Battery cell and battery
By designing a special folded structure for the insulating patch on the cover plate, the short circuit problem caused by the upward curling of the insulating film folds and corners is solved, improving battery safety and adhesion, while reducing the cell size.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-07-04
- Publication Date
- 2026-07-21
AI Technical Summary
In existing technologies, the folded edges and corners of the insulating film when extending on the end face of the cover plate tend to curl upwards, which can easily cause the insulating patch to curl upwards as well, leading to a short circuit risk.
Design an insulating patch with a pair of first folds along the width of the cover plate and a pair of second folds along the length. The two sides of the insulating patch extend beyond the second folds and are attached to the insulating film on the shell to form a U-shaped structure or tape structure, thereby increasing the bonding area to prevent the folded corners from curling upwards.
This effectively prevents the insulating patch from lifting up along with the folded corner, improving battery safety, reducing the risk of short circuits, enhancing adhesion, and reducing cell size.
Smart Images
Figure CN224537154U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery cell and a battery. Background Technology
[0002] As a core component in modern energy storage, the safety and reliability of lithium-ion power batteries have always been a focus of industry attention. In existing cell structure designs, the casing surface commonly employs an insulating film coating process. This technology offers dual protection: firstly, the continuous, dense layer formed by polymer insulating materials effectively blocks electrical connections between the metal casing and the external environment, preventing accidental short circuits; secondly, this protective layer buffers the mechanical stress generated by volume expansion during charge-discharge cycles, significantly reducing the risk of mechanical damage such as casing wear and scratches. However, due to the special structural requirements of the terminal lead-out structure, complete insulation film coverage cannot be achieved in the cover area. To address this technical challenge, current solutions typically employ a composite protection method by adding insulating patches to the end face of the cover. Through the synergistic effect of the polymer patches and the insulating film, a complete electrical isolation barrier is constructed.
[0003] In actual manufacturing processes, when the insulating film extends to the end face of the cover plate, a hot-pressing folding process is commonly used to fix the end of the film material. When the patch is attached to the insulating film, if the folded corner curls upwards, the patch is very likely to curl upwards along with it, posing a short circuit risk. Utility Model Content
[0004] This utility model provides a battery cell and battery to solve the defect in the prior art where the patch also curls up when the folded corner of the edge curls up.
[0005] This utility model provides a battery cell, comprising: a first housing; a cover plate disposed on one end of the first housing, the cover plate having an output electrode block; an insulating film covering the surface of the first housing, and forming a pair of first folded edges along the width direction of the cover plate and a pair of second folded edges along the length direction of the cover plate on the end face of the cover plate, the second folded edges forming a fold angle at the connection with the first folded edges; an insulating patch disposed on the end face of the cover plate, the output electrode block being exposed outside the insulating patch, the opposite sides of the insulating patch being bent after passing over the second folded edges to attach to the insulating film on the first housing.
[0006] According to the present invention, the insulating patch is a film structure, and the insulating patch is bonded to the cover plate and the insulating film on the first housing by adhesive.
[0007] According to the present invention, the insulating patch of a battery cell is an adhesive tape.
[0008] According to the present invention, the insulating patch has oppositely arranged bent portions to form a U-shaped structure, and the U-shaped structure is snapped into the first housing.
[0009] According to the present invention, the insulating patch extends to the first housing for a length of 2mm-10mm.
[0010] According to the present invention, the insulating patch is located between a pair of first folded edges.
[0011] According to the present invention, the insulating patch is provided with a first through hole, and the output electrode block passes through the first through hole.
[0012] According to the present invention, the insulating patch includes a first patch and a second patch, wherein the first patch and the second patch are respectively located at both ends of the output electrode block.
[0013] According to the present invention, the first patch is provided with a second through hole, and the second through hole is opposite to the pressure relief valve on the cover plate.
[0014] This utility model also provides a battery, including a second housing and a battery cell as described above, wherein the battery cell is disposed within the second housing.
[0015] The battery cell provided by this utility model extends the opposite sides of the insulating patch beyond the second fold edge to the side of the first housing, thus preventing the insulating patch from lifting up along with the folded corner, avoiding short circuits in the battery, and improving battery safety. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the battery cell provided by this utility model.
