Battery device, battery cell, and electric device

Abstract

The embodiment of the application discloses a battery device, a battery monomer and an electric equipment, and relates to the battery field. The battery device comprises a plurality of battery monomers, a voltage collection part and a temperature collection part. Each battery monomer in the plurality of battery monomers comprises a shell and an electrode assembly. The electrode assembly is accommodated in the shell. The shell comprises an end cover. The end cover comprises an electrode terminal and a protruding part. The protruding part protrudes towards a side of the end cover away from the electrode assembly. The protruding part is arranged in a spaced manner with the electrode terminal. The voltage collection part is electrically connected with the protruding part. The protruding part is electrically connected with the electrode terminal. The voltage collection part is used to acquire the voltage of the protruding part of each battery monomer in at least two battery monomers in the plurality of battery monomers. In addition, the voltage collection part is used to acquire the voltage of at least two protruding parts on each battery monomer in the plurality of battery monomers. The temperature collection part is arranged on the surface of the protruding part. The structure can improve the state sensing speed and accuracy of the battery monomer.

Description

Technical Field

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

[0002] As the core component of energy storage and power equipment, the temperature and voltage parameters of a battery cell directly affect its operational stability, safety, and lifespan. Currently, data acquisition components are typically designed into the busbar to collect relevant parameters of the battery cells. However, this method is susceptible to factors such as installation process, electromagnetic interference, and contact impedance, resulting in poor accuracy of the acquired data. Utility Model Content

[0003] This application provides a battery device, a battery cell, and an electrical device that can improve the speed and accuracy of battery cell status sensing.

[0004] In a first aspect, this application provides a battery device, comprising: a plurality of battery cells, each of the plurality of battery cells including a housing and an electrode assembly, the electrode assembly being housed in the housing, the housing including an end cap, the end cap including an electrode terminal and a protrusion, the protrusion protruding toward the side of the end cap away from the electrode assembly, the protrusion and the electrode terminal being spaced apart; a voltage acquisition element electrically connected to the protrusion, the protrusion being electrically connected to the electrode terminal, the voltage acquisition element being used to acquire the voltage of the protrusion of at least two of the plurality of battery cells, and / or, the voltage acquisition element being used to acquire the voltage of at least two protrusions on each of the plurality of battery cells; and a temperature acquisition element disposed on the surface of the protrusion.

[0005] In the technical solution of this application embodiment, by providing a protrusion spaced from the electrode terminals on the end cap of the battery cell, and placing the temperature acquisition device on the surface of the protrusion and electrically connecting the voltage acquisition device to the protrusion, the signal interference from other structures during the acquisition process of the temperature and voltage acquisition devices can be reduced, the transmission path of temperature and voltage signals can be shortened, the acquisition of battery cell voltage and temperature can be realized, the sensing speed and detection accuracy of battery cell working status can be improved, and the monitoring of battery cells can be achieved more timely and accurate.

[0006] In some embodiments of the first aspect, a plurality of battery cells include a first battery cell and a second battery cell connected in series. The first battery cell includes a first protrusion and a first electrode terminal, and the second battery cell includes a second protrusion and a second electrode terminal. The first protrusion is electrically connected to the first electrode terminal, and a fourth protrusion is electrically connected to the second electrode terminal. The first electrode terminal and the second electrode terminal have the same polarity. Two voltage acquisition devices are respectively electrically connected to the first protrusion and the second protrusion to obtain the voltage between the first protrusion and the second protrusion.

[0007] In the technical solution of this application embodiment, a first protrusion and a first electrode terminal are provided on the first battery cell, and a second protrusion and a second electrode terminal are provided on the second battery cell. The first electrode terminal and the second electrode terminal have the same polarity. The voltage of the first battery cell or the second battery cell is obtained by electrically connecting the two protrusions with a voltage acquisition device. The protrusion is used as a voltage lead-out terminal, which reduces assembly interference between the acquisition device and the electrode terminal, improves the stability of electrical connection and signal acquisition, reduces voltage transmission loss, and improves the accuracy and reliability of voltage acquisition.

[0008] In some embodiments of the first aspect, each of the plurality of battery cells has electrode terminals including a third electrode terminal and a fourth electrode terminal with opposite polarities, and each of the plurality of battery cells has a protrusion including a third protrusion and a fourth protrusion, the third protrusion being electrically connected to the third electrode terminal and the fourth protrusion being electrically connected to the fourth electrode terminal; wherein, two voltage acquisition devices are respectively electrically connected to the third protrusion and the fourth protrusion to obtain the voltage between the third protrusion and the fourth protrusion.

[0009] In the technical solution of this application embodiment, by setting matching third and fourth protrusions on the end cap corresponding to the positive and negative electrode terminals, and utilizing the equipotential characteristics of the protrusions and the electrode terminals, the voltage acquisition device can directly detect the potential of the two protrusions to obtain the voltage of the battery cell, which simplifies the battery cell structure, reduces assembly complexity, and improves the stability and reliability of voltage detection.

[0010] In some embodiments of the first aspect, the third protrusion is electrically connected to the third electrode terminal via a conductive element; and / or the fourth protrusion is electrically connected to the fourth electrode terminal via a conductive element.

[0011] In the technical solution of this application embodiment, by electrically connecting the third protrusion to the third electrode terminal and the fourth protrusion to the fourth electrode terminal through conductive parts, the current can be stably transmitted between the corresponding structures, reducing contact resistance and improving the accuracy of voltage acquisition.

[0012] In some embodiments of the first aspect, the temperature acquisition element includes a thermistor disposed on the surface of the protrusion and connected to the protrusion by means of adhesive bonding or welding.

[0013] In the technical solution of this application embodiment, a thermistor is used as a temperature acquisition device and is directly set on the surface of the protrusion. By utilizing the fast response and high accuracy of the thermistor, combined with the thermal conductivity of the protrusion, the temperature of the battery cell can be quickly acquired. Furthermore, the thermistor is far away from the electrode terminals to avoid interference, and the external setting does not damage the battery seal, thus taking into account the reliability of temperature measurement, structural safety and ease of assembly.

[0014] In some embodiments of the first aspect, the thermistor is connected to the protrusion via silicone or epoxy thermally conductive adhesive; or the thermistor is connected to the protrusion via laser welding.

[0015] In the technical solution of this application embodiment, the thermistor is connected to the protrusion by bonding with silicone or epoxy thermally conductive adhesive or by laser welding. Both methods can achieve bonding and fixation between the two, eliminate contact thermal resistance, improve heat conduction efficiency, maintain the accuracy of temperature acquisition and the continuity of monitoring, and the connection process is highly adaptable and easy to operate, which can take into account both temperature measurement reliability and production assembly convenience.

[0016] In some embodiments of the first aspect, the surface of the thermistor furthest from the protrusion is covered with an insulating layer.

[0017] In the technical solution of this application embodiment, the surface of the thermistor away from the protrusion is covered with an insulating layer, which can realize electrical isolation between the thermistor and the metal surface of the protrusion, avoid short circuits and electrical signal interference, and at the same time protect the electrode assembly, thereby improving the working stability and service life of the thermistor.

[0018] In some embodiments of the first aspect, the battery cell includes a plurality of protrusions spaced apart on the end cap for collecting temperature at different locations of the battery cell.

[0019] In the technical solution of this application embodiment, by setting multiple protrusions at intervals on the end cap to collect the temperature at different locations of the battery cell, multi-point monitoring of the internal temperature of the battery cell can be realized. This can comprehensively reflect the actual heating state and temperature field distribution of the battery cell, and timely capture abnormal situations such as local overheating and uneven temperature, thereby improving the comprehensiveness of temperature monitoring and the accuracy of early warning.

[0020] In some embodiments of the first aspect, the protrusion and the end cap are integrally formed by stamping.

[0021] In the technical solution of this application embodiment, the protrusion and the end cap are integrally formed by stamping, eliminating the need for separate processing and secondary assembly of the protrusion, simplifying the end cap manufacturing process, improving production efficiency and reducing costs; the one-piece structure has no connecting gaps, which not only enhances the overall structural strength and vibration and impact resistance of the end cap, but also eliminates the sealing hazards caused by assembly gaps, ensuring the sealing reliability of the battery cell and preventing electrolyte leakage; at the same time, it reduces the thermal resistance of heat conduction contact, allowing the heat inside the battery cell to be quickly and evenly conducted to the protrusion, improving the response speed and accuracy of temperature acquisition.

[0022] In some embodiments of the first aspect, the battery device further includes a flexible printed circuit board, wherein the projection of the flexible printed circuit board toward the end cover and the projection of the protrusion toward the end cover are spaced apart, and a voltage acquisition element and / or a temperature acquisition element are electrically connected to the flexible printed circuit board, the flexible printed circuit board being used to transmit the voltage signal acquired by the voltage acquisition element and / or the temperature signal acquired by the temperature acquisition element.

[0023] In the technical solution of this application embodiment, by setting the flexible printed circuit board and the projection of the protrusion on the end cover at intervals, assembly interference can be avoided without increasing the overall height of the battery cell; by electrically connecting the voltage acquisition device and / or temperature acquisition device through the flexible printed circuit board to transmit voltage and / or temperature signals, the wiring structure can be simplified, the signal transmission stability and integration can be improved, the signal transmission interference and attenuation can be reduced, and the reliability and accuracy of battery cell status monitoring can be improved.

