Battery cell, battery cell manufacturing method, aviation battery and aviation battery monitoring method

Abstract

The invention relates to a battery cell, a battery cell manufacturing method, an aviation battery and a monitoring method of the aviation battery. The battery cell includes a case and an electrode assembly housed within the case. The battery cell also includes one or more sensor tapes embedded between the electrode assembly and the case and helically wound around an outer circumferential surface of the electrode assembly. According to the battery unit, the manufacturing method of the battery unit, the aviation battery and the monitoring method of the aviation battery, the state of each battery unit in the aviation battery can be accurately detected in real time, the abnormity of a single battery unit can be detected earlier, the state monitoring of the battery unit is improved, and the reliability of the battery unit is improved. The safety performance of the battery unit and the battery comprising the battery unit is improved.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and more particularly, to battery cells, methods for manufacturing battery cells, aviation batteries, and methods for monitoring aviation batteries. Background Art

[0002] The content of this section only provides background information related to the present invention, which may not constitute prior art.

[0003] Batteries are widely used in various fields. For example, they are widely used in ground applications such as electric vehicles and energy storage stations, and also widely used in various applications in the aviation field. In various applications, the safety performance of batteries is crucial. Commercial batteries are generally formed by stacking multiple battery cells. The failure mode of a battery often starts with a single battery cell failing first, and then quickly causes adjacent battery cells to fail, and ultimately leads to the failure of the entire battery. In the prior art, the safety monitoring of batteries usually only involves detecting the current, voltage, and temperature signals of the battery, and often detects based on the entire battery, lacking the detection of the state of individual battery cells in the battery, and unable to give an early warning of the failure of individual battery cells. This means that when a battery failure is detected, relatively large safety problems may already have occurred. Compared with the conventional applications of batteries in other fields, the aviation field has higher safety requirements for batteries.

[0004] Improving the state monitoring of batteries and enhancing the safety performance of batteries is an improvement direction in the field of batteries. Summary of the Invention

[0005] One object of the present invention is to improve the state monitoring of battery cells and enhance the safety performance of battery cells. Another object of the present invention is to improve the method for manufacturing battery cells. Still another object of the present invention is to improve the method for monitoring aviation batteries and enhance the safety performance of aviation batteries.

[0006] One aspect of the present invention provides a battery cell, comprising: a housing; an electrode assembly, the electrode assembly being accommodated in the housing. The battery cell further includes one or more sensor bands, and the one or more sensor bands are embedded between the electrode assembly and the housing and spirally wound around the outer peripheral surface of the electrode assembly.

[0007] By spirally winding the sensor band around the outer peripheral surface of the electrode assembly, the sensor band is embedded at multiple longitudinal and circumferential positions between the housing and the electrode assembly of the battery cell, so that the parameters of the battery cell can be measured at multiple longitudinal and circumferential positions, improving the state monitoring of the battery cell, being able to detect abnormalities of the battery cell earlier, and enhancing the safety of use of the battery cell.

[0008] In one embodiment, the sensor strip is sealed between a pair of membranes.

[0009] After being sealed, the sensor strip is spirally wound around the outer peripheral surface of the electrode assembly. Thus, after the sensor strip is embedded in the battery cell, the sensor strip can be protected from being corroded by the electrolyte in the battery cell.

[0010] In one embodiment, the width of the pair of membranes corresponds to the height of the electrode assembly, and the longitudinal axis of the sensor strip is inclined relative to the longitudinal axis of the pair of membranes.

[0011] With the above arrangement, it is convenient to wind the pair of membranes sandwiching the sensor strip around the outer peripheral surface of the electrode assembly so that the sensor strip is spirally wound around the outer peripheral surface of the electrode assembly.

[0012] The sensor strip has a plurality of measurement points spaced apart from each other. At each measurement point, the sensor strip measures the strain and / or temperature of the battery cell.

[0013] By measuring the strain of the battery cell, the state of the physical and chemical reactions inside the battery cell can be judged, and the abnormality of the battery cell can be identified as early as possible.

[0014] Preferably, the sensor strip is an FBG sensor strip.

[0015] The battery cell is a pouch-type battery cell, a cylindrical battery cell or a prismatic battery cell.

