Battery shell, battery and battery pack
By inserting the insulating parts into the protrusions and grooves of the sealing plate and then heat-sealing them, the problem of loose connection between the lower plastic parts and the casing of the battery is solved, thus enhancing the safety performance of the battery.
Patent Information
- Application Number
- CN202423050106.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-12-10
AI Technical Summary
In existing technologies, the connection between the lower plastic component of the battery and the casing is not tight or secure, which makes it easy for the component to detach during use and affects the safety performance of the battery.
The insulating parts are inserted into the convex and groove of the sealing plate and fixed by heat fusion to enhance the tightness and firmness of the connection and prevent detachment.
This improves the tightness and firmness of the connection between the insulation component and the sealing plate, ensuring the safety performance of the battery and preventing the insulation component from detaching during use.
Smart Images
Figure CN223797510U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, specifically to battery casing, battery, and battery pack. Background Technology
[0002] A battery comprises an external structure and an internal structure. The external structure includes a casing and a cover, which together form a closed space. The internal structure includes an electrode assembly disposed within this closed space. Terminal posts are provided on the casing and / or cover for electrical connection to the electrode assembly, allowing the charge from the electrode assembly to be drawn out. The terminals and electrode assembly need to be electrically insulated from the cover and casing; therefore, multiple insulating components are provided in the battery, such as a lower plastic component that insulates the inner surface of the casing from the electrode assembly. However, in the prior art, the connection between the lower plastic component and the casing is neither tight nor secure, leading to a risk of the lower plastic component detaching from the casing during battery use, thus affecting the battery's safety performance. Utility Model Content
[0003] In view of this, the present invention provides a battery casing, a battery, and a battery pack to solve the problem that the connection between the lower plastic part and the casing is poor in the prior art, which leads to the risk of the lower plastic part separating from the casing during battery use and affects the safety performance of the battery.
[0004] In a first aspect, this utility model provides a battery casing, comprising: a casing having an internal accommodating space, one end of the casing having an opening communicating with the accommodating space, and the other end of the casing opposite to the opening having a sealing plate; an insulating member disposed within the accommodating space and fitted against the sealing plate; wherein the insulating member protrudes toward the sealing plate to form a convex bulge, and the sealing plate is recessed to form a groove, and / or the sealing plate protrudes toward the insulating member to form a convex bulge, and the insulating member is recessed to form a groove; the convex bulge is inserted into the groove, and the insulating member and the sealing plate are heat-fused and fixed at the mating positions of the convex bulge and the groove.
[0005] In one alternative embodiment, the groove is formed on the sealing plate, the sealing plate is a flat plate structure, and the groove is opened outward from the side of the sealing plate facing the receiving space along the thickness direction of the sealing plate.
[0006] In one optional embodiment, the thickness of the sealing plate is A1 along the thickness direction, and the remaining thickness of the sealing plate after the groove is formed is B1, satisfying 0.5mm≤B1≤80%A1.
[0007] In an alternative embodiment, the groove is formed on the sealing plate. Along the thickness direction of the sealing plate, a protruding portion protrudes outward from one side of the sealing plate away from the accommodation space, and the groove is opened outward from one side of the sealing plate facing the accommodation space and is correspondingly arranged with the protruding portion.
[0008] In an alternative embodiment, along the thickness direction of the sealing plate, the thickness of the sealing plate is A2, the remaining thickness of the protruding portion for opening the groove is B2, and the height of the protruding portion protruding from one side of the sealing plate away from the accommodation space is H1, satisfying 0.5 mm ≤ B2 ≤ A2, 0 < H1 ≤ 3 mm.
[0009] In an alternative embodiment, the convex bump is formed on the sealing plate. Along the thickness direction of the sealing plate, a convex bump protrudes inward from one side of the sealing plate facing the accommodation space, and a concave portion is recessed inward from one side of the sealing plate away from the accommodation space, and the concave portion is correspondingly arranged with the convex bump.
