel protrusion 1140 is formed by, for example, a press process, and the back surface of the flow channel protrusion 1140 is the flow channel groove 1141. Because the flow channel plate 114 is located between the flat plate 113 and the isolation assembly 120, the flat plate 113 of the cooling plate 110 faces outward, and the flat plate 113 is in direct contact with the battery cell block 200 or indirect contact via a heat conductive medium, thereby ensuring a large contact heat exchange area between the battery cell block 200 and the cooling plate, and improving the heat exchange effect. Furthermore, the flat plate 113 and the battery cell block 200 have good adhesion, the presence of voids is avoided, and it is ensured that all high-temperature material ejected by the pressure relief structure 211 of the battery cell 210 enters the pressure relief chamber 130 through the pressure relief inlet 112, thus preventing leakage through the gap between the cooling plate 110 and the battery cell block 200.

[0049] As shown in Figures 4, 9, and 10, the cooling plate 110 is provided with a refrigerant inlet 115 and a refrigerant outlet 116. The refrigerant inlet 115 communicates with the refrigerant outlet 116 via a refrigerant flow path 111. The refrigerant medium enters the refrigerant flow path 111 via the refrigerant inlet 115 and then flows out via the refrigerant outlet 116, thereby achieving circulating flow of the refrigerant medium within the refrigerant flow path 111. Both the refrigerant inlet 115 and the refrigerant outlet 116 are configured to connect to corresponding refrigerant lines. By positioning the refrigerant inlet 115 and the refrigerant outlet 116 at the same end of the cooling plate 110, it is possible to lay the refrigerant lines at one end of the cooling plate 110. Therefore, space for the refrigerant lines only needs to be left on one side of the cooling plate 110, which helps to reduce the overall size of the cooling plate 110 and the battery module.

[0050] As shown in Figures 9 and 10, the flow direction of the refrigerant medium within the refrigerant flow path 111 of the cooling plate 110 is as indicated by the arrows.

[0051] To facilitate the explanation, we will introduce the X, Y, and Z directions. In this embodiment, we take the example that the battery cell 210 is a cylindrical battery cell. The X direction is the axial direction of the battery cell 210, and the three directions, X, Y, and Z, are perpendicular to each other in pairs. Multiple battery cells 210 are arranged along either the Y or Z direction to form a battery cell block 200. Of course, the battery cell 210 may also be a rectangular battery cell.

[0052] In some embodiments, the poles of all battery cells 210 in the battery cell block 200 face to one side, i.e., the pressure relief structure 211 faces to one side. In this case, one pressure relief assembly 100 may be provided only on one side of the battery cell block 200 (i.e., the side where the pressure relief end face is located), and the pressure relief structure 211 in each battery cell 210 faces directly towards the pressure relief inlet 112 in the pressure relief assembly 100. In this case, only one cooling plate 110 is needed on the side where the negative pole end face 214 of the battery cell block 200 is located.

[0053] In some embodiments, referring to Figures 2 and 12, the orientation of the pressure relief structures 211 of the multiple battery cells 210 in the battery cell block 200 is reversed, that is, the pressure relief structures 211 of some battery cells 210 face one side and the pressure relief structures 211 of other battery cells 210 face the other side. Two pressure relief assemblies 100 are provided, each located on either side along the X direction of the multiple battery cells 210, providing pressure relief passages to the corresponding pressure relief structures 211, so that any ejecta from thermal runaway in all battery cells 210 can be discharged through the pressure relief outlets 1220 of the corresponding pressure relief assemblies 100.

[0054] In other words, if the orientation of the pressure relief structures 211 of multiple cylindrical battery cells is different, the two pressure relief assemblies 100 are located at both ends along the axial direction of the cylindrical battery cell, so that the high-temperature ejected material from the pressure relief structures 211 on both sides can be discharged by the corresponding pressure relief assemblies 100.

[0055] In some other embodiments of the battery module, the number of pressure relief assemblies 100 can be set as needed, for example, a pressure relief assembly 100 may be provided on either side of the battery cell block 200 where the pressure relief structure 211 is located, and there is no limitation on the number of pressure relief assemblies 100.

[0056] In the above embodiment, referring to Figures 12 and 14, a plurality of battery cells 210 are arranged in a line along the Y direction to form a first battery cell unit, and a plurality of battery cells 210 are arranged in a line along the Y direction to form a second battery cell unit. The orientation 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. For example, in the orientation shown in Figure 14, the pressure relief end face of the first battery cell unit faces upward, and the negative electrode end face 214 of the second battery cell unit faces upward. The first battery cell units and the second battery cell units are arranged sequentially and alternately in multiple rows, with at least one first battery cell unit and at least one second battery cell unit provided along the Y direction, and the first and second battery cell units distributed sequentially and alternately, and at least one first battery cell unit and at least one second battery cell unit provided along the Z direction, and the first and second battery cell units distributed sequentially and alternately, thereby enabling the multiple battery cells 210 in the battery cell block 200 to be connected in parallel first and then in series.

