Insulating frame and battery cell of multi-layer all-solid-state battery
By designing the insulating frame of a multi-layer all-solid state battery, filling the gaps around the positive electrode of the battery cell and reserve the position of the positive electrode ear, the problem of short-circuiting the battery cell under high pressure is solved, and the stability and life of the battery cell are improved.
Patent Information
- Application Number
- CN202421384370.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-05-20
- Estimated Expiration
- 2034-06-17
AI Technical Summary
When the all-solid state battery is pressed at high pressure, the gap around the positive electrode is compressed, and the edge of the negative electrode is close to the positive electrode ear, resulting in a short circuit inside the battery cell.
Design an insulated frame of a multi-layer all-solid state battery, including an annular frame and an ear pad. The annular frame fills the gap around the positive electrode, and the ear pad reserves the positive electrode position to avoid contact between the negative electrode edge and the positive electrode ear.
It effectively avoids the short circuit of the battery cell under high pressure, increases the stability and life of the battery cell, and maintains the overall consistency of the battery cell.
Smart Images
Figure CN222887909U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, and particularly relates to an insulating frame and an electric core of a multi-layer all-solid-state battery. Background Art
[0002] Compared with traditional liquid batteries, all-solid-state batteries have higher safety performance, longer lifespan and higher energy density, and are the most reliable substitutes for liquid batteries in terms of safety guarantee.
[0003] Since the contact mode between the positive and negative electrode materials and the electrolyte of the all-solid-state battery is solid-solid contact, its conductivity performance cannot be fully exerted under normal pressure, and high pressure needs to be applied to it to exert higher charge and discharge performance. In a process of the all-solid-state battery, the electrolyte of the electric core is compounded on the surface of the negative electrode of the electric core, and the area of the positive electrode of the electric core is smaller than the areas of the negative electrode and the electrolyte of the electric core (as Figure 1 shown). When the electric core is pressed under high pressure, the voids around the positive electrode of the electric core will be compressed, and the negative electrode and the electrolyte at the edge of the electric core will move closer to the voids. The negative electrode is subjected to a large shear force, resulting in fracture and contact with the positive electrode, leading to internal short circuit of the electric core. Summary of the Utility Model
[0004] The purpose of the utility model is to provide an insulating frame and an electric core of a multi-layer all-solid-state battery to solve one or more technical problems existing in the prior art, and at least provide a beneficial choice or create conditions.
[0005] The technical solution adopted to solve the above technical problems:
[0006] The utility model provides an insulating frame of a multi-layer all-solid-state battery, including an annular frame body. The frame edge is provided with an ear notch, and the ear notch is provided with an ear pad. The thickness of the ear pad is less than the thickness of the annular frame body. The ear pad extends outward from the annular frame body, and the inner end of the ear pad is flush with the inner border of the annular frame body.
[0007] The beneficial effect of the utility model is:
[0008] The insulating frame fills the voids around the positive electrode of the electric core and reserves a position for the positive electrode ear. The annular frame body effectively solves the problem that when the battery is pressed, the negative electrode edge and the positive electrode ear are pressed closer, resulting in short circuit of the electric core.
[0009] As a further improvement of the above technical solution, the annular frame body is in a double-square shape.
[0010] As a further improvement of the above technical solution, the ear pad and the annular frame body are of an integral structure.
[0011] As a further improvement of the above technical solution, the annular frame and the tab pads are made of single-layer insulating material and / or multi-layer insulating material.
[0012] The utility model provides an insulating frame for a multi-layer all-solid-state battery, including the insulating frame for a multi-layer all-solid-state battery described in any one of the above, a first electrode plate, and a second electrode plate. The number of the insulating frames is two, which are respectively a first insulating frame and a second insulating frame. Both the first insulating frame and the second insulating frame are sleeved on the edge of the second electrode plate. The sum of the thicknesses of the first insulating frame and the second insulating frame is equal to the thickness of the second electrode plate. The tab of the second electrode plate extends out from between the tab pads of the first insulating frame and the tab pads of the second insulating frame.
