Current collector for all-solid-state battery and all-solid-state battery

Abstract

The utility model discloses a current collector for an all-solid-state battery and the all-solid-state battery. The current collector can be arranged between two battery units; the current collector comprises a positive current collecting unit and a negative current collecting unit which are oppositely arranged, and an insulating supporting unit and a conductive unit are arranged between the positive current collecting unit and the negative current collecting unit; the insulation support unit is used for forming insulation isolation and support between the positive pole current collecting unit and the negative pole current collecting unit; the conductive unit is used for forming electric connection between the positive current collecting unit and the negative current collecting unit, and the conductive unit can be fused when the current flowing through the conductive unit exceeds a current threshold value. When the circuit is short-circuited, an open circuit is formed by fusing the conductive units, and effective support and insulation isolation are formed among the battery units by using the insulation support units when the conductive units are fused, so that the safety problem possibly caused by the short circuit of the internal-string all-solid-state battery is effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a current collector for all-solid-state batteries and an all-solid-state battery. Background Technology

[0002] With the development of lithium-ion batteries, they are gradually evolving from liquid to semi-solid and even all-solid state. All-solid-state batteries possess the characteristic of internal series connection, which is impossible for liquid and semi-solid-state batteries. However, research on all-solid-state batteries with internal series connection is still limited. Furthermore, due to the internal series structure, the overall battery voltage is very high; depending on the number of internal series connections, the battery voltage can reach tens of times that of conventional batteries. If a short circuit occurs, it will generate an extremely large current, posing a significant danger. Utility Model Content

[0003] The purpose of this invention is to provide a current collector and an all-solid-state battery for use in all-solid-state batteries, so as to solve the problem that there are significant safety hazards in all-solid-state batteries connected in series when a short circuit occurs.

[0004] This utility model is achieved through the following technical solution:

[0005] Current collectors for all-solid-state batteries, wherein the current collectors can be disposed between battery cells for series connection between battery cells;

[0006] The current collector includes a positive current collector unit and a negative current collector unit arranged opposite to each other, and an insulating support unit and a conductive unit are provided between the positive current collector unit and the negative current collector unit.

[0007] The insulating support unit is used to form insulation and support between the positive current collector unit and the negative current collector unit;

[0008] The conductive unit is used to form an electrical connection between the positive current collector and the negative current collector, and the conductive unit can be melted when the current flowing through the conductive unit exceeds the current threshold.

[0009] In some embodiments, the conductive unit includes a plurality of conductive elements, the two ends of which are respectively connected to a positive current collector and a negative current collector.

[0010] In some embodiments, the insulating support unit includes a plurality of insulating support members, the two ends of which are respectively connected to the positive current collector unit and the negative current collector unit.

[0011] On the other hand, this utility model also provides an all-solid-state battery, comprising:

[0012] Multiple battery cells are stacked sequentially.

[0013] And, the aforementioned current collector;

[0014] A current collector is provided between adjacent battery cells. The positive current collector is located on the positive electrode of the battery cell, and the negative current collector is located on the negative electrode of the adjacent battery cell.

[0015] In some embodiments, current collectors are respectively provided on the two outermost battery cells, and the positive current collector of one current collector is provided on the positive electrode of one battery cell, while the negative current collector of the other current collector is provided on the negative electrode of the other battery cell.

[0016] In some embodiments, the battery cell includes a positive electrode, an electrolyte membrane, and a negative electrode arranged sequentially.

[0017] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0018] This invention employs current collectors between stacked battery cells to form an internal series all-solid-state battery. This not only achieves the high-voltage characteristics of the internal series battery, but also, based on the structural characteristics of the current collectors, utilizes the melting of conductive units to create an open circuit when a short circuit occurs. Furthermore, when the conductive units melt, insulating support units provide effective support and insulation between the battery cells, thereby effectively solving the safety problems that may arise from short circuits in internal series all-solid-state batteries and improving the safety of all-solid-state batteries.

[0019] Based on the structural characteristics of the current collector, the prepared internal series all-solid-state battery has a simple structure and the preparation operation of the internal series all-solid-state battery is simple, which can effectively reduce the cost of all-solid-state batteries. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the current collector structure in an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the all-solid-state battery structure according to an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the first stacked structure prepared in the embodiment of this utility model.

[0024] Figure 4This is a schematic diagram of the second stacked structure prepared in an embodiment of the present invention.

[0025] in:

[0026] 10. Current collector; 11. Positive current collector unit; 12. Negative current collector unit; 13. Conductive component; 14. Insulating support component.

[0027] 20. Battery cell, 21. Positive electrode, 22. Electrolyte membrane, 23. Negative electrode. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0029] To solve the short-circuit problem in internal series solid-state batteries, this invention employs a current collector placed between adjacent battery cells in the internal series solid-state battery, connecting the battery cells in series via the current collector to form an internal series solid-state battery; see reference. Figure 1 The current collector 10 includes a positive current collector unit 11 and a negative current collector unit 12. The positive current collector unit 11 and the negative current collector unit 12 are arranged opposite to each other. An insulating support unit and a conductive unit are arranged between the positive current collector unit 11 and the negative current collector unit 12.

