Battery pack and powered device

Abstract

Provided are a battery pack and an electric device. The battery pack comprises a battery pack, a box, a heat exchange element and a partition pad. The battery pack comprises a plurality of batteries. The box accommodates the batteries and comprises a box bottom plate. The heat exchange element is arranged above the box bottom plate, supports the battery pack, cooperates with the box bottom plate to form a discharge space, and is provided with a plurality of discharge holes. The partition pad is laid on the heat exchange element and is located between the battery pack and the heat exchange element. The battery is provided with an explosion-proof valve opposite the corresponding discharge hole, and when the battery is thermally failed, the spew-out from the explosion-proof valve enters the discharge space through the partition hole of the partition pad and the discharge hole in turn, and the hole edge of the partition hole protrudes inward beyond the hole edge of the discharge hole. When the high-temperature spew-out is released, it first impacts the inwardly protruding hole edge of the partition hole, effectively blocks the high-temperature spew-out, reduces the risk of the spew-out directly spewing and igniting the adjacent battery or heat exchange element, makes it change direction more smoothly into the discharge hole, and reduces the direct impact force on the discharge hole on the heat exchange element.

Description

Technical Field

[0001] This disclosure relates to the field of batteries, and in particular, to a battery pack and an electrical device having the battery pack. Background Technology

[0002] A battery pack, comprising battery cells and heat exchangers, is known. During normal battery cell cycling, heat is generated and dissipated through heat exchangers. When a cell in the battery pack experiences thermal runaway, its explosion-proof valve ejects high-temperature ejected material, which is discharged through pre-designed vent holes on the heat exchangers. However, due to the limited high-temperature resistance of the heat exchangers, the high-temperature ejected material is highly susceptible to ablation or melting through the vent holes as it flows through them, leading to localized melting or structural failure of the heat exchangers and ultimately causing internal coolant leakage. Utility Model Content

[0003] In view of this, the present disclosure provides a battery pack to solve the problem that high-temperature ejected material is easily ablated or melted through the discharge hole when flowing through the discharge hole, resulting in local melting of the heat exchange component or structural failure.

[0004] The battery pack includes a battery assembly, a housing, a heat exchanger, and a separator. The battery assembly may include multiple batteries. The housing houses the batteries and includes a base plate. The heat exchanger is located above the base plate, supporting the battery assembly and forming a discharge space with the base plate, and has multiple discharge holes. The separator is laid on the heat exchanger and located between the battery assembly and the heat exchanger. Each battery has an explosion-proof valve corresponding to a discharge hole. In the event of battery thermal failure, the ejected material enters the discharge space through the explosion-proof valve, the separator holes, and the discharge holes, with the edges of the separator holes protruding inward beyond the edges of the discharge holes.

[0005] Based on the above structure, in the event of thermal runaway in any battery within the battery pack, high-temperature gas and ejected materials are released from the explosion-proof valve at the bottom of the battery. They first pass through the septum holes on the separator, then through the discharge holes on the heat exchanger, entering the discharge space, and finally exiting the casing through the bottom plate. The inner edge of the discharge hole is the most vulnerable and susceptible area to high-temperature impact on the heat exchanger. When high-temperature ejected materials are released, they first impact the inwardly protruding edge of the septum holes, effectively blocking, slowing down, and cooling the ejected materials. This reduces the risk of the ejected materials directly spraying out and igniting adjacent batteries or heat exchangers. Simultaneously, it diverts and guides the high-speed airflow, allowing it to smoothly change direction and enter the discharge hole, reducing the direct impact force on the discharge hole on the heat exchanger. The separator can be made of high-temperature resistant and corrosion-resistant materials to withstand the high-temperature impact of the ejected materials and prevent ablation or structural deformation of the heat exchanger. The edge of the separator hole protrudes inward beyond the edge of the discharge hole. When the battery experiences thermal runaway, it can effectively block the direct impact of the ejected material on the discharge hole of the heat exchange component, avoid melting through or damaging the structure of the heat exchange component, thereby preventing coolant leakage, reducing the risk of insulation failure and potential secondary thermal runaway caused by leakage, and further improving the safety and operational reliability of the battery pack.

[0006] This disclosure also provides an electrical appliance. The electrical appliance includes the aforementioned battery pack. Attached Figure Description

[0007] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0008] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0009] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0010] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present disclosure.

