A battery system and an electric device

Abstract

The application discloses a battery system and a power utilization device. The battery system comprises a plurality of battery monomers, a sampling circuit board and a battery cell sampling circuit. Each battery monomer comprises a pressure relief mechanism. The sampling circuit board is located on one side of at least part of the battery monomers having the pressure relief mechanism. The battery cell sampling circuit is connected with the sampling circuit board. The battery cell sampling circuit comprises a plurality of functional circuit partitions. The plurality of functional circuit partitions are arranged in an area avoiding the pressure relief mechanism of at least part of the battery monomers. Thus, the battery cell sampling circuit is connected with the sampling circuit board, so that the battery cell sampling circuit can collect the state information of the battery monomers through the sampling circuit board. Meanwhile, the internal space of the battery system can be saved. The plurality of functional circuit partitions are arranged in the area avoiding the pressure relief mechanism of at least part of the battery monomers, so that the influence of the battery cell sampling circuit on the pressure release of the battery monomers due to the shielding of the pressure relief mechanism can be reduced, and the risk of thermal runaway caused by the damage of the battery cell sampling circuit due to the pressure release of the battery monomers can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery system and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to sustainable development, which in turn promotes the adjustment of the energy structure and drives the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology. Due to its advantages such as high energy density, good cycle capability, high operating voltage, environmental friendliness, and low self-discharge, it has been widely used in portable electronics, electric vehicles, and energy storage systems.

[0003] In a battery system, the state information of individual battery cells can be collected through a cell sampling circuit. However, the existing cell sampling circuits placed in the battery system may block the pressure relief mechanism of the individual battery cells, thereby affecting the performance of the battery cells or pressure release due to the blocked pressure relief mechanism. Utility Model Content

[0004] The main objective of this application is to provide a battery system and an electrical device that aims to solve the technical problem in the prior art where the arrangement of the cell sampling circuit in the battery system would block the pressure relief mechanism of the individual battery cells.

[0005] To address the aforementioned problems, this application provides a battery system comprising multiple battery cells, a sampling circuit board, and a cell sampling circuit. Each battery cell includes a pressure relief mechanism. The sampling circuit board is located on the side of at least some battery cells where the pressure relief mechanism is located. The cell sampling circuit is connected to the sampling circuit board and includes multiple functional circuit partitions positioned in an area that avoids the pressure relief mechanism of at least some battery cells. Therefore, with the sampling circuit board located on the side of at least some battery cells where the pressure relief mechanism is located, and the cell sampling circuit connected to the sampling circuit board, it is convenient for the cell sampling circuit to collect battery cell status information through the sampling circuit board. This also saves internal space in the battery system. Furthermore, the multiple functional circuit partitions positioned in an area that avoids the pressure relief mechanism of at least some battery cells reduce the impact of the cell sampling circuit blocking the pressure relief mechanism on the pressure release of the battery cells and mitigate the risk of thermal runaway caused by damage to the cell sampling circuit due to pressure release of the battery cells.

[0006] In some embodiments, the cell sampling circuit includes multiple separately arranged circuit carriers, each circuit carrier having at least one functional circuit partition, and each circuit carrier being connected to a sampling circuit board. Thus, the separate arrangement of the multiple circuit carriers, with each circuit carrier having at least one functional circuit partition, facilitates the placement of the multiple functional circuit partitions in areas that avoid the pressure relief mechanism of each individual battery cell, further reducing the impact of the cell sampling circuit blocking the pressure relief mechanism on the pressure release of the individual battery cells.

[0007] In some embodiments, each functional circuit partition includes a plurality of electronic components, wherein the height difference between at least some of the electronic components in the same functional circuit partition is set to be less than a preset height threshold. Therefore, setting the height difference between at least some of the electronic components in the same functional circuit partition to be less than the preset height threshold can mitigate the large stress tension caused by the large height difference of the electronic components after applying the protective layer, thereby improving the reliability and service life of the battery cell sampling circuit.

[0008] In some embodiments, the height difference between at least some electronic components within the same functional circuit partition is greater than or equal to 0 and less than or equal to 2 mm. Therefore, this height difference between at least some electronic components within the same functional circuit partition is greater than or equal to 0 and less than or equal to 2 mm, which helps to mitigate the large stress tension caused by significant height differences between electronic components after applying the protective layer.

[0009] In some embodiments, the plurality of functional circuit partitions include a first circuit partition, which includes a sampling main chip and a filter capacitor circuit. Thus, the first circuit partition, including the sampling main chip and the filter capacitor circuit, can improve the stability of the sampling main chip during sampling through the filter capacitor circuit. Furthermore, arranging the sampling main chip and the filter capacitor circuit, which have a small height difference, in the same functional circuit partition can mitigate the significant stress and tension caused by large height differences in electronic components after applying the protective layer.

[0010] In some embodiments, the multiple functional circuit partitions include a second circuit partition, which includes an equalization resistor circuit and a filter resistor circuit. Thus, the second circuit partition, including the equalization resistor circuit and the filter resistor circuit, can equalize the sampling voltage through the equalization resistor circuit and improve the stability during sampling through the filter resistor circuit. Furthermore, arranging the equalization resistor circuit and the filter resistor circuit, which have a small height difference, in the same functional circuit partition can mitigate the significant stress and tension caused by large height differences in electronic components after applying the protective layer.

[0011] In some embodiments, the multiple functional circuit partitions include a third circuit partition, which includes a Zener diode circuit and a power supply filter capacitor circuit. Thus, the third circuit partition, including the Zener diode circuit and the power supply filter capacitor circuit, can maintain the stability of the power supply to the battery cell sampling circuit. Furthermore, arranging the Zener diode circuit and the power supply filter capacitor circuit, which have a small height difference, in the same functional circuit partition can mitigate the significant stress and tension caused by the large height difference of electronic components after applying the protective layer.

[0012] In some embodiments, the cell sampling circuit includes a communication circuit, which comprises a transformer region and a capacitor region. The transformer region includes an inductor circuit, and the capacitor region includes a capacitor circuit. The transformer region and the capacitor region are located in different functional circuit partitions. Therefore, while maintaining the communication function of the cell sampling circuit, it also mitigates the significant stress and tension caused by the large height difference between electronic components after applying the protective layer.

[0013] In some embodiments, the multiple functional circuit partitions include a power supply circuit partition, which includes an adjustment transistor circuit and a feedback resistor circuit. Thus, the power supply circuit partition, including the adjustment transistor circuit and the feedback resistor circuit, can maintain the stability of the power supply to the cell sampling circuit. Furthermore, arranging the adjustment transistor circuit and the feedback resistor circuit, which have a small height difference, in the same functional circuit partition can mitigate the significant stress and tension caused by the large height difference of electronic components after applying the protective layer.

[0014] In some embodiments, the cell sampling circuit includes a first type of element and a plurality of second type elements. The heat dissipation power of the first type of element is less than that of the second type of element, and different types of second type elements are located in different functional circuit partitions. Thus, the heat dissipation power of the first type of element is less than that of the second type of element, and different types of second type elements are located in different functional circuit partitions, thereby arranging the second type of elements with higher heat dissipation in different functional circuit partitions and mitigating the risk of affecting the lifespan of electronic components due to the concentration of heat-generating devices.