[0016] In one embodiment, when the battery cell is a pouch-type battery cell and the housing is a flexible membrane, the flexible membrane can form one of the pair of membranes.

[0017] Another aspect of the present invention is to provide a method for manufacturing a battery cell, including: providing an electrode assembly of the battery cell; and accommodating the electrode assembly in a housing. The method for manufacturing the battery cell further includes: before accommodating the electrode assembly in the housing, spirally winding one or more sensor strips around the outer peripheral surface of the electrode assembly so that the one or more sensor strips are embedded between the electrode assembly and the housing.

[0018] The method for manufacturing the battery cell further includes: before winding one or more sensor strips around the outer peripheral surface of the electrode assembly, sealing the one or more sensor strips between a pair of membranes.

[0019] In one embodiment, the width of the pair of membranes corresponds to the height of the electrode assembly, and the longitudinal axis of the sensor strip is inclined relative to the longitudinal axis of the pair of membranes.

[0020] Preferably, the sensor strip is an FBG sensor strip.

[0021] The battery cell is a pouch battery cell, a cylindrical battery cell or a prismatic battery cell.

[0022] In one embodiment, when the battery cell is a pouch battery cell and the housing is a flexible film, the flexible film may form one of the pair of films described above.

[0023] Another aspect of the present invention is to provide an aircraft battery. The aircraft battery includes one or more battery cells according to the present invention.

[0024] Yet another aspect of the present invention is to provide a method for monitoring an aircraft battery. The aircraft battery includes one or more battery cells according to the present invention. The monitoring method includes: receiving measurement data of one or more sensor bands of each battery cell of the aircraft battery at a plurality of measurement points spaced apart from each other; and determining the state of each battery cell of the aircraft battery based on the measurement data.

[0025] The present invention provides a battery cell with improved safety performance, a method for manufacturing a battery cell, and an aircraft battery and a method for monitoring the same, which can detect the state of each battery cell in the aircraft battery in real time and accurately, detect abnormalities of a single battery cell earlier, improve the state monitoring of the battery cell, and improve the safety performance of the battery cell and the battery including the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The embodiments of the present invention will be described below by way of example only with reference to the drawings. In the drawings, the same features or components are denoted by the same reference numerals, and the drawings are not necessarily drawn to scale, and in the drawings:

[0027] Figure 1 A schematic diagram of a battery cell according to a first embodiment of the present invention is shown;

[0028] Figure 2 Shows Figure 1 A partial exploded view of the battery cell shown in

[0029] Figure 3 Shows Figure 1 The manufacturing process of the battery cell shown in

[0030] Figure 4 A schematic diagram of a battery cell according to a second embodiment of the present invention is shown;

[0031] Figure 5 Shows Figure 4 A schematic diagram of the battery cell shown in

[0032] Figure 6 Shows Figure 4 The manufacturing process of the battery cell shown in

[0033] Figure 7 Shows an exploded view of a battery cell according to a third embodiment of the present invention;

[0034] Figure 8 Shows Figure 7 the manufacturing process of the battery cell shown in; and

[0035] Figure 9 Shows a schematic diagram of an aviation battery according to the present invention. Detailed Description of the Invention

[0036] The following description is merely exemplary in nature and is not intended to limit the present invention and its applications and uses. It should be understood that in all these drawings, like reference numerals indicate the same or similar parts and features. Each drawing only schematically shows the concept and principle of the embodiment of the present invention, and does not necessarily show the specific dimensions and their ratios of each embodiment of the present invention. Specific parts in a specific drawing may be exaggerated to illustrate relevant details or structures of the embodiment of the present invention.

[0037] Figure 1 Shows a battery cell 10 according to a first embodiment of the present invention, Figure 2 shows a partial disassembled view of the battery cell 10. As Figure 1 and Figure 2 shown, the battery cell 10 includes a housing 11 and an electrode assembly 12 accommodated in the housing 11. The electrode assembly 12 includes multiple layers of a negative electrode 101, a positive electrode 102, and a separator 103, and the separator 103 is sandwiched between the negative electrode 101 and the positive electrode 102. A negative electrode tab 104 and a positive electrode tab 105 are respectively led out from the electrode assembly 12 through the housing 11. The battery cell 10 is a soft-pack battery cell. The housing 11 is a flexible film, such as an aluminum foil or an aluminum-plastic film.

