Negative electrode aluminum foil assembly and sodium ion battery

Abstract

The utility model provides a negative electrode aluminum foil assembly and a sodium ion battery. The negative electrode aluminum foil assembly is used for being connected to one end of a battery cell and comprises a coating part and an empty foil part, the coating part is connected with the empty foil part, the coating part is provided with a sodium embedding layer, the empty foil part is provided with a marking body, the marking body comprises a conductive layer and a weld-aid layer which are stacked, the conductive layer is connected with the empty foil part, and the weld-aid layer is connected with the coating part. The conductive layer and the weld-aid layer are both abutted against the sodium-embedded layer. According to the negative electrode aluminum foil assembly, the use safety of the sodium ion battery is relatively good.

Description

Technical Field

[0001] The present disclosure relates to the technical field of sodium ion batteries, and in particular to a negative electrode aluminum foil assembly and a sodium ion battery. Background Art

[0002] Sodium-ion batteries are secondary batteries that rely on the movement of sodium ions between positive and negative electrodes to charge and discharge. They are widely used in electric vehicles, electronic devices, aerospace, energy storage systems, and smart grids. Sodium-ion batteries consist of a cell and a casing, with the cell and casing connected.

[0003] The sodium ion battery of the related technology includes a positive electrode sheet, a negative electrode sheet, a diaphragm and a shell. The diaphragm is arranged between the positive electrode sheet and the negative electrode sheet so that the positive electrode sheet, the negative electrode sheet and the diaphragm are wound together to form a battery cell. The battery cell is assembled in the shell. The positive electrode sheet and the negative electrode sheet are both aluminum foil structures, such as the Chinese patent number CN201710442457.1.

[0004] However, since both the positive and negative electrode sheets are made of aluminum foil, it is difficult to distinguish the positive and negative electrodes at both ends of the battery cell after winding, which makes it easy to confuse the positive and negative electrodes at both ends of the battery cell. As a result, workers are more likely to put the positive and negative electrodes at both ends of the battery cell in reverse when assembling the sodium-ion battery, which makes it easier for the sodium-ion battery to be over-discharged during formation, thereby making the sodium-ion battery less safe to use. Utility Model Content

[0005] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a negative electrode aluminum foil assembly and a sodium ion battery that improve the safety of sodium ion batteries.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] A negative aluminum foil assembly is used to be connected to one end of a battery cell. The negative aluminum foil assembly includes a coating portion and a hollow foil portion. The coating portion is connected to the hollow foil portion. The coating portion is provided with a sodium-embedded layer. The hollow foil portion is provided with a marking body. The marking body includes a stacked conductive layer and a soldering layer. The conductive layer is connected to the hollow foil portion. Both the conductive layer and the soldering layer abut against the sodium-embedded layer.

[0008] In one embodiment, the number of the hollow foil portions is two, and the two hollow foil portions are axially symmetrically distributed about the central axis of the coating portion.

[0009] In one embodiment, the coating portion and the hollow foil portion are an integrally formed structure.

[0010] In one embodiment, the conductive layer is bonded to the hollow foil portion.

[0011] In one embodiment, a connecting adhesive layer is provided at the connection between the conductive layer and the hollow foil portion.

[0012] In one embodiment, the conductive layer is a polycarbonate conductive film layer, a polypropylene conductive film layer, or a polyimide conductive film layer.

[0013] In one embodiment, the conductive layer is an integrally formed structure.

[0014] In one embodiment, the soldering layer is an integrally formed structure.

[0015] In one embodiment, the sodium embedded layer is a carbon-based structural layer.

[0016] A sodium ion battery comprises the negative electrode aluminum foil assembly described in any one of the above embodiments.

[0017] Compared with the prior art, the present disclosure has at least the following advantages:

[0018] Since the negative electrode aluminum foil assembly is used to be connected to one end of the battery cell, the other end of the battery cell is connected to the positive electrode aluminum foil sheet. The empty foil portion of the negative electrode aluminum foil assembly is provided with a marking body, so that the staff can identify the negative end on the battery cell through the marking body, so that the staff can easily distinguish the positive and negative electrodes at both ends of the battery cell under the action of the marking body, so that the positive and negative electrodes at both ends of the battery cell formed after winding are easier to distinguish under the action of the marking body, thereby solving the problem of easy confusion of the positive and negative electrodes at both ends of the battery cell in the prior art, so that the staff can clearly distinguish the positive and negative electrodes at both ends of the battery cell under the action of the marking body, making it difficult for the staff to put the positive and negative electrodes at both ends of the battery cell upside down when assembling the sodium ion battery, thereby avoiding the problem of battery over-discharge that is easy to occur during the formation of the sodium ion battery in the prior art, thereby making the sodium ion battery safer to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic structural diagram of a negative electrode aluminum foil assembly according to an embodiment;