[0015] In some embodiments, the second type of components includes a sampling main chip, an equalization resistor circuit, and an adjustment transistor circuit, which are located in different functional circuit partitions. Therefore, by having the sampling main chip, equalization resistor circuit, and adjustment transistor circuit located in different functional circuit partitions, the risk of reduced lifespan due to the concentration of these components can be mitigated.

[0016] In some embodiments, the cell sampling circuit includes a heat-conducting component, which is connected to both the sampling circuit board and a functional circuit partition containing the second type of components, and / or the heat-conducting component is connected to the individual battery cells and the sampling circuit board corresponding to the functional circuit partition containing the second type of components. Therefore, by connecting the sampling circuit board and the functional circuit partition containing the second type of components, and / or by connecting the individual battery cells and the sampling circuit board corresponding to the functional circuit partition containing the second type of components, the heat generated by the second type of components is easily conducted out of the corresponding functional circuit partition, improving the heat dissipation performance of the cell sampling circuit.

[0017] In some embodiments, the battery system includes a protective layer coated on at least a portion of the multiple functional circuit partitions. Thus, the protective layer coating on at least a portion of the multiple functional circuit partitions provides better protection for the functional circuit partitions, thereby improving the lifespan of the cell sampling circuit.

[0018] In some embodiments, the battery system includes multiple reinforcing plates connected to the side of the sampling circuit board away from the functional circuit partitions. Each reinforcing plate is correspondingly disposed with at least one functional circuit partition in the thickness direction of the sampling circuit board. This arrangement, where each reinforcing plate corresponds with at least one functional circuit partition in the thickness direction of the sampling circuit board, allows the reinforcing plates to avoid the pressure relief mechanisms of individual battery cells. Simultaneously, the regionalized reinforcing plates can mitigate the risk of excessive deformation stress.

[0019] In some embodiments, the cell sampling circuit is located between the sampling circuit board and the battery cell; or, the sampling circuit board is located between the cell sampling circuit and the battery cell. Therefore, placing the cell sampling circuit between the sampling circuit board and the battery cell provides better protection for the circuit, extending its lifespan. Furthermore, placing the sampling circuit board between the cell sampling circuit and the battery cell facilitates its placement on the circuit board, improving production efficiency.

[0020] In some embodiments, multiple battery cells are divided into at least one battery group. Each battery cell includes an end wall portion, a pressure relief mechanism is located on the end wall portion, and the sampling circuit board, the cell sampling circuit, and multiple end walls of the same battery group are located on the same side or different sides of the battery group. Therefore, having the sampling circuit board, the cell sampling circuit, and multiple end walls of the same battery group located on the same side or different sides of the battery group facilitates the partitioning of multiple functional circuits in an area that avoids the pressure relief mechanism of each battery cell. This reduces the impact of the cell sampling circuit blocking the pressure relief mechanism on the pressure release of the battery cells and mitigates the risk of thermal runaway caused by damage to the cell sampling circuit due to pressure release of the battery cells.

[0021] In some embodiments, the number of cell sampling circuits is at least two, and the at least two cell sampling circuits are spaced apart on a sampling circuit board, communicating with each other via a connector or the sampling circuit board. Thus, by providing at least two cell sampling circuits on the sampling circuit board, and by having the at least two cell sampling circuits communicate with each other via a connector or the sampling circuit board, it is possible to collect status information from a greater number of individual battery cells.

[0022] In some embodiments, at least two sampling circuit boards are used, spaced apart. Each sampling circuit board is equipped with a cell sampling circuit, and the cell sampling circuits on different sampling circuit boards communicate with each other via connectors. Thus, each sampling circuit board is equipped with a cell sampling circuit, and the cell sampling circuits on different sampling circuit boards communicate with each other via connectors, facilitating the collection of status information from a greater number of battery cells.

[0023] In some embodiments, multiple battery cells are divided into at least two battery groups, which are arranged adjacent to each other. The sampling circuit board includes a first board portion, a second board portion, and a third board portion. The first board portion is located in one battery group, the third board portion is located in another adjacent battery group, and the second board portion is connected between the first board portion and the second board portion. At least one of the first board portion, the second board portion, and the third board portion is provided with a cell sampling circuit. Thus, with the first board portion located in one battery group, the third board portion located in another adjacent battery group, and the second board portion connected between the first board portion and the second board portion, it is convenient to collect status information of a larger number of battery cells, while also improving the flexibility of the cell sampling circuit layout.

[0024] To address the aforementioned problems, this application provides an electrical device that includes the aforementioned battery system. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a vehicle according to one or more embodiments of this application; Figure 2 This is a first structural schematic diagram of a battery system according to one or more embodiments of this application; Figure 3 This is a second structural schematic diagram of a battery system according to one or more embodiments of this application; Figure 4 This is a third structural schematic diagram of a battery system according to one or more embodiments of this application; Figure 5 This is a fourth structural schematic diagram of a battery system according to one or more embodiments of this application; Figure 6 This is a fifth structural schematic diagram of a battery system according to one or more embodiments of this application; Figure 7 This is a sixth structural schematic diagram of a battery system according to one or more embodiments of this application; Figure 8 This is a seventh structural schematic diagram of a battery system according to one or more embodiments of this application; Figure 9 This is an eighth structural schematic diagram of a battery system according to one or more embodiments of this application; Figure 10 This is a ninth structural schematic diagram of a battery system according to one or more embodiments of this application; Figure 11 This is a schematic diagram of a cell sampling circuit according to one or more embodiments of this application; Figure 12 This is a tenth structural schematic diagram of a battery system according to one or more embodiments of this application; Figure 13 This is an eleventh structural schematic diagram of a battery system according to one or more embodiments of this application.

[0027] Reference numerals: Vehicle 1; Battery system 2; Controller 3; Motor 4; Battery cell 100; pressure relief mechanism 110; battery group 101; end wall portion 120; Sampling circuit board 200; first board body 210; second board body 220; third board body 230; Cell sampling circuit 300; circuit carrier 301; functional circuit partition 310; electronic component 311; first type component 3111; second type component 3112; heat-conducting component 320; first circuit partition 330; sampling main chip 331; filter capacitor circuit 332; second circuit partition 340; filter resistor circuit 341; equalizing resistor circuit 342; third circuit partition 350; power supply filter capacitor circuit 351; Zener diode circuit 352; communication circuit 360; transformer area 361; resistor-capacitor area 362; power supply circuit partition 370; regulating diode circuit 371; feedback resistor circuit 372. Protective layer 400; reinforcing plate 500; connector 600. Detailed Implementation

[0028] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0030] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0031] In this document, the term "embodiment" means that a particular 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 separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0033] In the description of the embodiments of this application, the term "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).

[0034] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0035] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0036] Energy conservation and emission reduction are key to sustainable development, which in turn promotes the adjustment of the energy structure and drives the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology. Due to its advantages such as high energy density, good cycle capability, high operating voltage, environmental friendliness, and low self-discharge, it has been widely used in portable electronics, electric vehicles, and energy storage systems.

[0037] In a battery system, the state information of individual battery cells can be collected through a cell sampling circuit. In some embodiments, the cell sampling circuit is arranged in the battery system and may block the pressure relief mechanism of the individual battery cells, thereby affecting the performance of the individual battery cells or the pressure release of the blocked pressure relief mechanism.