[0018] Figure 2 This is an exploded view of the battery cell provided by this utility model.
[0019] Figure label: 1. First housing; 2. Cover plate; 21. Pressure relief valve; 31. First folded edge; 32. Second folded edge; 33. Folding angle; 4. Output electrode block; 5. Insulating patch; 51. First patch; 511. Bending part; 512. Second through hole; 52. Second patch. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0021] The following is combined with Figure 1 and Figure 2 This invention describes the battery cell and battery of this utility model.
[0022] like Figure 1 and Figure 2 As shown, in an embodiment of this utility model, the battery cell includes: a first housing 1, a cover plate 2, an insulating film, and an insulating patch 5. The cover plate 2 covers one end of the first housing 1 and has an output electrode block 4. The insulating film covers the surface of the first housing 1, and on the end face of the cover plate 2, a pair of first folded edges 31 are formed along the width direction of the cover plate 2, and a pair of second folded edges 32 are formed along the length direction of the cover plate 2. A fold angle 33 is formed at the connection between the second folded edges 32 and the first folded edges 31. The insulating patch 5 is disposed on the end face of the cover plate 2, and the output electrode block 4 is exposed outside the insulating patch 5. The opposite sides of the insulating patch 5 are bent after passing over the second folded edges 32 to attach to the insulating film on the first housing 1.
[0023] Specifically, after the insulating film is wrapped around the first housing 1, the excess portion forms a pair of first folded edges 31 and a pair of second folded edges 32 on the end face of the cover plate 2. The first folded edges 31 are arranged along the width direction of the cover plate 2, and the second folded edges 32 are arranged along the length direction of the cover plate 2, so as to cover the edge portion of the cover plate 2.
[0024] In this embodiment, the insulating patch 5 is disposed on the end face of the cover plate 2. The two ends of the insulating patch 5 can be located between a pair of first folded edges 31, meaning that when the insulating patch 5 is attached to the cover plate 2, the pair of first folded edges 31 are exposed. The two sides of the insulating patch 5 extend beyond the second folded edges 32 and are attached to the insulating film on the first housing 1. In this embodiment, since the folded angle 33 is located outside the insulating patch 5, when the folded angle 33 is raised, the insulating patch 5 will not be raised along with it.
[0025] Optionally, both ends of the insulating patch 5 may also extend to the first folded edge 31 and cover the first folded edge 31. Since the two sides of the insulating patch 5 extend beyond the second folded edge 32 to the side of the first housing 1, the folded angle 33 is sealed by the insulating patch 5. The folded angle 33 is under pressure and will not curl up. Correspondingly, the insulating patch 5 will not curl up either.
[0026] Optionally, in an embodiment of this utility model, the insulating patch 5 can be a film structure, which is bonded to the end face of the cover plate 2 and the insulating film of the first housing 1 using adhesive; the insulating patch 5 can also be a plastic part with a certain hardness, the insulating patch 5 forms a U-shaped structure, and the insulating patch 5 is snapped into the first housing 1.
[0027] Furthermore, since the cover plate 2 is provided with an output electrode block 4, the number of insulating patches 5 can be one, which has a through hole at the position opposite to the output electrode block 4 so that the output electrode block 4 can be exposed when the insulating patch 5 is attached to the cover plate 2; alternatively, the number of insulating patches 5 can also be two, with the two insulating patches 5 respectively disposed on both sides of the output electrode block 4.
[0028] The battery cell provided in this embodiment of the utility model extends the opposite sides of the insulating patch beyond the second fold edge to the side of the first housing, thus preventing the insulating patch from lifting up along with the folded corner, avoiding short circuits in the battery, and improving battery safety.
[0029] Optionally, in one embodiment of the present invention, the insulating patch 5 is a film structure, and the insulating patch 5 is bonded to the insulating film on the cover plate 2 and the first housing 1 by adhesive.
