Multifunctional battery cell and charging method and discharging method thereof

Abstract

The invention provides a multifunctional battery cell and a charging method and a discharging method thereof. The multifunctional battery cell comprises a first pole piece, a diaphragm and a second pole piece which are stacked in sequence, the first pole piece comprises a first current collector, a first tab, a second tab, a first active material layer and a second active material layer; the first current collector comprises a first insulating layer, a first conducting layer and a second conducting layer, the first conducting layer is arranged on the first surface of the first insulating layer, the second conducting layer is arranged on the second surface of the first insulating layer, the first surface of the first insulating layer and the second surface of the first insulating layer are oppositely arranged, and the first conducting layer is insulated relative to the second conducting layer; the first tab is electrically connected to the first conductive layer; the second tab is electrically connected to the second conductive layer; the first active material layer is disposed on the first conductive layer, and the second active material layer is disposed on the second conductive layer. The multifunctional battery cell provided by the invention can better adapt to different use scenes.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a multifunctional battery cell and a charging method and a discharging method thereof. Background Art

[0002] Batteries are increasingly used and have become an integral part of our daily lives. From portable electronic devices such as mobile phones and laptops to electric vehicles, advances in battery technology have greatly promoted the development of these fields. In addition, batteries also play a key role in medical devices, renewable energy storage, and military equipment. As the demand for more efficient and environmentally friendly battery technology continues to grow, researchers are developing new battery materials and designs to meet the growing energy demand. With the rapid development of science and technology, battery technology has penetrated into every aspect of our lives. In the home, devices such as cordless vacuum cleaners, smart watches, and remote-controlled toys all rely on battery power. In the industrial field, battery-powered robots and automated equipment are changing production processes and improving efficiency. In the field of transportation, in addition to electric vehicles, electric bicycles and electric scooters are gradually becoming part of urban transportation. The popularity of these devices not only reduces dependence on fossil fuels, but also helps reduce environmental pollution. In the application of batteries, some require higher charging and discharging efficiency, some require higher energy density, and some require stronger stability. However, the existing batteries cannot take into account the various requirements for batteries, so a battery that can take into account multiple requirements and adapt to more usage scenarios is needed. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a multifunctional battery cell that can better adapt to different usage scenarios.

[0004] The invention also provides a charging method for the multifunctional battery cell.

[0005] The invention also provides a discharge method for the multifunctional battery cell.

[0006] According to the first aspect of the present invention, the multifunctional battery cell comprises a first electrode sheet, a diaphragm and a second electrode sheet which are stacked, the diaphragm separating the first electrode sheet and the second electrode sheet, one of the first electrode sheet and the second electrode sheet being a positive electrode sheet and the other being a negative electrode sheet; the first electrode sheet comprises a first current collector, a first electrode tab, a second electrode tab, a first active material layer and a second active material layer; the first current collector comprises a first insulating layer, a first conductive layer and a second conductive layer, the first conductive layer being arranged on a first surface of the first insulating layer, the second conductive layer being arranged on a second surface of the first insulating layer, the first surface and the second surface being arranged back to back with each other, and the first conductive layer and the second conductive layer being separated by the first insulating layer; the first electrode tab is electrically connected to the first conductive layer, the second electrode tab is electrically connected to the second conductive layer, and the first electrode tab and the second electrode tab are arranged at intervals; the first active material layer is arranged on a side of the first conductive layer facing away from the first insulating layer, the second active material layer is arranged on a side of the second conductive layer facing away from the first insulating layer, and the performance of the first active material layer is different from that of the second active material layer.

[0007] The multifunctional battery cell according to the first embodiment of the present invention has at least the following beneficial effects: since an insulating layer is provided on the current collector, the first conductive layer and the second conductive layer are insulated from each other, thereby making the first active material layer and the second active material layer insulated from each other. In this way, a power storage part will be formed between the first active material layer and the second pole piece, and the second active material layer can form another independent power storage part. This sets the first active material layer and the second active material layer into two active materials with different characteristics. In this way, two different usage scenarios can be adapted respectively. So as to better adapt to different usage scenarios.

