Cover plate structure, battery cell and battery pack

Abstract

The utility model relates to the technical fields of battery manufacturing provide a cover plate structure, electric core and battery package, the cover plate structure includes cover plate body, plastic piece, cover plate patch and insulation suite, and the cover plate body has the first surface, and the plastic piece is fixedly established on the first surface of cover plate body, and protrudes from the first surface, and the cover plate patch is pasted on the first surface, and the cover plate patch is equipped with the through -hole, and the through -hole is compatible with the outer contour of plastic piece, and the inner wall surface between through -hole and the outer wall surface of plastic piece has assembly gap, and the insulation suite includes main part, first annular rim part and second annular rim part, and the first annular rim part is butt joint with cover plate patch, and the second annular rim part is butt joint with plastic piece, and the sealed space is formed between the outer wall surface of plastic piece and main part, and the assembly gap is located in the sealed space, the utility model discloses through the setting of insulation suite, makes insulation suite can realize the sealing of assembly gap, avoids the assembly gap exposure, and improves the safety performance of electric core.

Description

Technical Field

[0001] This utility model relates to the technical field of battery manufacturing, and in particular to a cover plate structure, a battery cell, and a battery pack. Background Technology

[0002] A typical battery cell structure includes a casing, with a cover assembly on top of the casing. The cover assembly is connected to the casing and forms a sealed housing space within the casing, where the electrode assembly is located. The electrode assembly and the cover assembly are welded together to form the entire battery circuit. Insulation of the battery is usually achieved by attaching cover patches to the cover assembly.

[0003] In related technologies, the cover plate assembly has an upper plastic structure, and the upper plastic usually protrudes from the light aluminum sheet in the cover plate assembly. Due to the limitations of the processing technology, there is a certain gap between the cover plate patch and the upper plastic. The upper plastic is used to install the terminal post. This makes it easy for conductive media in the external environment to enter through the gap, thereby causing the risk of short circuit failure between the terminal post and the cover plate body. Utility Model Content

[0004] This utility model provides a cover plate structure, a battery cell, and a battery pack to solve the defect in the prior art where the gap between the cover plate patch and the upper plastic can easily cause short circuits between the terminals and the cover plate body.

[0005] This utility model provides a cover plate structure, including: a cover plate body, a plastic part, a cover plate patch, and an insulating kit. The cover plate body has a first surface; the plastic part is fixedly disposed on the first surface of the cover plate body and protrudes from the first surface; the cover plate patch is attached to the first surface, and the cover plate patch has a through hole, the through hole being adapted to the outer contour of the plastic part, and an assembly gap is formed between the inner wall surface of the through hole and the outer wall surface of the plastic part; the insulating kit includes a main body, a first annular edge, and a second annular edge, the first annular edge abutting against the cover plate patch, the second annular edge abutting against the plastic part, a sealing space being formed between the main body and the outer wall surface of the plastic part, and the assembly gap being located within the sealing space.

[0006] According to the cover plate structure provided by this utility model, along the direction where the first surface is located, the first annular edge extends outward away from the plastic part, and the second annular edge extends inward toward the plastic part.

[0007] According to the cover plate structure provided by this utility model, the extension widths of the first annular edge portion and the second annular edge portion are the same along the direction where the first surface is located.

[0008] According to the cover plate structure provided by this utility model, it further includes an electrode body and an electrode terminal, the electrode body is connected to the electrode terminal, and the electrode terminal is disposed on the plastic part; along the thickness direction of the cover plate body, the second annular edge covers the surface of the plastic part and contacts the electrode terminal.

[0009] According to the cover plate structure provided by this utility model, the side of the first annular edge portion that contacts the cover plate patch and the side of the second annular edge portion that contacts the plastic part are both provided with an adhesive layer.

[0010] According to the cover plate structure provided by this utility model, the thickness of the insulating kit is 0.1mm≤t≤0.5mm.

[0011] According to the cover plate structure provided by this utility model, the width of the assembly gap is 0 < L ≤ 1 mm.

[0012] According to the cover plate structure provided by this utility model, the insulating kit includes one of a rubber insulating kit, a PP insulating kit, or a PET insulating kit.

[0013] The present invention also provides a battery cell, comprising: a housing and a cover structure as described in any of the preceding claims; the housing having a receiving space for accommodating an electrode assembly; and the cover structure being disposed on the top of the housing.