[0038] As shown in the figure, the battery cell 10 further includes one or more sensor bands 106 embedded between the electrode assembly 12 and the housing 11. The sensor band 106 is flexible and has a plurality of measurement points spaced apart from each other. The sensor band 106 is spirally wound around the outer peripheral surface of the electrode assembly 12. This arrangement enables the sensor band 106 to contact multiple positions in the longitudinal and circumferential directions of the electrode assembly 12, and when the electrode assembly 12 and the housing 11 are installed in place, the sensor band 106 is embedded at multiple positions in the longitudinal and circumferential directions between the housing 11 and the electrode assembly 12, so as to be able to detect the parameters of the battery cell 10 at a plurality of measurement points spaced apart from each other. This is particularly advantageous when the electrode assembly 12 is a wound-type electrode assembly, because during the charging and discharging processes of the battery cell 10, the stress differences at different positions of the battery cell 10 are relatively large. By detecting the parameters of the battery cell 10 at multiple different positions, the actual state of the battery cell 10 can be judged in real time and accurately.

[0039] Preferably, at each measurement point of the sensor band 106, the sensor band 106 can detect the strain and / or temperature of the battery cell 10. For example, at a certain measurement point, both strain and temperature can be measured, while at another measurement point, only one of strain and temperature can be measured. Preferably, the sensor band 106 is an FBG sensor (fiber Bragg grating sensor) band and can be used to measure strain and temperature. The strain state inside the battery cell can usually reflect the state of the physical and chemical reactions inside the battery cell. Before the battery cell fails, gases and / or heat are often generated, resulting in an abnormal increase in strain. Therefore, by measuring the strain of the battery cell 10, the state of the physical and chemical reactions inside the battery cell 10 can be detected, which is conducive to early identification of the failure of the battery cell 10.

[0040] In addition, in order to prevent the sensor band 106 from being corroded by the electrolyte inside the battery cell 10, the sensor band 106 is sealed. In one example, the sensor band 106 can be sealed between a pair of membranes, for example, sealed between a pair of PP membranes.

[0041] Figure 3 The manufacturing process of the battery cell 10 is shown. As Figure 3As shown, first, one or more sensor bands 106 are placed on the first film P1. In the example shown in the figure, the width of the first film P1 generally corresponds to the height of the electrode assembly 12. For example, the width of the first film P1 is generally equal to the height of the electrode assembly 12. The sensor band 106 is placed on the first film P1 such that the longitudinal axis of the sensor band 106 is inclined relative to the longitudinal axis of the first film P1. The inclination angle of the longitudinal axis of the sensor band 106 relative to the longitudinal axis of the first film P1 can be reasonably set as needed. Then, the second film P2 is covered on the first film P1 to sandwich and seal the sensor band 106 between the first film P1 and the second film P2, forming a film assembly P, thereby preventing the sensor band 106 from being corroded by the electrolyte when embedded in the battery cell 10. The first film P1 and the second film P2 can be, for example, PP films. Next, the film assembly P with the sensor band 106 sealed therein is wound around the outer peripheral surface of the electrode assembly 12 such that the sensor band 106 is spirally wound on the outer peripheral surface of the electrode assembly 12. The film assembly P can be wound around the outer peripheral surface of the electrode assembly 12 for half a turn, one turn, or multiple turns as needed. In the example shown in the figure, the film assembly P is wound around the electrode assembly 12 such that the sensor band 106 is spirally wound 2 turns on the outer peripheral surface of the electrode assembly 12. Finally, the electrode assembly 12 with the sensor band 106 wound around its outer peripheral surface is placed in the housing 11 to form the battery cell 10. This arrangement enables the sensor band 106 to be embedded at multiple longitudinal and circumferential positions between the electrode assembly 12 and the housing 11, thereby enabling the parameters of the battery cell 10 to be measured at multiple longitudinal and circumferential positions of the battery cell 10.

