Pressure relief assembly, battery module, battery pack, and electrical device

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 more particularly to pressure relief assemblies, battery modules, battery packs and electrical-using devices. [Background technology]

[0002] A battery pack typically includes a case and a battery module that is provided in the case and includes a plurality of battery cells. Summary of the Invention [Problem to be solved by the invention]

[0003] During charging and discharging, battery cells may experience thermal runaway due to excessively high temperatures. In related art, when thermal runaway occurs in a battery cell, the high temperatures caused by the emitted high-temperature gas, the electrode sheets of the battery cells, the electrolyte, and other materials spread to adjacent battery cells within the battery module, adversely affecting all of the battery cells within the module. As a result, the temperature inside the battery pack may become too high, potentially causing repeated thermal runaway and failures such as short circuits. [Means for solving the problem]

[0004] In a first aspect, embodiments of the present application include: a cooling plate configured to cool the battery cells and provided with a pressure relief inlet; an isolation assembly connected to the cooling plate to define a pressure relief chamber, the isolation assembly having a pressure relief outlet communicating with the pressure relief inlet through the pressure relief chamber.

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

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

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

[0008] The present application provides a pressure relief assembly and a battery module including the pressure relief assembly. In the pressure relief assembly, the cooling plate not only performs thermal management for the battery cells, but also cooperates with the isolation assembly to form a surrounding pressure relief chamber. When thermal runaway occurs in a battery cell, high-temperature gas, the electrode sheet of the battery cell, electrolyte, and other jets of material ejected from the inside of the battery cell through the pressure relief structure enter the pressure relief chamber through the pressure relief inlet in the cooling plate, and the jets in the pressure relief chamber are then discharged to the outside of the battery module through the pressure relief outlet, thereby preventing the thermal runaway battery cell from ejecting its jets of material onto nearby battery cells in the battery module. Furthermore, the cooling plate forms a pressure relief path for the battery module, which reduces the temperature of the jets of material ejected during thermal runaway in the battery pack, preventing the high temperature caused by the jets of material ejected during thermal runaway from spreading to the surrounding area. This avoids repeated thermal runaway, short circuits, and other failures, thereby improving the safety and reliability of the battery module.

[0009] The present application further provides a battery pack in which the case has a total pack pressure relief valve that is connected to the pressure relief outlet of the pressure relief assembly inside the case. Sprays from a thermal runaway battery cell enter the pressure relief chamber through the pressure relief inlet, are discharged through the pressure relief outlet to the position of the total pack pressure relief valve, and are then discharged to the outside of the battery pack by the total pack pressure relief valve. This prevents the thermal runaway battery cell from spraying sprays on other battery cells, other battery modules, and other components within the battery pack. The temperature of the thermal runaway sprays is reduced by contact with the cooling plate, preventing subsequent thermal runaway and failures such as short circuits, and significantly improving the thermal safety performance of the battery pack.

[0010] The electricity-using device according to the present invention can avoid dangerous accidents caused by thermal runaway of the battery pack, and is therefore safer to use. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a structural schematic diagram of a battery module according to an embodiment of the present application; [Figure 2] FIG. 1 is an exploded schematic view of a battery module according to an embodiment of the present application. [Figure 3] 1 is a first view of two pressure relief assemblies of a battery module according to an embodiment of the present application. FIG. [Figure 4] 1 is an exploded schematic view of a pressure relief assembly according to an embodiment of the present application. [Figure 5] FIG. 2 is a second view of two pressure relief assemblies of a battery module according to an embodiment of the present application. [Figure 6] 1 is a first view of a battery cell according to an embodiment of the present application. [Figure 7] FIG. 2 is a second view of the battery cell according to the embodiment of the present application. [Figure 8] FIG. 2 is an exploded schematic view of a cooling plate according to an embodiment of the present application. [Figure 9] FIG. 2 is a schematic diagram of refrigerant flow within a cold plate in one of the pressure relief assemblies according to embodiments of the present application. [Figure 10]FIG. 10 is a schematic diagram of refrigerant flow within a cold plate in another pressure relief assembly according to an embodiment of the present application. [Figure 11] 1 is a structural schematic diagram of a battery module according to an embodiment of the present application; [Figure 12] FIG. 2 is a first view of a battery cell block and two CCS assemblies according to an embodiment of the present application. [Figure 13] FIG. 2 is a second view of a battery cell block and two CCS assemblies according to an embodiment of the present application. [Figure 14] 1 is a structural schematic diagram of a battery cell block according to an embodiment of the present application; [Figure 15] FIG. 2 is an exploded schematic view of a busbar unit and a battery cell according to an embodiment of the present application. [Figure 16] FIG. 2 is an exploded schematic view of the busbar unit according to the embodiment of the present application. [Figure 17] FIG. 2 is a schematic diagram of a bus bar according to an embodiment of the present application. [Figure 18] 1 is a first connection schematic diagram of a busbar unit and a battery cell according to an embodiment of the present application. FIG. [Figure 19] FIG. 10 is a second schematic diagram illustrating a busbar unit and a battery cell connected to each other according to an embodiment of the present application. [Figure 20] FIG. 2 is a schematic diagram illustrating a connection between a busbar unit and a battery cell block according to an embodiment of the present application. [Figure 21] 1 is a structural schematic diagram of a bracket of a CCS assembly according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0012] The battery cells referred to in the embodiments of the present application may include, but are not limited to, lithium ion secondary battery cells, lithium ion primary battery cells, lithium sulfur battery cells, sodium ion battery cells, magnesium ion battery cells, etc. The battery cells may have a flat, rectangular, cylindrical, or other shape, etc., but are not limited to, the embodiments of the present application.

[0013] The battery module and battery pack referred to in the embodiments of this application are a single physical block that includes multiple battery cells to provide higher voltage and capacity. A battery pack generally includes a case configured to seal one or more battery cells, and the case can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0014] The present invention provides an electric device including a battery pack and an electric component, and the battery pack serves as a power supply system for the electric device to provide electric energy to the electric component for realizing corresponding functions. The electric device may be, but is not limited to, a power tool, an electric bicycle, an electric car, a steamship, a spacecraft, etc.

