Single battery, battery pack and electric device

Abstract

The utility model provides a single battery, a battery pack comprising the single battery and an electric device comprising the battery pack or the single battery. The single battery comprises at least one pole core, a monitoring device, at least one monitoring probe, at least one insulating part and a shell, the monitoring probe is electrically connected with the monitoring device, the insulating part is arranged on one side of the pole core and provided with a concave space, the monitoring probe is contained in the concave space, and the shell is provided with a containing space. And the pole core, the monitoring device, the monitoring probe and the insulating part are positioned in the accommodating space. According to the utility model, the insulating part with the concave space is arranged in the single battery, and the monitoring probe is arranged in the concave space, so that the direct contact between the monitoring probe and the pole core of the battery is avoided, the pole core is protected, the safety of the battery is improved, and the service life of the battery is prolonged.

Description

Technical Field

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

[0002] Lithium batteries have the advantages of high voltage, high specific energy, many cycles, and long storage time. They are widely used not only in portable electronic devices (such as mobile phones, digital cameras, and laptops), but also in large and medium-sized electric devices such as electric vehicles, electric bicycles, and electric tools. Its wide applicability has attracted great attention to the safety of lithium-ion batteries during use. Therefore, it is very necessary to monitor the temperature, air pressure, or pressure of the battery during use.

[0003] The internal structure of lithium batteries is mainly composed of positive and negative electrodes and diaphragms. In related technologies, monitoring equipment is installed inside the battery to monitor the temperature, air pressure or pressure inside the battery in real time. This solution has a significant impact on the original structure of the battery, which will not only damage the core diaphragm and electrode, but also cause stress concentration and hinder the migration of lithium ions, affecting the electrochemical performance and life of the battery. Utility Model Content

[0004] In order to overcome the above technical problems, the utility model provides a single cell capable of accurately monitoring internal data of the battery, a battery pack including the single cell, and an electrical device including the battery pack or the single cell.

[0005] The first object of the utility model is to provide a single cell battery, comprising at least one pole core, a monitoring device, at least one monitoring probe, at least one insulating member and a shell having an accommodating space, wherein the monitoring probe is electrically connected to the monitoring device, the insulating member is arranged on one side of the pole core, the insulating member is provided with a recessed space, the monitoring probe is accommodated in the recessed space, and the pole core, the monitoring device, the monitoring probe and the insulating member are located in the accommodating space.

[0006] As a preferred solution of the utility model, the number of the pole cores is greater than or equal to 2, and the insulating member is arranged between any two adjacent pole cores.

[0007] As a preferred solution of the utility model, the single cell further comprises a spacer, the spacer is arranged at one end of the pole core and connected to the insulating member, and the monitoring device is arranged on the spacer.

[0008] As a preferred solution of the present invention, the insulating member is arranged at one end of the spacer in the thickness direction.

[0009] As a preferred solution of the present invention, the spacer ring and the insulating member are integrally formed.

[0010] As a preferred solution of the present utility model, the recessed space is arranged along the first direction of the insulating member.

[0011] As a preferred solution of the present invention, the monitoring probe does not protrude from the recessed space in the thickness direction of the insulating member.

[0012] As a preferred solution of the utility model, a groove is provided at one end of the spacer away from the pole core, and the monitoring device is arranged in the groove.

[0013] As a preferred solution of the present invention, the spacer further includes a fixing member, and the monitoring device is connected to the spacer via the fixing member.

[0014] As a preferred solution of the utility model, the groove is provided with a first through hole, the first through hole is communicated with the recessed space, and the monitoring probe is electrically connected to the monitoring device through the first through hole.

[0015] As a preferred solution of the present utility model, the monitoring device includes a functional module, the functional module includes at least one of a temperature sensor and a pressure sensor, and the functional module is electrically connected to the monitoring probe.

[0016] As a preferred solution of the present utility model, the monitoring device further comprises a wireless communication module, the wireless communication module is electrically connected to the functional module and the monitoring probe, and the wireless communication module is used to transmit the internal temperature or pressure of the single cell.

[0017] As a preferred solution of the utility model, a protective coating is provided on the outer side of the monitoring device.

