Battery cell, battery pack, and electric device

Abstract

The present application provides a battery cell, a battery pack comprising the battery cell, and an electric device comprising the battery pack or the battery cell. The battery cell comprises at least one core, a monitoring device, at least one monitoring probe, at least one insulating member, and a casing; the monitoring probe is electrically connected to the monitoring device; the insulating member is arranged on one side of the core; the insulating member is provided with a recessed space; the monitoring probe is accommodated in the recessed space; the casing is provided with an accommodating space; and the core, the monitoring device, the monitoring probe, and the insulating member are located in the accommodating space. According to the present application, an insulating member provided with a recessed space is arranged in the battery cell, and a monitoring probe is arranged in the recessed space, so that the direct contact between the monitoring probe and a battery cell core is avoided, and thus the core is protected, thereby improving the safety of the battery and prolonging the service life of the battery.

Description

Single cells, battery packs and electrical devices

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 29, 2024, with application number 202420225668.5 and application name “Single Cell, Battery Pack and Electrical Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] 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

[0003] Lithium batteries offer advantages such as high voltage, high specific energy, a high number of cycles, and long storage times. 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 power tools. Their wide applicability has led to significant concerns about the safety of lithium-ion batteries during use. Therefore, it is essential to monitor battery temperature, air pressure, and other information during use.

[0004] The internal structure of a lithium-ion battery primarily consists of positive and negative electrodes and a separator. Related technologies incorporate internal monitoring equipment to provide real-time monitoring of internal temperature, air pressure, and other information. This approach significantly alters the battery's existing structure, damaging the core separator and electrodes. It also creates stress concentration and hinders lithium-ion migration, impacting the battery's electrochemical performance and lifespan.

[0005] Summary of the Invention

[0006] In order to overcome the above technical problems, the present application provides a single cell battery capable of accurately monitoring internal battery data, a battery pack including the single cell battery, and an electrical device including the battery pack or the single cell battery.

[0007] The first object of the present application 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 a 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.

[0008] As a preferred solution of the present application, 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.

[0009] As a preferred solution of the present application, the single battery further includes 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.

[0010] As a preferred solution of the present application, the insulating member is arranged at one end of the spacer in the thickness direction.

[0011] As a preferred solution of the present application, the spacer and the insulating member are integrally formed.

[0012] As a preferred solution of the present application, the recessed space is arranged along the first direction of the insulating member.

[0013] As a preferred solution of the present application, the monitoring probe does not protrude from the recessed space in the thickness direction of the insulating member.

[0014] As a preferred solution of the present application, a groove is provided at one end of the spacer away from the pole core, and the monitoring device is arranged in the groove.

[0015] As a preferred solution of the present application, the spacer further includes a fixing member, and the monitoring device is connected to the spacer via the fixing member.

[0016] As a preferred solution of the present application, 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.

[0017] As a preferred solution of the present application, 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.

[0018] As a preferred solution of the present application, the monitoring device further includes a wireless communication module, which is electrically connected to the functional module and the monitoring probe, and is used to transmit the internal temperature or pressure of the single cell.

[0019] As a preferred solution of the present application, a protective coating is provided on the outer side of the monitoring device.

[0020] A second object of the present application 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.

[0021] The third object of the present application 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.

[0022] The present application arranges an insulating member with a recessed space inside a single cell, 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.

[0023] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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 detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0025] FIG1 is a schematic structural diagram of an insulating member provided according to a first embodiment of the present disclosure.

[0026] FIG2 is a schematic structural diagram of a spacer provided according to the first embodiment of the present disclosure.

[0027] FIG3 is a partial enlarged view of the groove portion of FIG2.

[0028] FIG4 is a schematic structural diagram of a disassembled battery according to the first embodiment of the present disclosure.

[0029] FIG5 is a schematic structural diagram of a disassembled battery according to a second embodiment of the present disclosure.

[0030] FIG6 is a schematic structural diagram of a disassembled battery according to a third embodiment of the present disclosure.

[0031] FIG7 is a schematic structural diagram of the appearance of a battery provided according to the first embodiment of the present disclosure.

