Battery end surface hot pressing shaping tool

Abstract

The utility model relates to the technical field of battery preparation, and discloses a battery end face hot pressing shaping tool, wherein the battery comprises a shell and a battery cell, wherein the battery cell is accommodated in the shell, and comprises: an upper pressing mold and a lower pressing mold which are opposed to each other, wherein the lower pressing mold is provided with a plurality of accommodating grooves, and each of the accommodating grooves is used to place a battery; a plurality of hot pressing heads are arranged on the upper pressing mold, and the plurality of hot pressing heads correspond to the plurality of accommodating grooves one by one, and each of the hot pressing heads is provided with a hot pressing part and a limiting groove, wherein the limiting groove is arranged around the hot pressing part, and when the hot pressing shaping operation is performed, the hot pressing part is hot-pressed against the battery cell, and the open end of the shell is limited in the limiting groove, and the battery end face hot pressing shaping tool can improve the consistency and effect of hot pressing, and reduce the battery safety problems caused by poor hot pressing.

Description

Technical Field

[0001] The utility model relates to the technical field of battery preparation, in particular to a battery end surface hot pressing shaping tool. Background Art

[0002] At present, steel shell button batteries face many challenges in the production process, especially in the hot pressing and shaping process before and after the winding core is put into the shell. As the battery size continues to shrink, the requirements for hot pressing and shaping technology are getting higher and higher. Especially when the winding core diameter is small, the selection and implementation of the hot pressing and shaping process becomes more complicated and delicate.

[0003] For batteries with larger core diameters (>8mm), the double-side end surface hot pressing process is relatively mature, but for batteries with smaller core diameters (≤8mm), due to the difficulty of clamping, the single-side end surface hot pressing shaping process after shelling is usually selected. However, this process also exposed some problems during implementation.

[0004] First, although the hot pressing method of multiple stations with continuous jigs can improve production efficiency, the lack of installation and positioning accuracy often leads to poor consistency of hot pressing, which in turn affects the performance of the battery. In addition, poor hot pressing effect may also cause the edge diaphragm to be exposed from the shell, which will not only cause the sealing weld to explode, but also pose a threat to the safety performance of the battery.

[0005] On the other hand, although single-station hot pressing can ensure high hot pressing accuracy and consistency, it cannot meet the needs of large-scale production due to its low efficiency. Therefore, how to improve production efficiency while ensuring the hot pressing effect is an important issue facing the current steel shell button battery production. Summary of the invention

[0006] The utility model aims to overcome the shortcomings of the prior art and provide a battery end surface hot pressing shaping tool.

[0007] The purpose of this utility model is achieved through the following technical solutions:

[0008] A battery end surface hot pressing shaping tool, the battery comprises a shell and a battery cell, the battery cell is accommodated in the shell, and comprises: an upper pressing mold and a lower pressing mold which are arranged opposite to each other.

[0009] The pressing mold is provided with a plurality of accommodating grooves, each of which is used to place a battery;

[0010] A plurality of hot pressing heads are arranged on the upper pressing mold, and the plurality of hot pressing heads correspond one-to-one to the plurality of accommodating grooves. Each of the hot pressing heads is provided with a hot pressing portion and a limiting groove, and the limiting groove is arranged around the hot pressing portion. When the hot pressing shaping operation is performed, the hot pressing portion is hot-pressed against the battery cell, and the opening end of the shell is limited in the limiting groove.

[0011] In one embodiment, the hot pressing head is further provided with a guide portion, and the guide portion is arranged around the outside of the limiting groove, and the opening end of the shell enters the limiting groove along the guide portion.

[0012] In one embodiment, the guide portion is provided with an inclined surface, and the inclined surface is connected to the limiting groove.

[0013] In one embodiment, the inclination angle of the inclined surface is 10°~80°.

[0014] In one embodiment, the inclined surface is a circular arc, an elliptical arc or other irregularly shaped structures that can play a guiding role.

[0015] In one embodiment, the width of the limiting groove exceeds the thickness of the shell by 0.03-0.1 mm.

[0016] In one embodiment, the hot pressing portion has a hot pressing plane, and the shape of the hot pressing plane matches the end face of the battery cell.

[0017] In one embodiment, there is a height difference between the hot pressing plane and the bottom of the limiting groove, and during the hot pressing operation, the opening end of the shell is abutted against the bottom of the limiting groove.

[0018] In one embodiment, the plurality of limiting grooves and the plurality of hot pressing heads are arranged in a one-to-one correspondence and at equal intervals.

[0019] In one embodiment, the thermal compression head adopts an integrally formed structure or a nested detachable structure.

