Battery cells, batteries, and power consuming devices

Abstract

The embodiments of the present application provide a battery cell, a battery, and a power consumption device. The battery cell includes a housing, an electrode assembly, and a detection member. The housing has a receiving chamber. The electrode assembly is accommodated in the receiving chamber. The detection member includes a sensor and a connection member, the sensor is connected to the housing by the connection member, and is used for detecting status information of the battery cell and generating a signal, and the connection member is used for transmitting the signal. The sensor detects the status information of the battery cell in real time, and adjusts the battery cell according to the status information of the battery cell, so as to improve the cycle characteristics of the battery cell, reduce safety risks, and extend the cycle life of the battery cell.

Description

[Technical field]

[0001] TECHNICAL FIELD This application relates to the field of batteries, and more particularly to battery cells, batteries, and power consuming devices. [Background technology]

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric motorcycles, electric cars, electric planes, electric boats, electric toy cars, electric toy boats, electric toy planes and power tools.

[0003] How to improve the safety of battery cells is one of the research issues in battery technology. Summary of the Invention [Problem to be solved by the invention]

[0004] The present application provides for battery cells, batteries, and power consuming devices that provide improved safety. [Means for solving the problem]

[0005] In a first aspect, an embodiment of the present application provides a battery cell including a housing, an electrode assembly, and a detection member. The housing has a receiving chamber. The electrode assembly is received in the receiving chamber. The detection member includes a sensor and a connection member, the sensor is connected to the housing by the connection member, the sensor is used to detect status information of the battery cell and generate a signal, and the connection member is used to transmit the signal.

[0006] The sensor can detect the state information of the battery cell in real time, adjust the battery cell according to the state information of the battery cell, improve the cycle characteristics of the battery cell, reduce safety risks, and extend the cycle life of the battery cell. The connecting member has both the function of fixing the sensor and the function of transmitting signals, thereby simplifying the structure of the battery cell and reducing the risk of damage to the sensor.

[0007] In some embodiments, the state information of the battery cell includes at least one of an internal air pressure of the battery cell, a temperature of the battery cell, a composition of an internal gas of the battery cell, and a deformation amount of the electrode assembly.

[0008] In some embodiments, the connecting member includes optical fiber. Optical fiber sensing technology has high sensitivity and allows real-time monitoring, and can provide timely warnings when a battery cell fails, making it easier to replace the failed battery cell, extending battery life, and reducing costs.

[0009] In some embodiments, the sensor includes at least one of a Bragg grating and a Fabry-Perot resonator. The Bragg grating can be used to easily test the internal temperature, stress, etc. of the battery cell. The Fabry-Perot resonator can be used as an air pressure sensor to accurately monitor the internal air pressure of the battery cell in real time.

[0010] In some embodiments, the housing includes a first wall having a first through hole communicating with the storage chamber, and the sensor is provided on a side of the first wall away from the storage chamber and configured to detect status information of the battery cell through the first through hole.

[0011] The sensor is provided on the outside of the first wall, which makes it easy to attach or replace the sensor, and simplifies the assembly process. The first through-hole is provided in the first wall, which makes it easy to detect internal state information of the battery cell by the sensor.

[0012] In some embodiments, the sensor faces the first through hole in the axial direction of the first through hole, and a detection signal from the sensor enters the storage chamber through the first through hole, thereby making it easy for the sensor to detect internal state information of the battery cell.

[0013] In some embodiments, the sensor is connected to the first wall and covers the first through-hole. By connecting the sensor to the first wall, the risk of the sensor shaking when the battery cell vibrates can be reduced, the stability of the sensor can be improved, and the detection accuracy of the sensor can be improved. By covering the first through-hole, the sensor can reduce the risk of electrolyte leaking from the first through-hole, thereby improving safety.

[0014] In some embodiments, the detection member further comprises a fixing member, and the connecting member is connected to the first wall by the fixing member.

[0015] In some embodiments, the fixing member has a surface facing the first wall abutting against the first wall, and a storage recess recessed from the surface facing the first wall of the fixing member, the storage recess communicating with the first through hole. The sensor is stored in the storage recess, and the connection member is connected to the fixing member and passes through the fixing member.

[0016] The fixing member protects the sensor from the outside, reduces the risk of the sensor being contaminated or damaged by foreign objects from the outside, and improves the accuracy of the sensor. The connecting member penetrates the fixing member so as to be connected to a device outside the fixing member.

[0017] In some embodiments, a second through hole is provided in the bottom wall of the storage recess, and the connection member penetrates the fixing member through the second through hole. The connection member that enters the storage recess through the second through hole lifts the sensor and connects it to the fixing member, thereby further improving the stability of the detection member.

[0018] In some embodiments, the detection member further includes a seal member connected to the hole wall of the second through hole and the connection member, and sealing the second through hole. The seal member seals the second through hole, thereby reducing the risk of the electrolyte leaking from the second through hole and improving safety. The seal member performs both a function of connecting the fixing member and the connection member and a sealing function, simplifying the structure of the detection member.

[0019] In some embodiments, the sealing member is adhered to the hole wall of the second through hole and the connecting member, which makes the adhesion process easier to carry out, reduces the risk of damaging the connecting member, and improves the accuracy of signal transmission.

[0020] In some embodiments, the fixing member is welded to the first wall, which increases the connection strength of the fixing member, improves the seal, and reduces the risk of electrolyte leaking through a slit between the fixing member and the first wall.

[0021] In some embodiments, a positioning recess is provided on a side of the first wall away from the storage chamber, and the first through hole penetrates a bottom wall of the positioning recess. At least a portion of the fixing member is received in the positioning recess.

[0022] The positioning recess plays a role of positioning when assembling the fixing member and the first wall, simplifying the assembly process and improving the assembly efficiency. The positioning recess can also accommodate at least a part of the fixing member, reduce the size of the fixing member protruding from the first wall, reduce the space occupied by the fixing member, and improve the energy density of the battery cell.

[0023] In some embodiments, the fixing member includes a fixing body and a flange surrounding the outside of the fixing body, the fixing body having a storage recess, at least a portion of the flange being stored in the positioning recess, and the outer peripheral surface of the flange being connected to a side wall of the positioning recess.

[0024] By providing the flange, the distance between the side wall of the positioning recess and the fixed body is increased, reducing the risk of damaging the fixed body when connecting the flange and the side wall of the positioning recess, and improving sealing performance.

[0025] In some embodiments, the flange abuts against the bottom wall of the positioning recess, thereby increasing the contact area between the first wall and the fixing member and improving the stability of the connection between the first wall and the fixing member.

[0026] In some embodiments, the storage recess is stepped and includes a first portion and a second portion, the second portion being located on a side away from the first through hole of the first portion. A cross section perpendicular to the axial direction of the first through hole of the first portion is smaller than a cross section perpendicular to the axial direction of the first through hole of the second portion. The sensor is stored in the second portion.

[0027] The second portion has a large cross-sectional area and provides a sufficient space to accommodate the sensor. By providing the accommodation recess in a stepped shape, the size of the opening of the accommodation recess close to the first through hole is reduced, and the contact area between the fixed body and the first wall is increased, improving stability.

[0028] In some embodiments, the housing further comprises an electrode terminal disposed on the first wall, the electrode assembly comprises a tab, and the electrode terminal is electrically connected to the tab, and in a direction perpendicular to the first wall, an end of the fixing member away from the first wall does not extend beyond the electrode terminal.

[0029] In the above technical solution, a fixing member is provided in the space occupied by the electrode terminal in the direction perpendicular to the first wall, thereby preventing the fixing member from increasing the size of the battery cell in the direction perpendicular to the first wall, and improving the space utilization rate and energy density of the battery cell.

[0030] In some embodiments, the battery cell is configured to inject an electrolyte solution through the first through hole, and the first through hole is used as an injection hole for the battery cell and is sealed with a detection member, thereby reducing the number of holes in the housing and eliminating the need for a typical sealing sheet, thereby simplifying the structure of the battery cell.

[0031] In some embodiments, the housing has a through hole communicating with the storage chamber, the sensor is stored in the storage chamber, and at least a portion of the connection member is stored in the through hole and connected to the housing.