[0057] Each of the two pressure relief assemblies 100 has multiple pressure relief inlets 112, the multiple pressure relief inlets 112 of one of the pressure relief assemblies 100 facing a plurality of first battery cell units and its refrigerant flow path 111 facing the second battery cell units so that the refrigerant medium flows over the negative electrode end face 214 of the second battery cell units to cool them down, and the multiple pressure relief inlets 112 of the other pressure relief assembly 100 facing a plurality of second battery cell units and its refrigerant flow path 111 facing the first battery cell units so that the refrigerant medium flows over the negative electrode end face 214 of the first battery cell units to cool them down.

[0058] In other words, in the pressure relief assembly 100 that provides a pressure relief passage to the first battery cell unit, the cooling plate 110 is provided with one pressure relief inlet 112 corresponding to each first battery cell unit. That is, multiple battery cells 210 in the first battery cell unit share one pressure relief inlet 112, which simplifies the manufacturing process and improves production efficiency.

[0059] In the pressure relief assembly 100 that provides a pressure relief passage to the second battery cell unit, one pressure relief inlet 112 is provided on the cooling plate 110, corresponding to each second battery cell unit. That is, multiple battery cells 210 in the second battery cell unit share one pressure relief inlet 112, which simplifies the manufacturing process and improves production efficiency.

[0060] The battery module further includes an elastic tube. The elastic tube is configured to connect the cooling plates 110 of the two pressure relief assemblies 100. In this embodiment, the elastic tube communicates with the refrigerant flow path 111 of the cooling plate 110. By employing the elastic tube, not only is it possible to facilitate the flow of the refrigerant medium within the two cooling plates 110, but the elastic performance of the elastic tube allows for elastic deformation, thereby absorbing assembly tolerances when stacking the battery cell blocks and achieving the effect of conforming to the mounting tolerances of the two pressure relief assemblies 100.

[0061] Referring to Figures 1, 2, and 3, two elastic tubes are provided, which are the first connecting tube 300 and the second connecting tube 400, respectively. The first connecting tube 300 connects the refrigerant inlets 115 of the cooling plates 110 of the two pressure relief assemblies 100, and the second connecting tube 400 connects the refrigerant outlets 116 of the cooling plates 110 of the two pressure relief assemblies 100. This enables communication between the cooling plates 110 in the two pressure relief assemblies 100, allowing the refrigerant medium to be injected from one cooling plate 110 into the other, eliminating the need for a piping arrangement structure, simplifying the structure, and reducing the occupied space.

[0062] Continuing with reference to Figures 1, 2, and 3, one of the pressure relief assemblies 100 has an insulating plate 121 provided with a first pipe fitting 150 and a second pipe fitting 160, the first pipe fitting 150 being configured to connect to an inlet pipe for injecting the refrigerant medium, and the second pipe fitting 160 being configured to connect to an outlet pipe for discharging the refrigerant medium, and the first pipe fitting 150 and the second pipe fitting 160 pass through the insulating plate 121 and communicate with the cooling plate 110 in the pressure relief assembly 100. Another pressure relief assembly 100 has a cooling plate 110 provided with a third pipe fitting 170 and a fourth pipe fitting 180, the third pipe fitting 170 being connected to the refrigerant inlet 115 of the cooling plate 110, and the fourth pipe fitting 180 being connected to the refrigerant outlet 116 of the cooling plate 110. The first pipe fitting 150 described above is connected to the third pipe fitting 170 via the first connecting pipe 300, and the second pipe fitting 160 is connected to the fourth pipe fitting 180 via the second connecting pipe 400, thereby achieving communication between the cooling plates 110 in the two pressure relief assemblies 100.

[0063] In some embodiments, both the first connecting pipe 300 and the second connecting pipe 400 are bellows tubes. The bellows tubes can effectively absorb stacking tolerances between the battery modules and at the same time ensure airtightness at the connection point of the two cooling plates 110.

[0064] In this embodiment, the space between the X-direction described above and the bottom plate of the battery pack case is provided with an angle α, where α is between 0° and 15°. That is, after the battery module is installed inside the battery pack, the space between the axis of the cylindrical battery cell and the bottom plate of the case is an angle of 0 to 15°. For example, the angle between the axis of the cylindrical battery cell and the bottom plate of the case is 0° (in this case, the two are parallel), 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, etc. In this case, two pressure relief assemblies 100 are placed vertically, and the pressure relief outlet 1220 is provided facing downward, allowing the high-temperature ejected material in the pressure relief chamber 130 to be discharged from the pressure relief outlet 1220 by the action of gravity and finally discharged by the overall pack pressure relief valve in the case.

