Symmetric battery cell, battery, method for manufacturing a symmetric battery cell, method for manufacturing a battery

Abstract

The present invention discloses a symmetric battery cell, a battery, a method for manufacturing a symmetric battery cell, and a method for manufacturing a battery, which relate to the technical field of thin-film batteries. Among them, the symmetric battery cell includes an electrode unit, the electrode unit includes a positive electrode and a negative electrode, the positive electrode and the negative electrode are arranged to be axially symmetric or centrosymmetric, and the electrode arms of the positive electrode are meshed with the electrode arms of the negative electrode. The symmetric battery cell can be axially symmetric or centrosymmetric in a structure form where the electrode arms of the positive electrode and the negative electrode are meshed, and two groups of the same positive electrodes or two groups of the same negative electrodes can be divided from one sheet, and then two groups of the above symmetric battery cells can be assembled correspondingly, improving the manufacturing efficiency. The above symmetric battery cell can be used as a unit model for large-scale production achieved through simple coating and die-cutting, which is convenient for avoiding the risk of connection short circuit caused by micro-structured electrodes during the printing process.

Description

Technical Field

[0001] The present invention relates to the technical field of thin-film batteries, and particularly relates to a symmetric battery cell, a battery, a method for manufacturing a symmetric battery cell, and a method for manufacturing a battery. Background Art

[0002] With the rapid expansion of the market space for wearable products, flexible thin-film batteries, as their supporting power supply components, have attracted increasing attention. Distributing the positive and negative of the battery on the same plane has advantages such as customizable shape and easy integration with electrical appliances. However, compared with traditional sandwich-structured batteries, planar batteries increase the ion transport distance, so the internal resistance of the battery is relatively large. Therefore, by miniaturizing the battery electrode pattern, the relative area of the positive and negative electrodes is increased, thereby reducing the ion transport distance of the planar battery and further reducing the internal resistance of the battery. However, in traditional printing processes, due to certain volume requirements for battery active materials and limitations of the screen mesh count, it is difficult to accurately print large-scale micro-structured samples, and the manufacturing efficiency is relatively low. Summary of the Invention

[0003] The main object of the present invention is to propose a symmetric battery cell, aiming to improve the manufacturing efficiency.

[0004] To achieve the above object, the symmetric battery cell proposed by the present invention includes an electrode unit. The electrode unit includes a positive electrode and a negative electrode. The positive electrode and the negative electrode are arranged in axial symmetry or central symmetry, and the pole arms of the positive electrode are engaged with the pole arms of the negative electrode.

[0005] Optionally, the symmetric battery cell includes at least two of the electrode units; the positive electrode includes a first positive pole arm, a positive connection arm, and a second positive pole arm connected in sequence. The first positive pole arm and the second positive pole arm are arranged oppositely; the negative electrode includes a first negative pole arm, a negative connection arm, and a second negative pole arm connected in sequence. The first negative pole arm and the second negative pole arm are arranged oppositely; the first negative pole arm extends between the first positive pole arm and the second positive pole arm, and the first positive pole arm, the first negative pole arm, the second positive pole arm, and the second negative pole arm are arranged in sequence.

[0006] Optionally, both the positive electrode and the negative electrode are provided to include an electrode body layer, a current collector layer, and a separator body layer. The current collector layer is coated on the separator body layer, and the electrode body layer is coated on the current collector layer. The electrode body layer, the current collector layer, and the separator body layer are provided with flush outer contours.

[0007] Optionally, the separator body layer is provided with permeation through-holes, and the current collector layer is provided with a coating permeation structure passing through the permeation through-holes; an electrical connection layer is provided on a side of the separator body layer facing away from the current collector layer, and the electrical connection layer is connected to the coating permeation structure.

[0008] Optionally, the diaphragm body layer is arranged as a porous diaphragm, and the electrical connection layer is obtained by permeating the current collector layer.

