Solid-state batteries and battery packs
By incorporating a protective film within the solid-state battery, the problems of damage and adhesion of the packaging bag under pressure are resolved, ensuring the integrity and safety of the battery and achieving reliable battery protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CALB (JIANGSU) CO LTD
- Filing Date
- 2025-07-17
- Publication Date
- 2026-07-07
AI Technical Summary
During the production of solid-state batteries, the packaging bag is prone to breakage when pressurized, causing the pressurizing device to come into direct contact with the battery cell, resulting in contamination or damage. Furthermore, the broken packaging bag may become embedded in the battery cell, affecting battery performance. When peeling it off, it may also stick to the electrode sheets, causing a short circuit.
A protective film is placed in the solid-state battery, covering both sides of the cell and extending beyond the cell. The protective film is pressurized together with the cell to prevent direct contact with the cell when the packaging bag is damaged. It can also be easily peeled off after being pressurized to avoid adhesion. At the same time, it shrinks at high temperature but still covers the cell, blocking burrs and providing insulation and flame retardant protection.
The protective film protects the cell integrity during pressurization, prevents the packaging bag from breaking and sticking, ensures battery safety and performance, and avoids forming an insulation and flame-retardant barrier after the outer casing is damaged.
Smart Images
Figure CN224472537U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of batteries, and specifically proposes a solid-state battery and a battery pack. Background Technology
[0002] Solid-state batteries use solid electrolytes, which have higher energy density, better safety, and longer cycle life compared to traditional batteries containing liquid electrolytes.
[0003] In actual production, solid-state batteries require significant pressure to ensure a tight bond between the solid electrolyte and the electrode plates. Specifically, the solid-state cells are typically placed in a packaging bag, which is then evacuated and sealed. The bag and solid-state cells are then pressurized together, and the bag is removed before subsequent casing is applied.
[0004] However, the pressure required to apply to solid-state cells is relatively high, which may damage the packaging bag, causing the pressurizing device to come into direct contact with the solid-state cells and contaminating or damaging them. Furthermore, the damaged packaging bag may become embedded inside the solid-state cells, affecting battery performance. In addition, when the packaging bag is peeled off after pressurization, it may stick to the electrode plates inside the solid-state cells, causing cell damage and short circuits. Utility Model Content
[0005] The purpose of this application is to solve at least some of the technical problems mentioned above, and this purpose is achieved through the following technical solutions:
[0006] This application proposes a solid-state battery, which includes a solid-state cell and a protective film. The solid-state cell has a first direction, a second direction, and a third direction that are perpendicular to each other; the protective film is disposed on the outside of the solid-state cell and covers at least two opposite sides of the solid-state cell along the third direction, and the protective film extends beyond the solid-state cell along both the first and second directions.
[0007] The technical solution proposed in this application has at least the following technical effects:
[0008] In this application, a protective film is provided on the outside of the solid-state battery cell. The solid-state battery cell and the protective film can be placed together in a packaging bag for pressurization. If the packaging bag is damaged, the protective film provides further protection, preventing the pressurization device from directly contacting the solid-state battery cell and also preventing the damaged packaging bag from embedding inside the solid-state battery cell. Moreover, after pressurization, due to the isolation effect of the protective film, the packaging bag can be easily peeled off without sticking to the solid-state battery cell, thus ensuring the integrity of the solid-state battery cell. Furthermore, the protective film covers at least two sides of the solid-state battery cell that are subjected to pressure and extends beyond the solid-state battery cell. When affected by temperature during pressurization, the protective film can still maintain coverage of the solid-state battery cell even if it shrinks. In addition, the protective film can also block burrs inside the solid-state battery cell, preventing burrs from piercing the outer casing. And in the event of accidental damage to the outer casing, the protective film can also form a reliable insulating and flame-retardant barrier, ensuring the safety of the solid-state battery. Attached Figure Description
[0009] To better integrate the content illustrated in the accompanying drawings with the description of the specific embodiments, a brief introduction to the drawings is provided below. It is understood that the accompanying drawings mentioned below are merely schematic illustrations of some embodiments of the relevant technical solutions and the technical solutions of this application. Without creative effort, those skilled in the art can create drawings illustrating other embodiments.
