A sodium-ion battery cell

Abstract

The utility model relates to battery cell technical field, concretely is a kind of sodium ion battery cell, including upper layer cell and lower layer cell, cell diaphragm is arranged between upper layer cell and lower layer cell, upper layer cell and lower layer cell all include positive plate and negative plate and the inner diaphragm being arranged between positive plate and negative plate, positive tab is formed on positive plate, negative tab is formed on negative plate, positive tab and positive tab between and negative tab and negative tab between all are arranged with conductive pole layer, by the setting of conductive pole layer, the positive tab is communicated simultaneously, avoid bending to positive tab and negative tab, reduce the possibility that pole ear appears fracture, to improve the yield of production, by the setting of outer conductive layer, bending etc. Operation is carried out using outer conductive layer, to adapt and connect different shell.

Description

Technical Field

[0001] This utility model relates to the field of battery cell technology, specifically to a sodium-ion battery cell. Background Technology

[0002] CN222126635U discloses a composite electrode unit and a battery cell. The composite electrode unit is formed by stacking multiple electrode layers. The electrode includes: a lithium-ion positive electrode; a sodium-ion positive electrode, with the lithium-ion positive electrode and sodium-ion positive electrode alternating along the stacking direction; and a negative electrode disposed between adjacent lithium-ion positive electrode and sodium-ion positive electrode. This invention utilizes the heat generated by the sodium-ion positive electrode during charging and discharging to heat the lithium-ion positive electrode until the temperature meets the operating requirements of the lithium-ion positive electrode.

[0003] However, during the production of the aforementioned composite electrode unit, since there are several positive and negative tabs, the positive tabs need to be bent, welded, and wrapped with tape to fix them together. Furthermore, the battery cell needs to be bent again during use to adapt to the casing. Repeated bending of the tabs can easily lead to breakage. Also, since the tabs and the electrode are integrated, the electrode will be damaged simultaneously, thus damaging the battery cell. Utility Model Content

[0004] The purpose of this invention is to provide a sodium-ion battery cell to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A sodium-ion battery cell, comprising: A battery cell unit is formed by stacking layers and a battery cell separator is located between two adjacent battery cell units. The battery cell unit includes an upper battery cell and a lower battery cell, and the battery cell separator is sandwiched between the upper battery cell and the lower battery cell. Both the upper and lower battery cells include a positive electrode plate and a negative electrode plate, as well as an inner separator sandwiched between the positive and negative electrode plates. A positive electrode tab is formed on the positive electrode sheet, and a negative electrode tab is formed on the negative electrode sheet. Conductive electrode layers are sandwiched between adjacent positive electrode tabs and between adjacent negative electrode tabs.

[0006] Preferably, the conductive electrode layer includes an ECA conductive layer one and an ECA conductive layer two sandwiched between the two positive electrodes or between the two negative electrodes.

[0007] Preferably, the conductive electrode layer further includes conductive positioning holes formed on both the positive and negative electrode tabs and conductive positioning pins penetrating the conductive positioning holes.

[0008] Preferably, the first ECA conductive layer and the second ECA conductive layer encapsulate the conductive positioning needle.

[0009] Preferably, an outer conductive layer is sandwiched between the first ECA conductive layer and the second ECA conductive layer, and the outer conductive layer is sleeved on the conductive positioning pin.

[0010] Preferably, the outer conductive layer extends from between the first ECA conductive layer and the second ECA conductive layer to form a conductive connector.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This invention connects the positive electrode tabs by setting a conductive electrode layer, while avoiding bending the positive and negative electrode tabs, reducing the possibility of tab breakage and thus improving the production yield. By setting an outer conductive layer, bending and other operations can be performed using the outer conductive layer and conductive connectors to adapt to and connect different battery casings. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the battery cell unit of this utility model; Figure 2 This is a schematic diagram of the conductive positioning pin of this utility model; Figure 3 This is a schematic diagram of the upper battery cell structure of this utility model.

[0013] In the diagram: 1. Upper cell; 2. Lower cell; 3. Cell separator; 4. Positive electrode; 5. Negative electrode; 6. Inner separator; 7. Positive tab; 8. Negative tab; 9. Conductive positioning hole; 10. Conductive positioning pin; 11. ECA conductive layer one; 12. ECA conductive layer two; 13. Outer conductive layer; 14. Conductive connector. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figures 1 to 3 This utility model provides a technical solution: A sodium-ion battery cell, comprising: The battery cell unit is formed by stacking layers and the battery cell separator is located between two adjacent battery cell units. The battery cell unit includes an upper battery cell 1 and a lower battery cell 2. A battery cell separator 3 is sandwiched between the upper battery cell 1 and the lower battery cell 2. Several layers can be stacked in sequence according to this structure. The battery cell separator 3 can be a film made of materials such as PP / PE. The battery cell separator 3 is used to separate the upper battery cell 1 and the lower battery cell 2.

