A secondary battery with a transfer electrode and an electric device

Abstract

This invention discloses a secondary battery with a transfer electrode and an electrical device thereof. The secondary battery with the transfer electrode includes a positive electrode, a negative electrode body, a negative current collector layer, an extended negative current collector, and an electrolyte. The positive electrode and the negative electrode body are in contact with the electrolyte. The positive electrode, the negative electrode body, and the extended negative current collector are spaced apart. The extended negative current collector is positioned above the positive electrode. The distance between the positive electrode and the negative electrode body is greater than the distance between the positive electrode and the extended negative current collector. The negative electrode body is electrically connected to the negative current collector layer, and the negative current collector layer is used to electrically connect to the extended negative current collector. The secondary battery with the transfer electrode disclosed in this invention can solve the technical problem that existing flexible batteries are prone to forming metal dendrites during charging and discharging, which can cause short circuits and other faults, severely reducing battery life and posing safety hazards.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of batteries, and particularly relates to a secondary battery with a transferred electrode and an electric device. BACKGROUND

[0002] With the development of the Internet of Things and the flexible electronic industry, flexible batteries are increasingly valued due to their simple production process and flexible application scenarios. Due to the development of low-power chips, the use of flexible batteries with lower capacity but more portable and flexible electrode design space has more electrode design space.

[0003] However, during the charging and discharging process of the battery, metal dendrites are easily formed between the positive and negative electrodes. The accumulation of metal dendrites will cause a short circuit, leading to battery failure, which seriously reduces the service life of the battery, and may even cause safety accidents. Therefore, the structure optimization of the low-capacity flexible battery can improve the charging and discharging cycle times of the flexible battery without increasing the cost of equipment and process. SUMMARY

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a secondary battery with a transferred electrode, which aims to solve the technical problems that the existing flexible battery is prone to form metal dendrites during the charging and discharging process, thereby causing short circuit and other failures, which seriously reduces the service life of the battery and has safety hazards.

[0005] In order to achieve the purpose of the present application, the technical scheme adopted by the present application is as follows:

[0006] A secondary battery with a transferred electrode, the secondary battery with a transferred electrode comprises a positive electrode, a negative electrode body, a negative current collector layer, an expanded negative current collector and an electrolyte; wherein:

[0007] The positive electrode, the negative electrode body and the electrolyte are in contact, the positive electrode is arranged apart from the negative electrode body and the expanded negative current collector, the expanded negative current collector is arranged above the positive electrode, the distance between the positive electrode and the negative electrode body is greater than the distance between the positive electrode and the expanded negative current collector, the negative electrode body is electrically connected with the negative current collector layer, and the negative current collector layer is used to be electrically connected with the expanded negative current collector.

[0008] Further, the secondary battery with a transferred electrode further comprises an isolation layer, and the isolation layer is arranged between the positive electrode and the expanded negative current collector.

[0009] Further, the isolation layer covers the negative electrode body.

[0010] Further, the isolation layer is a flexible diaphragm and / or a porous layer.

[0011] Further, the negative electrode bodies are multiple, and the negative current collector layers are multiple, the multiple negative electrode bodies are electrically connected with the multiple negative current collector layers, and the multiple negative current collector layers are used for being electrically connected with the extended negative current collector.

[0012] Further, the transfer electrode secondary battery comprises a first flexible substrate, and the negative current collector layer and the extended negative current collector are arranged on the first flexible substrate.

[0013] Further, the transfer electrode secondary battery comprises an insulating frame, a first flexible substrate and a second flexible substrate, wherein:

[0014] The insulating frame encloses the positive electrode, the negative electrode body and the electrolyte, the first flexible substrate is covered on one side end surface of the insulating frame, and the second flexible substrate is used for covering the other side end surface of the insulating frame.

[0015] The negative current collector layer is arranged on the first flexible substrate, the extended negative current collector is arranged on the second flexible substrate, the negative current collector layer is used for being in contact with the extended negative current collector, and the contact part of the negative current collector layer and the extended negative current collector is located within the enclosing range of the insulating frame.

