Battery device and electric device

Abstract

The embodiment of the invention discloses a battery device and a power utilization device. The battery device includes: a case; the plurality of battery monomer assemblies are arranged along a first direction, a first battery monomer assembly comprises a plurality of battery monomers arranged along a second direction, each battery monomer is provided with a first wall, and the first wall faces a first box body wall of the box body along a gravity direction; and the plurality of liquid leakage detection assemblies are in one-to-one correspondence with the plurality of battery monomer assemblies, the first liquid leakage detection assembly is located between the first walls of the plurality of battery monomers and the first box body wall, and the first liquid leakage detection assembly is used for detecting whether electrolyte leakage occurs in the plurality of battery monomers. According to the battery device and the power utilization device, whether the single battery leaks liquid or not can be detected, and the reliability of the battery device is improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery device and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] A battery device comprises multiple individual cells, each containing an electrolyte. Due to manufacturing limitations, there is a risk of electrolyte leakage from individual cells during use, which can affect the operational safety of the entire battery device. Therefore, it is essential to detect electrolyte leakage from individual cells. Summary of the Invention

[0004] This application provides a battery device and an electrical device that can detect whether a single battery cell is leaking, thereby improving the reliability of the battery device.

[0005] In a first aspect, a battery device is provided, comprising: a housing, the housing including a first housing wall; a plurality of battery cell assemblies arranged along a first direction, the plurality of battery cell assemblies being housed in the housing, wherein a first battery cell assembly of the plurality of battery cell assemblies includes a plurality of battery cells arranged along a second direction, each of the plurality of battery cells containing an electrolyte, each battery cell having a first wall facing the first housing wall in the direction of gravity; and a plurality of leakage detection components, each of the plurality of leakage detection components corresponding one-to-one with the plurality of battery cell assemblies, wherein a first leakage detection component of the plurality of leakage detection components corresponds to the first battery cell assembly, the first leakage detection component being located between the first wall of the plurality of battery cells and the first housing wall, the first leakage detection component being used to detect whether electrolyte leakage has occurred in the plurality of battery cells.

[0006] Therefore, the battery device of this application contains individual battery cells, wherein the first wall of the individual battery cell faces the first housing wall along the direction of gravity, and this individual battery cell is at risk of leakage. Since the battery device contains multiple leakage detection components, and these multiple leakage detection components correspond one-to-one with multiple individual battery cell assemblies, different leakage detection components detect different individual battery cell assemblies. Therefore, compared to using a single leakage detection component to detect all individual battery cells, the battery device of this application can determine the specific individual battery cell assembly that is leaking when a leakage occurs in any individual battery cell assembly, thereby improving the accuracy of leakage detection. For example, if an electrolyte leaks from a individual battery cell in the first individual battery cell assembly, the electrolyte falls to the first leakage detection component below under gravity, and the sampling terminal of the first leakage detection component collects and confirms that a leakage has occurred in that individual battery cell assembly.

[0007] In some embodiments, the first leakage detection component includes a first insulating layer and a sampling terminal. The first insulating layer is fixed to the first housing wall, and the material of the first insulating layer cannot be swollen by the electrolyte. The sampling terminal is located on the side of the first insulating layer away from the first housing wall, and is used to detect whether electrolyte leakage has occurred in the plurality of battery cells. Because the leakage detection component is provided with a first insulating layer that cannot be swollen by the electrolyte, and considering that the first housing wall of the housing is typically made of metal, if electrolyte leakage occurs in multiple battery cells corresponding to different leakage detection components, then under the insulating effect of the first insulating layer, multiple leakage points cannot or are difficult to electrically connect through the first housing wall, thereby improving the insulation reliability of the battery device.

[0008] In some embodiments, the first leakage detection component further includes a second insulating layer, with the sampling terminal located between the first and second insulating layers. The material of the second insulating layer is capable of swelling with the electrolyte. When no electrolyte leakage occurs in the battery cell, the second insulating layer improves the insulation reliability between the sampling terminal and the battery cell. In the event of electrolyte leakage, the second insulating layer can swell or even fuse with the electrolyte, allowing the sampling terminal to promptly collect the leaked electrolyte without affecting the first leakage detection component's ability to determine whether an electrolyte leak has occurred.

[0009] In some embodiments, the first insulating layer has a first groove with an opening facing the second insulating layer, and at least a portion of the sampling terminal is located in the first groove; and / or, the second insulating layer has a second groove with an opening facing the first insulating layer, and at least a portion of the sampling terminal is located in the second groove. This can reduce the space occupied by the sampling terminal.

[0010] In some embodiments, the first insulating layer has a third groove with an opening facing the first battery cell assembly, and the bottom wall of the third groove covers the orthographic projection of the first wall of the plurality of battery cells toward the bottom wall of the third groove. In the event of electrolyte leakage in a battery cell, the leaked electrolyte is located within the third groove and cannot further diffuse to the outside of the first leakage detection assembly. That is, the third groove can be used to effectively contain the diffusion of leaked electrolyte, reduce the risk of leaked electrolyte corroding battery cells in other battery cell assemblies, and thus reduce the risk of multi-point leakage within the entire battery device.

[0011] In some embodiments, the second insulating layer is located within the third groove, and the thickness of the second insulating layer is less than the depth of the third groove. In the event of electrolyte leakage, even if the second insulating layer is not completely swollen, electrolyte overflow into the third groove can be reduced, thereby further reducing the risk of electrolyte diffusion.

[0012] In some embodiments, the sampling terminal includes a first metal wire and a second metal wire arranged in parallel. The battery device includes a control component. A first end of the first metal wire and a first end of the second metal wire are connected to the control component, while a second end of the first metal wire and a second end of the second metal wire are disconnected. The control component is used to detect whether electrolyte is present, thus electrically connecting the first metal wire and the second metal wire. In this way, if there is no electrolyte leakage in the battery cell, the first metal wire and the second metal wire are disconnected; if there is electrolyte leakage in the battery cell, the leaked electrolyte can conduct electricity between the first metal wire and the second metal wire. Since the first end of the first metal wire and the first end of the second metal wire are connected to the control component, the control component can determine whether electrolyte leakage has occurred based on the continuity state between the first metal wire and the second metal wire.

[0013] In some embodiments, the control component includes a first resistor and a second resistor. A first end of the first resistor is connected to a power source, and a second end of the first resistor is connected to the first end of the second resistor. The second end of the second resistor is grounded. The sampling terminal is connected in series with the first resistor and in parallel with the second resistor through the first end of the first metal wire and the first end of the second metal wire. The control component is also used to determine whether electrolyte leakage has occurred in the plurality of battery cells based on the voltage at the second end of the first resistor. The circuit structure is simple and easy to implement.

[0014] In some embodiments, the first resistor and the second resistor have equal resistance values; wherein the control component is further configured to: determine that the plurality of battery cells have experienced electrolyte leakage if the voltage at the second terminal of the first resistor is greater than half the voltage of the power supply, or determine that the plurality of battery cells have not experienced electrolyte leakage if the voltage at the second terminal of the first resistor is equal to half the voltage of the power supply. Having equal resistance values ​​facilitates calculation.

[0015] In some embodiments, the sampling terminal includes a plurality of repeating segments arranged along the second direction and connected end-to-end. Each repeating segment includes a connected first segment and a second segment. Both the first segment and the second segment extend along the width direction of the first leakage detection component. The first end of the first segment is the starting end of each repeating segment, and the first end of the second segment is the ending end of each repeating segment. The second ends of the first segment and the second ends of the second segment are connected. The plurality of repeating segments included in the sampling terminal can have the same shape and size, which facilitates processing and allows for the formation of a more uniformly distributed sampling terminal for detecting electrolyte leaks in different areas, thereby improving detection accuracy.

[0016] In some embodiments, the first segment and the second segment are both straight segments, and the clamp between the first segment and the second segment is an acute angle. This arrangement is simple to process and evenly distributed, which can improve the processing efficiency and detection effect of the first leakage detection component.

[0017] In some embodiments, the first segment includes a plurality of first portions that are bent and connected to each other; and / or, the second segment includes a plurality of second portions that are bent and connected to each other to increase the length of the sampling terminal, such that each repeating segment can occupy a larger area of ​​the first insulating layer, further increasing the coverage area of ​​the sampling terminal to improve the electrolyte detection accuracy.

[0018] In some embodiments, the first portion of the plurality of first portions connected to the second end of the second segment is a straight line segment, and the second portion of the plurality of second portions connected to the second end of the first segment is a straight line segment; or, the first portion of the plurality of first portions connected to the second end of the second segment is an arc segment, and the second portion of the plurality of second portions connected to the second end of the first segment is an arc segment. The structure is simple and easy to implement.

[0019] In some embodiments, the first segment includes three first parts and the second segment includes three second parts, so that multiple repeating segments are interconnected by a smaller number of first parts and second parts.

[0020] In some embodiments, the three first portions are all straight line segments, the three second portions are all straight line segments, and adjacent first portions are perpendicular to each other, as are adjacent second portions. This allows the sampling terminals to cover as much area as possible.