[0009] The present invention also provides a battery, including the above-mentioned symmetric battery cell. The battery further includes a first cover plate, a connection frame body, and a second cover plate. One side of the connection frame body is hermetically connected to the first cover plate, and the other side of the connection frame body is hermetically connected to the second cover plate to form an accommodation space for sealing the electrolyte; the accommodation space is used to accommodate the electrolyte, the positive electrode, and the negative electrode.

[0010] The present invention also provides a method for manufacturing a symmetric battery cell for manufacturing the above-mentioned symmetric battery cell. The method for manufacturing the symmetric battery cell includes the following steps: obtaining a positive electrode plate and a negative electrode plate by coating, and both the positive electrode plate and the negative electrode plate are arranged to include an electrode body layer, a current collector layer, and a diaphragm body layer; respectively dividing the positive electrode plate and the negative electrode plate to obtain two groups of the positive electrodes and two groups of the negative electrodes; assembling the positive electrodes and the negative electrodes to form the electrode unit.

[0011] The present invention also provides a method for manufacturing a battery. The method for manufacturing the battery is used to manufacture a battery including the above-mentioned symmetric battery cell. The method for manufacturing the battery includes the following steps: placing the positive electrode and the negative electrode on a transfer substrate and aligning them; setting a conductive adhesive on the electrical connection layer.

[0012] Optionally, the method for manufacturing the battery further includes the following steps: placing the electrical connection layer on a battery substrate, and the battery substrate is provided with pins for electrically connecting with the conductive adhesive.

[0013] Optionally, the method for manufacturing the battery further includes the following steps: forming a battery pack through the symmetric battery cell; dividing the battery pack to obtain battery units.

[0014] The technical solution of the present invention sets the symmetric battery cell to include an electrode unit. The electrode unit includes a positive electrode and a negative electrode. The positive electrode and the negative electrode are arranged to be axially symmetric or centrosymmetric, and the pole arms of the positive electrode and the pole arms of the negative electrode are meshed; the symmetric battery cell can be axially symmetric or centrosymmetric by setting the positive electrode and the negative electrode in a structure form with meshed pole arms, and two groups of the same above-mentioned positive electrodes or two groups of the same above-mentioned negative electrodes can be divided from one plate, and then two groups of the above-mentioned symmetric battery cells can be assembled correspondingly, improving the manufacturing efficiency. The above-mentioned symmetric battery cell can be used as a unit model for large-scale production through simple coating and die-cutting, which is convenient for avoiding the risk of connection short circuit caused by micro-structured electrodes during the printing process. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0016] Figure 1 It is a schematic structural diagram of an embodiment of the symmetric battery cell of the present invention.

[0017] Figure 2 It is a schematic diagram of the assembly process of an embodiment of the symmetric battery cell of the present invention.

[0018] Figure 3 It is a schematic structural diagram of another embodiment of the symmetric battery cell of the present invention.

[0019] Figure 4 It is a schematic cross-sectional view of an embodiment of the symmetric battery cell of the present invention.

[0020] Figure 5 It is a schematic diagram of the production process of an embodiment of the symmetric battery cell of the present invention.

[0021] Figure 6 For Figure 5 an enlarged view of an electrode unit in

[0022] Figure 7 It is a schematic cross-sectional view of another embodiment of the symmetric battery cell of the present invention.

[0023] Figure 8 It is a schematic diagram of the division of an embodiment of the symmetric battery cell of the present invention.

[0024] Figure 9 It is a schematic overall view of an embodiment of the battery of the present invention.

[0025] Explanation of the reference numerals in the drawings:

[0026]

[0027]

[0028] The realization of the objectives, functional features, and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the drawings. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0030] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0031] In addition, if there are descriptions such as "first" and "second" involved 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 implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] The present invention provides a symmetric battery cell, the electrode unit of which satisfies central symmetry or axial symmetry, where Figure 1 an example of a two-dimensional distribution central symmetry electrode structure is given.