[0011] Figure 2 For along Figure 1 A schematic cross-sectional view of the battery pack.

[0012] Figure 3 for Figure 2 A magnified view of part A in the middle.

[0013] Figure 4 This is a partial cross-sectional view of a battery pack according to another embodiment of the present disclosure.

[0014] Figure 5 This is a partial cross-sectional view of a battery pack according to another embodiment of the present disclosure.

[0015] Figure 6This is a schematic diagram of the structure of a septum according to another embodiment of the present disclosure.

[0016] Figure 7 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present disclosure.

[0017] Explanation of reference numerals in the attached figures: 100—Battery pack; 10—Battery; 11—Explosion-proof valve; 20—Box body; 21—Box body bottom plate; 22—Exhaust space; 30—Heat exchanger; 31—Drain hole; 32—Flow channel; 40—September; 41—September hole; 42—Main body; 43—Thickened part; 44—Sealing part; 45—Weak part; 50—Battery management system; 60—Box body top cover; 70—Separation beam; 200—Electrical equipment. Detailed Implementation

[0018] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0019] <Example battery pack 100> This disclosure provides a battery pack 100 according to one embodiment. (See reference...) Figure 1 and Figure 2 The battery pack 100 includes multiple batteries 10, a housing 20, a heat exchange component 30, and a spacer 40. The multiple batteries 10 are electrically connected to form a battery pack. The housing 20 houses the batteries 10 and the battery management system 50. The batteries 10 are electrically connected to the battery management system 50 to enable the charging and discharging process of the multiple batteries 10. The batteries 10 and the battery management system 50 are separated by a partition beam 70. The housing 20 and the housing top cover 60 serve as external protective structures, typically made of metal or composite materials, and are waterproof, dustproof, and impact-resistant, providing a safe operating environment for the internal components such as the batteries 10 and the battery management system 50.

[0020] The battery pack 100 may also include a battery group composed of multiple batteries 10 connected in series and parallel, and integrate a battery management system 50 (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components. These components are housed within the receiving cavity of the housing 20 and sealed by the housing top cover 60, forming a complete functional unit capable of directly outputting electrical energy. The battery pack 100 can serve as a power source for new energy vehicles, primarily used for storing and providing electrical energy, as the rechargeable battery 10 is the primary power source for these vehicles.

[0021] The battery pack 100 includes a battery assembly, a housing 20, a heat exchanger 30, and a spacer 40. The battery assembly includes multiple batteries 10. The housing 20 houses the batteries 10 and includes a base plate 21. The heat exchanger 30 is located above the base plate 21, supports the battery assembly, and cooperates with the base plate 21 to form a discharge space 22, and has multiple discharge holes 31. The spacer 40 is laid on the heat exchanger 30 and is located between the multiple batteries 10 and the heat exchanger 30. Each battery 10 has an explosion-proof valve 11 that is directly opposite the corresponding discharge hole 31. When the battery 10 fails thermally, the ejected material enters the discharge space 22 from the explosion-proof valve 11, through the spacer hole 41 of the spacer 40, and through the discharge hole 31. The edge of the spacer hole 41 protrudes inward beyond the edge of the discharge hole 31.

