A pole press ring of a lithium ion battery

Abstract

The utility model relates to battery accessory technical field, concretely is a kind of pole of lithium ion battery's compression ring.The utility model includes compression ring and the clamping structure of the upper surface setting of compression ring, the clamping structure is used to with insulation piece mechanical interlock to prevent insulation piece and compression ring axial separation;The clamping structure is connecting groove, and the cross section of connecting groove has reverse buckle locking portion;Or the clamping structure is protruding block, and protruding block cross section has hook locking portion, and the mechanical interlock is formed by the injection molding material embedding connecting groove or wrapping in the outer periphery of protruding block by insulation piece.The utility model can strengthen the connectivity between insulation piece and compression ring, avoid the situation that insulation piece falls after the glue of both is removed.

Description

Technical Field

[0001] This utility model relates to the field of battery accessory technology, specifically a terminal pressure ring for a lithium-ion battery. Background Technology

[0002] Lithium-ion batteries are high-efficiency rechargeable batteries widely used in electronic products and electric vehicles, favored for their high energy density and long cycle life. The battery cell terminal structure typically looks like this... Figure 5 As shown, the electrode post 30, which serves as the conductive body, is fixed to the substrate 40 by a metal clamping ring 10. An insulating member 20 is provided above the clamping ring 10, covering the clamping ring 10 and allowing the electrode post 30 to pass through.

[0003] Specifically, the insulating component is directly heat-fused to the surface of the pressure ring via injection molding, thus forming a tight fit. Theoretically, this design can maintain the interfacial bonding strength during battery charging and discharging temperature fluctuations by matching the thermal expansion coefficients of the injection molding material and the metal pressure ring.

[0004] However, the applicant discovered in practice that delamination and debonding are prone to occur at the interface between the insulating component and the upper surface of the pressure ring. There are two main reasons for this phenomenon: first, the aging of the insulating material; and second, the Joule heating generated by the current load during long-term battery operation, coupled with the differential thermal expansion behavior of the insulating layer due to ambient temperature, causing the interfacial shear stress to exceed the adhesive strength threshold. This problem is particularly pronounced under low-temperature cold start or high-rate charge / discharge conditions. Clearly, this debonding defect directly damages the integrity of the cell terminal structure, inducing a series of battery malfunctions, and in severe cases, even safety accidents, thus requiring urgent resolution. Utility Model Content

[0005] In order to avoid and overcome the technical problems existing in the prior art, this utility model provides a terminal pressure ring for a lithium-ion battery, which can strengthen the connection between the insulating component and the pressure ring and avoid the situation where the insulating component falls off after the two are delaminated.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A lithium-ion battery terminal ring includes a ring and a snap-fit ​​structure on its upper surface. This snap-fit ​​structure is used for mechanical interlocking with an insulating component to prevent axial separation of the insulating component from the ring. The snap-fit ​​structure is either a connecting groove with a reverse locking portion in its cross-section, or a protrusion with a hook locking portion in its cross-section. The mechanical interlock is formed by the injection molding material of the insulating component being embedded in the connecting groove or wrapped around the protrusion, effectively resisting interfacial separation forces caused by differences in material thermal expansion coefficients and long-term vibration. This not only increases the difficulty of debonding between the ring and the insulating component but also strengthens the connection between them, preventing the insulating component from falling off after debonding.

[0007] As a further embodiment of this utility model: the cross-sectional profile of the connecting groove includes at least one groove wall with a non-vertical plane structure, which constitutes the inverted locking part. This structure allows the injection-molded material to form a mechanical snap after curing in the groove, which can effectively resist axial separation force.

[0008] As a further embodiment of this utility model: the non-vertical groove wall is a stepped wall or inclined wall in which the width of the connecting groove gradually increases from top to bottom; or the outline of the non-vertical groove wall is arc-shaped, wavy, or toothed, and the stepped wall or inclined wall is easy to process and form; while the arc-shaped, wavy, or toothed shape can further increase the contact area and locking path, making the interlocking more secure.

[0009] As a further improvement of this utility model, the connecting groove is an inverted T-shaped groove, a dovetail groove, or a parallelogram groove. These are all typical self-locking structures that can provide a stable and reliable inverted locking effect.

[0010] As a further embodiment of this invention: the cross-sectional profile of the protrusion includes at least one sidewall with a non-vertical plane structure, which forms the hook locking part. This structure allows the injection molding material to wrap around the outside of the protrusion and form a hook, thus achieving reliable axial locking.