[0010] In an alternative embodiment, along the thickness direction of the sealing plate, the thickness of the sealing plate is A3, the remaining thickness of the convex bump for opening the concave portion is B3, and the height of the convex bump protruding from one side of the sealing plate facing the accommodation space is H2, satisfying 0.5 mm ≤ B3 ≤ A3, 0 < H2 ≤ 3 mm.
[0011] In an alternative embodiment, a pole hole is formed on the sealing plate; and / or, an explosion-proof valve hole is formed on the sealing plate; and / or, a liquid injection hole is formed on the sealing plate.
[0012] In a second aspect, the present utility model further provides a battery, including the above-mentioned battery housing.
[0013] In a third aspect, the present utility model further provides a battery pack, including the above-mentioned battery.
[0014] The technical solution of the present application has the following advantages:
[0015] The insulating part and the sealing plate are inserted and connected by matching the convex bump and the groove, and are thermally melted and fixed at the matching position of the convex bump and the groove, which strengthens the connection effect between the insulating part and the sealing plate, improves the tightness and firmness of the connection between the insulating part and the sealing plate, avoids the detachment of the insulating part and the sealing plate during the use of the battery, ensures the insulating effect of the insulating part, and ensures the safety performance of the battery. Description of the Drawings
[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific 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 top view of the housing according to an embodiment of the present utility model;
[0018] Figure 2 The housing along the first embodiment of this utility model Figure 1 A cross-sectional view along the AA direction;
[0019] Figure 3 for Figure 2 A magnified view of part B in the diagram;
[0020] Figure 4 for Figure 2 A schematic diagram of the external structure of the shell shown;
[0021] Figure 5 This is a schematic diagram of the structure of the insulating component according to the first embodiment of this utility model;
[0022] Figure 6 This is a top view of the housing and insulating component after they are assembled according to the first embodiment of this utility model;
[0023] Figure 7 for Figure 6 A cross-sectional view along the CC direction;
[0024] Figure 8 for Figure 7 A magnified view of part of D;
[0025] Figure 9 The shell along the second embodiment of this utility model Figure 1 A cross-sectional view along the AA direction;
[0026] Figure 10 for Figure 9 A magnified view of part of E in the diagram;
[0027] Figure 11 This is a schematic diagram of the insulating component according to the second embodiment of the present invention;
[0028] Figure 12 The housing along the third embodiment of this utility model Figure 1 A cross-sectional view along the AA direction;
[0029] Figure 13 for Figure 12A magnified view of part of F;
[0030] Figure 14 This is a schematic diagram of the insulating component according to the third embodiment of the present invention.
[0031] Explanation of reference numerals in the attached figures:
[0032] 1. Shell; 11. Accommodation space; 12. Opening; 13. Sealing plate; 131. Pole post hole; 132. Explosion-proof valve hole; 133. Liquid injection hole; 14. First side plate; 15. Second side plate; 2. Insulating component; 3. Protrusion; 4. Groove; 5. Protrusion; 6. Recess. Detailed Implementation
[0033] 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 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 protection scope of this utility model.
[0034] The following is combined Figures 1 to 14 The following describes embodiments of the present invention.
[0035] According to an embodiment of the present invention, a battery casing is provided, comprising: a casing 1 having an internal accommodating space 11, one end of the casing 1 having an opening 12 communicating with the accommodating space 11, and the other end of the casing 1 opposite to the opening 12 having a sealing plate 13; an insulating member 2 disposed within the accommodating space 11 and fitted against the sealing plate 13; wherein the insulating member 2 protrudes toward the sealing plate 13 to form a protrusion 3, and the sealing plate 13 is recessed to form a groove 4, and / or the sealing plate 13 protrudes toward the insulating member 2 to form a protrusion 3, and the insulating member 2 is recessed to form a groove 4; the protrusion 3 is inserted into the groove 4, and the insulating member 2 and the sealing plate 13 are heat-fused and fixed at the mating position of the protrusion 3 and the groove 4.
[0036] In the battery casing of this embodiment, the insulating component 2 and the sealing plate 13 are connected by the mating of the protrusion 3 and the groove 4, and are fixed by heat fusion at the mating position of the protrusion 3 and the groove 4. This strengthens the connection between the insulating component 2 and the sealing plate 13, improves the tightness and firmness of the connection between the insulating component 2 and the sealing plate 13, prevents the insulating component 2 from separating from the sealing plate 13 during battery use, ensures the insulation effect of the insulating component 2, and ensures the safety performance of the battery.