[0032] Description of reference numerals:

[0033] 100-insulating part, 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 tab, 109-negative pole tab, 110-liquid injection hole, 113-groove, 123-fixing part, 133-first through hole, 200-battery casing, 1001-first insulating part, 1002-second insulating part, X-first direction. DETAILED DESCRIPTION

[0034] The following describes the specific embodiments of the present application in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not intended to limit the present application.

[0035] In this application, unless otherwise specified, directional words such as "up, down, left, right" are generally 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.

[0036] As shown in Figures 1 to 7, this application provides technical solutions for single cells, battery packs using the same, and electrical devices using the same or the same. A battery pack is formed by placing multiple single cells in series or in parallel. In addition to the battery pack field, the various technical solutions provided in this application can also be widely applied to other battery fields.

[0037] In order to clarify the technical solution of the present application, the present application is described through the following specific embodiments, but is not limited to these specific embodiments, and the features in each embodiment can be further combined or replaced at will.

[0038] First, as shown in Figures 1 to 7, the single battery provided in the present application 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 shell 200. When assembling the battery, the positive electrode tab 108 and the negative electrode 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 placed together in the battery shell 200 for packaging.

[0039] The spacer 103 is provided with a groove 113, and 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 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.

[0040] 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. The recessed space 101 is arranged along the 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 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 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.

[0041] As shown in Figure 1, in the first embodiment of the present disclosure, 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 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 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 the first pole core 201 and the second pole core 202 caused by uneven force on the monitoring probe 102.

[0042] As shown in FIG2 , in a first embodiment of the present disclosure, the insulating member 100 is provided with a recessed space 101. The recessed space 101 is arranged along a first direction of the insulating member 100, which 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 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 on 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 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 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. The sensor included in the functional module can be a temperature sensor as well as 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. 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 data collected by the monitoring probe 102, and the monitoring probe 102 transmits the internal battery data to the wireless communication module. The wireless communication module then transmits the received signal to the outside of the battery for processing and analysis to obtain real-time information on changes in internal battery parameters. Furthermore, the wireless communication module is a wireless transmission unit such as Wi-Fi or Bluetooth.

[0043] As shown in FIG3 , in the first embodiment of the present disclosure, a first through hole 133 is provided in the groove 113. 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 provided on the spacer 103, and the monitoring device 104 is fixed in the spacer groove 113 by the fixing member 123. 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 temperature sensor as well as 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, 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 data collected by the monitoring probe 102, and the monitoring probe 102 transmits the internal battery data to the wireless communication module. The wireless communication module then transmits the received signal to the outside of the battery for processing and analysis to obtain real-time information on changes in internal battery parameters. Furthermore, the wireless communication module is a wireless transmission unit such as Wi-Fi or Bluetooth.

[0044] As shown in FIG4 , in the first embodiment of the present disclosure, when assembling the battery, the first electrode core 201 and the second electrode core 202 are placed on both sides of the insulating member 100, the positive electrode tab 108 and the negative electrode tab 109 are passed through the spacer 103, and finally the first electrode core 201, the second electrode core 202, the spacer 103 and the insulating member 100 are placed together into the battery case 200 for packaging. 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. The insulating member 100 is set at one end of the spacer 103 in the thickness direction. The insulating part 100 is provided with a recessed space 101, which 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 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 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 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 integrally structured. A groove 113 is formed on the end of the spacer 103 away from the pole core 201. The monitoring device 104 is integrated into the groove 113 on the spacer 103. The monitoring device 104 is fixed to 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 operating voltage of the monitoring device 104 is consistent with the operating voltage of the battery. The monitoring device 104 is self-powered by the battery and does not require external power. A first through hole 133 is formed in the groove 113. The through hole 133 is connected to the recessed space 101 to facilitate the passage of the monitoring probe 102. The monitoring probe 102 extends into the interior of the recessed space 101 through the first through hole 133. The monitoring device 104 includes a functional module and a wireless communication module. 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 battery's internal environment is corrosive, so acid-resistant and corrosion-resistant sensors are used to ensure stable operation of monitoring device 104. The surface of monitoring device 104 is coated with an insulating and corrosion-resistant coating, such as polytetrafluoroethylene or Teflon. The functional module is electrically connected to monitoring probe 102 and the wireless communication module. The wireless communication module receives data collected by monitoring probe 102, which then transmits the internal battery data to the wireless communication module. The wireless communication module then transmits the received signal to the outside of the battery for processing and analysis, providing real-time information on changes in internal battery parameters. The wireless communication module also utilizes a wireless transmission unit, such as Wi-Fi or Bluetooth.