[0038] To address the technical problems existing in related technologies, this application provides an electrical device and a battery system. The battery system includes multiple battery cells, a sampling circuit board, and a cell sampling circuit. The sampling circuit board is disposed on multiple battery cells, and the cell sampling circuit is connected to the sampling circuit board. The cell sampling circuit includes multiple functional circuit partitions, which are disposed in areas that avoid the pressure relief mechanism of each battery cell. This reduces the impact of the cell sampling circuit on the pressure release of the battery cells due to obstruction of the pressure relief mechanism, and mitigates the risk of thermal runaway caused by damage to the cell sampling circuit due to pressure release of the battery cells.

[0039] Specifically, this application provides an electrical device, which may include, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys may include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc. The electrical device may include a battery system, which can provide electrical energy to achieve its corresponding functions.

[0040] This application also provides an electric vehicle that may include a battery system.

[0041] Please refer to Figure 1 , Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments of this application.

[0042] Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery system 2 is installed inside vehicle 1, and the battery system 2 can be located at the bottom, front, or rear of vehicle 1. The battery system 2 can be used to power vehicle 1; for example, the battery system 2 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery system 2 to supply power to the motor 4, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0043] In some embodiments of this application, the battery system 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0044] To improve the performance of electrical devices, this application also provides a battery system, see [link to relevant documentation]. Figure 2 , Figure 2 This is a first structural schematic diagram of a battery system according to one or more embodiments of this application.

[0045] The battery system 2 includes multiple battery cells 100, a sampling circuit board 200, and a cell sampling circuit 300. Each battery cell 100 includes a pressure relief mechanism 110. The sampling circuit board 200 is located on the side of at least a portion of the battery cells 100 where the pressure relief mechanism 110 is located. The cell sampling circuit 300 is connected to the sampling circuit board 200. The cell sampling circuit 300 includes multiple functional circuit partitions 310, which are located in areas that avoid the pressure relief mechanism 110 of at least a portion of the battery cells 100.

[0046] The battery cell 100 can include, but is not limited to, prismatic cells, cylindrical cells, blade cells, etc. There can be multiple battery cells 100, which can be connected in series, parallel, or a combination thereof. A combination of series and parallel connections means that multiple battery cells 100 are connected in both series and parallel configurations. Multiple battery cells 100 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple battery cells 100 is housed within the casing of the battery system 2. Alternatively, the battery system 2 can also consist of multiple battery cells 100 first connected in series, parallel, or a combination thereof to form battery modules, and then these modules are connected in series, parallel, or a combination thereof to form a whole, which is then housed within the casing of the battery system 2. The battery system 2 can also include other structures; for example, it can include a busbar component for electrical connection between the multiple battery cells 100. The battery cells 100 can be manufactured using either a stacked or wound method, meaning that battery cells 100 are classified as either stacked or wound batteries. Stacked batteries offer uniform current collection, low internal resistance, and high specific power. However, achieving high precision requires extremely precise molds, resulting in high equipment investment, complex processes, and low production efficiency. Wound batteries, on the other hand, are simpler to manufacture, with less stringent precision requirements for equipment during sheet fabrication and assembly. They offer high production efficiency and lower costs. In terms of performance, wound batteries boast excellent high and low temperature performance, very rapid charging, ultra-long lifespan, stable high output voltage, and a robust, shock-resistant structure.

[0047] A battery cell 100 refers to the smallest unit constituting the battery system 2. The battery cell 100 may include a casing, electrode assemblies, and other functional components. The casing includes an end cap and a housing. The end cap is a component that closes onto the opening of the housing to isolate the internal environment of the battery cell 100 from the external environment. The shape of the end cap may be adapted to the shape of the housing to fit the housing. Optionally, the end cap may be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap is not easily deformed under pressure or impact, giving the battery cell 100 higher structural strength and improved safety performance. Functional components such as electrode terminals may be provided on the end cap. The electrode terminals can be used for electrical connection with the electrode assemblies to output or input electrical energy into the battery cell 100. In some embodiments, the electrode terminals may include terminals, which may include positive and negative terminals for current output and connection to external circuits. The end cap can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap. The insulating element can be used to isolate the electrical connection components within the housing from the end cap to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0048] The housing is a component used to cooperate with the end cap to form the internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate electrode components, electrolyte, and other components. The housing and end cap can be independent components, and an opening can be provided on the housing. The end cap closes the opening to form the internal environment of the battery cell 100. Alternatively, the end cap and housing can be integrated. Specifically, the end cap and housing can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing, the end cap closes the housing. The housing can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode components. The material of the housing can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0049] In some embodiments, the end cap may also be provided with a pressure relief mechanism 110 for releasing internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold. As an example, the internal pressure or temperature of the battery cell 100 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 100 reaches the predetermined threshold, the pressure relief mechanism 110 actuates or a weak structure provided in the pressure relief mechanism 110 is destroyed, thereby forming an opening or channel for releasing internal pressure or temperature. This threshold design varies depending on 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 100.

[0050] The sampling circuit board 200 may include, but is not limited to, a printed circuit board (PCB), a flexible printed circuit board (FPC), or a rigid-flex board. The sampling circuit board 200 may be fixed to multiple battery cells 100. The sampling circuit board 200 may be fixed to the side of the battery cell 100 with electrode terminals, so that the sampling circuit board 200 is electrically connected to the battery cell 100 through the electrode terminals. The sampling circuit board 200 may avoid at least part of the pressure relief mechanism 110 of the battery cell 100; for example, the sampling circuit board 200 may be partially located on the side of the battery cell 100 without the pressure relief mechanism 110, and partially located on the side of the battery cell 100 with the pressure relief mechanism 110. Or as... Figure 2As shown, the sampling circuit board 200 can be entirely located on the side of the battery cell 100 with the pressure relief mechanism 110. The sampling circuit board 200 can have through holes similar to those of the pressure relief mechanism 110. When the sampling circuit board 200 is located on the side of the battery cell 100 with the pressure relief mechanism 110, the through holes of the sampling circuit board 200 correspond to the pressure relief mechanism 110, thereby reducing the impact of the sampling circuit board 200 on the pressure relief mechanism 110. Alternatively, the sampling circuit board 200 can be a flexible circuit board. The flexible circuit board can be configured to at least partially obscure the pressure relief mechanism 110. For example, the wiring portion of the flexible circuit board can avoid the pressure relief mechanism 110. Simultaneously, the flexible circuit board has characteristics such as being thin, light, and easily torn, so that obscuring the pressure relief mechanism 110 by the flexible circuit board will not significantly affect the pressure relief function of the pressure relief mechanism 110.

[0051] The cell sampling circuit 300 may include, but is not limited to, a cell monitoring circuit (CMC). In related technologies, the battery management system of battery system 2 is generally located within the battery pack and occupies a certain amount of installation space and wiring harness insertion / removal space. Since the battery management system is an electrical component susceptible to impact damage and requires sufficient electrical separation from other electrical components within battery system 2, it is typically equipped with a casing for collision protection and electrical isolation. This, to some extent, affects the energy density of battery system 2. In this embodiment, the cell sampling circuit 300, which involves numerous wiring harnesses and connectors, is directly mounted on the sampling circuit board 200. This saves on the casing structure of the cell sampling circuit 300, the connectors between the sampling circuit board 200 and the battery monitoring unit, and also saves on the installation space and wiring harness insertion / removal space of the battery monitoring unit in the high-voltage wiring compartment of battery system 2. Changing the battery monitoring unit from the original integrated circuit board architecture to an architecture directly mounted on the sampling circuit board 200 of the battery cell 100 saves more internal space within the battery pack, thereby increasing the energy density of battery system 2. The cell sampling circuit 300 in the relevant embodiment is set on the sampling circuit board 200, which may block the pressure relief mechanism 110 of the battery cell 100, thereby affecting the performance or pressure release of the battery cell 100 whose pressure relief mechanism 110 is blocked.