[0065] Referring to Figures 2 and 11, the battery module further comprises a Cells Contact System (CCS) assembly 500, which comprises a bracket 510, a busbar unit 520, and a sampling unit 530. Both the busbar unit 520 and the sampling unit 530 are mounted on the bracket 510. The busbar unit 520 is electrically connected to the battery cells 210, and conductivity is achieved, for example, by welding. The sampling unit 530 is electrically connected to the busbar unit 520 and is configured to sample voltage and temperature signals from the battery cell block 200.

[0066] Referring to Figures 12 and 13, the bracket 510 is provided with a copy portion 511 that fits the battery cell 210. By fitting the battery cell 210 and the copy portion 511 together, the position of the battery cell 210 is positioned and fixed. The bracket 510 serves as both a mounting carrier for the busbar unit 520 and the sampling unit 530, and a carrier for the battery cell block 200. This simplifies the structure of the battery module, greatly improves production efficiency, and simultaneously greatly reduces the material cost of the battery module.

[0067] For example, the tracing portion 511 is a tracing hole, and when arranging the battery cells 210, the battery cells 210 can be placed inside the tracing hole.

[0068] Because the poles of the multiple battery cells 210 are oriented in opposite directions, one CCS assembly 500 is provided on either side of the battery cell block 200 along the X direction. Referring to Figures 12 and 13, each of the brackets 510 of the two CCS assemblies 500 is provided with a tracing portion 511 that corresponds one-to-one with the battery cells 210. During the stacking process, the stacking of the battery cell block 200 can be completed by aligning the battery cells 210 according to the tracing portions 511 on the brackets 510 of the CCS assembly 500. After the stacking is complete, the busbar units 520 and other components of the CCS assembly 500 are welded, and then the cooling plates 110 of the pressure relief assemblies 100 on both sides are connected to the corresponding side of the CCS assembly 500. This simplifies the molding process and improves the efficiency of the stacking process.

[0069] Since both sides of the CCS assembly 500's bracket 510 are provided with a tracing portion 511 (in this embodiment, an exemplary tracing hole), the brackets 510 of both sides of the CCS assembly 500 can directly support the battery cells 210 laterally, eliminating the need to use a tray to position multiple battery cells 210. This reduces the use of parts in the battery module assembly process, simplifies the battery module assembly process, reduces the size of the battery module along the X direction, makes the battery module structure more compact, reduces the occupied space, and improves energy density.

[0070] Bracket 510 is, for example, made of plastic.

[0071] In this embodiment, the CCS assembly 500 is a fully integrated block, meaning that the bracket 510, busbar unit 520, and harvesting unit 530 can be assembled together first to form the complete CCS assembly 500, enabling overall loading and faster cycle times.

[0072] Referring to Figure 2, the cooling plate 110 of the pressure relief assembly 100 is located on the side of the busbar unit 520 that is away from the battery cells 210, and the cooling plate 110 is in direct or indirect contact with the busbar unit 520 to achieve cooling of the busbar unit 520 and the battery cells 210.

[0073] In some embodiments, a heat conduction medium is provided between the cooling plate 110 and the busbar unit 520 to ensure sufficient contact between the cooling plate 110 and the busbar unit 520, improve heat exchange efficiency, and enable rapid cooling of the busbar unit 520 and the battery cell 210. The heat conduction medium is exemplary a heat conduction structural adhesive. Since the refrigerant flow path 111 faces the negative electrode end face 214 of the battery cell 210, the cooling location is the negative electrode of the battery cell, and the heat conduction path is cooling plate 110 → heat conduction structural adhesive → busbar unit 520 in the CCS assembly 500 → negative electrode of the battery cell 210.

[0074] As shown in Figure 15, this is a schematic diagram of the structure of the busbar unit 520 and battery cell 210 according to this embodiment. In conjunction with Figure 6, an electrode area 212 is provided at one end of the battery cell 210, and the electrode area 212 and the pressure relief structure 211 are located at the same end of the battery cell 210. That is, the electrode area 212 and the pressure relief structure 211 are provided simultaneously at one end of the battery cell 210.

[0075] Referring to Figure 16, the busbar unit 520 comprises a busbar 521 and an insulating and heat-insulating section 522. The busbar 521 is made of a metallic material, such as aluminum, aluminum alloy, copper, copper alloy, etc., and has good conductive properties, while the insulating and heat-insulating section 522 may be made using a non-metallic material with good insulating and heat-resistant properties.