[0010] Specifically, the annotations for the accompanying drawings are as follows:
[0011] Figure 1 This is a schematic diagram of a first structure of a solid-state battery as described in some embodiments of this application;
[0012] Figure 2 This is a schematic diagram of a second structure of a solid-state battery as described in some embodiments of this application;
[0013] Figure 3 This is a schematic diagram of a third structure of a solid-state battery as described in some embodiments of this application.
[0014] Specifically, the annotations for the figure marks in the instruction manual are as follows:
[0015] 10. Solid-state battery cell; 101. Tab; 20. Protective film; 201. Sub-protective film; X, first direction; Y, second direction; Z, third direction. Detailed Implementation
[0016] To make the embodiments of this application clearer, they will be described below in conjunction with the accompanying drawings. It should be understood that the content mentioned below represents only some embodiments of this application, and not all embodiments are listed exhaustively. Therefore, other embodiments that can be obtained based on the following embodiments without any inventive effort fall within the protection scope of this application.
[0017] It should be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to impose strict limitations on the technical solutions unless the context clearly indicates otherwise. For example, the use of "a," "an," and "the" to modify a feature does not preclude the possibility that the feature may be plural in other embodiments.
[0018] It should be understood that the terms "comprising," "including," and "having" are open-ended, indicating the presence of the stated features but not excluding the possibility of other features in the embodiment. Similarly, the use of terms such as "first," "second," etc., to describe multiple features only indicates the distinction between one feature and another, and such terms do not imply order or sequence unless explicitly stated in the context.
[0019] It should be understood that, unless the context clearly indicates otherwise, the terms "setup," "connection," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a direct connection or an indirect connection via a medium. Those skilled in the art will understand the specific meaning of these terms in this document based on the specific circumstances.
[0020] In addition, for ease of description, the text will use terms of spatial relative relationship to describe the position of one feature relative to another feature, such as "inner", "outer", "end", "side", "upper", "middle", "lower", "high", "low", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations besides those shown in the accompanying drawings of the specification.
[0021] The embodiments of this application are described below with reference to the accompanying drawings. It can be understood that the technical features involved in the different embodiments described below can be combined with each other as long as they do not conflict with each other.
[0022] Firstly, referring to Figures 1 to 3 The embodiments of this application propose a solid-state battery, which includes a solid-state cell 10 and a protective film 20. The solid-state cell 10 has a first direction X, a second direction Y and a third direction Z that are perpendicular to each other; the protective film 20 is disposed on the outside of the solid-state cell 10 and covers at least two opposite sides of the solid-state cell 10 along the third direction Z, and the protective film 20 extends beyond the solid-state cell 10 along both the first direction X and the second direction Y.
[0023] In this embodiment, a protective film 20 is provided on the outside of the solid-state battery cell 10. The solid-state battery cell 10 and the protective film 20 can be placed together in a packaging bag for pressurization. If the packaging bag is damaged, the protective film 20 can provide further protection, preventing the pressurization device from directly contacting the solid-state battery cell 10, and also preventing the damaged packaging bag from embedding into the solid-state battery cell 10. Moreover, after pressurization, due to the isolation effect of the protective film 20, the packaging bag can be easily peeled off without sticking to the solid-state battery cell 10, thereby ensuring the integrity of the solid-state battery cell 10. In addition, the protective film 20 covers at least two sides of the solid-state battery cell 10 that are subjected to pressure and extends beyond the solid-state battery cell 10. When affected by temperature during pressurization, the protective film 20 can still cover the solid-state battery cell 10 even if it shrinks. Furthermore, the protective film 20 can also block burrs inside the solid-state battery cell 10, preventing burrs from piercing the outer casing. In the event of accidental damage to the outer casing, the protective film 20 can also form a reliable insulating and flame-retardant barrier, ensuring the safety of the solid-state battery.
[0024] Optionally, the cell protective film 20 includes, but is not limited to, PE, PP, PVDF, PPTA, PI, PET, PVC, POF, OPS, ceramic-coated separator, solid electrolyte membrane, silicone rubber, EPDM rubber, fluororubber, and polyurethane.