[0037] It is worth noting that the insulating component 2 may only have a protrusion 3, and the sealing plate 13 may have a groove 4 that mates with the protrusion 3; or, the insulating component 2 may only have a groove 4, and the sealing plate 13 may have a protrusion 3 that mates with the groove 4; or, the insulating component 2 may have both a protrusion 3 and a groove 4, and the sealing plate 13 may have both a groove 4 that mates with the protrusion 3 and a protrusion 3 that mates with the groove 4.
[0038] It should be noted that the insulating part 2 and the sealing plate 13 are heat-fused (e.g., ultrasonically heat-fused) at the mating position of the convex 3 and the groove 4, so that the insulating part 2 and the sealing plate 13 are fused and bonded together, and a tight bond is formed after cooling.
[0039] It is worth noting that the convex hull 3 can be cylindrical or prismatic, and the groove 4 can be adapted to the shape of the convex hull 3.
[0040] The following three implementation methods will be described regarding the arrangement of the groove 4 or the convex 3 on the sealing plate 13.
[0041] In the first implementation, such as Figures 2 to 8 As shown, a groove 4 is formed on the sealing plate 13. The sealing plate 13 is a flat plate structure. Along the thickness direction of the sealing plate 13, the groove 4 is opened outward from the side of the sealing plate 13 facing the receiving space 11.
[0042] Specifically, such as Figure 3 As shown, along the thickness direction of the sealing plate 13, the thickness of the sealing plate 13 is A1, and the remaining thickness of the sealing plate 13 after the groove 4 is formed is B1, which satisfies 0.5mm≤B1≤80%A1.
[0043] It should be noted that if the value of B1 is too small, the remaining thickness after the groove 4 is cut in the sealing plate 13 will be too small, and the groove 4 will not be easy to be stamped in the sealing plate 13, which may easily cause the sealing plate 13 to crack. If the value of B1 is too large, the remaining thickness after the groove 4 is cut in the sealing plate 13 will be too large, and it will be difficult to heat fuse the insulating part 2 with the sealing plate 13. The connection effect between the insulating part 2 and the sealing plate 13 will be poor, and there is still a risk that the insulating part 2 may easily detach from the sealing plate 13.
[0044] It is worth noting that in the first implementation, such as Figure 5 As shown, the convex bulge 3 is disposed on the insulating member 2. Further, as... Figure 2 and Figure 5 As shown, there are several grooves 4 spaced apart on the sealing plate 13, and correspondingly, there are several protrusions 3 spaced apart on the insulating part 2. The several protrusions 3 are respectively inserted into several grooves 4 and are fixedly connected by heat fusion.
[0045] The following tests were conducted on the shell 1 with different values of A1 and B1, as well as the heat fusion condition between the shell 1 and the insulating component 2. The test results are shown in Table 1. The example refers to the shell 1 that satisfies 0.5mm≤B1≤80%A1, while the comparative example refers to the shell 1 that does not satisfy 0.5mm≤B1≤80%A1.
[0046] Table 1. Test results of the heat fusion condition of the housing 1 and the insulating component 2.
[0047]
[0048] As can be seen from Table 1, in Examples 1 to 15, the thickness A1 of the sealing plate 13 and the remaining thickness B1 of the sealing plate 13 after the groove 4 is formed satisfy 0.5mm≤B1≤80%A1. The groove 4 is easy to be stamped on the sealing plate 13 and the sealing plate 13 does not crack. The pressure resistance of the shell 1 is greater than 1.2MPa. Furthermore, the insulating part 2 and the sealing plate 13 are easy to be fixed by heat fusion and do not fall off after heat fusion.
[0049] As can be seen from Table 1, in Comparative Example 1, the remaining thickness B1 of the groove 4 in the sealing plate 13 is less than 0.5 mm, which makes it difficult to stamp the groove 4 on the sealing plate 13, and the sealing plate 13 cracks after stamping.