[0052] In this embodiment, the cell sampling circuit 300 includes multiple functional circuit partitions 310. The functions of each functional circuit partition 310 may be the same or different. For example, the multiple functional circuit partitions 310 may include, but are not limited to, sampling partitions, power supply partitions, filtering partitions, and communication partitions. The multiple functional circuit partitions 310 may be directly connected, or some functional circuit partitions 310 may be directly connected, while some functional circuit partitions 310 may be indirectly connected through the sampling circuit board 200. Each functional circuit partition 310 has at least one electronic component, which may include, but is not limited to, resistors, capacitors, inductors, transistors, etc. The fact that the functional circuit partition 310 is located in the area that avoids the pressure relief mechanism 110 of at least part of the battery cell 100 can be understood as meaning that the orthographic projection of the functional circuit partition 310 on the side of the battery cell 100 with the pressure relief mechanism 110 does not coincide with the pressure relief mechanism 110. For example, the functional circuit partition 310 may be located on the side of the battery cell 100 with the pressure relief mechanism 110, and located to the side of the pressure relief mechanism 110. Alternatively, the cell sampling circuit 300 may have a through hole corresponding to the pressure relief mechanism 110, and the remaining part may be set as a functional circuit partition 310. When the cell sampling circuit 300 is set on the sampling circuit board 200, the through hole of the cell sampling circuit 300 corresponds to the pressure relief mechanism 110 of the battery cell 100, and the part set as a functional circuit partition 310 corresponds to the position of the battery cell 100 where the pressure relief mechanism 110 is not set, so that multiple functional circuit partitions 310 can avoid the pressure relief mechanism 110 of each battery cell 100.

[0053] In the above-described embodiments, the sampling circuit board 200 is located on the side of at least a portion of the battery cells 100 where the pressure relief mechanism 110 is located. The cell sampling circuit 300 is connected to the sampling circuit board 200, which facilitates the cell sampling circuit 300 to collect the status information of the battery cells 100 through the sampling circuit board 200. At the same time, it can also save internal space of the battery system 2. Furthermore, the cell sampling circuit 300 includes multiple functional circuit partitions 310, which are located in areas that avoid the pressure relief mechanism 110 of at least a portion of the battery cells 100. This can reduce the impact of the cell sampling circuit 300 on the pressure release of the battery cells 100 due to blocking the pressure relief mechanism 110, and improve the risk of thermal runaway caused by the damage to the cell sampling circuit 300 due to the pressure release of the battery cells 100.

[0054] Furthermore, the cell sampling circuit 300 includes multiple separately arranged circuit carrier sections 301, each circuit carrier section 301 having at least one functional circuit partition 310, and each circuit carrier section 301 being connected to the sampling circuit board 200. For example... Figure 2As shown, the cell sampling circuit 300 is located on the side of the battery cell 100 with the pressure relief mechanism 110. Each circuit carrier 301 is located in the area of ​​the battery cell 100 that avoids the pressure relief mechanism 110 of each battery cell 100. Correspondingly, each functional circuit partition 310 is also located in the area of ​​the battery cell 100 that avoids the pressure relief mechanism 110 of each battery cell 100. Multiple functional circuit partitions 310 can all be electrically connected to the sampling circuit board 200, thereby connecting the multiple functional circuit partitions 310 through the sampling circuit board 200. Thus, the multiple circuit carriers 301 are separately arranged, and each circuit carrier 301 is provided with at least one functional circuit partition 310. This makes it easier to place multiple functional circuit partitions 310 in the area that avoids the pressure relief mechanism 110 of each battery cell 100, further reducing the impact of the cell sampling circuit 300 blocking the pressure relief mechanism 110 on the pressure release of the battery cell 100. In some other embodiments, the cell sampling circuit 300 may further include a connection portion located between two functional circuit partitions 310. The connection portion is used to connect two adjacent circuit carrier portions 301, and is disposed in the area that avoids the pressure relief mechanism 110 of each battery cell 100. Figure 2 As shown, multiple circuit carriers 301 can be spaced apart in the direction in which the battery cells 100 are arranged, and the connecting part can extend along the direction in which the battery cells 100 are arranged and connect two adjacent circuit carriers 301. The connecting part can also be spaced apart from the pressure relief mechanism 110 of the battery cells 100 in the direction perpendicular to the arrangement of the battery cells 100.

[0055] In some embodiments, the sampling circuit board 200 is located between the cell sampling circuit 300 and the battery cell 100, such as Figure 2 As shown, the multiple functional circuit partitions 310 of the cell sampling circuit 300 can be set on the side of the sampling circuit board 200 away from the battery cell 100, which makes it easier to arrange the cell sampling circuit 300 on the sampling circuit board 200 and improve production efficiency, etc.

[0056] See Figure 3 , Figure 3 This is a second structural schematic diagram of a battery system according to one or more embodiments of this application.

[0057] The cell sampling circuit 300 is located between the sampling circuit board 200 and the battery cell 100. For example... Figure 3As shown, the multiple functional circuit partitions 310 of the cell sampling circuit 300 can all be located on the side of the sampling circuit board 200 facing the battery cell 100, which can provide good protection for the cell sampling circuit 300 through the cooperation of the sampling circuit board 200 and the battery cell 100. In some other embodiments, the multiple functional circuit partitions 310 of the cell sampling circuit 300 may be partially located on the side of the sampling circuit board 200 away from the battery cell 100, and the remaining part may be located on the side of the sampling circuit board 200 facing the battery cell 100.

[0058] See Figures 1 to 4 , Figure 4 This is a third structural schematic diagram of a battery system according to one or more embodiments of this application.

[0059] Multiple battery cells 100 are divided into at least one battery group 101. Each battery cell 100 includes an end wall portion 120, a pressure relief mechanism 110 is located on the end wall portion 120, and the sampling circuit board 200, the cell sampling circuit 300, and multiple end walls 120 of the same battery group 101 are located on the same side or different sides of the battery group 101. Each battery group 101 includes multiple battery cells 100, which can be arranged sequentially in the same direction. For example, when the battery cell 100 is a prismatic cell, the multiple battery cells 100 can be arranged sequentially along the thickness direction of the battery cell 100 to form the battery group 101; when the battery cell 100 is a cylindrical cell, the multiple battery cells 100 can be arranged sequentially along the radial direction of the battery cell 100 to form the battery group 101. The end wall portion 120 of the battery cell 100 can be an end cap of the battery cell 100, and the end wall portion 120 of the battery cell 100 can simultaneously be provided with a pressure relief mechanism 110 and electrode terminals. Figure 2 and Figure 3 As shown, the pressure relief mechanism 110, sampling circuit board 200, cell sampling circuit 300, and multiple end walls 120 of the same battery group 101 are located on the same side of the battery group 101, which facilitates the electrical connection of the sampling circuit board 200 with the electrode terminals of the battery cell 100, thereby facilitating data acquisition from the battery cell 100. Figure 4As shown, the pressure relief mechanism 110, sampling circuit board 200, cell sampling circuit 300, and multiple end wall portions 120 of the same battery group 101 are located on different sides of the battery group 101. For example, the pressure relief mechanism 110 and the electrode terminals are located on the end wall portion 120 of the battery cell 100, while the sampling circuit board 200 and the cell sampling circuit 300 can be located on the side wall portion of the battery cell 100. This makes it easier to set multiple functional circuit partitions 310 in areas that avoid the pressure relief mechanism 110 of each battery cell 100, thereby reducing the impact of the cell sampling circuit 300 on the pressure release of the battery cell 100 due to blocking the pressure relief mechanism 110, and improving the risk of thermal runaway caused by the damage to the cell sampling circuit 300 due to the pressure release of the battery cell 100.