[0032] By providing the sensor in the storage chamber, the utilization rate of the internal space of the battery cell is improved, and the accuracy of detection of internal state information of the battery cell by the sensor is improved. By providing the drawer through hole, at least a part of the connection member is exposed, which is advantageous for the connection member to transmit a signal to the outside of the housing.

[0033] In some embodiments, the detection member further includes a seal member that connects the hole wall of the drawn through hole with the connection member and seals the drawn through hole. The seal member seals the drawn through hole, thereby reducing the risk of electrolyte leaking from the drawn through hole and improving safety. The seal member performs both the function of connecting the hole wall of the drawn through hole with the connection member and the sealing function, thereby simplifying the structure of the detection member.

[0034] In some embodiments, the sensor is provided with an insulating layer on the surface facing the electrode assembly, which reduces the risk of the sensor conducting between the positive and negative electrode sheets when the battery cell vibrates, thereby improving safety.

[0035] In some embodiments, the housing includes a first wall, and the sensor is located on a side of the first wall facing the electrode assembly and spaced apart from the first wall. Spaced apart from the first wall, the sensor provides a movement space for the sensor, reduces the force that is applied to the connection between the sensor and the connection member when the battery cell vibrates, and reduces the risk of the connection between the sensor and the connection member becoming loose, thereby improving the safety of the battery cell.

[0036] In some embodiments, the battery cell is configured to inject electrolyte through the drawn-out through-hole. By using the drawn-out through-hole as an injection hole for the battery cell and sealing the first through-hole with a detection member, the number of holes in the housing is reduced and a typical sealing sheet is omitted, simplifying the structure of the battery cell.

[0037] In some embodiments, the battery cell further includes an insulating member provided on a surface of the first wall facing the electrode assembly. The sensor is located on a side of the insulating member away from the first wall. The insulating member is provided with a first escape hole facing the draw-out through hole, and the connection member extends into the draw-out through hole through the first escape hole.

[0038] The insulating member insulates the first wall from the electrode assembly, thereby reducing the risk of the first wall conducting electricity between the positive and negative electrodes of the electrode assembly, and improving safety. The provision of the first escape hole reduces the risk of interference between the insulating member and the connecting member.

[0039] In some embodiments, the insulating member is spaced apart from the sensor, which provides a movement space for the sensor, reduces the force that is applied to the connection between the sensor and the connection member when the battery cell vibrates, reduces the risk of the connection between the sensor and the connection member becoming loose, and improves the safety of the battery cell.

[0040] In some embodiments, a portion of the connection member extends outside the housing through the withdrawal through hole, thereby facilitating connection of the connection member to equipment external to the housing.

[0041] In some embodiments, the housing includes a case having an opening and an end cover for covering the opening. The end cover is a first wall of the housing. The end cover is thicker than the case, and the detection member is provided on the end cover, so that the detection member is stably supported and the stability of the detection member is improved.

[0042] In some embodiments, the housing includes an electrode terminal, the electrode assembly includes a tab, and the electrode terminal is electrically connected to the tab. The lead-out through-hole is provided in the electrode terminal, and the sensor is provided on a side of the electrode terminal facing the electrode assembly. By providing the lead-out through-hole in the electrode terminal, the space utilization rate of the battery cell is improved.

[0043] In some embodiments, the battery cell further includes an adapter member for connecting the tab and the electrode terminal. The adapter member includes a terminal connection portion that abuts against a surface of the electrode terminal that faces the electrode assembly, and the terminal connection portion is provided with a second escape hole that faces the drawn-out through-hole. The sensor is provided on a side of the terminal connection portion that is away from the electrode terminal, and the connection member extends into the drawn-out through-hole through the second escape hole. By providing the second escape hole, the risk of the adapter member interfering with the connection member is reduced, and the connection member can smoothly extend into the drawn-out through-hole.

[0044] In some embodiments, the terminal connection is spaced apart from the sensor, which provides a movement space for the sensor, reduces the force that the connection between the sensor and the connection member receives when the battery cell vibrates, reduces the risk of the connection between the sensor and the connection member becoming loose, and improves the safety of the battery cell.

[0045] In some embodiments, the connection member does not protrude from the surface of the electrode terminal facing away from the electrode assembly. The surface of the electrode terminal facing away from the electrode assembly is usually connected to the bus bar member, and the above technical solution reduces the risk that the connection member will interfere with the bus bar member.

[0046] In some embodiments, the adapter member includes an adapter body and an adapter protrusion, the adapter body is connected to the tab, and the adapter protrusion protrudes from a surface of the adapter body facing the electrode terminal. The adapter member has an adapter recess formed at a position corresponding to the adapter protrusion, and a terminal connection portion is formed on a bottom wall of the adapter recess. The sensor is housed in the adapter recess. By providing the sensor in the adapter recess, space utilization can be improved. The sensor is restricted by the sidewall of the adapter recess, thereby reducing the vibration amplitude of the sensor when the battery cell vibrates.

[0047] In some embodiments, the battery cells are cylindrical battery cells or prismatic battery cells.

[0048] In a second aspect, embodiments of the present application provide a battery including a plurality of battery cells according to any of the embodiments of the first aspect.

[0049] In a third aspect, embodiments of the present application provide a power consumption device including a battery cell according to any of the embodiments of the first aspect for supplying electrical energy. [Brief description of the drawings]

[0050] In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings that need to be used in the embodiments of the present application will be briefly described below, but the drawings described below are only some embodiments of the present application, and it is obvious to those skilled in the art that other drawings can be obtained based on the drawings without requiring creative efforts. The drawings may not be drawn to actual scale. [Figure 1] 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application. [Diagram 2] FIG. 2 is a schematic disassembly diagram of a battery according to some embodiments of the present application. [Diagram 3] 1 is a schematic diagram of the three-dimensional structure of a battery cell according to some embodiments of the present application. [Figure 4] FIG. 4 is a schematic cross-sectional view of the battery cell shown in FIG. [Diagram 5] FIG. 5 is an enlarged schematic view of a portion A in a circle in FIG. [Figure 6] FIG. 2 is a partial cross-sectional schematic diagram of a battery cell according to another embodiment of the present application. [Figure 7] FIG. 2 is a partial cross-sectional schematic diagram of a battery cell according to another embodiment of the present application. [Figure 8] FIG. 2 is a schematic cross-sectional view of a battery cell according to another embodiment of the present application. [Figure 9] FIG. 2 is a schematic diagram of the three-dimensional structure of a battery cell according to another embodiment of the present application. [Figure 10] FIG. 10 is a schematic cross-sectional view of the battery cell shown in FIG. [Figure 11] FIG. 2 is a schematic diagram of the three-dimensional structure of a battery cell according to another embodiment of the present application. [Figure 12] 12 is a schematic cross-sectional view of the battery cell shown in FIG. 11. [Figure 13] FIG. 13 is an enlarged schematic view of a portion B in a circle in FIG. [Figure 14] FIG. 2 is a schematic cross-sectional view of a battery cell according to another embodiment of the present application. [Figure 15] FIG. 2 is a schematic cross-sectional view of a battery cell according to another embodiment of the present application. [Figure 16] FIG. 16 is an enlarged schematic view of a portion C in a circle in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0051] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are explicitly described below with reference to the drawings of the embodiments of the present application, but it is clear that the described embodiments are only a part of the embodiments of the present application, and are not all of the embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without paying creative efforts all belong to the protection scope of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the art. In this application, the terms used in the specification of the application are used only to describe certain embodiments and are not intended to limit the application. The terms "include" and "have" and their variations in the specification, claims, and above description of the drawings of this application are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification, claims, and above drawings of this application are intended to distinguish different objects, and are not intended to describe a specific order or primary and secondary relationships.

[0053] When an "embodiment" is described herein, it means that a particular feature, structure, or characteristic described with reference to the embodiment may be included in at least one embodiment of the application. The appearances of the phrases in various places in the specification do not necessarily refer to the same embodiment, or to separate or alternative embodiments that are mutually exclusive of other embodiments.

[0054] In the present description, unless otherwise clearly specified or limited, the terms "attach," "connect," "join," and "assemble" should be understood in a broad sense, and may refer to, for example, a fixed connection, a removable connection, or an integral connection, or may refer to a direct connection, an indirect connection via an intermediate medium, or an internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this specification may be understood according to the specific situation.

