Battery, electric device, and pressure measurement device for battery cell group

Abstract

The present application discloses a battery, an electric device, and a pressure measurement device for a battery cell group. The battery comprises a case, a battery cell group and pressure sensors. An accommodating cavity is formed in the case. The battery cell group is arranged in the accommodating cavity. The pressure sensors are arranged on the case and are at least partially exposed toward the battery cell group for receiving and measuring a pressure applied by the battery cell group towards the case; the pressure sensor comprises a sensor housing and a sensing assembly, and the sensing assembly is arranged in the sensor housing and fixed to the sensor housing. The sensor housing is embedded in the case. In this way, the range of the pressure sensors can be reduced, thereby improving the measurement precision of the pressure sensors.

Description

Pressure detection device for batteries, electrical devices and battery packs

Technical field

[0001] The present application relates to the field of battery technology, and in particular to a pressure detection device for a battery, an electrical device, and a battery cell group. [Background Technology]

[0002] With the advancement of battery technology, battery cells are being used in a growing number of fields and are gradually replacing traditional fossil fuels in the automotive powertrain sector. Battery cells store chemical energy and controllably convert it into electrical energy. In recyclable battery cells, after discharge, the active material can be activated by recharging for continued use.

[0003] Typically, batteries contain a battery pack consisting of individual cells. These cells are at risk of swelling. Pressure sensors can be used to measure the pressure exerted by the battery pack to assess the extent of swelling. Existing pressure sensors generally have a large range, resulting in low pressure measurement accuracy.

[0004] [Summary of the invention]

[0005] In view of the above problems, the present application provides a pressure detection device for a battery, an electrical device, and a battery cell group, which can reduce the measuring range of the pressure sensor, thereby improving the measurement accuracy of the pressure sensor.

[0006] In a first aspect, the present application provides a battery comprising a housing, a battery cell group, and a pressure sensor. The housing defines a receiving cavity. The battery cell group is disposed in the receiving cavity. The pressure sensor is disposed in the housing and at least partially exposed toward the battery cell group, for receiving and detecting pressure applied by the battery cell group toward the housing. The pressure sensor comprises a sensor housing and a sensing component, the sensing component being disposed within and fixed to the sensor housing. The sensor housing is embedded in the housing.

[0007] By detecting the pressure applied by the battery pack, the above-mentioned method can promptly detect any expansion of the battery cells, facilitating timely risk mitigation measures. Furthermore, by placing the pressure sensor in the housing, with at least a portion of the pressure sensor exposed toward the battery pack, the housing can partially absorb the pressure applied by the battery pack toward the housing. This allows a portion of the pressure applied by the battery pack to be applied to the pressure sensor, thereby reducing the pressure sensor's range, improving its measurement accuracy, and reducing its size. Furthermore, the above-mentioned method facilitates assembly of the pressure sensor on the housing, as the housing can limit the pressure sensor, improving its securement.

[0008] In some embodiments, the housing is provided with a receiving groove, each pressure sensor is correspondingly disposed in a receiving groove, and at least a portion of the sensor housing is exposed toward the battery cell group through the receiving groove.

[0009] In the above manner, by arranging at least a portion of the pressure sensor to be exposed toward the battery cell group through the receiving groove, the pressure sensor can sense and detect the pressure applied by the battery cell group.

[0010] In some embodiments, the receiving groove has an exposure opening connected to the receiving cavity from a side of the housing facing the battery cell group, and the sensor housing has a sensing end face facing the battery cell group, which is exposed toward the battery cell group through the exposure opening.

[0011] Through the above-mentioned method, the pressure of the battery cell group can act on the pressure sensor through the sensing end surface, which is conducive to improving the detection accuracy.

[0012] In some embodiments, the sensing end surface is flush with the edge of the exposed opening, or the sensing end surface protrudes beyond the edge of the exposed opening.

[0013] Through the above method, the sensing end face and the housing can be synchronously subjected to the pressure of the battery cell group, thereby reducing the pressure load on the sensing end face and lowering the overload risk of the pressure sensor.

[0014] In some embodiments, the distance between the sensing end surface and the plane where the edge of the exposed opening is located is less than or equal to 1 mm.

[0015] By adopting the above method, the sensing end face can be allowed to move to be flush with the edge of the exposed opening after being subjected to the pressure of the battery cell group, thereby reducing the pressure load on the sensing end face and lowering the overload risk of the pressure sensor.

[0016] In some embodiments, the inner contour of the receiving groove matches the outer contour of the pressure sensor.

[0017] The above method facilitates the assembly of the pressure sensor in the accommodating groove, and the side wall of the accommodating groove can limit the pressure sensor in the radial direction, thereby improving the fixing effect of the pressure sensor in the accommodating groove.

[0018] In some embodiments, the receiving groove includes a main groove connected to the exposure opening, the main groove being located on a side of the exposure opening away from the battery cell pack, and the main groove and the exposure opening forming a first support surface facing away from the receiving cavity at their connection. The sensor housing includes a main housing portion and a pressure-bearing portion. The sensing assembly is disposed within and fixed to the main housing portion. The main housing portion is housed in the main groove and supported by the first support surface. At least a portion of the pressure-bearing portion is located at the exposure opening, and the pressure-bearing portion has a sensing end surface.

[0019] By providing the pressure-bearing portion in this manner, the area of ​​the pressure sensor exposed to the battery pack can be reduced, thereby reducing the pressure on the pressure sensor and lowering the measuring range. By arranging the main housing portion to be housed in the main groove and supported by the first support surface, the sensing body can compensate for the structural deficiencies and strength deficiencies of the housing at the location where the pressure sensor is mounted.

[0020] In some embodiments, the main slot includes a first slot section and a second slot section. The first slot section is located on the side of the second slot section away from the battery cell group. The radial dimension of the first slot section is larger than the radial dimension of the second slot section, thereby forming a second support surface facing away from the battery cell group at the connection between the first and second slot sections. The main housing portion includes a mating portion and a mounting portion. The mating portion is connected between the pressure-bearing portion and the mounting portion. The mating portion is located within the second slot section and supported by the first support surface. The mounting portion is located within the first slot section and supported by the second support surface.

[0021] In the above manner, by providing the second groove section and the mounting portion, the pressure sensor is easily assembled and fixed, thereby improving the fixing effect of the pressure sensor in the accommodating groove.

[0022] In some embodiments, the battery cell pack includes at least two battery cells, which are stacked. The housing includes an end plate disposed on at least one side of the at least two battery cells along the stacking direction of the at least two battery cells, and the pressure sensor is disposed on the end plate. The end plate is disposed opposite the battery cell pack along the stacking direction of the at least two battery cells.

[0023] In this way, the pressure sensor can detect the external pressure applied to the battery cell group in the stacking direction of at least two battery cells, so that the expansion state of the battery cell group in the stacking direction of at least two battery cells can be obtained through the pressure sensor.

[0024] In some embodiments, each battery cell includes a cell top, a cell side, and a cell bottom. The cell side is connected between the cell top and the cell bottom. The cell side includes two first cell sides and two second cell sides, the two first cell sides are disposed opposite each other, the two second cell sides are disposed opposite each other, the two second cell sides are connected between the two first cell sides, and the area of ​​the second cell side is greater than that of the first cell side. At least two battery cells are stacked with the second cell sides facing each other, and the end plate is disposed opposite the second cell side of the outermost stacked battery cell.

[0025] In the above manner, the expansion of each swollen battery cell in the stacking direction of at least two battery cells is superimposed, thereby further increasing the expansion degree of the battery cell group in the stacking direction of at least two battery cells, which can make the layout of the pressure sensor more reasonable, and the pressure detection result can more accurately reflect the expansion degree of the battery cell group, thereby improving the detection effectiveness of the pressure sensor.

[0026] In some embodiments, the end plate includes a pressure-bearing plate and a support plate. The pressure-bearing plate is disposed opposite the battery cell stack along the stacking direction of at least two battery cells. The pressure-bearing plate defines a receiving slot extending through both sides thereof. The support plate is connected to a side of the pressure-bearing plate facing away from the battery cell stack to seal the receiving slot on the side of the pressure-bearing plate facing away from the battery cell stack. The pressure sensor is housed within the receiving slot and is at least partially supported between the pressure-bearing plate and the support plate.

