Battery device and electric equipment

Abstract

The utility model relates to a battery device and electric equipment, the battery device comprises a shell, a shielding layer and a plurality of battery monomers, the plurality of battery monomers are arranged in the shell, each battery monomer is provided with a pressure relief part, the shell comprises a structural part, an avoidance opening is formed in the structural part, the pressure relief parts face the avoidance opening, and the shielding layer is arranged on the shielding layer. The avoiding opening is used for forming a pressure relief channel of at least one pressure relief piece; the shielding layer is arranged around the circumferential direction of the avoiding opening and is in conductive connection with at least part of the wall surface of the avoiding opening, the shielding layer is used for being capable of blocking between the conductive substance discharged by the pressure relief piece and the structural piece when the single battery is in thermal runaway, and the resistivity of the shielding layer is larger than that of the structural piece and smaller than that of the insulating material. According to the technical scheme, the battery device provided by the utility model can reduce the possibility of faults such as short circuit ignition caused by insulation failure of multiple points.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electrical equipment, and in particular, to a battery device and an electrical equipment. Background Art

[0002] In related technologies, when a battery pack experiences thermal runaway, the internal temperature of the battery cell rises. As the internal air pressure rises, the explosion-proof valve on the battery cell opens, and the high-temperature particles and conductive polymers inside the battery cell are sprayed out through the explosion-proof valve to achieve the purpose of pressure relief. However, during the pressure relief process of the explosion-proof valve, the conductive polymer is prone to direct contact with metal parts, causing the risk of insulation failure in the battery pack. Even when insulation failure occurs at multiple points, it may cause short circuits and ignition. Utility Model Content

[0003] The purpose of the present disclosure is to provide a battery device and an electrical device that can reduce the possibility of insulation failure at multiple points causing short circuits and ignition, so as to at least partially solve the above technical problems.

[0004] In order to achieve the above-mentioned purpose, the first aspect of the present disclosure provides a battery device, comprising: a plurality of battery cells, each of which is provided with a pressure relief member; a shell, the plurality of battery cells are arranged in the shell, the shell includes a structural member, a avoidance port is formed on the structural member, the pressure relief member faces the avoidance port, and the avoidance port is used to form a pressure relief channel for at least one of the pressure relief members; and a shielding layer, the shielding layer is arranged around the circumference of the avoidance port and is conductively connected to at least part of the wall surface of the avoidance port, the shielding layer is used to block the conductive material discharged by the pressure relief member and the structural member when the battery cell thermally runs away, and the resistivity of the shielding layer is greater than the resistivity of the structural member and less than the resistivity of the insulating material.

[0005] Optionally, the resistivity of the shielding layer is ρ, where 10 5 Ω·m ≤ ρ<10 10 Ω·m.

[0006] Optionally, the shielding layer is at least one of an epoxy resin carbon nanotube layer, an epoxy resin graphite layer and an epoxy resin nickel powder layer.

[0007] Optionally, the thickness of the shielding layer is D, the capacity of the battery cell is Q, and 0.02 Ah / μm<Q / D<1.5 Ah / μm.

[0008] Optionally, the thickness of the shielding layer is D, the system voltage of the battery device is U, and 0.2m / V<U / D<2.5m / V.

[0009] Optionally, the thickness of the shielding layer is D, the resistance of the shielding layer is R, 10 8 Ω / m<R / D<10 14 Ω / m.

[0010] Optionally, in a first direction perpendicular to a center line of the avoidance opening, a distance between an edge of the avoidance opening and an outer edge of the pressure relief member is d1, and the shielding layer includes a first structural layer, which is arranged on a first surface of the structural member facing the battery cell, and in the first direction, a width of the first structural layer is d2, wherein 1<d2 / d1<3.

[0011] Optionally, the shielding layer includes a first structural layer, which is arranged on the first surface of the structural member facing the battery cell. In a first direction perpendicular to the center line of the avoidance opening, the width of the first structural layer is d2, and in a second direction along the center line of the avoidance opening, the distance between the bottom of the pressure relief member facing the avoidance opening and the first surface of the structural member is d3, wherein 3<d2 / d3<6.25.

[0012] Optionally, the plurality of battery cells are bonded to the structural member via an adhesive layer, and along the second direction, a thickness of the adhesive layer is equal to a distance between a bottom portion of the pressure relief member facing the escape opening and the first surface of the structural member.

[0013] Optionally, the shielding layer is a coating provided on the structural member, or the shielding layer is bonded to the structural member, or the shielding layer is welded to the structural member.

[0014] Optionally, the outer wall surface of the shielding layer facing the battery cell includes a plane, which is opposite to and parallel to the bottom surface of the battery cell; or, the outer wall surface of the shielding layer facing the battery cell includes an inclined surface, which extends obliquely toward the inner side of the avoidance port and in a direction away from the pressure relief member; or, the outer wall surface of the shielding layer facing the battery cell includes a step surface, which is arranged in a step-like manner toward the inner side of the avoidance port and gradually away from the pressure relief member.

