Battery module and electric device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TSINGHUA SHENZHEN INTERNATIONAL GRADUATE SCHOOL
- Filing Date
- 2025-08-12
- Publication Date
- 2026-07-14
Smart Images
Figure CN224502200U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of energy storage technology, and in particular to a battery module and electrical equipment. Background Technology
[0002] In traditional battery modules, cooling plates are usually placed at the ends of the cell assembly, and the coolant in the cooling plate exchanges heat with the cell assembly through the plate material, resulting in low heat dissipation efficiency. Utility Model Content
[0003] In view of the above situation, this application provides a battery module to solve the above problems.
[0004] This application provides a battery module including a cell assembly and a cooling plate. The cell assembly includes multiple individual cells, each cell including a housing and an electrode post extending from one side of the housing. The cooling plate includes a top wall, a bottom wall, a side wall, a first seal, and a second seal. The top wall and bottom wall are spaced apart along a first direction, and the side wall connects the top wall and bottom wall to form a receiving cavity containing coolant. The top wall has a first orifice, and the bottom wall has a second orifice. Each individual cell passes through a corresponding first orifice and second orifice. The portion of the electrode post extending out of the housing is located on the side of the top wall away from the bottom wall or on the side of the bottom wall away from the top wall. The first seal is located between the first orifice and the housing, and the top wall is sealed to the individual cell via the first seal. The second seal is located between the second orifice and the housing, and the bottom wall is sealed to the individual cell via the second seal. The side wall has an inlet and an outlet communicating with the receiving cavity. The inlet is configured to inject coolant, and the outlet is configured to discharge coolant.
[0005] In the aforementioned battery module, the top wall is sealed to the individual battery cells via a first sealing element, and the bottom wall is sealed to the individual battery cells via a second sealing element, thus forming a closed space within the housing. The portion of the housing located within the housing is in direct contact with the coolant to improve heat dissipation efficiency. Furthermore, this design reduces the risk of coolant leakage when the battery module is tilted. The terminals extending from the housing are positioned on either the side of the top wall away from the bottom wall or the side of the bottom wall away from the top wall, isolating the terminals from the coolant, reducing the risk of short circuits, and thus improving the safety performance of the battery module. The inlet and outlet are used to replace the coolant within the housing, thereby dissipating heat from the battery cells through the flowing coolant and improving heat dissipation efficiency.
[0006] In some embodiments of this application, along the first direction, the length of the shell is H1, and the distance between the first orifice and the second orifice is H2, 50%≤H2 / H1≤100%, so as to increase the heat exchange area between the shell and the coolant, and to facilitate the coolant to dissipate heat to the easily heated area in the middle of the shell, thereby improving the heat dissipation efficiency.
[0007] In some embodiments of this application, the inlet is positioned lower than the outlet along the first direction, which is the direction of gravity. This allows the coolant to fully fill the cavity, increasing the heat exchange area between the casing and the coolant and improving heat dissipation efficiency.
[0008] In some embodiments of this application, the sidewall includes a first wall and a second wall spaced apart along a second direction, and a third wall and a fourth wall spaced apart along a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other. The distance between the first wall and the second wall along the second direction is greater than the distance between the third wall and the fourth wall along the third direction, so as to facilitate the accommodating cavity to accommodate the battery cell assembly. Viewed along the first direction, the distance between two adjacent battery cells is D1, and the minimum distance between the battery cell and the sidewall is D2, where D2 < D1, to optimize the distribution of coolant, facilitate the guidance of more coolant to contact the battery cell casing, and improve the overall heat dissipation uniformity.
[0009] In some embodiments of this application, the first wall is provided with a liquid inlet and the second wall is provided with a liquid outlet. Multiple battery cells are spaced apart along a second direction, and the thickness direction of the battery cells is parallel to the third direction. Along the third direction, the distance between two adjacent battery cells is D3, where 1mm≤D3≤10mm, to facilitate coolant flow and reduce space waste caused by excessive spacing between battery cells.
[0010] In some embodiments of this application, the third wall is provided with a liquid inlet and the fourth wall is provided with a liquid outlet. Multiple battery cells are spaced apart along the second direction, and the thickness direction of the battery cells is parallel to the second direction. Along the second direction, the distance between two adjacent battery cells is D4, where 1mm≤D4≤10mm, to facilitate coolant flow and reduce space waste caused by excessive spacing between battery cells.