[0027] Through the above-mentioned method, the pressure sensor can be confined between the pressure-bearing plate body and the supporting plate body, which facilitates the assembly of the pressure sensor and improves the position stability of the pressure sensor.

[0028] In some embodiments, the thickness of the pressure plate body ranges from 3 mm to 20 mm.

[0029] In the above manner, the thickness of the pressure-bearing plate can be matched with the thickness of the pressure sensor. By setting the thickness range of the pressure-bearing plate to 3 mm to 20 mm, it is beneficial to achieve miniaturization of the pressure sensor.

[0030] In some embodiments, a hollow hole is provided on a side of the support plate and / or the pressure plate facing away from the battery cell group.

[0031] The above method is helpful to reduce the weight of the shell and thus reduce the weight of the battery.

[0032] In some embodiments, the housing includes an upper cover plate and a bottom plate disposed opposite each other, wherein an end plate is connected between the upper cover plate and the bottom plate. One end of the end plate is provided with an assembly hole and is connected to the upper cover plate through the assembly hole, and the other end of the end plate is provided with a buckle and is connected to the bottom plate through the buckle.

[0033] In the above manner, by providing an assembly hole at one end of the end plate and connecting it to the upper cover plate through the assembly hole, the connection stability between the end plate and the upper cover plate is improved. By providing a clip at the other end of the end plate and connecting it to the bottom plate through the clip, the assembly efficiency of the end plate and the bottom plate is improved.

[0034] In some embodiments, there are multiple pressure sensors, and the multiple pressure sensors are arranged in the housing at intervals.

[0035] This approach allows for multi-point testing of the battery pack, providing more comprehensive information on its expansion. Furthermore, multiple pressure sensors can share the pressure of the battery pack, reducing the range of each pressure sensor.

[0036] In some embodiments, a ratio of a difference between an elastic modulus of the sensor housing and an elastic modulus of the housing to the elastic modulus of the housing is less than or equal to 5 percent.

[0037] The above method is conducive to uniform stress on the sensor housing and the housing, reducing the difference in load borne by the sensor housing and the housing, and allowing the sensor housing and the housing to deform synchronously when subjected to pressure from the battery cell group.

[0038] In some embodiments, the sensor housing has a preset shell wall that is arranged opposite to the battery cell group and exposed, the outer surface of the preset shell wall faces the battery cell group, and the sensing component is arranged on the inner surface of the preset shell wall away from its outer surface, and the outer surface of the preset shell wall is used to withstand the pressure exerted by the battery cell.

[0039] The above method is helpful to improve the accuracy of the pressure sensor detection result.

[0040] In some embodiments, the sensing assembly includes a positive electrode interface, a negative electrode interface, two detection interfaces, and two sets of stress resistors. The two sets of stress resistors are fixed to the sensor housing, each set of stress resistors including two stress resistors connected in series. The two sets of stress resistors are connected in parallel between the positive electrode interface and the negative electrode interface. The two detection interfaces are connected between the two stress resistors in the two sets of stress resistors, respectively.

[0041] By adopting the above method, the influence of temperature fluctuation on the expansion degree and pressure measurement results can be effectively reduced.

[0042] In a second aspect, the present application provides an electrical device comprising the above-mentioned battery.

[0043] In a third aspect, the present application provides a pressure detection device for a battery cell pack, comprising a housing and a pressure sensor. The housing defines a receiving cavity. The battery cell pack is disposed in the receiving cavity. The pressure sensor is disposed within the housing and at least partially exposed toward the battery cell pack, for receiving and detecting pressure applied by the battery cell pack toward the housing. The sensor housing is embedded within the housing.

[0044] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

Brief Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0046] FIG1 is a schematic structural diagram of a vehicle according to one or more embodiments;

[0047] FIG2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments;

[0048] FIG3 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments;

[0049] FIG4 is another exploded structural diagram of a battery according to one or more embodiments;

[0050] FIG5 is a schematic diagram of the structure of the battery shown in FIG4 with some parts hidden;

[0051] FIG6 is a schematic diagram of a partial top view of a battery according to one or more embodiments;

[0052] FIG7 is a schematic diagram of an installation structure of a pressure sensor according to one or more embodiments;

[0053] FIG8 is a schematic diagram of another installation structure of a pressure sensor according to one or more embodiments;

[0054] FIG9 is a schematic structural diagram of the end plate shown in FIG8 ;

[0055] FIG10 is a schematic structural diagram of the pressure sensor shown in FIG8 ;

[0056] FIG11 is a schematic diagram of another installation structure of a pressure sensor according to one or more embodiments;

[0057] FIG12 is a schematic structural diagram of an end plate according to one or more embodiments;

[0058] FIG13 is a schematic diagram of a circuit structure of a sensing component according to one or more embodiments;

[0059] FIG14 is a schematic structural diagram of a pressure detection device according to one or more embodiments.

[0060] Reference numerals in the specific embodiments are as follows: 1000a vehicle; 100a battery; 200a controller; 300a motor; 10a housing; 11a first portion; 12a second portion; 101 accommodating cavity; 102 accommodating slot; 103 exposure opening; 104 main slot; 1041 first slot section; 1042 second slot section; 105 first support table; 106 second support table; 107 end plate; 1071 pressure-bearing plate; 1072 support plate; 1073 hollow hole; 1074 assembly hole; 1075 buckle; 108 upper cover plate; 109 bottom plate; 130 pressure detection device; 1 Battery cell; 100 Shell; 110 Containment shell; 112 Opening; 120 End cap; 121 Post; 200 Electrode assembly; 201 Tab; 11 Cell top; 12 Cell side; 13 Cell bottom; 14 First cell side; 15 Second cell side; 300 Pressure sensor; 301 Sensing end face; 310 Main housing; 311 Fitting portion; 312 Mounting portion; 320 Pressure-bearing portion; 330 Sensor housing; 340 Sensing assembly; 341 Positive electrode interface; 342 Negative electrode interface; 343 Detection interface; 344 Stress resistor; 350 Preset shell wall; 400 Battery cell group; 410 Top; 420 Side; 421 First side; 422 Second side; 430 Bottom; L1 Distance between the sensing end face and the plane where the edge of the exposed opening is located; L2 Thickness of the pressure-bearing plate; D1 Radial direction; D2 Arrangement direction of the two second side portions; D3 Stacking direction. [Specific implementation method]

[0061] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0063] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0064] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0065] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0066] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0067] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0068] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0069] With the advancement of battery technology, battery cells are being used in a growing number of fields and are gradually replacing traditional fossil fuels in the automotive powertrain sector. Battery cells store chemical energy and controllably convert it into electrical energy. In recyclable battery cells, after discharge, the active material can be activated by recharging for continued use.

[0070] Batteries contain a battery pack, which is composed of individual cells. These cells are at risk of swelling. Pressure sensors can be used to measure the pressure exerted by the battery pack to assess the extent of swelling. Existing pressure sensors generally have a large range, resulting in low pressure measurement accuracy.

[0071] In order to improve the pressure measurement accuracy, the pressure sensor is set in the casing. The pressure applied by the battery cell group to the outside is applied to the sensor casing. The casing will share part of the pressure applied by the battery cell group toward the casing for the pressure sensor, thereby allowing the pressure sensor's range to be reduced, thereby improving the measurement accuracy of the pressure sensor.

[0072] Based on the above considerations, the present application provides a pressure detection device for a battery, an electrical device and a battery cell group. Among them, the battery includes a housing, a battery cell group and a pressure sensor. The housing is provided with a receiving cavity. The battery cell group is arranged in the receiving cavity. The pressure sensor is arranged in the housing and is at least partially exposed toward the battery cell group, so as to receive and detect the pressure applied by the battery cell group toward the housing. The pressure sensor includes a sensor housing and a sensing component, and the sensing component is arranged inside the sensor housing and fixed to the sensor housing. The sensor housing is embedded in the housing. In this way, the housing will share part of the pressure applied by the battery cell group toward the housing for the pressure sensor, thereby allowing the range of the pressure sensor to be reduced, thereby improving the measurement accuracy of the pressure sensor and reducing the volume of the pressure sensor.