[0021] In some embodiments, the plurality of repeating segments correspond one-to-one with the plurality of battery cells, so that the length and distribution of the sampling terminals below the plurality of battery cells are approximately the same, so that in the event of electrolyte leakage in any battery cell, it can be detected in time by the sampling terminals below.

[0022] In some embodiments, each battery cell further includes a second wall opposite to the first wall, and the housing further includes a second housing wall opposite to the first housing wall. The second wall is fixed to the first housing wall, thereby achieving relative fixation between the battery cell and the housing. A gap exists between the surface of the first wall facing the first leakage detection component and the surface of the first leakage detection component facing the first wall. This gap can be used to increase the insulation reliability between the battery cell and the first leakage detection component, especially the insulation reliability between the battery cell and the terminals.

[0023] In some embodiments, the first wall is provided with at least one of the following components: an electrode terminal, a pressure relief mechanism, and a liquid injection structure, so that electrolyte leakage occurring in at least one of the electrode terminal, the pressure relief mechanism, and the liquid injection structure can be detected by a leakage detection assembly.

[0024] In some embodiments, each battery cell further includes: a housing, which is a hollow structure with an opening; and a cover plate for covering the opening of the housing, the cover plate being the first wall. The cover plate can be used to house at least one component of the electrode terminals, pressure relief mechanism, and electrolyte injection structure to improve the integration of the battery cell and facilitate manufacturing. Furthermore, electrolyte leakage may occur at the welded area between the cover plate and the housing, and the leakage detection component can also be used to detect electrolyte leakage occurring between the cover plate and the housing.

[0025] In a second aspect, an electrical device is provided, comprising: a battery device as described in the first aspect or any embodiment of the first aspect, the battery device being used to supply power to the electrical device.

[0026] In some embodiments, the electrical device is a vehicle, a ship, or a spacecraft. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a vehicle according to one embodiment of this application;

[0028] Figure 2This is an exploded view of a partial structure of a battery device according to an embodiment of this application;

[0029] Figure 3 This is a schematic diagram of the structure of a first battery cell assembly and a corresponding first leakage detection assembly according to an embodiment of this application;

[0030] Figure 4 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0031] Figure 5 This is an exploded structural diagram of a battery cell according to an embodiment of this application;

[0032] Figure 6 This is a cross-sectional schematic diagram of a battery cell and a corresponding first leakage detection component according to an embodiment of this application;

[0033] Figure 7 This is a cross-sectional schematic diagram of a first leakage detection component according to an embodiment of this application;

[0034] Figure 8 This is another cross-sectional schematic diagram of a first leakage detection component according to an embodiment of this application;

[0035] Figure 9 This is another cross-sectional schematic diagram of a first leakage detection component according to an embodiment of this application;

[0036] Figure 10 This is a schematic diagram of the structure of a first leakage detection component according to an embodiment of this application;

[0037] Figure 11 This is a schematic diagram of the connection circuit between the sampling terminal and the control component according to one embodiment of this application;

[0038] Figure 12 This is a top view schematic diagram of a first leakage detection component according to an embodiment of this application;

[0039] Figure 13 This is a schematic diagram of a repeating segment according to an embodiment of this application;

[0040] Figure 14 This is a top view schematic diagram of a first leakage detection component according to another embodiment of this application;

[0041] Figure 15 This is a schematic diagram of a repeating segment according to another embodiment of this application.

[0042] The accompanying drawings are not drawn to scale. Detailed Implementation

[0043] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0046] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0049] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0050] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0051] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0052] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0053] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0054] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0055] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also be provided one or more.

[0056] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0057] In some embodiments, a pressure relief mechanism is provided on the casing. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0058] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby creating an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0059] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0060] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0061] The term "actuation" as used in this application refers to the activation or actuation of the pressure relief mechanism to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the mechanism, etc. When the pressure relief mechanism is activated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the activated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0062] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for venting gas inside the battery cell.

[0063] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0064] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0065] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0066] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0067] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0068] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0069] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0070] As an example, the enclosure may include a first enclosure section and a second enclosure section. The first enclosure section and the second enclosure section are fastened together to form a closed space inside the enclosure for housing the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure section may be a top cover or a bottom plate.

[0071] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0072] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0073] During the use of battery devices, due to limitations in the manufacturing process of individual battery cells, electrolyte leakage is likely to occur, leading to a series of safety issues. For example, in pursuit of higher capacity and safety, battery devices are often designed in an inverted configuration, with the electrode terminals of the battery cells facing downwards along the direction of gravity. In such inverted battery devices, because the electrode terminals and their surrounding walls are usually not integrally formed, electrolyte leakage is prone to occur in the area where the electrode terminals are located. How to detect electrolyte leakage in the individual battery cells within a battery device is a problem that urgently needs to be solved.

[0074] This application provides a battery device and an electrical device that can solve the above-mentioned problems. The battery device of this application includes a housing, individual battery cells, and multiple leakage detection components. Specifically, the housing contains multiple battery cell assemblies arranged along a first direction. Taking a first battery cell assembly as an example, the first battery cell assembly includes multiple battery cells arranged along a second direction. Each battery cell contains electrolyte, and each battery cell has a first wall that faces the first housing wall along the direction of gravity. Multiple leakage detection components correspond one-to-one with the multiple battery cell assemblies. Specifically, the first leakage detection component corresponds to the first battery cell assembly. This first leakage detection component is located between the first wall of the multiple battery cells in the first battery cell assembly and the first housing wall. This first leakage detection component is used to detect whether electrolyte leakage has occurred in the multiple battery cells.

[0075] The battery device of this application contains individual battery cells, wherein the first wall of each battery cell faces the first housing wall along the direction of gravity, and this battery cell is at risk of leakage. Since the battery device contains multiple leakage detection components, and these multiple leakage detection components correspond one-to-one with multiple battery cell assemblies, different leakage detection components detect different battery cell assemblies. Therefore, compared to using a single leakage detection component to detect all battery cells, the battery device of this application can determine the specific battery cell assembly that is leaking when a battery cell in any battery cell assembly leaks, thereby improving the accuracy of leakage detection. For example, if an electrolyte leaks from a battery cell in the first battery cell assembly, the electrolyte falls to the first leakage detection component below under gravity, and the sampling terminal of the first leakage detection component collects and confirms that a battery cell in the first battery cell assembly is leaking.

[0076] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0077] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0078] For example, such as Figure 1The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 60, a controller 50, and a battery device 10 can be installed inside vehicle 1. The controller 50 controls the battery device 10 to supply power to the motor 60. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, for the electrical system of vehicle 1, such as for the power requirements of vehicle 1's starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0079] Figure 2 An exploded view of a portion of the structure of the battery device 10 according to an embodiment of this application is shown. Figure 2 As shown, the battery device 10 of this application embodiment includes a housing 11, a plurality of battery cell assemblies 200 arranged along a first direction, and a plurality of leakage detection assemblies 300. Specifically, the housing 11 includes a first housing wall 113; the plurality of battery cell assemblies 200 are housed in the housing 11, and the first battery cell assembly 210 of the plurality of battery cell assemblies 200 includes a plurality of battery cells 20 arranged along a second direction. Each of the plurality of battery cells 20 contains electrolyte inside, and each battery cell 20 has a first wall 201, which faces the first housing wall 113 along the direction of gravity; the plurality of leakage detection components 300 correspond one-to-one with the plurality of battery cell assemblies 200, and the first leakage detection component 30 of the plurality of leakage detection components 300 corresponds to the first battery cell assembly 210. The first leakage detection component 30 is located between the first wall 201 of the plurality of battery cells 20 and the first housing wall 113, and the first leakage detection component 30 is used to detect whether electrolyte leakage has occurred in the plurality of battery cells 20.

[0080] It should be understood that, such as Figure 2 As shown, the housing 11 of the battery device 10 in this embodiment can be used to accommodate multiple battery cells 20. The housing 11 in this embodiment has a hollow structure, and the multiple battery cells 20 are accommodated inside the housing 11.

[0081] It should be understood that the structure of the housing 11 in this application embodiment can be configured according to actual applications. For example, the housing 11 may include two parts, referred to herein as a first housing part 111 and a second housing part 112, which are fastened together. The shapes of the first housing part 111 and the second housing part 112 can be determined according to the shape of the components housed inside, for example, according to the shape of a combination of multiple battery cells 20 housed inside. At least one of the first housing part 111 and the second housing part 112 has an opening. For example, as... Figure 2 As shown, the first housing portion 111 and the second housing portion 112 can both be hollow cuboids with one open side each. The openings of the first housing portion 111 and the second housing portion 112 are opposite to each other, and the first housing portion 111 and the second housing portion 112 are interlocked to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. The multiple battery cells 20 are connected in parallel, series, or mixed and placed inside the housing 11 formed by the interlocking of the first housing portion 111 and the second housing portion 112.

[0082] For example, unlike Figure 2 As shown, either the first housing portion 111 or the second housing portion 112 may have only one hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the second housing portion 112 as a hollow cuboid with one opening and the first housing portion 111 as a plate-shaped example, then the first housing portion 111 covers the opening of the second housing portion 112 to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0083] It should be understood that the housing 11 in this embodiment can be a polyhedral structure, and the first housing wall 113 is the bottom wall of the housing 11, that is, after the battery device 10 is assembled, the first housing wall 113 is located at the bottom of the battery device 10 along the direction of gravity. For example, as Figure 2 As shown, the first wall 113 can be the bottom wall of the second box section 112 located below.