[0024] Secondly, this application provides a battery cell, comprising: a housing, the housing including an end cap, the end cap including electrode terminals, the electrode terminals including a third electrode terminal and a fourth electrode terminal with opposite polarities; an electrode assembly located within the housing; wherein the end cap includes a protrusion, the protrusion protruding toward the side of the end cap away from the electrode assembly, the protrusion being spaced apart from the electrode terminals, the protrusion including a third protrusion and a fourth protrusion, the third protrusion being electrically connected to the third electrode terminal, and the fourth protrusion being electrically connected to the fourth electrode terminal; the third protrusion and the fourth protrusion are used to form an electrical connection with a voltage acquisition device.

[0025] In some embodiments of the second aspect, the third protrusion is electrically connected to the third electrode terminal via a conductive element; and / or the fourth protrusion is electrically connected to the fourth electrode terminal via a conductive element.

[0026] Thirdly, this application provides an electrical device, including: the battery device of the first aspect; or the battery cell of the second aspect.

[0027] In some embodiments, the electrical equipment is a vehicle, a ship, or a spacecraft. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the vehicle structure according to an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the battery device according to an embodiment of this application;

[0030] Figure 3 This is a structural diagram of a battery cell according to an embodiment of this application;

[0031] Figure 4 This is an exploded view of a single battery cell according to an embodiment of this application;

[0032] Figure 5 This is another structural diagram of the battery device according to an embodiment of this application;

[0033] Figure 6 This is another structural diagram of a battery cell according to an embodiment of this application;

[0034] Figure 7 This is another structural diagram of the battery device according to an embodiment of this application;

[0035] Figure 8 This is another structural diagram of a battery cell according to an embodiment of this application;

[0036] Figure 9 This is another structural diagram of a battery cell according to an embodiment of this application;

[0037] Figure 10 This is another structural diagram of the battery device according to an embodiment of this application.

[0038] The accompanying drawings are not drawn to scale.

[0039] Figure label:

[0040] 1000 - Vehicle; 100 - Battery assembly; 10 - Housing; 101 - First housing section; 102 - Second housing section; 20 - Battery cell; 201 - First battery cell; 202 - Second battery cell; 21 - Housing; 211 - Opening; 212 - Housing; 22 - End cap; 23 - Electrode terminal; 231 - Third electrode terminal; 232 - Fourth electrode terminal; 24 - Pressure relief mechanism; 25 - Electrode assembly; 251 - Tab; 26 - Protrusion; 263 - First protrusion; 264 - Second protrusion; 261 - Third protrusion; 262 - Fourth protrusion; 30 - Flexible printed circuit board; 40 - Voltage acquisition device; 50 - Temperature acquisition device; 200 - Motor; 300 - Controller. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0048] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0049] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0050] 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.

[0051] 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.

[0052] 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 negative and positive 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, reduces the occurrence of short circuits while allowing active ions to pass through.

[0053] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0054] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0055] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0056] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0057] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0058] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0059] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0060] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0061] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0062] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells.

[0063] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0064] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0065] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0066] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0067] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0068] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0069] Liquid electrolytes include electrolyte salts and solvents.

[0070] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0071] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0072] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0073] In some implementations, the electrode assembly is a stacked structure.

[0074] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0075] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0076] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0077] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0078] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0079] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0080] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0081] 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.

[0082] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0083] 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 have one or more.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0088] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0089] 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.

[0090] 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.

[0091] The battery apparatus 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 connected in series, parallel, or mixed connections via a busbar.

[0092] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0093] 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.

[0094] In some embodiments, the battery device may be a battery pack, which includes a battery housing and one or more individual battery cells housed within the battery housing.

[0095] As an example, a battery cell assembly can be a battery module, which can be housed in a battery housing by fixing the battery module in the battery housing.

[0096] As an example, battery cell assemblies can also be housed in a battery housing by directly fixing multiple battery cells to the battery housing.

[0097] As an example, the battery housing may include a first battery housing and a second battery housing portion. The first battery housing portion and the second battery housing portion are fastened together to form a closed space inside the battery housing for housing individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first battery housing may be a top cover or a bottom plate.

[0098] As an example, the battery enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are respectively connected to the frame, so that the interior of the battery enclosure forms an enclosed space to house individual battery cells.

[0099] In some embodiments, the battery housing may be part of the vehicle's chassis structure. For example, a portion of the battery housing may be at least a part of the vehicle's floor, or a portion of the battery housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0100] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0101] As the core component of energy storage and power equipment, the temperature and voltage parameters of a battery cell directly affect its operational stability, safety, and lifespan. Currently, data acquisition components are typically designed into the busbar to collect relevant parameters of the battery cells. However, this method is susceptible to factors such as installation process, electromagnetic interference, and contact impedance, resulting in poor accuracy of the acquired data.

[0102] Based on the above considerations, this application provides a battery device comprising a plurality of battery cells, a voltage acquisition unit, and a temperature acquisition unit. Each of the plurality of battery cells includes a housing, the housing including an end cap and an electrode assembly, the electrode assembly being housed within the housing. The end cap includes electrode terminals and a protrusion, the protrusion protruding toward the side of the end cap away from the electrode assembly, and the protrusion and the electrode terminals being spaced apart. The voltage acquisition unit is electrically connected to the protrusion, and the protrusion is electrically connected to the electrode terminals. The voltage acquisition unit is used to acquire the voltage of the protrusion of at least two of the plurality of battery cells, and / or, the voltage acquisition unit is used to acquire the voltage of at least two protrusions on each of the plurality of battery cells. The temperature acquisition unit is disposed on the surface of the protrusion.

[0103] In the embodiments of this application, by providing a protrusion spaced from the electrode terminals on the end cap of the battery cell, and placing the temperature acquisition device on the surface of the protrusion and electrically connecting the voltage acquisition device to the protrusion, the signal interference from other structures during the acquisition process of the temperature and voltage acquisition devices can be reduced, the transmission path of temperature and voltage signals can be shortened, the sensing speed and detection accuracy of the working status of the battery cell can be improved, and more timely and accurate monitoring of the battery cell can be achieved.

[0104] The technical solutions described in this application are applicable to various electrical devices that use battery devices. These electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0105] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0106] For example, Figure 1 This is a structural schematic diagram of the vehicle according to an embodiment of this application. Figure 1 As shown, vehicle 1000 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 battery device 100, a motor 200, and a controller 300 can be installed inside vehicle 1000. The controller 300 controls the power supply from the battery device 100 to the motor 200. For example, the battery device 100 can be installed at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000's electrical system, such as for the power requirements of starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for vehicle 1000 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving force for vehicle 1000.

[0107] Figure 2 This is a schematic diagram of the battery device according to an embodiment of this application. Figure 2 As shown, the battery device 100 of this application embodiment may include a plurality of battery cells 20 to meet different power usage needs. It should be understood that, as Figure 2 As shown, the battery device 100 in this embodiment may further include a housing 10.

[0108] The housing 10 may include two parts, referred to herein as a first housing part 101 and a second housing part 102, which are fastened together. The shapes of the first housing part 101 and the second housing part 102 can be determined according to the shape of the components housed inside, for example, according to the shape of the combination of multiple battery cells 20 housed inside. At least one of the first housing part 101 and the second housing part 102 has an opening. For example, the first housing part 101 and the second housing part 102 can both be hollow cuboids with one face as an opening. The openings of the first housing part 101 and the second housing part 102 are arranged opposite to each other, and the first housing part 101 and the second housing part 102 are fastened together to form a housing 10 with a closed cavity, which can be used to house multiple battery cells 20. Multiple battery cells 20 are connected in parallel, series, or mixed and placed inside the housing 10 formed by the fastening of the first housing part 101 and the second housing part 102.

[0109] For example, one of the first housing portion 101 and the second housing portion 102 may be a hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the second housing portion 102 as a hollow cuboid with one opening, and the first housing portion 101 as a plate-shaped example, then the first housing portion 101 covers the opening of the second housing portion 102 to form a housing 10 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0110] Figure 3 This is a structural diagram of a battery cell according to an embodiment of this application. Figure 4 This is an exploded view of a single battery cell according to an embodiment of this application. Figure 3 , Figure 4 As shown, the battery cell 20 in this embodiment may include a housing 212, electrode terminals 23, a pressure relief mechanism 24, and an electrode assembly 25.

[0111] The housing 212 includes an outer shell 21 and an end cap 22. The outer shell 21 is a hollow structure with an opening 211. The electrode assembly 25 is housed in the outer shell 21. The shape of the outer shell 21 can be determined according to the specific shape of the electrode assembly 25. For example, if the electrode assembly 25 is a cuboid structure, the outer shell 21 can also be a cuboid structure. Figure 3 and Figure 4 An exemplary case is shown where the housing 21 and electrode assembly 25 are square.

[0112] The outer shell 21 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc. This application embodiment does not limit this.

[0113] End cap 22 is used to seal opening 211 to form a sealed mounting space for accommodating electrode assembly 25. The mounting space is also used to accommodate electrolyte, such as electrolyte solution. Electrode terminals 23 are mounted on end cap 22 for connection to electrode assembly 25, i.e., electrode terminals 23 are connected to tabs 251 of electrode assembly 25.

[0114] The end cap 22 is also equipped with a pressure relief mechanism 24. When the internal pressure of the battery cell 20 rises abnormally, the pressure relief mechanism 24 can be activated in time to release the excessive pressure inside the battery cell 20, thereby reducing the possibility of dangerous situations such as the battery cell 20 exploding.

[0115] It should be understood that the shape of the battery cell 20 in this application embodiment can be flexibly set according to actual application, that is, the outer shell 21 of the battery cell 20 can be any polyhedral structure, for example, it can be set as a cuboid or a cylinder, etc.