[0055] The term "and / or" in this application merely describes the relation between related objects, and means that there are three relations, for example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the sign " / " in this application generally represents that the related objects before and after it are in an "or" relation.

[0056] In the embodiments of the present application, the same reference numerals represent the same elements, and detailed descriptions of the same elements in different embodiments are omitted for brevity. It should be understood that the dimensions of various elements in the embodiments of the present application, such as thickness, length, width, etc., and the dimensions of the entire integrated device, such as thickness, length, width, etc., shown in the accompanying drawings, are merely illustrative, and the present application should not be construed as limiting in any way.

[0057] As used herein, "plurality" means two or more (including two).

[0058] In the present application, the battery cell may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, etc., and the embodiments of the present application are not limited thereto. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shape, and the embodiments of the present application are not limited thereto.

[0059] In the present application, the battery cell may include, but is not limited to, a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, etc. The shape of the battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc., but is not limited to the above in the embodiments of the present application.

[0060] A battery as referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, a battery as referred to in this application may include a battery module or a battery pack. A battery usually includes a box for packaging one or more battery cells. The box prevents liquids and other foreign objects from affecting the charging or discharging of the battery cells.

[0061] The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell is mainly operated by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, and the positive electrode active material layer is applied to the surface of the positive electrode collector. The positive electrode collector includes a positive electrode application area and a positive electrode tab connected to the positive electrode application area, and the positive electrode active material layer is applied to the positive electrode application area, and the positive electrode tab is not applied to the positive electrode active material layer. Taking a lithium-ion battery cell as an example, the material of the positive electrode collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is applied to the surface of the negative electrode collector, the negative electrode collector includes a negative electrode application area and a negative electrode tab connected to the negative electrode application area, the negative electrode active material layer is applied to the negative electrode application area, and the negative electrode tab is not applied with the negative electrode active material layer. The material of the negative electrode collector may be copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon, silicon, or the like. The material of the separator may be polypropylene (PP) or polyethylene (PE), or the like.

[0062] The battery cell further includes a housing, and a receiving chamber is formed inside the housing to receive the electrode assembly. The housing protects the electrode assembly from the outside and prevents external foreign objects from affecting the charging or discharging of the electrode assembly.

[0063] During the cycle of the battery cell, abnormalities may occur. For example, when the battery cell is repeatedly charged and discharged, side reactions may occur inside the battery cell, which may continuously generate gas. The gas may increase the internal air pressure of the battery cell, which may cause the housing to deform or explode. In addition, for example, when a short circuit occurs inside the battery cell, heat may be generated in the battery cell, which may cause the temperature to rise, which may cause the battery cell to go into thermal runaway.

[0064] When a battery is used, if an abnormality in a battery cell is not detected and dealt with in a timely manner, the battery cell will deteriorate and cause a safety accident.

[0065] The inventor attempted to provide a detection member on the circuit board of the battery to detect the operating state of the battery cells in real time and determine whether an abnormality occurred in the battery cells, but found that due to the limited space on the circuit board, it was not possible to detect the battery cells individually, resulting in deviations in the detection results.

[0066] In view of this, the embodiments of the present application provide a technical solution for improving the cycle characteristics of the battery cell, reducing safety risks, and extending the cycle life of the battery cell by integrating a detection component in the battery cell, detecting status information for each battery cell in real time, and adjusting the battery cell according to the status information of the battery cell.

[0067] The technical solutions described in the embodiments of the present application are suitable for batteries and battery-powered power-consuming devices.

[0068] The power consuming device may be a vehicle, a mobile phone, a portable device, a laptop, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gasoline vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extending vehicle, etc. The spacecraft may include an aircraft, a rocket, a space shuttle, a spaceship, etc. The electric toy may include a game console, an electric car toy, an electric ship toy, an electric plane toy, or other stationary or mobile electric toy. The electric tool may include an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a metal cutting power tool such as a concrete vibrator, a planer, a grinding power tool, an assembly power tool, and a railway power tool. The embodiment of the present application does not particularly limit the above power consuming device.

[0069] For convenience of explanation, the following embodiment will be described taking a case where the power consuming device is a vehicle as an example.

[0070] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application.

[0071] 1, a battery 2 is provided inside the vehicle 1, and the battery 2 may be provided at the bottom, head, or tail of the vehicle 1. The battery 2 is used to power the vehicle 1, and can function as an operating power source for the vehicle 1, for example.

[0072] The vehicle 1 may further include a controller 3 and a motor 4, where the controller 3 is used to control the battery 2 to power the motor 4, for example for power consumption for starting the vehicle 1, navigation and operation during driving.

[0073] In some embodiments of the present application, the battery 2 may not only serve as the operating power source for the vehicle 1, but may also serve as the propulsion power source for the vehicle 1, providing propulsion power to the vehicle 1 in place of or in part in place of fuel oil or natural gas.

[0074] FIG. 2 is a schematic diagram of an exploded view of a battery according to some embodiments of the present application.

[0075] As shown in FIG. 2, the battery 2 includes a case 5 and a battery cell 6 (not shown), and the battery cell 6 is housed in the case 5.

[0076] The box 5 is used to store the battery cells 6, and the box 5 may have various structures. In some embodiments, the box 5 may include a first box part 5a and a second box part 5b, and the first box part 5a and the second box part 5b are fitted together, and a storage space 5c for storing the battery cells 6 is defined by both the first box part 5a and the second box part 5b. The second box part 5b may have a hollow structure with one end open, and the first box part 5a may have a plate-like structure, and the first box part 5a is fitted to the open side of the second box part 5b to form the box 5 having the storage space 5c. The first box part 5a and the second box part 5b may also have a hollow structure with one end open, and the open side of the first box part 5a is fitted to the open side of the second box part 5b to form the box 5 having the storage space 5c. Of course, the first box portion 5a and the second box portion 5b may have various shapes, such as a cylindrical body or a rectangular parallelepiped.

[0077] In order to improve the sealing performance between the first box body portion 5a and the second box body portion 5b after connection, a sealing member such as a sealant or a seal ring may be provided between the first box body portion 5a and the second box body portion 5b.

[0078] When the first box body part 5a is fitted to the top of the second box body part 5b, the first box body part 5a may be called an upper cover, and the second box body part 5b may be called a lower box.

[0079] The battery 2 may have one or more battery cells 6. When there are multiple battery cells 6, the multiple battery cells 6 may be connected in series, in parallel, or in series-parallel, and a series-parallel connection means that some of the multiple battery cells 6 are connected in series and some are connected in parallel. The multiple battery cells 6 may be directly connected in series, in parallel, or in series-parallel, and then the multiple battery cells 6 may be integrated and stored in the box 5. Of course, the multiple battery cells 6 may be connected in series, in parallel, or in series-parallel to form a battery module, and then the multiple battery modules may be connected in series, in parallel, or in series-parallel to form an integrated battery module, and stored in the box 5.

[0080] FIG. 3 is a schematic diagram of the three-dimensional structure of a battery cell according to some embodiments of the present application, FIG. 4 is a schematic cross-sectional view of the battery cell shown in FIG. 3, and FIG. 5 is an enlarged schematic view of a portion A enclosed in a circle in FIG.

[0081] 3 to 5, an embodiment of the present application provides a battery cell 6 including a housing 20, an electrode assembly 10, and a detection member 30. The housing 20 has a storage chamber 20a. The electrode assembly 10 is accommodated in the storage chamber 20a. The detection member 30 is connected to the housing 20 and detects state information of the battery cell 6.

[0082] The housing 20 has a hollow structure with an interior serving as a storage chamber 20a for storing the electrode assembly 10 and the electrolyte. The shape of the housing 20 may be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 has a rectangular parallelepiped structure, a rectangular parallelepiped housing may be selected, and if the electrode assembly 10 has a cylindrical structure, a cylindrical housing may be selected.

[0083] The material of the housing 20 can be various, such as metal, plastic, etc. Alternatively, the material of the housing 20 can be copper, iron, aluminum, steel, and aluminum.

[0084] The electrode assembly 10 includes a positive electrode sheet and a negative electrode sheet. As an example, the electrode assembly 10 generates electrical energy through oxidation and reduction reactions when ions are absorbed / released in the positive electrode sheet and the negative electrode sheet. Optionally, the electrode assembly 10 further includes a separator for insulatingly separating the positive electrode sheet and the negative electrode sheet.