[0084] Furthermore, for ease of description, this application primarily uses a near-rectangular-pitch battery device 10 as an example. Based on this rectangular-pitch battery device 10, this application defines three reference directions: the length direction of the battery device 10 is direction X, the width direction is direction Y, and the height direction is direction Z. The length direction X, width direction Y, and height direction Z of the battery device 10 are perpendicular to each other, and the dimension of the width direction Y of the battery device 10 is smaller than the dimension of the length direction X.

[0085] The battery device 10 of this application embodiment may include a plurality of battery cells 20 to meet different power usage requirements. The shape of the battery cell 20 in this application embodiment can be set according to actual application. For example, the battery cell 20 can be as follows: Figure 2 The cylindrical shape shown, or it could be different. Figure 2 The embodiments shown may be cuboids or other shapes, but are not limited to these.

[0086] In some embodiments, to improve the space utilization within the battery device 10, the battery cells 20 within the battery device 10 are typically arranged in a certain pattern. For example, as... Figure 2 As shown, the battery device 10 may include a plurality of battery cell assemblies 200 arranged along a first direction, for example... Figure 2 Taking the width direction Y of the battery device 10 as an example; further, if the number of battery cells 20 in the battery device 10 is large, the battery device 10 may also include multiple battery cell assemblies 200 arranged along the second direction, for example... Figure 2 Taking the second direction as the length direction X of the battery device 10 as an example.

[0087] It should be understood that the first battery cell assembly 210 in this application embodiment can be any one of the plurality of battery cell assemblies 200. For example, each of the plurality of battery cell assemblies 200 included in the battery device 10 can be the first battery cell assembly 210 in this application embodiment. Figure 2 As shown, the first battery cell assembly 210 may include a plurality of battery cells 20 arranged along a second direction, wherein, Figure 2 Taking the second direction as the length direction X of the battery device 10 as an example.

[0088] It should be understood that the first battery cell assembly 210 in this application embodiment corresponds to the first leakage detection assembly 30 among a plurality of leakage detection assemblies 300, that is, the first leakage detection assembly 30 is located between the first wall 201 of the battery cell 20 of the first battery cell assembly 210 and the first housing wall 113.

[0089] Figure 3 A schematic diagram of the structure of the first battery cell assembly 210 and the corresponding first leakage detection assembly 30 according to an embodiment of this application is shown. Figure 2 and Figure 3 As shown, the battery device 10 of this application may include a plurality of leakage detection components 300, wherein the plurality of leakage detection components 300 correspond one-to-one with a plurality of battery cell assemblies 200, that is, each leakage detection component 300 corresponds to a plurality of battery cells 20 included in a battery cell assembly 200.

[0090] For ease of explanation, this application mainly uses the first leakage detection component 30 as an example for illustration. The first leakage detection component 30 can be any one of a plurality of leakage detection components 300. Figure 2 and Figure 3 As shown, the first leakage detection component 30 corresponds to the first battery cell assembly 210 among the plurality of battery cell assemblies 200, that is, it corresponds to the plurality of battery cells 20 included in the first battery cell assembly 210. The first leakage detection component 30 can be used to detect whether leakage has occurred in the plurality of battery cells 20 included in the first battery cell assembly 210. The battery cell 20 mentioned below mainly refers to the battery cell 20 in the first battery cell assembly 210, corresponding to the first leakage detection component 30, but the relevant description also applies to other battery cells 20 in the battery device 10. For the sake of brevity, it will not be repeated here.

[0091] Figure 4 A schematic diagram of the structure of the battery cell 20 according to an embodiment of this application is shown. Figure 5 An exploded structural diagram of the battery cell 20 according to an embodiment of this application is shown. For example, the... Figure 4 and Figure 5 The battery cell 20 can be such as Figures 2 to 3 Any one of the battery cells 20 shown below, the following text mainly refers to this one. Figure 4 and Figure 5 The battery cell 20 shown is located in the first battery cell assembly 210 as an example.

[0092] The battery cell 20 in this embodiment contains an electrolyte. For example, the battery cell 20 may include a housing 21 for containing the electrolyte.

[0093] like Figure 4 and Figure 5 As shown, the battery cell 20 in this embodiment has a first wall 201, and this first wall 201 faces the first housing wall 113 of the housing 11 along the direction of gravity. This battery cell 20 is at risk of leakage. Since the battery device 10 is equipped with multiple leakage detection components 300, and these multiple leakage detection components 300 correspond one-to-one with multiple battery cell assemblies 200, different leakage detection components 300 detect different battery cell assemblies 200. Therefore, compared to using the same leakage detection component to detect all battery cells 20, the battery device 10 of this application can determine the specific battery cell assembly 200 that is leaking based on the corresponding leakage detection component 300 when leakage occurs in any of the battery cell 200s, thereby improving the accuracy of leakage detection.

[0094] For example, if electrolyte leakage occurs in the battery cell 20 within the first battery cell assembly 210, and the first leakage detection component 30 corresponds to the first battery cell assembly 210 and is located between the first wall 201 of the battery cell 20 and the first housing wall 113 of the first battery cell assembly 210, then the leaked electrolyte will fall to the first leakage detection component 30 below under the action of gravity and be collected by the first leakage detection component 30. This will determine that the battery cell 20 within the first battery cell assembly 210 corresponding to the first leakage detection component 30 has experienced leakage, while excluding leakage of battery cells 20 corresponding to other leakage detection components 300 that have not detected leakage.

[0095] It should be understood that the battery cell 20 in this application embodiment may include one or more locations where leakage may occur. In some embodiments, the location where leakage occurs in the battery cell 20 may be related to the first wall 201.

[0096] For example, the first wall 201 of the battery cell 20 may be provided with an electrode terminal 214. This electrode terminal 214 is typically a separate structure from the first wall 201, meaning they are not usually integrally formed. In this case, electrolyte leakage may occur between the electrode terminal 214 and the first wall 201. For example, the first wall 201 may be provided with an electrode lead-out hole, with at least a portion of the electrode terminal 214 located within the electrode lead-out hole, thus sealing the electrode lead-out hole. However, in cases of seal failure, electrolyte leakage may occur between the electrode terminal 214 and the electrode lead-out hole.

[0097] For example, the first wall 201 may also be provided with a liquid injection structure 216. Specifically, the first wall 201 may be provided with a liquid injection hole through which electrolyte is injected into the interior of the battery cell 20. After the electrolyte injection is completed, the liquid injection hole can be sealed by a sealing member. The liquid injection structure 216 may include the liquid injection hole and a sealing member for sealing the liquid injection hole. Therefore, the liquid injection structure 216 of the first wall 201 may also experience electrolyte leakage. For example, electrolyte may flow out through the gap between the liquid injection hole and the sealing member.

[0098] For example, the first wall 201 may also be provided with a pressure relief mechanism 215, which is used to actuate elements or components to release internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold. The predetermined threshold can be adjusted according to different design requirements. For example, the predetermined threshold may depend on one or more of the materials of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 20.

[0099] The pressure relief mechanism 215 of this application can be separately disposed from the first wall 201. For example, the first wall 201 is provided with a pressure relief hole, and the pressure relief mechanism 215 can be fixed to the first wall 201 by welding to seal the pressure relief hole. Therefore, the pressure relief mechanism 215 of the first wall 201 may also experience electrolyte leakage. For example, in the event of failure of the pressure relief mechanism 215, the electrolyte may flow out through the gap between the pressure relief hole and the pressure relief mechanism 215.

[0100] The term "actuation" as used in this application refers to the pressure relief mechanism 215 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The action of the pressure relief mechanism 215 may include, but is not limited to, at least a portion of the pressure relief mechanism 215 rupturing, breaking, tearing, or opening, etc. When the pressure relief mechanism 215 is actuated, the high-temperature, high-pressure substances inside the battery cell 20 are discharged outwards from the actuated portion as waste. In this way, the battery cell 20 can be depressurized and de-temperatured under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0101] The emissions from the battery cell 20 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0102] It should be understood that when the first wall 201 is provided with at least one of the components of electrode terminal 214, pressure relief mechanism 215 and liquid injection structure 216, electrolyte leakage may occur in the first wall 201. The leakage detection component 300 of this application embodiment can be used to detect electrolyte leakage occurring in any of the above-mentioned components.

[0103] In some embodiments, the first wall 201 may not be provided with the aforementioned components. For example, the battery cell 20 may also include a third wall intersecting the first wall 201, which is provided with at least one of the following components: electrode terminal 214, pressure relief mechanism 215, and liquid injection structure 216. The first wall 201 is disposed toward the first housing wall 113 along the direction of gravity, and the third wall intersects with the first wall 201. If the third wall is provided with at least one of the following components: electrode terminal 214, pressure relief mechanism 215, and liquid injection structure 216, and leakage occurs, the leaked electrolyte can flow to the edge of the first wall 201 under the action of gravity. Therefore, the leakage detection component 300 of this application can also be used to detect electrolyte leakage.

