Electrochemical device and electric apparatus

Abstract

The utility model relates to electrochemical device and electric equipment, including electric core, the top surface of electric core is equipped with the top seal edge perpendicular to the top surface and extends outward, be equipped with the tab in the top seal edge, be equipped with the gasket on the top surface, the side of gasket away from the top surface is equipped with the protection board subassembly, the tab is bent to the protection board subassembly and is connected with the protection board subassembly electricity, the protection board subassembly is covered with injection molding glue structure spare, the utility model discloses a bending point setting at the tab can reach within 1mm tolerance stable. The gasket can help the heat dissipation of electric core head package and reduce the use amount of injection molding glue.

Description

Technical Field

[0001] This utility model relates to the field of battery cell packaging, and more particularly to electrochemical devices and electrical equipment. Background Technology

[0002] Battery cells, as an indispensable core component of modern electronic devices, essentially convert chemical energy into electrical energy to power various devices. In daily life, we experience the presence of battery cells almost everywhere, from our mobile phones and cameras that capture precious moments, to laptops and tablets that help us work efficiently—all rely on the stable power provided by battery cells. With their superior performance, battery cells play a crucial role in people's lives and work.

[0003] To ensure the safety and stability of battery cells during use, their design and construction must be rigorous and precise. A battery cell typically consists of an electrode assembly and an insulating film. The electrode assembly is the core of the cell, including the positive electrode, the negative electrode, and the insulating film between them. These three components, through precise arrangement and combination, enable the generation and transmission of electrical energy. The insulating film, such as an aluminum-plastic film, is used to wrap the electrode assembly to ensure the insulation of the cell's internal structure and prevent safety accidents such as short circuits.

[0004] The battery cell's electrode assembly is carefully housed in a packaging bag with top and side seals to ensure the cell's airtightness and structural stability. At the top of the bag, one end of the tab is tightly connected to the electrode assembly, while the other end extends from the top seal to connect to external devices. The top seal not only serves as a channel for the tab but also as a connection point between the battery body and external electrical connectors (such as the battery protection board, or PCM). While this design ensures smooth connection between the cell and external devices, it also results in a relatively large overall size of the battery assembly, which is undoubtedly a waste of space in today's increasingly compact terminal devices.

[0005] Patent CN221708817U discloses a battery cell packaging structure that effectively reduces volume by folding the top sealing edge towards the top surface and the side sealing edges towards the sides. While this structure effectively improves space utilization, the cell head needs to be bent, requiring significant investment in bending and inspection equipment, resulting in high automation costs. Furthermore, because the sealed area is close to the cell body, bending can compromise the cell's safety, increasing the risk of short circuits. On the other hand, the bending of the cell body results in a battery length dimension that is a combination of the cell body length and the sealing edge thickness, leading to significant dimensional instability. After assembly, large dimensional deviations can cause the packaged battery to wobble within the battery compartment. Additionally, due to the battery's high power and heat generation, components on the protection board after low-pressure injection molding are completely encased in plastic, hindering heat dissipation and potentially causing heat buildup and component failure. Utility Model Content

[0006] To address the aforementioned problems in the prior art, this invention provides an electrochemical device.

[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0008] An electrochemical device includes a battery cell; the top surface of the battery cell has a top sealing edge that is perpendicular to the top surface and extends outward; an electrode tab is provided inside the top sealing edge; a gasket is provided on the top surface; a protective plate assembly is provided on the side of the gasket away from the top surface; the electrode tab is bent toward the protective plate assembly and electrically connected to the protective plate assembly; the protective plate assembly is covered with an injection-molded structural component.

[0009] In one embodiment of the present invention, the protection board assembly includes a substrate and a flexible circuit board; the flexible circuit board is electrically connected to the substrate.

[0010] In one embodiment of this utility model, the substrate is arranged parallel to the top surface; the distance between the side of the substrate away from the top surface and the top surface is greater than the maximum distance between the top sealing edge and the top surface by 'a'; 0 ≤ a ≤ 1.5 mm.

[0011] In one embodiment of this utility model, the substrate and the pad are spaced apart; the substrate and the pad also include an injection-molded structural component; the flexible circuit board is electrically connected to the side of the substrate near the top surface or to the side of the substrate away from the top surface.

[0012] In one embodiment of this utility model, the injection-molded structural component is provided with a plurality of positioning holes that abut against the substrate so that the positioning post arranged parallel to the top surface of the substrate leaves a plurality of positioning holes during injection molding; before the electrode tab is folded, the electrode tab is electrically connected to the substrate; the distance between the side of the substrate away from the top surface and the bottom surface of the battery cell opposite the top surface is a preset distance b; the electrode tab is pre-folded on the side of the substrate near the electrode tab and the top surface, and the angle between the substrate and the pad is c when pre-folded; 0°≤c≤45°.