[0042] In the example shown in the figure, only one sensor band 106 is shown sandwiched between the first film P1 and the second film P2. However, the present invention is not limited thereto. In other examples according to the present invention, multiple sensor bands 106 arranged side by side and spaced apart from each other can be provided.

[0043] In the example shown in the figure, the width of the first film P1 generally corresponds to the height of the electrode assembly 12, and the longitudinal axis of the sensor band 106 is inclined relative to the longitudinal axis of the first film P1 such that the width of the film assembly P generally corresponds to the height of the electrode assembly 12. When the film assembly P is wound around the outer peripheral surface of the electrode assembly 12, the sensor band 106 can be spirally wound on the electrode assembly 12 according to a predetermined pitch, and the wound electrode assembly has a generally uniform outer contour. However, the present invention is not limited thereto. In other examples according to the present invention, the width of the first film P1 can be set as needed as long as the first film P1 and the second film P2 can sandwich and seal the sensor band 106 and wind the sensor band 106 spirally on the outer peripheral surface of the electrode assembly 12.

[0044] In addition, in Figures 1-3In the illustrated example, the battery cell 10 is a pouch battery cell, and the housing 11 is a flexible film, such as an aluminum foil or an aluminum-plastic film. During the process of sealing the sensor strip 106, the flexible film forming the housing 11 can form one of the pair of films for sealing the sensor strip 106. For example, the flexible film can be covered onto the first film P1 to seal the sensor strip 106 between the first film P1 and the housing 11, without the need to provide a second film P2. Then, the housing 11 sealed with the sensor strip 106 is wound around the electrode assembly 12 to form the battery cell 10.

[0045] In the battery cell 10 according to the present invention, by interposing the sensor strip 106 between the housing 11 and the electrode assembly 12, the sensor strip 106 can detect the parameters of the battery cell 10 at multiple positions in the transverse and longitudinal directions of the battery cell 10, so that the state of the battery cell 10 can be monitored in real time and accurately, improving the safety of the battery cell 10.

[0046] Figure 4 A schematic diagram of a battery cell 20 according to a second embodiment of the present invention is shown. Figure 5 A schematic diagram of the battery cell 20 after removing the housing is shown.

[0047] As Figure 4 and Figure 5 shown, the battery cell 20 includes a housing 21 and an electrode assembly 22 accommodated in the housing 21. The battery cell 20 is a cylindrical battery cell. The housing 21 includes a housing body 211 and a cover assembly 212. The housing body 211 can be a steel or aluminum housing body. The battery cell 20 further includes one or more sensor strips 106 interposed between the electrode assembly 22 and the housing 21. As Figure 5 shown therein, the sensor strip 106 is spirally wound around the outer peripheral surface of the electrode assembly 22. The sensor strip 106 is preferably an FBG sensor strip and can be used to measure strain and temperature.

[0048] Figure 6 A manufacturing process of the battery cell 20 is shown. As Figure 6 shown, first, as Figure 3The manufacturing process of the battery cell 10 shown is similar. First, one or more sensor strips 106 are placed on the first film P1 such that the longitudinal axis of the sensor strip 106 is inclined with respect to the longitudinal axis of the first film P1. Then, the second film P2 is covered on the first film P1, and the sensor strip 106 is sealed between the first film P1 and the second film P2 to form a film assembly P. Next, the film assembly P is wound around the outer peripheral surface of the electrode assembly 22 such that the sensor strip 106 is helically wound on the outer peripheral surface of the electrode assembly 22. The film assembly P can be wound around the outer peripheral surface of the electrode assembly 22 for half a turn, one turn or multiple turns as required. Finally, the electrode assembly 22 with the sensor strip 106 wound around its outer peripheral surface is placed into the housing body 211, and the cover assembly 212 is installed to accommodate the electrode assembly 22 in the housing 21, forming the battery cell 20. This arrangement enables the sensor strip 106 to be embedded at multiple longitudinal and circumferential positions between the electrode assembly 22 and the housing 21 (more specifically, the housing body 211), so that the parameters of the battery cell 20 can be measured at multiple longitudinal and circumferential positions of the battery cell 20.

[0049] The battery cell 20 according to the second embodiment of the present invention can achieve the above-mentioned beneficial technical effects similar to those of the battery cell 10 according to the first embodiment of the present invention, can monitor the state of the battery cell 20 in real time and accurately, and improves the safety of the battery cell 20.