[0060] See Figure 5 , Figure 5 This is a fourth structural schematic diagram of a battery system according to one or more embodiments of this application.

[0061] The battery system 2 includes a protective layer 400, which is coated on at least some of the multiple functional circuit partitions 310. The protective layer 400 may include, but is not limited to, waterproof adhesive or conformal coating. The protective layer 400 can be applied to the side of the functional circuit partition 310 opposite to the sampling circuit board 200. The protective layer 400 provides protection against moisture, mold, and salt spray. Moisture protection prevents moisture and condensation from causing circuit corrosion, short circuits, and leakage. Mold protection prevents mold growth on the circuit board, as its metabolites can cause corrosion. Salt spray protection prevents salt-containing air from corroding the circuit board and components. The protective layer 400 can be applied to some of the multiple functional circuit partitions 310, or it can be applied to all of the functional circuit partitions 310. The protective layer 400 provides good protection for the functional circuit partitions 310, thus improving the service life of the cell sampling circuit 300.

[0062] See Figure 6 , Figure 6 This is a fifth structural schematic diagram of a battery system according to one or more embodiments of this application.

[0063] The battery system 2 includes multiple reinforcing plates 500. Each reinforcing plate 500 is connected to the side of the sampling circuit board 200 opposite to the functional circuit partition 310. Each reinforcing plate 500 and at least one functional circuit partition 310 are correspondingly arranged in the thickness direction of the sampling circuit board 200. The reinforcing plates 500 can be, but are not limited to, FR4 reinforcing plates, stainless steel reinforcing plates, aluminum plate reinforcing plates, metal reinforcing plates, beryllium copper reinforcing plates, polyimide reinforcing plates, etc. The thickness of the reinforcing plates 500 can be set according to actual conditions. For example, when the reinforcing plate 500 is an FR4 reinforcing plate, its thickness can be between 0.1mm and 1.6mm, such as 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.6mm, 0.8mm, 1.6mm, etc. When the reinforcing plate 500 is a polyimide reinforcing plate 500, the thickness of the reinforcing plate 500 can be between 0.025mm and 0.05mm, such as 0.025mm, 0.03mm, 0.035mm, 0.04mm, 0.045mm, or 0.05mm, etc. The reinforcing plate 500 is connected to the side of the sampling circuit board 200 opposite to the functional circuit partition 310, such as... Figure 6 As shown, multiple functional circuit partitions 310 are located on the side of the sampling circuit board 200 away from the battery cell 100, and reinforcing plates 500 are located on the side of the sampling circuit board 200 facing the battery cell 100. Each functional circuit partition 310 is correspondingly provided with a reinforcing plate 500. For example, the functional circuit partitions 310 and reinforcing plates 500 are in a one-to-one correspondence, so that the reinforcing plates 500 avoid the pressure relief mechanism 110 of the battery cell 100. At the same time, the regional reinforcing plates 500 can also improve the risk of excessive deformation stress. In some other embodiments, some of the multiple functional circuit partitions 310 and some of the multiple reinforcing plates 500 may be located on the side of the sampling circuit board 200 facing the battery cell 100, while the remaining functional circuit partitions 310 and the remaining reinforcing plates 500 may be located on the side of the sampling circuit board 200 away from the battery cell 100.

[0064] See Figure 7 , Figure 7 This is a sixth structural schematic diagram of a battery system according to one or more embodiments of this application.

[0065] The number of cell sampling circuits 300 is at least two, and the at least two cell sampling circuits 300 are spaced apart on the sampling circuit board 200. The at least two cell sampling circuits 300 communicate with each other through the connector 600 or the sampling circuit board 200. The number of cell sampling circuits 300 can be set according to the actual situation. For example, the number of cell sampling circuits 300 can be two, three, four or other numbers. Multiple cell sampling circuits 300 are located on the same sampling circuit board 200. Each cell sampling circuit 300 can collect the status information of a specific number of battery cells 100. At least two cell sampling circuits 300 can be set on the same sampling circuit board 200. Each cell sampling circuit 300 includes multiple functional circuit partitions 310. Each cell sampling circuit 300 is electrically connected to the sampling circuit board 200. The at least two cell sampling circuits 300 can communicate with each other through the sampling circuit board 200. Alternatively, the cell sampling circuit 300 may have pads, and the connector 600 may be connected to the pads of two cell sampling circuits 300 respectively, thereby enabling the two cell sampling circuits 300 to communicate in a daisy chain. The connector 600 may include, but is not limited to, twisted pair or parallel wire. Thus, by setting at least two cell sampling circuits 300 on the sampling circuit board 200, and having at least two cell sampling circuits 300 communicate with each other through the connector 600 or the sampling circuit board 200, it is possible to collect status information of a greater number of battery cells 100.

[0066] See Figure 8 , Figure 8 This is a seventh structural schematic diagram of a battery system according to one or more embodiments of this application.

[0067] The number of sampling circuit boards 200 is at least two, and the at least two sampling circuit boards 200 are arranged at intervals. Each sampling circuit board 200 is provided with a cell sampling circuit 300, and the cell sampling circuits 300 on different sampling circuit boards 200 communicate through connectors 600. The number of sampling circuit boards 200 can be set according to the actual situation. For example, the number of sampling circuit boards 200 can be two, three, four, or other numbers. Multiple sampling circuit boards 200 can be the same or different. For example, some sampling circuit boards 200 can be flexible circuit boards, some sampling circuit boards 200 can be printed circuit boards, or multiple sampling circuit boards 200 can all be flexible circuit boards, or multiple sampling circuit boards 200 can all be printed circuit boards. In some application scenarios, multiple battery cells 100 can be arranged in at least one column, and at least two sampling circuit boards 200 can be arranged at intervals in the direction of the multiple battery cells 100 in the same column. Alternatively, multiple battery cells 100 can be arranged in multiple columns. When the battery cells 100 are arranged in multiple columns, each battery cell 100 in the same column can be provided with at least two sampling circuit boards 200, and battery cells 100 in different columns can also be provided with at least two circuit boards. Each sampling circuit board 200 can be provided with pads, and connectors 600 are respectively connected to the pads of two sampling circuit boards 200, thereby enabling the cell sampling circuits 300 on different sampling circuit boards 200 to communicate through the connectors 600. The connectors 600 can be, but are not limited to, twisted-pair cables or parallel cables. Thus, the cell sampling circuits 300 on different sampling circuit boards 200 communicate through the connectors 600 to facilitate the collection of status information from a larger number of battery cells 100.

[0068] See Figure 9 , Figure 9 This is an eighth structural schematic diagram of a battery system according to one or more embodiments of this application.