[0014] This utility model also provides a battery pack, including a plurality of battery cells as described above, wherein the plurality of battery cells are connected in series or in parallel via a plate.

[0015] The cover plate structure, battery cell, and battery pack provided by this utility model, through the setting of the insulating kit, enable the insulating kit to seal the assembly gaps, avoid the exposure of the assembly gaps, and improve the safety performance of the battery cell. 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 an exploded structural diagram of the cover plate structure provided by this utility model.

[0018] Figure 2 This is an exploded structural diagram of the battery cell provided by this utility model.

[0019] Figure 3 This is a cross-sectional view of the internal structure of the battery cell provided by this utility model.

[0020] Figure 4 This utility model provides Figure 3 A schematic diagram of the local structure at point A.

[0021] Figure label: 10. Cover plate structure; 11. Cover plate body; 111. First surface; 12. Plastic part; 13. Terminal body; 131. Terminal terminal; 14. Cover plate patch; 141. Through hole; 142. Assembly gap; 15. Insulation kit; 20. Housing. Detailed Implementation

[0022] 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.

[0023] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0025] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0027] In related technologies, due to manufacturing tolerances and equipment positioning tolerances of the cover plate patch, a certain gap exists between the cover plate patch and the upper plastic, leaving the corresponding portion of the cover plate body exposed to the air. For batteries used in environments with large temperature differences between day and night, water droplets will condense on the battery's outer surface. When the battery is exposed to this environment for a long time, the condensed water droplets will gradually accumulate and enter the gap, potentially causing a short circuit between the terminals and the cover plate body, posing a significant safety risk. Alternatively, if there are metal wires connecting the terminals and the casing, a short circuit failure of the entire battery may occur, leading to a serious accident.

[0028] To address the issues in the relevant technologies, the following will be discussed in conjunction with... Figures 1-4This invention describes a cover plate structure, including a cover plate body 11, a plastic part 12, a cover plate patch 14, and an insulating kit 15. The cover plate body 11 has a first surface 111. The plastic part 12 is fixedly disposed on the first surface 111 of the cover plate body 11 and protrudes from the first surface 111. The cover plate patch 14 is attached to the first surface 111 and has a through hole 141. The through hole 141 is adapted to the outer contour of the plastic part 12, and the through hole... There is an assembly gap 142 between the inner wall surface of 141 and the outer wall surface of the plastic part 12; the insulating kit 15 includes a main body 151, a first annular edge 152 and a second annular edge 153. The first annular edge 152 abuts against the cover plate patch 14, and the second annular edge 153 abuts against the plastic part 12. A sealed space 154 is formed between the main body 151 and the outer wall surface of the plastic part 12, and the assembly gap 142 is located within the sealed space 154. Due to the limitations of the processing technology, after the cover plate patch 14 is connected to the cover plate body 11, there is a certain assembly gap 142 between the edge contour of its through hole 141 and the outer contour surface of the plastic part 12. Since the pole is located inside the plastic part 12, this increases the risk of short circuit between the pole and the cover plate. In this embodiment, by setting the insulating kit 15, a sealed space 154 is formed between the insulating kit 15 and the plastic part 12, and the assembly gap 142 is located in the sealed space 154, thereby achieving the sealing of the assembly gap 142 and improving the safety performance of the battery cell.

[0029] Specifically, such as Figure 1 As shown, the cover plate body 11 has an overall elongated block structure, and has a first surface 111 and a second surface that are opposite to each other. In specific connection, the first surface 111 is opposite to the housing 20, while the second surface faces the housing 20 and is connected to the electrode assembly. The cover plate patch 14 includes a sheet-like substrate, one side of which is coated with an adhesive, and the cover plate patch 14 is connected to the first surface 111 of the cover plate by the adhesive.

[0030] The cover plate body 11 is provided with an assembly hole, and a plastic part 12 is disposed in the assembly hole, protruding from the first surface 111. During connection and assembly, the cover plate patch 14 is attached to the first surface 111, thereby covering most of the area of ​​the cover plate body 11 (the uncovered area is the area where the assembly gap 142 is located), achieving overall insulation. In this embodiment, in order to prevent conductive impurities and conductive metal wires from the external environment from falling into the assembly gap 142, the assembly gap 142 is sealed into the sealing space 154, thereby improving the insulation of the cover plate structure 10.

