Ion battery structure for supplementing active matter

Abstract

The utility model provides an ion battery structure for supplementing active matters, which comprises at least one battery cell unit, and an active matter supplementing electrode is arranged in the battery cell unit; the active matter supplementary electrode is arranged on the outermost side of the battery cell unit or the active matter supplementary electrode is arranged in the middle of the battery cell unit; at least one side surface of the active matter supplement electrode is coated with an active matter, and the side surface coated with the active matter is arranged close to the positive plate or the negative plate of the battery cell unit. According to the structure, the through holes are formed in the positive electrode foil and the negative electrode foil, so that the uniform distribution of active ions can be effectively improved, and the safety and the electrical performance of the battery cell unit are further effectively improved. The battery cell is simple in structure, can realize controllable supplement of active matters in the use process of the battery cell, and ensures the concentration of active ions in the later period of the battery, thereby prolonging the cycle life of the battery cell.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to an ion battery structure for replenishing active substances. Background Art

[0002] With the rapid development of new energy technologies in my country, electrochemical energy storage has been widely used due to its environmental protection, energy saving, high efficiency, and flexibility. Among them, lithium-ion battery energy storage accounts for more than 90% of electrochemical energy storage applications.

[0003] Lithium-ion batteries for energy storage pay more attention to the characteristics of high safety, long life, stability and low self-discharge rate. In order to achieve the long life characteristics of lithium-ion batteries, the selection of lithium-rich positive and negative electrode raw materials or the use of lithium replenishment technology has become one of the effective solutions. However, the current lithium replenishment technology is mainly reflected in the release of active lithium ions before the battery leaves the factory. It cannot achieve effective lithium replenishment effect in the later stage of the cycle, which limits the upper limit of the application life of the battery to a certain extent. Utility Model Content

[0004] The present invention provides an ion battery structure for replenishing active substances, aiming to solve the problems that the existing lithium-ion battery structure cannot controllably replenish lithium during use, cannot achieve effective lithium replenishment effect in the late cycle, and limits the upper limit of the battery's application life to a certain extent.

[0005] To achieve the above-mentioned purpose, an embodiment of the utility model provides an ion battery structure for supplementing active substances, comprising at least one battery cell unit, wherein an active substance supplementing electrode is arranged in the battery cell unit; the active substance supplementing electrode is arranged at the outermost side of the battery cell unit or the active substance supplementing electrode is arranged in the middle of the battery cell unit; at least one side of the active substance supplementing electrode is coated with an active substance, and the side coated with the active substance is arranged close to the positive electrode sheet or the negative electrode sheet of the battery cell unit.

[0006] As a preferred embodiment, a separator is provided on the outer side of the active material supplement electrode, between the active material supplement electrode and the positive electrode sheet, between the active material supplement electrode and the negative electrode sheet, and between the positive electrode sheet and the negative electrode sheet.

[0007] As a preferred embodiment, the isolation membrane is respectively matched with the active material supplementary electrode, the positive electrode sheet, and the negative electrode sheet.

[0008] As a preferred embodiment, at least one active material supplementing electrode is provided, and a supplementing electrode tab is provided at one end of the active material supplementing electrode.

[0009] As a preferred embodiment, the positive electrode sheet includes a positive electrode foil, a positive electrode active layer coated on both sides of the positive electrode foil, and a positive electrode ear arranged at one end of the positive electrode foil; and a plurality of first through holes are arranged on the positive electrode foil.

[0010] As a preferred embodiment, a plurality of the first through holes are evenly arranged, and the first through holes are arranged at equal intervals; the first through holes, the positive electrode tabs and the positive electrode foil are integrally arranged.

[0011] As a preferred embodiment, the negative electrode sheet includes a negative electrode foil, a negative electrode active layer coated on both sides of the negative electrode foil, and a negative electrode ear arranged at one end of the negative electrode foil; and a plurality of second through holes are arranged on the negative electrode foil.

[0012] As a preferred embodiment, a plurality of the second through holes are evenly arranged, and the second through holes are arranged at equal intervals; the second through holes, the negative electrode tab and the negative electrode foil are integrally arranged.

[0013] As a preferred embodiment, the battery cell unit is a laminated structure battery cell unit or a wound structure battery cell unit.

[0014] As a preferred embodiment, when the battery cell unit is a laminated structure battery cell unit, the supplementary electrode tab, the positive tab and the negative tab are arranged on the same side of the battery cell unit, and the supplementary electrode tab, the positive tab and the negative tab are arranged alternately.

[0015] As a preferred embodiment, the ion battery structure is a lithium ion battery structure or a sodium ion battery structure.

[0016] As a preferred embodiment, when the ion battery structure is a lithium ion battery structure, the active material supplement electrode is a lithium sheet electrode or a lithium-rich material electrode;

[0017] When the ion battery structure is a sodium ion battery structure, the active material supplement electrode is a sodium sheet electrode or a sodium-rich material electrode.