[0021] Figure 2 for Figure 1 A schematic structural diagram of the negative electrode aluminum foil assembly from another perspective is shown;

[0022] Figure 3 for Figure 1 A schematic structural diagram of the negative electrode aluminum foil assembly from one perspective is shown. DETAILED DESCRIPTION

[0023] To facilitate understanding of the present disclosure, a more comprehensive description of the present disclosure will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present disclosure. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. The terms used herein in the specification of this disclosure are intended only to describe specific embodiments and are not intended to limit this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] The present disclosure provides a negative electrode aluminum foil assembly for connecting to one end of a battery cell.

[0027] Furthermore, the negative electrode aluminum foil assembly includes a coating portion and a hollow foil portion, the coating portion is connected to the hollow foil portion, the coating portion is provided with a sodium-embedded layer, the hollow foil portion is provided with a marking body, the marking body includes a stacked conductive layer and a soldering layer, the conductive layer is connected to the hollow foil portion, and the conductive layer and the soldering layer are both in contact with the sodium-embedded layer.

[0028] The above-mentioned negative electrode aluminum foil assembly is used to connect to one end of the battery cell, so that the other end of the battery cell is connected to the positive electrode aluminum foil sheet. The empty foil portion of the negative electrode aluminum foil assembly is provided with a marking body, so that the staff can identify the negative end on the battery cell through the marking body, so that the staff can easily distinguish the positive and negative electrodes at both ends of the battery cell under the action of the marking body, so that the positive and negative electrodes at both ends of the battery cell formed after winding are easier to distinguish under the action of the marking body, thereby solving the problem of easy confusion of the positive and negative electrodes at both ends of the battery cell in the prior art, so that the staff can clearly distinguish the positive and negative electrodes at both ends of the battery cell under the action of the marking body, making it difficult for the staff to reverse the positive and negative electrodes at both ends of the battery cell when assembling the sodium ion battery, thereby avoiding the problem of battery over-discharge that is easy to occur during the formation of the sodium ion battery in the prior art, thereby making the sodium ion battery safer to use.

[0029] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure is further described in detail below with reference to specific embodiments:

[0030] like Figures 1 to 3 As shown, the negative electrode aluminum foil assembly 10 of one embodiment is used to be connected to one end of the battery cell.

[0031] Furthermore, the negative electrode aluminum foil assembly 10 includes a coating portion 100 and a hollow foil portion 200, the coating portion 100 is connected to the hollow foil portion 200, the coating portion 100 is provided with a sodium-embedded layer 110, and the hollow foil portion 200 is provided with a marking body 210, the marking body 210 includes a stacked conductive layer 211 and a soldering layer 212, the conductive layer 211 is connected to the hollow foil portion 200, and the conductive layer 211 and the soldering layer 212 are both in contact with the sodium-embedded layer 110.

[0032] In this embodiment, the negative electrode aluminum foil assembly 10 is used to be connected to one end of the battery cell, so that the other end of the battery cell is connected to the positive electrode aluminum foil.

[0033] The above-mentioned negative electrode aluminum foil assembly 10 is used to connect to one end of the battery cell, so that the other end of the battery cell is connected to the positive electrode aluminum foil sheet. The empty foil portion 200 of the negative electrode aluminum foil assembly 10 is provided with a marking body 210, so that the staff can identify the negative end on the battery cell through the marking body 210, so that the staff can easily distinguish the positive and negative electrodes at both ends of the battery cell under the action of the marking body 210, so that the positive and negative electrodes at both ends of the battery cell formed after winding are easier to distinguish under the action of the marking body 210, thereby solving the problem of easy confusion of the positive and negative electrodes at both ends of the battery cell in the prior art, so that the staff can clearly distinguish the positive and negative electrodes at both ends of the battery cell under the action of the marking body 210, making it difficult for the staff to reverse the positive and negative electrodes at both ends of the battery cell when assembling the sodium ion battery, thereby avoiding the problem of battery over-discharge that is easy to occur during the formation of the sodium ion battery in the prior art, thereby improving the safety of the sodium ion battery.

[0034] like Figure 1 and Figure 3 As shown, in one embodiment, there are two hollow foil portions 200, which are symmetrically distributed about the central axis of the coating portion 100. In this embodiment, increasing the number of hollow foil portions 200 increases the number of marking bodies 210, making the marking on the negative electrode aluminum foil assembly 10 more obvious, improving the recognition of the negative electrode aluminum foil assembly 10 by staff, and thus improving the safety of the sodium ion battery.