[0050] As can be seen from Table 1, in Comparative Example 2, the ratio of the remaining thickness B1 of the groove 4 of the sealing plate 13 to the thickness A1 of the sealing plate 13 is greater than 80%, which makes it difficult for the insulating part 2 to be heat-fused with the sealing plate 13, and the insulating part 2 is prone to falling off the sealing plate 13.
[0051] In the second implementation, such as Figure 9 and Figure 10 As shown, a groove 4 is formed on the sealing plate 13. Along the thickness direction of the sealing plate 13, a protrusion 5 is formed on the side of the sealing plate 13 away from the receiving space 11. The groove 4 is opened outward from the side of the sealing plate 13 facing the receiving space 11 and is correspondingly provided to the protrusion 5.
[0052] Specifically, such as Figure 10 As shown, along the thickness direction of the sealing plate 13, the thickness of the sealing plate 13 is A2, the remaining thickness of the protrusion 5 after the groove 4 is opened is B2, and the height of the protrusion 5 protruding from the side of the sealing plate 13 away from the receiving space 11 is H1, satisfying 0.5mm≤B2≤A2, 0
[0053] It should be noted that the groove 4 and the protrusion 5 are formed on the sealing plate 13 together by stamping. Further, if the value of the height H1 of the protrusion 5 protruding from the side of the sealing plate 13 away from the accommodation space 11 is too large, it will be difficult to stamp the groove 4 and the protrusion 5 on the sealing plate 13. If the value of the remaining thickness B2 of the groove 4 formed in the protrusion 5 is too small, it is easy to cause cracking of the sealing plate 13; if the value of the remaining thickness B2 of the groove 4 formed in the protrusion 5 is too large, the remaining thickness of the protrusion 5 after forming the groove 4 is too large, and it is relatively difficult to thermally fuse the insulating member 2 and the sealing plate 13, and the connection effect between the insulating member 2 and the sealing plate 13 is poor, and there is still a risk that the insulating member 2 is prone to detachment from the sealing plate 13.
[0054] It should be noted that in the second embodiment, as Figure 11 shown, the convex hull 3 is provided on the insulating member 2. Further, as Figure 9 and Figure 11 shown, a plurality of grooves 4 are provided on the sealing plate 13 at intervals. Correspondingly, a plurality of convex hulls 3 are provided on the insulating member 2 at intervals. The plurality of convex hulls 3 are respectively inserted into the plurality of grooves 4 and are fixedly connected by thermal fusion.
[0055] In the third embodiment, as Figure 12 and Figure 13 shown, a convex hull 3 is formed on the sealing plate 13. Along the thickness direction of the sealing plate 13, the side of the sealing plate 13 facing the accommodation space 11 protrudes inward to form a convex hull 3, and the side of the sealing plate 13 away from the accommodation space 11 is recessed inward to form a recess 6, and the recess 6 is provided corresponding to the convex hull 3.
[0056] Specifically, as Figure 13 shown, along the thickness direction of the sealing plate 13, the thickness of the sealing plate 13 is A3, the remaining thickness of the convex hull 3 for forming the recess 6 is B3, and the height of the convex hull 3 protruding from the side of the sealing plate 13 facing the accommodation space 11 is H2, satisfying 0.5 mm ≤ B3 ≤ A3, 0 < H2 ≤ 3 mm.
[0057] It should be noted that the recess 6 and the convex hull 3 are formed on the sealing plate 13 together by stamping. Further, if the value of the height H2 of the convex hull 3 protruding from the side of the sealing plate 13 facing the accommodation space 11 is too large, it will be difficult to stamp the recess 6 and the convex hull 3 on the sealing plate 13. If the value of the remaining thickness B3 of the convex hull 3 for forming the recess 6 is too small, it is easy to cause cracking of the sealing plate 13; if the value of the remaining thickness B3 of the convex hull 3 for forming the recess 6 is too large, the remaining thickness of the convex hull 3 after forming the recess 6 is too large, and it is relatively difficult to thermally fuse the insulating member 2 and the sealing plate 13, and the connection effect between the insulating member 2 and the sealing plate 13 is poor, and there is still a risk that the insulating member 2 is prone to detachment from the sealing plate 13.