[0069] Multiple battery cells 100 are divided into at least two battery groups 101, which are arranged adjacent to each other. A sampling circuit board 200 includes a first board portion 210, a second board portion 220, and a third board portion 230. The first board portion 210 is located in one battery group 101, the third board portion 230 is located in another adjacent battery group 101, and the second board portion 220 is connected between the first board portion 210 and the second board portion 220. At least one of the first board portion 210, the second board portion 220, and the third board portion 230 is provided with a cell sampling circuit 300. The number of battery groups 101 can be set according to actual conditions; for example, the number of battery groups 101 can be two, three, four, or other numbers. Each battery group 101 can include multiple battery cells 100, and the multiple battery cells 100 in the same group can be arranged sequentially in the same direction. The sampling circuit board 200 can be a flexible circuit board. It may include a first board portion 210, a second board portion 220, and a third board portion 230 connected sequentially. The first board portion 210 is located in one of the battery groups 101 and extends along the direction in which the multiple battery cells 100 in that battery group 101 are arranged. The third board portion 230 is located in an adjacent battery group 101 and extends along the direction in which the multiple battery cells 100 in that battery group 101 are arranged. The second board portion 220 is connected to both the first board portion 210 and the second board portion 220. The third board portion 230 may be located on the side of two adjacent battery groups 101. The cell sampling circuit 300 can be disposed in the first board portion 210, the second board portion 220, or the third board portion 230, facilitating the collection of status information from a larger number of battery cells 100 and improving the flexibility of the cell sampling circuit 300's arrangement. In some embodiments, each battery group 101 may be provided with other sampling circuit boards 200. The sampling circuit boards 200 located in the same battery group 101 as the first board body portion 210 may be spaced apart from the first board body portion 210 and communicate with each other through the connector 600. The sampling circuit boards 200 located in the same battery group 101 as the third board body portion 230 may be spaced apart from the third board body portion 230 and communicate with each other through the connector 600.

[0070] See Figure 10 and Figure 11 , Figure 10 This is a ninth structural schematic diagram of a battery system according to one or more embodiments of this application. Figure 11 This is a schematic diagram of a cell sampling circuit according to one or more embodiments of this application.

[0071] Each functional circuit partition 310 includes a plurality of electronic components 311, wherein the height difference between at least some of the electronic components 311 within the same functional circuit partition 310 is set to be less than a preset height threshold. The electronic components 311 may include, but are not limited to, resistors, capacitors, inductors, transistors, or chips. The preset height threshold may include, but is not limited to, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.4mm, 2.6mm, 2.8mm, 3.0mm, etc., and can be set according to actual conditions. The plurality of electronic components 311 can be allocated to different functional circuit partitions 310 according to actual conditions, as long as the height difference between at least some of the electronic components 311 within the same functional circuit partition 310 is set to be less than the preset height threshold. In some embodiments, the height difference between the tallest electronic component 311 and the shortest electronic component 311 in the same functional circuit partition 310 may be less than a preset height threshold. For example, multiple identical electronic components 311 may be provided in the same functional circuit partition 310, such as multiple resistors, multiple capacitors, or multiple transistors. In other embodiments, the height difference between only some electronic components 311 in the same functional circuit partition 310 may be set to be less than the preset height threshold. For example, the same functional circuit partition 310 may include a first component and a second component, where the number of first components is greater than the number of second components, and the height difference between the first and second components is greater than or equal to the preset height threshold. In practical scenarios, the spacing between a second component and any one of the first components may be set to be greater than the spacing between any two first components. In this embodiment, the height difference between at least some electronic components 311 in the same functional circuit partition 310 is set to be less than a preset height threshold, which can improve the large stress pulling caused by the large height difference of electronic components 311 after the protective layer 400 is coated, thereby improving the reliability and service life of the battery cell sampling circuit 300.

[0072] Furthermore, the height difference between at least some electronic components 311 in the same functional circuit partition 310 is greater than or equal to 0 and less than or equal to 2 mm. In some embodiments, the height difference between at least some electronic components 311 in the same functional circuit partition 310 may be between 0.8 mm and 1.2 mm, between 1 mm and 2 mm, between 0.8 mm and 1.1 mm, between 0.9 mm and 1.0 mm, between 0.8 mm and 0.9 mm, between 1 mm and 1.5 mm, between 1 mm and 1.4 mm, between 1.5 mm and 2 mm, between 1.2 mm and 1.5 mm, between 0 mm and 0.8 mm, between 0.1 mm and 0.8 mm, between 0.5 mm and 0.8 mm, between 0 mm and 0.5 mm, etc. The height difference between at least some electronic components 311 in the same functional circuit partition 310 includes, but is not limited to, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm, etc. This helps to mitigate the significant stress and tension caused by the large height difference of the electronic components 311 after applying the protective layer 400.

[0073] Furthermore, the multiple functional circuit partitions 310 include a first circuit partition 330, which includes a sampling main chip 331 and a filter capacitor circuit 332. The first circuit partition 330 can be a relatively central functional circuit partition 310 among the multiple functional circuit partitions 310. The first circuit partition 330 also includes the sampling main chip 331 and the filter capacitor circuit 332. The filter capacitor circuit 332 is connected to the sampling main chip 331. The filter capacitor circuit 332 can play a filtering role during the sampling process of the sampling main chip 331, so as to provide a stable external input for the sampling main chip 331 and improve the situation of sampling jump. The filter capacitor circuit 332 mainly includes filter capacitors, such as sampling filter capacitors and power supply filter capacitors. The sampling filter capacitors and power supply filter capacitors are set in parallel and are respectively connected to the sampling main chip 331. The sampling main chip 331 may include, but is not limited to, the AFE main chip. The height difference between the sampling main chip 331 and the filter capacitor circuit 332 is less than a preset height threshold, which can improve the large stress tension caused by the large height difference of electronic components 311 after the protective layer 400 is coated. In some embodiments, the filter capacitor circuit 332 may include a plurality of sampling filter capacitors and a plurality of power supply filter capacitors, with each sampling filter capacitor corresponding to a power supply filter capacitor.

[0074] Furthermore, the height difference between the sampling main chip 331 and the filter capacitor circuit 332 is between 0.8mm and 1.2mm. In some embodiments, the height difference between the sampling main chip 331 and the filter capacitor circuit 332 may be between 0.8mm and 1.1mm, between 0.8mm and 1.0mm, between 0.9mm and 1.1mm, between 0.9mm and 1.0mm, between 0.8mm and 0.9mm, etc. Alternatively, the height difference between the sampling main chip 331 and the filter capacitor circuit 332 may include, but is not limited to, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.0mm, 1.1mm, etc. Thus, the height difference between the sampling main chip 331 and the filter capacitor circuit 332 is between 0.8mm and 1.2mm, which helps to reduce the large stress tension caused by the large height difference of the electronic components 311 after the protective layer 400 is applied.

[0075] In some embodiments, the plurality of functional circuit partitions 310 include a second circuit partition 340, which includes an equalizing resistor circuit 342 and a filtering resistor circuit 341. The second circuit partition 340 can be arranged adjacent to the first circuit partition 330. The equalization resistor circuit 342 mainly includes equalization resistors, and the filter resistor circuit 341 mainly includes filter resistors. The equalization resistors and filter resistors can be connected in parallel. Both the filter resistor circuit 341 and the equalization resistor circuit 342 are connected to the first circuit partition 330. For example, both the equalization resistor circuit 342 and the filter resistor circuit 341 are connected to the sampling main chip 331 through the filter capacitor circuit 332. Specifically, the filter resistor can be connected to the sampling main chip 331 through the sampling filter capacitor, and the equalization resistor can be connected to the sampling main chip 331 through the power supply filter capacitor. The equalization resistor circuit 342 can equalize the sampling voltage, and the filter resistor circuit 341 can improve the stability during sampling. At the same time, arranging the equalization resistor circuit 342 and the filter resistor circuit 341 with small height differences in the same functional circuit partition 310 can improve the large stress stretching caused by the large height difference of the electronic components 311 after coating the protective layer 400. In some embodiments, the equalization resistor circuit 342 can include multiple equalization resistors, and the filter resistor circuit 341 can include multiple filter resistors, with each equalization resistor corresponding to one filter resistor.