[0013] When the battery cell is subjected to high-pressure pressing, the gaps around the positive electrode of the battery cell are not easily broken due to the filling of the frame, reducing the occurrence of internal short circuit of the battery cell caused by the negative electrode and electrolyte of the battery cell approaching the gaps. Therefore, adding an insulating structure to the gaps around the positive electrode of the battery cell can prevent it from collapsing and short-circuiting, having a good protection effect, and also making the overall height of the battery cell consistent.
[0014] As a further improvement of the above technical solution, the first electrode plate further includes a negative current collector, a negative electrode material, and an electrolyte layer.
[0015] As a further improvement of the above technical solution, the second electrode plate further includes a positive current collector and a positive electrode material.
[0016] As a further improvement of the above technical solution, the negative current collector, the negative composite layer, the positive electrode material, the positive current collector, the positive electrode material, and the negative composite layer are stacked in sequence. The positive current collector forms the positive electrode tab, and the negative current collector forms the negative electrode tab.
[0017] As a further improvement of the above technical solution, the positive electrode tab is in contact with the two tab pads.
[0018] As a further improvement of the above technical solution, the outer frame of the insulating frame is flush with the first electrode plate, and the inner frame of the insulating frame is flush with the second electrode plate, better filling the gaps. Description of the Drawings
[0019] The following further describes the present utility model in conjunction with the drawings and embodiments;
[0020] Figure 1 is a schematic structural diagram of an existing battery cell provided by the present utility model;
[0021] Figure 2 is a schematic structural diagram of an embodiment of a battery cell provided by the present utility model
[0022] Figure 3 is a top view of an insulating frame of a multi-layer all-solid-state battery provided by the present utility model in one embodiment;
[0023] Figure 4 is a front view of an insulating frame of a multi-layer all-solid-state battery provided by the present utility model in one embodiment;
[0024] Figure 5 is Figure 3 a sectional view taken along line A-A in
[0025] Reference numerals:
[0026] First electrode sheet 100, negative electrode current collector 110, negative electrode composite layer 120, negative electrode tab 130, second electrode sheet 200, positive electrode tab 210, positive electrode current collector 220, positive electrode material 230, first insulating frame 310, second insulating frame 320, annular frame body 301, tab notch 302, tab pad 303. Detailed implementation manners
[0027] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The function of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it should not be construed as a limitation on the protection scope of the present utility model.
[0028] In the description of the present utility model, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present utility model.
[0029] In the description of the present utility model, if there are descriptions with words such as "several", its meaning is one or more, and the meaning of multiple is more than two. Understanding greater than, less than, exceeding, etc. does not include the present number, and understanding above, below, within, etc. includes the present number.
[0030] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installation, connection, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.
[0031] In a process of an all-solid-state battery, the electrolyte of the battery cell is on the surface of the negative electrode of the battery cell, and the area of the positive electrode of the battery cell is smaller than the areas of the negative electrode and the electrolyte of the battery cell (such as Figure 1As shown. When the battery cell is under high-pressure pressing, the voids around the positive electrode of the battery cell will be compressed, and the negative electrode and electrolyte at the edge of the battery cell will move closer to the voids. The negative electrode is subjected to a large shear force, resulting in fracture and contact with the positive electrode, leading to an internal short circuit of the battery cell. Therefore, referring to Figures 2 to 3 , an insulating frame and a battery cell of a multi-layer all-solid-state battery of the present invention are provided, and the following embodiments are made:
[0032] In some embodiments, referring to Figure 3 , Figure 4 , Figure 5 , the insulating frame includes an annular frame body 301. The annular frame body 301 is in a zigzag shape. A tab notch 302 is provided on the left frame edge of the insulating frame. A tab pad 303 is provided in the tab notch 302. The positive tab 210 is disposed on the tab pad 303. In an actual battery cell, two annular frame bodies 301 are stacked around the second electrode plate 200, and the positive tab 210 extends out from the interval formed by the two tab pads 303.