[0022] The heat exchanger 30 can serve as a component for regulating battery temperature. The heat exchanger 30 has an internal heat exchange channel for the flow of a heat exchange medium. This medium can be a gas (air), a liquid (such as water, alcohol, refrigerant, oil, etc.), or a solid (such as thermally conductive adhesive, thermally conductive solder paste, etc.). The heat exchange channel has an inlet and an outlet for the heat exchange medium. The medium enters the channel through the inlet, exchanges heat with the battery cells, and then exits through the outlet, thus achieving heat exchange with the battery cells. The heat exchanger 30 can exchange heat with the battery cells. It can be made of a material with high thermal conductivity, such as copper. Alternatively, it can have a heat pipe inside, which can rapidly transfer heat through convection. Or, it can have a channel connecting to a heating or cooling device, through which a liquid medium flows, enabling efficient heat exchange. The heat exchanger 30 includes a heating element and an electrical connector. The heating element can be a heating wire, a heating film, or a heating plate; this disclosure does not impose any limitations. The heat exchanger 30 can be made of metal, such as aluminum alloy or magnesium alloy, or it can be made of plastic. The separator 40 can be placed between adjacent battery cells 10 to prevent heat conduction between the battery cells 10, preventing thermal runaway from some battery cells 10 from being transferred to adjacent battery cells, thereby suppressing heat propagation within the battery device. The separator 40 can be made of composite materials, such as epoxy resin, or any suitable high-insulation material. The separator 40 can be a composite heat insulation pad. The composite heat insulation pad can consist of a first encapsulation layer, a heat insulation pad body, and a second encapsulation layer. The first encapsulation layer is a plastic film or polymer encapsulation film with a thickness of 0.1 mm to 0.3 mm. The heat insulation pad body is a ceramic heat insulation pad with a thickness of 1.0 mm to 8.0 mm. The second encapsulation layer is at least one of an insulating film and a heat-insulating film. The function of the second encapsulation layer is to be located on the outer surface of the heat insulation pad body and encapsulate the heat insulation pad body and the flame-retardant composite layer. The thermal insulation pad body is made of aerogel and a porous fiber substrate. The aerogel can be an inorganic porous aerogel material such as silica, and the porous fiber substrate includes at least one of pre-oxidized fiber felt, glass fiber felt, and ceramic fiber felt. Inorganic porous aerogel materials such as silica have extremely low thermal conductivity and good heat resistance. The composite thermal insulation pad can consist of an encapsulation layer and a phase change material layer. The encapsulation layer is an aluminum-plastic film or a polymer encapsulation film. The phase change material can be a solid phase change material, a liquid phase change material, a solid-liquid mixed phase change material, or a semi-solid phase change material. Optionally, the phase change material includes, but is not limited to, water of crystallization and salts, phase change molten salts, paraffin wax, silicone oil, silica-alumina sol, fatty acids, alcohols, and other substances capable of undergoing phase change and endothermic reactions.

[0023] According to the above structure, in the event of thermal runaway of any battery 10 in the battery pack, the high-temperature gas and ejected material are released from the explosion-proof valve 11 at the bottom of the battery 10. They first pass through the septum hole 41 on the septum 40, then through the discharge hole 31 on the heat exchanger 30 into the discharge space 22, and are discharged outside the housing 20 via the bottom plate 21. The inner edge of the discharge hole 31 is the most vulnerable and susceptible area to high-temperature impact on the heat exchanger 30. When the high-temperature ejected material is released, it first impacts the inwardly protruding edge of the septum hole 41, effectively blocking, slowing down, and cooling the high-temperature ejected material, reducing the risk of the ejected material directly spraying and igniting adjacent batteries 10 or the heat exchanger 30. Simultaneously, it diverts and guides the high-speed ejected airflow, allowing it to smoothly change direction and enter the discharge hole 31, reducing the direct impact force on the discharge hole 31 on the heat exchanger 30. The septum 40 can be made of high-temperature resistant and corrosion-resistant materials to resist the high-temperature impact of the ejected material and prevent the heat exchanger 30 from burning or deforming. The edge of the septum hole 41 protrudes inward beyond the edge of the discharge hole 31. When the battery 10 experiences thermal runaway, it can effectively block the direct impact of the ejected material on the discharge hole 31 on the heat exchange component 30, avoid melting through or damaging the structure of the heat exchange component 30, thereby preventing coolant leakage, reducing the risk of insulation failure and potential secondary thermal runaway caused by leakage, and further improving the safety and operational reliability of the battery pack 100.

[0024] refer to Figure 2 and Figure 3 The heat exchanger 30 has a flow channel 32. The orthographic projection of the battery 10 on the heat exchanger 30 partially overlaps with the flow channel 32. The width of the portion of the septum hole 41 that protrudes inward beyond the edge of the discharge hole 31 is W1 (in mm). The distance from the edge of the discharge hole 31 to the flow channel 32 is D1 (in mm), and 0.01 ≤ W1 / D1 ≤ 1.5. Preferably, 0.1 ≤ W1 / D1 ≤ 1. More preferably, 0.2 ≤ W1 / D1 ≤ 0.8. Alternatively, the ratio W1 / D1 can also be 0.3, 0.4, 0.5, 0.6, or 0.7. When W1 / D1 is too small, i.e., W1 / D1 is less than 0.01, it indicates that the septum hole 41 does not adequately shield the ejected material, and the high-temperature impact material can easily act directly on the edge of the discharge hole 31 or the wall of the flow channel 32, increasing the risk of structural ablation or breakdown. When W1 / D1 is too large, i.e., W1 / D1 is greater than 1.5, it indicates that the septum orifice 41 excessively obstructs the ejected material, which may lead to increased discharge resistance and decreased space utilization. Based on the above ratio range, the thermal risk of ejected material impacting the discharge orifice 31 can be effectively isolated.

