Battery cell, battery device and power utilization device

Abstract

The utility model discloses a battery cell, a battery device and a power utilization device. The battery cell comprises a shell, the pole core is positioned in the shell; the sensing unit is located in the shell, and the first end of the sensing unit is electrically connected with the first pole of the pole core; the first end of the on-off unit is electrically connected with the second end of the sensing unit, and the second end of the on-off unit is electrically connected with the second pole of the pole core. According to the battery cell, the battery device and the power utilization device, the battery cell can be smoothly subjected to a high-voltage impact step without causing damage to the sensing unit.

Description

Technical Field

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

[0002] At present, a sensor unit is usually provided in a battery cell to detect the parameters inside the battery cell. The sensor unit is directly connected to the positive and negative electrodes of the battery cell to complete the internal power supply.

[0003] If such a battery cell undergoes a high-voltage impact (hi-pot) process, the sensor unit will face the risk of high-voltage breakdown. If the high-voltage impact process is not performed, it will be difficult to detect short-circuited batteries during the preparation stage, which will not only cause safety problems in subsequent processes or use, but also cause a waste of production resources.

[0004] Therefore, improvements are needed to at least partially solve the above problems. Utility Model Content

[0005] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of the utility model does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0006] In order to at least partially solve the above problems, according to a first aspect of the present utility model, a battery cell is provided, comprising:

[0007] case;

[0008] A pole core, located inside the shell;

[0009] A sensor unit is located inside the housing, and a first end of the sensor unit is electrically connected to a first pole of the pole core;

[0010] A switching unit, wherein a first end of the switching unit is electrically connected to a second end of the sensing unit, and a second end of the switching unit is electrically connected to a second pole of the pole core.

[0011] Exemplarily, the on-off unit includes a switch body and a control assembly;

[0012] The first end of the switch body is electrically connected to the second end of the sensor unit, and the second end of the switch body is electrically connected to the second pole of the pole core;

[0013] The control component is connected to the switch body and is used to control the on and off of the switch body.

[0014] Exemplarily, the switch body is located outside the housing, and the second end of the switch body is electrically connected to the second pole of the pole core outside the housing.

[0015] Exemplarily, the control component includes a wireless signal receiving module and a controller;

[0016] The switch body, the wireless signal receiving module and the controller are all located inside the housing;

[0017] The wireless signal receiving module is used to receive a control signal from outside the housing;

[0018] The controller is connected to the switch body and the wireless signal receiving module, and is used to control the on and off of the switch body according to the control signal.

[0019] Exemplarily, the wireless signal receiving module includes at least one of a magnetic induction module, a Bluetooth module, an NFC module and a WIFI module.

[0020] Exemplarily, a through hole is provided on the housing;

[0021] The on-off unit includes a first pin and a second pin, the first pin and the second pin are inserted into the through hole, the first end of the first pin is located inside the shell and is electrically connected to the second end of the sensor unit, the first end of the second pin is located inside the shell and is electrically connected to the second pole of the pole core, and the second end of the first pin and the second end of the second pin are both located outside the shell and are welded.

[0022] Exemplarily, the battery cell further includes a protective cover, a circumferential edge of which is connected to the housing and covers the through hole, the second end of the first pin, and the second end of the second pin.

[0023] Exemplarily, the sensing unit includes a sensor and a digital-to-analog conversion module;

[0024] The sensor is connected to the digital-to-analog conversion module;

[0025] The digital-to-analog conversion module is electrically connected to the first pole of the pole core, and is electrically connected to the second pole of the pole core through the on-off unit. The digital-to-analog conversion module is used to convert the digital signal output by the sensor into an analog signal, and superimpose the analog signal on the first and second poles of the pole core.

[0026] Exemplarily, the sensor includes at least one of a voltage sensor, a temperature sensor, a pressure sensor, a stress sensor, and a gas sensor.

[0027] Exemplarily, the sensor comprises a gas sensor;

[0028] The battery cell further includes a semipermeable membrane and a plastic package. The semipermeable membrane covers the gas sensor, and the plastic package covers the sensing unit and at least partially exposes the semipermeable membrane.