[0016] Both the upper cell 1 and the lower cell 2 include a positive electrode 4 and a negative electrode 5, as well as an inner separator 6 sandwiched between the positive electrode 4 and the negative electrode 5. The positive electrode 4 is formed by coating and rolling a positive electrode material such as Prussian blue onto an aluminum foil. The negative electrode 5 is formed by coating and rolling a negative electrode material such as amorphous carbon onto an aluminum foil. The inner separator 6 can be a thin film made of materials such as PP / PE.

[0017] A positive electrode tab 7 is formed on the positive electrode plate 4. The positive electrode tab 7 is fixedly connected to the positive electrode plate 4 by means of integral cutting and molding. A negative electrode tab 8 is formed on the negative electrode plate 5. The negative electrode tab 8 is fixedly connected to the negative electrode plate 5 by means of integral cutting and molding. Conductive electrode sheets are sandwiched between adjacent positive electrode tabs 7 and between adjacent negative electrode tabs 8.

[0018] The conductive electrode layer includes conductive positioning holes 9, conductive positioning pins 10, ECA conductive layer one 11, ECA conductive layer two 12, outer conductive layer 13, and conductive connectors 14. Conductive positioning holes 9 are provided on both the positive electrode tab 7 and the negative electrode tab 8. The conductive positioning pins 10 are inserted into the conductive positioning holes 9 and are fixedly connected to the positive electrode tab 7 or the negative electrode tab 8 by soldering or ECA conductive adhesive. The conductive positioning pins 10 penetrate all the positive electrode tabs 7 or the negative electrode tabs 8 of several battery cells. ECA conductive layer one 11 and ECA conductive layer two 12 are provided between two positive electrode tabs 7 and between two negative electrode tabs 8, and they enclose the conductive positioning pins 10. 12 are all made of epoxy conductive adhesive, but other conductive adhesives can also be used. The outer conductive layer 13 is sandwiched between the first ECA conductive layer 11 and the second ECA conductive layer 12 and is sleeved on the conductive positioning pin 10. The outer conductive layer 13 is made of copper foil, which gives it better ductility, makes it less prone to breakage, and has a higher melting point, allowing for more complex welding operations and improving connection stability. The portion of the outer conductive layer 13 that extends beyond the first ECA conductive layer 11 and the second ECA conductive layer 12 forms a conductive connector 14. The conductive connector 14 can be used for bending and other operations to adapt to and connect different shells. The setting of the conductive positioning pin 10 improves the conductivity between the tabs and the docking accuracy of the electrode sheets, reducing the docking difficulty.

[0019] Working principle: When in use, the positive electrode 7 is connected by the conductive electrode sheet, while avoiding bending the positive electrode 7 and the negative electrode 8. The conductive connector 14 is used for bending, welding and other operations to adapt to and connect different battery shells.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sodium-ion battery cell, characterized in that, include: A battery cell unit is formed by stacking layers and a battery cell separator is located between two adjacent battery cell units. The battery cell unit includes an upper battery cell and a lower battery cell, and the battery cell separator is sandwiched between the upper battery cell and the lower battery cell. Both the upper and lower battery cells include a positive electrode plate and a negative electrode plate, as well as an inner separator sandwiched between the positive and negative electrode plates. A positive electrode tab is formed on the positive electrode sheet, and a negative electrode tab is formed on the negative electrode sheet. Conductive electrode layers are sandwiched between adjacent positive electrode tabs and between adjacent negative electrode tabs.

2. The sodium-ion battery cell according to claim 1, characterized in that: The conductive electrode layer includes an ECA conductive layer one and an ECA conductive layer two sandwiched between the two positive electrodes or between the two negative electrodes.

3. A sodium-ion battery cell according to claim 2, characterized in that: The conductive electrode sheet also includes conductive positioning holes formed on both the positive and negative tabs, and conductive positioning pins penetrating the conductive positioning holes.

4. A sodium-ion battery cell according to claim 3, characterized in that: The ECA conductive layer one and ECA conductive layer two encapsulate the conductive positioning needle.

5. A sodium-ion battery cell according to claim 4, characterized in that: An outer conductive layer is sandwiched between the first ECA conductive layer and the second ECA conductive layer, and the outer conductive layer is sleeved on the conductive positioning pin.

6. A sodium-ion battery cell according to claim 5, characterized in that: The outer conductive layer extends from between the first ECA conductive layer and the second ECA conductive layer to form a conductive connector.

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