[0031] It is understandable that, due to the influence of processing technology and assembly tolerances, the through hole 141 on the cover plate patch 14 is difficult to perfectly match the contour of the plastic part 12. This results in a certain assembly gap 142 between the cover plate patch 14 and the plastic part 12, which affects the overall safety performance. In this embodiment, by placing the insulating kit 15 on the outside of the plastic part 12 and forming a sealed space 154 between the insulating kit 15 and the plastic part 12, the assembly gap 142 is located within the sealed space 154. This avoids the risk of short circuit due to conduction between the pole and the cover plate body 11, thus improving safety performance.

[0032] In a specific configuration, the insulating kit 15 includes one of the following: a rubber insulating kit 15, a PP insulating kit 15 (an insulating kit 15 made of polyethylene terephthalate material), or a PET insulating kit 15 (an insulating kit 15 made of polypropylene material). By limiting the materials, the insulating kit 15 can have good insulation performance and high temperature resistance.

[0033] Specifically, the rubber insulation kit 15 facilitates assembly, making assembly faster. The PP insulation kit 15 is made of PP material, which has good insulation properties, a high melting point, good heat resistance, and good toughness, resulting in good impact resistance and elasticity, thus enhancing the overall structural stability. The PET insulation kit 15 is made of PET material, which has good heat resistance, can withstand high temperatures, and has good mechanical properties, including high tensile and compressive strength, further improving the overall structural stability.

[0034] It is understandable that the battery cell will generate a certain temperature when it is working, and this temperature will be transferred to the insulation kit 15. In this embodiment, by limiting the material of the insulation kit 15, the insulation kit 15 has good insulation properties and good high temperature resistance.

[0035] In conjunction with the above embodiments, such as Figure 3 , Figure 4 As shown, along the direction of the first surface 111, the first annular edge portion 152 extends outward away from the plastic part 12, and the second annular edge portion 153 extends inward toward the plastic part 12. The insulating kit 15 is made entirely of insulating material, and it forms a sealed space 154 by cooperating with the plastic part 12. By placing the assembly gap 142 within the sealed space 154, the assembly gap 142 is sealed. In this embodiment, by extending the first annular edge portion 152 and the second annular edge portion 153 in different directions, the overall stress on the plastic part 12 can be more uniform, and a connection structure can be formed between the plastic part 12 and the cover plate patch 14, thereby improving the overall structural strength of the cover plate structure 10.

[0036] Specifically, the plastic part 12 has an overall ring-shaped structure. The inner side of the plastic part 12 is the side facing the space enclosed by the interior of the plastic part 12, and similarly, the outer side of the plastic part 12 is the side away from the interior space of the plastic part 12. In this embodiment, the first annular edge portion 152 and the second annular edge portion 153 extend in opposite directions and are connected to each other. This makes the overall stress distribution more uniform and has good structural stability.

[0037] It is understood that the cover plate patch 14 is connected to the cover plate body 11 by adhesive bonding, and the plastic part 12 is fixed in the assembly hole of the cover plate body 11. In this embodiment, the connection between the plastic part 12 and the cover plate patch 14 is achieved by the insulating kit 15, thereby enabling a stable connection structure between the cover plate patch 14 and the plastic part 12 and improving the stability of the cover plate structure 10.

[0038] In conjunction with the above embodiments, such as Figure 4 As shown, along the direction of the first surface 111, the first annular edge portion 152 and the second annular edge portion 153 have the same extension width. By limiting the extension width, it is beneficial to prepare the first annular edge portion 152 and the second annular edge, and it makes the force more uniform after connection and the structural stability higher.

[0039] Specifically, the insulating kit 15 is fitted with the plastic part 12 as a ring-shaped component. The first ring edge 152 and the second ring edge 153 extend in opposite directions. This arrangement facilitates the separate connection of the two ring edges, and by limiting their radial extension width to be the same, it can have a more uniform stress distribution after sealing, thus improving the overall stability.

[0040] Understandably, having the same radial extension width on both edges simplifies mold design, creating a more symmetrical profile and improving production efficiency, reducing mold costs, and minimizing production defects (such as warping and shrinkage). Furthermore, flanges of equal width are more likely to achieve uniform compression and deformation under assembly or working pressure. This uniformity helps create consistent contact pressure and sealing lines at the two sealing interfaces (cover plate patch 14 and plastic part 12), reducing the risk of leakage due to insufficient or excessive local pressure, thereby improving the overall reliability of the seal.