[0045] As shown in FIG5 , in the second embodiment of the present disclosure, when assembling the battery, the first electrode core 201 is placed on one side of the insulating member 100, the positive electrode tab 108 and the negative electrode tab 109 are passed through the spacer 103, and finally the first electrode core 201, the spacer 103, and the insulating member 100 are placed together in the battery casing 200 for packaging. 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 electrode core 201. The insulating member 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, which 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 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 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 the first pole core 201 caused by uneven force on the monitoring probe 102. The spacer 103 and the insulating member 100 are integrally structured. A groove 113 is formed on the end of the spacer 103 away from the pole core 201. The monitoring device 104 is integrated into the groove 113 on the spacer 103. The monitoring device 104 is fixed to 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 operating voltage of the monitoring device 104 is consistent with the operating voltage of the battery. The monitoring device 104 is self-powered by the battery and does not require external power. A first through hole 133 is formed in the groove 113. The through hole 133 is connected to the recessed space 101 to facilitate the passage of the monitoring probe 102. The monitoring probe 102 extends into the interior of the recessed space 101 through the first through hole 133. The monitoring device 104 includes a functional module and a wireless communication module. 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 battery's internal environment is corrosive, so acid-resistant and corrosion-resistant sensors are used to ensure stable operation of monitoring device 104. The surface of monitoring device 104 is coated with an insulating and corrosion-resistant coating, such as polytetrafluoroethylene or Teflon. The functional module is electrically connected to monitoring probe 102 and the wireless communication module. The wireless communication module receives data collected by monitoring probe 102, which then transmits the internal battery data to the wireless communication module. The wireless communication module then transmits the received signal to the outside of the battery for processing and analysis, providing real-time information on changes in internal battery parameters. The wireless communication module also utilizes a wireless transmission unit, such as Wi-Fi or Bluetooth.

[0046] As shown in FIG6 , in the third embodiment of the present disclosure, the first electrode core 201 and the second electrode core 202 are placed on both sides of the first insulating member 1001, and the second electrode core 202 and the third electrode core 203 are placed on both sides of the second insulating member 1002. The positive electrode tab 108 and the negative electrode tab 109 are passed through the spacer 103. Finally, the first electrode core 201, the second electrode core 202, and the third electrode core 203 are encapsulated together with the spacer 103 and the first and second insulating members 1001, 1002 into the battery case 200. The spacer 103 is connected to the first and second insulating members 1001, 1002, respectively. The first and second insulating members 1001, 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 the 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 on the diaphragms and pole pieces of the first pole core 201, the second pole core 202 and the third limit 203 caused by uneven force between the first monitoring probe and the second monitoring probe. The spacer 103 is integrally formed with the first insulating member 1001 and the second insulating member 1002. A groove 113 is provided on the 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 of the spacer 103 and fixed within the groove 113 of the spacer 103 using a fixing member 123. The monitoring device 104 is flush with the surface of the spacer 103. The operating voltage of the monitoring device 104 is consistent with the operating voltage of the battery. The monitoring device 104 is self-powered by the battery and does not require external power. A first through hole 133 and a second through hole are provided within the groove 113. The first through hole 133 communicates with the first recessed space, and the second through hole communicates with the second recessed space, facilitating the passage of the first and second monitoring probes. 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. The sensor included in the functional module may be a temperature sensor or a pressure sensor. The functional module may include only one sensor or multiple sensors.The electrolyte in the battery's internal environment is corrosive, so acid-resistant and corrosion-resistant sensors are used to ensure the stable operation of monitoring device 104. A layer of insulating and corrosion-resistant coating, such as polytetrafluoroethylene or Teflon, is applied to the surface of 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 data collected by the first and second monitoring probes, and the first and second monitoring probes transmit the internal battery data to the wireless communication module. The wireless communication module transmits the received signals to the outside of the battery for processing and analysis to obtain real-time information on changes in internal battery parameters. In addition, the wireless communication module is a wireless transmission unit such as WiFi or Bluetooth.