[0025] Further, 0.1mm≤W1≤3mm, 1mm≤D1≤10mm. Preferably, 0.5mm≤W1≤2.5mm. More preferably, 1mm≤W1≤2mm. Alternatively, the value of W1 can also be 1.2mm, 1.4mm, 1.6mm, or 1.8mm, etc. When W1 is too small, i.e., W1 is less than 0.1mm, it indicates that the shielding width of the separator hole 41 to the discharge hole 31 is insufficient. The high-temperature ejected material from the thermal runaway of the battery 10 can easily bypass the edge of the separator hole 41 and directly impact the discharge hole 31 or the flow channel 32 of the heat exchanger 30, which may cause the flow channel 32 to be burned, melted through, or eroded and broken. When W1 is too large, i.e., W1 is greater than 3mm, it indicates that the septum hole 41 obstructs the discharge hole 31 too much, excessively encroaching on the discharge channel space of the high-temperature ejected material, restricting the flow path, increasing the flow resistance during the pressure relief process, which may lead to the internal pressure of the battery 10 not being released in time, and even poses a risk of reverse impact on the battery 10 itself, affecting the pressure relief effect. At the same time, a larger W1 will also increase the volume and weight of the battery pack 100. According to the above proportional range, it can be ensured that the protruding width of the thickened part 43 is sufficient to effectively isolate the thermal risk of the ejected material impacting the discharge hole 31. Preferably, 2mm≤D1≤9mm. More preferably, 3mm≤D1≤8mm. Alternatively, the value of D1 can also be 4mm, 5mm, 6mm, or 7mm, etc. When D1 is too small, i.e., D1 is less than 1 mm, it indicates that the distance from the edge of the discharge hole 31 to the flow channel 32 is insufficient. When the battery 10 experiences thermal runaway, the high-temperature ejected material can easily impact the wall of the flow channel 32 directly through the discharge hole 31, potentially causing the flow channel 32 to ablate. When D1 is too large, i.e., D1 is greater than 10 mm, it indicates that the distance from the edge of the discharge hole 31 to the flow channel 32 is too large, resulting in redundant layout of the heat exchanger 30. Based on the above proportional range, the internal space utilization of the heat exchanger 30 is maximized.

[0026] refer to Figure 2 and Figure 4 The septum 40 may include a body portion 42 and a thickened portion 43. The thickened portion 43 has a closed structure surrounding the septum hole 41. The thickness of the body portion 42 is T1 (mm), and the thickness of the thickened portion 43 is T2 (mm), where T2 > T1. The body portion 42 may cover the entire top surface of the heat exchanger 30, providing basic isolation. The top surface of the heat exchanger 30 may be a reference surface. Figure 2 The surface on the X+ side in the X direction. The thickened portion 43 surrounds each separator hole 41 in a closed ring structure, providing good impact resistance. In the event of thermal runaway of the battery 10, the high-temperature ejected material stream first impacts the inner edge of the separator hole 41. The thickened portion 43 can effectively withstand and resist the high-speed impact and high-temperature ablation of the ejected material from multiple angles. At the same time, the thickness of the thickened portion 43 is greater than the thickness of the main body portion 42, providing excellent local thermal insulation protection.

[0027] Furthermore, the ratio T2 / T1 can satisfy: 0.2≤T2 / T1≤2. Preferably, 0.5≤T2 / T1≤1.5. More preferably, 0.8≤T2 / T1≤1.2. Alternatively, the value of the ratio T2 / T1 can also be 0.9, 0.95, 1, or 1.1, etc. When T2 / T1 is too small, i.e., T2 / T1 is less than 0.2, it indicates that the thickness of the thickened portion 43 is insufficient compared to the protruding thickness of the main body portion 42, the local reinforcement effect is limited, it is difficult to effectively resist the impact and ablation of ejected materials, and it is easy to cause damage or penetration around the septum hole. When T2 / T1 is too large, i.e., T2 / T1 is greater than 2, it indicates that the thickness of the thickened portion 43 is too large compared to the protruding thickness of the main body portion 42. Although it can enhance protection, it will lead to material waste, increase the overall weight of the septum 40, and encroach on the space of the battery 10. Based on the above ratio range, it can not only resist the impact and ablation of high-temperature jets, but also avoid stress concentration or decreased process consistency caused by excessive local thickening.