[0029] Exemplarily, the battery cell also includes a hard PCB, which is located inside the shell, and the sensing unit and the on-off unit are both arranged on the hard PCB. The first end of the hard PCB is electrically connected to the first pole of the pole core through a wire, and the second end of the hard PCB is electrically connected to the second pole of the pole core through a wire.

[0030] Exemplarily, the battery cell also includes an FPC, which is located inside the shell, the sensing unit and the switching unit are both arranged on the FPC, the first end of the FPC is electrically connected to the first pole of the pole core, and the second end of the FPC is electrically connected to the second pole of the pole core.

[0031] According to a second aspect of the present invention, a battery device is provided, which includes the battery cell described above.

[0032] According to a third aspect of the present invention, an electrical device is provided, which includes the battery device or the battery cell as described above.

[0033] According to the battery cell, battery device and power-consuming device of the utility model, the electrical connection between the second end of the sensing unit and the second pole of the pole core can be disconnected by the on-off unit before the high-voltage process step, and the electrical connection between the second end of the sensing unit and the second pole of the pole core can be connected by the on-off unit after the high-voltage process step. Thus, the sensor unit can be effectively prevented from being damaged by the high-voltage impact process step, the safety of the battery cell can be guaranteed, and the waste of production resources can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The following drawings of the present application are hereby used as part of the present application for understanding the present application. The drawings show the embodiments of the present application and their descriptions, and are used to explain the device and principle of the present application. In the drawings,

[0035] Figure 1 is a schematic structural block diagram of a battery cell according to the first embodiment of the present application;

[0036] Figure 2 is a schematic exploded diagram of a battery cell according to the first embodiment of the present application;

[0037] Figure 3 is a schematic structural block diagram of a battery cell according to a second embodiment of the present application;

[0038] Figure 4 Schematic exploded view of a partial structure of a battery cell according to the second embodiment of the present application.

[0039] Description of reference numerals:

[0040] 100-shell, 100'-shell, 1110-aluminum shell, 120-first cover plate, 120'-first cover plate, 121-positive pole, 122-through hole, 130-second cover plate, 131-negative pole, 200-pole core, 310-on-off unit, 310'-on-off unit, 311-switch body, 312-wireless signal receiving module, 313-controller, 314-first pin, 315-second pin, 320-sensing unit, 321-power supply module, 322-digital-to-analog conversion module, 323-voltage sensor, 324-temperature sensor, 325-pressure sensor, 326-stress sensor, 327-gas sensor, 400-FPC, 500-hard PCB, 600-protective cover. DETAILED DESCRIPTION

[0041] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0042] It should be understood that the present application can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0043] It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as a second element, component, region, layer or part.

[0044] Spatially relative terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used herein for convenience of description to describe the relationship of one element or feature to other elements or features shown in the figures. It should be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation shown in the figures.

[0045] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present application. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0046] Embodiments of the utility model are described herein with reference to cross-sectional views as schematic diagrams of ideal embodiments (and intermediate structures) of the present application. In this way, variations in the shapes shown due to, for example, manufacturing techniques and / or tolerances can be expected. Therefore, the embodiments of the present application should not be limited to the specific shapes shown herein, but include shape deviations due to, for example, manufacturing. Therefore, what is shown in the figures is schematic in nature, and their shapes are not intended to display the actual shape of the device and are not intended to limit the scope of the present application.

[0047] See attached Figure 1 , 2 The battery cell according to the first embodiment of the present application is exemplarily described. The battery cell includes a housing 100 , a pole core 200 , a switching unit 310 and a sensor unit 320 .

[0048] The housing 100 is used to accommodate the pole core 200, the switching unit 310 and the sensor unit 320. Figure 1 In this embodiment, the housing 100 includes an aluminum shell 110, a first cover plate 120 and a second cover plate 130. The aluminum shell 110 is in a hollow cylindrical shape, which is closed on all sides and has openings at both ends. The first cover plate 120 and the second cover plate 130 are respectively connected to the openings at both ends of the aluminum shell 110. An accommodating space for accommodating the pole core 200, the on-off unit 310 and the sensor unit 320 is formed between the aluminum shell 110, the first cover plate 120 and the second cover plate 130. A first pole is provided on the first cover plate 120, and a second pole is provided on the second cover plate 130. The first pole can be a positive pole 121, and the second pole can be a negative pole 131.