[0015] Optionally, the shielding layer includes a first structural layer, a second structural layer and a third structural layer, the first structural layer is arranged on the first surface of the structural member facing the battery cell, the second structural layer is arranged on the second surface of the structural member away from the battery cell, and the third structural layer is connected between the first structural layer and the second structural layer and is arranged in contact with the inner wall surface of the avoidance opening; the upper surface of the first structural layer facing the battery cell includes the plane; or, the upper surface of the first structural layer facing the battery cell includes the inclined surface; or, the upper surface of the first structural layer facing the battery cell includes the step surface; or, the upper surface of the first structural layer facing the battery cell and the inner side surface of the third structural layer facing the center of the pressure relief channel form the step surface.

[0016] Optionally, the shell includes a base plate assembly supporting the multiple battery cells, the base plate assembly includes a first plate and a second plate arranged relative to each other, an exhaust channel is formed between the first plate and the second plate, the first plate is the structural member, and the avoidance port is used to connect the pressure relief member and the exhaust channel; wherein, the first plate includes a cooling plate for cooling the multiple battery cells; or, the first plate includes a plate body, and the plate body is used to support the multiple battery cells.

[0017] A second aspect of the present disclosure provides an electrical device, comprising the battery device provided by the first aspect.

[0018] Through the above technical solution, when thermal runaway occurs in a battery cell, the shielding layer blocks the conductive material discharged by the pressure relief component and the structural component, thereby preventing the conductive material discharged by the pressure relief component from directly contacting the structural component, thereby reducing the possibility of insulation failure in the battery device. In addition, due to the presence of the shielding layer, and the resistivity of the shielding layer is greater than the resistivity of the structural member and less than the resistivity of the insulating material, the shielding layer can serve a purpose similar to that of a resistor. In this way, when thermal runaway occurs at multiple points (i.e., when multiple pressure relief parts are opened to relieve pressure), even if a path is formed at the battery cell, the shielding layer, and the structural member, so that, for example, the two battery cells where the two pressure relief parts are located and the battery cells connected in series between the two battery cells (if any) are short-circuited through the structural member and the shielding layer, the shielding layer can increase the resistance value of the path formed at the battery cell, the shielding layer, and the structural member, so that an ampere-level discharge current can be generated on the path formed at the battery cell, the shielding layer, and the structural member. This current can reduce the state of charge inside the battery cell, reduce the current in the path, and thereby reduce the probability of a dangerous event occurring again in the battery device, so as to achieve the purpose of reducing the possibility of insulation failure at multiple points causing short circuit ignition and other faults when, for example, multiple thermal runaway occurs in the battery device.

[0019] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0021] Figure 1 is a partial structural schematic diagram of a battery device provided in an exemplary embodiment of the present disclosure;

[0022] Figure 2 is a top view of a battery device provided in an exemplary embodiment of the present disclosure with a cover removed;

[0023] Figure 3 yes Figure 2 Cross-sectional view at the middle AA position;

[0024] Figure 4 yes Figure 3 A partial enlarged schematic diagram of position B in the middle;

[0025] Figure 5 is a schematic diagram of a pressure relief member, a shielding layer, and a structural member provided in a first embodiment of the present disclosure;

[0026] Figure 6 is a schematic diagram of a pressure relief member, a shielding layer, and a structural member provided in a second embodiment of the present disclosure;

[0027] Figure 7 Schematic diagram of the pressure relief member, shielding layer and structural member provided in the third embodiment of the present disclosure

[0028] Figure 8 is a schematic diagram of a multi-point thermal runaway circuit principle of a battery device provided in an exemplary embodiment of the present disclosure;

[0029] Figure 9 Schematic diagram of a structure of a structural member provided in an exemplary embodiment of the present disclosure.

[0030] Description of Reference Numerals

[0031] 1-battery cell; 110-pressure relief member; 2-housing; 210-structural member; 211-first surface; 212-second surface; 220-avoidance; 230-pressure relief channel; 240-bottom plate assembly; 241-first plate; 242-second plate; 243-exhaust channel; 3-shielding layer; 310-first structural layer; 320-second structural layer; 330-third structural layer; 4-adhesive layer; 5-cover plate. DETAILED DESCRIPTION

[0032] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0033] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the corresponding data protection laws and policies of the country where they are located and with the authorization given by the owner of the corresponding device.

[0034] In this disclosure, unless otherwise indicated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions within the space of a battery device when it is in use. "Inside" and "outside" refer to the inside and outside relative to the outline of the component or structure itself. In addition, it should be noted that the terms used, such as "first" and "second", are used to distinguish one element from another and do not have a sequential or importance relationship. In addition, in the description with reference to the accompanying drawings, the same reference numerals in different drawings represent the same elements.