[0104] The battery cell 20 in this embodiment may include: a housing 211, which is a hollow structure with an opening 2111; and a cover plate 212 for covering the opening 2111 of the housing 211, so that the internal electrolyte can be contained within the battery cell 20. For example, Figure 4and Figure 5 As shown, the outer casing 21 of the battery cell 20 in this embodiment may include a housing 211 and a cover plate 212.

[0105] It should be understood that the housing 211 in this embodiment is a component for accommodating the electrode assembly 22. The housing 211 can be a hollow structure with an opening 2111 at one or more ends. For example, if the housing 211 is a hollow structure with an opening 2111 at one end, a cover plate 212 can be provided accordingly; if the housing 211 is a hollow structure with openings 2111 at both opposite ends, two cover plates 212 can be provided, with the two cover plates 212 respectively covering the openings at both ends of the housing 211.

[0106] It should be understood that the battery cell 20 in this application embodiment can be a cylindrical battery cell, a prismatic battery cell, a pouch battery, or a battery cell of other shapes. Among them, the prismatic battery cell can include a prismatic battery cell, a blade-shaped battery cell, or other multi-prismatic battery cells, such as a hexagonal prismatic battery cell or an octagonal prismatic battery cell, and this application embodiment is not limited to these.

[0107] Corresponding to different shapes of battery cells 20, the casing 211 of the battery cell 20 can be of various shapes, such as a cylinder or a polygonal prism. For example, as shown... Figure 4 and Figure 5 As shown, in this embodiment, the description mainly uses a hollow cuboid structure for the housing 211. Additionally, this embodiment mainly uses a hollow structure with an opening 2111 at one end as an example. However, the relevant descriptions in this embodiment are also applicable to battery cells 20 of other shapes; for the sake of brevity, they will not be elaborated upon here.

[0108] It should be understood that the cover plate 212 in this embodiment is used to cover the opening 2111 of the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the cover plate 212 can be adapted to the shape of the housing 211, such as... Figure 4 and Figure 5 As shown, the shell 211 has a cuboid structure, and the cover plate 212 has a rectangular plate structure that is adapted to the shell 211.

[0109] In the embodiments of this application, the first wall 201 can be any wall of the battery cell 20. For example, the first wall 201 can be any wall of the housing 211 of the battery cell 20, or it can be any wall of the cover plate 212. The embodiments of this application are not limited to this.

[0110] In some embodiments, the cover plate 212 is a first wall 201, that is, the cover plate 212 can be used to set at least one of the electrode terminals 214, the pressure relief mechanism 215 and the liquid injection structure 216, so as to improve the integration of the battery cell 20 and facilitate processing.

[0111] It should be understood that when the cover plate 212 is the first wall 201, electrolyte leakage may also occur in the welded area 213 between the cover plate 212 and the housing 211. Specifically, the cover plate 212 and the housing 211 can be fixedly connected by welding. In the event of failure of the welded area 213 between the cover plate 212 and the housing 211, a crack may occur between the housing 211 and the cover plate 212, and electrolyte can leak through the cracked area. Furthermore, the leakage detection component 300 of this embodiment can also be used to detect electrolyte leakage occurring between the cover plate 212 and the housing 211.

[0112] Alternatively, the first wall 201 can also be the wall of the housing 211 adjacent to the cover plate 212. In this case, the edge where the first wall 201 intersects with the cover plate 212 belongs to the welding area 213 between the cover plate 212 and the housing 211. In the event of electrolyte leakage in the welding area 213, the electrolyte flows towards the first wall 201 under the influence of gravity. Therefore, the leakage detection component 300 of this embodiment can also be used to detect electrolyte leakage between the cover plate 212 and the housing 211.

[0113] In this embodiment, the battery cell 20 may further include an electrode assembly 22. For example, the housing 21 may also be used to house the electrode assembly 22. In this battery cell 20, the electrode assembly 22 is the component in which the electrochemical reaction occurs. Depending on actual usage requirements, the electrode assembly 22 within the housing 211 may be one or more. For example, as... Figure 4 and Figure 5 As shown, two electrode assemblies 22 are provided inside the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure. If the electrode assembly 22 is a cuboid structure, the housing 211 can also be a cuboid structure.

[0114] It should be understood that, such as Figure 4 and Figure 5As shown, the electrode assembly 22 in this embodiment may include tabs 222 and an electrode body 221. The tabs 222 of the electrode assembly 22 may include a positive tab 222a and a negative tab 222b. The positive tab 222a may be formed by stacking the portions of the positive electrode sheet 223 that are not coated with positive active material, and the negative tab 222b may be formed by stacking the portions of the negative electrode sheet 224 that are not coated with negative active material. The electrode body 221 may be formed by stacking or winding the positive electrode sheet 223 and the negative electrode sheet 224 together.

[0115] The electrode terminal 214 in this embodiment is used to electrically connect with the electrode assembly 22 inside the battery cell 20 to output the electrical energy of the battery cell 20. The battery cell 20 may include at least two electrode terminals 214, each including at least one positive electrode terminal 214a and at least one negative electrode terminal 214b. The positive electrode terminal 214a is used to electrically connect with the positive electrode tab 222a of the electrode assembly 22, and the negative electrode terminal 214b is used to electrically connect with the negative electrode tab 222b of the electrode assembly 22. The positive electrode terminal 214a and the positive electrode tab 222a can be directly connected or indirectly connected, as can the negative electrode terminal 214b and the negative electrode tab 222b. For example, the positive electrode terminal 214a can be electrically connected to the positive electrode tab 222a through a current collector, and the negative electrode terminal 214b can be electrically connected to the negative electrode tab 222b through a current collector.

[0116] In some embodiments, the plurality of electrode terminals 214 of this application embodiment may be located on the same wall or on different walls. For example, the plurality of electrode terminals 214 included in the battery cell 20 may be located on the same wall, for example, all located on the first wall 201. As another example, the plurality of electrode terminals 214 included in the battery cell 20 may be located on different walls, wherein the first wall 201 is provided with at least one electrode terminal 214, and other walls intersecting or opposite to the first wall 201 are also provided with electrode terminals 214. The embodiments of this application are not limited thereto.

[0117] It should be understood that the battery cell 20 in this embodiment is housed in the housing 11. For example, the battery cell 20 can be fixed to the second housing wall 114 of the housing 11 to achieve the fixation between the battery cell 20 and the housing 11.

[0118] Figure 6 A cross-sectional view of the battery cell 20 and the corresponding first leakage detection component 30 according to an embodiment of this application is shown, the cross-section being perpendicular to the length direction X of the battery device 10. For example... Figure 6As shown, the battery cell 20 is positioned above the first leakage detection component 30 along the direction of gravity. The housing 11, the battery cell 20, and the first leakage detection component 30 can be fixed together in various ways.

[0119] In this embodiment, the first leakage detection component 30 includes a first insulating layer 31 and a sampling terminal 33. The first insulating layer 31 is fixed to the first housing wall 113. The material of the first insulating layer 31 cannot be swollen by the electrolyte. The sampling terminal 33 is located on the side of the first insulating layer 31 away from the first housing wall 113. The sampling terminal 33 is used to detect whether the plurality of battery cells 20 have experienced electrolyte leakage.

[0120] The first insulating layer 31 is fixed to the first housing wall 113, thus fixing the first leakage detection component 30 to the first housing wall 113. For example, the first insulating layer 31 and the first housing wall 113 can be fixed together by adhesive, such as silicone rubber, to facilitate fixation. The sampling terminal 33 of the first leakage detection component 30 is located on the side of the first insulating layer 31 away from the first housing wall 113, that is, on the side of the first insulating layer 31 facing the battery cell 20, so as to detect the electrolyte leakage of the battery cell 20 in a timely manner.

[0121] Considering that the first housing wall 113 of the housing 11 is usually made of metal, if the first insulating layer 31 is not swollen by the electrolyte, and multiple battery cells 20 corresponding to different leakage detection components 300 have electrolyte leakage, then under the insulating effect of the first insulating layer 31 of different leakage detection components 300, multiple leakage points cannot or are difficult to be electrically connected through the first housing wall 113, which can improve the insulation reliability of the battery device 10.

[0122] In some embodiments, each battery cell 20 further includes a second wall 202 opposite to the first wall 201, and the housing 11 further includes a second housing wall 114 opposite to the first housing wall 113. The second wall 202 and the second housing wall 114 are fixed, thereby achieving relative fixation between the battery cell 20 and the housing 11. Further, considering that the first housing wall 113 and the second housing wall 114 are arranged opposite each other along the direction of gravity, the second housing wall 114 in this embodiment can be the top wall of the housing 11, that is, after the battery device 10 is assembled, the second housing wall 114 is located at the top of the battery device 10 along the direction of gravity. For example, as... Figure 2As shown, the second wall 114 can be the top wall of the first housing portion 111 located above. When the first housing portion 111 and the second housing portion 112 of the housing 11 are closed, the first leakage detection assembly 30 fixed to the first housing wall 113 and the battery cell 20 fixed to the second housing wall 114 can be fixed and housed inside the housing 11.