[0073] The pressure detection device for the battery, electrical device, and battery cell group disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. The electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery cars, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0074] For the convenience of description, the following embodiments are described by taking a vehicle 1000a as an example of an electrical device according to an embodiment of the present application.

[0075] Referring to Figure 1, vehicle 1000a can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 100a is provided inside vehicle 1000a. Battery 100a can be provided at the bottom, head, or tail of vehicle 1000a. Battery 100a can be used to power vehicle 1000a. For example, battery 100a can serve as an operating power source for vehicle 1000a. Vehicle 1000a can also include a controller 200a and a motor 300a. Controller 200a is used to control battery 100a to power motor 300a, for example, to meet the power requirements for starting, navigating, and driving the vehicle 1000a.

[0076] In some embodiments of the present application, the battery 100a can serve not only as an operating power source for the vehicle 1000a, but also as a driving power source for the vehicle 1000a, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000a.

[0077] In some embodiments, the battery 100a may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0078] The battery 100 a mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 1 to provide higher voltage and capacity.

[0079] In the embodiment of the present application, the battery cell 1 may be a secondary battery, which refers to a battery cell 1 that can be recharged to activate the active material after discharge and continue to be used. Each battery cell 1 may also be a primary battery.

[0080] The battery cell 1 includes, but is not limited to, a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The battery cell 1 may be cylindrical, flat, rectangular, or have other shapes.

[0081] In some embodiments, the battery 100 a may be a battery module. When there are multiple battery cells 1 , the multiple battery cells 1 are arranged and fixed to form a battery module.

[0082] In some embodiments, referring to FIG. 2 , the battery 100 a may be a battery pack, which includes a housing 10 a and a battery cell 1 . The battery cell 1 or battery module is housed in the housing 10 a .

[0083] In some embodiments, the housing 10a may serve as part of the chassis structure of the vehicle 1000a. For example, a portion of the housing 10a may form at least a portion of the floor of the vehicle 1000a, or a portion of the housing 10a may form at least a portion of a cross member or a longitudinal member of the vehicle 1000a.

[0084] Referring to Figure 2, the battery 100a includes a housing 10a and a battery cell 1, and the battery cell 1 is accommodated in the housing 10a. The housing 10a is used to provide a storage cavity 101 for the battery cell 1, and the housing 10a can adopt a variety of structures. In some embodiments, the housing 10a may include a first portion 11a and a second portion 12a, and the first portion 11a and the second portion 12a cover each other, and the first portion 11a and the second portion 12a jointly define a storage cavity 101 for accommodating the battery cell 1. The second portion 12a may be a hollow structure with one end open, and the first portion 11a may be a plate-like structure, and the first portion 11a covers the open side of the second portion 12a, so that the first portion 11a and the second portion 12a jointly define the storage cavity 101; the first portion 11a and the second portion 12a may also be hollow structures with one side open, and the open side of the first portion 11a covers the open side of the second portion 12a. Of course, the housing 10a formed by the first portion 11a and the second portion 12a can be in various shapes, such as a cylinder, a cuboid, etc.

[0085] In battery 100a, there may be multiple battery cells 1, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cells 1. Multiple battery cells 1 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell 1 may be contained within the housing 10a. Alternatively, battery 100a may comprise multiple battery cells 1 connected in series, in parallel, or in a hybrid configuration to form a battery module, which is then connected in series, in parallel, or in a hybrid configuration to form a single unit contained within the housing 10a. Battery 100a may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 1.

[0086] Referring to Figure 3 , a battery cell 1 is the smallest unit of a battery. In this embodiment, a cylindrical battery cell 1 is used as an example. As shown in Figure 3 , the battery cell 1 includes a housing 100 , an electrode assembly 200 , and other functional components.

[0087] In some embodiments, the housing 100 is used to encapsulate the electrode assembly 200 and the electrolyte and other components. The housing 100 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film.

[0088] The housing 100 may include an end cover 120 and a containment shell 110. The end cover 120 refers to a component that covers the opening of the containment shell 110 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cover 120 can be adapted to the shape of the containment shell 110 to match the containment shell 110. Optionally, the end cover 120 can be made of a material with a certain rigidity and strength (such as aluminum alloy), so that the end cover 120 is not easily deformed when squeezed or collided, so that the battery cell 1 can have a higher structural strength and improved safety performance. Functional components such as a pole 121 may be provided on the end cover 120. The pole 121 can be used to electrically connect to the electrode assembly 200 for outputting or inputting electrical energy of the battery cell 1. In some embodiments, the end cover 120 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold. The end cap 120 can also be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating component can be disposed inside the end cap 120 to isolate the electrical connection components within the housing 110 from the end cap 120 to reduce the risk of short circuits. Exemplary materials include plastic, rubber, etc.

[0089] The containment shell 110 is a component used to cooperate with the end cap 120 to form the internal environment of the battery cell 1, wherein the formed internal environment can be used to accommodate the electrode assembly 200, electrolyte, and other components. The containment shell 110 and the end cap 120 can be independent components. An opening 112 can be provided in the containment shell 110, and the end cap 120 is closed at the opening 112 to form the internal environment of the battery cell 1. Alternatively, the end cap 120 and the containment shell 110 can be integrated. Specifically, the end cap 120 and the containment shell 110 can form a common connection surface before other components are inserted into the shell. When the interior of the containment shell 110 needs to be encapsulated, the end cap 120 is closed over the containment shell 110. The containment shell 110 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the containment shell 110 can be determined based on the specific shape and size of the electrode assembly 200. The material of the housing 110 can be various, for example, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0090] The electrode assembly 200 is a component where electrochemical reactions occur in the battery cell 1. One or more electrode assemblies 200 may be contained in the housing 110.

[0091] In some embodiments, the electrode assembly 200 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 1, active ions (e.g., lithium ions) are intercalated and released between the positive and negative electrodes. The separator is positioned between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0092] 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.

[0093] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0094] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0095] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0096] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0097] As an example, the negative electrode current collector may be a metal foil, a metal foam, a composite current collector, or a carbon foam. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium may be used. The metal foam may be nickel foam, copper foam, aluminum foam, or an alloy foam. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0098] 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.

[0099] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0100] As an example, the negative electrode active material may adopt the negative electrode active material for battery cell 1 that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0101] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0102] In some embodiments, the electrode assembly 200 further includes a separator disposed between the positive electrode and the negative electrode.

[0103] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0104] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0105] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0106] In some embodiments, the battery cell 1 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte may be selected based on needs. The electrolyte may be liquid, gel, or solid.

[0107] The electrolyte may be a form of electrolyte and may include an electrolyte salt and a solvent.

[0108] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0109] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be an ether solvent. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0110] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0111] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0112] As an example, the polymer solid electrolyte may be polyether, polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, etc. As an example, the polymer solid electrolyte may be polyethylene oxide.

[0113] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0114] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0115] In some embodiments, the electrode assembly 200 is a wound structure in which the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0116] In some embodiments, the electrode assembly 200 is provided with tabs 201 that conduct current from the electrode assembly 200. Tabs include positive and negative tabs. The positive and negative tabs can be located together at one end of the main body or separately at opposite ends of the main body. During the charge and discharge process of the battery 100a, the positive and negative active materials react with the electrolyte, and the tabs 201 connect to the electrode posts 121 to form a current loop.

[0117] According to some embodiments of the present application, as shown in Figures 4 to 6, the battery 100a described in the battery embodiment of the present application includes a housing 10a, a battery cell group 400 and a pressure sensor 300. The housing 10a is provided with a receiving cavity 101. The battery cell group 400 is disposed in the receiving cavity 101. The pressure sensor 300 is disposed in the housing 10a and is at least partially exposed toward the battery cell group 400, so as to receive and detect the pressure applied by the battery cell group 400 toward the housing 10a. The pressure sensor 300 includes a sensor housing 330 and a sensing component 340. The sensing component 340 is disposed inside the sensor housing 330 and fixed to the sensor housing 330.