[0076] Referring to Figure 17, the busbar 521 comprises a connected conductive portion 5211 and a first connecting portion 5212, the first connecting portion 5212 being provided on one side of the conductive portion 5211. The first connecting portion 5212 is electrically connected to the electrode area 212, and the electrical connection is achieved, for example, by laser welding. Referring to Figure 18, the insulating and heat insulating portion 522 comprises a first insulating and heat insulating film 5221, the first insulating and heat insulating film 5221 covering the side of the conductive portion 5211 facing the battery cell 210 and facing the pressure relief structure 211, the pressure relief structure 211 being separated from the conductive portion 5211 by the first insulating and heat insulating film 5221.

[0077] By providing the first insulating heat-insulating film 5221 on the side of the conductive portion 5211 of the busbar 521 that faces the battery cell 210, the heat-insulating barrier effect of the first insulating heat-insulating film 5221 prevents thermal runaway in the battery cell 210 from being ejected onto the first insulating heat-insulating film 5221, thereby preventing the ejected material from directly connecting to the battery cell 210 and the busbar 521 and causing a short circuit, and also preventing high temperatures from spreading to the busbar 521, thereby improving the safety and reliability of the battery pack.

[0078] For example, the electrode area 212 is either the positive electrode area or the negative electrode area 213 of the battery cell 210. For some battery cells 210, one end is provided with only the positive electrode area and the pressure relief structure 211, or only the negative electrode area 213 and the pressure relief structure 211. For other battery cells 210, one end is simultaneously provided with the positive electrode area, the negative electrode area 213, and the pressure relief structure 211. When the first connection portion 5212 of the busbar 521 is connected to the positive electrode area, the first insulating heat-insulating film 5221 isolates the negative electrode area 213 from the conductive portion 5211 and isolates the pressure relief structure 211 from the conductive portion 5211. When the first connection portion 5212 of the busbar 521 is connected to the negative electrode area 213, the first insulating heat-insulating film 5221 isolates the positive electrode area from the conductive portion 5211 and isolates the pressure relief structure 211 from the conductive portion 5211. In this way, it is possible to avoid a short circuit occurring when the positive electrode area and the negative electrode area 213 are simultaneously electrically connected to the busbar 521, and it is also possible to isolate high-temperature ejected material from the pressure relief structure 211.

[0079] Taking the example of a cylindrical battery cell 210, for instance, in the case of a cylindrical battery cell with model number 21700, referring to Figure 6, both end faces along the X direction are the pressure relief end face and the negative electrode end face 214, respectively. The area between the pressure relief end face and the negative electrode end face 214 is the cylindrical side surface 215. The pressure relief end face is provided with an electrode column and a pressure relief structure 211. The electrode column is the positive electrode area of ​​the battery cell 210, and the area surrounding the electrode column is the negative electrode area 213. The cylindrical side surface 215 of the battery cell 210 is also the negative electrode. When the busbar unit 520 according to this embodiment is connected to the cylindrical battery cell, the first insulating heat-insulating film 5221 provided on the busbar 521 can isolate the high-temperature thermal runaway ejected by the pressure relief structure 211, isolate the positive electrode area and the negative electrode area 213, and prevent the positive and negative electrodes from being connected to the busbar 521 simultaneously and causing a short circuit.

[0080] Preferably, referring to Figures 15 and 19, the insulating and heat-insulating portion 522 further comprises a second insulating and heat-insulating film 5222, the second insulating and heat-insulating film 5222 covering the side of the conductive portion 5211 facing away from the battery cell 210. The second insulating and heat-insulating film 5222 isolates and blocks the thermal runaway material ejected from the battery cell 210 to the side of the conductive portion 5211 facing away from the battery cell 210, preventing the battery cell 210 from being directly electrically connected to the back of the busbar 521 by conductive thermal runaway material, thereby avoiding the occurrence of a short circuit and preventing the high temperature of the thermal runaway from spreading to the busbar 521.

[0081] Referring to Figure 18, the insulating and heat-insulating section 522 further comprises a connecting film 5223, and the first insulating and heat-insulating film 5221 and the second insulating and heat-insulating film 5222 on both sides of the conductive section 5211 are connected by the connecting film 5223, and the connecting film 5223 covers the side edges of the conductive section 5211. That is, the insulating and heat-insulating section 522 completely covers both sides and edges of the conductive section 5211, preventing thermal runaway ejecta from directly and electrically connecting to the busbar 521 in all directions, and preventing high temperatures caused by thermal runaway ejecta from spreading to the busbar 521, thereby avoiding the busbar 521 becoming excessively hot and improving the operational safety and reliability of the battery pack.