[0049] The pole core 200 is located inside the housing 100, that is, in the accommodation space. The pole core 200 includes a positive pole sheet, a negative pole sheet and a separator, wherein the positive pole sheet, the negative pole sheet and the separator can be arranged in a stacked form or in a wound form. The pole core 200 also includes a positive pole ear and a negative pole ear, wherein the positive pole ear is connected to the positive pole sheet and connected to the positive pole column 121 through a first connecting sheet, and the negative pole ear is connected to the negative pole sheet and connected to the negative pole column 131 through a second connecting sheet.

[0050] The sensing unit 320 is located inside the housing 100 and is used to detect parameters inside the housing 100. The sensing unit 300 includes the sensing unit 320 and the switching unit 310. The first end of the sensing unit 320 is electrically connected to the first pole of the pole core 200.

[0051] The first end of the on-off unit 310 is electrically connected to the second end of the sensing unit 320, and the second end of the on-off unit 310 is electrically connected to the second pole of the pole core 200. The on-off unit 310 is used to disconnect the electrical connection between the second end of the sensing unit 320 and the second pole of the pole core 200 before the high-voltage impact step is performed on the battery cell, and to connect the electrical connection between the second end of the sensing unit 320 and the second pole of the pole core 200 after the high-voltage impact step is performed.

[0052] In this embodiment, the first pole of the pole core 200 may be the positive pole of the pole core 200, and the first end of the sensor unit 320 may be connected to any one of the positive pole tab, the first connecting piece, and the positive pole column 121; the second pole of the battery cell may be the negative pole of the battery cell, and the second end of the on-off unit 310 may be connected to any one of the negative pole tab, the second connecting piece, and the negative pole column 131. In some other embodiments, the first pole of the battery cell may be the negative pole of the battery cell, and the second pole of the battery cell may be the positive pole of the battery cell.

[0053] According to the battery cell of this embodiment, before the high-voltage impact step is performed, the electrical connection between the second end of the sensing unit 320 and the second pole of the pole core 200 can be disconnected by the on-off unit 310. At this time, only the first end of the sensing unit 320 is connected to the first pole of the battery cell. Therefore, when the high-voltage impact step is performed, the voltage applied to the two poles of the pole core 200 will not be applied to the two ends of the sensing unit 320, and the sensing unit 320 will not be damaged by the high-voltage impact step. The safety of the battery cell can be effectively guaranteed by the high-voltage impact step, and the waste of production resources can be avoided. After the high-voltage impact step is performed, the electrical connection between the second end of the sensing unit 320 and the second pole of the pole core 200 can be turned on by the on-off unit 310. At this time, the sensing unit 320 can work normally.

[0054] It should be noted that the high-voltage shock process refers to a cell detection process in which a certain voltage is applied to the two poles of the battery cell and whether a short circuit occurs inside the battery cell is judged by the leakage current parameters.

[0055] See attached Figure 1 In this embodiment, the on-off unit 310 includes a switch body 311 and a control component.

[0056] The first end of the switch body 311 is electrically connected to the second end of the sensor unit 320, and the second end of the switch body 311 is electrically connected to the second pole of the pole core 200. When the switch body 311 is turned on, the second end of the sensor unit 320 is electrically connected to the second pole of the pole core 200 through the switch body 311, and when the switch body 311 is turned off, the second end of the sensor unit 320 is disconnected from the second pole of the pole core 200. Exemplarily, the switch body 311 can be a mechanical switch. In some embodiments, the switch body 311 can also be a high-voltage resistant switch tube.

[0057] The control component is connected to the switch body 311 and is used to control the on and off of the switch body 311 .