[0116] Figure 5 This is another structural diagram of the battery device according to an embodiment of this application. Figure 6 This is another structural diagram of a battery cell according to an embodiment of this application. Figure 5 and Figure 6 As shown, the battery device 100 includes a plurality of battery cells 20, a voltage acquisition unit 40, and a temperature acquisition unit 50. Each of the plurality of battery cells 20 includes a housing 212 and an electrode assembly 25. The electrode assembly 25 is housed in the housing 212. The housing 212 includes an end cap 22. The end cap 22 includes an electrode terminal 23 and a protrusion 26. The protrusion 26 protrudes toward the side of the end cap 22 away from the electrode assembly 25. The protrusion 26 and the electrode terminal 23 are spaced apart. The voltage acquisition unit 40 is electrically connected to the protrusion 26. The protrusion 26 is electrically connected to the electrode terminal 23. The voltage acquisition unit 40 is used to acquire the voltage of the protrusion 26 of at least two of the plurality of battery cells 20, and / or, the voltage acquisition unit 40 is used to acquire the voltage of at least two protrusions 26 on each of the plurality of battery cells 20. The temperature acquisition unit 50 is disposed on the surface of the protrusion 26.

[0117] The housing 212 is a packaging and support component for the battery cell 20. It is used to encapsulate the electrode assembly 25 inside it, and plays a role in protecting the electrode assembly 25, isolating it from the external environment (such as moisture and dust), preventing damage to the electrode assembly 25 and leakage of electrical energy.

[0118] The electrode assembly 25 is located inside the housing 212 and is encapsulated in the sealed space formed by the housing 212 and the end cap 22. The electrode assembly 25 typically includes a positive electrode, a negative electrode, and a diaphragm spaced between the positive electrode and the negative electrode. It may also contain an electrolyte as needed. Its function is to realize the storage and conversion of electrical energy. An electrical connection is established between the electrode assembly 25 and the end cap 22, so that electrical energy can be transferred from the electrode assembly 25 to the end cap 22.

[0119] The housing 212 includes an end cap 22, which is adapted to the overall structure of the housing 212 to achieve sealing inside the housing 212. At the same time, the end cap 22 itself has conductive properties, providing a carrier for electrical energy transmission.

[0120] An electrode terminal 23 is integrated on the end cap 22. The electrode terminal 23 is made of conductive material and is fixedly installed in a preset position on the end cap 22. One end extends to the side of the end cap 22 near the electrode assembly 25 for establishing an electrical connection with the electrode assembly 25 inside the housing 212. The other end extends to the side of the end cap 22 away from the electrode assembly 25 for establishing an electrical connection with external circuits and equipment, so as to realize the input and output of electrical energy between the battery cell 20 and the outside.

[0121] The end cap 22 is provided with a protrusion 26, which is part of the end cap 22 and protrudes outward from the side of the end cap 22 away from the electrode assembly 25, i.e., the outer side of the end cap 22.

[0122] In some embodiments, the protrusion 26 and the end cap 22 can be integrally formed (e.g., manufactured by stamping, injection molding, etc.) or can be a separate structure and fixed to the end cap 22 by a stable connection. The protrusion 26 can provide a stable electrical connection carrier for the electrode terminal 23 and optimize the power transmission path.

[0123] The protrusion 26 and the electrode terminal 23 are spaced apart, meaning that the orthographic projection of the protrusion 26 toward the end cover 22 is spaced apart from the orthographic projection of the electrode terminal 23 toward the end cover 22. Specifically, the projection area formed by projecting the protrusion 26 along a direction perpendicular to the surface of the end cover 22 onto the plane of the end cover 22 is separate from, does not overlap with, and does not intersect with, maintaining a certain gap. This spacing avoids structural interference between the protrusion 26 and the electrode terminal 23 in the projection direction, prevents stress concentration caused by excessive contact between the two, and improves the stability of their electrical connection, avoiding problems such as poor contact caused by structural overlap.

[0124] In some embodiments, adjacent battery cells 20 are electrically connected via a busbar component. The connection end of the busbar component is directly electrically connected to the electrode terminal 23, thus aggregating the current from the multiple battery cells 20. In some embodiments, each battery cell 20 is equipped with a voltage acquisition component 40, which is used to acquire the voltage signal of the battery cell 20. The voltage acquisition component 40 is electrically connected to the protrusion 26 and establishes an electrical connection with the electrode terminal 23 through the protrusion 26, thereby enabling the acquisition of the voltage signal of the electrode terminal 23 through the protrusion 26. The protrusion 26 is connected to the electrode terminal 23 through an internal conductive structure or an external conductive component, replacing the method of directly drawing power from the busbar component. This effectively reduces problems such as assembly interference, poor contact, and poor connection reliability caused by direct connection between the voltage acquisition component 40 and the busbar component. At the same time, it reduces the interference of the busbar component's own current, heat generation, and electromagnetic effects on the voltage acquisition signal, improves the accuracy and stability of voltage acquisition, and thus enhances the overall reliability of the battery device 100 monitoring.

[0125] An electrical connection is established between the protrusion 26 and the electrode terminal 23. Specifically, a low-resistance connection method can be used to enable electrical energy to be smoothly and with low loss transmitted from the end cover 22 through the protrusion 26 to the electrode terminal 23.

[0126] A low-resistance connection refers to an electrical connection in a circuit between two or more conductive components, formed through specific processes, with the lowest possible resistance. Its purpose is to reduce energy loss at the connection interface, enabling efficient and stable current transmission.

[0127] By electrically connecting the protrusion 26 to the electrode terminal 23, the potentials of the two are kept consistent, eliminating the potential difference at the connection interface. This allows the acquisition signal drawn from the protrusion 26 to reflect the actual voltage of the electrode terminal 23, thereby enabling the monitoring and acquisition of the electrode voltage.

[0128] In some embodiments, the battery cell 20 is provided with a temperature acquisition element 50, which is directly disposed on the surface of the protrusion 26 and is in contact with the surface of the protrusion 26. The internal temperature of the battery cell 20 is indirectly acquired by acquiring the temperature of the protrusion 26.

[0129] The protrusion 26 conducts heat from inside the battery cell 20 to its surface. The temperature sensor 50 is fitted against this surface and can sense the temperature of the protrusion 26, thus reflecting the actual heating state of the battery cell 20. This arrangement eliminates the need for the temperature sensor 50 to extend into the battery cell 20, avoiding the risks of short circuits and corrosion caused by contact between the sensor and the electrolyte or electrode assembly 25. It also simplifies the assembly and fixing process of the temperature sensor 50, reducing installation difficulty. Compared to existing technologies that connect the temperature sensor 50 to the busbar, placing the temperature sensor 50 on the protrusion 26 shortens the heat conduction path. The temperature difference between the protrusion 26 and the internal temperature of the battery cell 20 is smaller than the temperature difference between the busbar and the internal temperature of the battery cell 20, thereby improving the accuracy of the temperature sensor 50.

[0130] After the temperature acquisition device 50 is attached to the surface of the protrusion 26, its sensing end contacts the protrusion 26 and can detect the temperature of the protrusion 26 in real time. The protrusion 26 can transmit the temperature change inside the battery cell 20. Therefore, by acquiring the temperature of the protrusion 26, the temperature acquisition device 50 can acquire the actual temperature of the battery cell 20.

[0131] The wiring terminals of the temperature acquisition component 50 are arranged on the side away from the electrode terminals 23, which facilitates electrical connection with external signal transmission components such as flexible printed circuit boards, so as to realize stable transmission of temperature acquisition signals. Moreover, the entire assembly process does not require additional opening or processing of the housing 212 of the battery cell 20, ensuring the sealing integrity of the battery cell 20 and not affecting its overall structural strength and safety of use.

[0132] In some embodiments, the temperature acquisition element 50 is a thermal sensor that is adapted to the working environment of the battery cell 20 and meets the requirements for temperature monitoring accuracy and reliability. Its selection, structure and installation method are matched with the structural characteristics of the protrusion 26 and the working conditions of the battery cell 20, so as to realize the real-time and stable acquisition of the temperature of the battery cell 20, and adapt to the sealing requirements and long-term working requirements of the battery cell 20.

[0133] Specifically, the sensing area of ​​the temperature acquisition element 50 is aligned with the central area of ​​the protrusion 26. The central area of ​​the protrusion 26 is the concentrated area for heat conduction of the end cover 22, which can more accurately reflect the core temperature of the battery cell 20.

[0134] The lead-out end of the temperature acquisition element 50 is arranged on the side away from the electrode terminal 23 and maintains a preset distance from the edge of the protrusion 26. This avoids interference from the electric field and heat generated by the electrode terminal 23 on the sensor signal, and facilitates wiring connection between the lead-out end and the flexible printed circuit board, avoiding damage from bending or pulling of the wires.

[0135] During operation, the heat generated inside the battery cell 20 is transferred to the end cap 22 through the electrode assembly 25 and electrolyte. The end cap 22 then conducts the heat to the protrusion 26, and the temperature of the protrusion 26 remains dynamically balanced with the temperature inside the battery cell 20. The temperature acquisition element 50, located on the surface of the protrusion 26, senses the temperature change of the protrusion 26 through the sensing area and converts the temperature signal into a corresponding resistance signal or voltage signal. This signal is then transmitted to the flexible printed circuit board via the lead-out terminal. The flexible printed circuit board then aggregates and transmits the signal to the battery management system. The battery management system acquires the temperature data of the battery cell 20 in real time based on the received signal, enabling real-time monitoring of the temperature of the battery cell 20. When the temperature exceeds a preset threshold, it promptly triggers protection strategies such as early warning, load reduction, and power cut-off, ensuring the safe operation of the battery cell 20.