[0030] Specifically, in the cell structure, the terminal block passes through the cover plate 2 and connects to the output electrode block 4. As the size of the terminal block increases, the size of the output electrode block 4 also increases, resulting in a narrower distance between the edge of the output electrode block 4 and the edge of the cover plate 2, and a narrower width of the second folded edge 32. Previously, the width of the second folded edge 32 was typically 2mm, but with the increase in the diameter of the terminal block, the width of the second folded edge 32 is now typically 1mm. When the insulating patch 5 is directly bonded to the cover plate 2, the bonding amount between the insulating patch 5 and the second folded edge 32 is small, which easily leads to weak bonding. However, with the insulating patch 5 used in this embodiment, the insulating patch 5 extends beyond the second folded edge 32 to the side of the first housing 1, and the insulating patch 5 has a larger bonding area with the insulating film on the first housing 1, improving the bonding strength.
[0031] Optionally, in an embodiment of this invention, the length of the insulating patch 5 extending onto the first housing 1 is 2mm-10mm. It is understood that the longer the insulating patch 5 is on the first housing 1, the stronger the adhesion.
[0032] Furthermore, in the prior art, the thickness of the insulating patch is typically 1.5mm, and the thickness of the adhesive is also 1.5mm. When the patch is bonded to the cover plate 2, its total thickness is 3mm. However, in the embodiment of this utility model, the insulating patch 5 itself is adhesive, that is, the insulating patch 5 can be an adhesive tape. It is directly attached to the cover plate 2 and the first housing 1 using its own adhesiveness, without the need for glue. The advantage of this arrangement is that the thickness of the insulating patch 5 can be further reduced, thereby reducing the volume of a single battery cell. Optionally, in this embodiment, the thickness of the insulating patch 5 can be 0.15mm-0.5mm, thereby significantly reducing the thickness of the insulating patch 5.
[0033] Optionally, in another embodiment of this utility model, the insulating patch 5 has opposing bent portions 511 to form a U-shaped structure, which is snapped into the first housing 1. In this embodiment, the U-shaped structure can be directly snapped into the first housing 1 to avoid electrical short circuit between the first housing 1 and the outside; at the same time, there is no need to provide adhesive between the U-shaped structure and the cover plate 2, making assembly simpler. When the thickness of the U-shaped structure is 1.5mm, since no adhesive is needed between the U-shaped structure and the cover plate 2, it can still reduce the thickness of the insulating patch 5, thereby reducing the volume of the battery cell. In this embodiment, the two ends of the U-shaped structure can be located between a pair of first folded edges 31 to expose the folded corner 33; optionally, the two ends of the U-shaped structure can also extend to the first folded edges 31 and cover the first folded edges 31. Since the U-shaped structure has a certain rigidity, it can press down on the folded corner 33 to prevent the folded corner 33 from curling up.
[0034] like Figure 1 As shown, in an embodiment of this utility model, the insulating patch 5 is located between a pair of first folded edges 31 to expose the folded corner 33, thereby reducing the amount of insulating patch 5 used and lowering manufacturing costs.
[0035] Optionally, the insulating patch 5 can be an integral structure. The insulating patch 5 is provided with a first through hole, and the position of the first through hole is opposite to the position of the output electrode 4, so that the output electrode 4 passes through the first through hole and is exposed to the outside.
[0036] Optionally, the insulating patch 5 may also include a first patch 51 and a second patch 52. The first patch 51 and the second patch 52 are located at both ends of the output electrode block 4 to expose the output electrode block 4. In this embodiment, the first patch 51 and the second patch 52 can both be adhesive tape, wherein the first patch 51 is bonded between a first folded edge 31 and a first end of the output electrode block 4, and the second patch 52 is bonded between a second end of the output electrode block 4 and another first folded edge 31. Both ends of each patch extend to the side of the first housing 1.
[0037] Optionally, the first patch 51 and the second patch 52 can both be U-shaped pieces. The first patch 51 and the second patch 52 are both snapped into the first housing 1. The first patch 51 is disposed between a first folded edge 31 and the first end of the output electrode block 4, and the second patch 52 is disposed between the second end of the output electrode block 4 and the other first folded edge 31.
[0038] like Figure 2 As shown, in an embodiment of this utility model, the first patch 51 is provided with a second through hole 512. The cover plate 2 is provided with a pressure relief valve 21, and the second through hole 512 is opposite to the pressure relief valve 21.
[0039] Furthermore, the insulating patch 5 is also provided with a third through hole for exposing the positive and negative polarity markings, so as to mark the polarity of the output electrode block 4.