[0118] The battery pack 400 includes at least one battery cell 1. During the production, testing, transportation, use, and maintenance of the battery 100a, there is a risk of expansion of the battery cell 1. For example, expansion may occur when the battery cell 1 experiences local overpressure, abnormal gassing, or localized lithium deposition. The pressure sensor 300 can detect the pressure applied by the battery pack 400 toward the outer casing 10a, enabling prompt detection of expansion of the battery cell 1 and enabling timely mitigation measures.

[0119] Flexible sensors with a wide pressure range often have lower accuracy and are larger in size, occupying more space within battery 100a and hindering the improvement of battery 100a's volumetric energy density. Furthermore, the sensor housing 330 has a certain degree of rigidity, making it more resistant to deformation than flexible sensors. This allows for a reduced range of pressure sensor 300, thereby improving its measurement accuracy and reducing its size.

[0120] In some embodiments, the battery 100a includes a processor, or the battery 100a can be connected to an external processor. The processor can evaluate the degree of expansion of the battery cell group 400 based on the pressure value measured by the pressure sensor 300. For example, 9 pressure sensors 300 are set in the battery 100a, and the 9 pressure sensors 300 can respectively output a pressure value. The 9 pressure values ​​can be recorded as F1, F2, F3, F4, F5, F6, F7, F8 and F9, respectively. Each pressure value can reflect the local expansion degree of the battery cell group 400. The processor can also calculate the total force F10 applied by the battery cell group 400 toward the housing 10a based on the 9 pressure values. F10 can reflect the overall expansion degree of the battery cell group 400. In this way, the working status of the battery 100a can be tested or monitored.

[0121] For example, the processor may compare each of the nine pressure values ​​with a first preset pressure threshold. If a particular pressure value exceeds the first preset pressure threshold, it indicates that localized expansion of the battery pack 400 at the location of the corresponding pressure sensor 300 has occurred. If localized expansion persists for a period of time, a local overpressure warning may be issued. For another example, the processor may compare F10 with a second preset pressure threshold. If F10 exceeds the second preset pressure threshold, it indicates that overall expansion of the corresponding battery pack 400 has occurred. If overall expansion persists for a period of time, an overall overpressure warning may be issued.

[0122] 6 and 7 , the thickness L3 of the pressure sensor 300 ranges from 2.5 mm to 20 mm. Further, the thickness L3 of the pressure sensor 300 ranges from 3 mm to 5 mm, for example, the thickness L3 of the pressure sensor 300 is 3 mm.

[0123] Optionally, the maximum range of the pressure sensor 300 is 100 N to 10000 N. Further, the maximum range of the pressure sensor 300 is 200 N to 400 N, for example, the maximum range of the pressure sensor 300 is 200 N.

[0124] Optionally, the detection area of ​​a single pressure sensor 300 is 0.5 cm 2 ~10cm 2 .

[0125] Optionally, the pressure sensor 300 is embedded in the housing 10a.

[0126] According to some embodiments of the present application, optionally, as shown in FIG. 6 and FIG. 7 , the sensor housing 330 is embedded in the housing 10 a.

[0127] The pressure exerted by the battery pack 400 on the outer casing 10a is partially applied to the pressure sensor 300, while the remaining pressure is applied to the outer casing 10a through the inner surface of the outer casing 10a. In other words, the outer casing 10a partially absorbs the pressure exerted by the battery pack 400 on the outer casing 10a from the pressure sensor 300. If the pressure sensor is positioned between the battery pack 400 and the outer casing 10a, the outer casing 10a will not absorb the pressure from the pressure sensor, and the pressure sensor will require a larger range to meet measurement requirements.

[0128] Such a configuration also facilitates the assembly of the pressure sensor 300 on the housing 10 a . The housing 10 a can limit the pressure sensor 300 , thereby improving the fixing effect of the pressure sensor 300 .

[0129] Furthermore, the area of ​​the housing 10a subjected to pressure is much larger than the area of ​​the pressure sensor 300 subjected to pressure. Therefore, the housing 10a will distribute most of the pressure applied by the battery pack 400 toward the housing 10a to the pressure sensor 300, thereby reducing the measuring range of the pressure sensor 300 to a smaller range. For example, if the area of ​​the housing 10a subjected to pressure measures 148 mm x 102.5 mm, and the area of ​​the pressure sensor 300 subjected to pressure measures 10 mm in diameter, the housing 10a will distribute most of the pressure applied by the battery pack 400 toward the housing 10a to the pressure sensor 300.

[0130] Since the pressure sensor 300 has a certain rigidity, the pressure sensor 300 and the housing 10a can function together to encapsulate the battery cell group 400. The presence of the pressure sensor 300 can compensate for the structural deficiency and insufficient strength of the housing 10a at the location where the pressure sensor 300 is installed.

[0131] According to some embodiments of the present application, optionally, as shown in Figures 8 to 10, the housing 10a is provided with a receiving groove 102, each pressure sensor 300 is correspondingly arranged in an receiving groove 102, and at least a portion of the sensor housing 330 is exposed toward the battery cell group 400 through the receiving groove 102.

[0132] The receiving groove 102 can communicate with the receiving cavity 101. The provision of the receiving groove 102 facilitates assembly of the pressure sensor 300 on the housing 10a. By arranging at least a portion of the pressure sensor 300 so that it is exposed toward the battery pack 400 through the receiving groove 102, the pressure sensor 300 can sense and detect the pressure applied by the battery pack 400.

[0133] According to some embodiments of the present application, optionally, as shown in Figures 8 to 10, the accommodating groove 102 has an exposure port 103 connected to the accommodating cavity 101 from one side of the outer shell 10a toward the battery cell group 400, and the pressure sensor 300 has a sensing end face 301 facing the battery cell group 400, and the sensing end face 301 is exposed toward the battery cell group 400 through the exposure port 103.

[0134] Such an arrangement allows the pressure of the battery cell group 400 to act on the pressure sensor 300 through the sensing end surface 301 , which is beneficial to improving the detection accuracy.

[0135] According to some embodiments of the present application, as shown in Figures 8 to 10 , the sensing end surface 301 is optionally flush with the edge of the exposure opening 103. This arrangement allows the sensing end surface 301 and the housing 10a to be simultaneously subjected to pressure from the battery pack 400, reducing the pressure load on the sensing end surface 301 and the risk of overloading the pressure sensor 300.

[0136] Optionally, as shown in FIG. 11 , the sensing end surface 301 protrudes beyond the edge of the exposure opening 103 .

[0137] Such an arrangement allows the sensing end surface 301 to be subjected to the pressure of the battery cell group 400 earlier than the housing 10 a , which is beneficial for improving the sensitivity of the pressure sensor 300 .

[0138] When the pressure applied by the battery cell group 400 toward the outer shell 10a is large, after the sensing end face 301 is subjected to the pressure of the battery cell group 400, the pressure sensor 300 may deform so that the sensing end face 301 moves away from the battery cell group 400 until the sensing end face 301 is flush with the edge of the exposed port 103, thereby reducing the pressure load on the sensing end face 301 and reducing the overload risk of the pressure sensor 300.

[0139] According to some embodiments of the present application, optionally, as shown in FIG11 , a spacing distance L1 between the sensing end surface 301 and a plane where an edge of the exposure opening 103 is located is less than or equal to 1 mm.

[0140] For example, the spacing distance L1 between the sensing end surface 301 and the plane where the edge of the exposure opening 103 is located includes 0.1 mm, 0.3 mm, 0.5 mm or 0.8 mm.

[0141] By setting the spacing distance L1 between the sensing end face 301 and the plane where the edge of the exposure port 103 is located to be less than or equal to 1 mm, the sensing end face 301 can be allowed to move to be flush with the edge of the exposure port 103 after being subjected to pressure from the battery cell group 400, thereby reducing the pressure load on the sensing end face 301 and reducing the overload risk of the pressure sensor 300.

[0142] When the distance L1 between the sensing end surface 301 and the plane where the edge of the exposure opening 103 is located is 0, the sensing end surface 301 is flush with the edge of the exposure opening 103 .

