Battery structure

Abstract

The utility model relates to a battery structure. The battery structure includes: a case; the more than one cylindrical battery cell is arranged in the shell; the lithium storage structures are arranged in the shell, the side wall of at least one side of each lithium storage structure is provided with an arc-shaped groove, the arc-shaped grooves are attached to the arc-shaped surfaces of the cylindrical battery cells, and the lithium storage structures are electrically connected with the negative electrode of at least one cylindrical battery cell. On one hand, the lithium storage structure can be attached to the cylindrical battery cell and tightly arranged in the shell without additionally arranging a space, and on the other hand, lithium can be supplemented to the cylindrical battery cell through the lithium storage structure, so that the battery capacity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to a battery structure. Background Art

[0002] During the charging process of lithium-ion batteries, SEI (Solid Electrolyte Interface) is formed on the surface of the negative electrode, which consumes active lithium, resulting in a reduction in the active lithium available for circulation and a loss of battery capacity.

[0003] Traditional technology uses a lithium replenishment solution. After the first lithium ion charge, the lithium content in the negative electrode of the lithium-ion battery is increased by replenishing the electrolyte or the positive electrode to increase the battery capacity. However, for the battery cells that have been manufactured, the effect of lithium replenishment is limited. Utility Model Content

[0004] Based on this, it is necessary to provide a battery structure to address the problem that lithium is difficult to replenish in the battery structure.

[0005] A battery structure, comprising: a shell; one or more cylindrical battery cells, arranged in the shell; one or more lithium storage structures, arranged in the shell, the side wall of at least one side of the lithium storage structure having an arc-shaped groove, the arc-shaped groove is in contact with the arc-shaped surface of the cylindrical battery cell, and the lithium storage structure is electrically connected to the negative electrode of at least one of the cylindrical battery cells.

[0006] In one embodiment, the lithium storage structure includes one or more first lithium storage parts, and the first lithium storage parts are arranged in a first accommodating space formed between multiple cylindrical battery cells; wherein the side walls of the first lithium storage parts form multiple arc-shaped grooves, and one arc-shaped groove fits with the arc-shaped surface of a cylindrical battery cell.

[0007] In one embodiment, the battery structure includes a plurality of cylindrical battery cells arranged in an array, and more than three cylindrical battery cells surround and form the first accommodation space.

[0008] In one embodiment, the lithium storage structure includes a second lithium storage portion, and the second lithium storage portion is arranged in a second accommodating space formed between the cylindrical battery cell and the shell; wherein the side of the second lithium storage portion facing the shell is a plane so as to fit with the inner wall of the shell, and the side of the second lithium storage portion facing the cylindrical battery cell has an arc-shaped groove so as to fit with the adjacent cylindrical battery cell.

[0009] In one embodiment, the lithium storage structure includes a lithium source and a conductive member, wherein the conductive member is disposed inside the lithium source and electrically connected to the lithium source, and the conductive member is electrically connected to a negative electrode of at least one of the cylindrical battery cells.

[0010] In one embodiment, the lithium source is a lithium block, a lithium-copper composite strip, a lithium sheet or a lithium alloy.

[0011] In one embodiment, the lithium storage structure further includes a diaphragm, which covers the lithium source to isolate the lithium source from the cylindrical battery cell.

[0012] In one embodiment, the lithium source is a porous structure.

[0013] In one of the embodiments, the extension direction of the lithium source is consistent with the extension direction of the cylindrical battery core, and the conductive member penetrates the lithium source along the extension direction of the lithium source.

[0014] In one embodiment, the conductive member is S-shaped along the extension direction of the lithium source.

[0015] In the above-mentioned battery structure, a first lithium storage part is arranged in the shell of the battery structure, the lithium storage structure is electrically connected to the negative electrode of the cylindrical battery cell, and the side surface is constructed in an arc shape so as to fit with the cylindrical side surface. When the lithium storage structure and the cylindrical battery cell are placed in the shell at the same time, on the one hand, the lithium storage structure can fit with the cylindrical battery cell and be arranged tightly inside the shell without the need for additional space. On the other hand, the lithium storage structure can be used to supplement lithium to the cylindrical battery cell to increase the battery capacity. Through the above-mentioned battery structure, a method for supplementing lithium to the battery structure is provided to improve the lithium supplement effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a battery structure in one embodiment;

[0017] Figure 2 FIG. 4 is a top view of a battery structure in one embodiment.