[0033] Referring to Figure 1 , in an embodiment of the present invention, the symmetric battery cell includes an electrode unit, the electrode unit includes a positive electrode 1 and a negative electrode 2, the positive electrode 1 and the negative electrode 2 are arranged in axial symmetry or central symmetry, and the pole arms of the positive electrode 1 are engaged with the pole arms of the negative electrode 2. Further, when the positive electrode 1 and the negative electrode 2 are arranged in central symmetry, the positive electrode 1 includes a first positive pole arm 11, a positive connection arm 13, and a second positive pole arm 12 connected in sequence, and the first positive pole arm 11 and the second positive pole arm 12 are arranged oppositely; the negative electrode 2 includes a first negative pole arm 21, a negative connection arm 23, and a second negative pole arm 22 connected in sequence, and the first negative pole arm 21 and the second negative pole arm 22 are arranged oppositely; that is, as Figure 2As shown, after the negative electrode 2 rotates 180 degrees, it will have the same structure as the positive electrode 1. The first negative electrode arm 21 extends between the first positive electrode arm 11 and the second positive electrode arm 12, and the first positive electrode arm 11, the first negative electrode arm 21, the second positive electrode arm 12, and the second negative electrode arm 22 are arranged in sequence. It should be noted that the above-mentioned first positive electrode arm 11, the positive connection arm 13, the second positive electrode arm 12, the first negative electrode arm 21, the negative connection arm 23, and the second negative electrode arm 22 can be set as straight arm-like structures or curved arm-like structures.

[0034] The symmetric battery cell can be axisymmetric or centrosymmetric by setting the positive electrode 1 and the negative electrode 2 in a structure where the electrode arms mesh with each other. It can divide a piece of plate into two sets of the same above-mentioned positive electrodes 1 or two sets of the same above-mentioned negative electrodes 2, and then assemble two sets of the above-mentioned symmetric battery cells correspondingly, improving the manufacturing efficiency. The above-mentioned symmetric battery cell can be used as a unit model for large-scale production achieved through simple coating and die-cutting, which is convenient for avoiding the risk of connection short circuit caused by micro-structured electrodes during the printing process.

[0035] In addition, the symmetric battery cell can improve the area utilization rate of the plane where the conductive layer is located and increase the effective battery capacitance per unit area by arranging the first positive electrode arm 11, the first negative electrode arm 21, the second positive electrode arm 12, and the second negative electrode arm 22 in sequence. Among them, Figure 1 The positive electrode 1 with the shown shape structure is defined as one positive electrode 1, and Figure 1 The negative electrode 2 with the shown shape structure is defined as one negative electrode 2; then a set of positive electrodes 1 can include one positive electrode 1 (refer to Figure 1 ) or multiple positive electrodes 1 (refer to Figure 5 ), and a set of negative electrodes 2 can include one negative electrode 2 (refer to Figure 1 ) or multiple negative electrodes 2 (refer to Figure 5 ); correspondingly, the symmetric battery cell can include one electrode unit (refer to Figure 1 ) or at least two electrode units (refer to Figure 3 ).