[0016] Further, the transfer electrode secondary battery comprises an insulating frame, a first flexible substrate and a second flexible substrate, wherein:

[0017] The insulating frame encloses the positive electrode, the negative electrode body and the electrolyte, the first flexible substrate is covered on one side end surface of the insulating frame, and the second flexible substrate is used for covering the other side end surface of the insulating frame.

[0018] The negative current collector layer is arranged on the first flexible substrate, the extended negative current collector is arranged on the second flexible substrate, the negative current collector layer is used for being in contact with the extended negative current collector, and the contact part of the negative current collector layer and the extended negative current collector is located within the enclosing range of the insulating frame.

[0019] Further, the first flexible substrate is used for being folded, and the part of the first flexible substrate covered on the other side end surface of the insulating frame after folding constitutes the second flexible substrate.

[0020] Further, the negative electrode body is a metal piece.

[0021] Alternatively, the negative electrode body and the negative current collector layer are an integrally formed metal piece.

[0022] Correspondingly, the application further provides a power utilization device, which comprises the transfer electrode secondary battery as described above.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] The secondary battery with transferred electrode provided by the present application contacts the positive electrode, the negative electrode body and the electrolyte, and the positive electrode is arranged apart from the extended negative current collector (the extended negative current collector is electrically connected to the negative electrode body through the negative current collector layer), and the distance between the positive electrode and the negative electrode body is greater than the distance between the positive electrode and the extended negative current collector. Thus, during the charging process of the battery, the field strength distribution is the largest at the gap between the positive electrode and the extended negative current collector due to the effect of the applied voltage, and the positive and negative charges are gathered here. At this time, the metal ions preferentially obtain electrons on the extended negative current collector close to the positive electrode and are reduced into metal electrodes. After the discharge process is completed, the negative electrode active material is preferentially deposited on the extended negative current collector which is not easy to grow dendrites and corresponds to a larger area of the positive electrode by using the change of the electric field strength, thereby completing the process of transferring the negative electrode active material from the negative electrode body to the extended negative current collector. The structural design of the present application can inhibit the growth of metal dendrites between the positive electrode and the negative electrode body, and improve the charging efficiency, thereby increasing the charging and discharging times of the flexible battery without changing the electrode and electrolyte formula, and prolonging the cycle life of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor based on the drawings shown.

[0026] Figure 1 The cross-sectional structure schematic diagram of the first embodiment of the secondary battery with transferred electrode of the present application;

[0027] Figure 2 The cross-sectional structure schematic diagram of the second embodiment of the secondary battery with transferred electrode of the present application;

[0028] Figure 3 The cross-sectional structure schematic diagram of the third embodiment of the secondary battery with transferred electrode of the present application;

[0029] Figure 4 The cross-sectional structure schematic diagram of the fourth embodiment of the secondary battery with transferred electrode of the present application;

[0030] Figure 5 The cross-sectional structure schematic diagram of the fifth embodiment of the secondary battery with transferred electrode of the present application;

[0031] Figure 6This is a schematic cross-sectional view of the sixth embodiment of the secondary battery with the transfer electrode of the present invention.

[0032] Figure 7 This is a top cross-sectional view of the sixth embodiment of the secondary battery with the transfer electrode of the present invention.

[0033] Figure 8 This is a cross-sectional structural schematic diagram of the seventh embodiment of the secondary battery with the transfer electrode of the present invention;

[0034] Figure 9 This is a cross-sectional top view of the seventh embodiment of the secondary battery with the transfer electrode of the present invention;

[0035] Figure 10 This is a top-view cross-sectional view of the secondary battery structure before the folding operation in the eighth embodiment of the transfer electrode of the present invention.

[0036] Figure 11 This is a schematic cross-sectional view of the secondary battery after the folding operation in the eighth embodiment of the transfer electrode of the present invention.

[0037] Figure 12 This is a cross-sectional structural schematic diagram of the ninth embodiment of the secondary battery with the transfer electrode of the present invention.

[0038] Figure 13 This is a cross-sectional structural schematic diagram of the tenth embodiment of the secondary battery with the transfer electrode of the present invention.