[0028] Further, 0.5mm≤T1≤5mm, 1mm≤T2≤5mm. Preferably, 1mm≤T1≤4mm. More preferably, 1.5mm≤T1≤3.5mm. Alternatively, T1 can also be 2mm, 2.5mm, 2.9mm, or 3.3mm. When T1 is too small, i.e., T1 is less than 0.5mm, the insufficient thickness of the body part 42 will result in insufficient overall mechanical strength of the separator 40, making it difficult to effectively support the battery pack and prone to deformation or damage due to vibration or compression. When T1 is too large, i.e., T1 is greater than 5mm, the excessive thickness of the body part 42 will cause the separator 40 to encroach on the space layout of the battery pack, and at the same time affect the heat transfer between the heat exchanger 30 and the battery 10. According to the above proportional range, the body part 42 can provide necessary isolation and support while avoiding material waste and space occupation. Preferably, 1.5mm≤T2≤4.5mm. More preferably, 2mm≤T2≤4mm. Alternatively, T2 can be 2.5mm, 3mm, 3.2mm, or 3.4mm. When T2 is too small, i.e., less than 1mm, the thickened portion 43 is not sufficiently reinforced locally, making it difficult to effectively resist the high-speed impact and high-temperature ablation of ejected material during battery thermal runaway. When T2 is too large, i.e., greater than 5mm, it will result in material waste in the thickened portion 43 and may also encroach on the space layout of the battery 10. Based on the above proportional range, the thickened portion 43 ensures that the circumferential area of ​​the separator hole has sufficient mechanical strength and thermal capacity to effectively resist the high-speed impact and high-temperature ablation of the thermal runaway jet.

[0029] Continue to refer to Figure 4The heat exchanger 30 has a flow channel 32. The orthographic projection of the battery 10 on the heat exchanger 30 partially overlaps with the flow channel 32. The width of the thickened portion 43 is W2 (mm), and the distance from the edge of the discharge hole 31 to the flow channel 32 is D1 (mm). 0.1≤W2 / D1≤1. Preferably, 0.2≤W2 / D1≤0.9. More preferably, 0.3≤W2 / D1≤0.8. Alternatively, the ratio W2 / D1 can also be 0.4, 0.5, 0.6, or 0.7. When W2 / D1 is too small, i.e., W2 / D1 is less than 0.1, the width of the thickened portion 43 is insufficient to adequately shield the area between the discharge hole 31 and the flow channel 32 from the ejected material, and may even directly ablate the surface of the heat exchanger 30 or damage the structure of the flow channel 32. When W2 / D1 is too large, i.e., W2 / D1 is greater than 1, the distance from the edge of the thickened portion 43 to the flow channel 32 is too large. This not only encroaches on the space layout of the battery pack but also increases the material cost and weight of the battery pack 100. Based on the above ratio range, the width of the thickened portion 43 and the distance to the flow channel 32 can be reasonably matched, effectively isolating the risk of ejected material impact while avoiding the waste of space and cost caused by excessive extension.

[0030] Further, 1mm≤W2≤8mm, 1mm≤D1≤10mm. Preferably, 2mm≤W2≤7mm. More preferably, 3mm≤W2≤6mm. Alternatively, W2 can also be 4mm, 4.5mm, 5mm, or 5.5mm. If W2 is too small, i.e., W2 is less than 1mm, the protective area formed by the thickened portion 43 is insufficient, and high-temperature ejected material can easily bypass the area of ​​the thickened portion 43 and impact positions outside the periphery of the spacer hole 41. If W2 is too large, i.e., W2 is greater than 8mm, the thickened portion 43 extends excessively, affecting the spatial layout of the battery pack. According to the above proportional range, the thickened portion 43 is ensured to have sufficient width to isolate the impact of ejected material and heat load, effectively protecting the discharge hole 31 and the flow channel 32 area, while avoiding unnecessary material redundancy and space waste. According to the proportional range of 1mm≤D1≤10mm, the internal space utilization of the battery pack 100 is maximized.