[0058] In this embodiment, the control component includes a wireless signal receiving module 312 and a controller 313. The switch body 311, the wireless signal receiving module 312 and the controller 313 are all located inside the housing.

[0059] The wireless signal receiving module 312 is used to receive a wireless control signal from outside the housing 100. Exemplarily, the wireless signal receiving module 312 includes at least one of a magnetic induction module, a Bluetooth module, an NFC module, and a WIFI module. Accordingly, the wireless control signal can be at least one of a magnetic field signal, a Bluetooth signal, an NFC signal, and a WIFI signal.

[0060] The controller 313 is connected to the switch body 311 and the wireless signal receiving module 312, and is used to control the on and off of the switch body 311 according to the wireless control signal. For example, the controller 313 can be a single chip microcomputer or other suitable control device.

[0061] According to the battery cell of this embodiment, the on and off of the switch body 311 can be controlled by only sending a wireless control signal outside the shell 100. There is no need to open a hole in the shell 100 to lead out the on-off unit 310 to control it by wire, which can effectively ensure the integrity of the shell 100 and the safety of the battery cell.

[0062] In some other embodiments, the switch body 311 and the control component can be arranged outside the housing 100, and the control component can include a single chip microcomputer or other suitable control device, and the control component can receive control instructions in a wired manner to control the on and off of the switch body 311. The first end of the switch body 311 is electrically connected to the second end of the sensor unit 320 through a wire passing through the housing 100, and the second end of the switch body 311 is electrically connected to the second pole of the pole core 200 outside the housing 100. Specifically, the second end of the switch body 311 can be electrically connected to the pole (for example, the negative pole 131) located outside the housing through a wire, and the pole is electrically connected to the second pole of the pole core 200 through a connecting piece, so that the second end of the switch body 311 is electrically connected to the second pole of the pole core through the wire, the pole and the connecting piece.

[0063] In some other embodiments, the switch body 311 may be disposed inside the housing 100, the first end of the switch body 311 is electrically connected to the second end of the sensor unit 320, and the second end of the switch body 311 is electrically connected to the second pole of the pole core 200. The control component may be disposed outside the housing 100, the control component may be electrically connected to the switch body through a wire passing through the housing 100, the control component may include a single chip microcomputer or other suitable control device, and the control component may receive control instructions in a wired manner to control the on and off of the switch body 311.

[0064] See attached Figure 1 In this embodiment, the sensing unit 320 includes a sensor and a digital-to-analog conversion module 322. The sensor is connected to the digital-to-analog conversion module 322, which is electrically connected to the first pole of the pole core 200 and to the second pole of the pole core 200 through the on-off unit 310. The digital-to-analog conversion module 322 is used to convert the digital signal output by the sensor into an analog signal (such as a voltage signal or a current signal), and superimpose the analog signal on the first and second poles of the pole core 200, and output it to the outside through the first and second poles of the pole core 200, that is, through the positive pole 121 and the negative pole 131. Therefore, the signal acquisition device outside the battery cell only needs to be connected to the positive pole 121 and the negative pole 131, and the analog signal can be collected to obtain the detection result of the sensor.

[0065] According to the battery cell of this embodiment, the detection result of the sensor is transmitted to the outside through the positive electrode post 121 and the negative electrode post 131. There is no need to open a hole in the shell 100 to lead out the sensor by wire to obtain its detection result, which can effectively ensure the integrity of the shell 100 and the safety of the battery cell.

[0066] Exemplarily, the sensor may include at least one of a voltage sensor 323 , a temperature sensor 324 , a pressure sensor, a stress sensor 326 , and a gas sensor 327 .

[0067] See attached Figure 1 In this embodiment, the sensor includes a voltage sensor 323, a temperature sensor 324, a pressure sensor, a stress sensor 326, and a gas sensor 327. Exemplarily, the voltage sensor 323 may be a capacitive voltage sensor or a resistive voltage sensor; the temperature sensor 324 may be an RTC, NTC type thermal resistor, a thermocouple probe, an optical fiber sensor, or a thin film temperature sensor; the pressure sensor may be a thin film pressure sensor; the stress sensor 326 may be a strain gauge or an optical fiber sensor; and the gas sensor 327 may be a MEMS gas sensor for detecting the concentration of gases such as CO2, H2, and CO in the housing 100.