[0039] Explanation of icon numbers:

[0040] Reference Name Reference Name 1 Positive electrode 6 First flexible substrate 2 Negative electrode body 7 Second flexible substrate 3 Negative current collector layer 8 Insulating frame 4 Extended negative current collector 9 Isolation layer 5 Electrolyte

[0041] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0044] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0045] Reference Figure 1 The embodiments of the present application provide a transfer electrode secondary battery, which comprises a positive electrode 1, a negative electrode body 2, a negative current collector layer 3, an extended negative current collector 4 and an electrolyte 5; wherein:

[0046] The positive electrode 1, the negative electrode body 2 and the electrolyte 5 are in contact, the positive electrode 1 is arranged between the negative electrode body 2 and the extended negative current collector 4, the extended negative current collector 4 is arranged above the positive electrode 1, the distance between the positive electrode 1 and the negative electrode body 2 is greater than the distance between the positive electrode 1 and the extended negative current collector 4, the negative electrode body 2 is electrically connected with the negative current collector layer 3, and the negative current collector layer 3 is used for electrically connecting with the extended negative current collector 4.

[0047] In the present embodiment, the electrolyte 5 can be a gel or liquid electrolyte, which is used to react with the electrode to generate electric energy, and the electrolyte 5 can be used to conduct ions and form electrical isolation. The electrolyte 5 can be laid on a flexible substrate and surrounded by a limiting member to prevent outward overflow.

[0048] The surface of the positive electrode 1 and the negative electrode body 2 can be covered with an active material layer capable of electrochemical reaction with the electrolyte 5 (such as nickel oxide, silver oxide and the like which can react with alkaline electrolyte in alkaline battery, in addition to which other active substances which can react with the corresponding electrolyte in lithium battery, zinc battery, specific reference can be made to the prior art, which is not described here), the active material layer reacts with the electrolyte 5 to generate electric energy and can be transmitted to the electric device to achieve the function of power supply for the electric device. In addition, the negative electrode body 2 can also directly use metal parts (such as metal sheet, metal strip and the like), which can also achieve the effect of electrochemical reaction with the electrolyte 5 and generate electric energy. The metal part can be used as a current collector due to its good conductivity, but when the metal part is thin, the metal part is preferably attached to the current collector.

[0049] Research has revealed that during the charging process of existing flexible coplanar batteries, the electric field strength is greatest at the gap between the positive electrode 1 and the negative electrode 2, and the metal deposition area is relatively small. This makes it easy for metal dendrites to form at the gap, leading to short circuits and other malfunctions. For flexible sandwich structures, the extended negative current collector 4 on the positive electrode 1 needs to be uniformly covered with active material. However, when the extended negative current collector 4 is a porous structure such as carbon cloth or carbon paper, the uniformity of the active material coating is not as good as that of electrodes prepared by electroplating. Therefore, there is a significant amount of non-reactive active material on the porous structure.

[0050] Based on the above problems, this embodiment connects the positive electrode 1 with the extended negative collector 4 (e.g., Figure 1 As shown), the negative collector layer 3 is in contact with the negative electrode body 2, and the extended negative collector 4 can be spaced apart from the negative collector layer 3 and electrically connected through the electrolyte 5; in another embodiment, the extended negative collector 4 can also be directly in contact with the negative collector layer 3 to achieve electrical connection. In this case, the extended negative collector 4 and the negative collector layer 3 are arranged in the same way, and the distance between the positive electrode 1 and the negative electrode body 2 is greater than the distance between the positive electrode 1 and the extended negative collector 4. Thus, during the discharge process of this flexible battery, as the charge is conducted to the external current, the metal on the negative electrode 2 continuously oxidizes to form metal ions, which are released into the electrolyte 5. After release, the metal ions diffuse into the electrolyte 5 (specifically, the electrolyte solution) without affecting the subsequent discharge reaction. During the charging process of this flexible battery, due to the effect of the applied voltage, the electric field strength is greatest at the location where the positive electrode 1 and the negative electrode 2 are close together (i.e., at the gap between the positive electrode 1 and the negative current collector layer 3), where positive and negative charges accumulate. At this time, metal ions preferentially gain electrons on the extended negative current collector 4 near the positive electrode 1 and are reduced to metal electrodes, thus completing the process of the negative electrode transferring from the negative electrode 2 to the extended negative current collector 4. This can suppress the growth of metal dendrites between the positive electrode 1 and the negative electrode 2, reduce the risk of battery short circuit, eliminate safety hazards, and increase the number of charge and discharge cycles of the flexible battery without changing the electrode and electrolyte 5 formulations, thereby extending the battery's cycle life.