[0143] According to some embodiments of the present application, optionally, as shown in Figures 8 to 10 , the inner contour of the receiving groove 102 matches the outer contour of the pressure sensor 300. For example, the inner contour of the receiving groove 102 and the outer contour of the pressure sensor 300 are configured as mutually matching cylindrical shapes.

[0144] This arrangement facilitates the assembly of the pressure sensor 300 within the receiving groove 102. The sidewalls of the receiving groove 102 can limit the pressure sensor 300 in the radial direction, thereby improving the fixation of the pressure sensor 300 within the receiving groove 102. The radial direction D1 is perpendicular to the direction in which the battery cell group 400 applies pressure to the pressure sensor 300.

[0145] According to some embodiments of the present application, optionally, as shown in Figures 8 to 10, the receiving groove 102 includes a main groove 104 connected to the exposure opening 103. The main groove 104 is located on the side of the exposure opening 103 away from the battery cell group 400, and the main groove 104 and the exposure opening 103 form a first support table 105 facing away from the receiving cavity 101 at the connection. The sensor housing 330 includes a main housing portion 310 and a pressure-bearing portion 320. The sensing assembly 340 is disposed within and fixed to the main housing portion 310. The main housing portion 310 is accommodated in the main groove 104 and supported on the first support table 105. At least a portion of the pressure-bearing portion 320 is located at the exposure opening 103, and the pressure-bearing portion 320 has a sensing end surface 301.

[0146] When the pressure-bearing portion 320 is subjected to pressure from the battery pack 400, it moves away from the pack 400, causing partial deformation of the main housing portion 310. The pressure sensor 300 can calculate the pressure applied based on the degree of deformation of the main housing portion 310. Furthermore, the pressure-bearing portion 320 is coaxially connected to the main housing portion 310, and the radial dimension of the main housing portion 310 is larger than the radial dimension of the pressure-bearing portion 320. This allows for a more regular deformation distribution of the main housing portion 310, improving pressure detection accuracy. The radial direction D1 is perpendicular to the direction in which the battery pack 400 applies pressure to the pressure sensor 300.

[0147] The pressure-bearing portion 320 reduces the area of ​​the pressure sensor 300 exposed to the battery pack 400, thereby reducing the pressure on the pressure sensor 300 and lowering its range. By arranging the main housing portion 310 within the main groove 104 and supported by the first support surface 105, the sensing body compensates for the structural deficiencies and strength of the housing 10a at the location where the pressure sensor 300 is mounted.

[0148] Optionally, the radial dimension of the main housing portion 310 matches the radial dimension of the main groove 104 , and the radial dimension of the pressure-bearing portion 320 matches the radial dimension of the exposure opening 103 .

[0149] In other embodiments, the main housing portion 310 is accommodated in the main groove 104 and is spaced apart from the first support table 105. In this way, the main housing portion 310 will not be subjected to the pressure transmitted through the first support table 105, which is conducive to improving the accuracy of pressure detection.

[0150] In other embodiments, the receiving groove 102 includes a main groove 104 connected to the exposure opening 103. The main groove 104 is located on the side of the exposure opening 103 away from the battery cell group 400. At the connection between the main groove 104 and the exposure opening 103, the radial dimension of the main groove 104 is equal to the radial dimension of the exposure opening 103, thereby eliminating the aforementioned first support platform 105. The main housing portion 310 is accommodated in the main groove 104, and at least a portion of the pressure-bearing portion 320 is located at the exposure opening 103.

[0151] According to some embodiments of the present application, as shown in Figures 8 to 10 , the main slot 104 includes a first slot section 1041 and a second slot section 1042. The first slot section 1041 is located on the side of the second slot section 1042 away from the battery cell group 400. The radial dimension of the first slot section 1041 is larger than the radial dimension of the second slot section 1042. Thus, a second support surface 106 facing away from the battery cell group 400 is formed at the junction of the first slot section 1041 and the second slot section 1042. The main housing portion 310 includes a mating portion 311 and a mounting portion 312. The mating portion 311 is connected between the pressure-bearing portion 320 and the mounting portion 312. The mating portion 311 is located within the second slot section 1042 and supported by the first support surface 105. The mounting portion 312 is located within the first slot section 1041 and supported by the second support surface 106.

[0152] When the pressure-bearing portion 320 is subjected to pressure from the battery cell pack 400, it moves away from the battery cell pack 400, causing partial deformation of the mating portion 311. The pressure sensor 300 can calculate the applied pressure based on the degree of deformation of the mating portion 311. Furthermore, the pressure-bearing portion 320 and the mating portion 311 are coaxially connected, and the radial dimension of the mating portion 311 is larger than that of the pressure-bearing portion 320. This ensures a more regular deformation distribution of the mating portion 311, improving pressure detection accuracy.

[0153] The second support surface 106 serves to limit the mounting portion 312, restricting the pressure sensor 300 from moving closer to the battery cell stack 400. The second groove section 1042 and the mounting portion 312 facilitate assembly and securement of the pressure sensor 300, improving its securement within the receiving slot 102. For example, the mounting portion 312 may have a through hole, and the second support surface 106 may have a threaded hole corresponding to the through hole. Threaded fasteners may be inserted into the through hole and the threaded hole to secure the pressure sensor 300 to the housing 10a.

[0154] Optionally, the radial dimension of the matching portion 311 matches the radial dimension of the second slot segment 1042 . The radial dimension of the mounting portion 312 matches the radial dimension of the first slot segment 1041 .

[0155] According to some embodiments of the present application, the battery cell group 400 optionally includes at least two battery cells 1, which are stacked. The housing 10a includes an end plate 107 disposed on at least one side of the at least two battery cells 1 along a stacking direction D3 of the at least two battery cells 1, and the pressure sensor 300 is disposed on the end plate 107. The end plate 107 is disposed opposite the battery cell group 400 along the stacking direction D3 of the at least two battery cells 1.

[0156] In this configuration, the pressure sensor 300 can detect the pressure applied by the battery cell group 400 toward the outer shell 10a in the stacking direction D3 of at least two battery cells 1, thereby obtaining the expansion state of the battery cell group 400 in the stacking direction D3 of at least two battery cells 1 through the pressure sensor 300.

[0157] 4 , the battery pack 400 includes a top 410 , a side 420 and a bottom 430 , wherein the side 420 is connected between the top 410 and the bottom 430 . The housing 10a includes an end plate 107 opposite to the side 420 , and the pressure sensor 300 is disposed on the end plate 107 .

[0158] With this configuration, the pressure sensor 300 can detect the pressure from the side portion 420 of the battery cell group 400 , and thus the expansion state of the side portion 420 of the battery cell group 400 can be obtained through the pressure sensor 300 .

[0159] Optionally, as shown in FIG4 , the side portion 420 includes two first side portions 421 and two second side portions 422. The two first side portions 421 are disposed opposite each other, the two second side portions 422 are disposed opposite each other, and the two second side portions 422 are connected between the two first side portions 421. The battery cell group 400 includes at least two battery cells 1, which are stacked along the arrangement direction D2 of the two second side portions 422. The end plate 107 is disposed opposite the second side portion 422.

[0160] In this configuration, the pressure sensor 300 can detect the pressure applied by the battery cell group 400 toward the housing 10 a in the stacking direction D3 of at least two battery cells 1 .

[0161] According to some embodiments of the present application, optionally, as shown in FIG4 , each battery cell 1 includes a cell top 11, a cell side 12, and a cell bottom 13. The cell side 12 is connected between the cell top 11 and the cell bottom 13. The cell side 12 includes two first cell sides 14 and two second cell sides 15. The two first cell sides 14 are disposed opposite each other, and the two second cell sides 15 are disposed opposite each other. The two second cell sides 15 are connected between the two first cell sides 14, and the area of ​​the second cell side 15 is larger than that of the first cell side 14. At least two battery cells 1 are stacked with the second cell sides 15 facing each other, and the end plate 107 is disposed opposite the second cell side 15 of the outermost stacked battery cell 1.