[0020] In one embodiment, the diameter of the accommodating groove is 0.1-1 mm larger than the outer diameter of the shell.

[0021] Compared with the prior art, the utility model has at least the following advantages:

[0022] The utility model proposes an innovative battery end face hot pressing shaping device, the core feature of which is that the hot pressing head is provided with a limit groove structure. During the hot pressing operation, the open end of the battery shell will be precisely limited in the limit groove. This design can overcome the problem of alignment deviation of the upper and lower hot pressing components caused by insufficient processing accuracy or installation errors in the traditional multi-station hot pressing shaping tooling. Through this method, the phenomenon of unsatisfactory hot pressing effect and large differences in hot pressing consistency between hot pressing stations can be significantly reduced. In addition, thanks to the significant improvement of the hot pressing effect by this tooling, the deviation and leakage of the diaphragm edge caused by the substandard hot pressing process can be effectively alleviated, thereby reducing the risk of explosion points during laser sealing welding and the occurrence of adverse phenomena such as battery leakage. The hot pressing shaping tooling provided by the utility model can not only greatly improve the quality of the battery manufacturing process, but also effectively guarantee the safety performance and overall performance of the battery in actual use, laying a solid process foundation for high-quality manufacturing and wide application of the battery industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the continuous structure of the traditional single-sided hot pressing shaping tooling;

[0025] Figure 2 This is a schematic structural diagram of a battery end surface hot pressing and shaping tooling according to one embodiment of the utility model;

[0026] Figure 3 It is a schematic diagram of the single-station structure of a battery end face hot pressing and shaping tooling according to one embodiment of the utility model.

[0027] The numbers in the figure are: 10, battery end face hot pressing shaping tooling; 100, upper pressing mold; 110, hot pressing head; 111, hot pressing part; 1111, hot pressing plane; 112, limiting groove; 113, guide part; 1131, inclined surface; 200, lower pressing mold; 210, accommodating groove; 300, shell; 400, battery cell. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0029] See also Figure 2 and Figure 3 A battery end surface hot pressing shaping tool 10, the battery includes a shell 300 and a battery cell 400, the battery cell 400 is accommodated in the shell 300, including: an upper pressing mold 100 and a lower pressing mold 200 opposed to each other, the lower pressing mold 200 is provided with a plurality of accommodating grooves 210, each accommodating groove 210 is used to place a battery; a plurality of hot pressing heads 110 are arranged on the upper pressing mold 100, and the plurality of hot pressing heads 110 correspond to the plurality of accommodating grooves 210 one by one, each hot pressing head 110 is provided with a hot pressing part 111 and a limiting groove 112, the limiting groove 112 is arranged around the hot pressing part 111, when the hot pressing shaping operation is performed, the hot pressing part 111 is hot-pressed against the battery cell 400, and the open end of the shell 300 is limited in the limiting groove 112.

[0030] It should be noted that the improved battery end face hot pressing shaping tool 10 is mainly used to process battery products including a shell and a battery cell, and the battery cell is packaged in a shell with the open end facing upward. The core structure of the tool includes an upper pressing mold 100 and a lower pressing mold 200 arranged symmetrically from top to bottom. The lower pressing mold 200 is arranged with a plurality of accommodating grooves 210, the purpose of which is to load a single battery to be shaped, respectively, to ensure that the battery can maintain a stable and precise position during the hot pressing process. Among them, the upper pressing mold 100 is equipped with a plurality of hot pressing heads 110 that completely correspond to the number of accommodating grooves 210. Each hot pressing head 110 includes two key parts: a hot pressing part 111 and a limiting groove 112. The limiting groove 112 is arranged around the hot pressing part 111. When performing hot pressing and shaping operations, the hot pressing part 111 acts downward on the battery cell to perform precise hot pressing treatment on it. At this time, the open end of the battery shell is just limited in the limiting groove 112 of the hot pressing head 110, forming a good positioning, which effectively prevents the displacement of the battery position during the hot pressing process. This design not only significantly improves the consistency and accuracy of the hot pressing shaping of the battery end face, but also effectively constrains the open end of the shell by the limiting groove 112, which can minimize the poor contact between the battery cell and the shell, the exposure of the diaphragm, etc. caused by the hot pressing operation, thereby significantly improving the safety performance and overall performance of the battery.

[0031] Furthermore, in practical applications, the linkage between the upper pressing mold 100 and the lower pressing mold 200 can be realized by a hydraulic, pneumatic or electric drive system to ensure the stability and accuracy of the hot pressing shaping process. At the same time, the hot pressing part 111 of the hot pressing head 110 is connected to an external heating source (such as resistance heating, electromagnetic induction heating, etc.) to ensure accurate control of the hot pressing temperature and ideal hot pressing effect.