[0051] Preferably, the extended negative collector 4 can be configured as a porous structure (such as conductive fiber structure such as carbon cloth or carbon paper). It can also form uniform nucleation sites by means of treatment such as adding a small amount of active material, plasma treatment, or hydrophilic-hydrophobic coating, so that the metal electrode formed by the reduction of metal ions after gaining electrons can be more uniformly distributed on the extended negative collector 4, thereby reducing non-uniform metal deposition and further suppressing the formation of metal dendrites.

[0052] Further, as the number of charge and discharge cycles increases, the positive electrode 1 and the generated negative electrode active material gradually approach each other, the ion transport distance of the electrolyte 5 is shortened, the internal resistance of the battery is reduced, and thus the available capacity of the battery under the same cut-off voltage is increased.

[0053] In addition, for the secondary battery, in the conventional production process, the product after discharging the electrode is coated on the positive electrode 1 and the negative electrode body 2, and then the battery is activated by charging (i.e. formation step). The embodiment transfers the concentrated electrode material to the extended negative collector 4 uniformly through the repeated charging and discharging process, which reduces the plating cost required for preparing a uniform electrode or eliminates the formation step.

[0054] The material of the negative collector layer 3 and the extended negative collector 4 can be selected from existing conductive materials, and the negative electrode body 2 and the extended negative collector 4 can be electrically connected through internal or external design of the battery.

[0055] As can be seen, the secondary battery of the embodiment provides a transfer electrode, which makes the positive electrode 1 and the negative electrode body 2 contact with the electrolyte 5, and the positive electrode 1 and the extended negative collector 4 (the extended negative collector 4 is electrically connected to the negative electrode body 2 through the negative collector layer 3) are arranged at intervals, and the distance between the positive electrode 1 and the negative electrode body 2 is greater than the distance between the positive electrode 1 and the extended negative collector 4. In this way, during the charging process of the battery, due to the effect of the applied voltage, the field strength distribution is the largest in the gap between the positive electrode 1 and the extended negative collector 4, and the positive and negative charges are gathered here. At this time, the metal ions preferentially get electrons on the extended negative collector 4 near the positive electrode 1 and are reduced to metal electrodes. By enriching the negative electrode active material in the area where the negative electrode body 2 is located, after the discharging process, the negative electrode active material is preferentially deposited on the extended negative collector 4 which is not easy to grow dendrites and corresponds to the larger area of the positive electrode by using the change of the electric field strength, thereby completing the process of transferring the negative electrode active material from the negative electrode body 2 to the extended negative collector 4. The structural design of the present application can inhibit the growth of metal dendrites between the positive electrode 1 and the negative electrode body 2, and improve the charging efficiency, thereby increasing the charge and discharge times of the flexible battery without changing the electrode and electrolyte 5 formula, and prolonging the cycle life of the battery.

[0056] Optionally, referring to Figure 2 The secondary battery of the transfer electrode further comprises a separation layer 9 arranged between the positive electrode 1 and the extended negative collector 4.

[0057] The isolation layer 9 can be a porous diaphragm with strong liquid absorption and wetting capacity. The isolation layer 9 can not only separate the positive electrode 1 and the extended negative current collector 4, but also hinder the growth and penetration of dendrites by using its physical properties. In addition, the isolation layer 9 can improve the wettability of the electrolyte 5 (specifically, the electrolyte) to the overall electrode and improve the ion transmission efficiency.

[0058] Optionally, the isolation layer 9 can be a flexible diaphragm cut into shape, or a printed or coated porous insulating layer, or formed by the superposition of a flexible diaphragm and a printed porous layer. The isolation layer 9 can only contact or cover the extended negative current collector 4, or can simultaneously contact or cover the positive electrode body 2; wherein the coverage here can be partial coverage or complete coverage.