[0162] By setting the area of ​​the second cell side portion 15 to be larger than the area of ​​the first cell side portion 14, the battery cell 1 is more likely to deform in a direction perpendicular to the second cell side portion 15. By stacking at least two battery cells 1 along the stacking direction D3 with their second cell side portions 15 facing each other, the expansion of each expanded battery cell 1 in the stacking direction D3 of the at least two battery cells 1 is superimposed, thereby further increasing the degree of expansion of the battery cell group 400 in the stacking direction D3 of the at least two battery cells 1.

[0163] Such an arrangement can make the layout of the pressure sensor 300 more reasonable, and the pressure detection result can more accurately reflect the expansion degree of the battery cell group 400, thereby improving the detection effectiveness of the pressure sensor 300.

[0164] Optionally, at least two battery cells 1 are stacked along the stacking direction D3 with the second cell side portions 15 facing each other, so that the two second cell side portions 15 located in the front and rear of the at least two battery cells 1 in the stacking direction D3 are respectively formed into two second side portions 422, the first cell side portions 14 are combined to form a first side portion 421, the cell tops 11 are combined to form a top 410, and the cell bottoms 13 form a bottom 430.

[0165] According to some embodiments of the present application, optionally, as shown in Figures 8 to 10, the end plate 107 includes a pressure-bearing plate body 1071 and a support plate body 1072. The pressure-bearing plate body 1071 is arranged opposite to the battery cell group 400 along the stacking direction D3 of at least two battery cells 1. The pressure-bearing plate body 1071 is provided with a receiving groove 102 running through both sides thereof, and the support plate body 1072 is connected to the side of the pressure-bearing plate body 1071 facing away from the battery cell group 400 to block the receiving groove 102 on the side of the pressure-bearing plate body 1071 facing away from the battery cell group 400. The pressure sensor 300 is accommodated in the receiving groove 102 and is at least partially supported between the pressure-bearing plate body 1071 and the support plate body 1072.

[0166] During assembly, the pressure sensor 300 is first placed in the receiving groove 102, and then the pressure plate 1071 and the support plate 1072 are secured. The support plate 1072 restricts the pressure sensor 300 from moving away from the battery cell group 400. This arrangement constrains the pressure sensor 300 between the pressure plate 1071 and the support plate 1072, facilitating assembly of the pressure sensor 300 and improving its positional stability.

[0167] Optionally, a channel connecting the accommodating groove 102 with the outside world is provided between the pressure-bearing plate body 1071 and the supporting plate body 1072 , and the wires of the pressure sensor 300 can be electrically connected to the outside world through the channel.

[0168] According to some embodiments of the present application, optionally, as shown in Figure 8, the thickness L2 of the pressure-bearing plate body 1071 ranges from 3 mm to 20 mm. For example, the thickness L2 of the pressure-bearing plate body 1071 can be set to 3 mm, 5 mm, or 10 mm.

[0169] The thickness L2 of the pressure plate 1071 can match the thickness L3 of the pressure sensor 300 to facilitate fixing the pressure sensor 300. By setting the thickness L2 of the pressure plate 1071 to a range of 3 mm to 20 mm, the pressure sensor 300 can be miniaturized.

[0170] According to some embodiments of the present application, optionally, as shown in FIG. 8 and FIG. 12 , a hollow hole 1073 is provided on a side of the support plate 1072 and / or the pressure plate 1071 facing away from the battery cell group 400 .

[0171] Such a configuration is helpful to reduce the weight of the housing 10a, thereby reducing the weight of the battery 100a.

[0172] According to some embodiments of the present application, as shown in Figures 4 and 12 , the housing 10a optionally includes an upper cover plate 108 and a bottom plate 109 disposed opposite each other, with an end plate 107 connected between the upper cover plate 108 and the bottom plate 109. One end of the end plate 107 is provided with an assembly hole 1074 and is connected to the upper cover plate 108 via the assembly hole 1074. The other end of the end plate 107 is provided with a snap 1075 and is connected to the bottom plate 109 via the snap 1075. Furthermore, the housing 10a includes the upper cover plate 108 disposed opposite the top 410 and the bottom plate 109 disposed opposite the bottom 430.

[0173] For example, the end plate 107 can be connected to the upper cover plate 108 by inserting a threaded connector into the assembly hole 1074. Providing an assembly hole 1074 at one end of the end plate 107 and connecting it to the upper cover plate 108 through the assembly hole 1074 helps improve the connection stability between the end plate 107 and the upper cover plate 108. Providing a buckle 1075 at the other end of the end plate 107 and connecting it to the bottom plate 109 through the buckle 1075 helps improve the assembly efficiency of the end plate 107 and the bottom plate 109.

[0174] In some embodiments, the position where the pressure sensor 300 can be set in the housing 10 a includes the upper cover plate 108 and the bottom plate 109 .

[0175] According to some embodiments of the present application, optionally, as shown in FIG4 , there are multiple pressure sensors 300 , and the multiple pressure sensors 300 are arranged at intervals in the housing 10 a .

[0176] This configuration allows for multi-point detection of the battery cell group 400, enabling more comprehensive expansion information of the battery cell group 400 to be obtained. Furthermore, the pressure of the battery cell group 400 can be shared among multiple pressure sensors 300, thereby reducing the measurement range of each pressure sensor 300.

[0177] Optionally, the number of pressure sensors 300 is set in a range of 3 to 200. For example, the number of pressure sensors 300 is 9 and they are distributed in an array.

[0178] According to some embodiments of the present application, optionally, as shown in FIG10 , the ratio of the difference between the elastic modulus of the sensor housing 330 and the elastic modulus of the housing 10a to the elastic modulus of the housing 10a is less than or equal to 5 percent. For example, the sensor housing 330 and the housing 10a have the same stiffness. Furthermore, the ratio of the difference between the elastic modulus of the sensor housing 330 and the elastic modulus of the housing 10a to the elastic modulus of the housing 10a is less than or equal to 1 percent.

[0179] The sensor housing 330 can withstand the pressure of the battery pack 400 and undergo partial deformation. The sensing assembly 340 can deform accordingly. This deformation of the sensor housing 330 outputs an electrical signal related to the deformation. This electrical signal is processed to obtain the pressure value measured by the pressure sensor 300. The sensor housing 330 has a certain degree of rigidity, so it can work together with the outer casing 10a to encapsulate the battery pack 400. The presence of the sensor housing 330 can compensate for the structural deficiencies and strength of the outer casing 10a at the location where the pressure sensor 300 is mounted.

[0180] By configuring the sensor housing 330 to have a similar or identical stiffness to the housing 10a, the sensor housing 330 and the housing 10a are evenly stressed, minimizing the difference in loads borne by the sensor housing 330 and the housing 10a. This allows the sensor housing 330 and the housing 10a to deform synchronously when subjected to pressure from the battery pack 400. Furthermore, the sensor housing 330 includes the aforementioned pressure-bearing portion 320 and a main housing portion 310. The sensing assembly 340 is disposed within and secured to the main housing portion 310.

[0181] Optionally, the sensor housing 330 and the housing 10a are made of the same material, for example, the sensor housing 330 and the housing 10a are both made of aluminum.

[0182] According to some embodiments of the present application, optionally, as shown in FIG8 , the sensor housing 330 has a preset shell wall 350 disposed opposite and exposed to the battery cell group 400. The outer surface of the preset shell wall 350 faces the battery cell group 400, and the sensing component 340 is disposed on the inner surface of the preset shell wall 350 facing away from the outer surface. The outer surface of the preset shell wall 350 is configured to withstand pressure applied by the battery cell 1.

[0183] The preset shell wall 350 can withstand the pressure of the battery cell group 400 and deform. The sensing component 340 will not be directly affected by the pressure of the battery cell group 400. The sensing component 340 can be used to sense the deformation of the preset shell wall 350, thereby improving the accuracy of the detection result of the pressure sensor 300.

[0184] According to some embodiments of the present application, optionally, as shown in Figures 10 and 13 , the sensing assembly 340 includes a positive electrode interface 341, a negative electrode interface 342, two detection interfaces 343, and two groups of stress resistors 344. The two groups of stress resistors 344 are fixed to the sensor housing 330. Each group of stress resistors 344 includes two stress resistors 344 connected in series. The two groups of stress resistors 344 are connected in parallel between the positive electrode interface 341 and the negative electrode interface 342. The two detection interfaces 343 are respectively connected between the two stress resistors 344 of the two groups of stress resistors 344.