[0030] The insulating support unit is made of insulating material and is used to form insulation and support between the positive current collector unit and the negative current collector unit;

[0031] The conductive unit is used to form an electrical connection between the positive current collector and the negative current collector. When the current flowing through the conductive unit exceeds the current threshold, the conductive unit can be melted, breaking the electrical connection between the positive and negative current collectors. This effectively solves the safety problem caused by the large current generated when a short circuit occurs in the circuit.

[0032] like Figure 1 The conductive unit includes several conductive elements 13. The two ends of the conductive elements 13 are connected to the positive current collector unit and the negative current collector unit respectively. Multiple conductive elements form a multi-point connection between the positive current collector unit and the negative current collector unit, thereby realizing an effective connection between the positive current collector unit and the negative current collector unit.

[0033] The insulating support unit includes several insulating support members 14. The two ends of the insulating support members 14 are connected to the positive current collector unit and the negative current collector unit, respectively. Through multiple insulating support members, multi-point support is formed between the positive current collector unit and the negative current collector unit, so that when the conductive unit melts, the insulating support unit can form stable support and insulation isolation between the positive current collector unit and the negative current collector unit.

[0034] The conductive component 13 and the insulating support component 14 are evenly distributed on the positive current collector unit and the negative current collector unit; the conductive component 13 and the insulating support component 14 have a dot-shaped and columnar structure.

[0035] On the other hand, some embodiments of this utility model are all-solid-state batteries employing the current collectors described in the above embodiments, referring to... Figure 2 All-solid-state batteries include:

[0036] Multiple battery cells 20 are stacked sequentially to form an internal series all-solid-state battery; such as Figure 2 The battery cell 20 includes a positive electrode 21, an electrolyte membrane 22 and a negative electrode 23 arranged sequentially.

[0037] The battery cells 20 are connected in series via current collectors 10. The positive current collector 11 of the current collector is disposed on the positive electrode 21 of the battery cell, and the negative current collector 12 of the current collector is disposed on the negative electrode 23 of the adjacent battery cell. The adjacent battery cells 20 are connected in series via the current collectors.

[0038] When a short circuit occurs in the circuit, the internal resistance of the circuit drops instantly to near 0. At this time, under the high voltage of the internal solid-state battery, a large current is generated in the circuit. The large current will instantly melt the conductive unit. At this time, under the support of the insulating support unit, the positive current collector unit and the negative current collector unit are disconnected, so that the entire circuit forms an open circuit and cuts off the current, thereby preventing the safety problems caused by the short circuit.

[0039] In some embodiments, such as Figure 2 As shown, current collectors 10 are respectively provided on the two outermost battery cells 20, and the positive current collector of one current collector is provided on the positive electrode of one battery cell, while the negative current collector of the other current collector is provided on the negative electrode of the other battery cell.

[0040] Current collectors 10 are set at both ends of the internal series solid-state battery, and the positive current collector unit and the negative current collector unit of the current collector are used as the positive and negative electrodes of the solid-state battery.

[0041] The steps for preparing the all-solid-state battery in the above embodiments include:

[0042] The positive electrode of the battery cell is set on the surface of the positive current collector unit of the current collector, and the negative electrode of the battery cell is set on the surface of the negative current collector unit of the current collector.

[0043] An electrolyte film 22 is coated on the surface of the positive electrode 21 prepared above to form an electrolyte film 22. Figure 3 The first stack shown; or an electrolyte film 22 is coated on the surface of the negative electrode 23 prepared above to form Figure 4 The second stack shown;

[0044] The first or second stack is stacked sequentially, and current collectors are respectively placed on the battery cells located on both outer sides to prepare a battery as shown in the figure. Figure 2 The internal series solid-state battery shown.

[0045] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A current collector for all-solid-state batteries, characterized in that, The current collector can be disposed between battery cells for series connection between battery cells; The current collector includes a positive current collector unit and a negative current collector unit arranged opposite to each other, and an insulating support unit and a conductive unit are provided between the positive current collector unit and the negative current collector unit. The insulating support unit is used to form insulation and support between the positive current collector unit and the negative current collector unit; The conductive unit is used to form an electrical connection between the positive current collector and the negative current collector, and the conductive unit can be melted when the current flowing through the conductive unit exceeds the current threshold.

2. The current collector for all-solid-state batteries according to claim 1, characterized in that, The conductive unit includes several conductive elements, and the two ends of the conductive elements are respectively connected to the positive current collector unit and the negative current collector unit.

3. The current collector for all-solid-state batteries according to claim 1, characterized in that, The insulating support unit includes several insulating support members, and the two ends of the insulating support members are respectively connected to the positive current collector unit and the negative current collector unit.

4. An all-solid-state battery, characterized in that, include: Multiple battery cells are stacked sequentially. And, the current collector according to any one of claims 1-3; A current collector is provided between adjacent battery cells. The positive current collector is located on the positive electrode of the battery cell, and the negative current collector is located on the negative electrode of the adjacent battery cell.

5. The all-solid-state battery according to claim 4, characterized in that, The two outermost battery cells are each provided with a current collector, and the positive current collector of one current collector is located on the positive electrode of one battery cell, while the negative current collector of the other current collector is located on the negative electrode of the other battery cell.

6. The all-solid-state battery according to claim 4, characterized in that, The battery cell includes a positive electrode, an electrolyte membrane, and a negative electrode arranged in sequence.

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