[0059] When the isolation layer 9 simultaneously contacts the positive electrode 1 and the negative electrode body 2, the semi-permeability and liquid absorption and wetting capacity of the isolation layer 9 can be used to make the electrolyte 5 uniformly distributed on the surfaces of the positive electrode 1 and the negative electrode body 2, so that the positive electrode 1 and the negative electrode body 2 can fully contact and react with the electrolyte 5, further improving the rate performance of the flexible battery.

[0060] Optionally, referring to Figure 3 , one side of the isolation layer 9 is opposite to the positive electrode 1, and the other side of the isolation layer 9 is opposite to the negative electrode body 2.

[0061] In this embodiment, the isolation layer 9 separates the positive electrode 1 and the negative electrode body 2, so as to further inhibit the formation of lateral metal dendrites between the positive electrode 1 and the negative electrode body 2.

[0062] Optionally, referring to Figure 2 and Figure 3 , the secondary battery of the transfer electrode includes a first flexible substrate 6, and the negative current collector layer 3 and the extended negative current collector 4 are both arranged on the first flexible substrate 6.

[0063] By arranging the first flexible substrate 6, the negative current collector layer 3 and the extended negative current collector 4 can not only be formed in a flexible manner, but also be printed or coated on the first flexible substrate 6. Optionally, referring to Figures 4 to 7 , the secondary battery of the transfer electrode includes an insulating frame 8, a first flexible substrate 6 and a second flexible substrate 7; wherein:

[0064] The insulating frame 8 encloses the positive electrode 1, the negative electrode body 2 and the electrolyte 5, the first flexible substrate 6 is arranged on one side end surface of the insulating frame 8, and the second flexible substrate 7 is used to cover the other side end surface of the insulating frame 8;

[0065] As shown in Figure 4 and Figure 5 , the negative current collector layer 3 and the extended negative current collector 4 can be arranged on different flexible substrates and electrically connected by direct contact.

[0066] In particular, referring to Figure 6 and Figure 7 , when the negative electrode layer 3 is arranged on the first flexible substrate 6 and the extended negative electrode 4 is arranged on the second flexible substrate 7, the contact part of the negative electrode layer 3 and the extended negative electrode 4 can be located within the enclosed range of the insulating frame 8.

[0067] Optionally, referring to Figure 8 and Figure 9 , the secondary battery of the transfer electrode comprises an insulating frame 8, a first flexible substrate 6 and a second flexible substrate 7; wherein:

[0068] The insulating frame 8 encloses the positive electrode 1, the negative electrode body 2 and the electrolyte 5, the first flexible substrate 6 covers one side end surface of the insulating frame 8, and the second flexible substrate 7 is used to cover the other side end surface of the insulating frame 8;

[0069] The negative electrode layer 3 is arranged on the first flexible substrate 6, and the extended negative electrode 4 is arranged on the second flexible substrate 7, the negative electrode layer 3 is used to contact the extended negative electrode 4, and the contact part of the negative electrode layer 3 and the extended negative electrode 4 is located outside the enclosed range of the insulating frame 8.

[0070] The insulating frame 8 can be an insulating plastic frame, or can be formed by heat sealing of the first flexible substrate 6 and the second flexible substrate 7; the first flexible substrate 6 and the second flexible substrate 7 can be directly clamped on the upper and lower two side end surfaces of the insulating frame 8, and the positive electrode 1, the negative electrode body 2 and the electrolyte 5 are all located within the enclosed range of the insulating frame 8 to achieve packaging. The negative electrode layer 3 and the extended negative electrode 4 can be formed in a flexible manner, or can be printed or coated on the first flexible substrate 6 and / or the second flexible substrate 7.

[0071] As shown in Figure 6 and Figure 7 , the negative electrode layer 3 and the extended negative electrode 4 can be electrically connected within the area enclosed by the insulating frame 8, wherein, Figure 7 The left and right views in the figure are respectively two-directional cross-sectional schematic views of the insulating frame 8 after being cut with a cutting plane parallel to the first flexible substrate 6 and the second flexible substrate 7.