[0076] In some embodiments, the multiple functional circuit partitions 310 include a third circuit partition 350, which includes a Zener diode circuit 352 and a power supply filter capacitor circuit 351. The third circuit partition 350 may be close to the second circuit partition 340. The Zener diode circuit 352 may mainly include transient voltage suppression diodes, and the power supply filter capacitor circuit 351 may mainly include a power supply filter capacitor. The transient voltage suppression diode and the power supply filter capacitor are connected in series. The transient voltage suppression diode can be connected to the power supply filter capacitor and the equalization resistor circuit 342 and the filter resistor circuit 341 of the second circuit partition 340. The other end of the transient voltage suppression diode can be connected to the electrode terminal of the battery cell 100. The Zener diode circuit 352 and the power supply filter capacitor can maintain the stability of the power supply to the cell sampling circuit 300. At the same time, arranging the Zener diode circuit 352 and the power supply filter capacitor circuit 351 with a small height difference in the same functional circuit partition 310 can improve the large stress tension caused by the large height difference of the electronic components 311 after the protective layer 400 is coated. In some embodiments, the Zener diode circuit 352 may include a plurality of transient voltage suppression diodes, and the power supply filter capacitor circuit 351 may include a plurality of power supply filter capacitors, with each transient voltage suppression diode corresponding to one power supply filter capacitor.

[0077] Furthermore, the height difference between the Zener diode circuit 352 and the power supply filter capacitor circuit 351 is between 1mm and 2mm. The height difference between the Zener diode circuit 352 and the power supply filter capacitor circuit 351 can be between 1mm and 1.8mm, between 1mm and 1.5mm, between 1mm and 1.4mm, between 1.5mm and 2mm, or between 1.2mm and 1.5mm, etc. Specifically, the height difference between the Zener diode circuit 352 and the power supply filter capacitor circuit 351 can be, but is not limited to, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm, which helps to mitigate the significant stress and tension caused by the large height difference of the electronic components 311 after applying the protective layer 400.

[0078] In some embodiments, the cell sampling circuit 300 includes a communication circuit 360, which includes a transformer region 361 and a capacitor region 362. The transformer region 361 includes an inductor circuit, and the capacitor region 362 includes a capacitor circuit. The transformer region 361 and the capacitor region 362 are located in different functional circuit partitions 310. The communication circuit 360 may include resistors, capacitors, and inductors, and may be located close to the first circuit partition 330. The transformer region 361 in the communication circuit 360 can be connected to the sampling main chip 331 via the capacitor region. The transformer region 361 and the capacitor region 362 being located in different functional circuit partitions 310 maintain the communication function of the cell sampling circuit 300 while also mitigating the significant stress caused by the large height difference of the electronic components 311 after coating the protective layer 400. In other embodiments, the transformer region 361 and the capacitor region 362 of the communication circuit 360 may be jointly located in one functional circuit partition 310, depending on the specific circumstances.

[0079] In some embodiments, the multiple functional circuit partitions 310 include a power supply circuit partition 370, which includes an adjustment transistor circuit 371 and a feedback resistor circuit 372. The adjustment transistor circuit 371 may include a transistor, and the feedback resistor circuit 372 may mainly include a feedback resistor. The feedback resistor may be connected in series with the transistor, and the other end of the transistor may be connected to the sampling main chip 331. The other end of the feedback resistor may be connected to the electrode terminal of the battery cell 100. This can maintain the stability of the power supply to the cell sampling circuit 300. At the same time, arranging the adjustment transistor circuit 371 and the feedback resistor circuit 372, which have a small height difference, in the same functional circuit partition 310 can improve the large stress stretching caused by the large height difference of the electronic components 311 after the protective layer 400 is coated.

[0080] In some embodiments, the cell sampling circuit 300 includes a first type of element 3111 and a plurality of second type elements 3112. The heat dissipation power of the first type of element 3111 is less than that of the second type of element 3112. Different types of second type elements 3112 are located in different functional circuit partitions 310. The second type of element 3112 can be a power heat-generating device, and the first type of element 3111 can be a low-heat non-power heat-generating device. The types of second type elements 3112 can include, but are not limited to, resistors, capacitors, inductors, transistors, or chips. The different types of second type elements 3112 are located in different functional circuit partitions 310 to arrange the second type of elements 3112 with higher heat dissipation in different functional circuit partitions 310, thereby mitigating the risk of affecting the lifespan of electronic components 311 due to the concentration of heat-generating devices. Alternatively, different types of first type elements 3111 and second type elements 3112 may be located in the same functional circuit partition 310, or multiple second type elements 3112 of the same type may be located in the same functional circuit partition 310.

[0081] Furthermore, the second type of component 3112 includes a sampling main chip 331, an equalization resistor circuit 342, and an adjustment transistor circuit 371, which are located in different functional circuit partitions 310. For example... Figure 10 and 11 As shown, the sampling main chip 331, the equalizing resistor circuit 342, and the adjustment tube circuit 371 can all be defined as second-class components 3112. The sampling main chip 331 is located in the first circuit partition 330, the adjustment tube circuit 371 is located in the power supply circuit partition 370, and the equalizing resistor circuit 342 is located in the second circuit partition 340. This can improve the risk of affecting the service life due to the concentration of the sampling main chip 331, the equalizing resistor circuit 342, and the adjustment tube circuit 371.

[0082] In the first circuit partition 330, a filter capacitor circuit 332 may also be provided. The filter capacitor circuit 332 mainly includes a filter capacitor. The heating power of the filter capacitor is less than the heating power of the sampling main chip 331. That is, the filter capacitor circuit 332 is a non-power heating device, while the sampling main chip 331 is a power heating device. The height difference between the filter capacitor and the sampling main chip 331 is less than a preset height threshold. In the second circuit partition 340, a filter resistor circuit 341 may also be provided. The filter resistor circuit 341 mainly includes a filter resistor. The heating power of the filter resistor is less than the heating power of the equalization resistor. That is, the filter resistor is a non-power heating device, while the equalization resistor is a power heating device. The height difference between the filter resistor and the equalization resistor is less than a preset height threshold. In other words, in some embodiments, the height difference of the electronic components 311 and the type of electronic components 311 can be considered simultaneously. On the basis of satisfying that the height difference is less than the preset height threshold, different types of second-class components 3112 can also be located in different functional circuit partitions 310.

[0083] See Figure 12 , Figure 12 This is a tenth structural schematic diagram of a battery system according to one or more embodiments of this application.