[0032] See also Figure 2 and Figure 3 Furthermore, the hot pressing head 110 is also provided with a guide portion 113 , which is arranged around the outer side of the limiting groove 112 , and the opening end of the shell enters the limiting groove 112 along the guide portion 113 .

[0033] It should be noted that the main function of the guide portion 113 is to provide a smooth and accurate introduction path for the open end of the battery shell during the hot pressing shaping operation. When the open end of the shell contacts the hot pressing head 110, it can slide into the limit groove 112 step by step and smoothly through the guide portion 113, ensuring that the position of the open end of the shell is accurately controlled during the entire hot pressing process, avoiding the problem of shell damage or uneven hot pressing caused by careless operation or misdirection, thereby improving the stability, safety and production efficiency of the entire hot pressing shaping process.

[0034] See also Figure 2 and Figure 3 Furthermore, the guide portion 113 is provided with an inclined surface 1131 , and the inclined surface 1131 is connected to the limiting groove 112 .

[0035] It should be noted that the design of the inclined surface 1131 allows the opening end of the battery shell to naturally transition along the inclined surface when entering the limiting groove 112, smoothly guiding the opening end of the shell to be accurately positioned, further reducing the risk of damage to the shell, and also making it easier for operators or automated equipment to position and insert.

[0036] See also Figure 2 and Figure 3 Furthermore, the inclination angle J of the inclined surface 1131 is 10°~80°.

[0037] It should be noted that the inclination angle J of the inclined surface 1131 of the guide portion 113 is precisely set between 10° and 80°, preferably between 40° and 60°. If the inclination angle is too small, the guiding effect may not be obvious, and the opening end of the shell may not slide smoothly into the limiting groove 112; while if the angle is too large, excessive pressure may be exerted on the shell, increasing the risk of damage. Therefore, the inclination angle range of 10° to 80° can not only ensure that the opening end of the shell can easily and accurately enter the limiting groove 112, but also minimize the impact force on the shell, thereby ensuring the smoothness and safety of the hot pressing shaping process.

[0038] See also Figure 2 and Figure 3 Furthermore, the inclined surface 1131 is a circular arc, an elliptical arc or other irregular shape structures that can play a guiding role.

[0039] It should be noted that the inclined surface 1131 of the guide portion 113 is not limited to a strict geometric circular or elliptical arc surface, but can also be any irregular shape structure that can play a good guiding role, such as a smoothly transitioned curve, a gradual curved surface, or other geometric shapes that conform to the principles of dynamics and mechanics. This design flexibility enables the hot pressing head 110 to better adapt to the opening ends of battery shells of different shapes and sizes, ensuring that accurate and stable guiding effects can be achieved under various working conditions, so that the opening end of the shell can slide easily and smoothly into the limiting groove 112.

[0040] See also Figure 2 and Figure 3 Furthermore, the width H of the limiting groove 112 exceeds the thickness of the shell by 0.03-0.1 mm.

[0041] It should be noted that the width of the limit groove 112 is designed to be slightly larger than the actual thickness of the battery shell, and the specific excess range is set between 0.03 and 0.1 mm. The main purpose is to provide a moderate gap space for the battery shell during the hot pressing shaping process, which can ensure that the open end of the shell is firmly and stress-freely positioned in the limit groove 112, and the battery will not shake or misalign during hot pressing due to excessive gap. The gap of 0.03 to 0.1 mm can not only meet the requirements of slight deformation of the shell during thermal expansion and contraction, but also ensure that the contact area between the hot pressing head 110 and the shell is maximized, thereby effectively improving the hot pressing efficiency and the quality of battery end face shaping.

[0042] See also Figure 2 and Figure 3 Furthermore, the hot pressing portion 111 has a hot pressing plane 1111, and the shape of the hot pressing plane 1111 matches the end face of the battery cell.

[0043] It should be noted that the hot pressing part 111 of the hot pressing head 110 includes a hot pressing plane 1111 that matches the shape of the end face of the battery cell. The design purpose of the hot pressing plane 1111 is to ensure that during the hot pressing and shaping process, the hot pressing part 111 can fully and evenly contact and transfer pressure with the end face of the battery cell to achieve accurate hot pressing and shaping of the end face of the battery cell. The shape of the hot pressing plane 1111 matches the end face of the battery cell, which means that no matter whether the end face of the battery cell is circular, rectangular or other special shapes, the hot pressing part 111 can perform targeted hot pressing treatment on it, ensuring a close fit between the battery cell and the shell, and improving the overall sealing and performance stability of the battery.