[0035] According to a first aspect of the present disclosure, there is provided a battery device, Figures 1 to 9 As shown, the battery device includes a shell 2, a shielding layer 3 and a plurality of battery cells 1, the plurality of battery cells 1 are arranged in the shell 2, each battery cell 1 is provided with a pressure relief member 110, the shell 2 includes a structural member 210, a avoidance port 220 is formed on the structural member 210, the pressure relief member 110 faces the avoidance port 220, and the avoidance port 220 is used to form a pressure relief channel 230 of at least one pressure relief member 110; the shielding layer 3 is arranged circumferentially around the avoidance port 220 and is conductively connected to at least part of the wall surface of the avoidance port 220, the shielding layer 3 is used to block the conductive material discharged from the pressure relief member 110 and the structural member 210 when the battery cell 1 thermally runs away, and the resistivity of the shielding layer 3 is greater than the resistivity of the structural member 210 and less than the resistivity of the insulating material.

[0036] By the above technical solution, when the battery monomer 1 occurs thermal runaway, the conductive substance discharged by the pressure relief component 110 is blocked between the shielding layer 3 and the structural component 210, which can avoid the conductive substance discharged by the pressure relief component 110 directly contacting the structural component 210, that is, it can be understood that the conductive substance discharged by the pressure relief component 110 will be partially accumulated on the shielding layer 3 and will not directly contact the structural component 210, thereby reducing the possibility of insulation failure of the battery device. In addition, due to the presence of the shielding layer 3 (for example, the shielding layer 3 is arranged on the first surface 211 and the second surface 212 of the structural component 210, and the inner wall surface of the avoiding port 220 of the structural component 210, which will be described in detail below), and the resistivity of the shielding layer 3 is greater than the resistivity of the structural component 210 and less than the resistivity of the insulating material, so that the shielding layer 3 can play a role similar to resistance. In this way, when multiple points occur thermal runaway (that is, multiple pressure relief components 110 are opened to release pressure), even if a path is formed at the battery monomer 1, the shielding layer 3 and the structural component 210, so that for example, two battery monomers 1 where two pressure relief components 110 are located and the battery monomer 1 (if any) connected in series between the two battery monomers 1 are short-circuited through the structural component 210 and the shielding layer 3, but the shielding layer 3 can increase the resistance value of the path formed at the battery monomer 1, the shielding layer 3 and the structural component 210, so that an ampere-level discharge current can be generated on the path formed at the battery monomer 1, the shielding layer 3 and the structural component 210. This current can reduce the state of charge inside the battery monomer 1, so that the current in the path is reduced, thereby reducing the probability of a dangerous event occurring again in the battery device, so as to achieve the purpose of reducing the possibility of multiple points occurring insulation failure and causing short-circuit sparking and other faults when the battery device occurs multiple points thermal runaway.

[0037] It should be noted that in the related art, the metal component (for example, the above-mentioned structural component 210) that the conductive polymer may contact on the pressure relief path of the explosion-proof valve is insulated to prevent the possibility of multiple points occurring insulation failure and causing short-circuit sparking and other faults when the battery pack occurs multiple points thermal runaway, but this way will cause the circuit of the battery pack to fail, and all the use components and functions of the battery pack will fail.

[0038] In the present disclosure, since the resistivity of the shielding layer 3 is greater than the resistivity of the structural member 210, when, for example, multi-point thermal runaway occurs (i.e., when multiple pressure relief members 110 are opened to relieve pressure), when the conductive material sprayed onto the shielding layer 3 accumulates to a certain amount, it can connect the battery cells 1, the shielding layer 3 and the structural member 210 to form a path, so that, for example, the two battery cells 1 where the two pressure relief members 110 are located and the battery cells 1 connected in series between the two battery cells 1 (if any) are short-circuited through the structural member 210 and the shielding layer 3. However, due to the presence of the shielding layer 3 (for example, the shielding layer 3 is provided on the first surface 211 and the second surface 212 of the structural member 210, and on the inner wall surface of the avoidance opening 220 of the structural member 210, which will be described in detail below), the shielding layer 3 serves a purpose similar to resistance to increase the battery cells 1, The resistance value in the circuit (pathway) formed by the shielding layer 3 and the structural member 210 reduces the current of the circuit and reduces the possibility of malfunctions such as fire caused by excessive current in the circuit. In addition, since the resistivity of the shielding layer 3 is lower than the resistivity of the insulating material, the circuit will not be isolated and current will still flow through, so that the circuit in the battery device will not completely fail, and some functions of the battery device and electrical equipment can still be maintained. For example, some low-voltage functions can be maintained. For example, the status of the battery device can be monitored by the BMS system in the battery device. Therefore, the battery device provided in the first aspect of the present disclosure can not only reduce the possibility of malfunctions such as short circuit and ignition caused by insulation failure at multiple points, but also retain some functions of the battery device in the event of multi-point thermal runaway, and has high applicability.