[0018] Figure 3 Schematic diagram of the shape of the first lithium storage portion in one embodiment.

[0019] Figure 4 Schematic diagram of the shape of the second lithium storage portion in one embodiment.

[0020] Figure 5 Schematic diagram of the connection between the first lithium storage unit and the cylindrical battery cell in one embodiment.

[0021] Figure 6 Schematic diagram of the structure of the first lithium storage unit in one embodiment.

[0022] Figure 7 2 is a cross-sectional view of a lithium storage structure in one embodiment.

[0023] Description of reference numerals:

[0024] 10. Shell; 20. Cylindrical battery cell; 21. Negative electrode tab; 30. Lithium storage structure; 301. First lithium storage unit; 302. Second lithium storage unit; 31. Conductive member; 32. Lithium source; 33. Diaphragm. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0031] The cylindrical battery cell is prepared by winding and has a cylindrical structure. When used in a battery pack, multiple cylindrical batteries are placed in the shell, occupying most of the battery shell space. However, due to its cylindrical structure, an arc area is formed between the multiple cylindrical batteries, and the space in the arc area reduces the utilization rate of the space inside the battery.

[0032] Meanwhile, lithium supplementation is a common way to increase battery capacity and prolong cycle time. The space inside the prepared cylindrical battery cell 20 has been fully utilized and no additional lithium source can be added for lithium supplementation, so the capacity improvement effect is limited.

[0033] Based on this, the present application proposes a battery structure, which performs additional lithium compensation in the arc area between the cylindrical battery cells, which can not only improve the long cycle performance of the battery but also improve the initial efficiency of the battery and rationally utilize the battery structure space.

[0034] See also Figure 1 , Figure 1 A structural schematic diagram of a battery structure in an embodiment of the utility model is shown. The battery structure provided by an embodiment of the utility model includes a shell 10, one or more cylindrical battery cells 20 and one or more lithium storage structures 30. The cylindrical battery cells 20 and the lithium storage structures 30 are both arranged in the shell 10. The cylindrical battery cells 20 serve as energy storage units, and the lithium storage structures 30 are used to replenish lithium for the cylindrical battery cells 20.

[0035] The number of the cylindrical battery cells 20 may be one or more than two, all of which are disposed in the housing 10. Further, the number of the cylindrical battery cells 20 may be more than three, so that an arc-shaped area is formed between the three cylindrical battery cells 20.

[0036] The number of the lithium storage structure 30 can be one or more than two, all of which are arranged in the shell 10. The side wall of at least one side of the lithium storage structure 30 has an arc-shaped groove, and the arc-shaped groove fits the arc-shaped surface of the cylindrical battery cell 20, so that the side wall of the lithium storage structure 30 and the side wall of the cylindrical battery cell 20 are in close contact and are closely arranged in the shell 10.

[0037] At the same time, the lithium storage structure 30 is electrically connected to the negative electrode of at least one cylindrical battery cell 20. Exemplarily, one lithium storage structure 30 can be electrically connected to one cylindrical battery cell 20, and can also be electrically connected to multiple cylindrical battery cells 20. Exemplarily, one cylindrical battery cell 20 can be connected to one lithium storage structure 30, and can also be connected to multiple lithium storage structures 30.

[0038] When the battery structure housing 10 is filled with electrolyte, since metallic lithium has a lower potential than any negative electrode material, when there is electrolyte, the lithium storage structure 30 will spontaneously lose electrons, and lithium ions will enter the cylindrical battery core 20 through the electrolyte. By discharging the battery structure at a constant current, a large amount of lithium ions can be replenished through the lithium storage structure 30.

[0039] In the above-mentioned battery structure, a lithium storage structure 30 is arranged in the shell 10 of the battery structure. The lithium storage structure 30 is electrically connected to the negative electrode of the cylindrical battery cell 20, and the side surface is constructed to be arc-shaped so as to fit with the cylindrical side surface. When the lithium storage structure 30 and the cylindrical battery cell 20 are placed in the shell 10 at the same time, on the one hand, the lithium storage structure 30 can fit with the cylindrical battery cell 20 and be closely arranged inside the shell 10 without the need for additional space. On the other hand, the cylindrical battery cell 20 can be supplemented with lithium through the lithium storage structure 30 to increase the battery capacity. Through the above-mentioned battery structure, a method for supplementing lithium to the battery is provided to improve the lithium supplementation effect.