[0041] In conjunction with the above embodiments, the cover plate structure further includes a pillar body 13 and an electrode terminal 131. The electrode body 13 is connected to the electrode terminal 131, and the electrode terminal 131 is disposed on the plastic part 12. Along the thickness direction of the cover plate body 11, a second annular edge portion 153 covers the surface of the plastic part 12 and contacts the electrode terminal 131. The contact between the second annular edge portion 153 and the electrode terminal 131 along the thickness direction of the cover plate body 11 improves the stability of the overall structure, resulting in higher stability of the cover plate assembly.

[0042] Specifically, the electrode body 13 and the electrode terminal 131 are part of the overall electrode structure. One end of the electrode body 13 is connected to the electrode terminal 131, and the other end of the electrode body 13 is connected to the tab on the electrode assembly. The electrode terminal 131 and the electrode body 13 are used to realize power conduction. When multiple cells form a battery pack, multiple cells can be connected in series or in parallel through the connection of the tabs. In this embodiment, the second annular edge portion 153 contacts and engages with the electrode terminal 131 (usually an aluminum block structure) to limit the position of the electrode terminal 131, thereby improving the overall structural stability.

[0043] In some instances, such as Figure 4 As shown, the thickness of the insulating kit 15 is 0.1mm ≤ t ≤ 0.5mm. By limiting the thickness of the insulating kit 15, it is possible to optimize space occupation, material cost, flexibility and thermal management performance while meeting the core functions (insulation and sealing).

[0044] Specifically, internal space in modern electronic products is extremely precious. A thickness of 0.1-0.5mm almost compresses the space occupied by the insulation kit to its limit, allowing designers to place more components, larger capacity batteries, or implement more complex structures within a confined space, driving the development of devices towards thinner, lighter, and more compact designs. Furthermore, plastic itself is a poor conductor of heat. A thinner insulation layer means that heat can be transferred more easily through the insulation layer in scenarios requiring heat conduction (such as certain heat dissipation paths) or minimizing the thermal insulation effect. Less material means less heat storage, allowing for faster thermal equilibrium under rapidly changing temperature conditions, reducing the impact of lag in response to changes in ambient temperature (such as thermal stress).

[0045] In specific embodiments, the thickness t of the insulating kit 15 is 0.1mm, 0.4mm, 0.7mm, 1.0mm, 1.3mm or 1.5mm.

[0046] In some embodiments, an adhesive layer is provided on the side of the first annular edge 152 that contacts the cover plate patch 14, and on the side of the second annular edge 153 that contacts the plastic part 12. The insulating kit 15 is connected to the plastic part 12 and the cover plate patch 14 by adhesive bonding. In this embodiment, the setting of the adhesive layer facilitates the connection of the insulating kit 15, making the overall assembly more convenient.

[0047] Specifically, an adhesive backing is applied to one side of the first annular edge portion 152 and the second annular edge portion 153 to form an adhesive layer. The adhesive layer facilitates the connection of the insulating kit 15, making the connection process faster.

[0048] In some embodiments, such as Figure 4 As shown, the first annular edge portion 152 and the second annular edge portion 153 of the insulating kit 15 have an extension width of 0.5mm-1.5mm in the width direction. This size range ensures that the connection surface between the insulating kit 15 and the cover plate patch 14 has a stable connection structure and strong sealing performance. It can avoid affecting the sealing performance due to the extension width being too short, and it can also avoid occupying other space due to the extension width being too long.

[0049] Specifically, a width less than the lower limit (0.5mm) may result in an insufficient contact area at the first edge during connection, leading to insufficient structural strength of the connection, difficulty in ensuring stable sealing performance, and a risk of seal failure. On the other hand, a width greater than the upper limit of 1.5mm will encroach on the surrounding space and may interfere with other components (such as adjacent electronic components or the structure of housing 20).

[0050] Furthermore, if the overall material of the insulating kit 15 is too wide, it will affect the overall layout of the cover structure 10 and increase the overall weight of the battery cell. If it is too narrow, it will result in poor sealing of the assembly gap 142. In this embodiment, the limitation on the extension width allows it to seal the assembly gap 142 while also facilitating the overall layout.

[0051] In a specific embodiment, the first annular edge portion 152 and the second annular edge portion 153 of the insulating kit 15 have an extension width of 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm or 1.5 mm in the width direction.

[0052] In conjunction with the above embodiments, such as Figure 4 As shown, the width of the assembly gap 142 is 0 < L < 1 mm. The limitation of the assembly gap 142 can meet the requirements of rapid assembly of the cover plate patch 14 and also improve the rational utilization of the space of the cover plate structure 10.

