A staggered electrode battery cell, wound battery and laminated battery

Abstract

The present invention discloses a staggered electrode cell, a wound battery, and a laminated battery. The staggered electrode cell includes a flexible diaphragm, a positive electrode body, a negative electrode body, an extended negative collector, and an electrolyte. The flexible diaphragm is located in the electrolyte, the positive electrode body is disposed on one side of the flexible diaphragm and contacts the electrolyte, the negative electrode body and the extended negative collector are disposed on the other side of the flexible diaphragm, the negative electrode body and the extended negative collector contact the electrolyte, the negative electrode body and the extended negative collector are electrically connected, and the distance between the positive electrode body and the negative electrode body is greater than the distance between the positive electrode body and the extended negative collector. The staggered electrode cell disclosed in the present invention can solve the technical problem that existing flexible batteries are prone to forming metal dendrites during the charge and discharge process, thereby causing faults such as short circuits, seriously reducing the battery's service life, and posing safety hazards.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and in particular relates to a staggered electrode battery cell, a wound battery and a laminated battery. Background Art

[0002] With the development of the Internet of Things and flexible electronics, flexible batteries are gaining increasing attention due to their simple production process and flexible application scenarios. The development of low-power chips has led to the use of flexible batteries, which have lower capacity than power batteries but are lighter and more flexible, allowing for more flexible electrode design.

[0003] However, during the charge and discharge process of flexible batteries, metal dendrites easily form between the positive and negative electrodes. The accumulation of metal dendrites can cause short circuits, leading to battery failure, severely reducing the battery life and even causing safety accidents. Therefore, optimizing the structure of low-capacity flexible batteries can increase the number of charge and discharge cycles of flexible batteries without increasing equipment and process costs. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a staggered electrode battery cell, which aims to solve the technical problem that existing flexible batteries are prone to form metal dendrites during the charging and discharging process, thereby causing faults such as short circuits, seriously reducing the service life of the battery and posing safety hazards.

[0005] In order to achieve the purpose, the present invention adopts the following technical solutions:

[0006] A staggered electrode battery cell, comprising a flexible diaphragm, a positive electrode body, a negative electrode body, an extended negative collector, and an electrolyte; wherein:

[0007] The flexible diaphragm is located in the electrolyte, the positive electrode body is arranged on one side of the flexible diaphragm and is in contact with the electrolyte, the negative electrode body and the extended negative collector are arranged on the other side of the flexible diaphragm, the negative electrode body and the extended negative collector are in contact with the electrolyte, the negative electrode body is electrically connected to the extended negative collector, and the distance between the positive electrode body and the negative electrode body is greater than the distance between the positive electrode body and the extended negative collector.

[0008] Furthermore, the positive electrode body is coated or printed on one side of the flexible separator.

[0009] Furthermore, the negative electrode body is coated or printed on the other side of the flexible separator.

[0010] Furthermore, the extended negative collector is coated or printed on the other side of the flexible diaphragm.

[0011] Furthermore, the negative electrode body is an integrally formed metal part.

[0012] Furthermore, the positive electrode body includes a plurality of positive electrode layers and a plurality of positive collector bodies, the plurality of positive collector bodies are coated on the plurality of positive electrode layers in a one-to-one correspondence, and the plurality of positive collector bodies extend to one side surface of the flexible diaphragm.

[0013] Furthermore, the negative electrode body includes multiple negative electrode layers and multiple negative collector bodies, and the multiple negative collector bodies are coated on the multiple negative electrode layers one by one; there is at least one extended negative collector, and at least one extended negative collector is electrically connected to two adjacent negative collector bodies.

[0014] Furthermore, the negative electrode layer is respectively arranged on a side of the negative collector body facing the flexible diaphragm and a side of the negative collector body facing away from the flexible diaphragm.

[0015] Furthermore, the positive electrode layer is respectively provided on a side of the positive collector body facing the flexible diaphragm and a side of the positive collector body facing away from the flexible diaphragm.

[0016] Furthermore, the negative electrode body and the extended negative collector are spaced apart, and the negative electrode body is connected to the extended negative collector via an electrode terminal.

[0017] Furthermore, there are two or more flexible membranes; the positive electrode body is arranged on both sides of any flexible membrane, and the negative electrode body and the extended negative collector are arranged on the side of another adjacent flexible membrane facing away from the positive electrode body.