[0015] The battery packs described in the embodiments of the present application are 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 be described using one 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, a range-extended vehicle, etc. A battery pack is provided inside the vehicle, and may be provided at the bottom, head, or tail of the vehicle. The battery pack can be used to power the vehicle, for example, the battery pack can serve as an operating power source for the vehicle. The vehicle may further include a controller and a motor, and the controller is used to control the battery pack to power the motor, for example, to meet electrical needs for starting the vehicle, navigation, and operation while driving.

[0017] An embodiment of the present application provides a battery pack applicable to an electric device such as a vehicle, thereby reducing the cost of the electric device and improving production efficiency. The battery pack includes a case and at least one battery module disposed inside the case. The case is configured to provide a storage space for the battery module. For example, the case may include a first housing and a second housing that fit together, and the first housing and the second housing may be connected by bolts or welding.

[0018] The battery pack case is provided with a pressure relief valve for the entire pack, which allows the ejection of particles from within the battery cell in the event of thermal runaway in the battery cell, making it highly safe.

[0019] 1 and 2, this embodiment provides a battery module including at least one battery cell 210 and a pressure relief assembly 100. The pressure relief assembly 100 is configured to provide a pressure relief path for ejected material when the battery cell 210 experiences thermal runaway, and to guide the high-temperature ejected material to the outside of the battery pack.

[0020] For example, a plurality of battery cells 210 are arranged to form a battery cell block 200 .

[0021] 3, 4 and 5, which are structural schematic diagrams of a pressure relief assembly 100 according to this embodiment. The pressure relief assembly 100 includes a cooling plate 110 and an isolation assembly 120.

[0022] The cooling plate 110 is configured to be in direct or indirect contact with the battery cells 210 and cool the battery cells 210, and the isolation assembly 120 is located on the side of the cooling plate 110 facing away from the battery cells 210. The cooling plate 110 may cool the battery cells 210 by liquid cooling, air cooling, or direct cooling. For example, the cooling plate 110 is provided with a refrigerant flow path 111. The refrigerant flow path 111 is configured to circulate a refrigerant medium to lower the temperature of the battery cells 210. The refrigerant medium may be a liquid such as water, a salt solution, or liquid nitrogen, or a gas such as cold air or ammonia, as long as it flows within 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, through which high-temperature material ejected during thermal runaway of the battery cells 210 can enter. 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, through which the pressure relief inlet 112 communicates with the pressure relief outlet 1220 via the pressure relief chamber 130. The isolation assembly 120 serves to isolate the high-temperature ejected material and prevent it from being ejected onto other components within the battery pack.

[0024] 6 and 7, which are structural schematic diagrams of a cylindrical battery cell 210, the battery cell 210 is provided with a pressure relief structure 211, which faces and communicates with the pressure relief inlet 112 in the cooling plate 110. The battery cell 210 has a pressure relief end surface and a negative electrode end surface 214, which are opposite each other. A pole is provided on the pressure relief end surface, and the pressure relief structure 211 is also located in the area where the pressure relief end surface is located. The cylindrical side surface of the battery cell 210 is located between the pressure relief end surface and the negative electrode end surface 214. The pressure relief end surface and the negative electrode end surface 214 are usually also referred to as the top and bottom surfaces 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, as long as the pressure relief structure 211 in the battery cell 210 is directly opposite and communicates with the pressure relief inlet 112 in the cooling plate 110.

[0026] 3 and 5, the isolation assembly 120 and the cooling plate 110 are fitted together to define the pressure relief chamber 130. In the pressure relief assembly 100, the cooling plate 110 not only performs the function of thermal management of the battery cell 210, but also cooperates with the isolation assembly 120 to form the surrounding pressure relief chamber 130. When thermal runaway occurs in the battery cell 210, the hot gas, the electrode sheet of the battery cell, the electrolyte, and other jets of liquid ejected from the inside of 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 jets of liquid ejected in the pressure relief chamber 130 are further ejected to the battery module through the pressure relief outlet 1220. The thermal runaway fuel is discharged outside the battery module, thereby preventing the thermal runaway battery cell 210 from spraying thermal runaway fuel onto nearby battery cells 210 within the battery module. Furthermore, the cooling plate 110 forms a pressure relief passage for the battery module, which reduces the temperature of the fuel emitted during thermal runaway in the battery pack, thereby preventing the high temperature caused by the thermal runaway fuel from spreading to the surrounding area, thereby avoiding the occurrence of failures such as continuous thermal runaway and short circuits, and improving the safety and reliability of the battery module in use.

[0027] In some other embodiments, the isolation assembly 120 may be provided inside the cooling plate 110. In this case, the isolation assembly 120 itself is enclosed inside the cooling plate 110 to form the above-mentioned pressure relief chamber 130. In this embodiment, the isolation assembly 120 has a certain thermal conductivity, and after the thermal runaway jet enters the pressure relief chamber 130 formed by enclosing the isolation assembly 120, the isolation assembly 120 conducts the high temperature caused by the thermal runaway jet to the cooling plate 110 connected to the isolation assembly 120, which can also enable the cooling plate 110 to cool the thermal runaway jet.

[0028] In the battery pack of this embodiment, the overall pack pressure relief valve provided in the case is connected to the pressure relief outlet 1220 of the pressure relief assembly 100 inside the case. Spills from a thermally runaway battery cell 210 enter the pressure relief chamber 130 through the pressure relief inlet 112, are discharged through the pressure relief outlet 1220 to the overall pack pressure relief valve, and are then discharged outside the battery pack by the overall pack pressure relief valve. This prevents the thermally runaway battery cell 210 from spraying spills onto other battery cells 210, other battery modules, or other components within the battery pack. Contact with the cooling plate 110 reduces the temperature of the spills, preventing further thermal runaway, short circuits, and other failures. This significantly improves the thermal safety performance of the battery pack. An electrical device equipped with the battery pack can avoid dangerous accidents caused by thermal runaway in the battery pack and is safer to 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 jet of material in the pressure relief chamber 130 to flow out through the pressure relief outlet 1220 under the action of its own gravity, thereby preventing the high-temperature jet of 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, but rather a corresponding flow path may be provided within the battery pack to direct the hot jets 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 causes the high-temperature jet to tend to flow from top to bottom, and further prevents the high-temperature jet in the pressure relief chamber 130 from flowing back to the position of the pressure relief inlet 112 and damaging the battery cell block 200.

