Cylindrical battery cell

Abstract

The utility model relates to a cylindrical battery cell, including shell, roll core and cap subassembly, the shell is equipped with opening and with the accommodation cavity of opening intercommunication, roll core is provided in the accommodation cavity, the cap subassembly includes cover plate, sealing element and cap body, the cap body is equipped with the cover plate, sealing element and cap body. The cover plate and the cover cap body abut against the two opposite surfaces of the sealing piece respectively, the end, close to the opening, of the shell is bent towards the inner side to form a bent edge, the peripheral side of the shell is sunken inwards to form a groove body, an installation groove is formed between the groove body and the bent edge, and the installation groove is used for installing the sealing piece. And the cover plate and the sealing piece are embedded in the mounting groove so as to seal the shell. Through the synergistic effect of the mounting groove and the cap assembly, the utilization rate of the internal space of the shell is improved, so that the capacity of the battery cell is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field, specifically, relate to a cylindrical battery. BACKGROUND

[0002] The traditional cylindrical battery is mainly composed of a winding core, a cap and a shell with an open end. The cap is arranged at the opening of the shell and is usually made of a plastic layer to seal the shell. However, one significant defect of this design is that the plastic sealing layer is relatively thick. This relatively large thickness not only increases the volume of the cap itself, but also correspondingly reduces the space inside the shell for accommodating the winding core. The thicker the plastic layer, the lower the winding core height, and the lower the effective volume utilization rate of the battery, resulting in a small battery capacity and volume energy density. SUMMARY

[0003] The utility model aims at providing a cylindrical battery, which improves the internal space utilization rate of the shell through the synergistic effect of the installation groove and the cap assembly, thereby effectively improving the battery capacity.

[0004] A cylindrical battery includes a shell, a winding core and a cap assembly. The shell is provided with an opening and a receiving cavity communicating with the opening. The winding core is arranged in the receiving cavity. The cap assembly includes a cover plate, a sealing element and a cap body. The cover plate and the cap body abut the two surfaces of the sealing element, respectively. One end of the shell near the opening is bent inward to form a bent edge. The outer circumferential side of the shell is inwardly recessed to form a groove. An installation groove is formed between the groove and the bent edge. The cover plate and the sealing element are embedded in the installation groove to seal the shell.

[0005] In the above technical solution, the cover plate and the sealing element are embedded in the installation groove of the shell to form a sealing structure, which does not need to rely on a thick plastic layer to ensure the sealing of the shell. This design not only maintains the compactness of the battery structure, but also effectively prevents the leakage of electrolyte or other harmful substances, thereby improving the safety and reliability of the battery. The installation groove provides a compact installation space for the cover plate and the sealing element, allowing them to be more closely attached to the shell. The cover plate, the sealing element and the cap body abut each other, thereby reducing the space occupied by the cap assembly. Due to the close fit of the cap assembly and the shell, the space inside the shell is more effectively utilized, which helps to increase the capacity or size of the winding core, thereby improving the energy density and performance of the battery. The utility model improves the internal space utilization rate of the shell through the synergistic effect of the installation groove and the cap assembly, thereby effectively improving the battery capacity.

[0006] Further, the cover plate is provided with a first through hole, the sealing element is provided with a second through hole opposite to the first through hole, the cap body includes a body part and a boss extending outward from the middle part of the body part, the body part abuts against the sealing element, and the boss sequentially passes through the second through hole and the first through hole.

[0007] In the above technical solution, the design of the boss can serve as a connection point between the battery cell and the external circuit. Through the boss, the battery cell can be more conveniently connected with the external circuit to realize the transmission of electric current. This design optimizes the electrical performance of the battery cell and improves the efficiency and stability of current transmission.

[0008] Further, the side of the sealing element away from the cover plate is provided with a recessed area, and the body part extends into the recessed area to abut against the sealing element.

[0009] In the above technical solution, after the body part of the cap body extends into the recessed area, an additional support point is formed between the body part and the sealing element, which helps to enhance the overall structural stability of the cap assembly. When the battery cell is subjected to external force impact or vibration, this design can provide better buffering and support to prevent damage to the internal structure of the battery cell.

[0010] Further, the diameter of the recessed area is greater than the diameter of the body part.

[0011] In the above technical solution, when the battery cell is subjected to external impact or pressure, the body part of the cap body may be deformed due to extrusion. If the diameter of the recessed area is large enough, it can accommodate the deformation of the body part without damaging the close fit between the body part and the sealing element, thereby improving the explosion-proof performance of the cap body.

[0012] Further, a connecting piece connected with the boss is also provided, and the connecting piece is used to connect with the external circuit.