[0031] refer to Figure 5 and Figure 6The separator 40 may also include a sealing portion 44, which is connected to the thickened portion 43 via a weak portion 45. Under the impact of ejected material, the sealing portion 44 separates from the thickened portion 43 through the fracture of the weak portion 45, forming a separator hole 41. Under normal battery cycle conditions, the sealing portion 44 tightly blocks the hole. When the battery 10 experiences thermal runaway, the high-pressure ejected material concentrates its impact on the sealing portion 44. When the impact force exceeds the mechanical strength of the weak portion 45, the weak portion 45 fractures, and the sealing portion 44 separates from the separator 40 and is impacted, forming the separator hole 41, which is the discharge channel for the high-temperature ejected material. During normal operation of the battery pack, external moisture, dust, or corrosive gases are prevented from entering the interior of the battery 10 or the flow channel 32 area of ​​the heat exchanger 30 through the separator hole 41, improving the environmental adaptability and long-term durability of the battery pack 100.

[0032] Back Figure 5 The thickness of the sealing portion 44 is T3, where T2 > T3. That is, the thickness of the sealing portion 44 is less than the thickness of the thickened portion 43, ensuring that when the battery experiences thermal runaway due to impact from ejected material, stress will preferentially concentrate on the thinnest sealing portion 44 and its weakest point 45 connected to the thickened portion 43. Based on this structure, only a relatively small impact force and internal pressure are needed to cause the sealing portion 44 to quickly break along the weakest point 45 and separate from the separator 40, thereby promptly forming an effective discharge channel and achieving rapid release of thermal runaway pressure. The weakest point 45 can be formed by reducing the material thickness along a predetermined annular path through methods such as stamping or laser ablation, creating an annular thin region whose thickness is much smaller than the thickness of the sealing portion and the thickened portion. In another embodiment, the weakest point 45 can be short, spaced-apart broken segments, uniformly distributed circumferentially around the sealing portion 44. In another embodiment, the weak portion 45 may be formed by connecting the sealing portion 44 and the thickening portion 43 together in an annular bonding area using an adhesive, hot melt welding or other welding methods.

[0033] T1 > T3. That is to say, the thickness of the sealing part 44 is less than the thickness of the body part 42, which further ensures that when subjected to the impact of the ejected material, the stress will be preferentially concentrated in the weak part 45, effectively preventing the impact force from being transmitted to the surrounding thickened part 43 or the body part 42, causing cracks or damage to the septum 40, and protecting the integrity and repeatability of the body part 42 of the septum 40.

[0034] Furthermore, the ratio T1 / T3 can satisfy: 1≤T1 / T3≤50. Preferably, 5≤T1 / T3≤45. More preferably, 15≤T1 / T3≤35. Alternatively, the value of the ratio T1 / T3 can also be 20, 24, 28, or 32, etc. When T1 / T3 is too small, i.e., T1 / T3 is less than 1, it indicates that the thickness of the sealing part 44 is relatively too large, which requires a greater impact force to break the sealing part 44, which may lead to the pressure relief channel not opening in time, and may also cause unexpected and unpredictable tearing in areas of the septum 40 that should not be damaged. When T1 / T3 is too large, i.e., T1 / T3 is greater than 50, it indicates that the thickness of the sealing part 44 is insufficient, resulting in poor mechanical rigidity. During the daily vibration, compression, or thermal expansion and contraction of the battery pack 100, fatigue damage or even accidental rupture may occur, leading to seal failure. According to the above ratio range, the long-term sealing reliability of the sealing part 44 is guaranteed.

[0035] Further, 0.1mm ≤ T3 ≤ 1mm. Preferably, 0.15mm ≤ T3 ≤ 0.9mm. More preferably, 0.2mm ≤ T3 ≤ 0.8mm. Alternatively, T3 can also be 0.3mm, 0.4mm, 0.5mm, 0.6mm, or 0.7mm. When T3 is too small, i.e., T3 is less than 0.1mm, the thickness of the sealing part 44 is extremely thin, which may cause fatigue damage or even accidental rupture, leading to seal failure. When T3 is too large, i.e., T3 is greater than 1mm, this indicates that extremely high impact pressure is required to break the sealing part 44, which may prevent the pressure relief channel from opening in time. According to the above proportional range, under the normal cycling state of the battery 10, the sealing part 44 is sufficient to resist various stresses under normal operating conditions, ensuring long-term stability of the seal. In the event of thermal runaway of any battery 10, the sealing part 44 is effectively opened, forming a pressure relief channel.