[0008] According to some embodiments of the present invention, the second pole piece includes a second current collector, a third pole tab, a fourth pole tab, a third active material layer and a fourth active material layer; the second current collector includes a second insulating layer, a third conductive layer and a fourth conductive layer, the third conductive layer is arranged on the first side of the second insulating layer, the fourth conductive layer is arranged on the second side of the second insulating layer, the first side of the second insulating layer and the second side of the second insulating layer are arranged back to back to each other, and the third conductive layer and the fourth conductive layer are separated by the second insulating layer; the third pole tab is electrically connected to the third conductive layer; the fourth pole tab is electrically connected to the fourth conductive layer; the third active material layer is arranged on the side of the third conductive layer facing away from the second insulating layer, and the fourth active material layer is arranged on the side of the fourth conductive layer facing away from the second insulating layer.

[0009] According to some embodiments of the present invention, the first pole piece is a positive pole piece.

[0010] According to some embodiments of the present invention, the first active material layer and the third active material layer are arranged correspondingly to form a first power storage unit, and perform a first charge and discharge reaction, and the energy density of the first power storage unit is A; the second active material layer and the fourth active material layer are arranged correspondingly to form a second power storage unit, and perform a second charge and discharge reaction, and the energy density of the second power storage unit is B, and B is greater than A; the charge and discharge rate of the first charge and discharge reaction is greater than the charge and discharge rate of the second charge and discharge reaction.

[0011] According to some embodiments of the present invention, the content of the binder in the first active material layer is greater than the content of the binder in the second active material layer, and / or the content of the binder in the third active material layer is greater than the content of the binder in the fourth active material layer.

[0012] According to some embodiments of the present invention, the first pole tab and the second pole tab are spaced apart from each other in the extension direction of the first pole piece.

[0013] According to some embodiments of the present invention, the first current collector further includes a first anti-oxidation layer and a second anti-oxidation layer, the first anti-oxidation layer is arranged on a side of the first conductive layer facing away from the first insulating layer, the second anti-oxidation layer is arranged on a side of the second conductive layer facing away from the first insulating layer, the first active material layer is arranged on a side of the first anti-oxidation layer facing away from the first insulating layer, and the second active material layer is arranged on a side of the second anti-oxidation layer facing away from the first insulating layer.

[0014] According to some embodiments of the present invention, the first current collector further includes a first bonding layer and a second bonding layer, the first bonding layer is disposed between the first insulating layer and the first conductive layer, and the second bonding layer is disposed between the first insulating layer and the second conductive layer.

[0015] A charging method for a multifunctional battery cell according to an embodiment of the second aspect of the present invention is used to charge the multifunctional battery cell described in any one of the above embodiments, including: first charging the first active material layer and then charging the second active material layer; or, charging the first active material layer and the second active material layer at the same time; or, charging the first active material layer and the second active material layer alternately.

[0016] The discharge method of the multifunctional battery cell according to the third aspect of the present invention is used to discharge the multifunctional battery cell described in any one of the above embodiments, including: first discharging the first active material layer and then discharging the second active material layer; or, discharging the first active material layer and the second active material layer at the same time; or, discharging the first active material layer and the second active material layer alternately.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 is a schematic diagram of the overall structure of a multifunctional battery cell in some embodiments of the present invention; Figure 2 Schematic diagram of the internal structure of a multifunctional battery cell in some embodiments of the present invention; Figure 3 is a schematic top view of a first current collector of a multifunctional battery cell in some embodiments of the present invention; Figure 4 A schematic diagram of the structure of a first current collector of a multifunctional battery cell in some embodiments of the present invention; Figure 5 Schematic diagram of the external structure of a multifunctional battery cell in some embodiments of the present invention.