[0013] In the above technical solution, the connecting piece is directly connected with the boss, providing a convenient electrical connection channel for the battery cell and the external circuit. This design simplifies the connection process between the battery cell and the external circuit, reducing the connection difficulty and cost.

[0014] Further, a first insulating piece is also included, one side of the first insulating piece abuts against the shell, and the other side abuts against one end of the winding core close to the opening.

[0015] In the above technical solution, the main function of the first insulating piece is to provide electrical isolation to prevent short circuit between the shell and the winding core.

[0016] Further, the first insulating piece is provided with a third through hole, the winding core is provided with a positive electrode connecting piece at one end close to the opening, and the positive electrode connecting piece passes through the third through hole to connect with the cap body.

[0017] In the above technical solution, the design of the third through hole makes it easier for the positive electrode connecting piece to pass through the first insulating piece and connect with the cap body, ensuring efficient transmission of electric energy from the winding core to the external circuit.

[0018] Further, the first insulating piece is also provided with a plurality of heat dissipation holes.

[0019] In the above technical solution, the excess heat is dissipated through the heat dissipation holes, which can maintain the uniformity and stability of the internal temperature of the battery, help to prolong the service life of the battery, and improve its performance in various environmental conditions.

[0020] Further, a second insulating piece is also included, which abuts against the end of the winding core away from the opening.

[0021] In the above technical solution, the design of the second insulating piece allows the end of the winding core away from the opening to be insulatedly connected with the shell.

[0022] Further, the second insulating piece is provided with a fourth through hole, and the end of the winding core away from the opening is provided with a negative electrode connecting piece, which passes through the fourth through hole and connects with the shell.

[0023] In the above technical solution, the design of the fourth through hole makes it easier for the negative electrode connecting piece to pass through the second insulating piece and connect with the shell, simplifying the assembly process of the battery, reducing the assembly cost and time, and improving the production efficiency.

[0024] Compared with the prior art, the beneficial effects of the utility model are: through the design of the installation groove, the cover plate and the sealing element in the cap assembly can be embedded into the installation groove, thereby sealing the shell. The mutual abutment of the cover plate, the sealing element and the cap body makes the space inside the shell more effectively utilized, which helps to increase the capacity or size of the winding core, thereby improving the energy density and performance of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a perspective view of the shell of the utility model embodiment.

[0026] Figure 2 It is a cross-sectional view of the cylindrical battery cell of the utility model embodiment.

[0027] Figure 3 It is a partial enlarged view of Figure 2 .

[0028] Figure 4 It is an exploded view of the cap assembly of the utility model embodiment.

[0029] Figure 5The structure diagram of the first insulating piece of the embodiment of the utility model.

[0030] Figure 6 The structure diagram of the second insulating piece of the embodiment of the utility model.

[0031] Figure 7 The perspective view of the cap assembly of the embodiment of the utility model.

[0032] Explanation of reference numerals

[0033] 1, shell; 101, opening; 102, accommodating cavity; 103, bent edge; 104, groove; 105, mounting groove;

[0034] 2, roll core; 201, positive electrode connecting piece; 202, negative electrode connecting piece;

[0035] 3, cap assembly; 301, cover plate; 3011, first through hole; 302, sealing piece; 3021, second through hole; 3022, recessed area; 303, cap body; 3031, body part; 3032, boss;

[0036] 4, connecting piece;

[0037] 5, first insulating piece; 501, third through hole; 502, heat dissipation hole;

[0038] 6, second insulating piece; 601, fourth through hole. DETAILED DESCRIPTION

[0039] The cylindrical battery cell of the utility model will be described in further detail below in conjunction with specific embodiments and drawings. The preferred embodiment of the utility model is shown in the drawings. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein.

[0040] Please refer to Figures 1 to 3 In a preferred embodiment, the cylindrical battery cell of the utility model comprises a shell 1, a roll core 2 and a cap assembly 3, the shell 1 is provided with an opening 101 and an accommodating cavity 102 in communication with the opening 101, the roll core 2 is arranged in the accommodating cavity 102, the cap assembly 3 comprises a cover plate 301, a sealing piece 302 and a cap body 303, the cover plate 301 and the cap body 303 abut the two surfaces of the sealing piece 302 respectively, one end of the shell 1 near the opening 101 is bent towards the inside to form a bent edge 103, the outer circumferential side of the shell 1 is recessed inward to form a groove 104, a mounting groove 105 is formed between the groove 104 and the bent edge 103, the cover plate 301 and the sealing piece 302 are embedded in the mounting groove 105 to seal the shell 1.