[0018] As a preferred embodiment, the active substance supplement ion battery structure also includes a three-pole cover plate, on which a positive electrode column, a negative electrode column and a supplementary electrode column are arranged, and the supplementary electrode column is arranged between the positive electrode column and the negative electrode column; the positive electrode column is connected to the positive electrode ear, the supplementary electrode column is connected to the supplementary electrode ear, and the negative electrode column is connected to the negative electrode ear.

[0019] As a preferred embodiment, the three-pole cover plate is also provided with a liquid injection hole and an explosion-proof valve, the explosion-proof valve is arranged at one end of the three-pole cover plate close to the negative pole, and the liquid injection hole is arranged at one end of the three-pole cover plate close to the positive pole.

[0020] As a preferred embodiment, the active substance supplementing ion battery structure further includes a shell, which is arranged on the outside of the battery cell unit, and the three-pole cover is arranged on an end surface of one end of the shell.

[0021] The structure of the present application can effectively improve the uniform distribution of active ions by setting through holes on the positive electrode foil and the negative electrode foil, thereby effectively improving the safety and electrical performance of the battery cell unit. By setting an active material supplement electrode, the independent active material supplement electrode does not participate in the reaction in the early stage of the battery cell use, has little effect on the battery cell electrode design (such as surface density, compaction, margin, etc.), and can greatly exert the performance of the battery cell unit itself. The active material supplement electrode can realize the quantitative supplement of active materials, can give full play to the performance advantages of the product, and can greatly improve the service life of the battery cell in the later stage. The structure of the present application is simple, and can realize the controllable supplement of active materials during the use of the battery cell, ensure the concentration of active lithium ions (or sodium ions) in the later stage of the battery, thereby improving the cycle life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the overall structure of an ion battery structure for replenishing active substances according to an embodiment of the utility model;

[0024] Figure 2 This is a schematic structural diagram of a cell unit of an active substance supplementing ion battery structure according to an embodiment;

[0025] Figure 3 yes Figure 2 Schematic diagram of the exploded structure of the positive electrode sheet of the battery cell unit;

[0026] Figure 4 yes Figure 2 Schematic diagram of the exploded structure of the negative electrode sheet of the battery cell unit;

[0027] Figure 5 yes Figure 2 A schematic diagram of the structure of the active material supplement electrode of the battery cell unit;

[0028] Figure 6 is a schematic structural diagram of a battery cell unit of an ion battery structure for supplementing active substances according to another embodiment;

[0029] Figure 7It is a structural schematic diagram of a battery cell unit of an ion battery structure for supplementing active substances in yet another embodiment. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] In this application, 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 this application can be understood according to specific circumstances.

[0033] 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 an intermediate 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 an intermediate element at the same time.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used 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 defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is 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 utility model.

[0035] Specifically, Figure 1 to Figure 2As shown, an embodiment of the utility model provides an ion battery structure for supplementing active substances, including at least one battery cell unit 10, wherein an active substance supplement electrode 11 is arranged in the battery cell unit 10; the active substance supplement electrode 11 is arranged at the outermost side of the battery cell unit 10; at least one side of the active substance supplement electrode 11 is coated with an active substance, and the side coated with the active substance is arranged close to the positive electrode sheet 12 or the negative electrode sheet 13 of the battery cell unit 10.

[0036] In other embodiments, Figure 6 As shown, the active material supplement electrode 11 is arranged in the middle of the battery cell 10 (preferably at the geometric center).

[0037] As a preferred embodiment, an isolation film 14 is provided on the outside of the active material supplementary electrode 11, between the active material supplementary electrode 11 and the positive electrode sheet 12, between the active material supplementary electrode 11 and the negative electrode sheet 13, and between the positive electrode sheet 12 and the negative electrode sheet 13.

[0038] As a preferred embodiment, the isolation film 14 is respectively configured to match the active material supplementary electrode 11 , the positive electrode sheet 12 , and the negative electrode sheet 13 .

[0039] As a preferred embodiment, Figure 5 As shown, at least one active material supplementary electrode 11 is provided, and a supplementary electrode tab 111 is provided at one end of the active material supplementary electrode 11 .

[0040] As a preferred embodiment, Figure 3 As shown, the positive electrode sheet 12 includes a positive electrode foil 121 , a positive electrode active layer 122 coated on both sides of the positive electrode foil 121 , and a positive electrode ear 123 arranged at one end of the positive electrode foil 121 ; the positive electrode foil 121 is provided with a plurality of first through holes 1211 .

[0041] As a preferred embodiment, a plurality of the first through holes 1211 are evenly arranged, and the first through holes 1211 are arranged at equal intervals; the first through holes 1211 , the positive electrode tab 123 and the positive electrode foil 121 are integrally arranged.