[0044] See also Figure 2 and Figure 3Furthermore, the plurality of limiting grooves 112 and the plurality of hot pressing heads 110 are respectively arranged in a one-to-one correspondence and at equal intervals.

[0045] It should be noted that each limiting groove 112 corresponds to a specific hot pressing head 110, and the spacing between them is the same, so as to ensure that during the hot pressing and shaping process, each battery can be subjected to balanced and consistent pressure and temperature, ensuring the uniformity of the hot pressing and shaping of the battery end face, and improving the consistency and overall performance of the battery; at the same time, the batteries on the same tooling can be hot pressed and shaped at the same time, thereby improving production efficiency.

[0046] See also Figure 2 and Figure 3 Furthermore, there is a height difference between the hot pressing plane 1111 and the bottom of the limiting groove 112. During the hot pressing operation, the opening end of the shell body is abutted against the bottom of the limiting groove 112.

[0047] It should be noted that there is a preset height difference between the hot pressing plane 1111 of the hot pressing part 111 and the bottom of the limiting groove 112. The actual contact distance between the hot pressing plane 1111 and the end face of the battery cell is controlled by the design of the height difference, so as to accurately control the degree of hot pressing applied to the battery cell, that is, the setting of the height difference enables the hot pressing plane 1111 to only perform appropriate hot pressing on the battery cell as needed, avoiding damage to the battery cell or shell caused by excessive hot pressing, and also preventing insufficient hot pressing from affecting battery performance. At the same time, the abutment between the open end of the shell and the bottom of the limiting groove 112, on the one hand, ensures the stability of the shell during the hot pressing process, and on the other hand, it also participates in the hot pressing process in an indirect way, assisting the hot pressing plane 1111 to achieve uniform and safe hot pressing shaping of the battery cell.

[0048] See also Figure 2 and Figure 3 , further, the hot pressing head 110 adopts an integrally formed structure or a nested detachable structure. Among them, when the hot pressing head 110 is an integrally formed structure, the structure is firm and stable, and can ensure that the parameters such as the height difference between the hot pressing plane 1111 and the limiting groove 112 are accurate and correct, while also reducing the assembly links, improving production efficiency and product reliability. When the hot pressing head 110 is a nested detachable structure, the hot pressing head 110 is divided into multiple detachable parts, such as the hot pressing part 111, the guide part 113 and the limiting groove 112, which can be independently designed and manufactured, and then assembled and installed in a nested manner. This structural design has high flexibility, is convenient for the replacement, maintenance and cleaning of parts, and reduces maintenance costs. At the same time, the matching hot pressing part 111 can be replaced according to different battery cell sizes and shapes to meet diversified product needs. No matter which structural design is adopted, it is to better serve the hot pressing shaping operation of the battery end face and ensure the safety of the battery and the stability of its performance.

[0049] See also Figure 2 and Figure 3 Furthermore, the diameter C of the accommodating groove 210 is larger than the outer diameter of the shell by 0.1~1mm.

[0050] It should be noted that the diameter of the receiving groove 210 is slightly larger than the outer diameter of the shell, so that the battery shell can be placed in the receiving groove 210 more easily and smoothly during the hot pressing process, avoiding jamming or damage to the battery shell due to over-tight size; at the same time, in view of the dimensional tolerance in the actual production process, leaving a certain margin can ensure that even a battery shell with a slightly deviated size can be correctly and stably placed in the receiving groove 210, thereby ensuring the accuracy and consistency of hot pressing; further, during the hot pressing process, the battery shell and the internal battery cell may expand slightly due to the increase in temperature, and the appropriate gap can provide sufficient expansion space to avoid deformation or damage to the shell due to excessive pressure caused by thermal expansion. The following is a specific embodiment.

[0051] A button-type cylindrical battery model 5853 was selected. The corresponding core size requirements of the model are height ≤5.3mm and diameter ≤5.47mm. The core height and diameter are too small, and the core cannot be stably clamped to achieve double-sided hot pressing. Therefore, the bottom welding of the negative pole into the shell is selected and then the single-sided hot pressing shaping of the positive terminal surface is performed. The inner diameter N of the 5853 battery cell steel shell is 5.5mm, the outer diameter W of the steel shell is 5.8mm, and the thickness L of the steel shell is 0.15mm. The diameter B of the hot pressing head of the upper pressing mold used is 5.4mm, the width H of the limit groove is 0.2mm, the inclination angle J of the inclined surface is 40°, and the diameter C of the bottom groove of the accommodating groove is 6.2mm.