[0035] In one embodiment, the coating portion 100 and the hollow foil portion 200 are integrally formed, so that the connection strength between the coating portion 100 and the hollow foil portion 200 is high, thereby improving the structural stability of the negative electrode aluminum foil assembly 10 .

[0036] like Figures 1 to 3 As shown, in one embodiment, the conductive layer 211 is bonded to the hollow foil portion 200 , which is beneficial to the connection between the conductive layer 211 and the hollow foil portion 200 , making the connection between the conductive layer 211 and the hollow foil portion 200 more convenient.

[0037] like Figures 1 to 3 As shown, in one embodiment, a connection adhesive layer 2111 is provided at the connection between the conductive layer 211 and the hollow foil portion 200 , which further improves the connection convenience between the conductive layer 211 and the hollow foil portion 200 .

[0038] In one embodiment, the conductive layer 211 is a polycarbonate conductive film layer, a polypropylene conductive film layer, or a polyimide conductive film layer, so that the conductive layer 211 has better conductivity.

[0039] In one embodiment, the conductive layer 211 is an integrally formed structure, so that the structural strength of the conductive layer 211 is higher.

[0040] In one embodiment, the soldering layer 212 is an integrally formed structure, so that the soldering layer 212 has a higher structural strength.

[0041] In one embodiment, the sodium intercalation layer 110 is a carbon-based structural layer, so that the sodium intercalation layer 110 can effectively intercalate or deintercalate sodium ions, thereby making the sodium intercalation layer 110 have better conductivity.

[0042] The present disclosure also provides a sodium ion battery, comprising the negative electrode aluminum foil assembly 10 of any of the above embodiments.

[0043] Compared with the prior art, the present disclosure has at least the following advantages:

[0044] Since the negative electrode aluminum foil assembly 10 is used to be connected to one end of the battery cell, so that the other end of the battery cell is connected to the positive electrode aluminum foil sheet, the empty foil portion 200 of the negative electrode aluminum foil assembly 10 is provided with a marking body 210, so that the staff can identify the negative end on the battery cell through the marking body 210, so that the staff can easily distinguish the positive and negative electrodes at both ends of the battery cell under the action of the marking body 210, so that the positive and negative electrodes at both ends of the battery cell formed after winding are easier to distinguish under the action of the marking body 210, thereby solving the problem of easy confusion of the positive and negative electrodes at both ends of the battery cell in the prior art, so that the staff can clearly distinguish the positive and negative electrodes at both ends of the battery cell under the action of the marking body 210, making it difficult for the staff to reverse the positive and negative electrodes at both ends of the battery cell when assembling the sodium ion battery, thereby avoiding the problem of battery over-discharge that is easy to occur during the formation of the sodium ion battery in the prior art, thereby improving the safety of the sodium ion battery.

[0045] The above-described embodiments merely represent several implementation methods of the present disclosure. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the disclosed patent shall be determined by the appended claims.

Claims

1. A negative electrode aluminum foil assembly, used to connect to one end of a battery cell, characterized in that: The negative electrode aluminum foil assembly includes a coating portion and a hollow foil portion, the coating portion is connected to the hollow foil portion, the coating portion is provided with a sodium-embedded layer, the hollow foil portion is provided with a marking body, the marking body includes a stacked conductive layer and a soldering layer, the conductive layer is connected to the hollow foil portion, and the conductive layer and the soldering layer are both in contact with the sodium-embedded layer.

2. The negative electrode aluminum foil assembly according to claim 1, characterized in that: The number of the empty foil portions is two, and the two empty foil portions are axially symmetrically distributed about the central axis of the coating portion.

3. The negative electrode aluminum foil assembly according to claim 1, characterized in that: The coating portion and the hollow foil portion are an integrally formed structure.

4. The negative electrode aluminum foil assembly according to claim 1, characterized in that: The conductive layer is bonded to the hollow foil portion.

5. The negative electrode aluminum foil assembly according to claim 4, characterized in that: A connecting adhesive layer is provided at the connection between the conductive layer and the hollow foil portion.

6. The negative electrode aluminum foil assembly according to claim 1, characterized in that: The conductive layer is a polycarbonate conductive film layer, a polypropylene conductive film layer, or a polyimide conductive film layer.

7. The negative electrode aluminum foil assembly according to claim 1, characterized in that: The conductive layer is an integrally formed structure.

8. The negative electrode aluminum foil assembly according to claim 1, characterized in that: The soldering layer is an integrally formed structure.

9. The negative electrode aluminum foil assembly according to claim 1, characterized in that: The sodium embedded layer is a carbon-based structural layer.

10. A sodium ion battery, characterized in that: A negative electrode aluminum foil assembly comprising the negative electrode aluminum foil assembly according to any one of claims 1 to 9.

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