[0072] In another embodiment, as shown in Figure 8 and Figure 9 , the negative electrode layer 3 and the extended negative electrode 4 can be electrically connected outside the packaging structure formed by the insulating frame 8, the first flexible substrate 6 and the second flexible substrate 7. In this way, the flexibility of the flexible battery structure layout can be improved. Wherein, Figure 9 The left and right views in the figure are respectively two-directional cross-sectional schematic views of the insulating frame 8 after being cut with a cutting plane parallel to the first flexible substrate 6 and the second flexible substrate 7.

[0073] Optionally, referring to Figure 10 and Figure 11 , the first flexible substrate 6 is used to be folded, and the part of the first flexible substrate 6 covering the other side end surface of the insulating frame 8 after folding constitutes the second flexible substrate 7.

[0074] The embodiment provides a folding manner of the flexible substrate to realize packaging. Specifically, as shown in Figure 10 , the lower side end surface of the insulating frame 8 is attached to the upper side of the first flexible substrate 6, the positive electrode 1, the negative electrode body 2, the negative current collector layer 3 and the electrolyte 5 can be located within the enclosed range of the insulating frame 8, the extended negative current collector 4 can be arranged on the upper side of the first flexible substrate 6 and located outside the enclosed range of the insulating frame 8, the folding line can be arranged on the first flexible substrate 6, and the folding line is located between the insulating frame 8 and the extended negative current collector 4.

[0075] The first flexible substrate 6 can be folded through the folding line to electrically connect the extended negative current collector 4 and the negative current collector layer 3 after folding, and to arrange the extended negative current collector 4 and the positive electrode 1 apart after folding. As shown in Figure 11 , at this time, the part of the first flexible substrate 6 attached to the upper side end surface of the insulating frame 8 (i.e. the part where the negative current collector layer 3 and the extended negative current collector 4 are arranged) constitutes the second flexible substrate 7.

[0076] In the specific implementation process, the negative current collector layer 3 can also be arranged outside the enclosed range of the insulating frame 8 and electrically connected with the extended negative current collector 4 before the folding operation; after the folding operation, the negative current collector layer 3 is electrically connected with the negative electrode body 2, and the extended negative current collector 4 is arranged apart from the positive electrode 1.

[0077] Through the above folding packaging manner, the structural layout flexibility and use convenience of the flexible battery can be improved.

[0078] Optionally, referring to Figure 12 and Figure 13 , the negative electrode body 2 is multiple, and the negative current collector layer 3 is multiple, the multiple negative electrode bodies 2 are electrically connected with the multiple negative current collector layers 3, and the multiple negative current collector layers 3 are used to be electrically connected with the extended negative current collector 4.

[0079] In the embodiment, the multiple negative electrode bodies 2 can be distributed apart on the first flexible substrate 6; in the scheme that the isolation layer 9 contacts the negative electrode body 2, the multiple negative electrode bodies 2 can also be distributed on the upper and lower side surfaces of the isolation layer 9. In this way, while improving the structural layout flexibility of the flexible battery, the negative electrode body 2 and the electrolyte 5 can fully react by increasing the contact area of the negative electrode body 2 and the electrolyte 5, further improving the rate performance of the flexible battery.

[0080] Optionally, the negative electrode body 2 is a metal piece; or the negative electrode body 2 and the negative current collector layer 3 are integrally formed as a metal piece.

[0081] The negative electrode body 2 can directly adopt a metal piece (such as a metal sheet, a metal strip, etc.), and the metal piece can also achieve the effect of electrochemically reacting with the electrolyte 5 and generating electric energy. The metal piece can simultaneously serve as the negative current collector layer 3 due to its good electrical conductivity, but when the metal piece is relatively thin, the metal piece is preferably attached to the negative current collector layer 3.

[0082] Correspondingly, the present application also provides a power-consuming device, which comprises the secondary battery with the transfer electrode according to any one of the above embodiments.