[0085] The electrode assembly 10 may be a wound electrode assembly, a stacked electrode assembly, or other type of electrode assembly.

[0086] There may be one or more electrode assemblies 10. When there are multiple electrode assemblies 10, the multiple electrode assemblies 10 may be arranged in a stack.

[0087] The status information of the battery cell 6 is information that represents the operating state of the battery cell 6, and as an example, the status information of the battery cell 6 may include at least one of status information such as the internal air pressure of the battery cell, the temperature of the battery cell, the composition of the internal gas of the battery cell, the amount of deformation of the electrode assembly, the amount of deformation of the housing, the status of dendrite growth inside the electrode assembly, and the amount of power inside the battery cell.

[0088] The detection member 30 may be provided entirely inside the housing 20, or entirely outside the housing 20. Alternatively, a portion of the detection member 30 may be provided inside the housing 20 and another portion may be provided outside the housing 20.

[0089] The detection member 30 may be directly connected to the housing 20 or indirectly connected to the housing 20 through another element.

[0090] In the embodiment of the present application, the detection member 30 is integrated in the battery cell 6, detects the status information of the battery cell 6 in real time, and adjusts the battery cell 6 according to the status information of the battery cell 6, thereby improving the cycle characteristics of the battery cell 6, reducing safety risks, and extending the cycle life of the battery cell 6.

[0091] In some embodiments, the detection member 30 includes a sensor 31 and a connecting member 32, the sensor 31 is connected to the housing 20 by the connecting member 32 and is used to detect the status information of the battery cell 6 and generate a signal, and the connecting member 32 is used to transmit the signal.

[0092] The sensor 31 may be a resistive sensor, an inductive sensor, a capacitive sensor, a piezoelectric sensor, a magnetoelectric sensor, a pyroelectric sensor, a photoelectric sensor, a digital sensor, a fiber optic sensor, an ultrasonic sensor, a thermal sensor, or other type of sensor.

[0093] The detection member 30 may have one or more sensors 31.

[0094] The sensor 31 may be provided inside the storage chamber 20 a of the housing 20 or outside the housing 20 .

[0095] The connection member 32 may be directly connected to the housing 20, or may be indirectly connected to the housing 20 via another member. The sensor 31 is fixed to the housing 20 by the connection member 32.

[0096] The connection member 32 may be used to transmit signals. For example, the connection member 32 may transmit a signal from the sensor 31 to a data processing unit of the battery, and may transmit a signal from the data processing unit to the sensor 31. For example, the transmission of signals between the connection member 32 and the data processing unit may be performed via a cable or may be realized by wireless transmission technology.

[0097] In the embodiment of the present application, the sensor 31 detects the status information of the battery cell 6 in real time, and adjusts the battery cell 6 according to the status information of the battery cell 6, thereby improving the cycle characteristics of the battery cell 6, reducing safety risks, and extending the cycle life of the battery cell 6. The connection member 32 can perform both the function of fixing the sensor 31 and the function of transmitting signals, thereby simplifying the structure of the battery cell 6 and reducing the risk of damage to the sensor 31.

[0098] In some embodiments, the status information of the battery cell 6 may include at least one of the internal air pressure of the battery cell, the temperature of the battery cell, the composition of the internal gas of the battery cell, and the deformation amount of the electrode assembly.

[0099] As an example, the sensor 31 may include a temperature sensor, which is provided outside the housing 20 and in contact with the housing 20 to detect the temperature of the housing 20. Alternatively, the temperature sensor may be provided inside the storage chamber 20a of the housing 20 to detect the temperature inside the battery cell 6.

[0100] As an example, the sensor 31 may include a hydrogen sensor. The hydrogen sensor 31 may be provided in the storage chamber 20a of the housing 20 to detect the hydrogen component inside the battery cell 6. Alternatively, the hydrogen sensor may be provided outside the housing 20, and a channel may be opened in the housing 20, so that the gas inside the battery cell 6 may act on the hydrogen sensor through the channel.

[0101] Of course, the sensor 31 may include other sensors that detect other constituents.

[0102] As an example, the sensor 31 may include an air pressure sensor. The air pressure sensor may be provided in the storage chamber 20a of the housing 20 to detect the internal air pressure of the battery cell 6. Alternatively, the air pressure sensor may be provided outside the housing 20, and a channel may be opened in the housing 20, so that the gas inside the battery cell 6 may act on the air pressure sensor through the channel.

[0103] As an example, the sensor 31 may include a displacement sensor. The displacement sensor may be provided in the storage chamber 20a of the housing 20 and may be in contact with the electrode assembly 10. The displacement sensor may measure the amount of expansion and deformation of the electrode assembly 10 during charging and discharging.

[0104] As an example, the sensor 31 may include a stress sensor that can be inserted between the positive and negative electrode sheets of the electrode assembly 10 to measure changes in stress between the positive and negative electrode sheets.

[0105] In some embodiments, the connection member 32 comprises an optical fiber. As an example, the optical fiber and the sensor 31 comprise a fiber optic sensor.

[0106] The core of optical fiber sensing technology is an optical fiber, a thin glass wire, through which light waves can propagate through the center of the optical fiber. Optical fiber is mainly composed of three parts: the core, the cladding, and the protective layer. Among them, the cladding can reflect stray light waves emitted from the core back to the core, minimizing the transmission loss of light waves within the core. The principle behind this function is that the optical refractive index of the core is higher than that of the cladding, so total reflection occurs when the light wave propagates from the core to the cladding. The outermost protective layer plays a protective role to prevent damage to the optical fiber caused by the external environment or external forces.

[0107] The optical fiber has a diameter of 10μm~10mm, is made of high-purity quartz glass or all-plastic optical fiber, and can be customized in length as needed. The material of the outer protective layer of the optical fiber is acrylate, silicone rubber, nylon, polyimide, etc.

[0108] Optical fiber sensing technology is highly sensitive and can achieve real-time monitoring, so it can immediately issue an alarm if there is a problem with a battery cell 6, making it easy to replace the problematic battery cell 6, extending the battery life and reducing costs.

[0109] In some embodiments, the sensor 31 includes at least one of a Bragg grating and a Fabry-Perot cavity.

[0110] FBG stands for Fiber Bragg Grating, a spatial phase periodic grating formed within the core of an optical fiber, essentially forming a narrow band filter and reflector within the core of the optical fiber.

[0111] Fiber Bragg Grating (FBG) sensors are the most frequently used and most widely used fiber optic sensors. They can change the wavelength of light they reflect based on changes in ambient temperature or strain. Fiber Bragg Gratings use holographic interferometry or phase masking techniques to expose a short section of photosensitive optical fiber to light waves with a periodic distribution of light intensity. In this way, the refractive index of the optical fiber changes permanently depending on the intensity of the light waves irradiated on it. The periodic change in the refractive index of light induced by this method is called a Fiber Bragg Grating.

[0112] When a broad-spectrum beam of light propagates through a fiber Bragg grating, each section of fiber, after which the refractive index of the light changes, reflects only light waves of a specific wavelength, called the Bragg wavelength. This property allows fiber Bragg gratings to reflect only light waves of a specific wavelength and transmit light waves of other wavelengths.

[0113] Tilted Bragg fiber gratings have been the focus of research on optical fiber sensors in recent years. They use optical methods to form tilted Bragg fiber gratings on the fiber core, which can break the cylindrical symmetry of the mode coupling process and promote light coupling from the fiber core to different cladding modes. The spectrum of this fiber grating sensor is a comb spectrum with excellent narrowband resonance peaks, which makes it a high-precision measurement tool for monitoring various small modulation changes. The cut-off mode of the cladding mode of the tilted Bragg fiber grating has a high optical field intensity of the evanescent wave, a large penetration depth, and a very high sensitivity to changes in the refractive index of the environment. Therefore, the cut-off mode can be used to measure the refractive index of the external environment, the growth of dendrites, etc., and can be used to measure the growth of dendrites on the surface of the internal electrodes of batteries with high precision.

[0114] By providing the Bragg grating, changes in temperature, stress, etc. inside the battery cell 6 can be easily tested.

[0115] A Fabry-Pérot cavity, also known as a Fabry-Pérot cavity, is a type of optical resonant cavity that consists of two parallel plane mirrors and is commonly used in semiconductor lasers.