[0068] See attached Figure 1 In this embodiment, the sensing unit 320 includes a power supply module 321, a first end of the power supply module 321 is electrically connected to the first pole of the pole core 200, and a second end of the power supply module 321 is electrically connected to the second pole of the pole core 200 through the on-off unit 310, and the power supply module 321 is used to draw power from the pole core 200 and supply power to the sensing unit 300. That is, when the switch body 311 in the on-off unit 310 is turned on, the two ends of the power supply module 321 are electrically connected to the two poles of the pole core 200, and the power supply module 321 can draw power from the pole core 200 to supply power to the devices in the sensing unit 320 that need power (such as the on-off unit 310 mentioned above). Exemplarily, the power supply module 321 may include a DC-DC conversion circuit and a low voltage difference linear regulator.

[0069] Exemplarily, the sensing unit 320 further includes a power supply module, which is connected to the on-off unit 310 and is used to supply power to the on-off unit 310 when the power supply module 321 is not working (i.e., before the high-voltage impact step) so that it can work normally. The power supply module is also connected to the power supply module 321, and the power supply module 321 can charge the power supply module after taking power from the pole core 200.

[0070] See attached Figure 2In this embodiment, the battery cell further includes a FPC (Flexible Printed Circuit) 400, which is located inside the shell. The sensing unit 320 and the on-off unit 310 are both arranged on the FPC 400, and the first end of the FPC 400 is electrically connected to the first pole of the pole core 200, and the second end of the FPC 400 is electrically connected to the second pole of the pole core 200. The sensing unit 320 and the on-off unit 310 are both electrically connected to the pole core 200 through the FPC. Since the FPC is thinner and has a freer shape than the hard PCB (Printed Circuit Board), the FPC 400 can be placed on the large surface, side or inside of the pole core 200 according to the detection requirements for the internal detection of the battery cell. The use of FPC 400 can optimize the space occupied by the circuit board, fit the internal structure of the battery cell, and can freely design the detection points, which can significantly improve the adaptability of the battery cell and reduce the impact on the performance of the battery cell.

[0071] In some other embodiments, the sensing unit 300 further includes a hard PCB, the FPC 400 is located inside the housing, the sensing unit 320 and the on-off unit 310 are both arranged on the hard PCB, the first end of the hard PCB is electrically connected to the first pole of the pole core 200 through a wire, and the second end of the hard PCB is electrically connected to the second pole of the pole core 200 through a wire. The sensing unit 320 and the on-off unit 310 are both electrically connected to the pole core 200 through the hard PCB and the wire. The wire can be a high-voltage resistant wire, the interior of which can be made of metal aluminum, metal copper or metal nickel, and the outer layer can be made of materials such as polytetrafluoroethylene, polyethylene terephthalate, aramid, epoxy resin, phenolic resin and silicone rubber to ensure insulation between the outside and the electrolyte.

[0072] In this embodiment, the battery cell further includes a semipermeable membrane and a plastic package, the semipermeable membrane covers the gas sensor 327, the plastic package covers the sensing unit 320, and at least partially exposes the semipermeable membrane. Thus, the small molecule gas in the housing 100 can enter the gas sensor 327 through the semipermeable membrane and be detected by it, and the macromolecular electrolyte in the housing 100 cannot pass through the semipermeable membrane. The plastic package not only plays a structural support role, but also separates the sensing unit 320 from the internal environment of the battery cell to protect the components in the sensing unit 320. The setting of the semipermeable membrane and the plastic package not only ensures the accuracy of the detection of the sensing unit 320, but also the anti-corrosion treatment of the sensing unit 320 can extend the life of the sensing unit 320 to meet the needs of long-term detection of the battery cell.

[0073] It should be noted that when the on / off unit 310 is located inside the shell, the plastic package can cover the on / off unit 310 to separate the on / off unit 310 from the internal environment of the battery cell, thereby protecting the components in the on / off unit 310 .