[0013] In one embodiment of the present invention, the gasket is at least partially covered by the injection-molded structural component.

[0014] In one embodiment of this utility model, the distance between the side of the injection-molded structural component away from the top surface and the top surface is greater than the maximum distance between the top sealing edge and the top surface by d; wherein 0.5≤d≤3mm.

[0015] In one embodiment of this utility model, the gasket is any one of a plastic gasket, a silicone gasket, or a phase change material gasket.

[0016] In one embodiment of this utility model, the length of the pad is less than the width of the battery cell; the length direction of the pad is parallel to the width direction of the battery cell; the thickness of the pad is h; and 0.3 ≤ h ≤ 2 mm.

[0017] An electrical device comprising the electrochemical device described in any one of the preceding claims.

[0018] The beneficial effects of this invention are as follows: In existing technologies, considering the cumulative tolerances of battery edge sealing bending and polymer cell tolerances, the tolerance range of the processed cell is approximately 1.5mm. This results in batteries of varying lengths, with no means of compensation. The phone compartment requires strong double-sided adhesive to secure the battery and prevent it from shifting within the compartment due to its short length, which could cause the FPC to break. This invention, by placing the bending point at the tab, achieves a stable tolerance within 1mm. The gasket also helps with heat dissipation during cell head encapsulation and reduces the amount of injection molding compound used. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is an exploded view of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the cross-section of the battery cell head of this utility model;

[0022] Figure 3 yes Figure 2 Enlarged diagram of section A in the middle;

[0023] Figure 4 This is a schematic diagram of the structure of the battery cell and protection board assembly of this utility model when it is not folded.

[0024] Figure 5 This is a schematic diagram of the structure of the battery cell and protection board assembly of this utility model when folded;

[0025] Figure 6 This is a three-dimensional structural view of the present invention;

[0026] Figure 7 yes Figure 6 Schematic diagram of the cross-section at the positioning hole;

[0027] Figure 8 This is a schematic diagram of the pad placement position in this utility model. Figure 1 ;

[0028] Figure 9 This is a schematic diagram of the pad placement position in this utility model. Figure 2 ;

[0029] Figure 10 This is a schematic diagram of the cross-section of the structure of this utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100. Battery cell; 110. Top surface; 120. Top sealing edge; 130. Electrode tab; 140. Side surface; 150. Side sealing edge; 160. Bottom surface; 200. Gasket; 300. Protective board assembly; 310. Substrate; 320. Flexible circuit board; 400. Injection molded structural component; 410. Positioning hole. Detailed Implementation

[0032] 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 a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0033] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing 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 this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] like Figure 1 As shown, the electrochemical device includes a battery cell 100; the battery cell 100 includes a top surface 110 and two opposing side surfaces 140; the side surfaces 140 are provided with side sealing edges 150 folded toward the side surfaces 140 and attached to the side surfaces 140; the folding of the side sealing edges 150 can save the size in the width direction of the battery cell 100.

[0036] The top surface 110 of the battery cell 100 is provided with a top sealing edge 120 that is perpendicular to the top surface 110 and extends outward; the top sealing edge 120 is not folded to avoid the risk of short circuit that may be caused by folding; a tab 130 is provided inside the top sealing edge 120; a pad 200 is provided on the top surface 110; a protective plate assembly 300 is provided on the side of the pad 200 away from the top surface 110; the tab 130 is bent toward the protective plate assembly 300 and electrically connected to the protective plate assembly 300; the protective plate assembly 300 is covered with an injection-molded structural component 400. This structure prevents the top sealing edge 120 from folding. While an unfolded top sealing edge 120 would occupy space above the top surface 110 of the cell 100, the space occupied by the pad 200 and the protective plate assembly 300 on the top surface 110 effectively compensates for the size of the top sealing edge 120, making efficient use of space. Folding only the tab 130 ensures reliable folding and avoids short-circuit risks. Furthermore, concentrating the folding at the tab 130 facilitates folding and reduces its difficulty. Since the top sealing edge 120 is typically made of aluminum-plastic film, its protrusion is limited, generally less than the thickness of the cell 100, resulting in a smaller size. In existing technologies, folding... It requires considerable force to achieve this, and it is also necessary to ensure that the top sealing edge 120 is attached to the top surface 110, which requires the use of adhesive materials such as glue for fixation, which is time-consuming and labor-intensive. In this utility model, the folding is transferred to the tab 130. Since the tab 130 is easy to fold and its width is also limited, the folding difficulty can be effectively reduced. The rebound stress of the tab 130 after folding is also smaller. The stability of the tab 130 after folding can be effectively guaranteed by the covering of the injection molding structural component 400. On the other hand, since the low-pressure injection molding temperature of the injection molding structural component 400 is 160~190℃, the stress generated by the tab 130 and / or the tab 130 glue at the folding point can be released, thereby further stabilizing the dimensions of the injected battery and reducing the impact of stress.