[0033] The tab pad 303 and the annular frame body 301 make the entire insulating frame in the shape of "Jia" or "You". In some other embodiments, a tab notch 302 is also provided on the right frame edge of the insulating frame and a tab pad 303 is provided in the same way as on the left side. At this time, the tab pad 303 and the annular frame body 301 make the entire insulating frame in the shape of "Shen". The position of the tab pad 303 can be adjusted according to the position of the positive tab 210 of the second electrode plate 200, and the present invention does not make specific limitations. For example, in the present invention, if the positive tab 210 of the second electrode plate 200 is located in the middle of the edge of the second electrode plate 200, then the tab pad 303 is also correspondingly disposed in the middle of the frame edge of the annular frame body 301 corresponding to the positive tab 210 of the second electrode plate 200; if the positive tab 210 of the second electrode plate 200 is located at a position to the left of the edge of the second electrode plate 200, then the tab pad 303 is also correspondingly disposed at a position to the left of the frame edge of the annular frame body 301 corresponding to the positive tab 210 of the second electrode plate 200; if the positive tab 210 of the second electrode plate 200 is located at a position to the right of the edge of the second electrode plate 200, then the tab pad 303 is also correspondingly disposed at a position to the right of the frame edge of the annular frame body 301 corresponding to the positive tab 210 of the second electrode plate 200.
[0034] In some other embodiments, the annular frame body 301 can also be in other shapes such as a circular ring, specifically matching the shape of the second electrode plate 200. For example, if the second electrode plate 200 is rectangular, then the inner and outer frames of the annular frame body 301 are also approximately rectangular; if the second electrode plate 200 is circular, then the inner and outer frames of the annular frame body 301 are also approximately circular, and those skilled in the art can make specific settings according to the actual situation.
[0035] The thickness of the tab pad 303 is less than that of the annular frame 301. The tab pad 303 extends outward from the annular frame 301, and the extended part of the tab pad 303 blocks the problem of the positive tab 210 contacting the negative electrode edge.
[0036] One end of the tab pad 303 extending into the tab notch 302 is flush with the inner border of the annular frame 301, so that the tab pad 303 does not affect the setting of the second electrode plate 200, and at the same time, it is ensured that the edge of the second electrode plate 200 is closely attached to the inner border of the annular frame 301. The shape of the tab pad 303 can be set into other shapes such as square or semi-elliptical, and it is specifically adjusted according to the shape of the tab.
[0037] Among them, the tab pad 303 and the annular frame 301 can both be the same single-layer insulating material, and the thickness of the part of the positive tab 210 is thinner than that of other part surfaces; or the annular frame 301 can be a multi-layer insulating material, and the number of insulating material layers of the part of the positive tab 210 is one layer or multiple layers less than that of other parts of the insulating material. In addition to being an insulating material, the insulating frame preferably has the same compressive strength and shear strength as the material of the second electrode plate 200, so as to deform approximately the same when pressurized and have a better protection effect.
[0038] The tab pad 303 and the annular frame 301 are of an integral structure. In some other embodiments, the tab pad 303 and the annular frame 301 can also be a combined structure of a split structure.
[0039] Both the positive second electrode plate 200 and the negative second electrode plate 200 can be provided with insulating frames. When in use, the insulating frame provided for the negative second electrode plate 200 is symmetrically flipped along the central plane of the negative second electrode plate 200 relative to the insulating frame provided for the negative second electrode plate 200.
[0040] This insulating frame fills the gap around the positive electrode of the battery cell and reserves a position for the positive tab 210. The annular frame 301 effectively avoids the problem that the negative electrode edge and the positive tab 210 approach each other under pressure during battery pressing, resulting in a short circuit of the battery cell. Specifically Figure 2 at A in it can also solve the problem that the negative second electrode plate 200 breaks due to a large shear force caused by the area of the positive electrode of the battery cell being smaller than the areas of the negative electrode and the electrolyte of the battery cell.
[0041] Refer to Figure 2, the present utility model also provides an embodiment of an electric core, which includes an insulating frame of a multi-layer all-solid-state battery, a first electrode sheet 100, and a second electrode sheet 200 described in any one of the above. The number of insulating frames is two, which are a first insulating frame 310 and a second insulating frame 320 respectively. The first insulating frame 310 and the second insulating frame 320 have the same structure. When in use, the second insulating frame 320 is flipped relative to the first insulating frame 310.
[0042] Both the first insulating frame 310 and the second insulating frame 320 are sleeved on the edge of the second electrode sheet 200. The sum of the thicknesses of the first insulating frame 310 and the second insulating frame 320 is equal to the thickness of the second electrode sheet 200. The positive electrode tab 210 of the second electrode sheet 200 extends out from between the tab pads 303 of the first insulating frame 310 and the tab pads 303 of the second insulating frame 320.