[0074] Exemplarily, the semipermeable membrane can be a membrane layer of a sandwich structure consisting of a PP membrane, a PE membrane and a PP membrane. In some embodiments, the semipermeable membrane can also be an e-PTFE (expanded polytetrafluoroethylene) membrane.

[0075] Exemplarily, the material of the plastic package may be epoxy resin, polyurethane, polyimide, polydopamine or phenolic resin.

[0076] See attached Figure 3 , 4 The battery cell according to the second embodiment of the present application is exemplarily described. The battery cell includes a housing 100 ′, a pole core 200 , a switching unit 310 ′ and a sensor unit 320 .

[0077] The housing 100' is used to accommodate the pole core 200 and the sensor unit 320. Figure 1 In this embodiment, the housing 100' comprises an aluminum shell 110, a first cover plate 120' and a second cover plate. The aluminum shell 110 is in a hollow cylindrical shape, which is closed on all sides and has openings at both ends. The first cover plate 120' and the second cover plate are respectively connected to the openings at both ends of the aluminum shell 110. An accommodation space for accommodating the pole core 200 and the sensor unit 320 is formed between the aluminum shell 110, the first cover plate 120' and the second cover plate. A first pole and a through hole 122 are provided on the first cover plate 120', and a second pole is provided on the second cover plate. The first pole can be a positive pole 121, and the second pole can be a negative pole 131.

[0078] The pole core 200 is located inside the housing 100', that is, in the accommodation space. The specific structure of the pole core 200 has been described in detail in the above embodiment, and will not be repeated here.

[0079] The sensing unit 320 is located inside the housing 100 and is used to detect parameters inside the housing 100. The sensing unit 300 includes the sensing unit 320 and the on-off unit 310, and the first end of the sensing unit 320 is electrically connected to the first pole of the pole core 200. The specific structure of the sensing unit 320 has been described in detail in the above embodiment and will not be repeated here.

[0080] The first end of the on-off unit 310' is electrically connected to the second end of the sensing unit 320, and the second end of the on-off unit 310' is electrically connected to the second pole of the pole core 200. The on-off unit 310' is used to disconnect the electrical connection between the second end of the sensing unit 320 and the second pole of the pole core 200 before the high-voltage impact step is performed on the battery cell, and to connect the electrical connection between the second end of the sensing unit 320 and the second pole of the pole core 200 after the high-voltage impact step is performed.

[0081] In this embodiment, the on-off unit 310' includes a first pin 314 and a second pin 315, the first pin 314 and the second pin 315 are inserted into the through hole 122, the first end of the first pin 314 is located inside the shell 100 and is electrically connected to the second end of the sensor unit 320, the first end of the second pin 315 is located inside the shell 100 and is electrically connected to the second pole of the pole core 200, and the second end of the first pin 314 and the second end of the second pin 315 are both located outside the shell 100 and welded.

[0082] According to the battery cell of this embodiment, before the high-voltage impact process is performed, the second end of the first pin 314 and the second end of the second pin 314 may not be welded, and the first pin 314 and the second pin 314 may be disconnected, that is, the electrical connection between the second end of the sensor unit 320 and the second pole of the pole core 200 is disconnected, and at this time, only the first end of the sensor unit 320 is connected to the first pole of the battery cell. Therefore, when the high-voltage impact process is performed, the voltage applied to the two poles of the pole core 200 will not be applied to the two ends of the sensor unit 320, and the sensor unit 320 will not be damaged by the high-voltage impact process. The high-voltage impact process can effectively ensure the safety of the battery cell and avoid the waste of production resources. After the high-voltage impact step, the second end of the first pin 314 and the second end of the second pin 314 can be connected by welding to conduct the electrical connection between the second end of the sensor unit 320 and the second pole of the pole core 200, that is, the second end of the sensor unit 320 is electrically connected to the second pole of the pole core 200 through the first pin 314 and the second pin 314. At this time, the sensor unit 320 can work normally.