[0040] In this embodiment of the invention, the battery cell is a blade battery cell. Both ends of the first housing 1 have openings, and both ends of the first housing 1 are provided with cover plates 2. An insulating film extends onto the two cover plates 2, forming a folded angle 33. In this embodiment, insulating patches 5 are respectively provided on the two cover plates 2.
[0041] This utility model embodiment also provides a battery, including a battery cell and a second housing. The battery cell is disposed within the second housing.
[0042] Specifically, the battery cell includes: a first housing 1, a cover plate 2, an insulating film, and an insulating patch 5. The cover plate 2 is disposed on one end of the first housing 1, and the cover plate 2 is provided with an output electrode block 4. The insulating film covers the surface of the first housing 1, and on the end face of the cover plate 2, a pair of first folded edges 31 are formed along the width direction of the cover plate 2, and a pair of second folded edges 32 are formed along the length direction of the cover plate 2. The connection between the second folded edges 32 and the first folded edges 31 forms a fold angle 33. The insulating patch 5 is disposed on the end face of the cover plate 2, and the output electrode block 4 is exposed outside the insulating patch 5. The opposite sides of the insulating patch 5 are bent after passing over the second folded edges 32 to attach to the insulating film on the first housing 1.
[0043] In this embodiment, the insulating patch 5 is disposed on the end face of the cover plate 2. The two ends of the insulating patch 5 can be located between a pair of first folded edges 31, meaning that when the insulating patch 5 is attached to the cover plate 2, the pair of first folded edges 31 are exposed. The two sides of the insulating patch 5 extend beyond the second folded edges 32 and are attached to the insulating film on the first housing 1. In this embodiment, since the folded angle 33 is located outside the insulating patch 5, when the folded angle 33 is raised, the insulating patch 5 will not be raised along with it.
[0044] Optionally, both ends of the insulating patch 5 may also extend to the first folded edge 31 and cover the first folded edge 31. Since the two sides of the insulating patch 5 extend beyond the second folded edge 32 to the side of the first housing 1, the folded angle 33 is sealed by the insulating patch 5. The folded angle 33 is under pressure and will not curl up. Correspondingly, the insulating patch 5 will not curl up either.
[0045] The battery provided in this embodiment of the utility model extends the insulating patch of the battery cell across the second fold edge to the side of the first shell, thus preventing the insulating patch from lifting up along with the folded corner when it does, avoiding short circuits and improving battery safety.
[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A battery cell, characterized in that, include: First shell; A cover plate is provided on one end of the first housing, and the cover plate is provided with an output electrode block; An insulating film is wrapped around the surface of the first housing, and a pair of first folded edges are formed on the end face of the cover plate along the width direction of the cover plate, and a pair of second folded edges are formed along the length direction of the cover plate. The second folded edges and the first folded edges form a folding angle at the connection point. An insulating patch is disposed on the end face of the cover plate, the output electrode block is exposed outside the insulating patch, and the opposite sides of the insulating patch are bent after passing the second folded edge to attach to the insulating film on the first housing.
2. The battery cell according to claim 1, characterized in that, The insulating patch has a film-like structure, and the insulating patch is bonded to the insulating film on the cover plate and the first housing by adhesive.
3. The battery cell according to claim 2, characterized in that, The insulating patch is an adhesive tape.
4. The battery cell according to claim 1, characterized in that, The insulating patch has opposing bent portions to form a U-shaped structure, which engages with the first housing.
5. The battery cell according to claim 1, characterized in that, The insulating patch extends 2mm-10mm onto the first housing.
6. The battery cell according to claim 1, characterized in that, The insulating patch is located between a pair of the first folded edges.
7. The battery cell according to claim 6, characterized in that, The insulating patch has a first through hole, and the output electrode block passes through the first through hole.
8. The battery cell according to claim 6, characterized in that, The insulating patch includes a first patch and a second patch, which are located at the two ends of the output electrode block, respectively.
9. The battery cell according to claim 8, characterized in that, The first patch is provided with a second through hole, which is opposite to the pressure relief valve on the cover plate.
10. A battery, characterized in that, It includes a second housing and a battery cell as described in any one of claims 1-9, wherein the battery cell is disposed within the second housing.