[0123] In some embodiments, a gap exists between the surface of the first wall 201 facing the first leakage detection component 30 and the surface of the first leakage detection component 30 facing the first wall 201. Specifically, when the first housing portion 111 and the second housing portion 112 of the housing 11 are closed, the relative positional relationship between the battery cell 20 and the corresponding first leakage detection component 30 can be as follows: Figure 6 As shown, the gap between the surface of the first wall 201 of the battery cell 20 and the surface of the first leakage detection component 30 can be used to increase the insulation reliability between the battery cell 20 and the first leakage detection component 30, especially the insulation reliability between the battery cell 20 and the terminal 33.

[0124] It should be understood that the size of the gap between the surface of the first wall 201 facing the first leakage detection component 30 and the surface of the first leakage detection component 30 facing the first wall 201 can be set according to the actual application. The gap should not be too small to reduce the possibility of contact between the surface of the first wall 201 and the surface of the first leakage detection component 30; but the gap should not be too large to improve the space utilization within the battery device 10.

[0125] It should be understood that the specific structure of the leakage detection component 300 in this application embodiment can be set according to actual application. The following description will be based on the first leakage detection component 30 as an example, with reference to the accompanying drawings.

[0126] Figures 7 to 9 Several possible cross-sectional schematic diagrams of the first leakage detection component 30 according to embodiments of this application are shown. Figures 7 to 9 The cross-sections shown are all perpendicular to the length direction X of the battery device 10. Figures 7 to 9 The first leakage detection component 30 shown is as follows: Figure 2 , Figure 3 and Figure 6 Several possible configurations of the leakage detection component 300 included in the battery device 10 shown.

[0127] In some embodiments, such as Figure 7As shown, the first leakage detection component 30 includes a first insulating layer 31 and a sampling terminal 33. The sampling terminal 33 is located on the side of the first insulating layer 31 away from the first housing wall 113. The material of the first insulating layer 31 cannot be swollen by the electrolyte. The sampling terminal 33 is used to detect whether the plurality of battery cells 20 have experienced electrolyte leakage.

[0128] In some embodiments, such as Figures 8 to 9 As shown, the first leakage detection component 30 further includes a second insulating layer 32, with the sampling terminal 33 located between the first insulating layer 31 and the second insulating layer 32. The material of the second insulating layer 32 can be swollen by the electrolyte. When no electrolyte leakage occurs in the battery cell 20, the second insulating layer 32 improves the insulation reliability between the sampling terminal 33 and the battery cell 20. In the event of electrolyte leakage, the second insulating layer 32 can swell or even fuse with the electrolyte, allowing the sampling terminal 33 to promptly collect the leaked electrolyte without affecting the first leakage detection component 30's ability to determine whether an electrolyte leak has occurred.

[0129] It should be understood that the first insulating layer 31 and the second insulating layer 32 in the embodiments of this application can be fixed to each other in a variety of ways. For example, the first insulating layer 31 and the second insulating layer 32 can be bonded together by heat fusion or adhesive.

[0130] In this embodiment, the first insulating layer 31 cannot be swollen by the electrolyte, while the second insulating layer 32 can be swollen by the electrolyte. The materials of the first insulating layer 31 and the second insulating layer 32 can be set according to the actual application. For example, the materials of the first insulating layer 31 and the second insulating layer 32 can be selected according to the material of the electrolyte. For example, taking an electrolyte containing ethylene carbonate (EC) and / or dimethyl carbonate (DMC) as an example, the first insulating layer 31 is usually made of a polymer material that is difficult to swell with EC and DMC, such as polypropylene (PP), polyethylene (PE), PP and PE polymers, polyethylene terephthalate (PET), etc.; the second insulating layer 32 is usually made of a polyacrylate polymer material, such as polymethyl methacrylate (PMMA), so that the solvent molecules such as EC and DMC in the electrolyte can quickly swell with the second insulating layer 32, causing the second insulating layer 32 to be dissolved, thereby allowing the leaked electrolyte to penetrate to the sampling terminal 33.

[0131] It should be understood that, such as Figures 7 to 9 As shown, regardless of whether the first leakage detection component 30 is provided with a second insulating layer, the sampling terminal 33 in this embodiment is generally fixed to the underlying first insulating layer 31. For example, the sampling terminal 33 typically includes a metal wire, and the sampling terminal 33 can be fixed to the underlying first insulating layer 31 by adhesive bonding.

[0132] It should be understood that the specific position of the sampling terminal 33 in this application embodiment can be set according to actual application. In some embodiments, such as Figure 7 and Figure 9 As shown, the first insulating layer 31 has a first groove 311 with an opening facing the second insulating layer 32, and at least a portion of the sampling terminal 33 is located in the first groove 311 to reduce the space occupied by the sampling terminal 33.

[0133] In some embodiments, such as Figure 8 As shown, the second insulating layer 32 has a second groove 321 with an opening facing the first insulating layer 31, and at least a portion of the sampling terminal 33 is located in the second groove 321 to reduce the space occupied by the sampling terminal 33.

[0134] In some embodiments, unlike Figures 7 to 9 As shown, when the first insulating layer 31 is provided with the first groove 311, the second insulating layer 32 can also be provided with the second groove 321, so that the sampling terminal 33 occupies the space of the first groove 311 and the second groove 321 at the same time. The embodiments of this application are not limited to this.

[0135] In some embodiments, if the first leakage detection component 30 is provided with a second insulating layer 32, a gap may be provided between the sampling terminal 33 and the surface of the second insulating layer 32 facing the sampling terminal 33, so as to further improve the insulation reliability between the sampling terminal 33 and the upper battery cell 20.

[0136] In this embodiment, the first insulating layer 31 has a third groove 312 with an opening facing the first battery cell assembly 210. In this way, in the event of electrolyte leakage in the battery cell 20, the leaked electrolyte is located in the third groove 312 and cannot further diffuse to the outside of the first leakage detection assembly 30. That is, the third groove 312 can be used to effectively curb the diffusion of leaked electrolyte, reduce the risk of leaked electrolyte corroding the battery cells 20 in other battery cell assemblies 200, and thus reduce the risk of multi-point leakage in the entire battery device 10.

[0137] In some embodiments, the bottom wall of the third groove 312 covers the orthographic projection of the first wall 201 of the plurality of battery cells 20 toward the bottom wall of the third groove 312. That is, the orthographic projection of the first wall 201 of the battery cells 20 of the first battery cell assembly 210 toward the bottom wall of the third groove 312 is all located within the range of the bottom wall of the third groove 312. This allows the leaked electrolyte to fall into the third groove 312 under gravity if electrolyte leakage occurs at any position of the first wall 201 of the battery cell 20, thereby reducing the diffusion of the leaked electrolyte toward the battery cell assembly 200 corresponding to other leakage detection components 300.

[0138] It should be understood that the depth of the third groove 312 in this application embodiment can be set according to actual application. In some embodiments, such as Figure 7 As shown, if the first leakage detection component 30 does not have a second insulating layer 32, on the one hand, the third groove 312 can be used to accommodate the sampling terminal 33, and on the other hand, the depth of the third groove 312 is usually shallow to improve the space utilization rate within the battery device 10.

[0139] In some embodiments, such as Figure 8 and Figure 9 As shown, if the first leakage detection component 30 is provided with a second insulating layer 32, the second insulating layer 32 is located within the third groove 312, and the thickness of the second insulating layer 32 is less than the depth of the third groove 312, that is, the depth of the third groove 312 is relatively large to accommodate the second insulating layer 32. Furthermore, by setting the thickness of the second insulating layer 32 to be less than the depth of the third groove 312, that is, the sidewall of the third groove 312 is higher than the second insulating layer 32, in the event of electrolyte leakage, even if the second insulating layer 32 is not completely swollen, electrolyte overflow into the third groove 312 can be reduced, thereby further reducing the risk of electrolyte diffusion.

[0140] In some embodiments, such as Figure 9 As shown, when the first insulating layer 31 of the first leakage detection assembly 30 is provided with a first groove 311 and a third groove 312, the first groove 311 can be located on the bottom wall of the third groove 312. For example, the first groove 311 can be used to accommodate the sampling terminal 33, while the third groove 312 can be used to accommodate the second insulating layer 32.

[0141] Figure 10 This illustration shows a schematic diagram of the structure of a first leakage detection component 30 according to an embodiment of this application. For example, the... Figure 10 It can be like Figure 2 and Figure 3 One possible implementation of any of the leakage detection components 300 included in the battery device 10 shown.

[0142] In this embodiment, the specific structure of the sampling terminal 33 can be configured according to the actual application. For example, as Figure 10 As shown, the sampling terminal 33 includes a first metal wire 331 and a second metal wire 332 arranged in parallel. The battery device includes a control component 40. The first end 3311 of the first metal wire 331 and the first end 3321 of the second metal wire 332 are connected to the control component 40. The second end 3312 of the first metal wire 331 and the second end 3322 of the second metal wire 332 are disconnected. The control component 40 is used to detect whether there is electrolyte that electrically connects the first metal wire 331 and the second metal wire 332. Thus, when there is no electrolyte leakage in the battery cell 20, the first metal wire 331 and the second metal wire 332 are disconnected; when there is electrolyte leakage in the battery cell 20, the leaked electrolyte can conduct the first metal wire 331 and the second metal wire 332. Since the first end 3311 of the first metal wire 331 and the first end 3321 of the second metal wire 332 are connected to the control component 40, the control component 40 can determine whether electrolyte leakage has occurred based on the on / off state between the first metal wire 331 and the second metal wire 332.