[0136] In some embodiments, the temperature acquisition element 50 is disposed on the surface of the protrusion 26, and the temperature of the battery cell 20 is acquired by acquiring the temperature of the protrusion 26. The thermal conductivity of the protrusion 26 is used to provide real-time and accurate temperature acquisition, reduce the risk of short circuit and corrosion caused by sensor housing, simplify sensor assembly process, take into account acquisition reliability, structural safety and assembly convenience, and do not damage the sealing integrity of the battery cell 20.

[0137] In some embodiments, the voltage acquisition element 40 and the temperature acquisition element 50 can be set separately or simultaneously, both adapting to the structural design of the protrusion 26. The same protrusion 26 can simultaneously accommodate the installation of the temperature acquisition element 50 and the electrical connection of the voltage acquisition element 40, or different protrusions 26 can correspond to temperature acquisition and voltage acquisition respectively. Neither method affects the signal acquisition accuracy of their respective acquisition.

[0138] In this embodiment, by providing a protrusion 26 spaced apart from the electrode terminal 23 on the end cap 22 of the battery cell 20, and placing the temperature acquisition element 50 on the surface of the protrusion 26 and electrically connecting the voltage acquisition element 40 to the protrusion 26, the signal interference from other structures during the acquisition process of the temperature acquisition element 50 and the voltage acquisition element 40 can be reduced, the transmission path of temperature and voltage signals can be shortened, the sensing speed and detection accuracy of the working status of the battery cell 20 can be improved, and the monitoring of the battery cell 20 can be achieved more timely and accurate.

[0139] Figure 7 This is another structural diagram of the battery device according to an embodiment of this application. Figure 7As shown, multiple battery cells 20 include a first battery cell 201 and a second battery cell 202 connected in series. The first battery cell 201 includes a first protrusion 263 and a first electrode terminal, and the second battery cell 202 includes a second protrusion 264 and a second electrode terminal. The first protrusion 263 is electrically connected to the first electrode terminal, and the fourth protrusion 262 is electrically connected to the second electrode terminal. The first electrode terminal and the second electrode terminal have the same polarity. Two voltage acquisition devices 40 are respectively electrically connected to the first protrusion 263 and the second protrusion 264 to obtain the voltage between the first protrusion 263 and the second protrusion 264.

[0140] In this embodiment of the application, the battery device 100 includes at least two first battery cells 201 and second battery cells 202 arranged in series. The end cap 22 of the first battery cell 201 is integrally formed with a first protrusion 263, and the end cap 22 of the second battery cell 202 is integrally formed with a second protrusion 264. The first protrusion 263 is electrically connected to the first electrode terminal of the first battery cell 201, and the second protrusion 264 is electrically connected to the second electrode terminal of the second battery cell 202. The first electrode terminal and the second electrode terminal have the same polarity, so that the first protrusion 263 and the second protrusion 264 become the voltage extension leads of the two battery cells 20 respectively.

[0141] The two voltage acquisition units 40 are electrically connected to the first protrusion 263 and the second protrusion 264, respectively. Since the first protrusion 263 and the second protrusion 264 correspond to electrode terminals 23 with the same polarity, there is a potential difference between them. The voltage acquisition unit 40 can directly acquire this potential difference to obtain a voltage signal.

[0142] Two battery cells 20 are electrically connected via a busbar, which brings the connected electrode terminals 23 to the same potential, forming an equipotential node. The first protrusion 263 and the second protrusion 264 are respectively electrically connected to their corresponding electrode terminals 23 via low resistance to achieve equipotentiality. Therefore, the potential of the first protrusion 263 is the same as that of the first electrode terminal, and the potential of the second protrusion 264 is the same as that of the second electrode terminal. By measuring the voltage between the first protrusion 263 and the second protrusion 264, the voltage of the first battery cell 201 can be obtained.

[0143] The structured design of the protrusion 26 standardizes the wiring layout for voltage acquisition. At the same time, the integrated structure of the protrusion 26 and the end cover 22 can improve the stability of the electrical connection, enabling the voltage acquisition unit 40 to acquire the voltage signal between the two electrode terminals 23 and improve the reliability of voltage acquisition.

[0144] Both the first protrusion 263 and the second protrusion 264 protrude from the surface of the end cap 22 of the battery cell 20, providing an exposed and easily accessible dedicated connection point for the voltage acquisition component 40. This eliminates the need for additional acquisition connection structures on the electrode terminals 23, reducing assembly space interference between the voltage acquisition component 40 and the electrode terminals 23, as well as other structures of the battery cell 20. The first protrusion 263 and the second protrusion 264 serve as voltage lead-out points for the electrode terminals 23 of the two battery cells 20 with different polarities, replacing the method of directly drawing power from the electrode terminals 23. This provides a convenient and dedicated connection point for the voltage acquisition component 40, reducing the possibility of assembly interference and poor contact problems caused by direct connection between the voltage acquisition component 40 and the electrode terminals 23.

[0145] The arrangement of the first protrusion 263 and the second protrusion 264 eliminates the need to design voltage acquisition points on the busbar component, reduces contact resistance, avoids voltage loss during signal transmission, and enables the voltage acquisition device 40 to acquire the real voltage signal.

[0146] In this embodiment, a first protrusion 263 and a first electrode terminal are provided on the first battery cell 201, and a second protrusion 264 and a second electrode terminal are provided on the second battery cell 202. The first electrode terminal and the second electrode terminal have the same polarity. The voltage acquisition component 40 is electrically connected to the two protrusions to obtain the voltage of the first battery cell 201 or the second battery cell 202. The protrusion 264 is used as a voltage lead-out terminal, which reduces the assembly interference of the acquisition component and the electrode terminal 23 being directly connected, improves the stability of electrical connection and signal acquisition, reduces voltage transmission loss, and improves the accuracy and reliability of voltage acquisition.

[0147] Figure 8 This is another structural diagram of a battery cell according to an embodiment of this application. (See diagram below.) Figure 8 As shown, each of the multiple battery cells 20 includes a third electrode terminal 231 and a fourth electrode terminal 232 with opposite polarities. The protrusion 26 of each of the multiple battery cells 20 includes a third protrusion 261 and a fourth protrusion 262. The third protrusion 261 is electrically connected to the third electrode terminal 231, and the fourth protrusion 262 is electrically connected to the fourth electrode terminal 232. Two voltage acquisition devices 40 are electrically connected to the third protrusion 261 and the fourth protrusion 262 respectively to obtain the voltage between the third protrusion 261 and the fourth protrusion 262.

[0148] The end cap 22 of the battery cell 20 is equipped with a third electrode terminal 231 and a fourth electrode terminal 232 with opposite polarities. The third electrode terminal 231 is the power transmission interface of one pole (such as positive / negative pole) of the battery cell 20, and the fourth electrode terminal 232 is the power transmission interface of the other pole (such as negative / positive pole) of the battery cell 20. The two are respectively connected to the corresponding polarity tabs of the electrode assembly 25 inside the housing 212, so as to realize the charging and discharging power interaction between the battery cell 20 and the external circuit.

[0149] The end cap 22 is provided with a third protrusion 261 and a fourth protrusion 262. The third protrusion 261 is electrically connected to the third electrode terminal 231, and the fourth protrusion 262 is electrically connected to the fourth electrode terminal 232. Both the third protrusion 261 and the fourth protrusion 262 maintain the structural feature of protruding towards the side of the end cap 22 away from the electrode assembly 25. The orthographic projection of each of them toward the end cap 22 is also spaced apart from the orthographic projection of the connected third electrode terminal 231 and fourth electrode terminal 232 toward the end cap 22, without overlapping or intersecting.

[0150] The third protrusion 261 and the fourth protrusion 262 function as voltage acquisition connection terminals, used to form an electrical connection with the external voltage acquisition device 40. Since the third protrusion 261 is electrically connected to the third electrode terminal 231 and the fourth protrusion 262 is electrically connected to the fourth electrode terminal 232, and the two belong to different polarities of the battery cell 20, the two voltage acquisition devices 40 can directly detect the potential difference between the third protrusion 261 and the fourth protrusion 262 by establishing electrical connections with the two protrusions 261 respectively, thereby obtaining the real-time voltage of the battery cell 20, without the need to add additional voltage acquisition structures at other positions of the electrode terminal 23 or end cover 22.

[0151] Because the third protrusion 261 and the fourth protrusion 262 are designed to maintain a projection interval with the corresponding connected electrode terminal 23, the connection area between the voltage acquisition component 40 and the protrusion 26 is separated from the power transmission area of ​​the electrode terminal 23. This avoids structural interference and electromagnetic interference between the voltage acquisition circuit and the main power transmission circuit of the electrode terminal 23, and prevents the large current transmission of the main circuit from affecting the accuracy of voltage acquisition.

[0152] By leveraging the integrated design of the protrusion 26, which serves as both an electrical connection carrier and a voltage acquisition point, the voltage detection function can be achieved without increasing the number of components or assembly steps of the battery cell 20, without altering the core structural layout of the battery cell 20, and without occupying the effective space within the housing 212, thus balancing the structural simplicity and functional practicality of the battery cell 20.