[0082] In some embodiments, the first insulating film 5221 and / or the second insulating film 5222 and / or the connecting film 5223 are bonded to the conductive portion 5211, resulting in a strong, convenient, and reliable connection. In this embodiment, the first insulating film 5221, the second insulating film 5222, and the connecting film 5223 are all bonded to the conductive portion 5211. For example, adhesive is provided on the first insulating film 5221, the second insulating film 5222, and the connecting film 5223, and after the entire insulating film 522 and the conductive portion 5211 of the busbar 521 are brought into close contact, a hot press process is employed to melt the adhesive on the insulating film 522 at a high temperature, thereby achieving a strong bond between the insulating film 522 and the conductive portion 5211 of the busbar 521.

[0083] The first insulating thermal insulation film 5221 and / or the second insulating thermal insulation film 5222 and / or the connecting film 5223 are polyimide (PI) films or mica paper films. Exemplarily, the first insulating thermal insulation film 5221, the second insulating thermal insulation film 5222 and the connecting film 5223 are all PI films, meaning the entire insulating thermal insulation section 522 is made of a PI film, which has excellent high-temperature resistance and electrical insulation properties, effectively blocking the simultaneous electrical connection of the positive electrode area and the negative electrode area 213 to the busbar 521, and effectively isolating thermal runaway ejecta. Alternatively, the first insulating heat-insulating film 5221, the second insulating heat-insulating film 5222, and the connecting film 5223 are all made of mica paper, meaning the entire insulating heat-insulating section 522 is made of mica paper, which can be used in environments of 500 degrees Celsius, effectively isolates thermal runaway ejected material, prevents high-temperature diffusion, and has good insulating performance, and can isolate the negative electrode area 213 from the conductive part 5211, or the positive electrode area from the conductive part 5211.

[0084] In some embodiments, the thickness of the first insulating thermal insulation film 5221 and / or the second insulating thermal insulation film 5222 and / or the connecting film 5223 is 0.1 mm or more and 0.5 mm or less. The thickness of the first insulating thermal insulation film 5221 and / or the second insulating thermal insulation film 5222 and / or the connecting film 5223 may be within the range of 0.1 mm or more and 0.3 mm or less. The insulating thermal insulation portion 522 of this thickness ensures that the negative electrode area 213 (or positive electrode area) and the conductive portion 5211 are effectively isolated, preventing it from being too thin and being punctured and destroyed by the spray pressure of the propellant during thermal runaway of the battery cell 210, and not being too thick and increasing material costs. For example, the first connection part 5212 is connected to the positive electrode area, and for some types of cylindrical battery cells, the positive electrode area and the negative electrode area 213 are in the same plane. If the first insulating film 5221 is made excessively thick, the first insulating film 5221 will be interposed between the negative electrode area 213 and the conductive part 5211, creating a gap between the first connection part 5212 and the positive electrode area, which increases the difficulty of welding.

[0085] For example, the thickness of the first insulating heat-insulating film 5221, the second insulating heat-insulating film 5222, and the connecting film 5223 may be the same, or they 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, etc.

[0086] In some embodiments, the battery cell 210 connected to the busbar 521 is a cylindrical battery cell as shown in Figures 6 and 7, where the electrode area 212 is the positive electrode area, and a negative electrode area 213 is provided in a ring around the positive electrode area, and the negative electrode area 213 and the positive electrode area are on the same end face of the battery cell 210. The negative electrode end face 214 and the positive electrode area of ​​the cylindrical battery cell are provided at both ends of the cylindrical battery cell, respectively, along the axial direction of the cylindrical battery cell. As shown in Figure 17, the busbar 521 further comprises a second connector 5213, and the second connector 5213 and the first connector 5212 are provided on opposite sides of the conductive portion 5211, respectively. The busbar 521 can connect two cylindrical battery cells that are oriented in opposite directions by the first connector 5212 and the second connector 5213. The first connection part 5212 is connected to the positive electrode area of ​​one of the battery cells 210, and the second connection part 5213 is electrically connected to the negative electrode end face 214 of another battery cell 210.