[0032] 3, 4, and 5, the isolation assembly 120 includes an insulating plate 121 and a seal 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 seal 122 being annularly disposed around the insulating plate 121 and sealingly connected between the cooling plate 110 and the insulating plate 121, thereby surrounding the cooling plate 110, the insulating plate 121, and the seal 122 to form the pressure relief chamber 130. This structure can ensure the formation of the pressure relief chamber 130 with a certain thickness, and the installation of the seal 122 can ensure good sealing of the pressure relief chamber 130 in the circumferential direction, so that high-temperature jets cannot leak through the gap between the insulating plate 121 and the seal 122 and the gap between the cooling plate 110 and the seal 122, but can only be discharged through the pressure relief outlet 1220.

[0033] The heat insulating plate 121 and the sealing material 122 may be integrally formed or may be separate from each other.

[0034] The pressure relief outlet 1220 is provided in the insulating plate 121 or the sealing material 122. When there is only one pressure relief assembly 100 in a battery module and the pressure relief assembly 100 is placed horizontally so that the insulating plate 121 is located at the bottom of the entire battery module, the pressure relief outlet 1220 may be provided in the insulating plate 121, so that the high-temperature jet of material is discharged through the bottommost pressure relief outlet 1220 under the action of gravity. When the pressure relief assembly 100 is placed vertically, as shown in FIG. 4 , the pressure relief outlet 1220 may be provided at the bottommost position of the sealing material 122, so that the high-temperature jet of material is discharged through the bottommost pressure relief outlet 1220 of the sealing material 122 under the action of gravity.

[0035] Of course, in other embodiments, the isolation assembly 120 may not be provided with the sealant 122 and may include only the insulating plate 121, in which case the insulating plate 121 and the cooling plate 110 alone may define the pressure relief chamber 130 described above.

[0036] As shown in FIG. 4, in some embodiments, the insulating plate 121 and / or the cooling plate 110 are provided with a support 140, which is supported between the insulating plate 121 and the cooling plate 110 and maintains a gap between the insulating plate 121 and the cooling plate 110, thereby forming a pressure relief chamber 130 with a certain space. At the same time, the installation of the support 140 can improve the strength of the entire pressure relief assembly 100, particularly the compressive strength of the insulating plate 121 and the cooling plate 110, and prevent deformation of the cooling plate 110 and the insulating plate 121.

[0037] For example, the support 140 is a support pillar attached to the heat insulating plate 121 or the cooling plate 110, and the cross section of the support pillar may be circular, rectangular, or of other shapes. A plurality of support pillars 140 may be provided, and distributed in the middle and both ends of the cooling plate 110 to improve the uniformity of support.

[0038] In some embodiments, the insulating plate 121 is made of a metal material, such as aluminum, aluminum alloy, stainless steel, copper, or copper alloy, and has high strength and good insulating ability, and can effectively block high-temperature jets, block high temperatures into the pressure relief chamber 130, and prevent the temperature from spreading to other battery modules and electronic components in the battery pack.

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

[0040] In some embodiments, the insulating plate 121 may be made of rubber, especially hard rubber, which ensures strength and at the same time provides excellent insulating properties.

[0041] Similarly, the material of the seal 122 may be metal, plastic, or rubber. For example, the seal 122 may be made of aluminum, aluminum alloy, stainless steel, copper, copper alloy, PBT, or hard rubber, which has high strength and good thermal insulation ability, and can prevent the seal 122 from being punctured by pressure when releasing pressure due to thermal runaway, thereby improving safety in use.

[0042] In this embodiment, the sealant 122 is a rubber ring, which ensures the sealing after the connection between the insulation plate 121 and the cooling plate 110, and at the same time has a certain earthquake and impact resistance function, which can prevent the connection between the insulation 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 material, which has high strength and strong thermal conductivity, and can improve the temperature drop rate of the battery cells 210.

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

[0045] In some embodiments, the insulating board may be covered on both sides with insulating layers to improve its insulating capacity, e.g., insulating layers made of silica fiber material.

[0046] 4, a channel protrusion 1140 is provided on the side of the cooling plate 110 facing the isolation assembly 120. The provision of the channel protrusion 1140 increases the area of ​​the cooling plate 110, increasing the contact area between the thermal runaway ejecta and the cooling plate 110 and improving the heat dissipation effect of the thermal runaway ejecta. Furthermore, the channel protrusion 1140 can also improve the strength of the cooling plate 110. At the same time, the channel protrusion 1140 can provide a certain support function and prevent the insulation plate 121 from being significantly deformed toward the cooling plate 110.

[0047] The installation of the flow path protrusion 1140 exerts a certain turbulence on the high-temperature jet in the pressure relief chamber 130, increasing the turbulence of the flow of the high-temperature jet and extending the flow time within the pressure relief chamber 130. This increases the contact time between the high-temperature jet and the cooling plate 110, contributing to improving the cooling effect of the high-temperature jet.