[0153] In this embodiment, by providing matching third protrusions 261 and fourth protrusions 262 on the end cap 22 corresponding to the positive and negative electrode terminals 23, the voltage acquisition unit 40 can directly detect the potential of the two protrusions 26 to obtain the voltage of the battery cell 20 by utilizing the equipotential characteristics of the protrusions 26 and the electrode terminals 23. This simplifies the structure of the battery cell 20, reduces assembly complexity, and improves the stability and reliability of voltage detection.

[0154] In some embodiments, the third protrusion 261 is electrically connected to the third electrode terminal 231 via a conductive element; and / or the fourth protrusion 262 is electrically connected to the fourth electrode terminal 232 via a conductive element.

[0155] In some embodiments, the conductive component can be a wire, conductive sheet, conductive spring, conductive post, conductive rivet, conductive connecting plate, or other structural component capable of achieving electrical conduction between two points. The wire can be a metal wire with good conductivity, such as copper wire, aluminum wire, or tin-plated wire. The conductive connecting plate can be a plate-shaped, sheet-shaped, or strip-shaped conductive structure, such as a copper busbar, aluminum busbar, busbar, busbar, metal connecting piece, metal adapter plate, or flexible connecting plate.

[0156] In some embodiments, the electrical connection between the third protrusion 261 and the third electrode terminal 231, and between the fourth protrusion 262 and the fourth electrode terminal 232, can be achieved by laser welding of wires or riveting of conductive parts.

[0157] Specifically, when using laser welding to connect wires, the two ends of the wire leads can be laser welded to the protrusion 26 and the corresponding electrode terminal 23 respectively. The welded surfaces of the laser welding are tightly bonded, which can reduce contact resistance and improve conductivity stability. At the same time, the wire leads can flexibly adapt to the spacing layout of the protrusion 26 and the electrode terminal 23, and adapt to the structural design of different end caps 22.

[0158] When using conductive riveting for connection, conductive rivets can be inserted and fixed to the preset connection positions of the protrusion 26 and the corresponding electrode terminal 23. The rigid connection characteristics of the conductive rivets achieve both mechanical fixation and electrical connection. The conductive rivets are made of conductive metal, enabling smooth power transmission. Furthermore, the conductive riveting connection method has a robust structure and good vibration resistance, preventing problems such as loosening and poor contact during long-term use.

[0159] Both laser welding of wires and riveting of conductive parts can achieve stable electrical connection between the protrusion 26 and the corresponding electrode terminal 23, making the potential of the protrusion 26 and the electrode terminal 23 consistent, thereby improving the accuracy of the voltage acquisition device 40 in obtaining the voltage of the battery cell 20 by detecting the potential difference between the two protrusions 26.

[0160] By laser welding wires or riveting conductive parts, the third protrusion 261 and the fourth protrusion 262 are directly connected to the electrode terminal 23 to form a metallurgical bond or a tight mechanical conductive connection, eliminating the need for an additional transfer structure. The large contact area and dense interface bonding can reduce contact resistance and overall circuit resistance, achieving a low-resistance electrical connection and meeting the requirements of high current transmission and low loss.

[0161] In this embodiment of the application, by electrically connecting the third protrusion 261 to the third electrode terminal 231 and the fourth protrusion 262 to the fourth electrode terminal 232 through conductive components, the current can be stably transmitted between the corresponding structures, reducing contact resistance and improving the accuracy of voltage acquisition.

[0162] In some embodiments, the temperature acquisition element 50 includes a thermistor disposed on the surface of the protrusion 26 and connected to the protrusion 26 by adhesive bonding or welding.

[0163] A thermistor is disposed on the surface of the protrusion 26 and is in close contact with the surface of the protrusion 26. It senses the temperature of the protrusion 26 to collect the temperature of the battery cell 20.

[0164] The thermistor is a miniaturized thermal sensing element that fits the surface mounting space of the protrusion 26. It has the characteristics of fast response speed, high temperature measurement accuracy and compact structure. It can quickly capture the temperature change of the protrusion 26, and the protrusion can conduct heat inside the battery cell 20, so that the thermistor can reflect the actual heating state of the battery cell 20 by detecting the temperature of the protrusion 26.

[0165] The thermistor is located on the surface of the protrusion 26, away from the area where the electrode terminals 23 are arranged, to avoid interference from the electric field and heat of the electrode terminals 23, to ensure the stability of the temperature acquisition signal, and does not need to extend into the housing 212 of the battery cell 20, thus avoiding the risk of short circuit and corrosion caused by contact with the electrolyte and electrode assembly 25, and does not damage the sealing integrity of the battery cell 20, thus balancing the reliability of temperature measurement and the structural safety of the battery cell 20.

[0166] The thermistor is a miniature thermistor adapted to the operating conditions of the battery cell 20. It can be a negative temperature coefficient (NTC) thermistor. Its exterior can be covered with a high-temperature resistant, aging-resistant, insulating, and thermally conductive encapsulation layer to protect the internal thermistor core and quickly conduct heat. It has the characteristics of high temperature measurement accuracy, fast temperature response speed, and compact structure. It is adapted to the mounting space on the surface of the protrusion 26 and the operating conditions of the battery cell 20. Its temperature measurement range covers the entire operating temperature range of the battery cell 20. The conductive leads can be stably electrically connected to the flexible printed circuit board and can convert the sensed temperature change into an electrical signal for stable transmission.

[0167] The thermistor's leads are positioned away from the electrode terminal 23, and its conductive pins are electrically connected to the corresponding points on the flexible printed circuit board. This allows for the stable transmission of the collected temperature signals to the flexible printed circuit board, which then aggregates and transmits them to the battery management system, enabling real-time monitoring of the battery cell 20's temperature. Furthermore, the thermistor is entirely mounted on the surface of the protrusion 26, eliminating the need for additional openings or processing on the end cap 22. This improves the overall sealing performance and structural strength of the battery cell 20, meeting the long-term operational requirements of the battery cell 20.

[0168] If the end cap 22 is provided with multiple protrusions 26, and each protrusion 26 is provided with a thermistor, each thermistor independently collects the temperature signal at the corresponding position and transmits it separately, so as to realize multi-point temperature monitoring at different positions of the battery cell 20, which can comprehensively reflect the temperature field distribution of the battery cell 20 and timely detect local overheating anomalies.

[0169] The thermistor is fixedly connected to the protrusion 26 by bonding or welding. Both connection methods can achieve a tight fit between the thermistor and the surface of the protrusion 26, eliminating contact thermal resistance and ensuring that the heat inside the battery cell 20 is efficiently conducted to the thermistor through the protrusion 26, ensuring the real-time and accurate temperature acquisition. At the same time, the bonding or welding connection method has good connection stability, which can prevent the thermistor from shifting or falling off under the conditions of transportation, vibration, charging and discharging of the battery cell 20, ensuring the continuity of the temperature measurement function. Moreover, both connection methods are adapted to the structural characteristics of the protrusion 26, without the need for complex processing of the protrusion 26, and without damaging the overall structure of the end cover 22 and the protrusion 26 or the sealing integrity of the battery cell 20.

[0170] The thermistor can be fixedly connected to the surface of the protrusion 26 by either adhesive bonding or welding. When using adhesive bonding, a thermally conductive adhesive with high thermal conductivity, high temperature resistance, and aging resistance (such as silicone thermally conductive adhesive or epoxy thermally conductive adhesive) is selected. The thermally conductive adhesive is applied to the contact area between the thermistor and the protrusion 26. After curing, the two are bonded together without gaps. The thermally conductive adhesive not only ensures rapid heat conduction but also fixes and protects the thermistor. It also has good insulation properties to avoid electrical interference with the metal material of the protrusion 26.

[0171] When using the welding method, metal pads are pre-set at corresponding positions on the surface of the protrusion 26. The pins of the thermistor are welded and fixed to the pads through reflow soldering, laser welding, or other methods. The welded connection has low contact resistance and stronger structural stability, which can further improve heat conduction efficiency and signal transmission stability.

[0172] Both connection methods allow the thermistor to be firmly attached to the surface of the protrusion 26, away from the area where the electrode terminals 23 are located, avoiding interference from electric field and heat. Furthermore, the welding or bonding operations are all completed outside the battery cell 20, without needing to extend into the housing 212, thus not affecting the sealing performance and overall structural strength of the battery cell 20, and adapting to the assembly requirements of mass production.

[0173] In this embodiment, a thermistor is used as the temperature acquisition element 50 and is directly disposed on the surface of the protrusion 26. Utilizing the thermistor's fast response and high accuracy, combined with the thermal conductivity of the protrusion 26, rapid temperature acquisition of the battery cell 20 is achieved. Furthermore, the thermistor is located away from the electrode terminals 23 to avoid interference, and its external placement does not damage the battery seal, thus balancing temperature measurement reliability, structural safety, and ease of assembly. The thermistor is connected to the protrusion 26 by bonding or welding, both methods achieving proper adhesion and fixation, eliminating contact thermal resistance, improving heat conduction efficiency, and enhancing the accuracy and continuity of temperature acquisition. Both connection methods are simple to manufacture, highly adaptable, and do not damage the battery cell 20's seal or overall structure, balancing temperature measurement reliability and ease of production and assembly.

[0174] In some embodiments, the thermistor is connected to the protrusion 26 by silicone or epoxy thermally conductive adhesive; or the thermistor is connected to the protrusion 26 by laser welding.

[0175] The thermistor can be fixedly connected to the protrusion 26 by bonding with silicone-based thermal conductive adhesive or epoxy-based thermal conductive adhesive, or by laser welding. Both connection methods are suitable for the structural characteristics of the protrusion 26 and the working conditions of the battery cell 20, and can achieve a tight fit between the thermistor and the surface of the protrusion 26, reducing the possibility of the thermistor falling off.