[0018] A second object of the present utility model is to provide a battery pack, comprising a pack body and a single cell disposed in the pack body, wherein the single cell is the single cell provided by the present disclosure.

[0019] The third object of the present utility model is to provide an electrical device, wherein the electrical device is provided with the battery pack provided by the present disclosure or the single battery provided by the present disclosure.

[0020] The utility model arranges an insulating member with a recessed space inside a single battery, and places a monitoring probe in the recessed space, thereby avoiding direct contact between the monitoring probe and the battery pole core, protecting the pole core, and improving the safety and service life of the battery.

[0021] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0023] Figure 1 It is a schematic structural diagram of an insulating member provided according to the first embodiment of the present disclosure.

[0024] Figure 2 It is a schematic structural diagram of a spacer ring provided according to the first embodiment of the present disclosure.

[0025] Figure 3 yes Figure 2 A partial enlarged view of the groove part.

[0026] Figure 4 It is a schematic diagram of the structure of a battery disassembled according to the first embodiment of the present disclosure.

[0027] Figure 5 It is a schematic diagram of the structure of a battery disassembled according to the second embodiment of the present disclosure.

[0028] Figure 6 It is a schematic diagram of the structure of a battery disassembly provided according to the third embodiment of the present disclosure.

[0029] Figure 7 It is a structural schematic diagram of the appearance of a battery provided according to the first embodiment of the present disclosure.

[0030] Description of reference numerals:

[0031] 100-insulating member, 101-recessed space, 102-monitoring probe, 103-spacer, 104-monitoring device, 201-first pole core, 202-second pole core, 203-third pole core, 107-battery cover, 108-positive pole ear, 109-negative pole ear, 110-liquid injection hole, 113-groove, 123-fixing member, 133-first through hole, 200-battery housing, 1001-first insulating member, 1002-second insulating member,

[0032] X - first direction. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0034] In the present invention, unless otherwise specified, directional words such as "up, down, left, right" are usually defined based on the drawing direction of the corresponding drawings, and "inside and outside" refer to the inside and outside of the corresponding component outline.

[0035] like Figures 1 to 7 As shown, the utility model provides a technical solution of a single cell, a battery pack using the single cell, and an electrical device using the battery pack or the single cell. Among them, a plurality of single cells are placed in a battery pack in series or in parallel to form a battery pack. In addition, in addition to the field of battery packs, the various technical solutions provided in the utility model can also be widely used in other battery fields.

[0036] In order to clarify the technical solution of the utility model, the utility model is described through the following specific embodiments, but is not limited to these specific embodiments, and the features in each embodiment can be combined or replaced arbitrarily.

[0037] First, if Figures 1 to 7 As shown, the single cell provided by the utility model includes at least one pole core 201, at least one monitoring device 104, at least one monitoring probe 102, at least one insulating member 100, a spacer 103 and a battery case 200. When assembling the battery, the positive pole tab 108 and the negative pole tab 109 are passed through the spacer 103, and finally, the at least one pole core 201, the spacer 103 and the insulating member 100 are packaged together in the battery case 200.

[0038] The spacer 103 is provided with a groove 113, and the monitoring device 104 is integrated in the groove 113 on the spacer 103. The monitoring device 104 is fixed in the groove 113 of the spacer 103 by a fixing member 123. The surface of the monitoring device 104 is flush with the surface of the spacer 103. The monitoring device 104 is used to monitor the internal data of the single cell.

[0039] The insulating part 100 is arranged on one side of the pole core 201, and the insulating part 100 is connected to the spacer 103. The insulating part 100 is arranged at one end of the spacer 103 in the thickness direction. The insulating part 100 is provided with a recessed space 101, and the recessed space 101 is arranged along a first direction of the insulating part 100, and the first direction is a direction parallel to the pole core 201. The recessed space 101 is used to place the monitoring probe 102. The position and number of the recessed spaces 101 can be changed and increased or decreased according to actual needs. The monitoring probe 102 does not protrude from the recessed space 101 in the thickness direction of the insulating part 100, so that the monitoring probe 102 is completely accommodated in the recessed space 101, which can reduce the wear of the diaphragm and pole piece of at least one pole core 201 caused by uneven force on the monitoring probe 102.