[0019] Reference numerals: 1. First pole piece; 11. First current collector; 111. First insulating layer; 112. First conductive layer; 113. Second conductive layer; 114. First bonding layer; 115. Second bonding layer; 116. First anti-oxidation layer; 117. Second anti-oxidation layer; 12. First active material layer; 13. Second active material layer; 2. Second pole piece; 21. Second current collector; 211. Second insulating layer; 212. Third conductive layer; 213. Fourth conductive layer; 22. Third active material layer; 23. Fourth active material layer; 3. Diaphragm; 4. First pole lug; 5. Second pole lug; 6. Third pole lug; 7. Fourth pole lug. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0021] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0023] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0024] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The multifunctional battery cell of the first embodiment of the present invention comprises: a first pole piece 1, a diaphragm 3 and a second pole piece 2 stacked in sequence. After the first pole piece 1, the diaphragm 3 and the second pole piece 2 are stacked, a laminated battery cell can be formed, or a rolled battery cell can be formed by winding. At the same time, a soft-pack battery cell can be formed by wrapping with an aluminum-plastic film.

[0025] The first pole piece 1 includes a first current collector 11, a first pole tab 4, a second pole tab 5, a first active material layer 12, and a second active material layer 13; the first current collector 11 includes a first insulating layer 111, a first conductive layer 112, and a second conductive layer 113, the first conductive layer 112 is arranged on the first surface of the first insulating layer 111, the second conductive layer 113 is arranged on the second surface of the first insulating layer 111, the first surface of the first insulating layer 111 and the second surface of the first insulating layer 111 are arranged opposite to each other, and the first conductive layer 112 is insulated relative to the second conductive layer 113; the first pole tab 4 is electrically connected to the first conductive layer 112; the second pole tab 5 is electrically connected to the second conductive layer 113; the first active material layer 12 is arranged on the first conductive layer 112, and the second active material layer 13 is arranged on the second conductive layer 113. When the first pole tab 4 and the second pole piece 2 are connected, charging and discharging can be performed. At this time, only the first active material layer 12 electrically connected to the first pole tab 4 is charged and discharged. When the second pole tab 5 and the second pole piece 2 are connected, charging and discharging can also be performed. At this time, only the second active material layer 13 electrically connected to the second pole ear 5 is charged and discharged. The first active material layer 12 and the second active material layer 13 are set as anode active materials or cathode active materials with different characteristics, so that when the first pole ear 4 and the second pole ear 5 are connected respectively, the multifunctional battery cell will show different characteristics. For example, a larger energy density, a faster charging speed and a higher stability. In this way, the first active material layer 12 or the second active material layer 13 can be quickly switched for charging and discharging in different usage scenarios, or the first pole ear 4 and the second pole ear 5 are connected at the same time, so that the first active material layer 12 and the second active material layer 13 are discharged simultaneously.

[0026] The second pole piece corresponding to the first pole piece can be arranged so that the two sides of the second current collector are interconnected. That is, the second pole piece includes the second current collector, and the third active material layer 22 and the fourth active material layer 23 are arranged on both sides of the second current collector, wherein the third active material layer 22 and the fourth active material layer 23 are the same, and the third active material layer 22 and the fourth active material layer 23 are electrically connected to each other. At this time, the power supply formed by the second pole piece and the first active material layer has one characteristic, and the power supply formed by the second pole piece and the second active material layer has another characteristic.

[0027] According to some embodiments of the present invention, the second pole piece 2 includes a second current collector 21, a third pole tab 6, a fourth pole tab 7, a third active material layer 22 and a fourth active material layer 23; the second current collector 21 includes a second insulating layer 211, a third conductive layer 212 and a fourth conductive layer 213, the third conductive layer 212 is arranged on the first surface of the second insulating layer 211, the fourth conductive layer 213 is arranged on the second surface of the second insulating layer 211, the first surface of the second insulating layer 211 and the second surface of the second insulating layer 211 are arranged opposite to each other, and the third conductive layer 212 is insulated from the fourth conductive layer 213; the third pole tab 6 is electrically connected to the third conductive layer 212; the fourth pole tab 7 is electrically connected to the fourth conductive layer 213; the third active material layer 22 is arranged on the third conductive layer 212, and the fourth active material layer 23 is arranged on the fourth conductive layer 213. When the first active material layer 12 and the second active material layer 13 are set to have different characteristics, the active material layer of the other pole that is better adapted thereto also needs to be adjusted. Therefore, it is necessary to set a third active material layer 22 that can better adapt to the first active material layer 12, and a fourth active material layer 23 that can better adapt to the second active material layer 13. That is, when the first pole ear 4 is connected, the other pole is connected to the third pole ear 6. When the second pole ear 5 is connected, the other pole is connected to the fourth pole ear 7. Thus, two independent power storage parts are formed. At the same time, charging and discharging can also be performed in some scenarios. For example, the power storage part formed by the first active material layer 12 and the third active material layer 22 is discharged, while the power storage part formed by the second active material layer 13 and the fourth active material layer 23 is charged.