[0185] The pressure sensor 300 includes a sensing assembly 340, which includes a positive electrode interface 341, a negative electrode interface 342, two detection interfaces 343, and two sets of stress resistors 344. Each set of stress resistors 344 includes two stress resistors 344 connected in series. The two sets of stress resistors 344 are connected in parallel between the positive electrode interface 341 and the negative electrode interface 342. The two detection interfaces 343 are connected between the two stress resistors 344 of the two sets of stress resistors 344, respectively.

[0186] Such a configuration allows the four stress resistors 344 to be connected according to the Wheatstone bridge principle, and the expansion degree and pressure value can be calculated based on the voltage difference Vs between the two detection interfaces 343, effectively reducing the impact of temperature fluctuations on the expansion degree and pressure measurement results. Specifically, the resistance values ​​of the four stress resistors 344 are recorded as R1, R2, R3 and R4 respectively. By setting R1, R2, R3 and R4 to R1 = R2 = R3 = R4 in the initial state, the bridge can be balanced and the voltage difference Vs measured between the two detection interfaces 343 is 0. When the temperature changes, R1, R2, R3 and R4 are affected by the temperature at the same time, and the voltage difference Vs between the two detection interfaces 343 remains 0, thereby reducing the impact of temperature on the expansion degree and pressure measurement results.

[0187] According to some embodiments of the present application, optionally, as shown in Figures 4 to 13, the battery 100a includes a housing 10a, a battery cell group 400, and a pressure sensor 300. The housing 10a defines a receiving cavity 101. The battery cell group 400 is disposed in the receiving cavity 101. The pressure sensor 300 is disposed in the housing 10a and at least partially exposed toward the battery cell group 400, for receiving and detecting pressure applied by the battery cell group 400 toward the housing 10a. The pressure sensor 300 includes a sensor housing 330 and a sensing component 340. The sensing component 340 is disposed inside the sensor housing 330 and fixed to the sensor housing 330. The sensor housing 330 is embedded in the housing 10a. The housing 10a defines a receiving slot 102. Each pressure sensor 300 is correspondingly disposed in a receiving slot 102, and at least a portion of the sensor housing 330 is exposed toward the battery cell group 400 through the receiving slot 102. The receiving groove 102 has an exposure opening 103 that connects to the receiving cavity 101 from the side of the housing 10a facing the battery cell stack 400. The sensor housing 330 has a sensing end face 301 facing the battery cell stack 400, and the sensing end face 301 is exposed to the battery cell stack 400 through the exposure opening 103. The sensing end face 301 is flush with the edge of the exposure opening 103. Alternatively, the sensing end face 301 protrudes beyond the edge of the exposure opening 103. The distance L1 between the sensing end face 301 and the plane containing the edge of the exposure opening 103 is less than or equal to 1 mm. The inner contour of the receiving groove 102 matches the outer contour of the pressure sensor 300. The receiving groove 102 includes a main groove 104 that connects to the exposure opening 103. The main groove 104 is located on the side of the exposure opening 103 facing away from the battery cell stack 400. The main groove 104 and the exposure opening 103 form a first support surface 105 at the junction, facing away from the receiving cavity 101. The sensor housing 330 includes a main housing portion 310 and a pressure-bearing portion 320. The sensing assembly 340 is disposed within and fixed to the main housing portion 310. The main housing portion 310 is housed in the main slot 104 and supported by the first support surface 105. At least a portion of the pressure-bearing portion 320 is located within the exposed opening 103. The pressure-bearing portion 320 has a sensing end surface 301. The main slot 104 includes a first slot section 1041 and a second slot section 1042. The first slot section 1041 is located on the side of the second slot section 1042 away from the battery cell pack 400. The radial dimension of the first slot section 1041 is greater than that of the second slot section 1042. Consequently, the connection between the first slot section 1041 and the second slot section 1042 forms a second support surface 106 facing away from the battery cell pack 400. The main housing portion 310 includes a mating portion 311 and a mounting portion 312. The mating portion 311 is connected between the pressure-bearing portion 320 and the mounting portion 312. The matching portion 311 is located in the second slot section 1042 and supported on the first support surface 105 . The mounting portion 312 is located in the first slot section 1041 and supported on the second support surface 106 .The battery cell pack 400 includes a top 410, side portions 420, and a bottom 430. The side portion 420 is connected between the top 410 and the bottom 430. The housing 10a includes an end plate 107 disposed opposite the side portion 420. The pressure sensor 300 is disposed on the end plate 107. The side portion 420 includes two first side portions 421 and two second side portions 422. The two first side portions 421 are disposed opposite each other, and the two second side portions 422 are disposed opposite each other. The two second side portions 422 are connected between the two first side portions 421. The battery cell pack 400 includes at least two battery cells 1, which are stacked along the arrangement direction D2 of the two second side portions 422. The end plate 107 is disposed opposite the second side portion 422. The battery cell pack 400 includes at least two battery cells 1. Each battery cell 1 includes a cell top 11, a cell side 12, and a cell bottom 13. The cell side 12 is connected between the cell top 11 and the cell bottom 13. The cell side portion 12 includes two first cell side portions 14 and two second cell side portions 15. The two first cell side portions 14 are disposed opposite each other, and the two second cell side portions 15 are disposed opposite each other. The two second cell side portions 15 are connected between the two first cell side portions 14, and the area of ​​the second cell side portions 15 is larger than that of the first cell side portions 14. At least two battery cells 1 are stacked along the stacking direction D3 with their second cell side portions 15 facing each other. The two second cell side portions 15 located in front and behind each other in the stacking direction D3 of the at least two battery cells 1 form two second side portions 422, respectively. The first cell side portions 14 are combined to form a first side portion 421, the cell top portions 11 are combined to form a top portion 410, and the cell bottom portions 13 form a bottom portion 430. The end plate 107 includes a pressure-bearing plate 1071 and a support plate 1072. The pressure-bearing plate 1071 is disposed opposite the side portion 420. The pressure-bearing plate 1071 is provided with a receiving groove 102 extending through both sides thereof. The support plate 1072 is connected to the side of the pressure-bearing plate 1071 facing away from the battery cell group 400 to block the receiving groove 102 on the side of the pressure-bearing plate 1071 facing away from the battery cell group 400. The pressure sensor 300 is accommodated in the receiving groove 102 and supported between the pressure-bearing plate 1071 and the support plate 1072. The thickness L2 of the pressure-bearing plate 1071 ranges from 3 mm to 20 mm. Holes 1073 are provided on the side of the support plate 1072 and / or the pressure-bearing plate 1071 facing away from the battery cell group 400. The housing 10a includes an upper cover plate 108 disposed opposite the top 410 and a bottom plate 109 disposed opposite the bottom 430. The end plate 107 is connected between the upper cover plate 108 and the bottom plate 109. One end of the end plate 107 is provided with an assembly hole 1074 and is connected to the upper cover plate 108 through the assembly hole 1074. The other end of the end plate 107 is provided with a buckle 1075 and is connected to the bottom plate 109 through the buckle 1075. There are multiple pressure sensors 300, and the multiple pressure sensors 300 are arranged at intervals on the housing 10a.The pressure sensor 300 includes a sensor housing 330 and a sensing assembly 340. The sensing assembly 340 is disposed within and fixed to the sensor housing 330. The difference between the elastic modulus of the sensor housing 330 and the elastic modulus of the housing 10a is less than or equal to 5%. The pressure sensor 300 includes the sensing assembly 340, which includes a positive terminal 341, a negative terminal 342, two detection terminals 343, and two sets of stress resistors 344. Each set of stress resistors 344 includes two stress resistors 344 connected in series, and the two sets of stress resistors 344 are connected in parallel between the positive terminal 341 and the negative terminal 342. The two detection terminals 343 are respectively connected between the two stress resistors 344 of the two sets of stress resistors 344.

[0188] According to some embodiments of the present application, as shown in FIG1 , an electrical device includes the battery 100 a described above. This configuration can reduce the operating risk of the electrical device by reducing the operating risk of the battery 100 a.