[0011] In some embodiments of this application, the housing includes a body layer and an insulating layer covering the body layer. The thickness of the insulating layer is T1, where 10 μm ≤ T1 ≤ 200 μm. The insulating layer is doped with thermal conductivity enhancing filler, which includes at least one of alumina, boron nitride, or silica micropowder, so as to facilitate the formation of an effective heat conduction path with the coolant.
[0012] In some embodiments of this application, the insulating layer includes a first layer and a second layer disposed sequentially from the inside out, wherein the water vapor permeability of the first layer is less than or equal to 1×10⁻⁶. -10 The first layer is a water-resistant layer to improve electrical isolation. The second layer is a hydrophobic layer to reduce the risk of coolant infiltration. The absorbency of the first layer is g·cm / (cm²·s·Pa), and the second layer is less than or equal to 0.2%.
[0013] In some embodiments of this application, the top wall, bottom wall, and side wall are integrally formed to improve the structural strength of the cooling plate.
[0014] In some embodiments of this application, the electrical device includes the battery module in any of the above embodiments.
[0015] In the aforementioned battery module and electrical equipment, the top wall is sealed to the individual battery cells via a first sealing element, and the bottom wall is sealed to the individual battery cells via a second sealing element, thus forming a closed space within the housing. The portion of the housing located within the housing directly contacts the coolant to improve heat dissipation efficiency. Furthermore, this design reduces the risk of coolant leakage when the battery module is tilted. The terminals extending from the housing are positioned on either the side of the top wall away from the bottom wall or the side of the bottom wall away from the top wall, isolating the terminals from the coolant, reducing the risk of short circuits, and thus improving the safety performance of the battery module. The inlet and outlet are used to replace the coolant within the housing, thereby dissipating heat from the battery cells through the flowing coolant and improving heat dissipation efficiency. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the battery module structure in one embodiment of this application.
[0017] Figure 2 This is an exploded view of a battery module in one embodiment of this application.
[0018] Figure 3 This is a schematic diagram of the structure of the battery module housing in one embodiment of this application.
[0019] Figure 4 This is a schematic diagram of the first arrangement of the battery cells in a battery module according to one embodiment of this application.
[0020] Figure 5 This is a schematic diagram of the second arrangement of the battery cell units in one embodiment of this application.
[0021] Figure 6 This is a schematic diagram of the structure of the circulation component of the battery module in one embodiment of this application.
[0022] Figure 7 This is a schematic diagram of the structure of an electrical device in one embodiment of this application.
[0023] Explanation of main component symbols
[0024] Battery Module 100
[0025] 200 electrical appliances
[0026] Battery pack 10
[0027] 11 cells
[0028] Casing 111
[0029] Top surface 1111
[0030] Pressure relief mechanism 1112
[0031] Bottom 1113
[0032] Body layer 111A
[0033] Insulation layer 111B
[0034] First floor 111B1
[0035] Second floor 111B2
[0036] pole column 112
[0037] Pressure relief mechanism 113
[0038] Cooling plate 20
[0039] Reception cavity 20A
[0040] First opening 20B
[0041] Top Wall 21
[0042] First orifice 21A
[0043] Bottom wall 22
[0044] Second orifice 22A
[0045] Side wall 23
[0046] Inlet 23A
[0047] Outlet 23B
[0048] First Wall 231
[0049] Second Wall 232
[0050] The Third Wall 233
[0051] Fourth Wall 234
[0052] First seal 24
[0053] Second seal 25
[0054] Loop component 30
[0055] Liquid pump 31
[0056] First liquid tube 311
[0057] Second liquid tube 312
[0058] Radiator 32
[0059] First direction Z
[0060] Second direction X
[0061] Third direction Y
[0062] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation
[0063] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0064] It should be noted that when one component is considered to be "connected" to another component, it can be directly connected to the other component or there may be components positioned in between. When one component is considered to be "set" on another component, it can be directly set on the other component or there may be components positioned in between. It should be understood that, considering the factors of actual processing tolerances, in the technical solution of this application, when two components are set parallel / perpendicularly, they are set in the same direction, and there may be a certain angle between the two components. The angle between the two components is allowed to have a tolerance of 0-±10%. When one value is considered to be "equal" to another value, it means that the two are equal within a set deviation range, which is within 10%. That is to say, when at least one of the two values fluctuates within the set deviation range, even if their values are not equal, they are still judged to be approximately equal. In the technical solution of this application, the term "sealed connection" refers to the joining method between two or more components, which prevents fluid (gas, liquid) or particulate matter from leaking through the connection through physical structure or material properties, while meeting the pressure, temperature or chemical stability requirements under specific environmental conditions.