[0043] The first electrode sheet 100 further includes a negative electrode current collector 110 and a negative electrode composite layer 120. The negative electrode composite layer 120 is made by winding a negative electrode material and an electrolyte layer together.
[0044] The negative electrode composite layer 120 is made by winding a negative electrode material and an electrolyte layer together. The second electrode sheet 200 further includes a positive electrode current collector 220 and a positive electrode material 230.
[0045] The negative electrode current collector 110, the negative electrode composite layer 120, the positive electrode material 230, the positive electrode current collector 220, the positive electrode material 230, and the negative electrode composite layer 120 are stacked in sequence. The positive electrode current collector 220 forms the positive electrode tab 210, and the negative electrode current collector 110 forms the negative electrode tab 130.
[0046] The positive electrode tab 210 is attached to the two tab pads 303, playing a role of isolating the positive electrode tab 210 to a certain extent.
[0047] The outer edge of the first electrode sheet 100 is flush with the outer frame of the insulating frame, and the inner frame of the insulating frame is flush with the second electrode sheet 200, better filling the gap and playing a better insulating and protecting role.
[0048] When the electric core is subjected to high-pressure pressing, the gaps around the positive electrode of the electric core are not easily broken due to the filling of the frame, reducing the occurrence of internal short circuit of the electric core caused by the negative electrode and electrolyte of the electric core approaching the gaps. Therefore, adding an insulating structure to the gaps around the positive electrode of the electric core can prevent it from collapsing and short-circuiting, playing a better protective role, and also making the overall height of the electric core consistent, facilitating assembly.
[0049] The preferred embodiments of the present utility model have been specifically described above. However, the present invention is not limited to the embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present utility model. These equivalent variations or substitutions are all included within the scope defined by the claims of this application.
Claims
1. An insulating frame for a multi-layer all-solid-state battery, characterized in that: Comprising: A ring-shaped frame body, with a tab notch provided on its frame edge, a tab pad provided in the tab notch, the thickness of the tab pad being less than that of the ring-shaped frame body, the tab pad extending outwardly from the ring-shaped frame body, and the inner end of the tab pad being flush with the inner frame of the ring-shaped frame body.
2. The insulating frame of a multi-layer all-solid-state battery according to claim 1, characterized in that: The ring-shaped frame body is in a figure-eight shape.
3. The insulating frame of a multi-layer all-solid-state battery according to claim 1, characterized in that: The tab pad and the ring-shaped frame body are of an integral structure.
4. The insulating frame of a multi-layer all-solid-state battery according to claim 1, characterized in that: The ring-shaped frame body and the tab pad are made of single-layer insulating material and / or multi-layer insulating material.
5. A battery cell, characterized in that: Comprising an insulating frame, a first electrode tab, and a second electrode tab of a multi-layer all-solid-state battery according to any one of claims 1 to 4, wherein the number of the insulating frames is two, the two insulating frames are respectively a first insulating frame and a second insulating frame, both the first insulating frame and the second insulating frame are sleeved on the edge of the second electrode tab, the sum of the thicknesses of the first insulating frame and the second insulating frame is equal to the thickness of the second electrode tab, and the positive tab of the second electrode tab extends out from between the tab pads of the first insulating frame and the second insulating frame.
6. A battery cell according to claim 5, characterized in that: The first electrode tab further comprises a negative current collector, and a negative composite layer formed by winding a negative electrode material and an electrolyte layer together.
7. A battery cell according to claim 6, characterized in that: The second electrode tab further comprises a positive current collector and a positive electrode material.
8. A battery cell according to claim 7, characterized in that: The negative current collector, the negative composite layer, the positive electrode material, the positive current collector, the positive electrode material, and the negative composite layer are stacked in sequence, the positive current collector forms the positive tab, and the negative current collector forms the negative tab.
9. A battery cell according to claim 5, characterized in that: The positive tab is in contact with the two tab pads.
10. A battery cell according to claim 5, characterized in that: The outer frame of the insulating frame is flush with the first electrode tab, and the inner frame of the insulating frame is flush with the second electrode tab.