[0042] As a preferred embodiment, Figure 4 As shown, the negative electrode sheet 13 includes a negative electrode foil 131 , a negative electrode active layer 132 coated on both sides of the negative electrode foil 131 , and a negative electrode ear 133 disposed at one end of the negative electrode foil 131 ; the negative electrode foil 131 is provided with a plurality of second through holes 1311 .

[0043] As a preferred embodiment, a plurality of the second through holes 1311 are evenly arranged, and the second through holes 1311 are arranged at equal intervals; the second through holes 1311 , the negative electrode tab 133 and the negative electrode foil 131 are integrally arranged.

[0044] As a preferred embodiment, the battery cell unit 10 is a laminated structure battery cell unit or a wound structure battery cell unit.

[0045] As a preferred embodiment, when the battery cell unit 10 is a laminated structure battery cell unit, the supplementary electrode tab 111, the positive tab 123 and the negative tab 133 are arranged on the same side of the battery cell unit 10, and the supplementary electrode tab 111, the positive tab 123 and the negative tab 133 are arranged alternately.

[0046] When the battery cell unit 10 is a laminated battery cell unit, the laminated structure is used. Figure 2 As shown, when the active material supplement electrode is set at the outermost layer of the battery cell unit, the active material can be coated on only one side, and the side coated with the active material corresponds to the positive electrode sheet or the negative electrode sheet; the lamination method adopts a "Z"-shaped lamination process, and the lamination of a single bare battery cell is completed through the combined lamination method of "separator + active material supplement electrode + separator + positive electrode sheet or negative electrode sheet + separator + negative electrode sheet or positive electrode sheet... + positive electrode sheet or negative electrode sheet + separator + active material supplement electrode + separator". Figure 6 As shown, when the active material supplement electrode is arranged in the middle of the battery cell unit (preferably at the geometric center), the form of "positive electrode sheet or negative electrode sheet + isolation membrane + active material supplement electrode + isolation membrane + positive electrode sheet or negative electrode sheet" can be adopted, the polarities on both sides can be the same or opposite, and the active material supplement electrode can be coated with active material on one side or both sides.

[0047] like Figure 7 As shown, when the battery cell unit is a wound structure battery cell unit, a winding method is adopted, and the active material supplementary electrode can be stacked according to the stacking method when the active material supplementary electrode is set at the outermost layer of the battery cell unit, and then wound into a single battery cell.

[0048] After the battery cells are stacked or wound, the tabs corresponding to the positive electrode sheet, negative electrode sheet, and active material supplementary electrode are connected to the cover plate or led out to the outside of the soft-pack battery cell to complete the battery cell assembly.

[0049] During the normal operation of the positive and negative electrodes, the active material supplement electrode does not work. When the active material needs to be supplemented in the later stage of the cycle, the positive electrode sheet (or negative electrode sheet) is connected to the active material supplement electrode to form a loop. The active ions enter the corresponding electrode sheet through charging and discharging. The charge and discharge current and charge and discharge time can be adjusted to achieve quantitative supplementation of the active material, and then gradually diffuse inward through the through holes on the positive electrode foil (or negative electrode foil), thereby realizing the active material supplementation of the entire battery cell, which not only slows down the capacity decay, but also improves the module consistency and effectively increases the cycle life of the ion battery, thereby achieving ultra-long cycle.

[0050] As a preferred embodiment, the ion battery structure is a lithium ion battery structure or a sodium ion battery structure.

[0051] As a preferred embodiment, when the ion battery structure is a lithium ion battery structure, the active material supplement electrode is a lithium sheet electrode or a lithium-rich material electrode;

[0052] When the ion battery structure is a sodium ion battery structure, the active material supplement electrode is a sodium sheet electrode or a sodium-rich material electrode.

[0053] As a preferred embodiment, the active substance supplement ion battery structure also includes a three-pole cover plate 20, on which a positive electrode column 21, a negative electrode column 22 and a supplementary electrode column 23 are arranged, and the supplementary electrode column 23 is arranged between the positive electrode column 21 and the negative electrode column 22; the positive electrode column 21 is connected to the positive electrode ear 123, the supplementary electrode column 23 is connected to the supplementary electrode ear 111, and the negative electrode column 22 is connected to the negative electrode ear 133.

[0054] As a preferred embodiment, the three-pole cover plate 20 is also provided with an injection hole 24 and an explosion-proof valve 25. The explosion-proof valve 25 is arranged at one end of the three-pole cover plate 20 close to the negative pole column 22, and the injection hole 24 is arranged at one end of the three-pole cover plate 20 close to the positive pole column 21.