[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0066] The embodiments of this application will be further described below with reference to the accompanying drawings.
[0067] Please see Figure 1 One embodiment of this application provides a battery module 100, which includes a battery cell assembly 10 and a cooling plate 20.
[0068] The battery pack 10 includes a plurality of individual battery cells 11. Each individual battery cell 11 includes a housing 111 and a terminal 112. The terminal 112 extends from one side of the housing 111 and is configured to be electrically connected to an external circuit, which may be, but is not limited to, a motherboard of an electrical device equipped with a battery module 100.
[0069] The battery cell 11 includes an electrode assembly and an electrolyte disposed within a housing 111. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes, with metal ions (such as lithium ions) repeatedly inserting and extracting between them. The separator, positioned between the positive and negative electrodes, prevents short circuits between them while allowing active ions to pass through. The terminal post 112, located within the housing 111, is electrically connected to either the positive or negative electrode.
[0070] Please refer to the following: Figure 1 and Figure 2 The cooling plate 20 includes a top wall 21, a bottom wall 22, a side wall 23, a first seal 24, and a second seal 25. The top wall 21 and the bottom wall 22 are spaced apart along a first direction Z. The side wall 23 connects the top wall 21 and the bottom wall 22 to form a receiving cavity 20A, which is filled with coolant. The top wall 21 has a first orifice 21A, and the bottom wall 22 has a second orifice 22A. Each battery cell 11 passes through the corresponding first orifice 21A and second orifice 22A. The portion of the electrode post 112 extending out of the housing 111 is located on the side of the top wall 21 away from the bottom wall 22 or on the side of the bottom wall 22 away from the top wall 21.
[0071] A first sealing element 24 is disposed between the first opening 21A and the housing 111, and the top wall 21 is sealed to the battery cell 11 through the first sealing element 24. A second sealing element 25 is disposed between the second opening 22A and the housing 111, and the bottom wall 22 is sealed to the battery cell 11 through the second sealing element 25. The side wall 23 is provided with an inlet 23A and an outlet 23B communicating with the receiving cavity 20A. The inlet 23A and the outlet 23B are respectively connected to the receiving cavity 20A. The inlet 23A is configured to inject coolant, and the outlet 23B is configured to discharge coolant.
[0072] In the aforementioned battery module 100, the top wall 21 is sealed to the individual cell 11 via a first sealing member 24, and the bottom wall 22 is sealed to the individual cell 11 via a second sealing member 25, thus forming a closed space in the receiving cavity 20A. The portion of the housing 111 located in the receiving cavity 20A is in direct contact with the coolant to improve heat dissipation efficiency. Furthermore, this also reduces the risk of coolant leakage when the battery module 100 is tilted. The portion of the terminal post 112 extending out of the housing 111 is located on the side of the top wall 21 away from the bottom wall 22 or on the side of the bottom wall 22 away from the top wall 21, thus isolating the terminal post 112 from the coolant, reducing the risk of short circuit in the terminal post 112, and thereby improving the safety performance of the battery module 100. The inlet 23A and outlet 23B are used to replace the coolant in the receiving cavity 20A, thereby dissipating heat from the cell assembly 10 through the flowing coolant and improving heat dissipation efficiency.
[0073] Please refer to the following: Figure 1 and Figure 2 In some embodiments, the length of the housing 111 along the first direction Z is H1. The distance between the first orifice 21A and the second orifice 22A is H2, 50%≤H2 / H1≤100%, in order to increase the heat exchange area between the housing 111 and the coolant, and to facilitate the coolant to dissipate heat from the easily heated central area of the housing 111, thereby improving heat dissipation efficiency.