[0053] Specifically, the assembly gap 142 has a certain width, which allows the insulating kit 15 to be assembled easily and quickly. However, the width cannot be too large, as an excessively large width would affect the overall layout of the cover structure 10, leading to unnecessary structural features. This embodiment, by limiting the width, satisfies the requirement for quick assembly without being too wide and affecting the overall layout design.

[0054] In a specific implementation, the width L of the assembly gap 142 is 0.3mm, 0.6mm, 0.8mm or 1.0mm.

[0055] Specifically, such as Figure 1 , Figure 3 As shown, the cross-sectional structure of the insulating kit 15 is approximately "Z" shaped. By defining the shape of the insulating kit 15, the strength of the covering connection can be improved, effectively resisting external mechanical impacts.

[0056] The present invention also provides a battery cell, comprising: a housing 20 and a cover structure 10 as provided in any of the above claims; the housing 20 has a receiving space for accommodating an electrode assembly; the cover structure 10 is disposed on the top of the housing 20.

[0057] The battery cell provided in this example has the cover plate structure 10 of any of the aforementioned embodiments. Therefore, the battery cell in this example has the characteristic effects of each of the aforementioned cover plate structures 10. To avoid the redundancy of the effect description, it will not be repeated here.

[0058] This utility model also provides a battery pack, including multiple cells as described above, wherein the multiple cells are connected in series or in parallel via a plate.

[0059] The battery pack provided in this example has the battery cell of any of the aforementioned embodiments. Therefore, the battery pack in this example has the characteristic effects of each of the aforementioned battery cell embodiments. To avoid redundancy in the effect description, it will not be repeated here.

[0060] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment, through the provision of the insulating kit 15, enables the insulating kit 15 to seal the assembly gap 142, preventing the assembly gap 142 from being exposed and improving the safety performance of the battery cell. Furthermore, by limiting the specifications of the insulating kit 15 and the assembly gap 142, it is possible to achieve rapid assembly of the insulating kit 15 and improve the sealing performance of the assembly gap 142, thereby enhancing safety performance.

[0061] 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 cover plate structure, characterized in that, include: The cover plate body has a first surface; A plastic part is fixedly disposed on the first surface of the cover plate body and protrudes from the first surface; A cover plate patch is attached to the first surface. The cover plate patch has a through hole that is adapted to the outer contour of the plastic part, and there is an assembly gap between the inner wall of the through hole and the outer wall of the plastic part. An insulating kit, comprising a main body, a first annular edge, and a second annular edge, wherein the first annular edge abuts against the cover plate patch, and the second annular edge abuts against the plastic part, and a sealing space is formed between the main body and the outer wall surface of the plastic part, and the assembly gap is located within the sealing space.

2. The cover plate structure according to claim 1, characterized in that, Along the direction of the first surface, the first annular edge extends outward away from the plastic part, and the second annular edge extends inward toward the plastic part.

3. The cover plate structure according to claim 2, characterized in that, Along the direction of the first surface, the first annular edge portion and the second annular edge portion have the same extension width.

4. The cover plate structure according to claim 2, characterized in that, It also includes a pole body and a pole terminal, the pole body being connected to the pole terminal, and the pole terminal being disposed on the plastic part; along the thickness direction of the cover plate body, the second annular edge covers the surface of the plastic part and contacts the pole terminal.

5. The cover plate structure according to claim 1, characterized in that, An adhesive layer is provided on the side of the first annular edge that contacts the cover plate patch and on the side of the second annular edge that contacts the plastic part.

6. The cover plate structure according to claim 1, characterized in that, The thickness t of the insulating kit is 0.1mm ≤ t ≤ 0.5mm.

7. The cover plate structure according to claim 1, characterized in that, The width of the assembly gap is 0 < L ≤ 1 mm.

8. The cover plate structure according to claim 1, characterized in that, The insulation kit includes one of rubber insulation kit, PP insulation kit or PET insulation kit.

9. A battery cell, characterized in that, include: The housing and the cover plate structure as described in any one of claims 1-8; A housing having a receiving space for accommodating the electrode assembly; The cover plate structure is located on the top of the housing.

10. A battery pack, characterized in that, It includes multiple battery cells as described in claim 9, wherein the multiple battery cells are connected in series or in parallel via a battery pack.

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