[0083] See attached Figure 4 In this embodiment, the battery cell further includes a protective cover 600, the circumferential edge of which is connected to the housing 100' and covers the through hole 122, the second end of the first pin 314, and the second end of the second pin 314. The protective cover 600 may be in the shape of a hollow boss with a closed top, or in the shape of a hollow cylinder with a closed top. The circumferential edge of the bottom of the protective cover 600 is connected to the first cover plate 120' by means such as gluing or welding, and covers and protects the through hole 122, the first pin 314, and the second pin 314, so as to prevent objects outside the housing 100' from entering the housing 100' through the through hole 122, and also to prevent the second end of the first pin 314 and the second end of the second pin 314 from being lost or disconnected due to collision or the like.

[0084] See attached Figure 4In this embodiment, the sensing unit 320 further includes a hard PCB 500, which is located inside the housing 100. The sensing unit 320 and the on-off unit 310' (i.e., the first pin 314 and the second pin 314) are both arranged on the hard PCB 500. The first end of the hard PCB 500 is electrically connected to the first pole of the pole core 200 through a wire, and the second end of the hard PCB 500 is electrically connected to the second pole of the pole core 200 through a wire. The sensing unit 320 and the second pin 314 are both electrically connected to the pole core 200 through the hard PCB 500 and the wire. The wire can be a high-voltage resistant wire, and the interior can be made of metal aluminum, metal copper or metal nickel. The outer layer can be made of materials such as polytetrafluoroethylene, polyethylene terephthalate, aramid, epoxy resin, phenolic resin and silicone rubber to ensure insulation between the outside and the electrolyte.

[0085] In some other embodiments, the sensing unit 320 may include an FPC, and the sensing unit 320 and the on-off unit 310' (i.e., the first pin 314 and the second pin 314) are both arranged on the FPC, and the first end of the FPC is electrically connected to the first pole of the pole core 200, and the second end of the FPC is electrically connected to the second pole of the pole core 200. The sensing unit 320 and the second pin 314 are both electrically connected to the pole core 200 through the FPC. Since the FPC is thinner and has a freer shape than a hard PCB, the FPC circuit board can be placed on the large surface, side or inside of the pole core 200 according to the detection requirements for the internal detection of the battery cell. The use of FPC can optimize the space occupied by the circuit board, fit the internal structure of the battery cell, and can freely design the detection points, which can significantly improve the adaptability to the battery cell and reduce the impact on the performance of the battery cell.

[0086] In this embodiment, the battery cell further includes a semipermeable membrane and a plastic package, the semipermeable membrane covers the gas sensor 327, the plastic package covers the sensing unit 320, and at least partially exposes the semipermeable membrane. Thus, the small molecule gas in the housing 100 can enter the gas sensor 327 through the semipermeable membrane and be detected by it, and the macromolecular electrolyte in the housing 100 cannot pass through the semipermeable membrane. The plastic package not only plays a structural support role, but also separates the sensing unit 320 from the internal environment of the battery cell to protect the components in the sensing unit 320. The setting of the semipermeable membrane and the plastic package not only ensures the accuracy of the detection of the sensing unit 320, but also the anti-corrosion treatment of the sensing unit 320 can extend the life of the sensing unit 320 to meet the needs of long-term detection of the battery cell.

[0087] Exemplarily, the plastic package may cover the first end of the first pin 314 and the first end of the second pin 315 (ie, the first pin 314 and the second pin 315 located inside the shell) to separate them from the internal environment of the battery cell and protect them.

[0088] Exemplarily, the semipermeable membrane can be a membrane layer of a sandwich structure consisting of a PP membrane, a PE membrane and a PP membrane. In some embodiments, the semipermeable membrane can also be an e-PTFE (expanded polytetrafluoroethylene) membrane.

[0089] Exemplarily, the material of the plastic package may be epoxy resin, polyurethane, polyimide, polydopamine or phenolic resin.

[0090] The present application also provides a battery device, which includes the battery cell described above. The battery device may be a battery pack or a battery group. The battery device may also include a plurality of analysis chips, and the two ends of each analysis chip are respectively connected to the positive electrode column 121 and the negative electrode column 131 of each battery cell, so as to collect analog signals through the positive electrode column 121 and the negative electrode column 131 to obtain the detection results of the sensors in each battery cell.