[0037] In one embodiment of the present invention, the protective board assembly 300 includes a substrate 310 and a flexible circuit board 320; the flexible circuit board 320 is electrically connected to the substrate 310; in one embodiment, one flexible circuit board 320 may be provided at each end of the substrate 310.

[0038] like Figure 2-3 As shown, Figure 2This is a cross-sectional schematic diagram of the tab 130 perpendicular to the top surface 110. In one embodiment of this utility model, the substrate 310 is arranged parallel to the top surface 110. The distance between the side 140 of the substrate 310 away from the top surface 110 and the top surface 110 is greater than the maximum distance between the top sealing edge 120 and the top surface 110 by 'a'. The value 0 ≤ a ≤ 1.5 mm means that the top sealing edge 120 needs to be located on the left side of the substrate 310 so that it can hold the folding part at the tab 130 position. Limiting the size of 'a' ensures the effective folding of the tab 130 and minimizes the space occupied above the top surface 110.

[0039] In one embodiment of this utility model, the substrate 310 and the pad 200 are spaced apart; an injection-molded structural component 400 is further included between the substrate 310 and the pad 200; the flexible circuit board 320 is electrically connected to a side 140 of the substrate 310 near the top surface 110 or to a side 140 of the substrate 310 away from the top surface 110. Figure 9 As shown, at this time, the flexible circuit board 320 is electrically connected to the side of the substrate 310 near the top surface 110, that is, the flexible circuit board 320 is connected to the lower surface of the substrate 310; the electrical connection can be soldered or connected using a connector; therefore, in another embodiment, the flexible circuit board 320 can also be electrically connected to the side 140 of the substrate 310 away from the top surface 110, that is... Figure 9 Electrical connections are made to the upper surface of the middle substrate 310;

[0040] like Figure 6-7 As shown, in one embodiment of this utility model, the injection molding structural component 400 is provided with a plurality of positioning holes 410 left during injection molding by positioning posts that abut against the substrate 310 so that the substrate 310 is parallel to the top surface 110. The positioning holes 410 are left after the positioning posts (not shown in the figure) have been worked, and 2-6 positioning holes 410 are provided. The structure of this utility model can effectively ensure the dimensional stability of the final product and reduce dimensional errors.

[0041] See Figure 4 As shown, when the tab 130 is not folded, the tab 130 is vertically upward. This is achieved by controlling... Figure 4 The size of b is constant, which can effectively ensure the dimensional stability after final folding; that is, before the tab 130 is folded, the tab 130 is electrically connected to the substrate 310; the distance between the side of the substrate 310 away from the top surface 110 and the bottom surface 160 of the cell 100 opposite the top surface 110 is a preset distance b.

[0042] like Figure 5As shown, the tab 130 is pre-folded on the side of the substrate 310 near the top surface 110. During pre-folding, the angle between the substrate 310 and the pad 200 is c; 0°≤c≤45°. By controlling the size of b and keeping the size of the substrate 310 relatively fixed, the folding position of the tab 130 is also relatively fixed, thus ensuring that the distance between the substrate 310 and the bottom surface 160 is relatively stable after final folding, thereby reducing the error in the length dimension of the final cell 100. The pre-folding does not require the tab 130 to remain parallel to the pad 200 after bending; it only needs to be bent at the specified bending point. The specific limiting is achieved through positioning posts.

[0043] See Figure 6-7 As shown, after the tab 130 is soldered to the substrate 310, the following steps are performed: Figure 5 After pre-folding, the positioning post approaches the substrate 310, bringing the substrate 310 to a position parallel to the pad 200. Low-pressure injection molding is then performed to form the injection-molded structural component 400. During this process, due to the positioning post, a positioning hole 410 is ultimately formed on the injection-molded structural component 400. The advantage of this structure is that after the tab 130 is bent, there is no need to fix its specific position after bending; instead, the position of the substrate 310 can be defined by the subsequent injection-molded structural component 400. After defining the preset distance b, the distance the positioning post moves during low-pressure injection molding can be easily limited, making positioning convenient. It should be noted that the positioning post is not part of the structure of this utility model, but rather a component that needs to be described when specifically explaining the manufacturing process. It is not a structure that this utility model actually protects; the positioning hole 410 is simply a specific structure left when the positioning post is used.