[0028] According to some embodiments of the present invention, the first electrode sheet 1 is a positive electrode sheet. When the first electrode sheet 1 is set as a positive electrode sheet, the first active material layer 12 and the second active material layer 13 are both cathode active materials. The cathode active material has a greater impact on the performance of the battery cell, so setting the first electrode sheet 1 as a positive electrode sheet allows the multifunctional battery cell to better adapt to different usage scenarios.

[0029] According to some embodiments of the present invention, the first active material layer 12 and the third active material layer 22 are arranged correspondingly to form a first power storage unit, and a first charge-discharge reaction is performed, and the energy density of the first power storage unit is A; the second active material layer 13 and the fourth active material layer 23 are arranged correspondingly to form a second power storage unit, and a second charge-discharge reaction is performed, and the energy density of the second power storage unit is B; the charge-discharge rate of the first charge-discharge reaction is greater than the charge-discharge rate of the second charge-discharge reaction, and the energy density B of the second power storage unit is greater than the energy density A of the first power storage unit. In the application process of the battery cell, it is most common that some usage scenarios require faster charge-discharge speeds, while some scenarios require faster energy density. Therefore, the first power storage unit and the second power storage unit are set as two active materials with different characteristics. Among them, on mobile devices such as mobile phones and cars, when the power of the battery cell is less, a faster charging speed is required. After the device has a certain amount of power, it is more important to store more power by increasing the energy density of the battery cell. At this time, the first active material layer 12 can be set as an active material with a faster charge and discharge speed, and the second active material layer 13 can be set as an active material with a higher energy density, so as to better adapt to the use scenarios of mobile devices such as mobile phones and cars.

[0030] Among them, in the existing battery cell manufacturing, according to actual needs, the existing technical means can be used to adjust the active materials of the positive or negative electrode to adjust the energy density of the battery cell or the charging and discharging speed of the battery cell. Taking the negative electrode sheet as an example, the use of small particles of graphite or reducing the compaction density of the active material on the negative electrode sheet can speed up the charging and discharging speed on the negative electrode sheet; conversely, the use of large particles of graphite or increasing the compaction density of the active material on the negative electrode sheet can increase the energy density of the negative electrode sheet. At the same time, silicon carbon can be used instead of graphite as the active material on the negative electrode sheet to increase the energy density of the negative electrode sheet. On the positive electrode sheet, nickel can be added to the active material to increase the energy density of the positive electrode sheet. In the manufacture of the battery cell, there are a variety of positive electrode active materials and a variety of negative electrode active materials. A variety of positive electrode active materials and a variety of negative electrode active materials have different properties. Active materials and formulas with different properties can be selected according to needs. Among them, lithium cobalt oxide can be used to select a positive electrode active material with a larger energy density, and lithium iron phosphate can be used to select a positive electrode active material with a stronger safety but a lower energy density. At the same time, it is also possible to select from existing active materials according to the requirements of various properties of the active materials, for example, the positive electrode active material or the negative electrode active material requires a faster charging speed or requires a stronger voltage adaptability, etc.

[0031] According to some embodiments of the present invention, the content of the binder in the first active material layer 12 is greater than the content of the binder in the second active material layer 13, and / or the content of the binder in the third active material layer 22 is greater than the content of the binder in the fourth active material layer 23. When there is more binder in the active material layer, the stability of the active material layer is better. When the current fluctuation of the charging power source or the device using the battery cell is large, the battery cell needs to have higher stability, thereby improving the service life of the battery cell. Therefore, the content of the binder in the first active material layer 12 is greater than the content of the binder in the second active material layer 13, so that the first active material layer 12 has higher stability. When the current fluctuation of the charging power source or the device using the battery cell is large, the first active material layer 12 is used for charging and discharging.