[0025] In some embodiments, refer to Figure 1 The protective film 20 includes two protective films 201, which cover the two opposite sides of the solid-state battery cell 10 along the third direction Z.
[0026] In this embodiment, a first implementation of the protective film 20 is proposed, in which two protective films 201 cover both sides of the solid-state battery cell 10 in the thickness direction, covering the stress-bearing surface of the solid-state battery cell 10 to prevent the packaging bag from being damaged, the pressurizing device from directly contacting the solid-state battery cell 10, or the packaging bag is embedded inside the solid-state battery cell 10.
[0027] In some embodiments not shown in the figures, the portions of the two protective films 201 extending beyond the solid-state cell 10 along the first direction X can be bonded to each other, and / or the portions of the two protective films 201 extending beyond the solid-state cell 10 along the second direction Y can be bonded to each other.
[0028] In this embodiment, the edges of the two protective films 201 are bonded together by heat fusion or by an adhesive layer to prevent the protective film 20 from falling off the solid-state battery cell 10. The overall structure is stable and the protection effect is good.
[0029] In some embodiments, refer to Figure 2 The protective film 20 forms a protective bag with an opening, and the solid-state battery cell 10 is housed inside the protective bag.
[0030] In this embodiment, a second implementation of the protective film 20 is proposed. The protective film 20 is pre-formed into a protective bag to accommodate the solid-state battery cell 10, and then the whole thing is put into the packaging bag and pressurized, which is convenient to operate.
[0031] In some embodiments, refer to Figure 3 The protective film 20 is wrapped around the outside of the solid-state battery cell 10.
[0032] In this embodiment, a third implementation of the protective film 20 is proposed, namely, the protective film 20 is wrapped around the outside of the solid-state battery cell 10 to provide more comprehensive protection for the solid-state battery cell 10, which is also a desirable implementation.
[0033] In some embodiments, refer to Figure 1 The thickness of the protective film 20 along the third direction Z is d, and satisfies 1μm≤d≤200μm.
[0034] In this embodiment, the thickness of the protective film 20 cannot be too small, otherwise its own strength will be low and it will be difficult to play an effective protective role; and the thickness of the protective film 20 cannot be too large, otherwise it will occupy too much space of the shell and affect the volumetric energy density. Therefore, the thickness d of the protective film 20 should be moderate. For example, d can be any one of 1μm, 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm and 200μm or within the range of any two of these values.
[0035] In some embodiments, reference 1 and Figure 2 The protective film 20 extends beyond the solid-state battery cell 10 by a dimension L1 along the first direction X, and satisfies 2mm ≤ L1 ≤ 20mm; and / or, referring to Figure 2 The protective film 20 extends beyond the solid-state battery cell 10 by a dimension L2 along the second direction Y, and satisfies 2mm≤L2≤20mm.
[0036] In this embodiment, the protective film 20 extends beyond the solid-state battery cell 10. Even when the film contracts due to temperature changes during pressurization, it still ensures complete coverage of the solid-state battery cell 10. The dimension L1 by which the protective film 20 extends beyond the solid-state battery cell 10 along the first direction X cannot be too small, otherwise it may break due to excessive tension during contraction, or it may not adequately cover the solid-state battery cell 10. Furthermore, L1 cannot be too large, otherwise it will occupy too much space within the casing, affecting the volumetric energy density. Therefore, L1 should be moderate. For example, L1 can be any value from 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, and 20mm, or a value between any two of these values.
[0037] Similarly, the size L2 of the protective film 20 extending beyond the solid-state cell 10 along the second direction Y should also be appropriate. For example, L2 can be any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm and 20mm or within the range of any two of these values.
[0038] In some embodiments, refer to Figure 1 and Figure 2 Solid-state battery cell 10 leads out tab 101, and protective film 20 is set to avoid tab 101.
[0039] In this embodiment, the protective film 20 avoids the tab 101, that is, the tab 101 can pass through the protective film 20 to avoid mutual interference.