[0052] The experimental group used the roll core after putting it into the shell Figure 3 The battery end face hot pressing shaping tool provided by the utility model is used for end face shaping hot pressing. The control group uses Figure 1 The hot pressing and shaping tooling of the traditional structure pressure head shown in the figure is used for end face shaping and hot pressing. The height of the cores of the two groups of experiments are screened out according to the process requirements of ≤5.3mm, and then randomly allocated to the two groups for use. There are 128 cores in each group, and 32 cores are hot pressed at each station.

[0053] After hot pressing shaping, the height difference between the diaphragm and the steel shell was measured for the batteries in the experimental group and the control group. The diaphragm height lower than the steel shell after hot pressing was OK, and the diaphragm height higher than the steel shell after hot pressing was NG. Hot pressing qualified rate = number of OK products / number of inputs. The statistical results of the hot pressing qualified rate of the workstation end surface of each experimental group are shown in Table 1:

[0054] Table 1. Statistics of the qualified rate of hot pressing of the end surface of each experimental group

[0055] By comparing the hot pressing qualified rate data of different stations of the same hot pressing structure, it can be seen that the hot pressing qualified rate of each station of the 4-station continuous hot pressing tooling of the traditional structure pressure head varies greatly, the consistency of the hot pressing effect is poor, and only one station has a hot pressing qualified rate of 90%; while the 4-station continuous tooling of the battery end face hot pressing shaping tooling provided by the utility model has a hot pressing qualified rate difference of only 6% between each station, the hot pressing qualified rate is all above 90%, the hot pressing effect is good, the consistency of the hot pressing effect is high, and the comprehensive qualified rate is improved by 44%.

[0056] Therefore, experimental data show that the battery end face hot pressing shaping tooling provided by the utility model can significantly reduce or avoid the problem of poor hot pressing effect and poor hot pressing shaping consistency between hot pressing stations caused by the misalignment of the upper and lower hot pressing mechanisms produced by the continuous multi-station fixture due to insufficient processing or installation precision. The production efficiency and yield of multi-station hot pressing are greatly improved. At the same time, the improvement of hot pressing effect can reduce laser sealing welding explosion points and poor leakage caused by leakage of the diaphragm due to poor hot pressing, providing reliable guarantee for the safe use and performance of button batteries.

[0057] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A battery end surface hot pressing shaping tool, the battery comprising a shell and a battery cell, the battery cell is accommodated in the shell, characterized in that: include: The upper pressing mold and the lower pressing mold are placed opposite each other. The pressing mold is provided with a plurality of accommodating grooves, each of which is used to place a battery; A plurality of hot pressing heads are arranged on the upper pressing mold, and the plurality of hot pressing heads correspond one-to-one to the plurality of accommodating grooves. Each of the hot pressing heads is provided with a hot pressing portion and a limiting groove, and the limiting groove is arranged around the hot pressing portion. When the hot pressing shaping operation is performed, the hot pressing portion is hot-pressed against the battery cell, and the opening end of the shell is limited in the limiting groove.

2. The battery end surface hot pressing shaping tool according to claim 1, characterized in that: The hot pressing head is further provided with a guide portion, which is arranged around the outer side of the limiting groove, and the opening end of the shell enters the limiting groove along the guide portion.

3. The battery end surface hot pressing shaping tool according to claim 2, characterized in that: The guide portion is provided with an inclined surface, and the inclined surface is connected to the limiting groove.

4. The battery end surface hot pressing shaping tool according to claim 3, characterized in that: The inclination angle of the inclined surface is 10° to 80°.

5. The battery end surface hot pressing shaping tool according to claim 3, characterized in that: The inclined surface is a circular arc or elliptical arc shaped structure.

6. The battery end surface hot pressing shaping tool according to claim 1, characterized in that: The width of the limiting groove exceeds the thickness of the shell by 0.03-0.1 mm.

7. The battery end surface hot pressing shaping tool according to claim 1, characterized in that: The hot pressing portion has a hot pressing plane, and the shape of the hot pressing plane matches the end surface of the battery cell.

8. The battery end surface hot pressing shaping tool according to claim 7, characterized in that: There is a height difference between the hot pressing plane and the bottom of the limiting groove. During the hot pressing operation, the opening end of the shell body abuts against the bottom of the limiting groove.

9. The battery end surface hot pressing shaping tool according to claim 1, characterized in that: The plurality of limiting grooves and the plurality of hot pressing heads are arranged in equal intervals in a one-to-one correspondence.

10. The battery end surface hot pressing shaping tool according to claim 1, characterized in that: The diameter of the accommodating groove is 0.1-1 mm larger than the outer diameter of the shell.

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