[0074] Optionally, H2 / H1 can be any other value within the range of 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, and 50%≤H2 / H1≤100%.
[0075] Please see Figure 1 In some embodiments, the housing 111 has a top surface 1111, and the pole posts 112 extend from the top surface 1111. The top surface 1111 is located on the side of the top wall 21 away from the bottom wall 22 or on the side of the bottom wall 22 away from the top wall 21, so that the part of the pole post 112 extending out of the housing 111 is always isolated from the coolant.
[0076] In some embodiments, each battery cell 11 includes two terminals 112, which extend from the top surface 1111 respectively, and the two terminals 112 have opposite polarities to facilitate connection with an external circuit.
[0077] In some embodiments, the housing 111 is provided with a pressure relief mechanism 1112. The pressure relief mechanism 1112 is a component or part that releases internal pressure or temperature when the internal pressure or temperature of the battery cell 11 reaches a predetermined threshold. The portion of the housing 111 with the pressure relief mechanism 1112 is located on the side of the top wall 21 away from the bottom wall 22 or on the side of the bottom wall 22 away from the top wall 21, so as to isolate the pressure relief mechanism 1112 from the coolant, reduce the risk of corrosion caused by contact between the pressure relief mechanism 1112 and the coolant, and improve the safety performance of the battery module 100.
[0078] Optionally, the pressure relief mechanism 1112 can be in the form of an explosion-proof valve, explosion-proof disc, air valve, pressure relief valve, safety valve, or groove, and can specifically adopt pressure-sensitive or temperature-sensitive elements or structures. That is, when the internal pressure or temperature of the battery cell 11 reaches a predetermined threshold, the pressure relief mechanism 1112 performs an action or the weak structure provided in the pressure relief mechanism 1112 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.
[0079] In some embodiments, the pressure relief mechanism 1112 is disposed on the top surface 1111 and located between the two pole posts 112.
[0080] In some embodiments, the housing 111 has a bottom surface 1113, and the top surface 1111 and the bottom surface 1113 are spaced apart along a first direction Z. The top surface 1111 is disposed on the side of the top wall 21 away from the bottom wall 22, and the bottom surface 1113 is disposed on the side of the bottom wall 22 away from the top wall 21, so as to facilitate the cooling liquid to dissipate heat from the central heat-prone area of the housing 111, which is beneficial to improving the heat dissipation efficiency.
[0081] Please see Figure 3 In some embodiments, the housing 111 includes a body layer 111A and an insulating layer 111B covering the body layer 111A. The body layer 111A is made of a metallic material, and the thickness of the insulating layer 111B is T1, 10μm≤T1≤200μm, in order to improve insulation stability and reduce space waste caused by excessive thickness of the insulating layer 111B.
[0082] Optionally, T1 can be any value within the range of 10μm, 20μm, 30μm, 30μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 130μm, 130μm, 160μm, 170μm, 180μm, 290μm, 200μm, and any other value within the range of 10μm≤T1≤200μm.
[0083] In some embodiments, the insulating layer 111B is doped with a thermally conductive filler to enhance the heat exchange capacity between the housing 111 and the coolant, thereby improving heat dissipation efficiency. Specifically, the insulating layer 111B is a polymer-based paint such as epoxy or polyurethane, wherein it is doped with high thermal conductivity ceramic powder with a particle size of 10 μm to 30 μm. The high thermal conductivity ceramic powder includes at least one of alumina, boron nitride, and silica micropowder, and the doping ratio is controlled between 10% and 80%. Some powder particles are exposed on the outer surface of the insulating layer 111B to facilitate the formation of an effective heat conduction path with the coolant.
[0084] In some embodiments, the outer surface of the insulating layer 111B facing away from the body layer 111A has alternating concave and convex surfaces to increase the contact area between the insulating layer 111B and the coolant and improve heat dissipation efficiency. Correspondingly, the first orifice 21A and the second orifice 22A are adapted to the outer surface of the insulating layer 111B facing away from the body layer 111A to improve sealing performance.