[0039] In addition, it should be noted that the above-mentioned structural member 210 can be at least partially made of conductive material, and the shielding layer 3 can be conductively connected to the structural member 210, wherein the structural member 210 can be made of, for example, a metal material to be prepared as a metal member, and an insulating layer can be sprayed on the surface of the structural member 210 that is not arranged in contact with the shielding layer 3, thereby improving the safety of the battery device, and the connection between the avoidance 220 of the structural member 210 and the shielding layer 3 can be conductively connected, so that when the conductive material on the shielding layer 3 accumulates to a certain amount, it can connect the battery cell 1, the shielding layer 3 and the structural member 210 to form a path, and the resistivity of the shielding layer 3 is greater than that of the structure. The resistivity of the component 210 is lower than that of the insulating material, so that the shielding layer 3 serves a purpose similar to that of a resistor, so that an ampere-level discharge current can be generated in the path formed by the battery cell 1, the shielding layer 3 and the structural member 210. This current can reduce the state of charge inside the battery cell 1, thereby reducing the probability of a dangerous event occurring again in the battery device, so as to achieve the purpose of reducing the possibility of insulation failure at multiple points causing short circuits and ignition when, for example, multiple points of thermal runaway occur in the battery device. At the same time, some low-voltage functions can be maintained in operation. For example, the status of the battery device can be monitored by the BMS system in the battery device.

[0040] It should be noted that when the shielding layer 3 plays a role similar to a resistor, the resistance of the resistor should not be too small. If the resistance is too small, the discharge current will be large, which may easily lead to the risk of secondary thermal runaway. At the same time, the resistance of the resistor should not be too large. If the resistance is too large, the discharge current will be small, which will not be able to effectively reduce the state of charge inside the battery cell 1. For example, in some embodiments, the resistivity of the shielding layer 3 can be ρ, where 10 5 Ω·m ≤ ρ<10 10 Ω·m, so that the shielding layer 3 has a higher resistivity, which can not only meet the function of not isolating the circuit, but also meet the function of reducing the current.

[0041] In addition, since the resistivity of the shielding layer 3 is lower than that of the insulating material, for example, the resistivity of the insulating material is 10 10 Ω·m~10 22 Ω·m, therefore, the resistivity of the shielding layer 3 is less than 10 10 Ω·m, so that the shielding layer 3 will not completely block the connection of the current.

[0042] In addition, since the resistivity of the shielding layer 3 is greater than the resistivity of the structural member 210, for example, the structural member 210 can be made of conductive materials, such as metal materials, and the resistivity of the shielding layer 3 needs to be set to be greater than the resistivity of the structural member 210, so that the shielding layer 3 plays a role similar to a resistor, so as to increase the resistance value in the circuit (pathway) formed by the battery cell 1, the shielding layer 3 and the structural member 210, reduce the current of the circuit, and reduce the possibility of fault problems such as fire caused by excessive current in the circuit.

[0043] Based on the above, those skilled in the art can select a material with a suitable resistivity for the shielding layer 3 and design a suitable size to ensure that the current of the circuit that remains connected after thermal runaway meets the requirements. For example, the current I can meet the following requirements: 10 -10 A<I<10 -2 A. Under this current, it is still possible to collect information such as the temperature and voltage of the battery cell 1 and maintain some low-voltage operation functions without causing safety problems such as short circuit and ignition.

[0044] Among them, reference Figure 8 As shown, when a battery cell 1 experiences thermal runaway, its internal temperature rises. As the internal pressure rises, the pressure relief member 110 opens to relieve pressure. During this pressure relief process, a conductive material, such as a conductive polymer within the battery cell 1, is discharged. This releases pressure from the battery cell 1, causing an internal circuit breakage within the battery cell 1. However, the positive and negative electrodes of the battery cell 1 remain connected to the battery device's circuit. At this point, when the conductive material sprays onto the barrier layer 3 and reaches a certain volume, it can connect the battery cell 1, the barrier layer 3, and the structural member 210 to form a pathway. Furthermore, in the event of multi-point thermal runaway, i.e., when at least two battery cells 1 experience thermal runaway, these at least two battery cells 1 remain connected through the conductive material, the barrier layer 3, and the structural member 210, ensuring that the battery device's circuit remains connected, i.e., current continues to flow. If there are other battery cells 1 between the two battery cells 1 experiencing thermal runaway, these other battery cells 1 and the two battery cells 1 will be short-circuited by the temporary pathway formed by the conductive material, the barrier layer 3, and the structural member 210. Therefore, under the condition of thermal runaway of the battery cell 1, the circuit of the battery device may still remain connected again, so that the circuit of the battery device will not fail completely. As a result, some functions implemented by the circuit device can still operate, for example, some low-voltage functions can be maintained, for example, the status of the battery device can be monitored by the BMS system in the battery device, etc.