[0048] 8 , in this embodiment, the cooling plate 110 includes a flat plate 113 and a channel plate 114 that are placed over each other. The channel protrusions 1140 are provided on the channel plate 114, and channel grooves 1141 are formed on the side facing the flat plate 113. The refrigerant channels 111 are formed by the groove walls of the channel grooves 1141 surrounding the flat plate 113. That is, the channel plate 114 has a concave-convex plate structure, and the channel protrusions 1140 are formed by, for example, a press process, and the back surfaces of the channel protrusions 1140 are the channel grooves 1141. Because the 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 is in direct contact with the battery cell block 200 or indirect contact via a heat conductive medium, etc., thereby ensuring a large contact heat exchange area between the flat plate 1140 and the battery cell block 200 and improving the heat exchange effect. Furthermore, the adhesion between the flat plate 113 and the battery cell block 200 is good, preventing the presence of voids, ensuring that all high-temperature materials ejected by the pressure relief structure 211 of the battery cell 210 enter the pressure relief chamber 130 through the pressure relief inlet 112, and preventing leakage through the gap between the cooling plate 110 and the battery cell block 200.

[0049] 4, 9, and 10, the cooling plate 110 is provided with a refrigerant inlet 115 and a refrigerant outlet 116. The refrigerant inlet 115 is connected to the refrigerant outlet 116 via a refrigerant flow path 111. The refrigerant medium enters the refrigerant flow path 111 through the refrigerant inlet 115 and then exits through the refrigerant outlet 116, thereby realizing a circulating flow of the refrigerant medium within the refrigerant flow path 111. The refrigerant inlet 115 and the refrigerant outlet 116 are both configured to connect to corresponding refrigerant pipes. By locating the refrigerant inlet 115 and the refrigerant outlet 116 at the same end of the cooling plate 110, the refrigerant pipes can be installed at one end of the cooling plate 110. Therefore, only one side of the cooling plate 110 needs to be provided with space for the refrigerant pipes, which can reduce the size of the cooling plate 110 and the entire battery module.

[0050] As shown in FIGS. 9 and 10, the coolant medium flows in the coolant flow passages 111 of the cooling plate 110 in the direction indicated by the arrows.

[0051] For ease of explanation, the following description will be given by introducing the X, Y, and Z directions. In this embodiment, the battery cells 210 are cylindrical battery cells, of which the X direction is the axial direction of the battery cells 210, and the X, Y, and Z directions are perpendicular to each other two by two, and a plurality of battery cells 210 are arranged along both the Y and Z directions to form a battery cell block 200. Of course, the battery cells 210 may also be rectangular battery cells.

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

[0053] 2 and 12 , in some embodiments, the pressure relief structures 211 of the plurality of battery cells 210 in the battery cell block 200 are oriented in opposite directions, i.e., the pressure relief structures 211 of some of the battery cells 210 face one side, and the pressure relief structures 211 of some of the battery cells 210 face the other side. Two pressure relief assemblies 100 are provided, one on each side of the plurality of battery cells 210 in the X direction, providing a pressure relief path for the corresponding pressure relief structure 211, so that any ejection of fuel from any of the battery cells 210 during thermal runaway can be discharged through the pressure relief outlet 1220 of the corresponding pressure relief assembly 100.

[0054] In other words, when the pressure relief structures 211 of multiple cylindrical battery cells are oriented in different directions, two pressure relief assemblies 100 are located at both ends along the axial direction of the cylindrical battery cells, so that 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 is provided on either side of the battery cell block 200 where the pressure relief structure 211 is located, and the number of pressure relief assemblies 100 is not limited here.

[0056] 12 and 14, in the above embodiment, 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 pressure relief structures 211 of the first battery cell unit and the pressure relief structures 211 of the second battery cell unit are oriented in opposite directions. For example, in the orientation shown in FIG. 14, the pressure relief end surface of the first battery cell unit faces upward, and the negative electrode end surface 214 of the second battery cell unit faces upward. The first battery cell units and the second battery cell units are arranged alternately in multiple order, with at least one first battery cell unit and at least one second battery cell unit provided along the Y direction, with the first battery cell unit and the second battery cell unit being distributed alternately in sequential order, and with at least one first battery cell unit and at least one second battery cell unit provided along the Z direction, with the first battery cell unit and the second battery cell unit being distributed alternately in sequential order. In this way, the multiple battery cells 210 in the battery cell block 200 are first connected in parallel and then connected in series.

[0057] Each of the two pressure relief assemblies 100 has a plurality of pressure relief inlets 112, and the plurality of pressure relief inlets 112 of one of the pressure relief assemblies 100 face directly to the plurality of first battery cell units, and its refrigerant flow path 111 faces directly to the second battery cell unit so that the refrigerant medium flows over the negative electrode end surface 214 of the second battery cell unit to lower its temperature, while the plurality of pressure relief inlets 112 of the other pressure relief assembly 100 face directly to the plurality of second battery cell units, and its refrigerant flow path 111 faces directly to the first battery cell unit so that the refrigerant medium flows over the negative electrode end surface 214 of the first battery cell unit to lower its temperature.

[0058] That is, in the pressure relief assembly 100 that provides a pressure relief passage for the first battery cell unit, the cooling plate 110 is provided with one pressure relief inlet 112 corresponding to each first battery cell unit, i.e., the 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 for the second battery cell unit, the cooling plate 110 is provided with one pressure relief inlet 112 corresponding to each second battery cell unit, i.e., 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 connects to the refrigerant flow passage 111 of the cooling plate 110. The use of the elastic tube not only enables the flow of refrigerant medium between the two cooling plates 110, but also allows elastic deformation due to the elasticity of the elastic tube, thereby absorbing assembly tolerances when stacking the battery cell blocks and adapting to the installation tolerances of the two pressure relief assemblies 100.

[0061] 1, 2 and 3, two elastic tubes are provided, the two elastic tubes being respectively a first communicating tube 300 and a second communicating tube 400, the first communicating tube 300 connecting the refrigerant inlets 115 of the cooling plates 110 of the two pressure relief assemblies 100, and the second communicating tube 400 connecting the refrigerant outlets 116 of the cooling plates 110 of the two pressure relief assemblies 100, thereby realizing communication between the cooling plates 110 of the two pressure relief assemblies 100 and allowing the refrigerant medium to be injected from one cooling plate 110 into another cooling plate 110, eliminating the need for a pipe arrangement structure, making the structure simpler and occupying less space.