[0032] According to some embodiments of the present invention, the first pole tab 4 and the second pole tab 5 are alternately arranged in the extension direction of the first pole sheet 1. The first pole tab 4 and the second pole tab 5 are arranged in a simplified manner to avoid contact between the first pole tab 4 and the second pole tab 5, thereby avoiding insulation failure between the first active material layer 12 and the second active material layer 13.

[0033] According to some embodiments of the present invention, the first current collector 11 further includes a first anti-oxidation layer 116 and a second anti-oxidation layer 117, wherein the first anti-oxidation layer 116 is disposed on the side of the first conductive layer 112 facing away from the first insulating layer 111, and the second anti-oxidation layer 117 is disposed on the side of the second conductive layer 113 facing away from the first insulating layer 111. The role of the anti-oxidation layer on the current collector is crucial, as it not only ensures that the current collector material is protected from the threat of oxidation during the operation of the battery cell, but also significantly improves the overall performance and reliability of the battery cell through this protective measure. Oxidation is one of the common chemical reactions inside the battery cell, which causes changes in the structure and chemical properties of the current collector material, thereby affecting the electrochemical performance and stability of the battery cell. The introduction of the anti-oxidation layer effectively constructs a barrier to prevent direct contact between oxygen and the current collector, thereby avoiding the occurrence of oxidation reactions. In addition, the presence of the anti-oxidation layer also has a positive effect on the electrochemical performance of the battery cell. It can reduce the resistance inside the battery cell, making the transmission of electrons inside the battery cell smoother, thereby improving the charge and discharge efficiency of the battery cell. During the charge and discharge process of the battery cell, the smooth flow of current is one of the key factors to ensure the stability of the battery cell performance. The addition of the anti-oxidation layer ensures the efficient transmission of current inside the battery cell, which is crucial to extending the service life of the battery cell and improving its working performance. The current collector not only protects the current collector from damage, but also optimizes the electrochemical environment inside the battery cell, allowing the battery cell to operate more efficiently.

[0034] According to some embodiments of the present invention, the first current collector 11 further includes a first adhesive layer 114 and a second adhesive layer 115, wherein the first adhesive layer 114 is disposed between the first insulating layer 111 and the first conductive layer 112, and the second adhesive layer 115 is disposed between the first insulating layer 111 and the second conductive layer 113. The first insulating layer 111 may be a plastic film, and the first adhesive layer 114 and the second adhesive layer 115 are disposed so that when the first conductive layer 112 and the second conductive layer 113 are disposed, the connection between the first insulating layer 111 and the second conductive layer 113 is more firmly established.

[0035] The charging method of the multifunctional battery cell according to the second aspect of the present invention is used to charge the multifunctional battery cell of any one of the above embodiments, including: first charging the first active material layer 12, and then charging the second active material layer 13; or, charging the first active material layer 12 and the second active material layer 13 at the same time; or, charging the first active material layer 12 and the second active material layer 13 alternately. When charging the multifunctional battery cell, it can be charged in a variety of ways according to the usage scenario and the different characteristics of the first active material layer 12 and the second active material layer 13, and different charging methods can also be formulated by the system learning the usage habits of specific users.

[0036] The discharge method of the multifunctional battery cell according to the third aspect of the present invention is characterized in that it is used to discharge the multifunctional battery cell of any one of the above embodiments, including: first discharging the first active material layer 12, and then discharging the second active material layer 13; or, discharging the first active material layer 12 and the second active material layer 13 simultaneously; or, alternately discharging the first active material layer 12 and the second active material layer 13. When discharging the multifunctional battery cell, multiple discharge modes can be performed according to different requirements of the use scenario, and different characteristics of the first active material layer 12 and the second active material layer 13 can also be set according to different scenarios that need to be adapted.