[0045] It should be noted that the aforementioned multiple battery cells 1 can be connected in series, or the multiple battery cells 1 can be grouped, with the multiple battery cells 1 in each group connected in series, while the battery cells 1 in each group are connected in parallel. In this way, even if at least two battery cells 1 in the multiple battery cells 1 connected in series experience thermal runaway, the technical solution of the present disclosure can still enable the circuit of the battery device to operate.

[0046] In addition, the material of the shielding layer 3 can be any suitable material that meets the requirements. For example, the shielding layer 3 can be a high-resistance material. For example, the shielding layer 3 can be at least one of an epoxy resin carbon nanotube layer, an epoxy resin graphite layer and an epoxy resin nickel powder layer. That is, it can be understood that the above-mentioned shielding layer 3 can be made of a single high-resistance material such as epoxy resin carbon nanotubes, epoxy resin graphite or epoxy resin nickel powder to form a single structural layer structure, or the shielding layer 3 can also be made of a high-resistance material such as epoxy resin carbon nanotubes, epoxy resin graphite or epoxy resin nickel powder. The materials are stacked to form a composite structural layer structure, which is not specifically limited in the present disclosure. The purpose is to enable the shielding layer 3 to serve a purpose similar to that of a resistor, so that an ampere-level discharge current can be generated on the path formed by the battery cell 1, the shielding layer 3 and the structural member 210. This current can reduce the state of charge inside the battery cell 1, thereby reducing the probability of a dangerous event occurring again in the battery device, so as to achieve the purpose of reducing the possibility of insulation failure at multiple points causing short circuits and ignition when, for example, multiple points of thermal runaway occur in the battery device.

[0047] It should be noted that the above-mentioned epoxy resin carbon nanotubes, epoxy resin graphite and epoxy resin nickel powder are all high-resistance materials that can be obtained by those skilled in the art through preparation processes known in the art, and are not described in detail in this disclosure.

[0048] In addition, the thickness of the shielding layer 3 can be designed taking into account impedance, weight, cost, energy density, and voltage resistance.

[0049] Based on this, in some embodiments, the thickness of the shielding layer 3 can be D, the capacity of the battery cell 1 can be Q, and 0.02Ah / μm<Q / D<1.5Ah / μm. Therefore, the thickness of the shielding layer 3 is set by comprehensively considering the capacity of the battery cell 1, so that the thickness of the shielding layer 3 can take into account various aspects such as impedance, weight, cost, energy density and voltage resistance. Among them, when Q / D is less than or equal to 0.02Ah / μm, the thickness D of the shielding layer 3 is large enough to meet the impedance requirements, but the shielding layer 3 will take up too much space and increase weight and cost, affecting the overall energy density of the battery device; when Q / D is greater than or equal to 1.5Ah / μm, the thickness D of the shielding layer 3 is too thin and cannot meet the voltage resistance requirements of the battery device.

[0050] In addition, in some embodiments, the thickness of the shielding layer 3 can be D, the system voltage of the battery device can be U, and 0.2 m / V < U / D < 2.5 m / V. In this way, the thickness of the shielding layer 3 is set in consideration of the system voltage, so that the thickness of the shielding layer 3 can take into account the impedance, weight, cost, energy density, and voltage resistance, and the like. When U / D is less than or equal to 0.2 m / V, the thickness D of the shielding layer 3 is large enough to meet the impedance requirement, but occupies too much space and increases the weight and cost, affecting the overall energy density of the battery device. When U / D is greater than or equal to 2.5 m / V, the thickness D of the shielding layer 3 is too thin to meet the insulation voltage resistance requirement of the battery device.

[0051] In addition, the thickness of the shielding layer 3 can be set by balancing the relationship between the thickness of the shielding layer 3 and the resistance of the shielding layer 3, for example, the thickness of the shielding layer 3 can be D, the resistance of the shielding layer can be R, 10 8 Ω / m < R / D < 10 14 Ω / m. When R / D is greater than or equal to 10 14 Ω / m, the thickness of the shielding layer 3 is too thin to meet the voltage resistance requirement of the battery device, and the process feasibility of the shielding layer 3 is low, and the risk of leakage is high. When R / D is less than or equal to 10 8 Ω / m, the thickness of the shielding layer 3 is too thick to meet the impedance requirement, but the shielding layer 3 occupies too much space and increases the weight and cost, affecting the overall energy density of the battery device.

[0052] Of course, it should be noted that the thickness D of the shielding layer 3 can also be set by considering the capacity Q of the battery monomer 1, the system voltage U, and the resistance R of the shielding layer 3. In this way, by considering various aspects, the design of the shielding layer 3 can be optimized, so that the shielding layer 3 can be used as a resistor while also taking into account the weight, cost, energy density, voltage resistance, and the like of the battery device (battery pack).