[0116] From basic principles, fiber optic sensors change one or more properties of the propagating light waves, such as intensity, phase, polarization state, frequency, etc., in response to changes in the external environmental parameters under test. Non-intrinsic (hybrid) fiber optic sensors use only optical fiber as the transmission medium for light waves between the instrument and the sensing element, whereas intrinsic fiber optic sensors use the optical fiber itself as the sensing element.

[0117] In optics, a Fabry-Pérot cavity interferometer is a multi-beam interferometer consisting of two parallel glass plates with highly reflective inner surfaces facing each other. Fabry-Pérot interferometers are often called Fabry-Pérot resonators, FP resonators, or Fabry-Pé resonators, and when the two glass plates are held together by a hollow spacer of fixed length, they are sometimes called Fabry-Pérot etalons, or simply etalons. However, these terms are not strictly used interchangeably. The characteristic of this interferometer is that when the frequency of the incident light satisfies the resonance condition, its transmission spectrum has a very high peak, corresponding to a very high transmittance. The resonance characteristics of the Fabry-Pérot interferometer are the same as those used in dichroic filters.

[0118] By providing a Fabry-Perot resonator as an air pressure sensor, the internal air pressure of the battery cell 6 can be accurately monitored in real time.

[0119] In some embodiments, the housing 20 includes a case 21 having an opening and an end cover 22 for covering the opening.

[0120] The case 21 and the end cover 22 define a storage chamber 20a.

[0121] The case 21 may have various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism shape, etc. Specifically, the shape of the case 21 may be determined according to the specific shape and size of the electrode assembly 10. The case 21 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., but the embodiments of the present application are not particularly limited thereto.

[0122] The shape of the end cover 22 may be adapted to the shape of the case 21 so as to fit with the case 21. Optionally, the end cover 22 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength. In this case, the end cover 22 is less likely to deform even when subjected to extrusion or impact, so that the battery cells 6 have higher structural strength and improved safety. The end cover 22 is connected to the case 21 by welding, adhesion, engagement, or other means.

[0123] Case 21 may have a structure that is open on one side, and one end cover 22 is provided and fitted to the opening of case 21. Alternatively, case 21 may have a structure that is open on both sides, and two end covers 22 are provided, and the two end covers 22 are fitted to the two openings of case 21, respectively.

[0124] In some embodiments, the battery cell 6 is a cylindrical battery cell. As an example, the housing 20 of the battery cell 6 is cylindrical in shape.

[0125] In some embodiments, the battery cells 6 are prismatic battery cells. In one example, the housing 20 of the battery cells 6 is a rectangular parallelepiped shape.

[0126] In some embodiments, the housing 20 includes a first wall 20b having a first through-hole 221 communicating with the storage chamber 20a. The sensor 31 is located on the side of the first wall 20b away from the storage chamber 20a and is configured to detect status information of the battery cell 6 through the first through-hole 221.

[0127] The first wall 20b may be the end cover 22 or may be a part of the case 21.

[0128] The number of first through-holes 221 may be one or more.

[0129] Providing the sensor 31 on the outside of the first wall 20b facilitates attachment or modification of the sensor 31 and simplifies the assembly process. Opening the first through-hole 221 in the first wall 20b enables the sensor 31 to detect internal state information of the battery cell 6.

[0130] As an example, the sensor 31 can detect the air pressure, temperature, gas composition, or other state information inside the battery cell 6.

[0131] In some embodiments, the sensor 31 faces the first through-hole 221 in the axial direction X of the first through-hole 221 .

[0132] In the axial direction X of the first through-hole 221, the projection of the sensor 31 and the projection of the first through-hole 221 at least partially overlap.

[0133] The sensor 31 may close the first through hole 221. Alternatively, the sensor 31 may be provided at a distance from the first through hole 221 in the axial direction X of the first through hole 221.

[0134] A detection signal (for example, light) from the sensor 31 can enter the storage chamber 20a through the first through-hole 221. This makes it easier for the sensor 31 to detect internal state information of the battery cell 6.

[0135] In some embodiments, the detection member 30 further includes a fixing member 33, and the connecting member 32 is connected to the first wall 20b by the fixing member 33.

[0136] The fastening member 33 may be secured to the first wall 20b by welding, adhesion, engagement or other means.

[0137] The connecting member 32 may be directly connected to the fixing member 33, or may be indirectly connected to the fixing member 33 via another element. As an example, the connecting member 32 may be adhered with an adhesive, or may be integrated with the fixing member 33 by hot melt molding.

[0138] As an example, the fixing member 33, the sensor 31, and the connecting member 32 of the detection member 30 may be pre-assembled. When assembling the detection member 30 and the housing 20, it is only necessary to fix the fixing member 33 to the first wall 20b of the housing 20.

[0139] In some embodiments, the fixing member 33 has a surface facing the first wall 20b that abuts against the first wall 20b, and is provided with a storage recess 331 recessed from the surface of the fixing member 33 facing the first wall 20b, and the storage recess 331 communicates with the first through-hole 221. The sensor 31 is stored in the storage recess 331, and the connection member 32 is connected to the fixing member 33 and passes through the fixing member 33.

[0140] The connection member 32 may penetrate through the bottom wall of the storage recess 331 or through the side wall of the storage recess 331.

[0141] The fixing member 33 protects the sensor 31 from the outside, reduces the risk of the sensor 31 being contaminated or damaged by foreign objects from the outside, and improves the accuracy of the sensor 31. The connecting member 32 penetrates the fixing member 33 to be connected to a device outside the fixing member 33.

[0142] In some embodiments, a second through-hole 332 is provided in the bottom wall of the storage recess 331 , and the connection member 32 penetrates the fixing member 33 through the second through-hole 332 .

[0143] The sensor 31 is pulled up and connected to the fixing member 33 by the connecting member 32 that has entered the storage recess 331 via the second through hole 332, and the stability of the detection member 30 is further improved.

[0144] As an example, the connection member 32 may be connected to the side of the sensor 31 away from the first through-hole 221 .

[0145] As an example, the connecting member 32 may have a flexible structure. Since the connecting member 32 can pull up the sensor 31, the flexible connecting member 32 can also fix the sensor 31. Since the flexible connecting member 32 is deformable, it is easy to connect it to other members.

[0146] In some embodiments, the detection member 30 further includes a sealing member 34 that connects the hole wall of the second through-hole 332 and the connection member 32 and seals the second through-hole 332 .

[0147] The sealing member 34 may connect the hole wall of the second through hole 332 and the connecting member 32 by adhesion, interference fit, welding or other means.

[0148] The seal member 34 seals the second through hole 332, thereby reducing the risk of the electrolyte leaking from the second through hole 332 and improving safety. The seal member 34 performs both a function of connecting the fixing member 33 and the connecting member 32 and a sealing function, and simplifies the structure of the detection member 30.

[0149] In some embodiments, the sealing member 34 is adhered to the wall of the second through hole 332 and the connecting member 32 .

[0150] As an example, an adhesive may be filled between the wall of the second through-hole 332 and the connection member 32, and the adhesive may be cured to form the seal member .

[0151] The adhesion process is easier to carry out, the risk of damaging the connection member 32 is reduced, and the accuracy of signal transmission is improved.

[0152] In some embodiments, the fixing member 33 is welded to the first wall 20b, which increases the connection strength of the fixing member 33, improves the seal, and reduces the risk of electrolyte leaking through the slit between the fixing member 33 and the first wall 20b.

[0153] In some embodiments, the fixing member 33 may be a metal member or a plastic member. Optionally, the fixing member 33 is a metal member because it has high strength and can stably support the connecting member 32 and the sensor 31.

[0154] In some embodiments, a positioning recess 222 is provided on the side of the first wall 20b away from the storage chamber 20a, and the first through hole 221 penetrates the bottom wall of the positioning recess 222. At least a portion of the fixing member 33 is housed in the positioning recess 222.

[0155] The positioning recess 222 plays a role in positioning when assembling the fixing member 33 and the first wall 20b, simplifying the assembly process and improving the assembly efficiency. The positioning recess 222 can also accommodate at least a part of the fixing member 33, reduce the size of the fixing member 33 protruding from the first wall 20b, reduce the space occupied by the fixing member 33, and improve the energy density of the battery cell 6.