[0058] It should be noted that in the third embodiment, as Figure 14As shown, the groove 4 is provided on the insulating member 2. Further, as... Figure 12 and Figure 14 As shown, several protrusions 3 are spaced apart on the sealing plate 13, and correspondingly, several grooves 4 are spaced apart on the insulating part 2. Several protrusions 3 are respectively inserted into several grooves 4 and are fixedly connected by heat fusion.
[0059] It should be noted that in the first to third embodiments described above, "inward" means the direction toward the accommodating space 11, and correspondingly, "outward" means the direction away from the accommodating space 11.
[0060] In one embodiment, such as Figure 1 As shown, the sealing plate 13 has a pole hole 131.
[0061] In one embodiment, such as Figure 1 As shown, the sealing plate 13 has an explosion-proof valve hole 132.
[0062] In one embodiment, such as Figure 1 As shown, the sealing plate 13 has an injection hole 133.
[0063] It is worth noting that, such as Figure 1 As shown, the housing 1 also includes a first side plate 14 and a second side plate 15. Two first side plates 14 and two second side plates 15 are arranged at intervals relative to each other. The first side plates 14 and the second side plates 15 are sequentially connected circumferentially to form an opening 12 at one end of each side plate. A sealing plate 13 is simultaneously connected to the other end of both the first side plates 14 and the second side plates 15. Furthermore, the two first side plates 14, the two second side plates 15, and the sealing plate 13 are integrally formed.
[0064] Furthermore, the battery casing also includes a cover plate, which is connected to the casing 1 and seals the opening 12 to enclose the receiving space 11. That is, the cover plate is connected to one end of both the first side plate 14 and the second side plate 15, and the cover plate and the sealing plate 13 are arranged at intervals relative to each other.
[0065] According to an embodiment of the present invention, another aspect provides a battery including the battery casing described above.
[0066] In one embodiment, the battery further includes an electrode assembly disposed within the receiving space 11.
[0067] According to an embodiment of the present invention, in another aspect, a battery pack is also provided, including the battery described above.
[0068] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.
Claims
1. A battery housing, characterized by The application relates to a battery shell. The battery shell comprises a shell body and an insulation piece. The insulation piece is provided in the accommodating space and is attached to the sealing plate. The insulation piece is provided with a convex bump towards the sealing plate, the sealing plate is provided with a concave groove, and / or the sealing plate is provided with a convex bump towards the insulation piece, and the insulation piece is provided with a concave groove.
2. The battery case of claim 1, wherein, The sealing plate is provided with the concave groove, and the sealing plate is a flat plate structure.
3. The battery case of claim 2, wherein, The thickness of the sealing plate is A1, and the remaining thickness of the sealing plate provided with the concave groove is B1.
4. The battery case of claim 1, wherein, The sealing plate is provided with the concave groove, and the sealing plate is provided with a convex part outwardly protruding from the side of the sealing plate away from the accommodating space.
5. The battery case of claim 4, wherein, The thickness of the sealing plate is A2, the remaining thickness of the convex part provided with the concave groove is B2, and the height of the convex part protruding from the side of the sealing plate away from the accommodating space is H1.
6. The battery case of claim 1, wherein, The sealing plate is provided with the convex bump, and the sealing plate is provided with the convex bump inwardly protruding from the side of the sealing plate towards the accommodating space.
7. The battery case of claim 6, wherein, The thickness of the sealing plate is A3, the remaining thickness of the convex bump provided with the concave groove is B3, and the height of the convex bump protruding from the side of the sealing plate towards the accommodating space is H2.
8. The battery case according to any one of claims 1 to 7, characterized by, The sealing plate is provided with a pole hole. The sealing plate is provided with an explosion-proof valve hole. The sealing plate is provided with a liquid injection hole.
9. A battery, characterized by The battery shell comprises the battery shell according to any one of claims 1 to 8.
10. A battery pack, characterized by, The battery comprises the battery according to claim 9.