[0053] In the embodiments provided by the present disclosure, the thickness of each part of the shielding layer 3 can be consistent, or the thickness of each part of the shielding layer 3 can not be consistent. When the thickness of each part of the shielding layer 3 is not consistent, the above thickness D can be the maximum value of the thickness of the shielding layer 3.

[0054] For example, the thickness D of the shielding layer 3 can be, for example, 0.1 mm-5 mm, so that the shielding layer 3 can be used as a resistor while also taking into account the weight, cost, energy density, voltage resistance, and the like of the battery device (battery pack). The present disclosure is not limited thereto.

[0055] In some embodiments, the thickness of the shielding layer 3 can be set by considering the capacity Q of the battery monomer 1, the system voltage U, and the resistance R of the shielding layer 3, for example, the thickness of the shielding layer 3 can be D, the capacity of the battery monomer 1 can be Q, the system voltage can be U, and the resistance of the shielding layer can be R, 0.2 m / V < U / D < 2.5 m / V, and 10 Figure 5As shown, the outer wall surface of the shielding layer 3 facing the battery cell 1 may include a plane, which is opposite to and parallel to the bottom surface of the battery cell 1. For example, the shielding layer 3 may include a first structural layer 310, a second structural layer 320, and a third structural layer 330. The first structural layer 310 is arranged on the first surface 211 of the structural member 210 facing the battery cell 1, the second structural layer 320 is arranged on the second surface 212 of the structural member 210 facing away from the battery cell 1, and the third structural layer 330 is connected between the first structural layer 310 and the second structural layer 320 and is arranged in contact with the inner wall surface of the avoidance opening 220. Therefore, through this arrangement of the shielding layer 3, the shielding layer 3 can better shield the edge area of ​​the avoidance opening 220 to prevent the conductive material ejected from the pressure relief member 110 from contacting the structural member 210, wherein, Figure 5 It is exemplarily shown that the upper surface of the first structural layer 310 facing the battery cell 1 may include the above-mentioned plane, so as to facilitate the accumulation of the conductive material discharged from the pressure relief member 110 on the shielding layer 3 .

[0056] Or, alternatively, as Figure 6 As shown, the outer wall surface of the shielding layer 3 facing the battery cell 1 may also include an inclined surface, which extends obliquely toward the inner side of the avoidance opening 220 and away from the pressure relief member 110, wherein: Figure 6 It is exemplarily shown that the upper surface of the first structure layer 310 facing the battery cell 1 may include the above-mentioned inclined surface.

[0057] Or, alternatively, as Figure 7 As shown, the outer wall surface of the shielding layer 3 facing the battery cell 1 may also include a step surface, which is arranged in a step-like manner toward the inner side of the avoidance opening 220 and gradually away from the pressure relief member 110, wherein: Figure 7 It is exemplified that the upper surface of the first structural layer 310 facing the battery cell 1 may include the above-mentioned step surface, or the upper surface of the first structural layer 310 facing the battery cell 1 and the inner side surface of the third structural layer 330 facing the center of the pressure relief channel 230 may form the above-mentioned step surface. The present disclosure does not specifically limit such deformation methods. Those skilled in the art may adaptively design the external structure of the shielding layer 3 according to actual application requirements, with the purpose of facilitating the accumulation of conductive materials discharged from the pressure relief component 110 on the shielding layer 3.

[0058] In addition, in some embodiments, the shielding layer 3 may be a coating provided on the structural member 210 . For example, the shielding layer 3 may be formed on the structural member 210 by spray coating.

[0059] Alternatively, the shielding layer 3 may also be bonded to the structural member 210 , for example, by applying glue or using double-sided tape, wherein the glue used may be conductive glue.

[0060] Alternatively, the shielding layer 3 may also be welded to the supporting portion. The present disclosure does not specifically limit such deformation mode, and those skilled in the art may adaptively design it according to actual application requirements.

[0061] In some embodiments, reference Figure 5 As shown, in a first direction perpendicular to the centerline of the escape opening 220, the distance between the edge of the escape opening 220 and the outer edge of the pressure relief member 110 can be d1, and in the first direction, the width of the first structural layer 310 can be d2, where 1 < d2 / d1 < 3. Considering that when d2 / d1 is less than or equal to 1, the coverage area of ​​the first structural layer 310 is too small and may not effectively block the conductive material, while when d2 / d1 > 3, the coverage area of ​​the first structural layer 310 is too large, and a large portion of the first structural layer 310 is not in the ejection (pressure relief) path of the pressure relief member 110, resulting in ineffective coverage, which increases cost and weight. Therefore, by ensuring that 1 < d2 / d1 < 3, the relationship between the ejection path of the pressure relief member 110 and the coverage area of ​​the first structural layer 310 can be balanced, so that the first structural layer 310 can meet the requirements of blocking the conductive material and the structural member 210 while avoiding occupying excess space.