[0156] In some embodiments, the fixing member 33 includes a fixing body 333 and a flange 334 surrounding the outside of the fixing body 333. The fixing body 333 is provided with a receiving recess 331, and at least a portion of the flange 334 is received in the positioning recess 222, and the outer circumferential surface of the flange 334 is connected to the side wall of the positioning recess 222.

[0157] By providing the flange 334, the distance between the side wall of the positioning recess 222 and the fixed body 333 is increased, reducing the risk of damaging the fixed body 333 when connecting the flange 334 and the side wall of the positioning recess 222, and improving sealing performance.

[0158] As an example, a laser may be applied to the boundary between the flange 334 and the side wall of the positioning recess 222 to weld the flange 334 to the side wall of the positioning recess 222. By providing the flange 334, the distance between the side wall of the positioning recess 222 and the fixed body 333 becomes large, and the risk of the fixed body 333 interfering with the welding device is reduced.

[0159] In some embodiments, the flange 334 abuts against the bottom wall of the positioning recess 222. This increases the contact area between the first wall 20b and the fixing member 33, thereby improving the stability of the connection between the first wall 20b and the fixing member 33.

[0160] In some embodiments, the flange 334 and the fixing body 333 are adhered to the bottom wall of the positioning recess 222 .

[0161] In some embodiments, the surface of the flange 334 facing the bottom wall of the positioning recess 222 and the surface of the fixing body 333 facing the bottom wall of the positioning recess 222 are at the same height.

[0162] In some embodiments, the end cover 22 is the first wall 20b of the housing 20. The end cover 22 is thicker than the case 21, and the detection member 30 is provided on the end cover 22, whereby the detection member 30 is stably supported and the stability of the detection member 30 is improved.

[0163] In some embodiments, the battery cell 6 is configured to inject an electrolyte through the first through-hole 221 .

[0164] In the manufacturing process of the battery cell, it is necessary to inject the electrolyte into the inside of the housing. To inject the electrolyte, it is common to open an inlet hole in the battery cell. After the process related to the inlet hole is completed, it is necessary to provide a seal sheet on the housing to seal the inlet hole.

[0165] In the embodiment of the present application, the first through hole 221 is used as a liquid injection hole for the battery cell 6, and the first through hole 221 is sealed with a detection member 30, thereby reducing the number of holes in the housing 20 and eliminating the need for a normal sealing sheet, thereby simplifying the structure of the battery cell 6.

[0166] FIG. 6 is a partial cross-sectional schematic diagram of a battery cell according to another embodiment of the present application.

[0167] 6, in some embodiments, the storage recess 331 is stepped and includes a first portion 331a and a second portion 331b, with the second portion 331b located on the side of the first portion 331a that is away from the first through hole 221. A cross section of the first portion 331a perpendicular to the axial direction X of the first through hole 221 is smaller than a cross section of the second portion 331b perpendicular to the axial direction X of the first through hole 221. The sensor 31 is stored in the second portion 331b.

[0168] The second portion 331b has a large cross-sectional area and provides a sufficient space for storing the sensor 31. By providing the storage recess 331 in a stepped shape, the size of the opening of the storage recess 331 close to the first through-hole 221 is reduced, and further the contact area between the fixed body 333 and the first wall 20b is increased, improving stability.

[0169] In some embodiments, the fixing body 333 may be adhered to the first wall 20b. The receiving recess 331 is provided in a stepped shape, so that the adhesion area between the fixing body 333 and the first wall 20b is increased.

[0170] FIG. 7 is a partial cross-sectional schematic diagram of a battery cell according to another embodiment of the present application.

[0171] As shown in FIG. 7, in some embodiments, the sensor 31 is connected to the first wall 20b and covers the first through-hole 221.

[0172] Connecting the sensor 31 to the first wall 20b reduces the risk of the sensor 31 shaking when the battery cell 6 vibrates, improves the stability of the sensor 31, and improves the detection accuracy of the sensor 31. By covering the first through-hole 221, the sensor 31 reduces the risk of the electrolyte leaking from the first through-hole 221, thereby improving safety.

[0173] In some embodiments, the sensor 31 is adhered to the first wall 20b.

[0174] FIG. 8 is a schematic cross-sectional view of a battery cell according to another embodiment of the present application.

[0175] 8, in some embodiments, the housing 20 further includes an electrode terminal 23 provided on the first wall 20b, the electrode assembly 10 includes a tab 11, and the electrode terminal 23 is electrically connected to the tab 11. In a direction perpendicular to the first wall 20b, an end of the fixing member 33 away from the first wall 20b does not extend beyond the electrode terminal 23.

[0176] The electrode terminals 23 are used to electrically connect the electrode assembly 10 to a circuit external to the battery cell 6 and enable charging and discharging of the electrode assembly 10. Optionally, the electrode terminals 23 are connected to bus bar members and are used to enable electrical connection between the battery cells 6.

[0177] As an example, the electrode terminal 23 may protrude from an outer surface of the first wall 20b away from the storage chamber 20a to facilitate connection between the electrode terminal 23 and the bus bar member and to reduce the risk of the first wall 20b interfering with the bus bar member.

[0178] In the embodiment of the present application, a fixing member 33 may be provided in the space occupied by the electrode terminal 23 in the direction perpendicular to the first wall 20b. In other words, the fixing member 33 prevents the size of the battery cell 6 from increasing in the direction perpendicular to the first wall 20b, and improves the space utilization rate and energy density of the battery cell 6.

[0179] In some embodiments, battery cells 6 are prismatic battery cells.

[0180] FIG. 9 is a schematic diagram of the three-dimensional structure of a battery cell according to another embodiment of the present application, and FIG. 10 is a schematic cross-sectional view of the battery cell shown in FIG.

[0181] As shown in FIGS. 9 and 10, in some embodiments, the battery cells 6 are cylindrical battery cells.

[0182] In some embodiments, cylindrical battery cells may utilize the same sensing elements as prismatic battery cells.

[0183] In some embodiments, the housing 20 of the battery cell 6 may include a top wall, a side wall, and a bottom wall, where the side wall is cylindrical and the top and bottom walls are both disk-shaped and connected to opposite ends of the side wall. Optionally, the first wall 20b may be the top wall or the bottom wall.

[0184] 11 is a schematic diagram of the three-dimensional structure of a battery cell according to another embodiment of the present application, FIG. 12 is a schematic cross-sectional view of the battery cell shown in FIG. 11, and FIG. 13 is an enlarged schematic view of the circled portion B in FIG.

[0185] 11 to 13, in some embodiments, the housing 20 is provided with a drawer through-hole 40 that communicates with the storage chamber 20a. The sensor 31 is stored in the storage chamber 20a, and at least a portion of the connection member 32 is stored in the drawer through-hole 40 and connected to the housing 20.

[0186] The connecting member 32 may or may not extend to the outside of the housing 20 through the withdrawal through hole 40 .

[0187] Providing the sensor 31 in the storage chamber 20a improves the utilization rate of the internal space of the battery cell 6, and improves the accuracy with which the sensor 31 detects internal state information of the battery cell 6. Providing the drawer through-hole 40 exposes at least a portion of the connection member 32, which is advantageous for the connection member 32 to transmit a signal to the outside of the housing 20.

[0188] In some embodiments, the connection member 32 is located on the side of the sensor 31 facing the withdrawal through-hole 40 .

[0189] In some embodiments, the detection member 30 further includes a seal member 34 that connects the hole wall of the draw-out through-hole 40 and the connection member 32 and seals the draw-out through-hole 40 .

[0190] The seal member 34 may be connected to the hole wall of the draw through hole 40 and to the connecting member 32 by adhesive, an interference fit, welding or other means.

[0191] The seal member 34 seals the drawn-out through-hole 40, thereby reducing the risk of electrolyte leaking from the drawn-out through-hole 40 and improving safety. The seal member 34 performs both the function of connecting the hole wall of the drawn-out through-hole 40 and the connection member 32 and the sealing function, thereby simplifying the structure of the detection member 30.

[0192] In some embodiments, the sealing member 34 is adhered to the wall of the draw-out through-hole 40 and the connecting member 32. As an example, an adhesive may be filled between the wall of the draw-out through-hole 40 and the connecting member 32, and the adhesive may be cured to form the sealing member 34.