[0037] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A multifunctional battery cell, characterized in that: It comprises a first pole piece, a diaphragm and a second pole piece which are stacked, the diaphragm separates the first pole piece and the second pole piece, one of the first pole piece and the second pole piece is a positive pole piece, and the other is a negative pole piece; The first pole piece includes a first current collector, a first pole tab, a second pole tab, a first active material layer and a second active material layer; The first current collector includes a first insulating layer, a first conductive layer, and a second conductive layer, wherein the first conductive layer is arranged on a first surface of the first insulating layer, and the second conductive layer is arranged on a second surface of the first insulating layer, the first surface and the second surface are arranged opposite to each other, and the first conductive layer and the second conductive layer are separated by the first insulating layer; the first electrode tab is electrically connected to the first conductive layer, the second electrode tab is electrically connected to the second conductive layer, and the first electrode tab and the second electrode tab are arranged at intervals; The first active material layer is disposed on a side of the first conductive layer facing away from the first insulating layer, and the second active material layer is disposed on a side of the second conductive layer facing away from the first insulating layer. The performance of the first active material layer is different from that of the second active material layer.

2. The multifunctional battery cell according to claim 1, characterized in that: The second pole piece includes a second current collector, a third pole lug, a fourth pole lug, a third active material layer and a fourth active material layer; The second current collector comprises a second insulating layer, a third conductive layer and a fourth conductive layer, wherein the third conductive layer is arranged on a first surface of the second insulating layer, the fourth conductive layer is arranged on a second surface of the second insulating layer, the first surface of the second insulating layer and the second surface of the second insulating layer are arranged back to back, and the third conductive layer and the fourth conductive layer are separated by the second insulating layer; the third electrode tab is electrically connected to the third conductive layer; and the fourth electrode tab is electrically connected to the fourth conductive layer; The third active material layer is disposed on a side of the third conductive layer facing away from the second insulating layer, and the fourth active material layer is disposed on a side of the fourth conductive layer facing away from the second insulating layer.

3. The multifunctional battery cell according to claim 1, characterized in that: The first electrode is a positive electrode.

4. The multifunctional battery cell according to claim 2, characterized in that: The first active material layer and the third active material layer are arranged correspondingly to form a first power storage unit and perform a first charge and discharge reaction, and the energy density of the first power storage unit is A; the second active material layer and the fourth active material layer are arranged correspondingly to form a second power storage unit and perform a second charge and discharge reaction, and the energy density of the second power storage unit is B, and B is greater than A; the charge and discharge speed of the first charge and discharge reaction is greater than the charge and discharge speed of the second charge and discharge reaction.

5. The multifunctional battery cell according to claim 2, characterized in that: The content of the binder in the first active material layer is greater than that in the second active material layer, and / or the content of the binder in the third active material layer is greater than that in the fourth active material layer.

6. The multifunctional battery cell according to claim 1, characterized in that: The first pole tab and the second pole tab are spaced apart from each other in an extending direction of the first pole piece.

7. The multifunctional battery cell according to claim 1, characterized in that: The first current collector also includes a first anti-oxidation layer and a second anti-oxidation layer, the first anti-oxidation layer is arranged on the side of the first conductive layer facing away from the first insulating layer, the second anti-oxidation layer is arranged on the side of the second conductive layer facing away from the first insulating layer, the first active material layer is arranged on the side of the first anti-oxidation layer facing away from the first insulating layer, and the second active material layer is arranged on the side of the second anti-oxidation layer facing away from the first insulating layer.

8. The multifunctional battery cell according to claim 1, characterized in that: The first current collector further includes a first bonding layer and a second bonding layer, wherein the first bonding layer is disposed between the first insulating layer and the first conductive layer, and the second bonding layer is disposed between the first insulating layer and the second conductive layer.

9. A method for charging a multifunctional battery cell, characterized in that: Used to charge the multifunctional battery cell according to any one of claims 1 to 8, comprising: Firstly charge the first active material layer, and then charge the second active material layer; or, charging the first active material layer and the second active material layer simultaneously; Alternatively, the first active material layer and the second active material layer are charged alternately.

10. A discharge method for a multifunctional battery cell, characterized in that: Used to discharge the multifunctional battery cell according to any one of claims 1 to 8, comprising: Firstly, the first active material layer is discharged, and then the second active material layer is discharged; or, discharging the first active material layer and the second active material layer simultaneously; Alternatively, the first active material layer and the second active material layer are discharged alternately.

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