[0062] in, Figure 5 The figure shows the ejection (pressure relief) coverage area H of the pressure relief member 110 by way of example. Since the internal air pressure of the battery cell 1 is relatively high when the battery cell 1 is pressure-relieved, after the pressure relief member 110 is opened, the ejection coverage area H is ejected in a shape similar to the side of a truncated cone, thereby enabling the conductive material discharged by the pressure relief member 110 to partially accumulate on the shielding layer 3.

[0063] In some embodiments, reference Figure 5 As shown, in a first direction perpendicular to the centerline of the escape opening 220, the width of the first structural layer can be d2. In a second direction along the centerline of the escape opening 220, the distance between the bottom of the pressure relief member 110 facing the escape opening 220 and the first surface 211 of the structural member 210 is d3, where 3 < d2 / d3 < 6.25. Considering that when d2 / d3 is less than 3, the coverage area of ​​the first structural layer 310 is too small and cannot effectively block the flow. When d2 / d3 > 6.25, the coverage area of ​​the first structural layer 310 is too large, and a large portion of the first structural layer 310 is not in the ejection path of the pressure relief member 110, resulting in ineffective coverage. Therefore, by ensuring that 3 < d2 / d3 < 6.25, the relationship between the ejection path of the pressure relief member 110 and the coverage area of ​​the first structural layer 310 can be balanced, allowing the first structural layer 310 to meet the requirements of blocking the conductive material and structural members while avoiding occupying excess space.

[0064] The centerline of the escape opening 220 may be a virtual line passing through the centroid of the escape opening 220 and perpendicular to the first surface 211. In some embodiments, the second direction along the centerline of the escape opening 220 may refer to the height direction of the battery device (battery pack) or the connection direction between the battery cells 1 of the battery device (battery pack) and the structural member 210. The first direction may be any direction perpendicular to the second direction, for example, the first direction may be the length direction or width direction of the battery device (battery pack).

[0065] In addition, the multiple battery cells 1 are bonded to the structural member 210 via an adhesive layer 4 to secure the multiple battery cells 1 using the structural member 210. The adhesive layer 4 may be a structural adhesive. Along the second direction, the thickness of the adhesive layer 4 is equal to the distance between the bottom of the pressure relief member 110 facing the avoidance opening 220 and the first surface 211 of the structural member 210 (i.e., the thickness of the adhesive layer 4 along the second direction may be equal to the aforementioned d3). Thus, by adjusting the thickness of the structural adhesive, the value of d3 can be controlled.

[0066] In some embodiments, reference Figures 1 to 9 As shown, the housing 2 may include a bottom plate assembly 240 that supports a plurality of battery cells 1. The bottom plate assembly 240 includes a first plate 241 and a second plate 242 that are arranged relatively to each other. An exhaust channel 243 is formed between the first plate 241 and the second plate 242. The first plate 241 is the above-mentioned structural member 210, and the avoidance port 220 is used to connect the pressure relief member 110 and the exhaust channel 243. In this way, when thermal runaway occurs, the pressure relief member 110 can relieve pressure through the exhaust channel 243. In addition, a cover plate 5 may be provided on the housing 2 to protect the relevant components in the housing 2. The present disclosure does not specifically limit the specific structure of the cover plate 5 and the connection method to the housing 2. Those skilled in the art can design it adaptively according to actual application requirements.

[0067] The first plate 241 may include a cooling plate, which may be a liquid cooling plate, for example, to cool the battery cells 1 and to cool down the battery cells 1 when thermal runaway occurs. The avoidance opening 220 may be provided on the cooling plate.

[0068] Or, alternatively, the first plate 241 may include a plate body, which is used to support the plurality of battery cells 1 to play a supporting role, wherein the above-mentioned avoidance opening 220 may be provided on the plate body.

[0069] In addition, the pressure relief component 110 may adopt any suitable structure according to actual application requirements. For example, the pressure relief component 110 may be an explosion-proof valve, a pressure relief valve, or a safety valve, etc., and the present disclosure does not make any specific limitations on this.

[0070] In addition, the battery device may be, for example, a battery pack, or other energy storage forms such as a flow battery device, etc., which is not specifically limited in the present disclosure.

[0071] It should be noted that the battery cell 1 can be constructed in the form of a battery cell, for example. The battery cell is the smallest discharge power source in the battery device, which includes positive and negative electrode separators and a battery cell shell.

[0072] According to a second aspect of the present disclosure, an electrical device is provided, comprising the battery device provided in the first aspect. The electrical device has all the advantages of the battery device provided in the first aspect, which will not be described in detail in this disclosure.

[0073] In some exemplary application scenarios, the above-mentioned electrical equipment may be a vehicle, wherein the vehicle may be a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc., and this disclosure does not make any specific limitations on this.