[0087] The electrode area 212 is circular in shape. In the above embodiment, the positive electrode area of ​​the cylindrical battery cell is circular. Referring to Figures 18 and 19, a first arc-shaped edge 5221a is provided on one side of the first insulating heat-insulating film 5221 and / or the second insulating heat-insulating film 5222. The first arc-shaped edge 5221a is surrounded by the electrode area 212, i.e., outside the positive electrode area. The first arc-shaped edge 5221a may be provided on one side of both the first insulating heat-insulating film 5221 and the second insulating heat-insulating film 5222, or it may be provided on one of the first insulating heat-insulating film 5221 and the second insulating heat-insulating film 5222. The negative electrode end face 214 is also circular in shape, and a second arc-shaped side 5221b is provided on both the side of the first insulating heat-insulating film 5221 that faces away from the first connection portion 5212 and / or the side of the second insulating heat-insulating film 5222 that faces away from the first connection portion 5212, and the second arc-shaped side 5221b is enclosed outside the negative electrode end face 214. The second arc-shaped side 5221b may be provided on either the first insulating heat-insulating film 5221 or the second insulating heat-insulating film 5222, or the second arc-shaped side 5221b may be provided on only one of the first insulating heat-insulating film 5221 or the second insulating heat-insulating film 5222. The shape and size of the first arc-shaped side 5221a conform to the outer contour of the positive electrode area, and the second arc-shaped side 5221b conforms to the outer contour of the negative electrode end face 214. By providing the first arc-shaped side 5221a, which surrounds the area outside the positive electrode, and the second arc-shaped side 5221b, which surrounds the area outside the negative electrode end face 214, the first insulating heat-insulating film 5221 and the second insulating heat-insulating film 5222 can cover as much as possible the portion of the busbar 521 that is not electrically connected to the battery cell 210, i.e., cover the entire conductive portion 5211, thereby protecting the busbar 521 from direct contact with thermal runaway ejecta over a wide area. As shown in Figure 17, the area indicated by the dotted line is the conductive portion 5211, and the first insulating heat-insulating film 5221 and the second insulating heat-insulating film 5222 should be placed within the area enclosed by the dotted line.

[0088] Referring to Figures 19 and 20, one busbar 521 can connect two rows of battery cells 210 with different pole orientations, the two rows of battery cells 210 being a first battery cell unit and a second battery cell unit, each comprising a plurality of battery cells 210 arranged along the Y direction, the first battery cell unit and the second battery cell unit being arranged along the Z direction, and the axial direction of the battery cells 210 being the X direction. The X, Y, and Z directions are perpendicular in pairs.

[0089] In the first and second battery cell units, the orientation of the battery cells 210 is reversed. Referring to Figures 19 and 20, the first connection portion 5212 and the second connection portion 5213 are provided on both sides of the conductive portion 5211 along the Z direction. Of these, multiple first connection portions 5212 and second connection portions 5213 are provided along the Y direction, and the multiple first connection portions 5212 correspond one-to-one with the multiple battery cells 210 of the first battery cell unit, and the multiple second connection portions 5213 correspond one-to-one with the multiple battery cells 210 of the second battery cell unit. Multiple first connection points 5212 are connected in a one-to-one correspondence to multiple positive electrode areas in the first battery cell unit, and the negative electrode area 213 and the conductive part 5211 in the first battery cell unit are isolated by the first insulating heat-insulating film 5221. Multiple second connection points 5213 are connected in a one-to-one correspondence to multiple negative electrode end faces 214 in the second battery cell unit. Both the first insulating heat-insulating film 5221 and the second insulating heat-insulating film 5222 extend along the Y direction, thereby providing isolation and shielding between the negative electrode area 213 of each battery cell 210 and the busbar 521, and providing isolation and shielding against thermal runaway ejecta from each battery cell 210.

[0090] The first connecting portion 5212 is convex to one side of the conductive portion 5211, is nearly circular in shape, and conforms to the shape and size of the positive electrode area. A groove is formed between two adjacent first connecting portions 5212, and the bottom wall of the groove is the side edge of the conductive portion 5211, where the connecting film 5223 is placed. Both ends of the first insulating heat-insulating film 5221 along the Y direction are connected to the second insulating heat-insulating film 5222 by the connecting film 5223, thereby covering both sides of the conductive portion 5211 along the Y direction.

[0091] Referring to Figure 17, a positioning hole 5214 is provided in the middle of the second connection portion 5213. In the process of welding the second connection portion 5213 to the negative electrode end face 214 of the battery cell 210 to achieve a conductive connection, the positioning hole 5214 is used to identify the weld and ensure that the welding path is in the designed trajectory.

[0092] Referring to Figure 21, a busbar engagement groove 512 is provided on the side of the bracket 510 facing away from the battery cell 210. The busbar engagement groove 512 is configured to accommodate and engage the busbar unit 520. The shape and size of the busbar engagement groove 512 are matched to the shape and size of the busbar 521, and it serves to position and fix the busbar unit 520.

[0093] If the busbar 521 is connected only to the negative terminal end face 214 but not to the positive terminal area, there is no need to provide the insulating and heat-insulating portion 522, for example, the negative terminal output stage busbar 521 shown in the lower left corner of Figure 11. If the busbar 521 is connected only to the positive terminal area but not to the negative terminal end face 214, there is no need to provide the second connection portion 5213, and the side of the first insulating and heat-insulating film 5221 and the second insulating and heat-insulating film 5222 that is facing away from the first arc-shaped side 5221a can be a right side, for example, the positive terminal output stage busbar 521 shown in the lower right corner of Figure 11.