[0040] like Figure 1As shown, in the first embodiment of the present disclosure, the insulating member 100 is provided with a recessed space 101, and the recessed space 101 is arranged along a first direction of the insulating member 100, and the first direction is a direction parallel to the pole core 201. The recessed space 101 is used to place the monitoring probe 102. The position and number of the recessed space 101 can be changed and increased or decreased according to actual needs. The monitoring probe 102 protrudes from the recessed space 101 in the thickness direction of the insulating member 100, so that the monitoring probe 102 is completely accommodated in the recessed space 101, which can reduce the wear of the diaphragm and the pole piece of the first pole core 201 and the second pole core 202 caused by uneven force on the monitoring probe 102.

[0041] like Figure 2 As shown, in the first embodiment of the present disclosure, the insulating member 100 is provided with a recessed space 101, which is arranged along the first direction of the insulating member 100, and the first direction is a direction parallel to the pole core 201. The recessed space 101 is used to place the monitoring probe 102. The position and number of the recessed space 101 can be changed and increased or decreased according to actual needs. The monitoring probe 102 does not protrude from the recessed space 101 in the thickness direction of the insulating member 100, so that the monitoring probe 102 is completely accommodated in the recessed space 101, which can reduce the wear of the diaphragm and pole piece of at least one pole core 201 caused by the uneven force of the monitoring probe 102. The insulating member 100 is connected to the spacer 103, and the insulating member 100 is arranged at one end of the spacer 103 in the thickness direction. There is a groove 113 on the end of the spacer 103 away from the pole core 201. The monitoring device 104 is integrated in the groove 113 on the spacer 103. The monitoring device 104 is fixed in the groove 113 of the spacer 103 by a fixing member 123. The surface of the monitoring device 104 is flush with the surface of the spacer 103. The working voltage of the monitoring device 104 is consistent with the working voltage of the battery. The monitoring device 104 is self-powered by the battery and does not require external power supply. The monitoring device 104 includes a functional module and a wireless communication module, wherein the sensor included in the functional module can be a pressure sensor in addition to a temperature sensor. The functional module can include only one sensor or multiple sensors. The electrolyte in the internal environment of the battery is corrosive, and acid-resistant and corrosion-resistant sensors are used to ensure the stable operation of the monitoring device 104, and a layer of insulating and corrosion-resistant coating, such as polytetrafluoroethylene, Teflon, etc., is coated on the surface of the monitoring device 104. The functional module is electrically connected to the monitoring probe 102 and the wireless communication module. The wireless communication module receives the data collected by the monitoring probe 102. The monitoring probe 102 transmits the data inside the battery to the wireless communication module. The wireless communication module sends the received signal to the outside of the battery for processing and analysis to understand the changes in the internal parameters of the battery in real time. In addition, the wireless communication module is a wireless transmission unit such as WIFI or Bluetooth.

[0042] like Figure 3 As shown, in the first embodiment of the present disclosure, a first through hole 133 is provided in the groove 113, and the first through hole 133 is connected to the recessed space 101, so that the monitoring probe 102 can extend into the recessed space 101 through the first through hole 133. The monitoring device 104 is arranged on the spacer 103, and the monitoring device 104 is fixed in the spacer groove 113 by the fixing member 123, and the surface of the monitoring device 104 is flush with the surface of the spacer 103. The monitoring device 104 includes a functional module and a wireless communication module, wherein the sensor included in the functional module can be a pressure sensor in addition to a temperature sensor, and the functional module can include only one sensor or multiple sensors. The electrolyte in the internal environment of the battery is corrosive, and acid-resistant and corrosion-resistant sensors are used to ensure the stable operation of the monitoring device 104, and a layer of insulating and corrosion-resistant coating, such as polytetrafluoroethylene, Teflon, etc., is coated on the surface of the monitoring device 104. The functional module is electrically connected to the monitoring probe 102 and the wireless communication module. The wireless communication module receives the data collected by the monitoring probe 102. The monitoring probe 102 transmits the data inside the battery to the wireless communication module. The wireless communication module sends the received signal to the outside of the battery for processing and analysis to understand the changes in the internal parameters of the battery in real time. In addition, the wireless communication module is a wireless transmission unit such as WIFI or Bluetooth.