[0176] The above connection method can eliminate the contact thermal resistance between the thermistor and the protrusion 26, so that the heat inside the battery cell 20 can be conducted to the thermistor through the protrusion 26, ensuring the real-time and accurate temperature acquisition.

[0177] Both silicone or epoxy thermally conductive adhesive bonding and laser welding connection methods have good structural stability, which can avoid problems such as displacement, detachment, and poor contact of the thermistor in the battery cell 20 under complex working conditions such as transportation, vibration, and charging and discharging, and maintain the continuous stability of the temperature measurement function. At the same time, both connection methods are completed outside the battery cell 20, without the need for complex processing of the end cover 22 and the protrusion 26, and without compromising the sealing integrity and overall structural strength of the battery cell 20.

[0178] Specifically, the thermistor is bonded to the surface of the protrusion 26 using a silicone-based thermally conductive adhesive. This adhesive possesses high thermal conductivity, excellent temperature resistance, and aging resistance, and exhibits good compatibility with both the metal material of the protrusion 26 and the encapsulation layer of the thermistor. After being evenly applied to the bonding area and cured, a gapless bond is achieved between the thermistor and the protrusion 26, eliminating contact thermal resistance and ensuring that heat from the battery cell 20 is rapidly conducted to the thermistor via the protrusion 26. The silicone-based thermally conductive adhesive also possesses excellent insulation properties, preventing electrical interference between the thermistor and the protrusion 26, and buffering vibration and impact, thus protecting the thermistor. Furthermore, this bonding method is simple to operate, requiring no additional processing of the protrusion 26, and does not affect the overall structure of the end cap 22 and the protrusion 26, nor the sealing integrity of the battery cell 20.

[0179] The thermistor is bonded to the protrusion 26 using epoxy-based thermally conductive adhesive. The epoxy-based adhesive has high bonding strength and high thermal conductivity. After curing, the bonding interface is tightly bonded, ensuring a firm fixation between the thermistor and the protrusion 26. This effectively prevents the thermistor from shifting or falling off during transportation, charging / discharging, and vibration of the battery cell 20, ensuring the continuous stability of the temperature measurement function. Furthermore, the adhesive exhibits low deformation after curing, maintaining a tight bond between the two over a long period, ensuring efficient and stable heat transfer. It also possesses good chemical stability, is compatible with the working environment of the battery cell 20, releases no harmful substances, and has excellent insulation properties, preventing interference with the thermistor's signal acquisition. The bonding process is simple and suitable for the assembly needs of large-scale production.

[0180] The thermistor is fixedly connected to the protrusion 26 by laser welding. Laser welding relies on the high precision and small heat-affected zone of the process to accurately weld the thermistor to the preset position of the protrusion 26. The weld joint has high bonding strength and can achieve rigid fixation between the two, avoiding contact problems caused by vibration and impact. At the same time, the contact resistance of laser welding is extremely low, which can further improve the heat conduction efficiency, allowing the heat inside the battery cell 20 to be conducted to the thermistor more quickly and without loss, ensuring the real-time and accurate temperature acquisition. There is no connection gap after welding, which does not affect the sealing reliability of the battery cell 20, making it suitable for application scenarios with higher requirements for connection strength and heat conduction efficiency.

[0181] In this embodiment, the thermistor is connected to the protrusion 26 by bonding with silicone or epoxy thermally conductive adhesive or by laser welding. Both methods can achieve bonding and fixation between the two, eliminate contact thermal resistance, improve heat conduction efficiency, maintain the accuracy of temperature acquisition and the continuity of monitoring, and the connection process is highly adaptable and easy to operate, which can take into account both temperature measurement reliability and production assembly convenience.

[0182] In some embodiments, the surface of the thermistor away from the protrusion 26 is covered with an insulating layer.

[0183] In some embodiments, an insulating layer is provided on the outer surface of the thermistor, which completely covers the outer body of the thermistor, exposing only the conductive leads for electrical connection.

[0184] In some embodiments, the thermistor can be connected to the flexible printed circuit board of the battery device 100 via wires to obtain the temperature of the battery cell 20. The outer surface of the thermistor's wires is also covered with an insulating layer, which continuously covers the insulating layer of the thermistor body, achieving full-length insulation protection for the wires.

[0185] In some embodiments, the insulating layer can be made of insulating materials such as polyimide, epoxy resin, and modified silicone, which have high insulation, high thermal conductivity, high temperature resistance, and aging resistance. It can completely cover the entire outer surface of the thermistor except for the conductive leads through processes such as dip coating, coating, and molding.

[0186] In some embodiments, an insulating layer can be formed on the outer surface of the thermistor by spraying insulating varnish. The uniformly sprayed insulating varnish forms a dense and thin insulating protective structure on the surface of the thermistor, thereby achieving electrical isolation between the thermistor and the metal surface of the protrusion 26.

[0187] Specifically, the insulating varnish can be selected from varnishes that are resistant to high temperature, high thermal conductivity, excellent insulation performance and aging resistance. In particular, silicone insulating varnish, epoxy insulating varnish, polyimide insulating varnish or conformal coating can be selected.

[0188] In some embodiments, the thickness of the insulating layer is controlled to be 0.05~0.3mm, which can satisfy the insulation protection performance and control the thickness of the heat conduction path to reduce heat conduction loss.

[0189] The insulating layer is directly attached to the metal surface of the protrusion 26, which can block the electrical path between the thermistor and the protrusion 26, avoid short circuit problems caused by contact between the two, prevent the electric field of the electrode terminal 23 from being conducted to the thermistor through the protrusion 26 and interfering with the temperature acquisition signal, and ensure the stability of the output electrical signal of the thermistor.

[0190] Meanwhile, the insulating layer has good chemical stability and does not react chemically with the material of the protrusion 26, the thermally conductive adhesive (if adhesive is used) or the welding medium. It is suitable for the working environment of the battery cell 20 and can resist mechanical influences such as vibration and minor scratches inside the battery device 100, protect the integrity of the internal thermistor core structure, and extend the service life of the thermistor.

[0191] The insulating layer can not only achieve electrical isolation between the thermistor and the metal surface of the protrusion 26, avoiding electrical interference problems such as short circuits and leakage between the thermistor and the protrusion 26, and preventing the temperature acquisition signal from being affected by electrical interference and affecting the monitoring accuracy, but also protect the internal thermistor core of the thermistor, isolating it from external moisture, dust and the complex working environment inside the battery device 100, preventing the thermistor core from being damaged by corrosion and scratches, and improving the working stability and service life of the thermistor.

[0192] In some embodiments, the insulating layer can also be made of a material with high thermal conductivity, which, while achieving insulation protection, will not significantly increase the thermal conduction resistance, allowing the heat from the protrusion 26 to be quickly and efficiently conducted to the thermistor core, improving the real-time performance and accuracy of temperature acquisition. Furthermore, the insulating layer structure is thin and has good adhesion, does not occupy additional installation space, and is suitable for the compact installation requirements of the thermistor on the surface of the protrusion 26.

[0193] In this embodiment, the surface of the thermistor away from the protrusion 26 is covered with an insulating layer, which can achieve electrical isolation between the thermistor and the metal surface of the protrusion 26, avoid short circuits and electrical signal interference, and at the same time protect the electrode assembly 25, thereby improving the working stability and service life of the thermistor.

[0194] Figure 9 This is another structural diagram of a battery cell according to an embodiment of this application. Figure 9 As shown, the battery cell 20 includes multiple protrusions 26, which are spaced apart on the end cap 22 and are used to collect the temperature at different locations of the battery cell 20.

[0195] Multiple protrusions 26 are arranged at intervals on the end cover 22, and each protrusion 26 protrudes toward the side of the end cover 22 away from the electrode assembly 25. The orthographic projection of each protrusion 26 on the end cover 22 is spaced apart from the orthographic projection of the electrode terminal 23 to avoid the electric field and heat generated by the electrode terminal 23 during operation from interfering with the temperature acquisition.

[0196] Multiple protrusions 26 correspond to different monitoring areas inside the battery cell 20, and are used to collect the temperature at different locations of the battery cell 20. By collecting data from multiple points simultaneously, the temperature field distribution data inside the battery cell 20 can be obtained. Compared with single-point collection, it can more comprehensively and accurately reflect the actual heating state of the battery cell 20, and promptly capture abnormal situations such as local overheating and uneven temperature, thereby improving the comprehensiveness of temperature monitoring and the accuracy of early warning.

[0197] Specifically, in the early thermal simulation analysis stage of the battery cell 20, the temperature field distribution law of the battery cell 20 under typical working conditions such as charging and discharging, high and low temperatures is simulated to locate the highest temperature area, the lowest temperature area, and the characteristic area that can characterize the overall average temperature inside the battery cell 20. Correspondingly, a protrusion 26 is set at the corresponding projection position of the end cover 22 to realize targeted monitoring of the temperature points of the battery cell 20.

[0198] Multiple protrusions 26 are integrated into the end cover 22, eliminating the need for additional independent mounting bases and adapters. While achieving multi-point data acquisition, it does not excessively occupy the surface space of the end cover 22, nor does it compromise the structural integrity and sealing performance of the end cover 22, thus balancing monitoring accuracy, structural simplicity, and safety in use.

[0199] In this embodiment, by setting multiple protrusions 26 at intervals on the end cover 22 to collect the temperature at different locations of the battery cell 20, multi-point monitoring of the internal temperature of the battery cell 20 can be achieved. This can comprehensively reflect the actual heating state and temperature field distribution of the battery cell 20, and timely capture abnormal situations such as local overheating and uneven temperature, thereby improving the comprehensiveness of temperature monitoring and the accuracy of early warning.