[0018] Furthermore, the negative electrode body and the extended negative collector are arranged on both sides of any one of the flexible diaphragms, and the positive electrode body is arranged on a side of another adjacent flexible diaphragm facing away from the negative electrode body.

[0019] Furthermore, the staggered electrode cell further comprises a dense substrate, and the dense substrate is any one of an insulating flexible substrate and a conductive substrate;

[0020] The negative electrode body and the extended negative collector are arranged on the dense substrate;

[0021] And / or, the positive electrode body is disposed on the dense substrate.

[0022] Correspondingly, the present invention also provides a wound battery, which includes the aforementioned staggered electrode cell.

[0023] Correspondingly, the present invention also provides a laminated battery, which includes the aforementioned staggered electrode cell.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The staggered electrode battery cell proposed in the present invention allows the flexible diaphragm, positive electrode body, and negative electrode body to contact the electrolyte, and the positive electrode body is arranged on one side of the flexible diaphragm, and the negative electrode body and the extended negative collector are electrically connected and arranged on the other side of the flexible diaphragm, so that the distance between the positive electrode body and the negative electrode body is greater than the distance between the positive electrode body and the extended negative collector. In this way, during the battery charging process, due to the action of the external voltage, the field strength distribution at the gap between the positive electrode body and the extended negative collector is the largest, and positive and negative charges gather here. At this time, metal ions preferentially obtain electrons on the extended negative collector near the positive electrode body and are reduced to metal electrodes, that is, the process of transferring the negative electrode from the negative electrode body to the extended negative collector is completed, which can inhibit the growth of metal dendrites between the positive electrode body and the negative electrode body, reduce the risk of battery short circuit, eliminate safety hazards, and increase the number of charge and discharge times of the flexible battery without changing the electrode and electrolyte formula, thereby extending the cycle life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0027] Figure 1 Schematic diagram of the cross-sectional structure of the first embodiment of the staggered electrode battery cell of the present invention;

[0028] Figure 2 Schematic diagram of the cross-sectional structure of the second embodiment of the staggered electrode battery cell of the present invention;

[0029] Figure 3 Schematic diagram of the cross-sectional structure of the third embodiment of the staggered electrode battery cell of the present invention;

[0030] Figure 4 Schematic diagram of the cross-sectional structure of a fourth embodiment of a staggered electrode battery cell according to the present invention;

[0031] Figure 5 Schematic diagram of the cross-sectional structure of the fifth embodiment of the staggered electrode battery cell of the present invention;

[0032] Figure 6 Schematic diagram of the cross-sectional structure of a sixth embodiment of a staggered electrode battery cell according to the present invention;

[0033] Figure 7 Schematic diagram of the cross-sectional structure of the seventh embodiment of the staggered electrode battery cell of the present invention;

[0034] Figure 8 Schematic diagram of the cross-sectional structure of the eighth embodiment of the staggered electrode battery cell of the present invention;

[0035] Figure 9 Schematic diagram of the cross-sectional structure of a ninth embodiment of a staggered electrode battery cell according to the present invention;

[0036] Figure 10 Schematic diagram of the cross-sectional structure of the tenth embodiment of the staggered electrode battery cell of the present invention;

[0037] Figure 11 Schematic diagram of the cross-sectional structure of the eleventh embodiment of the staggered electrode battery cell of the present invention.

[0038] Description of Figure Numbers:

[0039] Label name Label name 1 Flexible diaphragm 21 Positive electrode layer 2 Positive electrode body 22 Positive collector 3 Negative electrode body 31 Negative electrode layer 4 Expanded negative collector 32 Negative collector 5 dense base

[0040] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] 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 position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] Reference Figure 1 and Figure 2 The embodiment of the present invention provides a staggered electrode battery cell, which includes a flexible diaphragm 1, a positive electrode body 2, a negative electrode body 3, an extended negative collector 4 and an electrolyte; wherein:

[0045] The flexible diaphragm 1 is located in the electrolyte, the positive electrode body 2 is arranged on one side of the flexible diaphragm 1 and in contact with the electrolyte, the negative electrode body 3 and the extended negative collector 4 are arranged on the other side of the flexible diaphragm 1, the negative electrode body 3 and the extended negative collector 4 are in contact with the electrolyte, the negative electrode body 3 and the extended negative collector 4 are electrically connected, and the distance between the positive electrode body 2 and the negative electrode body 3 is greater than the distance between the positive electrode body 2 and the extended negative collector 4.