[0043] like Figure 4As shown, in the first embodiment of the present disclosure, when assembling the battery, the first pole core 201 and the second pole core 202 are placed on both sides of the insulating member 100, the positive pole tab 108 and the negative pole tab 109 pass through the spacer 103, and finally the first pole core 201, the second pole core 202, the spacer 103 and the insulating member 100 are packaged in the battery housing 200. The spacer 103 is connected to the insulating member 100, and the insulating member 100 is connected to the middle position of the lower surface of the spacer 103, and the insulating member 100 is arranged at one end of the spacer 103 in the thickness direction. The insulating member 100 is provided with a recessed space 101, which is arranged along a first direction of the insulating member 100, and the first direction is a direction parallel to the pole core 201. The recessed space 101 is used to place the monitoring probe 102. The position and number of the recessed space 101 can be changed and increased or decreased according to actual needs. The monitoring probe 102 does not protrude from the recessed space 101 in the thickness direction of the insulating member 100, so that the monitoring probe 102 can be completely accommodated in the recessed space 101, which can reduce the wear of the diaphragm and the pole piece of the first pole core 201 and the second pole core 202 caused by uneven force on the monitoring probe 102. The spacer 103 and the insulating member 100 are an integral structure. There is a groove 113 on the end of the spacer 103 away from the pole core 201. The monitoring device 104 is integrated in the groove 113 on the spacer 103. The monitoring device 104 is fixed in the groove 113 of the spacer 103 by a fixing member 123. The surface of the monitoring device 104 is flush with the surface of the spacer 103. The working voltage of the monitoring device 104 is consistent with the working voltage of the battery. The monitoring device 104 is self-powered by the battery and does not require external power supply. There is a first through hole 133 in the groove 113. The through hole 133 is connected to the recessed space 101 to facilitate the monitoring probe 102 to pass through. The monitoring probe 102 extends into the recessed space 101 through the first through hole 133. The monitoring device 104 includes a functional module and a wireless communication module, wherein the sensor included in the functional module can be a temperature sensor or a pressure sensor. The functional module can include only one sensor or multiple sensors. The electrolyte in the internal environment of the battery is corrosive, so acid-resistant and corrosion-resistant sensors are used to ensure the stable operation of the monitoring device 104, and a layer of insulating and corrosion-resistant coating, such as polytetrafluoroethylene, Teflon, etc., is coated on the surface of the monitoring device 104. The functional module is electrically connected to the monitoring probe 102 and the wireless communication module. The wireless communication module receives the data collected by the monitoring probe 102, and the monitoring probe 102 transmits the data inside the battery to the wireless communication module. The wireless communication module sends the received signal to the outside of the battery for processing and analysis to understand the changes in the internal parameters of the battery in real time. In addition, the wireless communication module is a wireless transmission unit such as WIFI or Bluetooth.