[0062] 1, 2, and 3, a first pipe fitting 150 and a second pipe fitting 160 are provided on the insulating plate 121 of one of the pressure relief assemblies 100, the first pipe fitting 150 being configured to connect to an inlet pipe for injecting a 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 passing through the insulating plate 121 communicate with the cooling plate 110 of the other of the pressure relief assemblies 100. A third pipe fitting 170 and a fourth pipe fitting 180 are provided on the cooling plate 110 of the other of the pressure relief assemblies 100, the third pipe fitting 170 being connected to a refrigerant inlet 115 of the cooling plate 110, and the fourth pipe fitting 180 being connected to a refrigerant outlet 116 of the cooling plate 110. The above-mentioned first pipe fitting 150 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 realizing communication between the cooling plates 110 in the two pressure relief assemblies 100.

[0063] In some embodiments, the first communicating pipe 300 and the second communicating pipe 400 are both bellows pipes, which can effectively absorb stacking tolerances between battery modules and simultaneously ensure the tightness of the connection points between the two cooling plates 110.

[0064] In this embodiment, the X direction and the bottom plate of the battery pack case form 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, the axis of the cylindrical battery cell and the bottom plate of the case form 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 may be 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, the two pressure relief assemblies 100 are arranged vertically, and the pressure relief outlets 1220 are arranged downward, allowing high-temperature jets of water in the pressure relief chamber 130 to be discharged through the pressure relief outlets 1220 under the force of gravity and ultimately discharged through the entire pack pressure relief valve in the case.

[0065] 2 and 11 , the battery module further includes a cell contact system (CCS) assembly 500, which includes a bracket 510, a busbar unit 520, and a collection unit 530. The busbar unit 520 and the collection unit 530 are both attached to the bracket 510. The busbar unit 520 is electrically connected to the battery cells 210, and electrical conductivity is achieved by, for example, welding. The collection unit 530 is electrically connected to the busbar unit 520 and configured to collect voltage and temperature signals of the battery cell block 200.

[0066] 12 and 13, the bracket 510 is provided with a profiling portion 511 that fits the battery cell 210, and the battery cell 210 is positioned and fixed by fitting the battery cell 210 into the profiling portion 511. The bracket 510 also serves as a mounting carrier for the busbar unit 520 and the collecting unit 530, and as a carrier for the battery cell block 200, which simplifies the structure of the battery module, greatly improves production efficiency, and at the same time greatly reduces the material costs 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 each side of the battery cell block 200 in the X direction. Referring to FIGS. 12 and 13 , each of the brackets 510 of the two CCS assemblies 500 is provided with a profiling portion 511 that corresponds one-to-one with the battery cells 210. During the stacking process, the battery cells 210 are aligned according to the profiling portions 511 on the brackets 510 of the CCS assemblies 500, thereby completing the stacking of the battery cell blocks 200. After the stacking is complete, the busbar units 520 and other components of the CCS assemblies 500 are welded, and then the cooling plates 110 of the pressure relief assemblies 100 on both sides are connected to one side of the corresponding CCS assemblies 500, which simplifies the forming process and improves the efficiency of the stacking process.

[0069] Since the brackets 510 of the CCS assemblies 500 on both sides are provided with tracing portions 511 (tracing holes in this embodiment), the brackets 510 of the CCS assemblies 500 on both sides can directly support the battery cells 210 in the lateral direction, eliminating the need to use a tray to restrict the position of the multiple battery cells 210. This reduces the number of parts used in the battery module assembly process, simplifies the battery module assembly process, and reduces the size of the battery module in the X direction, making the battery module structure more compact, reducing the space it occupies, and improving energy density.

[0070] The bracket 510 is illustratively made of a plastic material.

[0071] In this embodiment, the CCS assembly 500 is a fully integrated block, i.e., the bracket 510, the busbar unit 520, and the collection unit 530 can be assembled together first to form the complete CCS assembly 500, which allows for overall loading and faster tact time.

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

[0073] In some embodiments, a thermally conductive 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 achieve rapid temperature reduction of the busbar unit 520 and the battery cell 210. The thermally conductive medium is, for example, a thermally conductive structural adhesive. Because the refrigerant flow path 111 faces the negative electrode end surface 214 of the battery cell 210, the cooling position is the negative electrode of the battery cell, and the heat conduction path is from the cooling plate 110 to the thermally conductive structural adhesive, then to the busbar unit 520 in the CCS assembly 500, and then to the negative electrode of the battery cell 210.

[0074] 15, which is a structural schematic diagram of a busbar unit 520 and a battery cell 210 according to this embodiment. In combination with FIG. 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 simultaneously provided at one end of the battery cell 210.

[0075] 16, bus bar unit 520 includes bus bar 521 and insulating and heat-insulating portion 522. Bus bar 521 is made of a metal material such as aluminum, aluminum alloy, copper, or copper alloy and has good electrical conductivity, while insulating and heat-insulating portion 522 may be made of a non-metallic material having good insulating and heat-resistant properties.

[0076] 17, the bus bar 521 includes a conductive portion 5211 and a first connecting portion 5212 connected to each other, and the first connecting portion 5212 is 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 by, for example, laser welding. Referring to FIG. 18, the insulating and heat-insulating portion 522 includes a first insulating and heat-insulating film 5221, which covers the side of the conductive portion 5211 facing the battery cell 210 and faces the pressure relief structure 211, and the pressure relief structure 211 is separated from the conductive portion 5211 by the first insulating and heat-insulating film 5221.

[0077] By providing the first insulating and heat-insulating film 5221 on the side of the conductive part 5211 of the bus bar 521 facing the battery cell 210, the insulating blocking action of the first insulating and heat-insulating film 5221 causes the ejected material to be ejected onto the first insulating and heat-insulating film 5221 when thermal runaway occurs in the battery cell 210, preventing the ejected material from directly contacting the battery cell 210 and the bus bar 521 and causing a short circuit, and also preventing high temperatures from spreading to the bus bar 521, thereby improving the safety and reliability of the battery pack.