[0083] In the present embodiment, the power-consuming device can be any wearable device, terminal device, etc. that can be powered by the flexible battery. The above secondary battery with the transfer electrode can be made into a wound core or a stacked core, and is connected to an input end of the power-consuming device to transmit the generated electric energy to the power-consuming device, thereby powering the power-consuming device. The specific structure of the secondary battery with the transfer electrode can refer to the above embodiments. Since the power-consuming device adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0084] It should be noted that other contents of the secondary battery with the transfer electrode and the power-consuming device disclosed in the present application can refer to the prior art, which will not be repeated here.

[0085] The above is only an optional embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made under the concept of the present application, or direct / indirect application in other related technical fields by using the content of the present application specification and drawings is included in the patent protection scope of the present application.

Claims

1. A secondary battery with a transfer electrode, characterized in that, The secondary cell of the transfer electrode includes a positive electrode, a negative electrode body, a negative current collector layer, an extended negative current collector, and an electrolyte; wherein: The positive electrode, the negative electrode body, and the electrolyte are in contact. The positive electrode, the negative electrode body, and the extended negative current collector are spaced apart. The extended negative current collector is disposed above the positive electrode. The distance between the positive electrode and the negative electrode body is greater than the distance between the positive electrode and the extended negative current collector. The negative electrode body is electrically connected to the negative current collector layer. The negative current collector layer is used to electrically connect to the extended negative current collector. The negative electrode body is a metal component. During the charging process, the electric field strength distribution is maximized at the gap between the positive electrode and the negative collector electrode layer under the action of the applied voltage, causing positive and negative charges to accumulate. Metal ions preferentially gain electrons on the extended negative collector electrode near the positive electrode and are reduced to metal electrodes, thereby completing the process of the negative electrode transferring from the negative electrode body to the extended negative collector electrode, thus suppressing the growth of metal dendrites between the positive electrode and the negative electrode body.

2. The secondary battery with a transfer electrode according to claim 1, characterized in that, The secondary cell of the transfer electrode also includes an isolation layer, which is disposed between the positive electrode and the extended negative collector electrode.

3. The secondary battery with a transfer electrode according to claim 2, characterized in that, The insulating layer covers the negative electrode body; And / or, the isolation layer is a flexible membrane and / or a porous layer.

4. The secondary battery with a transfer electrode according to claim 1, characterized in that, There are multiple negative electrode bodies and multiple negative collector layers. The multiple negative electrode bodies are electrically connected to the multiple negative collector layers, and the multiple negative collector layers are used to be electrically connected to the extended negative collector.

5. The secondary battery with a transfer electrode according to claim 1, characterized in that, The secondary cell of the transfer electrode includes a first flexible substrate, and the negative current collector layer and the extended negative current collector are both disposed on the first flexible substrate.

6. The secondary battery with the transfer electrode according to claim 1, characterized in that, The secondary cell of the transfer electrode includes an insulating frame, a first flexible substrate, and a second flexible substrate; wherein: The insulating frame encloses the positive electrode, the negative electrode, and the electrolyte. The first flexible substrate covers one end face of the insulating frame, and the second flexible substrate covers the other end face of the insulating frame. The negative collector layer is disposed on the first flexible substrate, and the extended negative collector is disposed on the second flexible substrate. The negative collector layer is used to contact the extended negative collector, and the contact portion between the negative collector layer and the extended negative collector is located within the enclosure of the insulating frame.

7. The secondary battery with a transfer electrode according to claim 1, characterized in that, The secondary cell of the transfer electrode includes an insulating frame, a first flexible substrate, and a second flexible substrate; wherein: The insulating frame encloses the positive electrode, the negative electrode, and the electrolyte. The first flexible substrate covers one end face of the insulating frame, and the second flexible substrate covers the other end face of the insulating frame. The negative collector layer is disposed on the first flexible substrate, and the extended negative collector is disposed on the second flexible substrate. The negative collector layer is used to contact the extended negative collector, and the contact portion between the negative collector layer and the extended negative collector is located outside the enclosure of the insulating frame.

8. The secondary battery with the transfer electrode according to claim 7, characterized in that, The first flexible substrate is used for folding, and the portion of the first flexible substrate that covers the other end face of the insulating frame after folding constitutes the second flexible substrate.

9. An electrical device, characterized in that, The electrical device includes a secondary battery with a transfer electrode as described in any one of claims 1 to 8.

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