[0040] In some embodiments not shown in the figures, the solid-state battery also includes a housing, with the solid-state cell 10 and a protective film 20 disposed inside the housing.
[0041] In this embodiment, the protective film 20 is disposed between the solid-state battery cell 10 and the housing. It can prevent burrs on the solid-state battery cell 10 from penetrating the housing, and at the same time, it can serve as a barrier for flame retardancy and insulation of the solid-state battery cell 10 in the event of housing damage.
[0042] Secondly, embodiments of this application propose a battery pack that includes the solid-state battery of the first aspect. Therefore, the battery pack of the second aspect possesses all the technical effects of the solid-state battery of the first aspect, the technical effects of which will not be elaborated further.
[0043] It should be noted that the battery pack in this embodiment only presents the structure related to the improvement points. Of course, it may also include other components. For example, the battery pack may also include a frame for accommodating multiple solid-state batteries, as well as a liquid cooling system for heat dissipation, etc. Other components will not be described here.
[0044] In particular, the term "and / or" in this application should be understood as follows:
[0045] In the first case, the term “and / or” between the first subject and the second subject includes any of the following meanings: (1) only the first subject; (2) only the second subject; and (3) both the first subject and the second subject.
[0046] In the second case, the term "and / or" between the last two of three or more subjects means including at least any one of the subjects. For example, "first subject, second subject and / or third subject" has the same meaning as "first subject and / or second subject and / or third subject", specifically including the following combinations: (1) only the first subject; (2) only the second subject; (3) only the third subject; (4) first subject and second subject and no third subject; (5) first subject and third subject and no second subject; (6) second subject and third subject and no first subject; and (7) first subject, second subject and third subject;
[0047] Furthermore, the character " / " in this application indicates that the objects before and after it are in an "or" relationship.
[0048] Finally, although the embodiments of this application have been described above in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the concept of this application, and such modifications and variations all fall within the scope of protection of this application.
Claims
1. A solid-state battery, characterized in that, include: Solid-state battery cell (10) has two perpendicular directions: a first direction (X), a second direction (Y), and a third direction (Z); A protective film (20) is disposed on the outside of the solid-state battery cell (10) and covers at least two opposite sides of the solid-state battery cell (10) along the third direction (Z), and the protective film (20) extends beyond the solid-state battery cell (10) along both the first direction (X) and the second direction (Y).
2. The solid-state battery according to claim 1, characterized in that, The protective film (20) includes two sub-protective films (201), which respectively cover the two opposite sides of the solid-state battery cell (10) along the third direction (Z).
3. The solid-state battery according to claim 2, characterized in that, The portions of the two sub-protective films (201) extending beyond the solid-state battery cell (10) along the first direction (X) can be bonded to each other, and / or the portions of the two sub-protective films (201) extending beyond the solid-state battery cell (10) along the second direction (Y) can be bonded to each other.
4. The solid-state battery according to claim 1, characterized in that, The protective film (20) forms a protective bag with an opening, and the solid-state battery cell (10) is housed inside the protective bag.
5. The solid-state battery according to claim 1, characterized in that, The protective film (20) is wrapped around the outside of the solid-state battery cell (10).
6. The solid-state battery according to claim 1, characterized in that, The thickness of the protective film (20) along the third direction (Z) is d, and satisfies 1μm≤d≤200μm.
7. The solid-state battery according to claim 1, characterized in that, The protective film (20) extends beyond the solid-state battery cell (10) by a dimension L1 along the first direction (X), and satisfies 2mm≤L1≤20mm; And / or, the protective film (20) extends beyond the solid-state cell (10) by a dimension L2 along the second direction (Y), and satisfies 2mm≤L2≤20mm.
8. The solid-state battery according to any one of claims 1 to 7, characterized in that, The solid-state battery cell (10) has a tab (101) leading out, and the protective film (20) is arranged to avoid the tab (101).
9. The solid-state battery according to any one of claims 1 to 7, characterized in that, The solid-state battery also includes a housing, and the solid-state cell (10) and the protective film (20) are disposed inside the housing.
10. A battery pack, characterized in that, Includes the solid-state battery as described in any one of claims 1 to 9.