[0036] Furthermore, the symmetric battery cell is preferably a centrosymmetric structure, and the centrosymmetric structure is preferably a Peano fractal. Among them, the fractal pattern repeats a single unit multiple times at different scales to form a fractal structure similar to its characteristics. The fractal structure is essentially a simple one-dimensional curve of a unit that repeats continuously until it fills the entire two-dimensional space, finally forming a curved surface-like structure. As Figure 2As shown, the positive electrode 1 and the negative electrode 2 are obtained by repeatedly stacking a U-shaped structure (i.e., the Peano fractal). Among them, the Peano fractal is composed of Peano curves, and its construction process is as follows: Take a square and divide it into 9 equal small squares, then starting from the square in the lower left corner to the square in the upper right corner, connect the centers of the small squares with line segments in sequence; then divide each small square into 9 equal squares, and then connect their centers in the above manner; continue this operation procedure infinitely, and the curve in the final limit situation can fill the entire plane. This is actually a recursive process. Of course, the specific pattern of the fractal structure can be set as needed, and this embodiment does not limit this. Refer to Figure 1 、 Figure 2 , on the side of the first positive electrode arm 11 facing the second positive electrode arm 12, there are the first extension arm 111, the second extension arm 112, and the third extension arm 113 arranged at intervals. The first extension arm 111, the second extension arm 112, and the third extension arm 113 are arranged in sequence in the direction away from the positive connection arm 13; on the side of the first negative electrode arm 21 facing away from the second negative electrode arm 22, there are the first notch 211, the second notch 212, and the third notch 213 arranged at intervals. The first notch 211, the second notch 212, and the third notch 213 are arranged in sequence in the direction towards the negative connection arm 23. The first extension arm 111, the second extension arm 112, and the third extension arm 113 respectively extend into the first notch 211, the second notch 212, and the third notch 213. The positive electrode 1 and the negative electrode 2 are arranged to be centrosymmetric, that is, as Figure 2 shown, on the positive electrode 1, there are corresponding notch structures 211(b), 212(b), 213(b), and on the negative electrode 2, there are corresponding extension arm structures 111(b), 112(b), 113(b).

[0037] On the end of the second extension arm 112 far from the first positive electrode arm 11, there is a fourth extension arm 114, and the fourth extension arm 114 is arranged on the side of the second extension arm 112 facing the positive connection arm 13; at the bottom of the second notch 212, there is a fourth notch 214, and the second notch 212 is arranged on the side of the second notch 212 facing away from the negative connection arm 23; the fourth extension arm 114 extends into the fourth notch 214. The positive electrode 1 and the negative electrode 2 are arranged to be centrosymmetric, that is, as Figure 2 shown, on the positive electrode 1, there is a corresponding notch structure 214(b), and on the negative electrode 2, there is a corresponding extension arm structure 114(b).

[0038] The second positive electrode arm 12 is provided with a fifth extension arm 121 and a sixth extension arm 122 spaced apart on the side facing the first positive electrode arm 11. The fifth extension arm 121 and the sixth extension arm 122 are sequentially arranged in a direction away from the positive connecting arm 13. The first negative electrode arm 21 is provided with a fifth notch 215 and a sixth notch 216 spaced apart on the side facing the second negative electrode arm 22. The fifth notch 215 and the sixth notch 216 are sequentially arranged in a direction toward the negative connecting arm 23. The fifth extension arm 121 and the sixth extension arm 122 extend into the fifth notch 215 and the sixth notch 216, respectively. The positive electrode 1 and the negative electrode 2 are arranged to be centrally symmetrical, that is, as shown in FIG. Figure 2 As shown, the positive electrode 1 is provided with corresponding notch structures 215 ( b ), 216 ( b ), and the negative electrode 2 is provided with corresponding extension arm structures 121 ( b ), 122 ( b ).

[0039] The end of the sixth extension arm 122 away from the second positive electrode arm 12 is provided with a seventh extension arm 123, which is arranged on the side of the sixth extension arm 122 away from the positive connecting arm 13; the bottom of the sixth notch 216 is provided with a seventh notch 217, which is arranged on the side of the sixth notch 216 facing the negative connecting arm 23; the seventh extension arm 123 extends into the seventh notch 217. The positive electrode 1 and the negative electrode 2 are arranged to be centrally symmetrical, that is, as shown in FIG. Figure 2 As shown, the positive electrode 1 is provided with a corresponding notch structure 217 ( b ), and the negative electrode 2 is provided with a corresponding extension arm structure 123 ( b ).

[0040] At this time, the area utilization rate of the symmetrical battery cell is higher, and the charge can be effectively conducted out of the battery, and the effective battery capacity per unit area is further improved.