[0036] Back Figure 2 The separator 40 is made of epoxy resin, silicone, mica, or fiber aerogel. These materials all have extremely high melting points or thermal decomposition temperatures, enabling them to withstand the impact of high-temperature ejected materials during thermal runaway of the battery 10, preventing melting or structural failure. Simultaneously, these materials possess extremely low thermal conductivity, effectively blocking heat transfer to the heat exchanger 30 and preventing the exhaust holes 31 on the heat exchanger 30 from melting due to overheating, thereby significantly reducing the risk of coolant leakage and subsequent thermal runaway propagation.

[0037] <Example Electrical Equipment> This utility model embodiment also provides an electrical device 200, which may include the battery pack 100 described above.

[0038] By way of example only, electrical equipment 200 can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, construction vehicles, etc.

[0039] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0040] In a non-restrictive example, refer to Figure 7 The electrical equipment 200 can be an electric vehicle 200, and the battery pack 100 can be used as a power source to provide power to the electric vehicle 200.

[0041] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0042] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0043] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0044] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, include: A battery pack, comprising multiple batteries; The enclosure houses the batteries and includes a base plate. A heat exchanger, located above the bottom plate of the housing, supports the battery pack and cooperates with the bottom plate to form a discharge space, and is provided with multiple discharge holes; and A spacer is laid on the heat exchanger and located between the battery pack and the heat exchanger. The battery is equipped with an explosion-proof valve that is directly opposite the corresponding discharge port. When the battery fails thermally, the ejected material enters the discharge space from the explosion-proof valve, through the septum hole of the septum and the discharge port in sequence. The edge of the septum hole protrudes inward beyond the edge of the discharge port.

2. The battery pack according to claim 1, characterized in that, The heat exchanger is provided with a flow channel. The orthographic projection of the battery on the heat exchanger partially overlaps with the flow channel. The width of the portion of the septum hole protruding inward beyond the edge of the discharge hole is W1, in mm. The distance from the edge of the discharge hole to the flow channel is D1, in mm. 0.01≤W1 / D1≤1.

5.

3. The battery pack according to claim 2, characterized in that, 0.1mm≤W1≤3mm, 1mm≤D1≤10mm.

4. The battery pack according to claim 1, characterized in that, The septum includes a body portion and a thickened portion. The thickened portion has a closed structure surrounding the septum hole. The thickness of the body portion is T1 in mm, and the thickness of the thickened portion is T2 in mm, where T2 > T1.

5. The battery pack according to claim 4, characterized in that, 0.2≤T2 / T1≤2.

6. The battery pack according to claim 5, characterized in that, 0.5mm≤T1≤5mm, 1mm≤T2≤5mm.

7. The battery pack according to claim 4, characterized in that, The heat exchanger is provided with a flow channel. The orthographic projection of the battery on the heat exchanger partially overlaps with the flow channel. The width of the thickened part is W2 in mm. The distance from the edge of the discharge hole to the flow channel is D1 in mm. 0.1≤W2 / D1≤1.

8. The battery pack according to claim 7, characterized in that, 1mm≤W2≤8mm, 1mm≤D1≤10mm.

9. The battery pack according to claim 4, characterized in that, The septum also includes a sealing part, which is connected to the thickened part through a weak part. Under the impact of the ejected material, the sealing part separates from the thickened part by the fracture of the weak part, thus forming the septum hole.

10. The battery pack according to claim 9, characterized in that, The thickness of the sealing part is T3, where T2 > T3.

11. The battery pack according to claim 10, characterized in that, T1 > T3.

12. The battery pack according to claim 11, characterized in that, 1≤T1 / T3≤50.

13. The battery pack according to claim 12, characterized in that, 0.1mm≤T3≤1mm.

14. The battery pack according to claim 1, characterized in that, The spacer is made of epoxy resin, silicone, mica, or fiber aerogel.

15. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1 to 14.

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