[0094] For example, the uppermost busbar 521 in Figure 11 is a series-connected busbar, and the busbar 521 is connected to one first battery cell unit and one second battery cell unit arranged along the Y direction. Accordingly, the busbar 521 is provided with one row of first connection portions 5212 and one row of second connection portions 5213, which are arranged along the Y direction, the first connection portions 5212 are connected to the positive electrode area of ​​the first battery cell unit, and the second connection portions 5213 are connected to the negative electrode area 213 of the second battery cell unit. In this series-connected busbar, it is sufficient to provide an insulating and heat-insulating portion 522 only in the corresponding area facing the first battery cell unit, and it is not necessary to provide an insulating and heat-insulating portion 522 in the area facing the second battery cell unit.

[0095] Referring to Figures 11 and 13, the sampling unit 530 comprises a sampling circuit board 531, voltage sampling strips 532, and a connector 533. The sampling circuit board 531 is, in example, an FPC flexible circuit board to which a plurality of voltage sampling strips 532 are connected. The voltage sampling strips 532 are electrically connected to a busbar 521 to sample voltage signals. The connector 533 is electrically connected to one end of the sampling circuit board 531 as a data sampling output interface. [Explanation of Symbols]

[0096] 100... Pressure relief assembly, 200... Battery cell block, 300... First connecting pipe, 400... Second connecting pipe, 500... CCS assembly, 110...Cooling plate, 120...Isolation assembly, 130...Pressure relief chamber, 140...Support material, 150...First pipe fitting, 160...Second pipe fitting, 170...Third pipe fitting, 180...Fourth pipe fitting, 111... Refrigerant flow path, 112... Pressure relief inlet, 113... Flat plate, 114... Flow path plate, 1140... Flow path protrusion, 1141... Flow path groove, 115... Refrigerant inlet, 116... Refrigerant outlet, 121...Insulation board, 122...Sealing material, 1220...Pressure relief outlet, 210...Battery cell, 211...Pressure relief structure, 212...Electrode area, 213...Negative electrode area, 214...Negative electrode end face, 215...Cylindrical side surface, 510...Bracket, 520...Busbar unit, 530...Collection unit, 511... Copy section, 512... Bus bar access groove, 521...Bus bar, 522...Insulation and heat-insulating section, 5211...Conductive part, 5212...First connection part, 5213...Second connection part, 5214...Positioning hole, 5221...First insulating film, 5222...Second insulating film, 5223...Connecting film, 5221a...first arc side, 5221b...second arc side, 531...Sampling circuit board, 532...Voltage sampling strip, 533...Connector.

Claims

1. A cooling plate (110) configured to cool the battery cell (210) and provided with a pressure relief inlet (112), The system comprises an isolation assembly (120) connected to the cooling plate (110) to define a pressure relief chamber (130), and an isolation assembly (120) provided with a pressure relief outlet (1220) that communicates with the pressure relief inlet (112) via the pressure relief chamber (130), The isolation assembly (120) comprises an insulating plate (121) and a sealing material (122), wherein the insulating plate (121) is configured to insulate the pressure relief chamber (130) from the outside and is provided at a distance from the cooling plate (110), and the sealing material (122) is sealedly connected between the cooling plate (110) and the insulating plate (121), enclosing the cooling plate (110), the insulating plate (121), and the sealing material (122) to form the pressure relief chamber (130). Pressure relief assembly.

2. A support member (140) is provided on at least one of the heat insulating plate (121) and the cooling plate (110), and the support member (140) is supported between the heat insulating plate (121) and the cooling plate (110). The pressure relief assembly according to claim 1.

3. The pressure relief outlet (1220) is provided in the heat insulating plate (121) or the sealing material (122), The pressure relief assembly according to claim 1.

4. The cooling plate (110) and the sealing material (122), or the insulating plate (121) and the sealing material (122), are connected by adhesive or welding, or the cooling plate (110) and the sealing material (122), and the insulating plate (121) and the sealing material (122) are both connected by adhesive or welding. The pressure relief assembly according to claim 1.

5. The pressure relief outlet (1220) is located at the lowest point of the pressure relief chamber (130), and the horizontal height of the pressure relief inlet (112) is higher than the horizontal height of the pressure relief outlet (1220). The pressure relief assembly according to claim 1.

6. A flow channel protrusion (1140) is provided on the side of the cooling plate (110) facing the isolation assembly (120). The pressure relief assembly according to claim 1.

7. The cooling plate (110) comprises a flat plate (113) and a flow channel plate (114) that overlap each other, the flow channel plate (114) is located between the flat plate (113) and the isolation assembly (120), the flow channel protrusion (1140) is provided on the side of the flow channel plate (114) that is backward from the flat plate (113), and a flow channel groove (1141) is formed on the side facing the flat plate (113). The pressure relief assembly according to claim 6.