[0200] In some embodiments, the protrusion 26 and the end cap 22 are integrally formed by stamping.

[0201] In some embodiments, the protrusion 26 and the end cap 22 are integral structures, formed by stamping in one step.

[0202] Specifically, the end cap 22 can be made of metal sheet suitable for stamping, such as aluminum alloy or stainless steel. The end cap 22 is stretched and extruded in a predetermined area by a pre-set mold, so that the sheet material protrudes to the side away from the electrode assembly 25, directly forming a protrusion 26 that is integrated with the body of the end cap 22. There is no need to fix the protrusion 26 to the end cap 22 through subsequent assembly processes such as welding, screwing, or bonding.

[0203] The one-piece structure reduces heat conduction resistance, allowing the temperature inside the battery cell 20 to be transferred to the protrusion 26 more quickly and evenly, thus improving the response speed and accuracy of temperature acquisition.

[0204] The position and size of the protrusion 26 are uniformly controlled through the mold, resulting in higher product consistency and facilitating the subsequent installation and testing of data acquisition components.

[0205] The one-piece stamping structure eliminates the need for separate processing and assembly of the protrusion 26, simplifies the manufacturing process of the end cap 22, improves mass production efficiency, and reduces production costs.

[0206] The protrusion 26 and the end cap 22 are an integral structure without any splicing gaps. This not only meets the structural strength and rigidity requirements of the end cap 22 and improves the vibration and impact resistance of the battery cell 20, but also avoids the sealing risks caused by assembly gaps, ensuring the sealing reliability of the battery cell 20 housing 212 and preventing electrolyte leakage.

[0207] In this embodiment, the protrusion 26 and the end cap 22 are integrally formed by stamping, eliminating the need for separate processing and secondary assembly of the protrusion 26, simplifying the manufacturing process of the end cap 22, improving production efficiency and reducing costs; the one-piece structure has no connecting gaps, which not only enhances the overall structural strength and vibration and impact resistance of the end cap 22, but also eliminates the sealing hazards caused by assembly gaps, ensuring the sealing reliability of the battery cell 20 and preventing electrolyte leakage; at the same time, it reduces the thermal resistance of heat conduction contact, allowing the heat inside the battery cell 20 to be quickly and evenly conducted to the protrusion 26, improving the response speed and accuracy of temperature acquisition.

[0208] Figure 10 This is another structural diagram of the battery device according to an embodiment of this application. Figure 10 As shown, the battery device 100 also includes a flexible printed circuit board 30. The projection of the flexible printed circuit board 30 toward the end cover 22 and the projection of the protrusion 26 toward the end cover 22 are spaced apart. The voltage acquisition element 40 and / or the temperature acquisition element 50 are electrically connected to the flexible printed circuit board 30. The flexible printed circuit board 30 is used to transmit the voltage signal acquired by the voltage acquisition element 40 and / or the temperature signal acquired by the temperature acquisition element 50.

[0209] The flexible printed circuit board 30 (FPC) is the signal acquisition and transmission hub. It connects the sampling points of each battery cell 20 through conductive lines, collects and summarizes the voltage and temperature signals of each battery cell 20, and transmits them to the battery management system. At the same time, it also has the safety protection function of integrated fuse, as well as the structural advantages of lightweight and flexible adaptation to complex spaces. It is a key component to ensure the safe and efficient operation of the battery system.

[0210] The flexible printed circuit board 30 is characterized by its bendability, high wiring density, and strong spatial adaptability. It can adapt to the complex assembly space inside the battery device 100, fit the shape layout of the battery cell 20, reduce the space occupied inside the battery device 100, and improve the structural integration.

[0211] The protrusion 26 serves as a structure for collecting and executing the temperature and voltage data of the battery cell 20. Its integrated data collection element can be connected to the conductive lines of the flexible printed circuit board 30 through electrical connection methods such as conductive contacts, conductive pins, and soldering.

[0212] The projections of the flexible printed circuit board 30 toward the end cover 22 and the projections of the protrusion 26 toward the end cover 22 are spaced apart, which reduces the possibility of structural interference between the flexible printed circuit board 30 and the protrusion 26 during assembly, ensuring that both can be stably installed in the preset position without affecting each other's structural integrity and performance. At the same time, no additional installation space is required, and the assembly height of the flexible printed circuit board 30 is not increased, thus not affecting the overall height of the battery cell 20, adapting to the compact installation requirements of the battery device 100.

[0213] The flexible printed circuit board 30 has a pre-set corresponding signal transmission line, which can transmit voltage acquisition signals and temperature acquisition signals separately, or integrate the transmission of the two types of signals. It can transmit the electrical signals of the battery cell 20 collected by the protrusion 26 to the management component of the battery device 100 in a unified manner, so as to realize the centralized transmission and processing of signals.

[0214] Specifically, the flexible printed circuit board 30 has mating contact points corresponding to the protrusion 26. These contact points are connected to the signal traces inside the flexible printed circuit board 30. The flexible printed circuit board 30 is securely electrically connected to the conductive contact area of ​​the protrusion 26 through surface mounting, laser welding, conductive adhesive bonding, or other methods. The flexible printed circuit board 30 independently divides voltage signal traces and temperature signal traces, isolating the two types of traces to reduce crosstalk during signal transmission. The voltage and / or temperature signals of the battery cells 20 collected by the protrusion 26 are transmitted to the flexible printed circuit board 30 via the conductive contact area, and then transmitted to the battery management system through the corresponding traces, realizing real-time acquisition and monitoring of the operating parameters of the battery cells 20.

[0215] In some embodiments, the flexible printed circuit board 30 can be adapted to the arrangement structure of multiple battery cells 20, and simultaneously realize the electrical connection and signal aggregation transmission of the protrusions 26 of multiple battery cells 20, thereby improving the integration level of signal acquisition of the battery device 100. In addition, the flexible printed circuit board 30 can be bent and deformed, and can be adapted to battery cell groups of different specifications and different arrangement forms, thereby broadening the structural adaptation range of the battery device 100, while simplifying the assembly process and improving the production and assembly efficiency of the battery device 100.

[0216] This cooperative structure, on the one hand, leverages the structural characteristics of the flexible printed circuit board 30 to optimize the wiring layout inside the battery device 100, avoiding the problems of limited installation and messy wiring of rigid circuit boards, and reducing the risk of interference during signal transmission; on the other hand, through the direct electrical connection between the protrusion 26 and the flexible printed circuit board 30, it simplifies the signal transmission transfer structure, reduces signal attenuation, and ensures the stability and accuracy of voltage and / or temperature signal transmission, providing a reliable data transmission foundation for the status monitoring and safety management of the battery device 100.

[0217] Voltage acquisition unit 40 and / or temperature acquisition unit 50 are electrically connected to flexible printed circuit board 30 to form a signal acquisition and transmission system, optimize the wiring structure of battery device 100, and improve integration.

[0218] In some embodiments, the voltage acquisition device 40 can be connected to the voltage acquisition line on the flexible printed circuit board 30. The voltage signal of the battery cell 20 acquired by the voltage acquisition device 40 is transmitted to the voltage transmission line of the flexible printed circuit board 30 through the connection point, so as to realize the orderly transmission of the voltage signal.

[0219] In some embodiments, the temperature acquisition device 50 (such as a thermistor) can be connected to the temperature acquisition line on the flexible printed circuit board 30 through its own conductive wire. The temperature signal of the battery cell 20 captured by the temperature acquisition device 50 is transmitted to the temperature transmission line of the flexible printed circuit board 30 through the wire to complete the initial aggregation of the temperature signal.

[0220] The flexible printed circuit board 30 is used to transmit the voltage signal collected by the voltage acquisition unit 40 and / or the temperature signal collected by the temperature acquisition unit 50. It is thin, flexible and has high wiring density, which can fit the compact installation space inside the battery device 100 and fit the shape layout of the end cover 22 and the battery cell 20. It does not need to occupy too much installation space, and at the same time, it can reduce the mess caused by wiring and facilitate the later assembly, inspection and maintenance.

[0221] The flexible printed circuit board 30 integrates voltage transmission lines and temperature transmission lines, which are isolated from each other, effectively avoiding crosstalk between voltage and temperature signals, so that both signals can be transmitted stably and efficiently to the subsequent battery management system or control module.

[0222] In this embodiment, by setting the projection intervals between the flexible printed circuit board 30 and the protrusion 26 on the end cover 22, assembly interference can be avoided without increasing the overall height of the battery cell 20. By electrically connecting the voltage acquisition device 40 and / or the temperature acquisition device 50 through the flexible printed circuit board 30 to transmit voltage and / or temperature signals, the wiring structure can be simplified, the signal transmission stability and integration can be improved, signal transmission interference and attenuation can be reduced, and the reliability and accuracy of battery cell 20 status monitoring can be improved.

[0223] This application embodiment also provides a battery cell 20, which includes a housing 212 and an electrode assembly 25. The housing 212 includes an end cap 22, which includes electrode terminals 23. The electrode terminals 23 include a third electrode terminal 231 and a fourth electrode terminal 232 with opposite polarities. The electrode assembly 25 is located inside the housing 212. The end cap 22 includes a protrusion 26, which protrudes toward the side of the end cap 22 away from the electrode assembly 25. The protrusion 26 is spaced apart from the electrode terminals 23. The protrusion 26 includes a third protrusion 261 and a fourth protrusion 262. The third protrusion 261 is electrically connected to the third electrode terminal 231, and the fourth protrusion 262 is electrically connected to the fourth electrode terminal 232. The third protrusion 261 and the fourth protrusion 262 are used to form an electrical connection with a voltage acquisition device 40.