[0084] The battery cell sampling circuit 300 includes a heat-conducting component 320, which is connected to the sampling circuit board 200 and the functional circuit partition 310 equipped with a second type of element 3112. In this embodiment, the heat-conducting component 320 can be made of a material with high thermal conductivity. For example, the heat-conducting component 320 can be a metal heat-conducting component with high thermal conductivity, such as gold, silver, copper, aluminum, copper alloy, or aluminum alloy. In this embodiment, the functional circuit partition 310 equipped with the second type of element 3112 can be an encapsulated overall structure, and its heat-conducting component 320 can be connected to the outer surface of the functional circuit partition 310 and the sampling circuit board 200. Alternatively, the heat-conducting component 320 may also have good electrical conductivity. For example, the heat-conducting component 320 may be made of copper or gold. The heat-conducting component 320 may be laid on the pads of the functional circuit partition 310. The functional circuit partition 310 is connected to the sampling circuit board 200 through the heat-conducting component 320, which facilitates the conduction of the heat generated by the second type of component 3112 out of the functional circuit partition 310 corresponding to the second type of component 3112 through the heat-conducting component 320, thereby improving the heat dissipation performance of the cell sampling circuit 300.

[0085] See Figure 13 , Figure 13 This is an eleventh structural schematic diagram of a battery system 2 according to one or more embodiments of this application.

[0086] The cell sampling circuit 300 includes a heat-conducting component 320, which connects to the battery cell 100 and the sampling circuit board 200 respectively, corresponding to the functional circuit partition 310 where the second type of element 3112 is located. Specifically, the heat-conducting component 320 can be positioned in the thickness direction of the sampling circuit board 200 to correspond to the functional circuit partition 310 where the second type of element 3112 is located, thereby reducing the heat transfer distance between the functional circuit partition 310 and the heat-conducting component 320 and improving heat transfer efficiency. The heat-conducting component 320 can be embedded in the sampling circuit board 200, or it can be fixed to the outer surface of the sampling circuit board 200. At least a portion of the sampling circuit board 200 can contact the battery cell 100 through the heat-conducting component 320, facilitating the conduction of heat generated by the second type of element 3112 out of the functional circuit partition 310 corresponding to the second type of element 3112, thus improving the heat dissipation performance of the cell sampling circuit 300.

[0087] In summary, the sampling circuit board 200 is located on the side of at least some of the battery cells 100 where the pressure relief mechanism 110 is located. The cell sampling circuit 300 is connected to the sampling circuit board 200, which facilitates the cell sampling circuit 300 to collect the status information of the battery cells 100 through the sampling circuit board 200. At the same time, it can also save the internal space of the battery system 2. Furthermore, the cell sampling circuit 300 includes multiple functional circuit partitions 310, which are located in areas that avoid the pressure relief mechanism 110 of at least some of the battery cells 100. This can reduce the impact of the cell sampling circuit 300 on the pressure release of the battery cells 100 due to blocking the pressure relief mechanism 110, and improve the risk of thermal runaway caused by the damage to the cell sampling circuit 300 due to the pressure release of the battery cells 100.

[0088] 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 system, characterized in that, The battery system includes: Multiple battery cells, each of which includes a pressure relief mechanism; A sampling circuit board is located on the side of at least some of the battery cells that have the pressure relief mechanism; A cell sampling circuit is connected to the sampling circuit board. The cell sampling circuit includes multiple functional circuit partitions, which are located in areas that avoid the pressure relief mechanism of at least a portion of the battery cells.

2. The battery system according to claim 1, characterized in that, The battery cell sampling circuit includes multiple separately configured circuit carriers, each of which has at least one functional circuit partition, and each of which is connected to the sampling circuit board.

3. The battery system according to claim 1, characterized in that, Each of the functional circuit partitions includes a plurality of electronic components, wherein the height difference between at least some of the electronic components in the same functional circuit partition is set to be less than a preset height threshold.

4. The battery system according to claim 3, characterized in that, The height difference between at least some of the electronic components in the same functional circuit partition is greater than or equal to 0 and less than or equal to 2 mm.

5. The battery system according to claim 3, characterized in that, The plurality of functional circuit partitions include a first circuit partition, which includes a sampling main chip and a filter capacitor circuit.

6. The battery system according to claim 3, characterized in that, The multiple functional circuit partitions include a second circuit partition, which includes an equalization resistor circuit and a filter resistor circuit.

7. The battery system according to claim 3, characterized in that, The multiple functional circuit partitions include a third circuit partition, which includes a Zener diode circuit and a power supply filter capacitor circuit.

8. The battery system according to claim 3, characterized in that, The cell sampling circuit includes a communication circuit, which includes a transformer region and a capacitor region. The transformer region includes an inductor circuit, and the capacitor region includes a capacitor circuit. The transformer region and the capacitor region are located in different functional circuit partitions.

9. The battery system according to claim 1, characterized in that, The multiple functional circuit partitions include a power supply circuit partition, which includes an adjustment transistor circuit and a feedback resistor circuit.

10. The battery system according to claim 1, characterized in that, The cell sampling circuit includes a first type of element and a plurality of second type elements. The heating power of the first type of element is less than that of the second type of element. Different types of second type elements are located in different functional circuit partitions.

11. The battery system according to claim 10, characterized in that, The second type of component includes a sampling main chip, an equalization resistor circuit, and an adjustment transistor circuit, wherein the sampling main chip, the equalization resistor circuit, and the adjustment transistor circuit are located in different functional circuit partitions.

12. The battery system according to claim 10, characterized in that, The cell sampling circuit includes a heat-conducting component, which is connected to the sampling circuit board and the functional circuit partition with the second type of element, and / or the heat-conducting component is connected to the battery cell and the sampling circuit board corresponding to the functional circuit partition with the second type of element.

13. The battery system according to claim 1, characterized in that, The battery system includes a protective layer coated on at least a portion of the plurality of functional circuit partitions.

14. The battery system according to claim 1, characterized in that, The battery system includes multiple reinforcing plates connected to the side of the sampling circuit board away from the functional circuit partition. Each reinforcing plate and at least one functional circuit partition are correspondingly arranged in the thickness direction of the sampling circuit board.

15. The battery system according to claim 1, characterized in that, The cell sampling circuit is located between the sampling circuit board and the individual battery cell; Alternatively, the sampling circuit board is located between the cell sampling circuit and the individual battery cell.

16. The battery system according to claim 1, characterized in that, The plurality of battery cells are divided into at least one battery group, each battery cell includes an end wall portion, the pressure relief mechanism is located on the end wall portion, and the sampling circuit board, the cell sampling circuit and the plurality of end walls of the same battery group are located on the same side or different sides of the battery group.

17. The battery system according to claim 1, characterized in that, The number of the battery cell sampling circuits is at least two, and the at least two battery cell sampling circuits are spaced apart on the sampling circuit board. The at least two battery cell sampling circuits communicate with each other through a connector or the sampling circuit board.

18. The battery system according to claim 1, characterized in that, The number of sampling circuit boards is at least two, and the at least two sampling circuit boards are arranged at intervals. Each sampling circuit board is provided with the cell sampling circuit, and the cell sampling circuits on different sampling circuit boards communicate with each other through connectors.

19. The battery system according to any one of claims 1 to 18, characterized in that, The plurality of battery cells are divided into at least two battery groups, and the at least two battery groups are arranged adjacent to each other. The sampling circuit board includes a first board portion, a second board portion, and a third board portion. The first board portion is located in one of the battery groups, the third board portion is located in another adjacent battery group, and the second board portion is connected between the first board portion and the second board portion. At least one of the first board portion, the second board portion, and the third board portion is provided with the cell sampling circuit.

20. An electrical appliance, characterized in that, The electrical device includes the battery system according to any one of claims 1 to 19.

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