[0046] In this embodiment, the electrolyte can be a gel or liquid electrolyte that reacts with the electrodes to generate electricity. The electrolyte can be used to conduct ions and provide electrical isolation. The electrolyte can be laid on a flexible substrate and enclosed by a stopper to achieve packaging.

[0047] The surface of the positive electrode body 2 and the negative electrode body 3 can be covered with an active material layer that can undergo an electrochemical reaction with the electrolyte (such as nickel oxide and silver oxide that can react with alkaline electrolyte in alkaline batteries. In addition, it can also be other active substances that can react with the corresponding electrolyte in lithium batteries and zinc batteries. For details, please refer to the existing technology and will not be described here). The active material layer reacts with the electrolyte to generate electrical energy and can be transmitted to the electrical appliance to achieve the function of powering the electrical appliance. In addition, the negative electrode body 3 can also directly use metal parts (such as metal sheets, metal strips, etc.). The metal parts can also achieve the effect of undergoing an electrochemical reaction with the electrolyte and generating electrical energy. Due to its own good conductivity, the metal parts can also serve as collectors. However, when the metal parts are thin, the metal parts are preferably attached to the collectors.

[0048] Research has found that during charging, metal dendrites are easily formed in the gap between the positive and negative electrode bodies 2 and 3, as the electric field intensity is highest in the gap between the positive and negative electrode bodies 2 and 3, and the metal deposition area is relatively small. This can cause battery failures such as short circuits. For a flexible sandwich structure, the extended negative collector 4 on the positive electrode body 2 must be evenly covered with active material. However, when the extended negative collector 4 is a porous structure such as carbon cloth or carbon paper, the coating of active material is not as uniform as with electrodes prepared by electroplating. As a result, more active material remains on the porous structure, unresponsive to the reaction.

[0049] Based on the above problems, this embodiment uses a flexible diaphragm 1 to separate the positive electrode body 2 from the negative electrode body 3. The negative collector 4 can be formed in a flexible manner or printed or coated on the flexible diaphragm 1. In this way, when the positive electrode body 2 and the negative electrode body 3 are on both sides of the flexible diaphragm 1, Figure 1 When the staggered arrangement is shown, the shortest straight-line distance between the positive electrode body 2 and the negative electrode body 3 must be greater than the shortest straight-line distance between the positive electrode body 2 and the extended negative collector 4 . Based on the above configuration, during the discharge process of the flexible battery, since the charge is extracted to the external current, the charge movement speed is much greater than the movement speed of the ions in the electrolyte, and the electric field can be regarded as uniformly distributed between the positive electrode body 2 and the negative electrode body 3. At this time, the metal on the negative electrode body 3 continues to oxidize to form metal ions and release them into the electrolyte; and during the charging process of the flexible battery, due to the action of the applied voltage, the field strength distribution is the largest at the position where the positive electrode body 2 and the negative electrode body 3 are close to each other (that is, the gap between the positive electrode body 2 and the extended negative collector 4), and positive and negative charges gather here. At this time, the metal ions preferentially obtain electrons on the extended negative collector 4 near the positive electrode body 2 and are reduced to metal electrodes, that is, the process of the negative electrode transferring from the negative electrode body 3 to the extended negative collector 4 is completed, which can inhibit the growth of metal dendrites between the positive electrode body 2 and the negative electrode body 3, reduce the risk of battery short circuit, eliminate safety hazards, and increase the number of charge and discharge times of the flexible battery without changing the electrode and electrolyte formula, thereby extending the cycle life of the battery.

[0050] The flexible diaphragm 1 can be made of a porous diaphragm with strong liquid absorption and wetting ability. In this way, the semi-permeability and liquid absorption and wetting ability of the flexible diaphragm 1 can be used to prevent larger molecules from passing through and only allow smaller charged ions to pass through, so that the electrolyte (specifically an electrolyte) can pass through the flexible diaphragm 1 and quickly diffuse on the surface of the positive electrode body 2 and the negative electrode body 3, so that the electrolyte is evenly distributed on the positive electrode body 2 and the negative electrode body 3, so that the positive electrode body 2 and the negative electrode body 3 can fully contact and react with the electrolyte, thereby improving the rate performance of the flexible battery.

[0051] The extended negative collector 4 can be a conductive metal member or a structure formed by coating a collector layer on both sides of a substrate. Preferably, a porous structure (such as a conductive fiber structure such as carbon cloth or carbon paper) can be provided on the extended negative collector 4. Furthermore, uniform nucleation sites can be formed by, for example, adding a small amount of active material, plasma treatment, or hydrophilic / hydrophobic coating. This allows the metal electrodes formed by the reduction of metal ions with electrons to be more evenly distributed on the extended negative collector 4, thereby reducing non-uniform metal deposition and further inhibiting the formation of metal dendrites.