[0078] Illustratively, the electrode area 212 is 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 provided with the positive electrode area, the negative electrode area 213, and the pressure relief structure 211 all at once. When the first connection portion 5212 of the busbar 521 is connected to the positive electrode area, the first insulating and 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 and 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 prevent the positive electrode area and the negative electrode area 213 from being electrically connected to the busbar 521 at the same time, which would cause a short circuit, and it is also possible to isolate high-temperature jets of material ejected from the pressure relief structure 211.

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

[0080] 15 and 19, the insulating and heat-insulating part 522 preferably further includes a second insulating and heat-insulating film 5222, which is disposed on the side of the conductive part 5211 facing away from the battery cell 210. The second insulating and heat-insulating film 5222 isolates and blocks thermal runaway particles from the battery cell 210 toward the side of the conductive part 5211 facing away from the battery cell 210, preventing the battery cell 210 from being directly electrically connected to the back surface of the bus bar 521 by the conductive thermal runaway particles, thereby avoiding the occurrence of a short circuit and preventing high temperatures due to thermal runaway from spreading to the bus bar 521.

[0081] 18 , the insulating and heat-insulating part 522 further includes a connecting film 5223, which connects the first insulating and heat-insulating film 5221 and the second insulating and heat-insulating film 5222 on both sides of the conductive part 5211, and which covers the side edges of the conductive part 5211. That is, the insulating and heat-insulating part 522 completely covers both sides and edges of the conductive part 5211, thereby preventing thermal runaway particles from being directly conductively connected to the bus bar 521 in all directions and preventing high temperatures caused by the thermal runaway particles from spreading to the bus bar 521, preventing the temperature of the bus bar 521 from rising too high, and improving the operational safety and reliability of the battery pack.

[0082] In some embodiments, the first insulating and thermal insulating film 5221 and / or the second insulating and thermal insulating film 5222 and / or the connecting film 5223 are adhered to the conductive part 5211, making the connection strong, convenient, and reliable. In this embodiment, the first insulating and thermal insulating film 5221, the second insulating and thermal insulating film 5222, and the connecting film 5223 are all adhered to the conductive part 5211. For example, the first insulating and thermal insulating film 5221, the second insulating and thermal insulating film 5222, and the connecting film 5223 are provided with adhesive, and after the entire insulating and thermal insulating part 522 and the conductive part 5211 of the bus bar 521 are tightly attached together, a hot pressing process is used to melt the adhesive in the insulating and thermal insulating part 522 at a high temperature, thereby firmly bonding the insulating and thermal insulating part 522 and the conductive part 5211 of the bus bar 521 together.

[0083] The first insulating and heat insulating film 5221 and / or the second insulating and heat insulating film 5222 and / or the connecting film 5223 are polyimide (PI) films or mica paper films. For example, the first insulating and heat insulating film 5221, the second insulating and heat insulating film 5222 and the connecting film 5223 are all PI films, i.e., the entire insulating and heat insulating part 522 is made of PI film, which has excellent high temperature resistance and electrical insulation properties, and can effectively block the positive electrode area 213 and the negative electrode area 213 from being electrically connected to the bus bar 521 at the same time and effectively isolate thermal runaway jets. Alternatively, the first insulating and heat-insulating film 5221, the second insulating and heat-insulating film 5222 and the connecting film 5223 are all made of mica paper, that is, the entire insulating and heat-insulating part 522 is made of mica paper, which can be used in an environment of 500 degrees Celsius, can effectively isolate thermal runaway jets, prevent high-temperature diffusion, and has good insulation 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 and thermal insulating film 5221 and / or the second insulating and thermal insulating 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 and thermal insulating film 5221 and / or the second insulating and thermal insulating film 5222 and / or the connecting film 5223 may be in the range of 0.1 mm or more and 0.3 mm or less. An insulating and thermal insulating part 522 of this thickness ensures effective isolation between the negative electrode area 213 (or the positive electrode area) and the conductive part 5211 and can prevent the insulating and thermal insulating part 522 from being pierced and destroyed by the action of the ejection pressure of the ejected matter caused by thermal runaway of the battery cell 210, without being too thin and increasing material costs. For example, the first connection part 5212 is connected to the positive electrode area, and for some cylindrical battery cell models, the positive electrode area and the negative electrode area 213 are in the same plane. If the first insulating and heat-insulating film 5221 is made too thick, the first insulating and heat-insulating film 5221 will be interposed between the negative electrode area 213 and the conductive part 5211, resulting in a gap between the first connection part 5212 and the positive electrode area, which will increase the difficulty of welding.

[0085] For example, the first insulating and thermal insulating film 5221, the second insulating and thermal insulating film 5222 and the connecting film 5223 may have the same thickness, and the thickness 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 FIGS. 6 and 7 , where the electrode area 212 is a positive electrode area, and the negative electrode area 213 is annularly arranged around the positive electrode area, with the negative electrode area 213 and the positive electrode area being on the same end surface of the battery cell 210. The negative electrode end surface 214 and the positive electrode area of ​​the cylindrical battery cell are respectively provided at both ends of the cylindrical battery cell along the axial direction of the cylindrical battery cell. As shown in FIG. 17 , the busbar 521 further includes a second connection portion 5213, and the second connection portion 5213 and the first connection portion 5212 are respectively provided on opposite sides of the conductive portion 5211. The busbar 521 can connect two cylindrical battery cells that are oriented in opposite directions via the first connection portion 5212 and the second connection portion 5213. The first connection portion 5212 is connected to the positive electrode area of ​​one of the battery cells 210 , and the second connection portion 5213 is electrically connected to the negative electrode end surface 214 of another of the battery cells 210 .