[0224] In this embodiment, by providing a protrusion 26 on the side of the end cap 22 of the battery cell 20 away from the electrode assembly 25, and arranging the protrusion 26 and the end cap 22 of the electrode terminal 23 at an orthographic projection interval, it is possible to provide installation and electrical connection points for the acquisition of signals from the battery cell 20 without affecting the normal conductive output of the electrode terminal 23. This simplifies the monitoring structure of the battery cell 20, improves the stability, timeliness and accuracy of temperature and voltage signal acquisition, and helps to improve the reliability of monitoring the working status of the battery cell 20.

[0225] In some embodiments, the third protrusion 261 is electrically connected to the third electrode terminal 231 via a conductive element; and / or the fourth protrusion 262 is electrically connected to the fourth electrode terminal 232 via a conductive element.

[0226] According to some embodiments of this application, this application also provides an electrical device, which may include a battery device 100.

[0227] It should be understood that the battery device 100 can be the battery device 100 in any of the above embodiments or the battery cell 20 in any of the above embodiments. The electrical device can be a device or system that uses the battery device 100 in any of the above embodiments.

[0228] In some embodiments, the battery device 100 is used to provide electrical energy.

[0229] According to some embodiments of this application, see Figures 5 to 10This application provides a battery device 100, including: a plurality of battery cells 20, each of the plurality of battery cells 20 including a housing 212 and an electrode assembly 25, the electrode assembly 25 being housed in the housing 212, the housing 212 including an end cap 22, the end cap 22 including an electrode terminal 23 and a protrusion 26, the protrusion 26 protruding toward the side of the end cap 22 away from the electrode assembly 25, the protrusion 26 and the electrode terminal 23 being spaced apart; a voltage acquisition element 40 and a temperature acquisition element 50; the voltage acquisition element 40 being electrically connected to the protrusion 26, the protrusion 26 being electrically connected to the electrode terminal 23, the voltage acquisition element 40 being used to acquire the voltage of the protrusion 26 of at least two of the plurality of battery cells 20, and / or, the voltage acquisition element 40 being used to acquire the voltage of at least two protrusions 26 on each of the plurality of battery cells 20; the temperature acquisition element 50 being disposed on the surface of the protrusion 26.

[0230] In some embodiments, a plurality of battery cells 20 include a first battery cell 201 and a second battery cell 202 connected in series. The first battery cell 201 includes a first protrusion 263 and a first electrode terminal, and the second battery cell 202 includes a second protrusion 264 and a second electrode terminal. The first protrusion 263 is electrically connected to the first electrode terminal, and the fourth protrusion 262 is electrically connected to the second electrode terminal. The first electrode terminal and the second electrode terminal have the same polarity. Two voltage acquisition devices 40 are electrically connected to the first protrusion 263 and the second protrusion 264 respectively to obtain the voltage between the first protrusion 263 and the second protrusion 264.

[0231] In some embodiments, the electrode terminals 23 of each of the plurality of battery cells 20 include a third electrode terminal 231 and a fourth electrode terminal 232 with opposite polarities, and the protrusions 26 of each of the plurality of battery cells 20 include a third protrusion 261 and a fourth protrusion 262, the third protrusion 261 being electrically connected to the third electrode terminal 231, and the fourth protrusion 262 being electrically connected to the fourth electrode terminal 232; wherein, two voltage acquisition devices 40 are respectively electrically connected to the third protrusion 261 and the fourth protrusion 262 to obtain the voltage between the third protrusion 261 and the fourth protrusion 262.

[0232] The third protrusion 261 is electrically connected to the third electrode terminal 231 via a conductive element; and / or the fourth protrusion 262 is electrically connected to the fourth electrode terminal 232 via a conductive element.

[0233] The temperature acquisition element 50 includes a thermistor, which is disposed on the surface of the protrusion 26 and is connected to the protrusion 26 by adhesive or welding.

[0234] The surface of the thermistor furthest from the protrusion 26 is covered with an insulating layer. The battery cell 20 includes multiple protrusions 26 spaced apart from the end cap 22 for collecting temperature data at different locations within the battery cell 20. The protrusions 26 and the end cap 22 are integrally formed by stamping.

[0235] The battery device 100 also includes a flexible printed circuit board 30, with the projection of the flexible printed circuit board 30 toward the end cover 22 and the projection of the protrusion 26 toward the end cover 22 spaced apart. The voltage acquisition element 40 and / or the temperature acquisition element 50 are electrically connected to the flexible printed circuit board 30, and the flexible printed circuit board 30 is used to transmit the voltage signal acquired by the voltage acquisition element 40 and / or the temperature signal acquired by the temperature acquisition element 50.

[0236] 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: Multiple battery cells, each of the multiple battery cells including a housing (212) and an electrode assembly (25), the electrode assembly (25) being housed in the housing (212), the housing (212) including an end cap (22), the end cap (22) including an electrode terminal (23) and a protrusion (26), the protrusion (26) protruding toward the side of the end cap (22) away from the electrode assembly (25), the protrusion and the electrode terminal (23) being spaced apart; A voltage acquisition device (40) is electrically connected to the protrusion (26), which is electrically connected to the electrode terminal (23). The voltage acquisition device (40) is used to acquire the voltage of the protrusion (26) of at least two of the plurality of battery cells, and / or, the voltage acquisition device (40) is used to acquire the voltage of at least two protrusions (26) on each of the plurality of battery cells. Temperature acquisition element (50) is disposed on the surface of the protrusion (26).

2. The battery device according to claim 1, characterized in that, The plurality of battery cells include a first battery cell (201) and a second battery cell (202) connected in series. The first battery cell (201) includes a first protrusion (263) and a first electrode terminal, and the second battery cell (202) includes a second protrusion (264) and a second electrode terminal. The first protrusion (263) is electrically connected to the first electrode terminal, and the second protrusion (264) is electrically connected to the second electrode terminal. The first electrode terminal and the second electrode terminal have the same polarity. The two voltage acquisition devices (40) are electrically connected to the first protrusion (263) and the second protrusion (264) respectively to obtain the voltage between the first protrusion (263) and the second protrusion (264).

3. The battery device according to claim 1, characterized in that, Each of the plurality of battery cells has an electrode terminal including a third electrode terminal (231) and a fourth electrode terminal (232) with opposite polarities. Each of the plurality of battery cells has a protrusion (26) including a third protrusion (261) and a fourth protrusion (262). The third protrusion (261) is electrically connected to the third electrode terminal (231), and the fourth protrusion (262) is electrically connected to the fourth electrode terminal (232). The two voltage acquisition devices (40) are electrically connected to the third protrusion (261) and the fourth protrusion (262) respectively to obtain the voltage between the third protrusion (261) and the fourth protrusion (262).

4. The battery device according to claim 3, characterized in that, The third protrusion (261) and the third electrode terminal (231) are electrically connected via a conductive element; and / or The fourth protrusion (262) and the fourth electrode terminal (232) are electrically connected by a conductive element.

5. The battery device according to claim 1, characterized in that, The temperature acquisition device (50) includes a thermistor, which is disposed on the surface of the protrusion (26) and is connected to the protrusion (26) by bonding or welding.

6. The battery device according to claim 5, characterized in that, The surface of the thermistor away from the protrusion (26) is covered with an insulating layer.

7. The battery device according to any one of claims 1 to 6, characterized in that, The battery cell includes a plurality of protrusions (26), which are spaced apart on the end cap (22) for collecting the temperature at different locations of the battery cell.

8. The battery device according to any one of claims 1 to 6, characterized in that, The protrusion (26) and the end cap (22) are integrally formed by stamping.

9. The battery device according to any one of claims 1 to 6, characterized in that, The battery device further includes a flexible printed circuit board (30), the projection of the flexible printed circuit board (30) toward the end cap (22) and the projection of the protrusion (26) toward the end cap (22) are spaced apart, the voltage acquisition element (40) and / or the temperature acquisition element (50) are electrically connected to the flexible printed circuit board (30), and the flexible printed circuit board (30) is used to transmit the voltage signal acquired by the voltage acquisition element (40) and / or the temperature signal acquired by the temperature acquisition element (50).

10. A single battery cell, characterized in that, include: The housing (212) includes an end cap (22), the end cap (22) includes an electrode terminal (23), the electrode terminal (23) includes a third electrode terminal (231) and a fourth electrode terminal (232) with opposite polarities. Electrode assembly (25), the electrode assembly (25) being located within the housing (212); The end cap (22) includes a protrusion (26) that protrudes toward the side of the end cap (22) away from the electrode assembly (25). The protrusion (26) is spaced apart from the electrode terminal (23). The protrusion (26) includes a third protrusion (261) and a fourth protrusion (262). The third protrusion (261) is electrically connected to the third electrode terminal (231), and the fourth protrusion (262) is electrically connected to the fourth electrode terminal (232). The third protrusion (261) and the fourth protrusion (262) are used to form an electrical connection with the voltage acquisition device (40).

11. The battery cell according to claim 10, characterized in that, The third protrusion (261) and the third electrode terminal (231) are electrically connected via a conductive element; and / or The fourth protrusion (262) and the fourth electrode terminal (232) are electrically connected by a conductive element.

12. An electrical appliance, characterized in that, include: The battery device according to any one of claims 1 to 9; or The battery cell according to claim 10 or 11.

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