[0143] It should be understood that, such as Figure 10 As shown, the sampling terminal 33 includes two metal wires, each of which may include two ends. The first end 3311 of the first metal wire 331 can be located at any position in the first leakage detection assembly 30, for example... Figure 10 Taking the first end 3311 of the first metal wire 331 as the lower end as an example, the upper end is the second end 3312 of the first metal wire 331. Similarly, the first end 3321 of the second metal wire 332 can also be located at any position in the first leakage detection component 30, for example, Figure 10 Taking the first end 3321 of the second metal wire 332 as the lower end as an example, the upper end is the second end 3322 of the second metal wire 332.

[0144] In this embodiment, the disconnection between the second end 3312 of the first metal wire 331 and the second end 3322 of the second metal wire 332 can be achieved in various ways. For example, the second end 3312 of the first metal wire 331 and the second end 3322 of the second metal wire 332 can be spaced apart, and the disconnection is achieved through the gap between them. Specifically, when the first metal wire 331 and the second metal wire 332 are arranged in parallel, and there is a gap between the second end 3312 of the first metal wire 331 and the second end 3322 of the second metal wire 332, the connection between them can be made disconnected.

[0145] In some embodiments, an insulating structure may be provided between the second end 3312 of the first metal wire 331 and the second end 3322 of the second metal wire 332, or they may be fixed to each other with an insulating structure to further maintain the disconnected state between them. For example, as shown... Figure 10 As shown, the positions of the second end 3312 of the first metal wire 331 and the second end 3322 of the second metal wire 332 can be set not to exceed the edge of the first insulating layer 31. For example, the second end 3312 of the first metal wire 331 and the second end 3322 of the second metal wire 332 can be fixed at different positions near the edge of the first insulating layer 31 so as to maintain the disconnected state between the two through the first insulating layer 31.

[0146] It should be understood that the control component 40 in this embodiment can detect whether electrolyte is present, electrically connecting the first metal wire 331 and the second metal wire 332, thereby determining whether electrolyte leakage exists. In some embodiments, the battery management system (BMS) within the battery device 10 may include the control component 40, i.e., the first end 3311 of the first metal wire 331 and the first end 3321 of the second metal wire 332 are connected to the BMS for detecting whether electrolyte leakage exists.

[0147] The specific configuration of the control component 40 in this embodiment can be configured according to actual applications. Figure 11 This diagram illustrates a possible connection circuit between the sampling terminal 33 and the control component 40 according to an embodiment of this application. Figure 11 As shown, sampling terminal 33 includes two metal wires as an example.

[0148] In some embodiments, the control component 40 includes a first resistor 41 and a second resistor 42. A first end of the first resistor 41 is connected to a power supply 43, and a second end of the first resistor 41 is connected to a first end of the second resistor 42. The second end of the second resistor 42 is grounded. A sampling terminal 33 is connected in series with the first resistor 41 and in parallel with the second resistor 42 via a first end 3311 of a first metal wire 331 and a first end 3321 of a second metal wire 332. The control component 40 is also used to determine whether electrolyte leakage has occurred in any of the multiple battery cells 20 of the first battery cell assembly 210 based on the voltage at the second end of the first resistor 41. Figure 11 As shown, the multiple leakage detection components 300 in the battery device 10 can all be connected to the control component 40, for example, Figure 11 Only the sampling terminals 33 of four of the leakage detection components 300 are shown. Each sampling terminal 33 includes two metal wires, meaning that each leakage detection component 300 can be connected to the control component 40 through the ends of the two metal wires.

[0149] Taking the sampling terminal 33 of the first leakage detection component 30 as an example, the first end 3311 of the first metal wire 331 and the first end 3321 of the second metal wire 332 of the sampling terminal 33 are connected to the control component 40. In this way, when the two metal wires are electrically connected, the voltage at the detection point 44 will change, thereby determining that there is electrolyte leakage in the battery cell 20 corresponding to the first leakage detection component 30.

[0150] Specifically, the control component 40 can be used to: determine that no electrolyte leakage has occurred in the battery cell 20 when the voltage at the second end of the first resistor 41 does not exceed a threshold, that is, when the voltage at the detection point 44 is substantially equal to the threshold; and determine that electrolyte leakage has occurred in the battery cell 20 when the voltage at the second end of the first resistor 41 exceeds a threshold, that is, when the voltage at the detection point 44 is greater than the threshold.

[0151] It should be understood that, such as Figure 11 As shown, in the absence of electrolyte leakage in the battery cell 20, i.e., when the two metal wires of each sampling terminal 33 are disconnected, the voltage at the second end of the first resistor 41 is equal to the threshold, i.e., the voltage at the detection point 44 is equal to the threshold. Therefore, the magnitude of this threshold is related to the resistance values ​​of the first resistor 41 and the second resistor 42.

[0152] In some embodiments, the resistance values ​​of the first resistor 41 and the second resistor 42 are equal, such that the threshold is equal to half the voltage of the power supply 43, for ease of calculation. Specifically, still taking the first leakage detection component 30 as an example, the control component 40 is further configured to: determine that at least one of the battery cells 20 included in the first battery cell assembly 210 has experienced electrolyte leakage when the voltage at the second end of the first resistor 41 is greater than half the voltage of the power supply 43; or, determine that no electrolyte leakage has occurred in the plurality of battery cells 20 included in the first battery cell assembly 210 when the voltage at the second end of the first resistor 41 is equal to half the voltage of the power supply 43.

[0153] In this embodiment of the application, the sampling terminal 33 of the first leakage detection component 30 is used to detect whether electrolyte leakage has occurred in the multiple battery cells 20 included in the corresponding first battery cell assembly 210. Therefore, the sampling terminal 33 should cover the multiple battery cells 20 as much as possible to improve the accuracy and reliability of the detection.

[0154] In some embodiments, the size of the first leakage detection component 30 is typically larger than the size of the first battery cell assembly 210, so that the first leakage detection component 30 can detect each battery cell 20 included in the first battery cell assembly 210. For example, the width of the first leakage detection component 30 is typically greater than or equal to the width of the first battery cell assembly 210, and / or the length of the first leakage detection component 30 is typically greater than or equal to the length of the first battery cell assembly 210, so that the first leakage detection component 30 can detect leakage in each battery cell 20 included in the first battery cell assembly 210, that is, if any battery cell 20 in the first battery cell assembly 210 leaks, the leaked electrolyte can fall within the range of the first leakage detection component 30, thereby improving detection accuracy.

[0155] It should be understood that the specific distribution of the sampling terminals 33 in this embodiment can be set according to actual applications. For example, to facilitate processing, the sampling terminals 33 can be evenly distributed on the surface of the first insulating layer 31 according to a certain pattern to improve detection accuracy. Furthermore, when the sampling terminals 33 include two parallel metal wires, the two metal wires can be arranged in the same way to facilitate processing. The following description, in conjunction with the accompanying drawings, will use the example of two metal wires arranged in the same way.

[0156] Figure 12 This illustration shows a top view of a first leakage detection component 30 according to an embodiment of this application. Figure 12 It is mainly used to illustrate a possible arrangement of the sampling terminals 33 on the surface of the first insulating layer 31.

[0157] Figure 13 A schematic diagram of a repeating segment 333 of the sampling terminal 33 according to an embodiment of this application is shown. For example, the... Figure 13 The repeated segment 333 shown can be Figure 12 The sampling terminal 33 shown may be a portion of any of the metal wires included in the sampling terminal 33. Figure 14 Another top view schematic diagram of the first leakage detection component 30 according to an embodiment of this application is shown. Figure 14 It is mainly used to illustrate another possible arrangement of the sampling terminals 33 on the surface of the first insulating layer 31. Figure 15 A schematic diagram of a repeating segment 333 of the sampling terminal 33 according to an embodiment of this application is shown. For example, the... Figure 15 The repeated segment 333 shown can be Figure 14 The sampling terminal 33 shown may be a portion of any of the metal wires included in the sampling terminal 33.

[0158] In some embodiments, such as Figures 12 to 15As shown, the sampling terminal 33 includes multiple repeating segments 333 arranged along a second direction and connected end-to-end. Each repeating segment 333 includes a connected first segment 3331 and a second segment 3332. Both the first segment 3331 and the second segment 3332 extend along the width direction of the first leakage detection component 30. The first end of the first segment 3331 is the starting end 3333 of each repeating segment 333, and the first end of the second segment 3332 is the ending end 3334 of each repeating segment 333. The second ends 3335 of the first segment 3331 and 3336 of the second segment 3332 are connected. The multiple repeating segments 333 included in the sampling terminal 33 can have the same shape and size, which facilitates processing and allows for the formation of a more uniformly distributed sampling terminal 33 for detecting electrolyte leakage in different areas, thereby improving detection accuracy.

[0159] It should be understood that the specific shape of the repeating segment 333 in the embodiments of this application can be set according to actual applications. For example, as Figure 14 and Figure 15 As shown, the first segment 3331 and the second segment 3332 are both straight segments. The clamp between the first segment 3331 and the second segment 3332 is an acute angle, so that the sampling terminals 33 are approximately distributed in a "Z" shape. This arrangement is simple to process and evenly distributed, which can improve the processing efficiency and detection effect of the first leakage detection component 30.