8. The present invention comprises at least one battery cell (210) provided with a pressure relief structure (211), and a pressure relief assembly according to any one of claims 1 to 7, wherein the pressure relief structure (211) communicates with the pressure relief inlet (112), Battery module.

9. The battery cells (210) are provided in multiple quantities, and the pressure relief structures (211) of the multiple battery cells (210) are provided with their orientations separated along the X direction, and at least two pressure relief assemblies (100) are provided, and at least two of the pressure relief assemblies (100) are provided on both sides of the multiple battery cells (210) along the X direction. The battery module according to claim 8.

10. The present invention further comprises an elastic tube that connects the cooling plates (110) of two of the pressure relief assemblies (100) and is deformable to conform to the mounting tolerances of the pressure relief assemblies (100). The battery module according to claim 9.

11. Multiple battery cells (210) are arranged side by side to form a first battery cell unit, and multiple battery cells (210) are arranged side by side to form a second battery cell unit, the orientation 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, and the first battery cell units and the second battery cell units are arranged alternately in multiples. Each of the two pressure relief assemblies (100) has a plurality of pressure relief inlets (112), the plurality of pressure relief inlets (112) of one of the pressure relief assemblies (100) facing the plurality of first battery cell units, and the plurality of pressure relief inlets (112) of the other pressure relief assembly (100) facing the plurality of second battery cell units. The battery module according to claim 9.

12. The space between the X-direction and the bottom plate of the battery pack is provided with an angle α, and the range of values ​​for α is 0 to 15°. The battery module according to claim 11.

13. The battery cell (210) is a cylindrical battery cell, and the two pressure relief assemblies (100) are located at both ends along the axial direction of the cylindrical battery cell, The battery module according to claim 8.

14. The system further comprises a busbar unit (520) configured to be electrically connected to the battery cell (210), The cooling plate (110) is located on the side of the busbar unit (520) facing away from the battery cell (210) and is in direct or indirect contact with the busbar unit (520). The battery module according to claim 8.

15. An electrode area (212) is provided at one end of the battery cell (210), and the electrode area (212) and the pressure relief structure (211) are located at the same end of the battery cell (210). The aforementioned busbar unit is A busbar (521) having a conductive part (5211) that is connected, and a first connecting part (5212) that is electrically connected to the electrode area (212), The conductive portion (5211) is covered on the side facing the battery cell (210) and has a first insulating heat-insulating film (5221) facing the pressure relief structure (211), and the pressure relief structure (211) has an insulating heat-insulating portion (522) separated from the conductive portion (5211) by the first insulating heat-insulating film (5221), The battery module according to claim 14.

16. The insulating and heat-insulating portion (522) further comprises a second insulating and heat-insulating film (5222) that covers the side of the conductive portion (5211) that faces away from the battery cell (210). The battery module according to claim 15.

17. The insulating and heat-insulating portion (522) further comprises a connecting film (5223), the first insulating and heat-insulating film (5221) and the second insulating and heat-insulating film (5222) are connected by the connecting film (5223), and the connecting film (5223) covers the side edge of the conductive portion (5211). The battery module according to claim 16.

18. At least one of the first insulating heat-insulating film (5221), the second insulating heat-insulating film (5222), and the connecting film (5223) is bonded to the conductive portion (5211). The battery module according to claim 17.

19. At least one of the first insulating heat-insulating film (5221), the second insulating heat-insulating film (5222), and the connecting film (5223) is a polyimide PI film or a mica paper film. The battery module according to claim 17.

20. The thickness of at least one of the first insulating heat-insulating film (5221), the second insulating heat-insulating film (5222), and the connecting film (5223) is 0.1 mm or more and 0.5 mm or less. The battery module according to claim 17.

21. The electrode area (212) is circular in shape, and at least one side of the first insulating heat-insulating film (5221) and the second insulating heat-insulating film (5222) is provided with a first arc-shaped side (5221a) that is surrounded by the electrode area (212). The battery module according to claim 16.

22. The busbar unit (520) is attached to a bracket (510) which is further provided with a profile portion (511) that fits the battery cell (210), The battery cell (210) and the copy portion (511) are fitted together. The battery module according to claim 14.

23. The busbar unit (520) and the bracket (510) are provided on either side of the battery cell (210). The battery module according to claim 22.

24. The device comprises a case in which a pack-wide pressure relief valve is provided, and at least one battery module according to claim 8 provided inside the case, wherein the pack-wide pressure relief valve communicates with the pressure relief outlet (1220), Battery pack.

25. The battery pack comprises an electrical component and the battery pack according to claim 24 configured to provide electrical energy to the electrical component. Electrical equipment.

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