[0040] In some embodiments, the material of the shell 10 can be an aluminum shell, an aluminum alloy or stainless steel. The cylindrical battery cell 20 includes a positive electrode sheet, a negative electrode sheet and a diaphragm. The positive electrode active material in the positive electrode sheet can be but is not limited to one or more of lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, nickel cobalt manganese oxide ternary material, nickel cobalt aluminum oxide ternary material, and lithium manganese iron phosphate. The negative electrode active material in the negative electrode sheet can be but is not limited to one or more of graphite, silicon oxide, silicon oxide, silicon-carbon composite material, alloy negative electrode material, and metal oxide negative electrode material. The diaphragm can be but is not limited to polyethylene, polypropylene, glass fiber, ceramic-coated polyethylene or ceramic-coated polypropylene.

[0041] In some embodiments, see Figure 2 , Figure 2 A top view of a battery structure in an embodiment is shown. An arc-shaped area, namely a first accommodation space, is formed between the multiple cylindrical battery cells 20, and each side surface of the first accommodation space is arc-shaped. The lithium storage structure 30 includes one or more first lithium storage parts 301, and the first lithium storage part 301 is arranged in the first accommodation space formed between the multiple cylindrical battery cells 20; wherein, the side wall of the first lithium storage part 301 forms a plurality of arc-shaped grooves, and one arc-shaped groove fits with the arc-shaped surface of a cylindrical battery cell. In order to enable the first lithium storage part 301 to be arranged in the first accommodation space and to fit closely with each cylindrical battery cell 20, the side wall of the first lithium storage part 301 forms a plurality of arc-shaped grooves, and each arc-shaped groove fits with the arc-shaped side wall of the cylindrical battery cell 20.

[0042] Exemplarily, a triangular prism-like first accommodation space with concave arc-shaped sides is formed between the three cylindrical battery cells 20. At this time, the first lithium storage portion 301 can be a triangular prism with arc-shaped grooves on the sides, which fits the triangular prism-like first accommodation space.

[0043] Exemplarily, a first cube-like accommodation space with concave arc-shaped sides is formed between the four cylindrical battery cells 20. At this time, the first lithium storage portion 301 can be a cube with arc-shaped grooves on the sides, which fits the first cube-like accommodation space.

[0044] For the cylindrical battery cell 20, since its side surface is curved, the adjacent cylindrical battery cells 20 and the cylindrical battery cells 20 and the shell 10 cannot fit tightly together, forming a first accommodation space with curved sides, that is, an arc-shaped area. The space in the arc-shaped area reduces the utilization rate of the space in the battery structure. The space in a single cylindrical battery cell 20 has been fully utilized and it is impossible to add additional lithium sources 32 for lithium supplementation. The disadvantage of the arc-shaped area is that it reduces the gram capacity of the battery. However, by providing a first lithium storage unit 301 in the arc-shaped area, the battery capacity can be increased through the first lithium storage unit 301, and the first lithium storage unit 301 is fitted into the first accommodation space without the need to increase additional space.

[0045] Continue to see Figure 2 In some embodiments, the battery structure includes a plurality of cylindrical cells 20 arranged in an array, and three or more cylindrical cells 20 surround a first accommodation space. The plurality of cylindrical cells 20 with the same specifications are arranged in an array, so that the plurality of first accommodation spaces are also arranged in an array, thereby improving the utilization rate of the space of the housing 10.

[0046] For example, in this embodiment, the battery structure includes two rows and five columns of cylindrical cells 20 arranged in an array, such as Figure 2 In the area A shown, a first accommodation space is formed between four adjacent cylindrical cells 20, and the first accommodation space is a quadrilateral with arc-shaped sides. Figure 3 , Figure 3A schematic diagram of the shape of the first lithium storage portion 301 in an embodiment is shown, and the first lithium storage portion 301 is a quadrilateral with arc-shaped sides.

[0047] It is understandable that the multiple battery structures can also be distributed in a staggered array, so that a first accommodation space is formed between three adjacent cylindrical battery cells 20, and the first accommodation space is a triangle with arc-shaped sides.

[0048] Continue to see Figure 1 and Figure 2 In some embodiments, a second accommodation space is formed between the cylindrical battery cell 20 and the shell 10. Exemplarily, a cylindrical battery cell located at the side edge of the shell 10 forms a second accommodation space with the shells 10 on both sides. Exemplarily, a second accommodation space is also formed between two adjacent cylindrical battery cells 20 and the shell 10. Since the cylindrical battery cell 20 is cylindrical, it can only achieve line contact with the shell of the square battery structure, and a second accommodation space is formed between two adjacent cylindrical battery cells 20 and the shell 10, resulting in a reduction in the space utilization of the shell 10.