[0041] As an optional embodiment, refer to Figure 1 、 Figure 2 The first extension arm 111, the second extension arm 112, and the third extension arm 113 are all extended in a direction away from the first positive electrode arm 11, and the extension lengths of the first extension arm 111, the second extension arm 112, and the third extension arm 113 are equal. The fourth extension arm 114 extends to be flush with the side of the fifth extension arm 121 away from the sixth extension arm 122. The fifth extension arm 121 and the sixth extension arm 122 are extended in a direction toward the first positive electrode arm 11, and the extension lengths of the fifth extension arm 121 and the sixth extension arm 122 are equal. The seventh extension arm 123 extends to be flush with the third extension arm 113. At this time, the dividing seam between the positive electrode 1 and the negative electrode 2 of the symmetrical battery cell of this structure is smoother, which means that when a sheet is divided into two sets of the same positive electrodes or two sets of the same negative electrodes, the dividing seam is smoother, which is more conducive to improving the dividing efficiency and overall manufacturing efficiency.

[0042] As an alternative embodiment, the symmetrical battery cell includes at least two of the above electrode units.

[0043] Further as an optional embodiment, referring to Figure 4 the cross-sectional view of, the positive electrode 1 and the negative electrode 2 are both arranged to include an electrode body layer 10, a current collector layer 20, and a separator body layer 30. The current collector layer 20 is coated on the separator body layer 30, and the electrode body layer 10 is coated on the current collector layer 20. At this time, the formation processes of the positive electrode 1 and the negative electrode 2 refer to the symmetrical battery cell manufacturing method described below.

[0044] Further as an optional embodiment, referring to Figure 4 the cross-sectional view of, the separator body layer 30 is provided with permeation through-holes, and the current collector layer 20 is provided with a coating permeation structure passing through the permeation through-holes; an electrical connection layer 40 is provided on a side of the separator body layer 30 facing away from the current collector layer 20, and the electrical connection layer 40 is connected to the coating permeation structure. At this time, the electrical connection layer 40 can be directly formed by coating; the electrical connection layer 40 can also be formed by permeation. Preferably, the separator body layer 30 is arranged as a porous separator, and the electrical connection layer 40 is obtained by permeation of the current collector layer 20.

[0045] For the above symmetrical battery cell, it can refer to Figure 5 the schematic production process diagram ( Figure 6 showing an enlarged view of the entire electrode obtained by dividing and removing the gap region to obtain two identical electrode patterns) for division, and subsequent assembly to form an electrode battery cell. Specifically, it can be carried out according to the following symmetrical battery cell manufacturing method.

[0046] The present invention also provides a symmetrical battery cell manufacturing method for manufacturing the above symmetrical battery cell. The symmetrical battery cell manufacturing method includes the following steps:

[0047] Positive and negative electrode plates are obtained by coating. The positive and negative electrode plates are both arranged to include an electrode body layer 10, a current collector layer 20, and a separator body layer 30, as specifically described below.

[0048] It should be noted that the permeation through-holes provided in the separator body layer 30 can be realized either by arranging the separator body layer 30 as a porous separator or by machining the permeation through-holes. The following steps take the separator body layer 30 arranged as a porous separator as an example. Manufacturing the positive electrode plate includes the following steps:

[0049] Coating a current collector ink on the separator body layer 30 to form a current collector layer 20, a coating permeation structure, and an electrical connection layer 40, that is, the electrical connection layer 40 is obtained by permeation of the current collector layer 20;

[0050] Forming a positive electrode plate through a positive electrode layer, a current collector layer 20, a separator body layer 30, and an electrical connection layer 40;

[0051] Similarly, manufacturing the negative electrode plate includes the following steps:

[0052] Coat the collector ink on the separator body layer 30 to form the current collector layer 20, the coating penetration structure, and the electrical connection layer 40, that is, the electrical connection layer 40 is obtained by penetrating the current collector layer 20;

[0053] Form the negative electrode plate through the negative electrode layer, the current collector layer, the separator body layer, and the electrical connection layer;

[0054] When machining the penetration through holes by mechanical machining, the steps of manufacturing the positive and negative electrode plates further include: machining penetration through holes in the separator body layer 30, coating and forming the electrical connection layer 40 on one side of the separator body layer 30, and then coating the collector ink on the separator body layer 30 to form the current collector layer 20 and the coating penetration structure.