[0050] Figure 7 An exploded view of a battery cell 30 according to a third embodiment of the present invention is shown. As Figure 7 shown, the battery cell 30 is a square battery cell, including a housing 31 and an electrode assembly 32 accommodated in the housing 31. The housing 31 includes a housing body 311 and a cover plate 312. Electrode tabs 313, 314 are provided on the cover plate 312 and are respectively connected to the corresponding electrodes of the electrode assembly 32. The battery cell 30 further includes one or more sensor strips 106 embedded between the electrode assembly 32 and the housing 31. As Figure 7 shown, the sensor strip 106 is helically wound around the outer peripheral surface of the electrode assembly 32. The sensor strip 106 is preferably an FBG sensor strip and can be used to measure strain and temperature.

[0051] Figure 8 An illustration shows the manufacturing process of the battery cell 30. As Figure 8As shown, first, similar to the manufacturing processes of the aforementioned battery unit 10 and battery unit 20, first, one or more sensor strips 106 are placed on the first film P1 such that the longitudinal axis of the sensor strip 106 is inclined with respect to the longitudinal axis of the first film P1. Then, the second film P2 is covered on the first film P1, and the sensor strip 106 is sealed between the first film P1 and the second film P2 to form a film assembly P. Next, the film assembly P is wound around the outer peripheral surface of the electrode assembly 32 such that the sensor strip 106 is spirally wound around the outer peripheral surface of the electrode assembly 32. The film assembly P can be wound around the outer peripheral surface of the electrode assembly 32 for half a turn, one turn, or multiple turns as needed. Finally, the electrode assembly 32 with the sensor strip 106 wound around its outer peripheral surface is placed into the housing body 311, and the cover plate 312 is installed to accommodate the electrode assembly 32 in the housing 31, forming the battery unit 30. This arrangement enables the sensor strip 106 to be embedded at multiple longitudinal and circumferential positions between the electrode assembly 32 and the housing 31 (more specifically, the housing body 311), so as to be able to measure the parameters of the battery unit 30 at multiple longitudinal and circumferential positions of the battery unit 30.

[0052] The battery unit 30 according to the third embodiment of the present invention can achieve the above-mentioned beneficial technical effects similar to those of the battery unit 10 according to the first embodiment of the present invention and the battery unit 20 according to the second embodiment of the present invention, can monitor the state of the battery unit 30 in real time and accurately, and improves the safety of the battery unit 30.

[0053] Figure 9 A schematic diagram of a battery is shown, and this battery is, for example, an aviation battery 100. Alternatively, this battery can also be a battery for ground applications, such as a battery for a vehicle. The aviation battery 100 includes a plurality of battery units 110 connected to each other (in series or in parallel). Figure 9 Four battery units 110 of the aviation battery 100 are shown, and the four battery units 110 are connected in series with each other through connection tabs 120. However, the present invention is not limited thereto. In other examples according to the present invention, the aviation battery 100 can also include more or fewer battery units. Additionally, in Figure 9 the battery unit 110 is the same square battery unit as the battery unit 30. However, the present invention is not limited thereto, and the battery unit 110 can adopt any one of the battery units 10, 20, and 30 according to the present invention.

[0054] Since a sensor strip 106 is embedded in each battery cell 110 of the aviation battery 100, each battery cell in the aviation battery 100 can be detected at multiple positions. Particularly preferably, the sensor strip 106 of each battery cell detects the strain and temperature at multiple positions of the battery cell, so that the state of the physical and chemical reactions inside each battery cell can be detected in a timely manner, and the abnormality of a single battery cell in the aviation battery 100 can be detected earlier, thereby triggering corresponding alarms or protection measures and improving the safety of the aviation battery 100. The monitoring method of the aviation battery 100 includes receiving the measurement data of the sensor strip 106 of each battery cell of the aviation battery 100, and judging the state of each battery cell in the aviation battery 100 according to the received measurement data, so as to detect the abnormality of each battery cell of the aviation battery 100 as early as possible, trigger corresponding alarms or protection measures, and avoid the strain or heat generated by a single abnormal battery cell from spreading between adjacent battery cells and causing greater damage to the aviation battery 100.