[0087] The electrode area 212 is circular, and 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 and thermal insulating film 5221 and / or the second insulating and thermal insulating film 5222, and the first arc-shaped edge 5221a is surrounded by the electrode area 212, i.e., surrounded outside the positive electrode area. The first arc-shaped edge 5221a may be provided on one side of both the first insulating and thermal insulating film 5221 and the second insulating and thermal insulating film 5222, or the first arc-shaped edge 5221a may be provided on one side of the first insulating and thermal insulating film 5221 or the second insulating and thermal insulating film 5222. The negative electrode end surface 214 also has a circular shape, and a second arc-shaped side 5221b is provided on both the side of the first insulating and thermal insulating film 5221 facing away from the first connection portion 5212 and / or the side of the second insulating and thermal insulating film 5222 facing away from the first connection portion 5212, and the second arc-shaped side 5221b is surrounded by the outside of the negative electrode end surface 214. The second arc-shaped side 5221b may be provided on both the first insulating and thermal insulating film 5221 and the second insulating and thermal insulating film 5222, or the second arc-shaped side 5221b may be provided on only one of the first insulating and thermal insulating film 5221 and the second insulating and thermal insulating film 5222. The shape and size of the first arc-shaped side 5221a fit the outer contour of the positive electrode area, and the second arc-shaped side 5221b fit the outer contour of the negative electrode end face 214. By providing the first arc-shaped side 5221a that is enclosed outside the positive electrode area and the second arc-shaped side 5221b that is enclosed outside the negative electrode end face 214, the first insulating and heat-insulating film 5221 and the second insulating and heat-insulating film 5222 can cover as much of the bus bar 521 as possible, that is, the entire conductive portion 5211, thereby protecting as much of the bus bar 521 as possible from direct contact with jets of thermal runaway. As shown in FIG. 17 , the area indicated by the dotted line is the conductive portion 5211, and the first insulating and heat-insulating film 5221 and the second insulating and heat-insulating film 5222 can be arranged within the range defined by the dotted line.

[0088] 19 and 20, one bus bar 521 can connect two rows of battery cells 210 with poles oriented in different directions, the two rows of battery cells 210 being a first battery cell unit and a second battery cell unit, respectively, each of which includes 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 direction, Y direction, and Z direction are perpendicular to each other.

[0089] In the first battery cell unit and the second battery cell unit, the orientation of the battery cells 210 is opposite. 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 in the Z direction, and of these, the first connection portion 5212 and the second connection portion 5213 are both provided in plurality along the Y direction, and the plurality of first connection portions 5212 correspond one-to-one to the plurality of battery cells 210 of the first battery cell unit, and the plurality of second connection portions 5213 correspond one-to-one to the plurality of battery cells 210 of the second battery cell unit. The multiple first connection portions 5212 are connected to the multiple positive electrode areas in the first battery cell unit in a one-to-one correspondence, the negative electrode area 213 and the conductive portion 5211 in the first battery cell unit are isolated from each other by a first insulating and heat-insulating film 5221, and the multiple second connection portions 5213 are connected to the multiple negative electrode end faces 214 in the second battery cell unit in a one-to-one correspondence. The first insulating and heat-insulating film 5221 and the second insulating and heat-insulating film 5222 both extend along the Y direction, thereby providing isolation between the negative electrode area 213 of each battery cell 210 and the bus bar 521, and also providing isolation against ejections of thermal runaway from each battery cell 210.

[0090] The first connection portion 5212 is provided to protrude from one side of the conductive portion 5211, is nearly circular, and fits the shape and size of the positive electrode area. A groove is formed between two adjacent first connection portions 5212, and the bottom wall of the groove is the side edge of the conductive portion 5211, which is covered with a connecting film 5223. Both ends of the first insulating and heat insulating film 5221 in the Y direction are connected to the second insulating and heat insulating film 5222 by the connecting film 5223, thereby covering both sides of the conductive portion 5211 in the Y direction.

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

[0092] Referring to FIG. 21 , a busbar engagement groove 512 is provided on the side of bracket 510 facing away from battery cell 210. Busbar engagement groove 512 is configured to receive and engage busbar unit 520, and the shape and size of busbar engagement groove 512 are adapted to the shape and size of busbar 521, thereby positioning and fixing busbar unit 520.

[0093] If the bus bar 521 is connected only to the negative electrode end surface 214 but not to the positive electrode area, there is no need to provide the insulating and heat-insulating part 522, as in the case of the negative electrode output stage bus bar 521 shown in the lower left corner of Fig. 11. If the bus bar 521 is connected only to the positive electrode area but not to the negative electrode end surface 214, there is no need to provide the second connecting part 5213, and the side facing away from the first arc-shaped side 5221a of the first insulating and heat-insulating film 5221 and the second insulating and heat-insulating film 5222 may be a straight side, as in the case of the positive electrode output stage bus bar 521 shown in the lower right corner of Fig. 11, for example.

[0094] 11 is a long series-connection busbar connected to one first battery cell unit and one second battery cell unit arranged along the Y direction. Correspondingly, the busbar 521 has one row of first connection portions 5212 and one row of second connection portions 5213 arranged along the Y direction, with the one row of first connection portions 5212 connected to the positive electrode areas of the first battery cell units and the one row of second connection portions 5213 connected to the negative electrode areas 213 of the second battery cell units. In the long series-connection busbar, insulating and heat-insulating portions 522 only need to be provided in the corresponding region facing the first battery cell units, and do not need to be provided in the region facing the second battery cell units.

[0095] 11 and 13, the acquisition unit 530 includes an acquisition circuit board 531, a voltage acquisition strip 532, and a connector 533. The acquisition circuit board 531 is, for example, an FPC flexible circuit board, to which a plurality of voltage acquisition strips 532 are connected. The voltage acquisition strips 532 are electrically connected to the bus bar 521 to acquire voltage signals. The connector 533 is electrically connected to one end of the acquisition circuit board 531 as a data acquisition output interface. [Explanation of symbols]

[0096] 100···Pressure relief assembly, 200···Battery cell block, 300···First communicating pipe, 400···Second communicating pipe, 500···CCS assembly, 110 cooling plate, 120 isolation assembly, 130 pressure relief chamber, 140 support, 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....Insulating plate, 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 surface; 215: Cylindrical side surface; 510···Bracket, 520···Busbar unit, 530···Collecting unit, 511.... Copying portion, 512.... Bus bar engagement groove, 521... Bus bar, 522... Insulating and heat-insulating part, 5211... Conductive part, 5212... First connection part, 5213... Second connection part, 5214... Positioning hole, 5221: First insulating and heat-insulating film, 5222: Second insulating and heat-insulating film, 5223: Connecting film, 5221a...first arc side, 5221b...second arc side, 531···Acquisition circuit board, 532···Voltage acquisition strip, 533···Connector.