[0052] It should be noted that the electrical connection between the negative electrode body 3 and the extended negative collector 4 can be direct contact between the two, or electrical connection can be achieved through the use of a conductive medium.

[0053] It can be seen that the staggered electrode cell provided in this embodiment allows the flexible diaphragm 1, the positive electrode body 2, and the negative electrode body 3 to contact the electrolyte, and the positive electrode body 2 is arranged on one side of the flexible diaphragm 1, and the negative electrode body 3 and the extended negative collector 4 are electrically connected and arranged on the other side of the flexible diaphragm 1, so that the distance between the positive electrode body 2 and the negative electrode body 3 is greater than the distance between the positive electrode body 2 and the extended negative collector 4. In this way, during the battery charging process, due to the action of the applied voltage, the field strength distribution is the largest at the gap between the positive electrode body 2 and the extended negative collector 4, and positive and negative charges gather here. At this time, the metal ions preferentially obtain electrons on the extended negative collector 4 near the positive electrode body 2 and are reduced to metal electrodes, that is, the process of the negative electrode transferring from the negative electrode body 3 to the extended negative collector 4 is completed, which can inhibit the growth of metal dendrites between the positive electrode body 2 and the negative electrode body 3, reduce the risk of battery short circuit, eliminate safety hazards, and increase the number of charge and discharge times of the flexible battery without changing the electrode and electrolyte formula, thereby extending the cycle life of the battery.

[0054] Alternatively, the positive electrode body 2 is coated or printed on one side of the flexible separator 1 .

[0055] Optionally, the negative electrode body 3 is coated or printed on the other side of the flexible separator 1 .

[0056] Optionally, the extended negative collector 4 is coated or printed on the other side of the flexible membrane 1 .

[0057] In the above embodiment, the positive electrode body 2, the negative electrode body 3 and the extended negative collector 4 are arranged on the flexible diaphragm 1 by coating to form a multi-layer structure, so that the staggered electrode battery cell can be used in a wound battery or a laminated battery to meet the power demand of a larger capacity.

[0058] Optionally, refer to Figures 1 to 3The positive electrode body 2 includes multiple positive electrode layers 21 and multiple positive collector bodies 22 . The multiple positive collector bodies 22 are coated on the multiple positive electrode layers 21 in a one-to-one correspondence, and the multiple positive collector bodies 22 extend to one side of the flexible diaphragm 1 .

[0059] Optionally, refer to Figures 1 to 3 The negative electrode body 3 includes multiple negative electrode layers 31 and multiple negative collector bodies 32, and the multiple negative collector bodies 32 are coated on the multiple negative electrode layers 31 one by one; there is at least one extended negative collector 4, and at least one extended negative collector 4 is electrically connected to two adjacent negative collector bodies 32.

[0060] When both the positive electrode layer 21 and the positive collector body 22 are provided in multiple layers, the contact area between the positive electrode body 2 and the electrolyte can be increased, allowing the positive electrode body 2 and the electrolyte to fully react, thereby further improving the rate performance of the flexible battery. Similarly, when both the negative electrode layer 31 and the negative collector body 32 are provided in multiple layers, the contact area between the negative electrode body 3 and the electrolyte can be increased, allowing the negative electrode body 3 and the electrolyte to fully react, thereby further improving the rate performance of the flexible battery.

[0061] In which, when the positive electrode layer 21 and the positive collector body 22 are both set to multiple and / or the negative electrode layer 31 and the negative collector body 32 are both set to multiple, the distance from each positive electrode layer 21 to the corresponding negative electrode layer 31 is greater than the distance from the positive electrode layer 21 to the corresponding extended negative collector 4.

[0062] Optionally, the negative electrode body 3 is an integrally formed metal part.

[0063] Negative electrode body 3 can be directly made of a metal member (such as a metal sheet or metal strip), which can also achieve the effect of generating electrical energy by electrochemically reacting with the electrolyte. Due to its good conductivity, the metal member can also serve as negative collector body 32. However, when the metal member is relatively thin, it is preferably attached to the extended negative collector 4.

[0064] Optionally, refer to Figure 4 and Figure 5 The negative electrode layer 31 is respectively arranged on the side of the negative collector body 32 facing the flexible separator 1 and the side of the negative collector body 32 facing away from the flexible separator 1 .