[0055] Refer to Figure 5 、 Figure 6 , the method for manufacturing the symmetric battery cell further includes the following steps: respectively dividing the above positive electrode plate and the above negative electrode plate to obtain two groups of positive electrodes 1 and two groups of negative electrodes 2; taking the machining of the positive electrode 1 as an example, refer to Figure 6 , according to the dividing seam represented by the blank seam, divide two groups of the same above positive electrodes 1. Among them, the dividing method includes die cutting or laser cutting. Dividing two groups of the same above negative electrodes 2 is the same. After the division, then assemble the positive electrode 1 and the negative electrode 2 respectively to obtain the above symmetric battery cell. Through the above division, the electrode body layer 10, the current collector layer 20, and the separator body layer 30 can be set to have flush outer contours.

[0056] Assemble the positive electrode 1 and the negative electrode 2. Specifically, it can be placed on a transfer base and aligned. Alignment structures such as alignment holes can be provided at the four corners for alignment to form the above electrode unit. After that, when manufacturing the battery, place the positive electrode 1 and the negative electrode 2 into the accommodation space; inject electrolyte into the accommodation space, thereby completing the production of the complete battery.

[0057] The method for manufacturing the symmetric battery cell can divide a plate into two groups of the same above positive electrodes 1 or two groups of the same above negative electrodes 2, and then correspondingly assemble two groups of the above symmetric battery cells, improving the manufacturing efficiency.

[0058] The present invention also proposes a method for manufacturing a battery. The method for manufacturing a battery is used to manufacture a battery. The battery includes the above symmetric battery cell. The method for manufacturing a battery includes the following steps:

[0059] Refer to Figure 7 , place the positive electrode 1 and the negative electrode 2 (corresponding to the electrode body layer 10) on the transfer base and align them. Alignment structures such as alignment holes can be provided at the four corners for alignment;

[0060] A conductive adhesive is provided on the electrical connection layer 40.

[0061] Further as an optional implementation manner, the battery manufacturing method further includes the following steps:

[0062] Place the electrical connection layer 40 on the battery substrate, and pins for electrically connecting with the conductive adhesive are provided on the battery substrate.

[0063] Further as an optional implementation manner, the battery manufacturing method further includes the following steps:

[0064] Form a battery pack by encapsulating the above-mentioned symmetrical battery cell group;

[0065] Divide the above-mentioned battery pack to obtain battery cells, which can be referred to Figure 8 .

[0066] It should be noted that the above-mentioned battery manufacturing method can also obtain electrode units through the following steps: divide the above-mentioned at least two electrode units, that is, form individual electrode units; form battery cells through the divided electrode units.

[0067] The present invention also proposes a battery, referring to Figure 9 , this battery includes the above-mentioned symmetrical battery cells; Figure 9 The shown battery cells can be obtained by performing cutting and other dividing processes on the symmetrical battery cells shown in Figure 8 and then assembling them individually. The battery further includes a first cover plate, a connection frame body, and a second cover plate. One side of the connection frame body is hermetically connected to the first cover plate, and the other side of the connection frame body is hermetically connected to the second cover plate to form an accommodation space for sealing the electrolyte; the accommodation space is used to accommodate the electrolyte, the positive electrode 1, and the negative electrode 2.