[0049] In some embodiments, the lithium storage structure 30 includes a second lithium storage portion 302, and the second lithium storage portion 302 is disposed in a second accommodation space formed between the cylindrical battery cell 20 and the shell 10. The side of the second lithium storage portion 302 facing the shell 10 is a plane to fit with the inner wall of the shell 10, and the side of the second lithium storage portion 302 facing the cylindrical battery cell 20 has an arc-shaped groove to fit with the adjacent cylindrical battery cell 20.

[0050] See also Figure 4 , Figure 4 The schematic diagram of the shape of the second lithium storage part 302 in one embodiment is shown. In this embodiment, the second storage space is configured with the second lithium storage part 302, the first side of the second lithium storage part 302 is in contact with the inner wall of the shell 10, and the second lithium storage part 302 has an arc-shaped groove on the side facing the cylindrical battery cell 20 to respectively contact with the adjacent cylindrical battery cell 20, so that the second lithium storage part 302 can be configured in the second storage space. The second lithium storage part 302 is electrically connected to the negative electrode of at least one cylindrical battery cell 20, and its function is similar to that of the first lithium storage part 301. The second lithium storage part 302 can release lithium ions to increase the battery capacity.

[0051] In some embodiments, the lithium storage structure 30 includes a lithium source 32 and a conductive member 31, wherein the conductive member 31 is disposed inside the lithium source 32 and electrically connected to the lithium source 32, and the conductive member 31 is electrically connected to the negative electrode of at least one cylindrical battery cell 20. Figure 5 , Figure 5A schematic diagram of the connection between the first lithium storage unit 301 and the cylindrical battery cell 20 in one embodiment is shown. It is understandable that the structure of the second lithium storage unit 302 can be the same as the first lithium storage unit 301. Exemplarily, the lithium source 32 can be a lithium block, a lithium-copper composite strip, a lithium sheet or a lithium alloy.

[0052] The conductive part 31 of the first lithium storage part 301 is electrically connected to the negative electrode tab 21 of the cylindrical battery cell 20. Since metallic lithium has a lower potential than any negative electrode material, when there is electrolyte in the shell 10, the lithium source 32 will spontaneously lose electrons to generate lithium ions, and the lithium ions will enter the interior of the cylindrical battery cell 20 through the electrolyte, thereby increasing the battery capacity.

[0053] In some embodiments, the lithium storage structure 30 further includes a separator 33, which covers the lithium source 32 to isolate the lithium source 32 from the cylindrical battery cell 20. Figure 6 As shown, Figure 6 3 is a schematic diagram of the structure of the first lithium storage unit 301 in an embodiment. The wound diaphragm 33 can not only ensure the insulation of the lithium source 32 from external elements but also absorb electrolyte, and can realize ion transmission between the lithium source 32 and the cylindrical battery cell 20. It can be understood that the structure of the second lithium storage unit 302 can be the same as that of the first lithium storage unit 301.

[0054] In some embodiments, the material of the diaphragm 33 includes a polymer compound. Exemplarily, the diaphragm 33 of the lithium storage structure 30 can be consistent with the diaphragm of the cylindrical battery cell 20. It can be but not limited to polyethylene, polypropylene, glass fiber, ceramic-coated polyethylene or ceramic-coated polypropylene. In a feasible implementation, the lithium source 32 is first wrapped with the diaphragm 33, such as after wrapping at least 3 turns, to form a lithium storage structure 30, which is placed in the first accommodation space and / or the second accommodation space. Exemplarily, the thickness of the diaphragm 33 is less than 0.2 mm.

[0055] In a feasible implementation, the pre-lithium process using the battery structure provided in this embodiment may include two stages. The first stage is initialization pre-lithium. At the beginning of this stage, after the electrolyte is injected into the battery structure, the battery structure is placed in a 30°C-50°C environment and left for 24h-72h for aging. In the second stage of pre-lithium, when the battery structure needs to be replenished with lithium, it only needs to be discharged at a constant current to make the lithium metal of the lithium storage structure 30 release lithium ions into the cylindrical battery cell 20. For example, under a certain voltage range, the discharge current is controlled for continuous discharge.