[0047] As shown in Figure 5, the single battery also includes a battery shell 200 and a battery cover 107. The battery shell 200 and the battery cover 107 together form an accommodating space. 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 in the accommodating space. The spacer 103 is connected to the battery cover 107, and the battery cover 107 is also provided with a liquid injection hole 110.

[0048] In addition, various embodiments of the present disclosure further provide a battery pack using the single cell, and an electrical device using the battery pack or the single cell.

[0049] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely illustrative and are not intended to limit the scope of the present application. Various changes and modifications may be made therein by those skilled in the art without departing from the scope and spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0050] 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.

[0051] Similarly, it should be understood that in order to streamline the present application and aid in understanding one or more of the various application 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, this approach to the present application should not be interpreted as reflecting the intention that the application claimed for protection requires more features than those explicitly recited in each claim. More precisely, 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 detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present application.

[0052] Those skilled in the art will understand that, except where mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or apparatus disclosed herein may be combined in any combination. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that provides the same, equivalent, or similar purpose.

[0053] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of this application and to form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

[0054] 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 battery comprising: at least one pole core; Monitoring device (104); at least one monitoring probe (102), the monitoring probe (102) being electrically connected to the monitoring device (104); at least one insulating member (100), the insulating member (100) being arranged on one side of the pole core, the insulating member (100) being provided with a recessed space (101), and the monitoring probe (102) being accommodated in the recessed space (101); The housing has an accommodating space, and the pole core, the monitoring device (104), the monitoring probe (102) and the insulating member (100) are located in the accommodating space.

2. The single cell according to claim 1, wherein the number of the pole cores is greater than or equal to 2, and the insulating member (100) is arranged between any two adjacent pole cores.

3. The single cell according to claim 1 or 2, further comprising a spacer (103), wherein the spacer (103) is arranged at one end of the pole core and connected to the insulating member (100), and the monitoring device (104) is arranged on the spacer (103).

4. The single cell according to claim 3, wherein the insulating member (100) is arranged at one end of the spacer (103) in a thickness direction.

5. The single cell according to claim 3, wherein the spacer (103) and the insulating member (100) are integrally formed.

6. The single cell according to claim 1 or 2, wherein the recessed space (101) is arranged along the first direction (X) of the insulating member (100).

7. The single battery according to claim 1 or 2, wherein the monitoring probe (102) does not protrude from the recessed space (101) in a thickness direction of the insulating member (100).

8. The single battery according to claim 3, wherein a groove (113) is provided at one end of the spacer (103) away from the pole core, and the monitoring device (104) is provided in the groove (113).

9. The single cell according to claim 3, wherein the spacer (103) further comprises a fixing member (123), and the monitoring device (104) is connected to the spacer (103) via the fixing member (123).

10. The single battery according to claim 8, wherein the groove (113) is provided with a first through hole (133), the first through hole (133) is communicated with the recessed space (101), and the monitoring probe (102) is electrically connected to the monitoring device (104) through the first through hole (133).

11. The single cell according to claim 1 or 2, wherein the monitoring device (104) comprises a functional module, the functional module comprises at least one of a temperature sensor and a pressure sensor, and the functional module is electrically connected to the monitoring probe (102).

12. The single cell battery according to claim 11, wherein the monitoring device (104) further comprises a wireless communication module, wherein the wireless communication module is electrically connected to the functional module and the monitoring probe (102), and the wireless communication module is used to transmit the internal temperature or pressure of the single cell battery.

13. The single cell according to claim 1 or 2, wherein a protective coating is provided on the outer side of the monitoring device (104).

14. A battery pack comprising a pack body and a single cell disposed in the pack body, wherein the single cell is the single cell according to claims 1-13.

15. An electrical device, comprising: the battery pack according to claim 14 or the single battery according to claims 1 to 13.

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