[0011] As a further embodiment of this utility model: the sidewall of the non-vertical structure is a stepped wall or inclined wall that makes the protrusion gradually widen from bottom to top at the sidewall; or the sidewall contour of the non-vertical structure is arc-shaped, wavy, or comb-shaped. These structural designs increase the contact surface between the protrusion and the insulating material and the mechanical interlocking force to prevent it from coming off.

[0012] As a further improvement of this utility model, the protrusion is a T-shaped block, a dovetail block, or a parallelogram block. These shapes of protrusions have good tensile strength, ensuring the strength of the mechanical interlock.

[0013] As a further improvement of this utility model: the connecting groove is arranged on the horizontal part parallel to the pressure ring and the base plate, and the connecting groove is arranged radially along the pressure ring, and the outer end of the connecting groove is flush with the outer edge of the pressure ring. This arrangement is not only structurally reasonable, but more importantly, it provides a smooth channel for the flow and filling of materials during injection molding, ensuring the integrity of the interlocking structure.

[0014] As a further improvement of this utility model, the connecting groove is configured as at least two that are evenly distributed around the axis of the pressure ring. This design can make the locking force evenly distributed, avoid the skewing or local stress concentration between the insulating part and the pressure ring due to uneven force, and make the connection more stable.

[0015] As a further improvement of this invention: the lower surface of the horizontal portion of the pressure ring is provided with an annular bottom groove coaxial with the pressure ring, and the bottom of the annular bottom groove is connected to the bottom of the connecting groove, and the annular bottom groove is also connected to the connecting groove. This allows the insulating material to simultaneously fill the upper connecting groove and the lower annular bottom groove during the injection molding of the insulating frame, forming a through "I"-shaped or similar reinforcing rib at the connection point, greatly enhancing the interlocking strength and peel resistance. Furthermore, when the injection molding material of the insulating component fills the annular bottom groove, an annular sealing barrier is formed at the connection between the pressure ring and the substrate, strengthening the sealing effect between the pressure ring and the substrate. Simultaneously, it also ensures a stable heat-melt bond between the insulating component and the substrate.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. A snap-fit ​​structure is provided on the upper surface of the pressure ring to mechanically interlock with the insulating component, preventing axial separation of the insulating component from the pressure ring. The snap-fit ​​structure can be a connecting groove or a protrusion. When the injection molding material of the insulating component is embedded in the connecting groove or wrapped around the outer periphery of the protrusion, after cooling and solidification, a strong mechanical interlock is formed axially between the injection molding material and the pressure ring, effectively resisting interface separation forces caused by differences in the thermal expansion coefficients of the materials and long-term vibration. This not only increases the difficulty of debonding between the pressure ring and the insulating component but also strengthens the connection between the insulating component and the pressure ring, preventing the insulating component from falling off after debonding.

[0017] 2. The connecting groove is arranged on the horizontal part parallel to the pressure ring and the base plate, and the connecting groove is set radially along the pressure ring, with the outer end of the connecting groove flush with the outer edge of the pressure ring. This design facilitates the smooth flow of injection molding material from the side to fill the connecting groove, ensuring molding quality, and also facilitates the processing of the connecting groove.

[0018] 3. The connecting grooves are set to at least two that are evenly distributed around the axis of the pressure ring in the circumferential direction to provide a uniform circumferential locking force and enhance the stability of the structure.

[0019] 4. An annular bottom groove, coaxial with the pressure ring, is machined on the lower surface of the horizontal portion of the pressure ring, and the bottom of the annular bottom groove is interconnected with the bottom of the connecting groove. This allows the insulating material to simultaneously fill both the upper connecting groove and the lower annular bottom groove during injection molding of the insulating frame, forming a through-type "I" or similar reinforcing rib at the connection point, greatly enhancing the interlocking strength and peel resistance. Furthermore, when the injection molding material of the insulating component fills the annular bottom groove, an annular sealing barrier is formed at the connection between the pressure ring and the substrate, strengthening the sealing effect between the pressure ring and the substrate. Simultaneously, it also ensures a stable heat-fused bond between the insulating component and the substrate. Attached Figure Description

[0020] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0021] Figure 2 This is a side view of the structure of this utility model.

[0022] Figure 3 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 4 This is a bottom view of the structure of this utility model.

[0024] Figure 5 This is a schematic diagram of the assembly structure of the pressure ring in the prior art.