[0055] The monitoring method of the aviation battery 100 further includes detecting the voltage and / or current of the aviation battery 100. For example, the voltage and / or current of a single battery cell 110 can be measured, or the voltage and / or current of the entire aviation battery 100 can be measured. By measuring the strain and temperature of each battery cell and combining with the measurement of the voltage and / or current of the aviation battery 100, earlier detection of the abnormality of each battery cell 110 of the aviation battery 100 can be better achieved. The above monitoring method of the aviation battery 100 can also be applied to other batteries including battery cells 110 (for example, batteries for vehicles).

[0056] Herein, exemplary embodiments of the battery cell, the battery cell manufacturing method, the aviation battery, and the monitoring method of the aviation battery of the present invention have been described in detail with reference to the accompanying drawings. However, it should be understood that the present invention is not limited to the specific embodiments described and illustrated above in detail. Without departing from the gist and scope of the present invention, those skilled in the art can make various modifications and variations to the present invention. All such modifications and variations fall within the scope of the present invention. Moreover, all components described herein can be replaced by other technically equivalent components.

Claims

1. A battery cell, comprising: a housing; an electrode assembly, the electrode assembly being received in the housing, characterized in that the battery cell further comprises one or more sensor bands, the one or more sensor bands being embedded between the electrode assembly and the housing and spirally wound around an outer peripheral surface of the electrode assembly.

2. The battery cell according to claim 1, wherein, the sensor band is sealed between a pair of membranes.

3. The battery cell according to claim 2, wherein, a width of the pair of membranes corresponds to a height of the electrode assembly, and a longitudinal axis of the sensor band is inclined with respect to a longitudinal axis of the pair of membranes.

4. The battery cell according to claim 1, wherein, the sensor band has a plurality of measurement points spaced apart from each other, and at each of the measurement points, the sensor band measures a strain and / or a temperature of the battery cell.

5. The battery cell according to any one of claims 1-4, wherein, the sensor band is an FBG sensor band.

6. The battery cell according to any one of claims 1-4, wherein, the battery cell is a pouch battery cell, a cylindrical battery cell or a prismatic battery cell.

7. The battery cell according to claim 2, wherein, the battery cell is a pouch battery cell, the housing is a flexible film, and the flexible film forms one of the pair of membranes.

8. A method for manufacturing a battery cell, comprising: providing an electrode assembly of a battery cell; and receiving the electrode assembly into a housing, characterized in that the method for manufacturing a battery cell further comprises: before receiving the electrode assembly into the housing, spirally winding one or more sensor bands around an outer peripheral surface of the electrode assembly such that the one or more sensor bands are embedded between the electrode assembly and the housing.

9. The method for manufacturing a battery cell according to claim 8, wherein, the method for manufacturing a battery cell further comprises: before winding the one or more sensor bands around the outer peripheral surface of the electrode assembly, sealing the one or more sensor bands between a pair of membranes.

10. The method for manufacturing a battery cell according to claim 9, wherein, a width of the pair of membranes corresponds to a height of the electrode assembly, and a longitudinal axis of the sensor band is inclined with respect to a longitudinal axis of the pair of membranes.

11. The method for manufacturing a battery cell according to any one of claims 8-10, wherein, the sensor band is an FBG sensor band.

12. The method for manufacturing a battery cell according to any one of claims 8-10, wherein, the battery cell is a pouch battery cell, a cylindrical battery cell or a prismatic battery cell.

13. The method for manufacturing a battery cell according to claim 9, wherein, the battery cell is a pouch battery cell, the housing is a flexible film, and the flexible film forms one of the pair of membranes.

14. An aircraft battery, characterized in that, the aircraft battery comprises one or more battery cells according to any one of claims 1-7.

15. A monitoring method for an aircraft battery, the aircraft battery comprising one or more battery cells according to any one of claims 1-7, the monitoring method comprising: receiving measurement data of the one or more sensor bands of each battery cell of the aircraft battery at a plurality of measurement points spaced apart from each other; and judging the state of each battery cell of the aircraft battery according to the measurement data.

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