[0189] According to some embodiments of the present application, as shown in FIG14 , the pressure detection device 130 of the battery cell group 400 includes a housing 10a and a pressure sensor 300. The housing 10a is provided with a receiving cavity 101. The battery cell group 400 is disposed in the receiving cavity 101. The pressure sensor 300 is disposed in the housing 10a and is at least partially exposed toward the battery cell group 400, so as to receive and detect the pressure applied by the battery cell group 400 toward the housing 10a. The pressure sensor 300 includes a sensor housing 330 and a sensing component 340, and the sensing component 340 is disposed inside the sensor housing 330 and fixed to the sensor housing 330. The sensor housing 330 is embedded in the housing 10a.

[0190] Regarding the embodiment of the pressure detection device of the present application, please refer to the relevant content of the battery embodiment above, which will not be repeated here.

[0191] In summary, the embodiments of the present application can detect the pressure applied by the battery cell group 400 toward the outer shell 10a, so that the expansion of the battery cell 1 can be detected in time, so that timely measures can be taken to avoid risks. At the same time, by arranging the pressure sensor 300 on the outer shell 10a, and the pressure sensor 300 is at least partially exposed toward the battery cell group 400, part of the pressure applied by the battery cell group 400 toward the outer shell 10a is applied to the pressure sensor 300, and the other part is applied to the outer shell 10a through the inner surface of the outer shell 10a, thereby allowing the range of the pressure sensor 300 to be reduced, thereby improving the measurement accuracy of the pressure sensor 300 and reducing the volume of the pressure sensor 300. The pressure sensor 300 can also work together with the outer shell 10a to encapsulate the battery cell group 400. The presence of the pressure sensor 300 can make up for the structural deficiency and insufficient strength of the outer shell 10a at the position where the pressure sensor 300 is installed.

[0192] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery, characterized in that: include: The housing is provided with a receiving cavity; A battery cell group, arranged in the accommodation cavity; A pressure sensor is arranged in the shell and at least partially exposed toward the battery cell group, so as to receive and detect the pressure applied by the battery cell group toward the shell; the pressure sensor includes a sensor shell and a sensing component, the sensing component is arranged inside the sensor shell and fixed to the sensor shell; the sensor shell is embedded in the shell.

2. The battery according to claim 1, characterized in that The housing is provided with a receiving groove, each of the pressure sensors is correspondingly disposed in one of the receiving grooves, and at least a portion of the sensor housing is exposed toward the battery cell group through the receiving groove.

3. The battery according to claim 2, characterized in that The receiving groove has an exposure opening connected to the receiving cavity from a side of the housing toward the battery cell group, and the sensor housing has a sensing end surface facing the battery cell group, and the sensing end surface is exposed toward the battery cell group through the exposure opening.

4. The battery according to claim 3, characterized in that The sensing end surface is flush with the edge of the exposure opening; or, the sensing end surface protrudes outside the edge of the exposure opening.

5. The battery according to claim 4, characterized in that The spacing distance between the sensing end surface and the plane where the edge of the exposure opening is located is less than or equal to 1 mm.

6. The battery according to claim 3, characterized in that The inner contour of the receiving groove matches the outer contour of the pressure sensor.

7. The battery according to claim 6, characterized in that The receiving groove comprises a main groove connected to the exposure port, the main groove is located on a side of the exposure port away from the battery cell group, and the main groove and the exposure port form a first supporting table away from the receiving cavity at a connection point; The sensor housing includes a main shell portion and a pressure-bearing portion, the sensing component is arranged inside the main shell portion and fixed to the main shell portion, the main shell portion is accommodated in the main groove and supported on the first supporting table surface; at least part of the pressure-bearing portion is located at the exposed port, and the pressure-bearing portion has the sensing end face.

8. The battery according to claim 7, characterized in that The main groove includes a first groove section and a second groove section, the first groove section is located on a side of the second groove section away from the battery monomer group, the radial dimension of the first groove section is greater than the radial dimension of the second groove section, and a second supporting table surface away from the battery monomer group is formed at the connection between the first groove section and the second groove section; The main shell portion includes a matching portion and a mounting portion, wherein the matching portion is connected between the pressure-bearing portion and the mounting portion; the matching portion is located in the second groove section and supported on the first supporting table surface, and the mounting portion is located in the first groove section and supported on the second supporting table surface.

9. The battery according to any one of claims 1 to 8, characterized in that: The battery cell group includes at least two battery cells, and the at least two battery cells are stacked; the outer shell includes an end plate arranged on at least one side of the at least two battery cells along the stacking direction of the at least two battery cells, and the pressure sensor is arranged on the end plate; the end plate is arranged opposite to the battery cell group along the stacking direction of the at least two battery cells.

10. The battery according to claim 9, characterized in that Each of the battery cells comprises a cell top, a cell side and a cell bottom; the cell side is connected between the cell top and the cell bottom; the cell side comprises two first cell sides and two second cell sides, the two first cell sides are arranged back to back, the two second cell sides are arranged back to back, the two second cell sides are connected between the two first cell sides, and the area of ​​the second cell side is greater than that of the first cell side; the at least two battery cells are stacked in a manner that the second cell sides are opposite to each other, and the end plate is arranged opposite to the second cell side of the battery cell stacked on the outermost side.

11. The battery according to claim 9, characterized in that The end plate includes a pressure-bearing plate body and a supporting plate body; the pressure-bearing plate body is arranged opposite to the battery cell group along the stacking direction of the at least two battery cells; the pressure-bearing plate body is provided with a receiving groove running through both sides thereof, and the supporting plate body is connected to the side of the pressure-bearing plate body away from the battery cell group to block the receiving groove on the side of the pressure-bearing plate body away from the battery cell group; the pressure sensor is accommodated in the receiving groove and is at least partially supported between the pressure-bearing plate body and the supporting plate body.

12. The battery according to claim 11, characterized in that The thickness of the pressure-bearing plate body ranges from 3 mm to 20 mm.

13. The battery according to claim 11, characterized in that A hollow hole is provided on a side of the support plate and / or the pressure plate facing away from the battery cell group.

14. The battery according to claim 9, characterized in that The housing comprises an upper cover plate and a bottom plate which are arranged opposite to each other, and the end plate is connected between the upper cover plate and the bottom plate; one end of the end plate An assembly hole is provided and the end plate is connected to the upper cover plate through the assembly hole, and a buckle is provided at the other end of the end plate and is connected to the bottom plate through the buckle.

15. The battery according to any one of claims 1 to 8, characterized in that: There are multiple pressure sensors, and the multiple pressure sensors are arranged in the housing at intervals.

16. The battery according to any one of claims 1 to 8, characterized in that: A ratio of a difference between an elastic modulus of the sensor housing and an elastic modulus of the housing to the elastic modulus of the housing is less than or equal to 5 percent.

17. The battery according to any one of claims 1 to 8, characterized in that: The sensor housing has a preset shell wall that is arranged opposite to the battery cell group and exposed, and the outer surface of the preset shell wall faces the battery cell group. The sensing component is arranged on the inner surface of the preset shell wall away from its outer surface, and the outer surface of the preset shell wall is used to withstand the pressure applied by the battery cell.

18. The battery according to any one of claims 1 to 8, characterized in that: The sensing component includes a positive electrode interface, a negative electrode interface, two detection interfaces and two groups of stress resistors; the two groups of stress resistors are fixed to the sensor housing, each group of stress resistors includes two stress resistors connected in series, and the two groups of stress resistors are connected in parallel between the positive electrode interface and the negative electrode interface; the two detection interfaces are respectively connected between the two stress resistors of the two groups of stress resistors.

19. An electrical device, characterized in that: Comprising a battery as claimed in any one of claims 1 to 18.

20. A pressure detection device for a battery cell group, characterized in that: include: The housing is provided with a receiving cavity; the battery cell group is arranged in the receiving cavity; A pressure sensor is arranged in the shell and at least partially exposed toward the battery cell group, so as to receive and detect the pressure applied by the battery cell group toward the shell; the pressure sensor includes a sensor shell and a sensing component, the sensing component is arranged inside the sensor shell and fixed to the sensor shell; the sensor shell is embedded in the shell.

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