[0044] like Figure 8-9 As shown, in one embodiment of this utility model, the gasket 200 is at least partially covered by the injection-molded structural component 400; as Figure 8 As shown, the surface above the gasket 200 is exposed and not covered by the injection-molded structural component 400; as Figure 9 As shown, the surface above the gasket 200 is covered by the injection-molded structural component 400; different placement positions of the gasket 200 have different effects; such as Figure 8 The structure, with a 200mm exposed pad, effectively ensures heat dissipation and better facilitates heat exchange; such as Figure 9 The structure of the injection-molded structural component 400 provides better wrapping effect for the head of the battery cell 100, resulting in better dust protection and sealing.

[0045] like Figure 8-9As shown, in one embodiment of this utility model, the distance between the side 140 of the injection-molded structural component 400 away from the top surface 110 and the top surface 110 is greater than the maximum distance between the top sealing edge 120 and the top surface 110 by d; 0.5≤d≤3mm; by limiting the dimension d, it can be ensured that the final injection-molded structural component 400 can cover the outside of the tab 130, avoiding the tab 130 from being exposed and improving safety.

[0046] In one embodiment of this utility model, the gasket 200 is any one of a plastic gasket, a silicone gasket, or a phase change material gasket. When the gasket 200 is a plastic or silicone gasket, it can reduce the use of injection molding, lower costs, and avoid shrinkage; when the gasket 200 is a phase change material gasket, it directly contacts the device surface to conduct heat away for heat dissipation, resulting in better heat dissipation.

[0047] like Figure 10 As shown, in one embodiment of this utility model, the length of the pad 200 is less than the width of the battery cell 100; the length direction of the pad 200 is parallel to the width direction of the battery cell 100; the thickness of the pad 200 is h; 0.3≤h≤2mm; the length of the pad 200 is i, and the width of the battery cell 100 is L;

[0048] An electrical device comprising the electrochemical device described in any one of the preceding claims.

[0049] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An electrochemical device, characterized by: The battery includes a battery cell (100); the top surface (110) of the battery cell (100) is provided with a top sealing edge (120) that is perpendicular to the top surface (110) and extends outward; the top sealing edge (120) is provided with a tab (130); a liner (200) is provided on the top surface (110); a protective plate assembly (300) is provided on the side of the liner (200) away from the top surface (110); the tab (130) is bent toward the protective plate assembly (300) and electrically connected to the protective plate assembly (300); the protective plate assembly (300) is covered with an injection-molded structural component (400).

2. The electrochemical device of claim 1, wherein: The protection board assembly (300) includes a substrate (310) and a flexible circuit board (320); the flexible circuit board (320) is electrically connected to the substrate (310).

3. The electrochemical device of claim 2, wherein: The substrate (310) is arranged parallel to the top surface (110); the distance between the side (140) of the substrate (310) away from the top surface (110) and the top surface (110) is greater than the maximum distance between the top sealing edge (120) and the top surface (110) by 0; 0 ≤ a ≤ 1.5 mm.

4. The electrochemical device of claim 2, wherein: The substrate (310) and the pad (200) are spaced apart; the substrate (310) and the pad (200) also include an injection molding structural component (400); the flexible circuit board (320) is electrically connected to one side (140) of the substrate (310) near the top surface (110) or to one side (140) of the substrate (310) away from the top surface (110).

5. The electrochemical device of claim 2, wherein: The injection molding structure (400) is provided with a plurality of positioning holes (410) that abut against the substrate (310) so that the positioning post of the substrate (310) is parallel to the top surface (110) during injection molding; before the electrode (130) is folded, the electrode (130) is electrically connected to the substrate (310); the distance between the side of the substrate (310) away from the top surface (110) and the bottom surface (160) of the cell (100) opposite to the top surface (110) is a preset distance b; the electrode (130) is pre-folded on the side of the substrate (310) near the electrode (130) and the top surface (110), and the angle between the substrate (310) and the pad (200) during pre-folding is c; 0°≤c≤45°.

6. The electrochemical device of claim 1, wherein: The gasket (200) is at least partially covered by the injection-molded structural component (400).

7. The electrochemical device of claim 1, wherein: The distance between the side (140) of the injection-molded structural component (400) away from the top surface (110) and the top surface (110) is greater than the maximum distance between the top sealing edge (120) and the top surface (110) by d; wherein 0.5≤d≤3mm.

8. The electrochemical device of claim 1, wherein: The gasket (200) is any one of plastic gasket, silicone gasket, or phase change material gasket.

9. The electrochemical device according to claim 1, characterized in that: The length of the pad (200) is less than the width of the cell (100); the length direction of the pad (200) is parallel to the width direction of the cell (100); the thickness of the pad (200) is h; 0.3≤h≤2mm.

10. An electric device, characterized by Includes the electrochemical device as described in any one of claims 1 to 9.

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