[0056] In this way, the lithium storage structure 30 is completely separated from the cylindrical battery cell 20, which greatly improves safety. In addition, the battery structure can be adaptively selected to replenish lithium when necessary, which will not cause uncontrolled replenishment of lithium ions, causing excessive lithium ions to be added to the system, and lead to lithium deposition at the negative electrode.

[0057] In some embodiments, the lithium source 32 is a porous structure with a plurality of holes inside. In some feasible implementations, the size of the hole can be 0.1 mm-0.5 mm. In this way, it is convenient for the lithium storage part to contact with the electrolyte, so that the lithium ions generated by the metal lithium enter the electrolyte, the contact area between the lithium source 32 and the electrolyte is increased, and the generation efficiency of lithium ions is increased, so that the lithium ions can enter the cylindrical battery cell 20.

[0058] Continue to see Figure 5 In some embodiments, the extension direction of the lithium source 32 is consistent with the extension direction of the cylindrical battery cell 20, and the conductive member 31 penetrates the lithium source 32 along the extension direction of the lithium source 32. Exemplarily, the extension direction of the cylindrical battery cell 20 refers to its length direction, that is, the direction from the positive electrode to the negative electrode, or the direction from the negative electrode to the positive electrode. The extension direction of the lithium source 32 is consistent with the extension direction of the cylindrical battery cell 20, thereby maximizing the volume of the lithium source 32 and increasing the volume ratio of the lithium source 32 in the shell 10, thereby maximizing the capacity allowed for lithium replenishment.

[0059] like Figure 7 As shown, Figure 7 A cross-sectional view of a lithium storage structure 30 in one embodiment is shown. The conductive member 31 is S-shaped along the extension direction of the lithium source 32. In this way, the contact area between the conductive member 31 and the lithium source 32 can be increased, so that when lithium is replenished, a larger area of ​​lithium metal in the lithium source 32 loses electrons to obtain lithium ions, thereby improving the lithium replenishment efficiency.

[0060] The embodiment of the present application also provides an electric device, which includes at least one battery structure described in the above embodiment. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like. It is understandable that the battery structure can be used to connect to the motor on the electric device. The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A battery structure, characterized in that: The battery structure comprises: case; One or more cylindrical battery cells are disposed in the housing; More than one lithium storage structure is arranged in the shell, and the side wall of at least one side of the lithium storage structure has an arc-shaped groove, and the arc-shaped groove fits the arc-shaped surface of the cylindrical battery cell. The lithium storage structure is electrically connected to the negative electrode of at least one of the cylindrical battery cells.

2. The battery structure according to claim 1, characterized in that: The lithium storage structure includes more than one first lithium storage part, and the first lithium storage part is configured in a first accommodating space formed between multiple cylindrical battery cells; wherein the side wall of the first lithium storage part forms multiple arc-shaped grooves, and one arc-shaped groove fits with the arc-shaped surface of a cylindrical battery cell.

3. The battery structure according to claim 2, characterized in that: The battery structure includes a plurality of cylindrical battery cells arranged in an array, and more than three cylindrical battery cells surround and form the first accommodation space.

4. The battery structure according to claim 1 or 2, characterized in that: The lithium storage structure includes a second lithium storage part, which is arranged in a second accommodating space formed between the cylindrical battery cell and the shell; wherein the side of the second lithium storage part facing the shell is a plane so as to fit with the inner wall of the shell, and the side of the second lithium storage part facing the cylindrical battery cell has an arc-shaped groove so as to fit with the adjacent cylindrical battery cell.

5. The battery structure according to claim 1, characterized in that: The lithium storage structure includes a lithium source and a conductive member, wherein the conductive member is disposed inside the lithium source and electrically connected to the lithium source, and the conductive member is electrically connected to the negative electrode of at least one of the cylindrical battery cells.

6. The battery structure according to claim 5, characterized in that: The lithium source is a lithium block, a lithium-copper composite belt, a lithium sheet or a lithium alloy.

7. The battery structure according to claim 5, characterized in that: The lithium storage structure also includes a diaphragm, which covers the lithium source to isolate the lithium source from the cylindrical battery core.

8. The battery structure according to claim 5, characterized in that: The lithium source has a porous structure.

9. The battery structure according to claim 5, characterized in that: The extension direction of the lithium source is consistent with the extension direction of the cylindrical battery core, and the conductive member penetrates the lithium source along the extension direction of the lithium source.

10. The battery structure according to claim 9, characterized in that: The conductive member is S-shaped along the extension direction of the lithium source.

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