[0193] In some embodiments, the sensor 31 is provided with an insulating layer 35 on the side facing the electrode assembly 10 .

[0194] By providing the insulating layer 35, the risk of the sensor 31 causing electrical conduction between the positive electrode sheet and the negative electrode sheet when the battery cell 6 vibrates is reduced, improving safety.

[0195] In some embodiments, the sensor 31 may be provided with an insulating layer 35 on another side thereof. For example, the sensor 31 may be provided with an insulating layer 35 on the side facing away from the electrode assembly 10. As an example, the insulating layer 35 may be formed by spraying an insulating material onto the surface of the sensor 31.

[0196] In some embodiments, the housing 20 includes a first wall 20b, and the sensor 31 is located on a side of the first wall 20b facing the electrode assembly 10 and spaced apart from the first wall 20b.

[0197] The first wall 20b may be the end cover 22, or may be a part of the case 21. As an example, the first wall 20b is the end cover 22.

[0198] If the sensor 31 comes into contact with the first wall 20b, stress concentration occurs at the connection portion between the sensor 31 and the connection member 32 when the battery cell 6 vibrates, and there is a possibility of a risk of the connection between the sensor 31 and the connection member 32 failing. In the embodiment of the present application, the sensor 31 is provided at a distance from the first wall 20b, thereby providing space for the sensor 31 to move, reducing the force received by the connection portion between the sensor 31 and the connection member 32 when the battery cell 6 vibrates, reducing the risk of the connection between the sensor 31 and the connection member 32 failing, and improving the safety of the battery cell 6.

[0199] In some embodiments, the connecting member 32 may be adhered to the first wall 20b or may be integral to the first wall 20b by hot melt molding.

[0200] In some embodiments, the battery cells 6 are configured to inject an electrolyte through the draw-out through-holes 40 .

[0201] By using the draw-out through-hole 40 as an inlet for the battery cell 6 and sealing the first through-hole 221 with the detection member 30, the number of holes in the housing 20 is reduced and the usual sealing sheet is omitted, simplifying the structure of the battery cell 6.

[0202] In some embodiments, the battery cell 6 further includes an insulating member 50 provided on a surface of the first wall 20b facing the electrode assembly 10. The sensor 31 is located on a side of the insulating member 50 away from the first wall 20b. The insulating member 50 is provided with a first escape hole 51 facing the draw-out through-hole 40, and the connection member 32 extends to the draw-out through-hole 40 through the first escape hole 51.

[0203] In the axial direction Y of the drawn-out through-hole 40, the first escape hole 51 and the drawn-out through-hole 40 at least partially overlap.

[0204] The insulating member 50 electrically separates the first wall 20b from the electrode assembly 10, thereby reducing the risk that the first wall 20b will conduct electricity between the positive and negative electrodes of the electrode assembly 10, thereby improving safety. The first escape hole 51 is provided to reduce the risk that the insulating member 50 will interfere with the connection member 32.

[0205] In some embodiments, the insulating member 50 is spaced apart from the sensor 31 .

[0206] By providing the sensor 31 with a gap between it and the insulating member 50, space for the sensor 31 to move is provided, and the force received by the connection portion between the sensor 31 and the connecting member 32 when the battery cell 6 vibrates is reduced, thereby reducing the risk of the connection between the sensor 31 and the connecting member 32 becoming lost, and improving the safety of the battery cell 6.

[0207] In some embodiments, a portion of the connecting member 32 extends outside the housing 20 through the exit through hole 40 .

[0208] By way of example, the connecting member 32 protrudes from an outer surface of the housing 20. Optionally, the connecting member 32 protrudes from an outer surface of the first wall 20b.

[0209] The connection member 32 extends to the outside of the housing 20. This makes it easy for the connection member 32 to be connected to an external device of the housing 20.

[0210] FIG. 14 is a schematic cross-sectional view of a battery cell according to another embodiment of the present invention.

[0211] As shown in FIG. 14, in some embodiments, the battery cells 6 are cylindrical battery cells.

[0212] In some embodiments, the housing 20 is provided with a drawer through-hole 40 that communicates with the storage chamber 20a. The sensor 31 is stored in the storage chamber 20a, and at least a portion of the connection member 32 is stored in the drawer through-hole 40 and connected to the housing 20.

[0213] FIG. 15 is a cross-sectional schematic diagram of a battery cell according to another embodiment of the present application, and FIG. 16 is an enlarged schematic diagram of a portion C enclosed in a circle in FIG.

[0214] 15 and 16 , in some embodiments, the housing 20 includes the electrode terminal 23, the electrode assembly 10 includes the tab 11, and the electrode terminal 23 is electrically connected to the tab 11. The lead-out through-hole 40 is provided in the electrode terminal 23, and the sensor 31 is provided on the side of the electrode terminal 23 facing the electrode assembly 10.

[0215] The electrode terminal 23 may be attached to the end cover 22, or may be attached to the case 21. As an example, the electrode terminal 23 is attached to the end cover 22.

[0216] By providing the electrode terminals 23 with the draw-out through-holes 40, the space utilization rate of the battery cells 6 is improved.

[0217] The electrode terminal 23 has a strength greater than that of the case 21 and the end cover 22. By providing the lead-out through-hole 40 in the electrode terminal 23, the stability of the detection member 30 can be improved.

[0218] In some embodiments, the connection members 32 may be adhered to the electrode terminals 23 or may be integrated into the electrode terminals 23 by melt hot molding.

[0219] In some embodiments, the battery cell 6 further includes an adapter member 60 for connecting the tab 11 and the electrode terminal 23. The adapter member 60 includes a terminal connection portion 611 that abuts against a surface of the electrode terminal 23 that faces the electrode assembly 10, and the terminal connection portion 611 is provided with a second escape hole 612 that faces the drawn-out through-hole 40. The sensor 31 is provided on the side of the terminal connection portion 611 that is away from the electrode terminal 23, and the connection member 32 extends into the drawn-out through-hole 40 through the second escape hole 612.

[0220] In the axial direction Y of the drawn through hole 40, the second escape hole 612 and the drawn through hole 40 at least partially overlap.

[0221] By providing the second escape hole 612, the risk of the adapter member 60 interfering with the connection member 32 is reduced, and the connection member 32 can be smoothly extended into the drawing through hole 40.

[0222] In some embodiments, the terminal connection 611 is spaced apart from the sensor 31 .

[0223] By providing the sensor 31 with a gap between it and the terminal connection portion 611, movement space is provided for the sensor 31, and the force received by the connection portion between the sensor 31 and the connection member 32 when the battery cell 6 vibrates is reduced, thereby reducing the risk of the connection between the sensor 31 and the connection member 32 becoming lost, and improving the safety of the battery cell 6.

[0224] In some embodiments, the connecting member 32 does not protrude from the face of the electrode terminal 23 facing away from the electrode assembly 10 .

[0225] The surface of the electrode terminal 23 that is away from the electrode assembly 10 is usually connected to the bus bar member. In the embodiment of the present application, the risk that the connection member 32 will interfere with the bus bar member is reduced.

[0226] In some embodiments, the adapter member 60 includes an adapter body 62 and an adapter protrusion 61, the adapter body 62 is connected to the tab 11, and the adapter protrusion 61 protrudes from a surface of the adapter body 62 facing the electrode terminal 23. The adapter member 60 has an adapter recess 63 formed at a position corresponding to the adapter protrusion 61, and a terminal connection portion 611 formed on a bottom wall of the adapter recess 63. The sensor 31 is stored in the adapter recess 63.

[0227] Space utilization can be improved by providing the sensor 31 in the adapter recess 63. The sensor 31 is restricted by the sidewall of the adapter recess 63, so that when the battery cell 6 vibrates, the vibration amplitude of the sensor 31 is reduced.

[0228] In some embodiments, the terminal connection portion 611 is welded to the electrode terminal 23. By providing the adapter recess 63, the thickness of the terminal connection portion 611 is reduced, and the difficulty of welding the terminal connection portion 611 and the electrode terminal 23 is reduced.

[0229] According to some embodiments of the present application, the present application further provides a battery including a plurality of the battery cells according to any of the above embodiments.

[0230] According to some embodiments of the present application, the present application also provides a power consuming device including a battery cell according to any of the above embodiments for supplying electrical energy to the power consuming device, the power consuming device being a device or system using any of the battery cells.