[0044] like Figure 5As shown, in the second embodiment of the present disclosure, when assembling the battery, the first pole core 201 is placed on one side of the insulating member 100, the positive pole tab 108 and the negative pole tab 109 pass through the spacer 103, and finally the first pole core 201, the spacer 103 and the insulating member 100 are packaged together in the battery housing 200. The spacer 103 is connected to the insulating member 100, and the insulating member 100 is connected to the side of the spacer 103 away from the first pole core 201, and the insulating member 100 is arranged at one end of the spacer 103 in the thickness direction. The insulating member 100 is provided with a recessed space 101, which is arranged along a first direction of the insulating member 100, and the first direction is a direction parallel to the pole core 201. The recessed space 101 is used to place a monitoring probe 102. The position and number of the recessed spaces 101 can be changed and increased or decreased according to actual needs. The monitoring probe 102 does not protrude from the recessed space 101 in the thickness direction of the insulating member 100, so that the monitoring probe 102 can be completely accommodated in the recessed space 101, which can reduce the wear of the diaphragm and the pole piece of the first pole core 201 caused by uneven force on the monitoring probe 102. The spacer 103 and the insulating member 100 are an integral structure. There is a groove 113 on the end of the spacer 103 away from the pole core 201. The monitoring device 104 is integrated in the groove 113 on the spacer 103. The monitoring device 104 is fixed in the groove 113 of the spacer 103 by a fixing member 123. The surface of the monitoring device 104 is flush with the surface of the spacer 103. The working voltage of the monitoring device 104 is consistent with the working voltage of the battery. The monitoring device 104 is self-powered by the battery and does not require external power supply. There is a first through hole 133 in the groove 113. The through hole 133 is connected to the recessed space 101 to facilitate the monitoring probe 102 to pass through. The monitoring probe 102 extends into the recessed space 101 through the first through hole 133. The monitoring device 104 includes a functional module and a wireless communication module, wherein the sensor included in the functional module can be a temperature sensor or a pressure sensor. The functional module can include only one sensor or multiple sensors. The electrolyte in the internal environment of the battery is corrosive, so acid-resistant and corrosion-resistant sensors are used to ensure the stable operation of the monitoring device 104, and a layer of insulating and corrosion-resistant coating, such as polytetrafluoroethylene, Teflon, etc., is coated on the surface of the monitoring device 104. The functional module is electrically connected to the monitoring probe 102 and the wireless communication module. The wireless communication module receives the data collected by the monitoring probe 102, and the monitoring probe 102 transmits the data inside the battery to the wireless communication module. The wireless communication module sends the received signal to the outside of the battery for processing and analysis to understand the changes in the internal parameters of the battery in real time. In addition, the wireless communication module is a wireless transmission unit such as WIFI or Bluetooth.

[0045] like Figure 6As shown, in the third embodiment of the present disclosure, the first pole core 201 and the second pole core 202 are placed on both sides of the first insulating member 1001, the second pole core 202 and the third pole core 203 are placed on both sides of the second insulating member 1002, the positive pole tab 108 and the negative pole tab 109 pass through the spacer 103, and finally the first pole core 201, the second pole core 202, the third pole core 203, the spacer 103 and the first insulating member 1001 and the second insulating member 1002 are packaged in the battery housing 200. The spacer 103 is connected to the first insulating member 1001 and the second insulating member 1002 respectively, and the first insulating member 1001 and the second insulating member 1002 are arranged at one end of the spacer 103 in the thickness direction. The first insulating member 100 is provided with a first recessed space, which is arranged along a first direction of the first insulating member 1001, the first direction being a direction parallel to the first pole core 201, and the first recessed space is used to place a first monitoring probe. The second insulating member 1002 is provided with a second recessed space, which is arranged along the first direction of the second insulating member 1002, the first direction being a direction parallel to the second pole core 202, and the second recessed space is used to place a second monitoring probe. The first monitoring probe does not protrude from the first recessed space in the thickness direction of the first insulating member 1001, and the second monitoring probe does not protrude from the second recessed space in the thickness direction of the second insulating member 1002, so that the first monitoring probe is completely accommodated in the first recessed space, and the second monitoring probe is completely accommodated in the second recessed space, which can reduce the wear of the diaphragm and pole piece of the first pole core 201, the second pole core 202 and the third pole core 203 caused by uneven force on the first monitoring probe and the second monitoring probe. The spacer 103 is an integral structure with the first insulating member 1001 and the second insulating member 1002. A groove 113 is provided at one end of the spacer 103 away from the first pole core 201 and the second pole core 202. The monitoring device 104 is integrated into the groove 113 on the spacer 103. The monitoring device 104 is fixed in the groove 113 of the spacer 103 by a fixing member 123. The monitoring device 104 is flush with the surface of the spacer 103. The working voltage of the monitoring device 104 is consistent with the working voltage of the battery. The monitoring device 104 is self-powered by the battery and does not require external power supply. A first through hole 133 and a second through hole are provided in the groove 113. The first through hole 133 is connected to the first recessed space, and the second through hole is connected to the second recessed space, so as to facilitate the first monitoring probe and the second monitoring probe to pass through. The first monitoring probe extends into the first recessed space through the first through hole 133, and the second monitoring probe extends into the second recessed space through the second through hole. The monitoring device 104 includes a functional module and a wireless communication module, wherein the sensor included in the functional module may be a temperature sensor as well as a pressure sensor, and the functional module may include only one sensor or multiple sensors.The electrolyte in the internal environment of the battery is corrosive, and acid-resistant and corrosion-resistant sensors are used to ensure the stable operation of the monitoring device 104, and a layer of insulating and corrosion-resistant coating, such as polytetrafluoroethylene, Teflon, etc., is coated on the surface of the monitoring device 104. The functional module is electrically connected to the first monitoring probe, the second monitoring probe and the wireless communication module. The wireless communication module receives the data collected by the first monitoring probe and the second monitoring probe. The first monitoring probe and the second monitoring probe transmit the data inside the battery to the wireless communication module. The wireless communication module sends the received signal to the outside of the battery for processing and analysis to understand the changes in the internal parameters of the battery in real time. In addition, the wireless communication module is a wireless transmission unit such as WIFI or Bluetooth.