[0085] In some embodiments, the insulating layer 111B includes a first layer 111B1 and a second layer 111B2 disposed sequentially from the inside out. The first layer 111B1 is a water-resistant layer, and the water vapor transmission rate of the first layer 111B1 is less than or equal to 1×10⁻⁶. -10 The first layer has a water absorption rate of g·cm / (cm²·s·Pa) to improve electrical isolation capability. The second layer, 111B2, is a hydrophobic layer with a water absorption rate of less than or equal to 0.2% to reduce the risk of coolant seepage.
[0086] In some embodiments, the first layer 111B1 and the second layer 111B2 are connected by hot pressing, ultraviolet curing or low-pressure co-molding, and the overall structure has flexibility, resistance to liquid erosion and mechanical vibration, so as to improve the stability of the connection between the housing 111 and the cooling plate 20 and facilitate the contact between the housing 111 and the coolant.
[0087] Please refer to the following: Figure 1 and Figure 2 In some embodiments, the projection of the first aperture 21A and the projection of the second aperture 22A coincide along the first direction Z, so as to facilitate the vertical placement of the battery cell 11.
[0088] It is understood that in some embodiments, the projections of the first aperture 21A and the second aperture 22A partially overlap to facilitate the tilting of the battery cell 11.
[0089] Please refer to the following: Figure 1 and Figure 2 In some embodiments, along the first direction Z, the inlet 23A is lower than the outlet 23B. The first direction Z is the direction of gravity, so that the coolant can be fully filled into the receiving cavity 20A, which is beneficial to increase the heat exchange area between the shell 111 and the coolant and improve the heat dissipation efficiency.
[0090] Please refer to the following: Figure 4 and Figure 5 In some embodiments, the sidewall 23 includes a first wall 231 and a second wall 232 spaced apart along a second direction X, and a third wall 233 and a fourth wall 234 spaced apart along a third direction Y. The first direction Z, the second direction X, and the third direction Y are perpendicular to each other.
[0091] The distance between the first wall 231 and the second wall 232 along the second direction X is greater than the distance between the third wall 233 and the fourth wall 234 along the third direction Y, so that the receiving cavity 20A can accommodate the battery cell assembly 10.
[0092] Observing along the first direction Z, the distance between two adjacent battery cells 11 is D1, and the minimum distance between the battery cell 11 and the side wall 23 is D2, where D2 < D1, in order to optimize the distribution of coolant and facilitate the guidance of more coolant to contact the casing 111 of the battery cell 11, thereby improving the overall heat dissipation uniformity.
[0093] Please see Figure 4 In some embodiments, the first wall 231 is provided with a liquid inlet 23A, and the second wall 232 is provided with a liquid outlet 23B, allowing the coolant to flow from the first wall 231 to the second wall 232. Multiple battery cells 11 are spaced apart along a second direction X, with the thickness direction of each cell 11 parallel to a third direction Y, so that the multiple battery cells 11 are arranged sequentially in the flow direction of the coolant. The coolant flows sequentially over the larger surface areas at the same locations of the multiple battery cells 11, thereby improving heat dissipation efficiency.
[0094] In some embodiments, along the third direction Y, the distance between two adjacent battery cells 11 is D3, 1mm≤D3≤10mm, to facilitate coolant flow and reduce space waste caused by excessive spacing between battery cells 11.
[0095] Optionally, D3 can be any value within the range of 1mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.3mm, 2.5mm, 2.4mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, and any other value within the range of 1mm≤D3≤10mm.
[0096] Furthermore, 2mm≤D3≤3mm is used to further facilitate the flow of coolant and further reduce the space waste caused by excessive spacing between two adjacent battery cells 11.
[0097] Please see Figure 5In some embodiments, the third wall 233 is provided with a liquid inlet 23A, and the fourth wall 234 is provided with a liquid outlet 23B, allowing the coolant to flow from the third wall 233 to the fourth wall 234. Multiple battery cells 11 are spaced apart along the second direction X, with the thickness direction of each cell 11 parallel to the second direction X, so that the multiple battery cells 11 are arranged sequentially in a direction perpendicular to the coolant flow. The coolant simultaneously flows over the larger surface area at the same location on the multiple battery cells 11, thereby improving heat dissipation efficiency.