[0160] For example, unlike Figure 14 and Figure 15 As shown, the first segment 3331 and the second segment 3332 can also be smooth curved segments, but the embodiments of this application are not limited to this.

[0161] In some embodiments, such as Figure 12 and Figure 13 As shown, the first segment 3331 includes a plurality of first portions 3337 that are bent and connected to each other; and / or, the second segment 3332 includes a plurality of second portions 3338 that are bent and connected to each other, to increase the length of the sampling terminal 33, so that each repeating segment 333 can occupy more area of ​​the first insulating layer 31, further increasing the coverage area of ​​the sampling terminal 33 to improve the electrolyte detection accuracy.

[0162] It should be understood that the number, formation, and size of the multiple first parts 3337 can be set according to the actual application, and the number, formation, and size of the multiple second parts 3338 can also be set according to the actual application. Furthermore, the first segment 3331 and the second segment 3332 can have a mutually symmetrical structure so that the sampling terminals 33 are more evenly distributed and easier to process.

[0163] In some embodiments, such as Figure 12 and Figure 13As shown, among the multiple first parts 3337, the first part 3337 connected to the second end 3336 of the second segment 3332 is a straight line segment, and among the multiple second parts 3338, the second part 3338 connected to the second end 3335 of the first segment 3331 is a straight line segment. Specifically, with Figure 13 For example, the first part 3337 on the left side of the first segment 3331 is used to connect with the second segment 3332, and the second part 3338 on the left side of the second segment 3332 is used to connect with the first segment 3331. Thus, the first part 3337 on the left side of the first segment 3331 and the second part 3338 on the left side of the second segment 3332 can be straight lines connecting each other, that is, the first segment 3331 and the second segment 3332 are connected to each other by straight lines.

[0164] Or, different from Figure 12 and Figure 13 In the plurality of first parts 3337, the first part 3337 connected to the second end 3336 of the second segment 3332 is an arc segment, and in the plurality of second parts 3338, the second part 3338 connected to the second end 3335 of the first segment 3331 is an arc segment. Specifically, unlike Figure 13 The first part 3337 on the left side of the first segment 3331 and the second part 3338 on the left side of the second segment 3332 can also be connected by an arc, that is, the first segment 3331 and the second segment 3332 are connected by an arc.

[0165] In some embodiments, such as Figure 12 and Figure 13 As shown, the first segment 3331 includes three first parts 3337, and the second segment 3332 includes three second parts 3338, so that multiple repeating segments 333 can be interconnected by a smaller number of first parts 3337 and second parts 3338. Specifically, the first segment 3331 of any repeating segment 333 can be connected to another repeating segment 333 by one of the three first parts 3337, and connected to the second segment 3332 by the other first part 3337; similarly, the second segment 3332 of any repeating segment 333 can be connected to another repeating segment 333 by one of the three second parts 3338, and connected to the first segment 3331 by the other second part 3338.

[0166] In some embodiments, such as Figure 12 and Figure 13 As shown, all three first parts 3337 are straight line segments, and all three second parts 3338 are straight line segments; adjacent first parts 3337 are perpendicular to each other, and adjacent second parts 3338 are perpendicular to each other. This forms a structure as follows: Figure 12 and Figure 13 The distribution shown is such that the sampling terminals 33 cover as much area as possible.

[0167] Or, different from Figure 12 and Figure 13 The three parts 3337 can also have arc segments. For example, the first part 3337 and the second part 3338 that are connected to each other can be set as an arc segment, while the first part 3337 located between the two first parts 3337 can be a straight segment, and the second part 3338 located between the two second parts 3338 can also be a straight segment. Then the sampling terminal 33 can be distributed in an approximately "S" shape. However, the embodiments of this application are not limited to this.

[0168] In the embodiments of this application, such as Figures 12 to 13 As shown, the sampling terminals 33 of the first leakage detection component 30 may include multiple interconnected complete repeating segments 333, such that the sampling terminals 33 are distributed according to a certain pattern. However, due to the varying sizes of the first leakage detection components 30, in order to allow the sampling terminals 33 to occupy more area, even when the sampling terminals 33 are arranged according to a certain pattern, the sampling terminals 33 may also include at least one relatively incomplete repeating segment 333. For example, as... Figure 14 As shown, in addition to the four complete repeating segments 333 in the middle, the upper and lower ends of the sampling terminal 33 also include relatively incomplete repeating segments 333. The distribution pattern of the incomplete repeating segments 333 is similar to that of the complete repeating segments 333, so that the sampling terminal 33 as a whole still has a "Z" shape, and the sampling terminal 33 can occupy more area along the length direction X.

[0169] In this embodiment, the first leakage detection component 30 corresponds to the first battery cell assembly 210. The specific positions of the plurality of battery cells 20 included in the first battery cell assembly 210 can be related to the distribution of the sampling terminals 33. In some embodiments, a plurality of repeating segments 333 correspond one-to-one with a plurality of battery cells 20, so that the length and distribution of the sampling terminals 33 below the plurality of battery cells 20 are approximately the same, so that if electrolyte leakage occurs in any battery cell 20, it can be detected in a timely manner by the sampling terminals 33 below.

[0170] According to some embodiments of this application, this application also provides an electrical device including the battery device 10 described in any of the above embodiments, and the battery device 10 is used to provide electrical energy to the electrical device.

[0171] The electrical device can be any of the aforementioned devices or systems that utilize battery devices.

[0172] According to some embodiments of this application, see Figures 2 to 15This application provides a battery device 10, including: a housing 11, the housing including a first housing wall 113; a plurality of battery cell assemblies 200 arranged along a first direction, the plurality of battery cell assemblies 200 being housed in the housing 11, wherein a first battery cell assembly 210 of the plurality of battery cell assemblies 200 includes a plurality of battery cells 20 arranged along a second direction, each of the plurality of battery cells 200 containing an electrolyte, each battery cell 20 having a first wall 201 facing the first housing wall 113 along the direction of gravity; a plurality of leakage detection components 300, the plurality of leakage detection components 300 corresponding one-to-one with the plurality of battery cell assemblies 200, wherein a first leakage detection component 30 of the plurality of leakage detection components 300 corresponds to the first battery cell assembly 210, the first leakage detection component is located between the first wall 201 of the plurality of battery cells 20 and the first housing wall 113, and the first leakage detection component 30 is used to detect whether electrolyte leakage has occurred in the plurality of battery cells 20.

[0173] The first leakage detection component 30 includes a first insulating layer 31 and a sampling terminal 33. The first insulating layer 31 is fixed to the first housing wall 113. The material of the first insulating layer 31 cannot be swollen by the electrolyte. The sampling terminal 33 is located on the side of the first insulating layer 31 away from the first housing wall 113. The sampling terminal 33 is used to detect whether electrolyte leakage has occurred in multiple battery cells 20.

[0174] The first leakage detection assembly 30 further includes a second insulating layer 32, and a sampling terminal 33 is located between the first insulating layer 31 and the second insulating layer 32. The material of the second insulating layer 32 is capable of swelling by the electrolyte. The first insulating layer 31 has a first groove 311 with an opening facing the second insulating layer 32, and at least a portion of the sampling terminal 33 is located in the first groove 311; and / or, the second insulating layer 32 has a second groove 321 with an opening facing the first insulating layer 31, and at least a portion of the sampling terminal 33 is located in the second groove 321.

[0175] The first insulating layer 31 has a third groove 312 with an opening facing the first battery cell assembly 210. The bottom wall of the third groove 312 covers the orthographic projection of the first wall 201 of the plurality of battery cells 20 toward the bottom wall of the third groove 312. The second insulating layer 32 is located within the third groove 312, and the thickness of the second insulating layer 32 is less than the depth of the third groove 312.

[0176] The sampling terminal 33 includes a first metal wire 331 and a second metal wire 332 arranged in parallel. The battery device includes a control component 40. The first end 3311 of the first metal wire 331 and the first end 3321 of the second metal wire 332 are connected to the control component 40. The second end 3312 of the first metal wire 331 and the second end 3322 of the second metal wire 332 are disconnected. The control component 40 is used to detect the presence of electrolyte to electrically connect the first metal wire 331 and the second metal wire 332.

[0177] The control component 40 includes a first resistor 41 and a second resistor 42. The first end of the first resistor 41 is connected to the power supply 43, and the second end of the first resistor 41 is connected to the first end of the second resistor 42. The second end of the second resistor 42 is grounded. The sampling terminal 33 is connected in series with the first resistor 41 and in parallel with the second resistor 42 through the first end 3311 of the first metal wire 331 and the first end 3321 of the second metal wire 332. The control component 40 is also used to determine whether electrolyte leakage has occurred in multiple battery cells 20 based on the voltage at the second end of the first resistor 41.