Claims

1. a cooling plate (110) configured to cool the battery cells (210) and provided with a pressure relief inlet (112); an isolation assembly (120) connected to the cooling plate (110) to define a pressure relief chamber (130) and provided with a pressure relief outlet (1220) communicating with the pressure relief inlet (112) through the pressure relief chamber (130); Pressure relief assembly.

2. The isolation assembly (120) comprises: an insulating plate (121) configured to insulate the pressure relief chamber (130) from the outside, spaced apart from the cooling plate (110), and defining the pressure relief chamber (130) between the insulating plate (121) and the cooling plate (110); The pressure relief assembly of claim 1 .

3. At least one of the heat insulating plate (121) and the cooling plate (110) is provided with a support material (140), and the support material (140) is supported between the heat insulating plate (121) and the cooling plate (110). The pressure relief assembly of claim 2 .

4. a seal (122) hermetically connected between the cooling plate (110) and the heat insulating plate (121); The cooling plate (110), the heat insulating plate (121), and the seal (122) are surrounded to form the pressure relief chamber (130), and the pressure relief outlet (1220) is provided in the heat insulating plate (121) or the seal (122). The pressure relief assembly of claim 2 .

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

6. 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 of claim 1 .

7. The cooling plate (110) has a channel protrusion (1140) on the side facing the isolation assembly (120). The pressure relief assembly of claim 1 .

8. The cooling plate (110) comprises a flat plate (113) and a flow path plate (114) that overlap each other, the flow path plate (114) being located between the flat plate (113) and the isolation assembly (120), the flow path protrusions (1140) being provided on the side of the flow path plate (114) facing away from the flat plate (113), and flow path grooves (1141) being formed on the side facing the flat plate (113).

8. The pressure relief assembly of claim 7.

9. 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 8, wherein the pressure relief structure (211) is in communication with the pressure relief inlet (112); Battery module.

10. A plurality of the battery cells (210) are provided, and the pressure relief structures (211) of the plurality of the battery cells (210) are provided so as to be spaced apart along the X direction. At least two of the pressure relief assemblies (100) are provided, and the at least two pressure relief assemblies (100) are provided on both sides of the plurality of the battery cells (210) along the X direction. The battery module according to claim 9 .

11. a flexible tube that communicates the cooling plates (110) of the two pressure relief assemblies (100) and is deformable to accommodate the installation tolerances of the pressure relief assemblies (100); The battery module according to claim 10.

12. a plurality of battery cells (210) are arranged side by side to form a first battery cell unit, a plurality of battery cells (210) are arranged side by side to form a second battery cell unit, the pressure relief structure (211) of the first battery cell unit and the pressure relief structure (211) of the second battery cell unit are oriented in opposite directions, and the first battery cell unit and the second battery cell unit are arranged alternately in multiple positions; The two pressure relief assemblies (100) each have a plurality of pressure relief inlets (112), the plurality of pressure relief inlets (112) of one of the pressure relief assemblies (100) facing directly toward the plurality of first battery cell units, and the plurality of pressure relief inlets (112) of the other of the pressure relief assemblies (100) facing directly toward the plurality of second battery cell units. The battery module according to claim 10.

13. The angle α between the X direction and the bottom plate of the battery pack is set, and the range of α is 0 to 15°. The battery module according to claim 12.

14. The battery cell (210) is a cylindrical battery cell, and the two pressure relief assemblies (100) are located at both ends of the cylindrical battery cell along the axial direction. The battery module according to claim 9 .

15. a busbar unit (520) configured to electrically connect to the battery cell (210); The cooling plate (110) is located on a side of the busbar unit (520) facing away from the battery cells (210) and is in direct or indirect contact with the busbar unit (520). The battery module according to claim 9 .

16. 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 busbar unit includes: a bus bar (521) having a conductive portion (5211) and a first connection portion (5212) electrically connected to the electrode area (212); an insulating and heat-insulating part (522) including a first insulating and heat-insulating film (5221) that covers the side of the conductive part (5211) facing the battery cell (210) and faces the pressure relief structure (211), and the pressure relief structure (211) is separated from the conductive part (5211) by the first insulating and heat-insulating film (5221); The battery module according to claim 15.

17. The insulating and heat-insulating portion (522) further includes a second insulating and heat-insulating film (5222) that covers the conductive portion (5211) on the side facing away from the battery cell (210). The battery module according to claim 16.

18. The insulating and heat-insulating portion (522) further includes 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 17.

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

20. At least one of the first insulating and heat-insulating film (5221), the second insulating and 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 18.

21. The thickness of at least one of the first insulating and heat insulating film (5221), the second insulating and 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 18.

22. The electrode area (212) has a circular shape, and at least one side of the first insulating and heat insulating film (5221) and the second insulating and heat insulating film (5222) has a first arc-shaped side (5221a) surrounded by the electrode area (212). The battery module according to claim 17.

23. The battery pack further includes a bracket (510) to which the busbar unit (520) is attached and which has a matching portion (511) that fits the battery cell (210), The battery cell (210) and the profiling portion (511) are fitted together. The battery module according to claim 15.

24. The busbar unit (520) and the bracket (510) are provided on both sides of the battery cell (210). The battery module of claim 23.

25. a case provided with a pack-wide pressure relief valve; and at least one battery module according to claim 9 provided in the case, wherein the pack-wide pressure relief valve is in communication with the pressure relief outlet (1220); Battery pack.

26. an electrical component; and the battery pack of claim 25 configured to provide electrical energy to the electrical component. Electrical usage devices.

Images