[0231] As shown in Figs. 3 to 5, a battery cell 6 according to an embodiment of the present application is a rectangular battery cell 6 including a housing 20, an electrode assembly 10, and a detection member 30. The housing 20 includes a case 21 having an opening, and an end cover 22 for covering the opening. A storage chamber 20a is defined by the case 21 and the end cover 22. The electrode assembly 10 is housed in the storage chamber 20a. The end cover 22 is provided with a first through hole 221 that communicates with the storage chamber 20a.

[0232] The detection member 30 includes a sensor 31, a connection member 32, and a fixing member 33. The connection member 32 includes an optical fiber, and is connected to the sensor 31, thereby constituting the optical fiber sensor 31 together with the sensor 31.

[0233] The surface of the fixing member 33 facing the end cover 22 abuts against the end cover 22, and the fixing member 33 is welded to the end cover 22. The fixing member 33 is provided with a storage recess 331 recessed from the surface of the fixing member 33 facing the end cover 22, and the storage recess 331 communicates with the first through hole 221. A second through hole 332 is provided in the bottom wall of the storage recess 331. The sensor 31 is stored in the storage recess 331, and the connection member 32 is connected to the fixing member 33 and passes through the second through hole 332.

[0234] The sensor 31 is used to detect the status information of the battery cell 6 and generate a signal, and the connection member 32 is used to transmit the signal.

[0235] Furthermore, where no contradiction exists, the embodiments and features of the embodiments of the present application may be combined with each other.

[0236] It should be noted that the above examples are only used to explain the technical solutions of the present application, and are not intended to limit the same. Although the present application has been described in detail with reference to the above examples, those skilled in the art may still modify the technical solutions described in the above examples or replace some of the technical features thereof with equivalents, but it should be understood that such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the respective embodiments of the present application.

Claims

1. A battery cell, a housing having a storage chamber; an electrode assembly housed in the housing; a detection member including a sensor and a connection member; The sensor is connected to the housing by the connection member, the sensor is used to detect status information of the battery cell and generate a signal, and the connection member is used to transmit the signal. Battery cell.

2. The state information of the battery cell includes at least one of an internal air pressure of the battery cell, a temperature of the battery cell, a composition of an internal gas of the battery cell, and a deformation amount of the electrode assembly. The battery cell according to claim 1 .

3. The connection member includes an optical fiber. The battery cell according to claim 1 or 2.

4. the sensor includes at least one of a Bragg grating and a Fabry-Perot resonator; The battery cell according to any one of claims 1 to 3.

5. the housing includes a first wall having a first through hole communicating with the storage chamber; the sensor is provided on a side of the first wall away from the storage chamber and is configured to detect state information of the battery cell through the first through hole. The battery cell according to any one of claims 1 to 4.

6. The sensor faces the first through hole in an axial direction of the first through hole. The battery cell according to claim 5 .

7. The sensor is connected to the first wall and covers the first through hole. The battery cell according to claim 6 .

8. The detection member further includes a fixing member, and the connection member is connected to the first wall by the fixing member. The battery cell according to claim 5 or 6.

9. the fixing member has a surface facing the first wall that abuts against the first wall, and a storage recess is provided in the surface facing the first wall of the fixing member, the storage recess being in communication with the first through hole; The sensor is accommodated in the accommodation recess, and the connection member is connected to the fixing member and passes through the fixing member. The battery cell of claim 8 .

10. a second through hole is provided in a bottom wall of the storage recess, and the connection member penetrates the fixing member through the second through hole; The battery cell of claim 9 .

11. The detection member further includes a seal member that connects a hole wall of the second through hole and the connection member and seals the second through hole. The battery cell of claim 10.

12. The sealing member is adhered to a wall of the second through hole and the connecting member. The battery cell of claim 11.

13. The fastening member is welded to the first wall. The battery cell according to any one of claims 9 to 12.

14. A positioning recess is provided on a side of the first wall away from the storage chamber, and the first through hole penetrates a bottom wall of the positioning recess, At least a portion of the fixing member is housed in the positioning recess. The battery cell according to any one of claims 9 to 13.

15. The fixing member includes a fixing body and a flange surrounding the outside of the fixing body, the fixing body is provided with the accommodation recess, at least a portion of the flange is accommodated in the positioning recess, and an outer peripheral surface of the flange is connected to a side wall of the positioning recess. The battery cell of claim 14.

16. The flange abuts against a bottom wall of the positioning recess. The battery cell of claim 15.

17. The storage recess has a stepped shape and includes a first portion and a second portion, the second portion being located on a side of the first portion that is away from the first through hole, a cross section perpendicular to the axial direction of the first through hole of the first portion is smaller than a cross section perpendicular to the axial direction of the first through hole of the second portion; The sensor is housed in the second portion. The battery cell according to any one of claims 9 to 16.

18. the housing further includes an electrode terminal disposed on the first wall, the electrode assembly including a tab, the electrode terminal being electrically connected to the tab; an end of the fixing member away from the first wall does not extend beyond the electrode terminal in a direction perpendicular to the first wall; The battery cell according to any one of claims 9 to 17.

19. An electrolyte is injected through the first through hole. The battery cell according to any one of claims 5 to 18.

20. The housing is provided with a drawer through hole communicating with the storage chamber, The sensor is accommodated in the accommodation chamber, and at least a portion of the connection member is accommodated in the draw-out through-hole and connected to the housing. The battery cell according to any one of claims 1 to 4.

21. The detection member further includes a seal member that connects a hole wall of the pull-out through hole and the connection member and seals the pull-out through hole.

21. The battery cell of claim 20.

22. The sensor has an insulating layer on a surface facing the electrode assembly.

22. The battery cell according to claim 20 or 21.

23. the housing includes a first wall, the sensor being located on a side of the first wall facing the electrode assembly and spaced apart from the first wall; The battery cell according to any one of claims 20 to 22.

24. An electrolyte is injected through the extraction through hole.

24. The battery cell of claim 23.

25. The electrode assembly further includes an insulating member provided on a surface of the first wall facing the electrode assembly, the sensor is located on a side of the insulating member that is away from the first wall, the insulating member is provided with a first escape hole that faces the draw-out through hole, and the connecting member extends into the draw-out through hole through the first escape hole; 25. The battery cell according to claim 23 or 24.

26. The insulating member is provided at a distance from the sensor.

26. The battery cell of claim 25.

27. A portion of the connection member extends to the outside of the housing through the withdrawal through hole. The battery cell according to any one of claims 23 to 26.

28. The housing includes a case having an opening and an end cover for covering the opening, the end cover being a first wall of the housing. The battery cell according to any one of claims 5 to 19 and 23 to 27.

29. the housing includes an electrode terminal, the electrode assembly includes a tab, the electrode terminal is electrically connected to the tab, the through-hole is provided in the electrode terminal, and the sensor is provided on a side of the electrode terminal facing the electrode assembly; The battery cell according to any one of claims 20 to 22.

30. an adapter member for connecting the tab and the electrode terminal; the adapter member includes a terminal connection portion that abuts against a surface of the electrode terminal that faces the electrode assembly, and the terminal connection portion is provided with a second escape hole that faces the lead-out through hole; the sensor is provided on a side of the terminal connection portion away from the electrode terminal, and the connection member extends into the drawing through hole through the second escape hole; 30. The battery cell of claim 29.

31. The terminal connection portion is provided at a distance from the sensor.

31. The battery cell of claim 30.

32. the connecting member does not protrude from a surface of the electrode terminal that faces away from the electrode assembly; 32. The battery cell according to claim 30 or 31.

33. the adapter member includes an adapter body and an adapter protrusion, the adapter body is connected to the tab, and the adapter protrusion protrudes from a surface of the adapter body facing the electrode terminal; The adapter member has an adapter recess formed at a position corresponding to the adapter protrusion, and the terminal connection portion is formed on a bottom wall of the adapter recess. The sensor is housed in the adapter recess. The battery cell according to any one of claims 30 to 32.

34. The battery cell is a cylindrical battery cell or a rectangular battery cell. The battery cell according to any one of claims 1 to 33.

35. A battery cell according to any one of claims 1 to 34, battery.

36. A battery cell according to any one of claims 1 to 34 for supplying electrical energy. Power consuming device.

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