[0178] The sampling terminal 33 includes multiple repeating segments 333 arranged along a second direction and connected end-to-end. Each repeating segment 333 includes a connected first segment 3331 and a second segment 3332. Both the first segment 3331 and the second segment 3332 extend along the width direction of the first leakage detection component 30. The first end of the first segment 3331 is the starting end 3333 of each repeating segment 3333, and the first end of the second segment 3332 is the ending end 3334 of each repeating segment 3333. The second ends 3335 of the first segment 3331 and 3336 of the second segment 3332 are connected. Each of the multiple repeating segments 333 corresponds to one of the multiple battery cells 20.

[0179] The first segment 3331 and the second segment 3332 are both straight line segments, and the clamp between the first segment 3331 and the second segment 3332 is an acute angle.

[0180] The first segment 3331 includes a plurality of mutually bent and connected first parts 3337; and / or, the second segment 3332 includes a plurality of mutually bent and connected second parts 3338. Among the plurality of first parts 3337, the first part 3337 connected to the second end 3336 of the second segment 3332 is a straight segment, and among the plurality of second parts 3338, the second part 3338 connected to the second end 3335 of the first segment 3331 is a straight segment; or, among the plurality of first parts 3337, the first part 3337 connected to the second end 3336 of the second segment 3332 is an arc segment, and among the plurality of second parts 3338, the second part 3338 connected to the second end 3335 of the first segment 3331 is an arc segment.

[0181] The first segment 3331 consists of three first parts 3337, and the second segment 3332 consists of three second parts 3338. All three first parts 3337 are straight line segments, and all three second parts 3338 are straight line segments. Adjacent first parts 3337 are perpendicular to each other, and adjacent second parts 3338 are perpendicular to each other.

[0182] Each battery cell 20 also includes a second wall 202 opposite to the first wall 201, and the housing 11 also includes a second housing wall 114 opposite to the first housing wall 113. The second wall 202 is fixed to the second housing wall 114, and there is a gap between the surface of the first wall 201 facing the first leakage detection component 30 and the surface of the first leakage detection component 30 facing the first wall 201.

[0183] The first wall 201 is provided with at least one of the following components: electrode terminal 214, pressure relief mechanism 215, and liquid injection structure 216. Each battery cell 20 also includes: a housing 211, which is a hollow structure with an opening 2111; and a cover plate 212 for covering the opening 2111 of the housing 211, the cover plate 212 being the first wall 201.

[0184] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The housing (11) includes a first housing wall (113); A plurality of battery cell assemblies (200) arranged along a first direction are housed in the housing (11). A first battery cell assembly (210) of the plurality of battery cell assemblies (200) includes a plurality of battery cells (20) arranged along a second direction. Each of the plurality of battery cells (20) contains an electrolyte. Each battery cell (20) has a first wall (201) that faces the first housing wall (113) along the direction of gravity. Multiple leakage detection components (300) are provided, each corresponding to one of the multiple battery cell assemblies (200). The first leakage detection component (30) of the multiple leakage detection components (300) corresponds to the first battery cell assembly (210). The first leakage detection component (30) is located between the first wall (201) of the multiple battery cells (20) and the first housing wall (113). The first leakage detection component (30) is used to detect whether electrolyte leakage has occurred in the multiple battery cells (20).

2. The battery device according to claim 1, characterized in that, The first leakage detection component (30) includes a first insulating layer (31) and a sampling terminal (33). The first insulating layer (31) is fixed to the first housing wall (113). The material of the first insulating layer (31) cannot be swollen by the electrolyte. The sampling terminal (33) is located on the side of the first insulating layer (31) away from the first housing wall (113). The sampling terminal (33) is used to detect whether electrolyte leakage has occurred in the plurality of battery cells (20).

3. The battery device according to claim 2, characterized in that, The first leakage detection component (30) further includes a second insulating layer (32), and the sampling terminal (33) is located between the first insulating layer (31) and the second insulating layer (32). The material of the second insulating layer (32) can be swollen by the electrolyte.

4. The battery device according to claim 3, characterized in that, The first insulating layer (31) has a first groove (311) opening toward the second insulating layer (32), and at least a portion of the sampling terminal (33) is located in the first groove (311); and / or, The second insulating layer (32) has a second groove (321) with an opening facing the first insulating layer (31), and at least a portion of the sampling terminal (33) is located in the second groove (321).

5. The battery device according to claim 3 or 4, characterized in that, The first insulating layer (31) has a third groove (312) with an opening facing the first battery cell assembly (210), the bottom wall of the third groove (312) covering the orthographic projection of the first wall (201) of the plurality of battery cells (20) toward the bottom wall of the third groove (312).

6. The battery device according to claim 5, characterized in that, The second insulating layer (32) is located within the third groove (312), and the thickness of the second insulating layer (32) is less than the depth of the third groove (312).

7. The battery device according to any one of claims 2 to 6, characterized in that, The sampling terminal (33) includes a first metal wire (331) and a second metal wire (332) arranged in parallel. The battery device includes a control component (40), wherein a first end (3311) of the first metal wire (331) and a first end (3321) of the second metal wire (332) are connected to the control component (40), and a second end (3312) of the first metal wire (331) and a second end (3322) of the second metal wire (332) are disconnected. The control component (40) is used to detect whether there is electrolyte that electrically connects the first metal wire (331) and the second metal wire (332).

8. The battery device according to claim 7, characterized in that, The control component (40) includes a first resistor (41) and a second resistor (42). The first end of the first resistor (41) is connected to the power supply (43), the second end of the first resistor (41) is connected to the first end of the second resistor (42), and the second end of the second resistor (42) is grounded. The sampling terminal (33) is connected in series with the first resistor (41) and in parallel with the second resistor (42) through the first end (3311) of the first metal wire (331) and the first end (3321) of the second metal wire (332). The control component (40) is also used to determine whether electrolyte leakage has occurred in the plurality of battery cells (20) based on the voltage at the second end of the first resistor (41).

9. The battery device according to claim 8, characterized in that, The resistance values ​​of the first resistor (41) and the second resistor (42) are equal; The control component (40) is further configured to: If the voltage at the second terminal of the first resistor (41) is greater than half the voltage of the power supply (43), it is determined that electrolyte leakage has occurred in the plurality of battery cells (20), or... If the voltage at the second end of the first resistor (41) is equal to half the voltage of the power supply (43), it is determined that no electrolyte leakage has occurred in the plurality of battery cells (20).

10. The battery device according to any one of claims 2 to 9, characterized in that, The sampling terminal (33) includes a plurality of repeating segments (333) arranged along the second direction and connected end to end. Each repeating segment (333) includes a first segment (3331) and a second segment (3332) connected together. The first segment (3331) and the second segment (3332) both extend along the width direction of the first leakage detection component (30). The first end of the first segment (3331) is the starting end (3333) of each repeating segment (3333), and the first end of the second segment (3332) is the ending end (3334) of each repeating segment (3333). The second end (3335) of the first segment (3331) and the second end (3336) of the second segment (3332) are connected.

11. The battery device according to claim 10, characterized in that, The first segment (3331) and the second segment (3332) are both straight segments, and the clamp between the first segment (3331) and the second segment (3332) is an acute angle.

12. The battery device according to claim 10, characterized in that, The first segment (3331) comprises a plurality of mutually bent and connected first parts (3337); and / or, The second segment (3332) includes multiple second parts (3338) that are bent and connected to each other.

13. The battery device according to claim 12, characterized in that, Of the plurality of first portions (3337), the first portion (3337) connected to the second end (3336) of the second segment (3332) is a straight line segment, and of the plurality of second portions (3338), the second portion (3338) connected to the second end (3335) of the first segment (3331) is a straight line segment; or, The first part (3337) that connects to the second end (3336) of the second segment (3332) is an arc segment, and the second part (3338) that connects to the second end (3335) of the first segment (3331) is an arc segment.

14. The battery device according to claim 13, characterized in that, The first segment (3331) comprises three first parts (3337), and the second segment (3332) comprises three second parts (3338).

15. The battery device according to claim 14, characterized in that, The three first parts (3337) are all straight line segments, and the three second parts (3338) are all straight line segments. Of the three first parts (3337), any two adjacent first parts (3337) are perpendicular to each other. The two adjacent second parts (3338) of the three second parts (3338) are perpendicular to each other.

16. The battery device according to any one of claims 10 to 15, characterized in that, Each of the multiple repeating segments (333) corresponds one-to-one with each of the multiple battery cells (20).

17. The battery device according to any one of claims 1 to 16, characterized in that, Each battery cell (20) further includes a second wall (202) opposite to the first wall (201), and the housing (11) further includes a second housing wall (114) opposite to the first housing wall (113), wherein the second wall (202) is fixed to the second housing wall (114). There is a gap between the surface of the first wall (201) facing the first leakage detection component (30) and the surface of the first leakage detection component (30) facing the first wall (201).

18. The battery device according to any one of claims 1 to 17, characterized in that, The first wall (201) is provided with at least one of the following components: electrode terminal (214), pressure relief mechanism (215), and liquid injection structure (216).

19. The battery device according to any one of claims 1 to 18, characterized in that, Each battery cell (20) also includes: The housing (211) is a hollow structure with an opening (2111); A cover plate (212) is used to cover the opening (2111) of the housing (211), the cover plate (212) being the first wall (201).

20. An electrical appliance, characterized in that, The battery device includes any one of claims 1 to 19, the battery device being used to supply power to the electrical device.

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