[0068] The battery, the symmetrical battery cell manufacturing method, and the battery manufacturing method proposed by the present invention all correspond to the above-mentioned symmetrical battery cells. The specific structure of the symmetrical battery cells refers to the above-mentioned embodiments. Since the battery, the symmetrical battery cell manufacturing method, and the battery manufacturing method proposed by the present invention correspond to all the technical solutions of the above-mentioned all embodiments, they at least have all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one. The above-mentioned accommodation space is only the preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention, or direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A method for manufacturing a symmetric battery cell, characterized in that, The method for manufacturing a symmetric battery cell is used to manufacture a symmetric battery cell, which includes an electrode unit. The electrode unit includes a positive electrode and a negative electrode. The positive electrode and the negative electrode are arranged in axial symmetry or central symmetry, and the electrode arms of the positive electrode are meshed with the electrode arms of the negative electrode. Both the positive electrode and the negative electrode are arranged to include an electrode body layer, a current collector layer, and a separator body layer. The current collector layer is coated on the separator body layer, and the electrode body layer is coated on the current collector layer. The electrode body layer, the current collector layer, and the separator body layer are arranged with their outer contours flush. The method for manufacturing the symmetric battery cell includes the following steps: The positive electrode plate and the negative electrode plate are obtained by coating. Both the positive electrode plate and the negative electrode plate are arranged to include an electrode body layer, a current collector layer, and a separator body layer. The positive electrode plate and the negative electrode plate are respectively divided to obtain two sets of the positive electrodes and two sets of the negative electrodes. The positive electrode and the negative electrode are assembled to form the electrode unit.

2. The method for manufacturing a symmetric battery cell according to claim 1, wherein The symmetric battery cell includes at least two of the electrode units. The positive electrode includes a first positive electrode arm, a positive connection arm, and a second positive electrode arm connected in sequence. The first positive electrode arm and the second positive electrode arm are arranged oppositely. The negative electrode includes a first negative electrode arm, a negative connection arm, and a second negative electrode arm connected in sequence. The first negative electrode arm and the second negative electrode arm are arranged oppositely. The first negative electrode arm extends between the first positive electrode arm and the second positive electrode arm. The first positive electrode arm, the first negative electrode arm, the second positive electrode arm, and the second negative electrode arm are arranged in sequence.

3. The method for manufacturing a symmetric battery cell according to claim 1, wherein, The separator body layer is provided with permeation through-holes, and the current collector layer is provided with a coating permeation structure passing through the permeation through-holes. On one side of the separator body layer facing away from the current collector layer, there is an electrical connection layer, and the electrical connection layer is connected to the coating permeation structure.

4. The method for manufacturing a symmetric battery cell according to claim 3, wherein, The separator body layer is arranged as a porous separator, and the electrical connection layer is obtained by permeation of the current collector layer.

5. A method for manufacturing a battery, characterized in that, The method for manufacturing a battery is used to manufacture a battery, which includes a symmetric battery cell as claimed in claim 3 or 4. The battery further includes a first cover plate, a connection frame body, and a second cover plate. One side of the connection frame body is hermetically connected to the first cover plate, and the other side of the connection frame body is hermetically connected to the second cover plate to form an accommodation space for sealing the electrolyte. The accommodation space is used to accommodate the electrolyte, the positive electrode, and the negative electrode. The method for manufacturing the battery includes the following steps: The positive electrode plate and the negative electrode plate are obtained by coating. Both the positive electrode plate and the negative electrode plate are arranged to include an electrode body layer, a current collector layer, and a separator body layer. The positive electrode plate and the negative electrode plate are respectively divided to obtain two sets of the positive electrodes and two sets of the negative electrodes. The positive electrode and the negative electrode are placed on a transfer substrate and aligned in position to assemble the positive electrode and the negative electrode to form the electrode unit. A conductive adhesive is provided on the electrical connection layer.

6. The battery manufacturing method according to claim 5, characterized in that, It further includes the following steps: The electrical connection layer is placed on a battery substrate, and the battery substrate is provided with pins for electrically connecting to the conductive adhesive.

7. The battery manufacturing method according to claim 6, characterized in that, It further includes the following steps: A battery pack is formed by the symmetric battery cell. Divide the battery pack to obtain battery cells.

Images