[0074] Of course, in other application scenarios, the above-mentioned electrical equipment can also be vehicles that need to be powered by battery packs, such as in the energy storage field, aerospace or water transportation.

[0075] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0076] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0077] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A battery device, characterized in that: include: A plurality of battery cells, each of which is provided with a pressure relief member; a housing, wherein the plurality of battery cells are disposed within the housing, the housing comprising a structural member, a relief opening being formed on the structural member, the pressure relief member facing the relief opening, the relief opening being used to form a pressure relief channel for at least one of the pressure relief members; as well as A shielding layer is arranged circumferentially around the avoidance opening and is conductively connected to at least a portion of the wall surface of the avoidance opening. The shielding layer is used to block the conductive material discharged by the pressure relief component and the structural component when the battery cell thermally runs away. The resistivity of the shielding layer is greater than the resistivity of the structural component and less than the resistivity of the insulating material.

2. The battery device according to claim 1, wherein: The resistivity of the shielding layer is ρ, where 10 5 Ω·m ≤ ρ<10 10 Ω·m.

3. The battery device according to claim 1 or 2, characterized in that The shielding layer is at least one of an epoxy resin carbon nanotube layer, an epoxy resin graphite layer, and an epoxy resin nickel powder layer.

4. The battery device according to claim 1, wherein: The thickness of the shielding layer is D, the capacity of the battery cell is Q, and 0.02 Ah / μm<Q / D<1.5 Ah / μm.

5. The battery device according to claim 1, wherein: The thickness of the shielding layer is D, the system voltage of the battery device is U, and 0.2m / V<U / D<2.5m / V.

6. The battery device according to claim 1, wherein: The thickness of the shielding layer is D, and the resistance of the shielding layer is R, 10 8 Ω / m<R / D<10 14 Ω / m.

7. The battery device according to claim 1, wherein: In a first direction perpendicular to the center line of the avoidance opening, the distance between the edge of the avoidance opening and the outer edge of the pressure relief member is d1, and the shielding layer includes a first structural layer, which is arranged on the first surface of the structural member facing the battery cell. In the first direction, the width of the first structural layer is d2, wherein 1<d2 / d1<3.

8. The battery device according to claim 1, wherein: The shielding layer includes a first structural layer, which is arranged on the first surface of the structural member facing the battery cell. In a first direction perpendicular to the center line of the avoidance opening, the width of the first structural layer is d2, and in a second direction along the center line of the avoidance opening, the distance between the bottom of the pressure relief member facing the avoidance opening and the first surface of the structural member is d3, wherein 3<d2 / d3<6.

25.

9. The battery device according to claim 8, characterized in that The plurality of battery cells are bonded to the structural member via an adhesive layer. Along the second direction, a thickness of the adhesive layer is equal to a distance between a bottom portion of the pressure relief member facing the escape opening and the first surface of the structural member.

10. The battery device according to claim 1, wherein: The shielding layer is a coating provided on the structural member, or the shielding layer is adhered to the structural member, or the shielding layer is welded to the structural member.

11. The battery device according to claim 1, wherein: The outer wall surface of the shielding layer facing the battery cell includes a plane, and the plane is opposite to and parallel to the bottom surface of the battery cell; or, The outer wall surface of the shielding layer facing the battery cell includes an inclined surface, and the inclined surface extends obliquely toward the inner side of the avoidance opening and away from the pressure relief member; or, The outer wall surface of the shielding layer facing the battery cell includes a step surface, and the step surface is arranged in a step shape facing the inner side of the escape opening and gradually away from the pressure relief member.

12. The battery device according to claim 11, wherein: The shielding layer includes a first structural layer, a second structural layer, and a third structural layer, wherein the first structural layer is arranged on a first surface of the structural member facing the battery cell, the second structural layer is arranged on a second surface of the structural member facing away from the battery cell, and the third structural layer is connected between the first structural layer and the second structural layer and is arranged in contact with the inner wall surface of the avoidance opening; The upper surface of the first structural layer facing the battery cell includes the plane; or, The upper surface of the first structural layer facing the battery cell includes the inclined surface; or, The upper surface of the first structural layer facing the battery cell includes the step surface; or, The step surface is formed on the upper surface of the first structural layer facing the battery cell and on the inner side surface of the third structural layer facing the center of the pressure relief channel.

13. The battery device according to claim 1, wherein: The housing includes a bottom plate assembly supporting the plurality of battery cells, the bottom plate assembly includes a first plate and a second plate arranged opposite to each other, an exhaust passage is formed between the first plate and the second plate, the first plate is the structural member, and the avoidance is used to connect the pressure relief member and the exhaust passage; Wherein, the first plate comprises a cooling plate for cooling the plurality of battery cells; or, The first plate includes a plate body, and the plate body is used to support the plurality of battery cells.

14. An electrical device, characterized in that: A battery device comprising any one of claims 1 to 13.

Images