[0025] In the diagram: 10, pressure ring; 11, connecting groove; 12, annular bottom groove; 20, insulating component; 30, pole post; 40, substrate. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] For ease of understanding, the specific structure and working method of this utility model are further described below with reference to the accompanying drawings: The specific structure of this utility model is as follows: Figure 1-4 As shown, its main structure includes a pressure ring 10 and a snap-fit ​​structure provided on the upper surface of the pressure ring 10 for mechanically interlocking with the insulating member 20 to prevent the insulating member 20 from axially separating from the pressure ring 10.

[0028] It is worth mentioning that the card connection structure in this application still retains the following features. Figure 5 The assembly process between the pressure ring 10, the insulating component 20, the substrate 40 and the pole post 50 is shown in the prior art.

[0029] Example 1: The snap-fit ​​structure is a connecting groove 11 formed on the upper surface of the pressure ring 10, and the cross-section of the connecting groove 11 has an inverted locking portion. During the injection molding process of the battery insulation component 20, molten insulating material is injected into the mold and flows to the surface of the pressure ring 10, fully embedding into the interior of the connecting groove 11. After cooling and solidification, the insulating material embedded in the connecting groove 11 forms a protruding structure that interlocks with the groove structure, especially with the inverted locking portion, thereby forming a strong mechanical interlock in the axial direction, effectively resisting the interface separation force caused by the difference in the thermal expansion coefficient of the materials and long-term vibration.

[0030] Specifically, the cross-sectional profile of the connecting groove 11 includes at least one groove wall with a non-vertical planar structure, which forms an inverted locking portion. However, it is obvious that the non-vertical planar structure of the groove wall in this embodiment is not simply a non-vertical planar structure; it also needs to be combined with the function of the connecting groove 11 in preventing the insulating member 20 from axially separating from the pressure ring 10. Obviously, although the trapezoidal structure of the connecting groove 11, which is wider at the top and narrower at the bottom, also has a non-vertical planar groove wall, it does not have a mechanical interlocking function and is not within the scope of protection of this application.

[0031] In practical implementations, the non-vertical groove wall can be a structure in which the width of the connecting groove 11 gradually increases from top to bottom, such as a dovetail groove formed by inclined walls, or a stepped wall formed by a combination of horizontal and vertical walls, such as an inverted T-shaped groove. In other implementations, the non-vertical groove wall can also be an arc shape, a wave shape, or a comb shape, which can form an effective backlash locking mechanism.

[0032] Furthermore, the connecting groove 11 is arranged on a horizontal portion of the pressure ring 10 parallel to the surface of the substrate 40, and the connecting groove 11 is radially arranged along the pressure ring 10, with its outer end flush with the outer edge of the pressure ring 10. This design facilitates the smooth flow of injection molding material from the side to fill the connecting groove 11, ensuring molding quality, and also facilitates the processing of the connecting groove 11. As an optimization, the connecting groove 11 is configured as at least two (e.g., four or six) evenly distributed around the axis of the pressure ring 10 to provide a circumferentially uniform locking force and enhance the stability of the structure.

[0033] Example 2: The difference between this example and Example 1 lies in the form of the snap-fit ​​structure. In this example, the snap-fit ​​structure is a protrusion (not shown in the accompanying drawings) formed on the upper surface of the pressure ring 10, and the cross-sectional profile of the protrusion has a hook-locking portion. During the injection molding of the insulating part 20, the injection material flows and wraps around the outer periphery of the protrusion, especially filling the space below formed by the hook-locking portion. After curing, the insulating part 20, through the structure that wraps around the protrusion, interlocks with the hook-locking portion of the protrusion, forming a reliable mechanical interlock, preventing axial separation, and effectively resisting the interface separation force caused by the difference in the thermal expansion coefficient of the materials and long-term vibration.

[0034] Specifically, the cross-sectional profile of the protrusion includes at least one sidewall with a non-vertical planar structure, which forms a hook-locking portion. Similarly, the non-vertical planar sidewall in this embodiment is not simply a non-vertical planar structure; it must also be combined with the aforementioned protrusion's function of preventing the insulating member 20 from axially separating from the pressure ring 10. Obviously, although the trapezoidal structure of the protrusion, which is narrower at the top and wider at the bottom, also has a non-vertical planar groove wall, it does not have a mechanical interlocking function and is not within the scope of protection of this application.