[0091] The present application also provides an electrical device, which includes the battery device or the battery cell as described above. Exemplarily, the electrical device may be a vehicle or other electronic device that needs to be powered by a battery cell.

[0092] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0093] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0094] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various utility model aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features explicitly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with features that are less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0095] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0096] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0097] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims.

Claims

1. A battery cell, characterized in that: include: case; A pole core, located inside the shell; A sensor unit is located inside the housing, and a first end of the sensor unit is electrically connected to a first pole of the pole core; A switching unit, wherein a first end of the switching unit is electrically connected to a second end of the sensing unit, and a second end of the switching unit is electrically connected to a second pole of the pole core.

2. The battery cell according to claim 1, characterized in that: The on-off unit includes a switch body and a control component; The first end of the switch body is electrically connected to the second end of the sensor unit, and the second end of the switch body is electrically connected to the second pole of the pole core; The control component is connected to the switch body and is used to control the on and off of the switch body.

3. The battery cell according to claim 2, characterized in that: The switch body is located outside the housing, and the second end of the switch body is electrically connected to the second pole of the pole core outside the housing.

4. The battery cell according to claim 2, characterized in that: The control component includes a wireless signal receiving module and a controller; The switch body, the wireless signal receiving module and the controller are all located inside the housing; The wireless signal receiving module is used to receive a control signal from outside the housing; The controller is connected to the switch body and the wireless signal receiving module, and is used to control the on and off of the switch body according to the control signal.

5. The battery cell according to claim 4, characterized in that: The wireless signal receiving module includes at least one of a magnetic induction module, a Bluetooth module, an NFC module and a WIFI module.

6. The battery cell according to claim 1, characterized in that: The shell is provided with a through hole; The on-off unit includes a first pin and a second pin, the first pin and the second pin are inserted into the through hole, the first end of the first pin is located inside the shell and is electrically connected to the second end of the sensor unit, the first end of the second pin is located inside the shell and is electrically connected to the second pole of the pole core, and the second end of the first pin and the second end of the second pin are both located outside the shell and are welded.

7. The battery cell according to claim 6, characterized in that: The battery cell further includes a protective cover, a circumferential edge of which is connected to the housing and covers the through hole, the second end of the first pin, and the second end of the second pin.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The sensing unit includes a sensor and a digital-to-analog conversion module; The sensor is connected to the digital-to-analog conversion module; The digital-to-analog conversion module is electrically connected to the first pole of the pole core, and is electrically connected to the second pole of the pole core through the on-off unit. The digital-to-analog conversion module is used to convert the digital signal output by the sensor into an analog signal, and superimpose the analog signal on the first and second poles of the pole core.

9. The battery cell according to claim 8, characterized in that: The sensor includes at least one of a voltage sensor, a temperature sensor, a pressure sensor, a stress sensor and a gas sensor.

10. The battery cell according to claim 8, characterized in that: The sensor comprises a gas sensor; The battery cell further includes a semipermeable membrane and a plastic package. The semipermeable membrane covers the gas sensor, and the plastic package covers the sensing unit and at least partially exposes the semipermeable membrane.

11. The battery cell according to any one of claims 4 to 7, characterized in that: The battery cell also includes a hard PCB, which is located inside the shell. The sensor unit and the on-off unit are both arranged on the hard PCB. The first end of the hard PCB is electrically connected to the first pole of the pole core through a wire, and the second end of the hard PCB is electrically connected to the second pole of the pole core through a wire.

12. The battery cell according to any one of claims 4 to 7, characterized in that: The battery core also includes an FPC, which is located inside the shell. The sensor unit and the on-off unit are both arranged on the FPC. The first end of the FPC is electrically connected to the first pole of the pole core, and the second end of the FPC is electrically connected to the second pole of the pole core.

13. A battery device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 12.

14. An electrical device, characterized in that: The method comprises the battery device according to claim 13 or the battery cell according to any one of claims 1 to 12.

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