[0046] like Figure 5 As shown, the single cell also includes a battery shell 200 and a battery cover 107, which together form a containing space, in which at least one pole core 201, a spacer 103, at least one insulating member 100, a monitoring device 104 and a monitoring probe 102 are located, the spacer 103 is connected to the battery cover 107, and a liquid injection hole 110 is also provided on the battery cover 107.

[0047] In addition, each embodiment of the present disclosure further provides a battery pack using the single cell, and an electric device using the battery pack or the single cell.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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 single cell battery, characterized in that: include: at least one pole core; Monitoring devices; at least one monitoring probe, the monitoring probe being electrically connected to the monitoring device; at least one insulating member, the insulating member being disposed on one side of the pole core, the insulating member being provided with a recessed space, and the monitoring probe being accommodated in the recessed space; The shell has an accommodating space, and the pole core, the monitoring device, the monitoring probe and the insulating member are located in the accommodating space.

2. The single cell according to claim 1, characterized in that: The number of the pole cores is greater than or equal to 2, and the insulating member is disposed between any two adjacent pole cores.

3. The single cell according to claim 1 or 2, characterized in that: The single cell further comprises a spacer, which is arranged at one end of the pole core and connected to the insulating member, and the monitoring device is arranged on the spacer.

4. The single cell according to claim 3, characterized in that: The insulating member is arranged at one end of the spacer in the thickness direction.

5. The single cell according to claim 3, characterized in that: The spacer ring is integrally formed with the insulating member.

6. The single cell according to claim 1 or 2, characterized in that: The recessed space is arranged along a first direction of the insulating member.

7. The single cell according to claim 1 or 2, characterized in that: The monitoring probe does not protrude from the recessed space in the thickness direction of the insulating member.

8. The single cell according to claim 3, characterized in that: A groove is provided at one end of the spacer away from the pole core, and the monitoring device is arranged in the groove.

9. The single cell according to claim 3, characterized in that: The spacer also includes a fixing member, and the monitoring device is connected to the spacer via the fixing member.

10. The single cell according to claim 8, characterized in that: The groove is provided with a first through hole, the first through hole is communicated with the recessed space, and the monitoring probe is electrically connected to the monitoring device through the first through hole.

11. The single cell according to claim 1 or 2, characterized in that: The monitoring device includes a functional module, the functional module includes at least one of a temperature sensor and a pressure sensor, and the functional module is electrically connected to the monitoring probe.

12. The single cell according to claim 11, characterized in that: The monitoring device further comprises a wireless communication module, the wireless communication module is electrically connected to the functional module and the monitoring probe, and the wireless communication module is used to transmit the internal temperature or pressure of the single battery.

13. The single cell according to claim 1 or 2, characterized in that: A protective coating is provided on the outer side of the monitoring device.

14. A battery pack, comprising a pack body and a single battery disposed in the pack body, characterized in that: The single cell is a single cell according to any one of claims 1 to 13.

15. An electrical device, characterized in that: The electrical device is provided with the battery pack according to claim 14 or the single battery according to any one of claims 1-13.

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