[0098] In some embodiments, along the second direction X, the spacing between two adjacent battery cells 11 is D4, 1mm≤D4≤10mm, to facilitate coolant flow and reduce space waste caused by excessive spacing between battery cells 11.
[0099] Optionally, D4 can be any value within the range of 1mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.3mm, 2.5mm, 2.4mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, and any other value within the range of 1mm≤D4≤10mm.
[0100] Furthermore, 2mm≤D4≤3mm is used to further facilitate the flow of coolant and further reduce the space waste caused by excessive spacing between two adjacent battery cells 11.
[0101] Please refer to the following: Figure 1 and Figure 2 In some embodiments, the top wall 21, bottom wall 22, and side wall 23 are integrally formed to improve the structural strength of the cooling plate 20. Integral forming methods include, but are not limited to, die casting, stamping, injection molding, compression molding, and 3D printing.
[0102] In some embodiments, the first seal 24 is made of an elastic material and is pressed together by the top wall 21 and the housing 111 to improve sealing performance.
[0103] Optionally, the first seal 24 includes at least one of a silicone ring, a foam pad, an organosilicon sealant, a polyurethane sealant, a modified silane sealant, and a fluorosilicone sealant.
[0104] In some embodiments, the second seal 25 is made of an elastic material and is pressed against the bottom wall 22 and the housing 111 to improve sealing performance.
[0105] Optionally, the second seal 25 is at least one of a silicone ring, a foam pad, an organosilicon sealant, a polyurethane sealant, a modified silane sealant, and a fluorosilicone sealant.
[0106] In some embodiments, the coolant includes at least one of deionized water, a water-glycol mixture, and an aqueous solution containing a buffer component.
[0107] In some embodiments, the coolant includes at least one of a buffer stabilizer and a corrosion inhibitor to improve the pH stability and compatibility of the coolant with metallic materials.
[0108] Optionally, the buffer stabilizer includes at least one of boric acid, sodium bicarbonate, and their soluble salts.
[0109] Optionally, the corrosion inhibitor includes at least one of organic amines, phosphonates, or organic carboxylic acids.
[0110] Please see Figure 6 In some embodiments, the battery module 100 includes a circulation component 30, which includes a liquid pump 31 and a radiator 32. The two ends of the liquid pump 31 are connected to an inlet 23A and an outlet 23B, respectively. The radiator 32 is located outside the cooling plate 20. Under the action of the liquid pump 31, the coolant in the receiving cavity 20A is drawn from the first liquid pipe 311 to the radiator 32 and flows into the receiving cavity 20A from the second liquid pipe 312, forming a circulation channel. Under the action of the liquid pump 31, the coolant in the receiving cavity 20A circulates, improving heat dissipation efficiency.
[0111] In some embodiments, the circulation assembly 30 includes a reservoir that communicates with a receiving cavity 20A. The reservoir contains coolant, and along the first direction Z, the outlet 23B is positioned below the coolant level in the reservoir. The reservoir is configured to allow coolant in the reservoir to flow into the receiving cavity 20A via the height difference of the coolant when the liquid pump 31 fails, thereby reducing the risk of heat dissipation failure.
[0112] In some embodiments, the battery module 100 includes a monitoring module, which includes a temperature sensor and a controller. The temperature sensor is used to collect thermal data of the individual battery cells 11 in real time. The controller adjusts the coolant flow rate based on the data collected by the temperature sensor, or triggers an alarm and power-off protection when there is an abnormal temperature rise, which helps to improve the safety performance of the battery module 100.
[0113] Please see Figure 7 This application provides an electrical device 200, which includes the battery module 100 in any of the above embodiments.
[0114] Electrical equipment 200 may include, but is not limited to, mobile or fixed terminals such as tablet computers (PADs), laptops, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices, in-vehicle devices, wearable devices, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical care, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes.