[0035] In practical implementation, the sidewalls of non-vertical structures can be such that the protrusions gradually widen from bottom to top, for example, using dovetail blocks formed by sloping walls, or stepped walls formed by a combination of horizontal and vertical walls, such as T-shaped blocks. In other embodiments, the sidewall contours of non-vertical structures can also be arc-shaped, wavy, or comb-shaped, etc., to form an effective hook-and-lock design.

[0036] Example 3: As Figure 1 As shown in either 3 or 4, this embodiment is a further optimization based on embodiment 1. In addition to the connecting grooves 11 radially distributed on the horizontal surface of the pressure ring 10, an annular bottom groove 12 coaxial with the pressure ring 10 is also machined on the lower surface of the horizontal portion of the pressure ring 10. Crucially, the bottom of the annular bottom groove 12 is connected to the bottom of the connecting groove 11.

[0037] This design offers multiple benefits: First, during injection molding, the insulating material can simultaneously fill the upper connecting groove 11 and the lower annular bottom groove 12, forming a through-type reinforcing rib at the connection point, greatly enhancing the interlocking strength and peel resistance. Second, when the injection molding material of the insulating component 20 fills the annular bottom groove 12, an annular sealing barrier is formed at the connection between the pressure ring 10 and the substrate 40, strengthening the sealing effect between the pressure ring 10 and the substrate 40. Simultaneously, it also ensures a stable thermal fusion bond between the insulating component 20 and the substrate 40.

[0038] Of course, those skilled in the art will recognize that this invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0040] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A terminal ring for a lithium-ion battery, characterized in that, The device includes a pressure ring (10) and a snap-fit ​​structure on the upper surface of the pressure ring (10). The snap-fit ​​structure is used to mechanically interlock with the insulating element (20) to prevent the insulating element (20) from axially separating from the pressure ring (10). The snap-fit ​​structure is a connecting groove (11), and the cross-section of the connecting groove (11) has an inverted locking part. Alternatively, the snap-fit ​​structure is a protrusion, and the cross-section of the protrusion has a hook locking part. The mechanical interlock is formed by the injection molding material of the insulating element (20) being embedded in the connecting groove (11) or wrapped around the outer periphery of the protrusion.

2. The electrode ring of a lithium-ion battery according to claim 1, characterized in that, The cross-sectional profile of the connecting groove (11) includes at least one groove wall with a non-vertical plane structure, which forms the inverted locking part.

3. The electrode ring of a lithium-ion battery according to claim 2, characterized in that, The non-vertical structure has a groove wall that is a stepped or inclined wall in which the width of the connecting groove (11) gradually increases from top to bottom; or the groove wall of the non-vertical structure has an arc shape, a wave shape or a toothed shape.

4. The electrode ring of a lithium-ion battery according to claim 1, 2, or 3, characterized in that, The connecting groove (11) is an inverted T-shaped groove, a dovetail groove, or a parallelogram groove.

5. The electrode ring of a lithium-ion battery according to claim 1, characterized in that, The cross-sectional profile of the protrusion includes at least one sidewall with a non-vertical planar structure, which forms the hook locking portion.

6. The electrode ring of a lithium-ion battery according to claim 5, characterized in that, The sidewall of the non-vertical structure is a stepped or inclined wall in which the protrusion gradually widens from bottom to top; or the sidewall profile of the non-vertical structure is arc-shaped, wavy, or comb-shaped.

7. The electrode ring of a lithium-ion battery according to claim 1, 5, or 6, characterized in that, The protrusion is a T-shaped block, a dovetail block, or a parallelogram block.

8. The electrode ring of a lithium-ion battery according to claim 1, 2, or 3, characterized in that, The connecting groove (11) is arranged on the horizontal part of the pressure ring (10) and the substrate (40) plate surface, and the connecting groove (11) is arranged radially along the pressure ring (10), and the outer end of the connecting groove (11) is flush with the outer edge of the pressure ring (10).

9. The electrode ring of a lithium-ion battery according to claim 8, characterized in that, The connecting grooves (11) are configured to be at least two that are evenly distributed around the axis of the pressure ring (10).

10. The electrode ring of a lithium-ion battery according to claim 8, characterized in that, The lower surface of the horizontal portion of the pressure ring (10) is provided with an annular bottom groove (12) coaxial with the pressure ring (10), and the bottom of the annular bottom groove (12) is connected to the bottom of the connecting groove (11).

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