[0055] As a preferred embodiment, the active substance supplementing ion battery structure further includes a shell 30 , which is disposed on the outside of the battery cell unit 10 , and the three-pole cover plate 20 is disposed on an end surface of one end of the shell 30 .

[0056] The structure of the present application can effectively improve the uniform distribution of active ions by setting through holes on the positive electrode foil and the negative electrode foil, thereby effectively improving the safety and electrical performance of the battery cell unit. By setting an active material supplement electrode, the independent active material supplement electrode does not participate in the reaction in the early stage of the battery cell use, has little effect on the battery cell electrode design (such as surface density, compaction, margin, etc.), and can greatly exert the performance of the battery cell unit itself. The active material supplement electrode can realize the quantitative supplement of active materials, can give full play to the performance advantages of the product, and can greatly improve the service life of the battery cell in the later stage. The structure of the present application is simple, and can realize the controllable supplement of active materials during the use of the battery cell, ensure the concentration of active lithium ions (or sodium ions) in the later stage of the battery, thereby improving the cycle life of the battery cell.

[0057] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0058] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ion battery structure for replenishing active substances, characterized in that: It includes at least one battery cell unit, in which an active material supplement electrode is arranged; the active material supplement electrode is arranged at the outermost side of the battery cell unit or the active material supplement electrode is arranged in the middle of the battery cell unit; at least one side of the active material supplement electrode is coated with an active material, and the side coated with the active material is arranged close to the positive electrode sheet or the negative electrode sheet of the battery cell unit.

2. The active substance supplement ion battery structure according to claim 1, characterized in that: Separating films are provided on the outside of the active material supplementing electrode, between the active material supplementing electrode and the positive electrode sheet, between the active material supplementing electrode and the negative electrode sheet, and between the positive electrode sheet and the negative electrode sheet; The isolation membrane is respectively matched with the active material supplementary electrode, the positive electrode sheet, and the negative electrode sheet.

3. The active substance supplement ion battery structure according to claim 1, characterized in that: At least one active material supplementing electrode is provided, and a supplementing electrode tab is provided at one end of the active material supplementing electrode.

4. The active substance supplement ion battery structure according to claim 3, characterized in that: The positive electrode sheet comprises a positive electrode foil, a positive electrode active layer coated on both sides of the positive electrode foil, and a positive electrode ear arranged at one end of the positive electrode foil; the positive electrode foil is provided with a plurality of first through holes; The negative electrode sheet comprises a negative electrode foil, a negative electrode active layer coated on both sides of the negative electrode foil and a negative electrode ear arranged at one end of the negative electrode foil; and a plurality of second through holes are arranged on the negative electrode foil.

5. The active substance supplementing ion battery structure according to claim 4, characterized in that: A plurality of the first through holes are evenly arranged, and the first through holes are arranged at equal intervals; the first through holes, the positive electrode tabs and the positive electrode foil are integrally arranged; A plurality of the second through holes are evenly arranged, and the second through holes are arranged at equal intervals; the second through holes, the negative electrode tab and the negative electrode foil are integrally arranged.

6. The active substance supplement ion battery structure according to claim 5, characterized in that: The battery cell unit is a laminated structure battery cell unit or a wound structure battery cell unit; When the battery cell unit is a laminated structure battery cell unit, the supplementary electrode tab, the positive tab and the negative tab are arranged on the same side of the battery cell unit, and the supplementary electrode tab, the positive tab and the negative tab are arranged alternately.

7. The active substance supplement ion battery structure according to claim 1, characterized in that: The ion battery structure is a lithium ion battery structure or a sodium ion battery structure; When the ion battery structure is a lithium ion battery structure, the active material supplement electrode is a lithium sheet electrode or a lithium-rich material electrode; When the ion battery structure is a sodium ion battery structure, the active material supplement electrode is a sodium sheet electrode or a sodium-rich material electrode.

8. The active substance supplementing ion battery structure according to claim 6, characterized in that: The active substance supplement ion battery structure also includes a three-pole cover plate, on which a positive electrode column, a negative electrode column and a supplementary electrode column are arranged, and the supplementary electrode column is arranged between the positive electrode column and the negative electrode column; the positive electrode column is connected to the positive electrode ear, the supplementary electrode column is connected to the supplementary electrode ear, and the negative electrode column is connected to the negative electrode ear.

9. The active substance supplement ion battery structure according to claim 8, characterized in that: The three-pole cover plate is also provided with a liquid injection hole and an explosion-proof valve. The explosion-proof valve is provided at one end of the three-pole cover plate close to the negative pole column, and the liquid injection hole is provided at one end of the three-pole cover plate close to the positive pole column.

10. The active substance supplementing ion battery structure according to claim 9, characterized in that: The active substance supplementing ion battery structure further comprises a shell, which is arranged on the outside of the battery cell unit, and the three-pole cover is arranged on the end surface of one end of the shell.

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