[0115] In the aforementioned battery module 100 and electrical device 200, the top wall 21 is sealed to the individual cell 11 via a first sealing member 24, and the bottom wall 22 is sealed to the individual cell 11 via a second sealing member 25, thus forming a closed space in the receiving cavity 20A. The portion of the housing 111 located in the receiving cavity 20A is in direct contact with the coolant to improve heat dissipation efficiency. Furthermore, this also reduces the risk of coolant leakage when the battery module 100 is tilted. The portion of the terminal post 112 extending out of the housing 111 is located on the side of the top wall 21 away from the bottom wall 22 or on the side of the bottom wall 22 away from the top wall 21, thus isolating the terminal post 112 from the coolant, reducing the risk of short circuit in the terminal post 112, and thereby improving the safety performance of the battery module 100. The inlet 23A and outlet 23B are used to replace the coolant in the receiving cavity 20A, thereby dissipating heat from the cell assembly 10 through the flowing coolant and improving heat dissipation efficiency.
[0116] In addition, those skilled in the art may make other changes within the spirit of this application. Of course, all such changes made in accordance with the spirit of this application should be included within the scope disclosed in this application.
Claims
1. A battery module, characterized in that, The battery module includes: A battery cell assembly includes multiple individual battery cells, each individual battery cell comprising a housing and a terminal, the terminal extending from one side of the housing; A cooling plate includes a top wall, a bottom wall, a side wall, a first seal, and a second seal. The top wall and the bottom wall are spaced apart along a first direction. The side wall is connected between the top wall and the bottom wall to form a receiving cavity containing coolant. The top wall has a first orifice, and the bottom wall has a second orifice. Each battery cell passes through the corresponding first orifice and second orifice. The portion of the electrode post extending out of the housing is located on the side of the top wall away from the bottom wall or on the side of the bottom wall away from the top wall. The first seal is located between the first orifice and the housing. The top wall is sealed to the battery cell through the first seal. The second seal is located between the second orifice and the housing. The bottom wall is sealed to the battery cell through the second seal. The side wall has an inlet and an outlet communicating with the receiving cavity. The inlet is configured to inject the coolant, and the outlet is configured to discharge the coolant.
2. The battery module as described in claim 1, characterized in that, Along the first direction, the length of the housing is H1, and the distance between the first opening and the second opening is H2, where 50% ≤ H2 / H1 ≤ 100%.
3. The battery module as described in claim 1, characterized in that, Along the first direction, the inlet is lower than the outlet, and the first direction is the direction of gravity.
4. The battery module as described in claim 1, characterized in that, The sidewall includes a first wall and a second wall spaced apart along a second direction, and a third wall and a fourth wall spaced apart along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The distance between the first wall and the second wall along the second direction is greater than the distance between the third wall and the fourth wall along the third direction. When viewed along the first direction, the distance between two adjacent battery cells is D1, and the minimum distance between the battery cell and the sidewall is D2, where D2 < D1.
5. The battery module as described in claim 4, characterized in that, The first wall is provided with the liquid inlet, and the second wall is provided with the liquid outlet; Multiple battery cells are spaced apart along the second direction. The thickness direction of each battery cell is parallel to the third direction. Along the third direction, the distance between two adjacent battery cells is D3, where 1mm ≤ D3 ≤ 10mm.
6. The battery module as described in claim 4, characterized in that, The third wall is provided with the liquid inlet, and the fourth wall is provided with the liquid outlet; Multiple battery cells are spaced apart along the second direction, and the thickness direction of each battery cell is parallel to the second direction. Along the second direction, the distance between two adjacent battery cells is D4, where 1mm≤D4≤10mm.
7. The battery module as described in claim 1, characterized in that, The housing includes a body layer and an insulating layer covering the body layer. The thickness of the insulating layer is T1, where 10 μm ≤ T1 ≤ 200 μm. The insulating layer is doped with thermal conductivity enhancing filler, which includes at least one of alumina, boron nitride, or silica micropowder.
8. The battery module as described in claim 7, characterized in that, The insulating layer comprises a first layer and a second layer arranged sequentially from the inside out; The water vapor permeability of the first layer is less than or equal to 1×10⁻⁶. -10 g·cm / (cm²·s·Pa), the water absorption rate of the second layer is less than or equal to 0.2%.
9. The battery module as described in claim 1, characterized in that, The top wall, the bottom wall, and the side wall are integrally formed.
10. An electrical appliance, characterized in that, The electrical equipment includes the battery module as described in any one of claims 1 to 9.