[0065] Optionally, refer to Figure 4 and Figure 5 The positive electrode layer 21 is respectively provided on one side of the positive collector body 22 facing the flexible separator 1 and the other side of the positive collector body 22 facing away from the flexible separator 1 .

[0066] Illustratively, this embodiment can improve the flexibility of the electrical connection between the negative electrode layer 31 and the negative collector body 32, and the positive electrode layer 21 and the positive collector body 22, and can increase the contact area between the negative electrode body 3, the positive electrode body 2 and the electrolyte, so that the negative electrode body 3, the positive electrode body 2 can fully react with the electrolyte, thereby further improving the rate performance of the flexible battery.

[0067] Optionally, refer to Figure 1 The negative electrode body 3 and the extended negative collector 4 are spaced apart, and the negative electrode body 3 is connected to the extended negative collector 4 through an electrode terminal.

[0068] In this embodiment, the negative electrode body 3 and the extended negative collector 4 can be electrically connected through electrode terminals inside or outside the packaging structure formed by the flexible substrate and the limiter, which can improve the flexibility of the staggered electrode cell structure layout.

[0069] Optionally, refer to Figures 6 to 8 There are two or more flexible diaphragms 1; the positive electrode body 2 is arranged on both sides of any flexible diaphragm 1, and the negative electrode body 3 and the extended negative collector 4 are arranged on the side of another adjacent flexible diaphragm 1 facing away from the positive electrode body 2.

[0070] Optionally, refer to Figures 6 to 8 The negative electrode body 3 and the extended negative collector 4 are arranged on both sides of any flexible diaphragm 1 , and the positive electrode body 2 is arranged on the side of another adjacent flexible diaphragm 1 facing away from the negative electrode body 3 .

[0071] When the flexible diaphragm 1 is provided in multiple configurations, the configuration of the positive electrode body 2, the negative electrode body 3, and the extended negative collector 4 relative to the flexible diaphragm 1 can refer to Figures 6 to 8 , specifically, Figure 6 As shown, the positive electrode body 2 (specifically, the positive electrode layer 21 and the positive collector body 22) and the negative electrode body 3 (specifically, the negative electrode layer 31 and the negative collector body 32) can be coated on two flexible separators 1 respectively; Figure 7 As shown, a pair of negative electrode bodies 3 (specifically, negative electrode layers 31) and an extended negative collector 4 can be integrated on the same flexible diaphragm 1; Figure 8 As shown, a pair of positive electrode bodies 2 (specifically, a positive electrode layer 21 and a positive collector body 22) can be integrated on the same flexible diaphragm 1. This can achieve a multi-layer structure of the staggered electrode cell and improve the flexibility of the structural layout.

[0072] Optionally, refer to Figures 9 to 11 , the staggered electrode cell further includes a dense substrate 5, which is any one of an insulating flexible substrate and a conductive substrate;

[0073] The negative electrode body 3 and the extended negative collector 4 are arranged on a dense substrate 5;

[0074] And / or, the positive electrode body 2 is disposed on a dense substrate 5 .

[0075] The dense substrate 5 can be an insulating flexible substrate or a conductive substrate (such as a metal foil or a conductive polymer). When the dense substrate 5 is a conductive substrate, the dense substrate 5 can be electrically connected to the negative electrode body 3 as a collector, thereby eliminating the need to extend the negative collector 4. Illustratively, the positive electrode body 2 and the negative electrode body 3 can be respectively arranged on the dense substrate 5 and the flexible separator 1 (such as Figure 9 and Figure 11 As shown), the positive electrode body 2 and the negative electrode body 3 can also be respectively placed on two dense substrates 5 and separated by a flexible diaphragm 1 (as shown Figure 10 As shown, this arrangement can facilitate the use of the staggered electrode battery cell in a wound battery or a laminated battery).

[0076] Figure 11 A special case when the dense substrate 5 is provided is shown. Specifically, when the dense substrate 5 is a conductive substrate, the negative electrode bodies 3 (specifically, the negative electrode layers 31 ) can be symmetrically provided on both sides of the conductive substrate.

[0077] Correspondingly, an embodiment of the present invention further provides a wound battery, which includes the staggered electrode cell in any of the above embodiments.

[0078] In this embodiment, the wound battery is composed of cells assembled in a wound manner, which may include multiple of the aforementioned staggered electrode cells and other supporting components. For the specific structure of the staggered electrode cells, please refer to the above embodiments. Since this wound battery utilizes all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be detailed here.

[0079] Correspondingly, an embodiment of the present invention further provides a stacked battery, which includes the staggered electrode cell in any of the above embodiments.

[0080] In this embodiment, the laminated battery is a standalone battery formed by stacking and connecting multiple cells in series. It may include multiple cells with staggered electrodes as described above, as well as other supporting components. For the specific structure of the staggered electrode cells, please refer to the above embodiments. Since this laminated battery utilizes all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated on here.

[0081] It should be noted that other contents of the staggered electrode battery cell, wound battery and laminated battery disclosed in the present invention can be found in the prior art and will not be described in detail here.

[0082] The above are only optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A staggered electrode battery cell, characterized in that: The staggered electrode cell comprises a flexible diaphragm, a positive electrode body, a negative electrode body, an extended negative collector and an electrolyte; wherein: The flexible diaphragm is located in the electrolyte, the positive electrode body is arranged on one side of the flexible diaphragm and contacts the electrolyte, the negative electrode body and the extended negative collector are arranged on the other side of the flexible diaphragm, the negative electrode body and the extended negative collector contact the electrolyte, the negative electrode body and the extended negative collector are electrically connected, and the distance between the positive electrode body and the negative electrode body is greater than the distance between the positive electrode body and the extended negative collector; During the charging process, the field strength distribution is maximized at the gap between the positive electrode body and the extended negative collector under the action of the external voltage, causing positive and negative charges to gather. Metal ions preferentially obtain electrons on the extended negative collector near the positive electrode body and are reduced to metal electrodes to complete the process of transferring the negative electrode from the negative electrode body to the extended negative collector, thereby inhibiting the growth of metal dendrites between the positive electrode body and the negative electrode body.

2. The staggered electrode battery cell according to claim 1, characterized in that: The positive electrode body is coated or printed on one side of the flexible separator; and / or, the negative electrode body is coated or printed on the other side of the flexible separator; And / or, the extended negative collector is coated or printed on the other side of the flexible diaphragm.

3. The staggered electrode battery cell according to claim 1, characterized in that: The negative electrode body is an integrally formed metal part.

4. The staggered electrode battery cell according to claim 1, characterized in that: The positive electrode body includes a plurality of positive electrode layers and a plurality of positive collector bodies, wherein the plurality of positive collector bodies are coated on the plurality of positive electrode layers in a one-to-one correspondence, and the plurality of positive collector bodies extend to one side surface of the flexible diaphragm; And / or, the negative electrode body includes multiple negative electrode layers and multiple negative collector bodies, and the multiple negative collector bodies are coated on the multiple negative electrode layers one by one; there is at least one extended negative collector, and at least one extended negative collector is electrically connected to two adjacent negative collector bodies.

5. The staggered electrode battery cell according to claim 4, characterized in that: The negative electrode layer is respectively arranged on a side of the negative collector body facing the flexible diaphragm and a side of the negative collector body facing away from the flexible diaphragm; And / or, the positive electrode layer is respectively arranged on a side of the positive collector body facing the flexible diaphragm and a side of the positive collector body facing away from the flexible diaphragm.

6. The staggered electrode battery cell according to claim 1, characterized in that: The negative electrode body is spaced apart from the extended negative collector, and the negative electrode body is connected to the extended negative collector through an electrode terminal.

7. The staggered electrode battery cell according to claim 1, characterized in that: There are two or more flexible diaphragms; the positive electrode body is arranged on both sides of any one of the flexible diaphragms, and the negative electrode body and the extended negative collector are arranged on the side of another adjacent flexible diaphragm facing away from the positive electrode body; And / or, the negative electrode body and the extended negative collector are arranged on both sides of any one of the flexible separators, and the positive electrode body is arranged on a side of another adjacent flexible separator facing away from the negative electrode body.

8. The staggered electrode battery cell according to claim 1, characterized in that: The staggered electrode cell further includes a dense substrate, which is any one of an insulating flexible substrate and a conductive substrate; The negative electrode body and the extended negative collector are arranged on the dense substrate; And / or, the positive electrode body is disposed on the dense substrate.

9. A wound battery, characterized in that: The wound battery comprises the staggered electrode cell according to any one of claims 1 to 8.

10. A stacked battery, characterized in that: The stacked battery comprises the staggered electrode battery cell according to any one of claims 1 to 8.

Images