[0041] In practical applications, the cover plate 301 and the sealing element 302 are embedded in the mounting groove 105 of the shell 1 to form a sealing structure, without relying on a thick plastic layer to ensure the sealing of the shell 1. This design not only maintains the compactness of the battery cell structure, but also effectively prevents the leakage of electrolyte or other harmful substances, thereby improving the safety and reliability of the battery cell. The mounting groove 105 provides a compact mounting space for the cover plate 301 and the sealing element 302, allowing them to be more closely attached to the shell. The cover plate 301, the sealing element 302, and the cap body 303 abut each other, thereby reducing the space occupied by the cap assembly 3. Due to the close fit of the cap assembly 3 and the shell 1, the space inside the shell 1 is more effectively utilized, which helps to increase the capacity or size of the winding core 2, thereby improving the energy density and performance of the battery cell. The present application improves the utilization of the internal space of the shell 1 through the cooperation of the mounting groove 105 and the cap assembly 3, effectively improving the capacity of the battery cell.

[0042] Please refer to Figures 2 to 4 The cover plate 301 is provided with a first through hole 3011, and the sealing element 302 is provided with a second through hole 3021 opposite to the first through hole 3011. The cap body 303 includes a body portion 3031 and a boss 3032 extending outward from the middle portion of the body portion 3031. The body portion 3031 abuts the sealing element 302, and the boss 3032 passes through the second through hole 3021 and the first through hole 3011 in sequence. The design of the boss 3032 can serve as a connection point between the battery cell and the external circuit. Through the boss 3032, the battery cell can be more conveniently connected to the external circuit to realize the transmission of current. This design optimizes the electrical performance of the battery cell and improves the efficiency and stability of current transmission.

[0043] Please refer to Figure 3 and Figure 4 The side of the sealing element 302 away from the cover plate 301 is provided with a recessed area 3022, and the body portion 3031 extends into the recessed area 3022 to abut the sealing element 302. After the body portion 3031 extends into the recessed area 3022, an additional support point is formed between the body portion 3031 and the sealing element 302, which helps to enhance the overall structural stability of the cap assembly 3. When the battery cell is subjected to external force impact or vibration, this design can provide better buffering and support, preventing damage to the internal structure of the battery cell. At the same time, the provision of the recessed area 3022 can provide sufficient mounting space for the cap body 303 without increasing the overall size of the battery cell, which helps to optimize the spatial layout inside the battery cell and improve the space utilization, while maintaining the compactness and light weight of the battery cell.

[0044] It should be noted that the diameter of the recessed area 3022 is larger than the diameter of the body part 3031. When the battery cell is subjected to external impact or pressure, the body part 3031 may be deformed due to extrusion. If the diameter of the recessed area 3022 is large enough, it can accommodate such deformation of the body part 3031 without causing the tight fit between the body part 3031 and the seal 302 to be destroyed, improving the explosion-proof performance of the cap body 303. At the same time, as the recessed area 3022 provides deformation space for the body part 3031, this design can reduce the stress and strain of the body part 3031 when subjected to impact or pressure, helping to reduce the degree of fatigue damage and wear of the cap body 303, thereby prolonging the service life of the battery cell.

[0045] Further, the utility model still is equipped with the connecting piece 4 connected with the boss 3032, and the connecting piece 4 is used for connecting with external circuit. The connecting piece 4 is directly connected with the boss 3032, and convenient electrical connection passage is provided for the battery cell and external circuit. This design simplifies the connection process of the battery cell and external circuit, and reduces the connection difficulty and cost. It should be noted that the connection between the connecting piece 4 and the boss 3032 is usually realized by welding, pressure welding or other reliable connection mode, which ensures that the connection between the battery cell and external circuit is stable and reliable. Even in harsh environments, such as high temperature, vibration or humidity, etc. Under such conditions, this connection can maintain good electrical performance.

[0046] Please refer to Figure 2 The utility model also includes first insulating piece 5, one side of first insulating piece 5 is abutted with shell 1, and the other side is abutted with the one end of roll core 2 close to opening 101. The main function of first insulating piece 5 is to provide electrical isolation to prevent short circuit between shell 1 and roll core 2. By isolating shell 1 and roll core 2, first insulating piece 5 can also protect the components inside the battery from external impact and damage. During the battery assembly process, the use of first insulating piece 5 can simplify the assembly steps and improve the assembly efficiency. For example, some designs allow the cover plate, first insulating piece 5 and other components to be pre-assembled into a part, and then put into the shell as a whole, thereby simplifying the assembly process.

[0047] Please refer to Figure 2 And Figure 5 First insulating piece 5 is provided with third through hole 501, and the one end of roll core 2 close to opening 101 is provided with positive electrode connecting piece 201, and positive electrode connecting piece 201 passes through third through hole 501 and is connected with cap body 303. The design of third through hole 501 makes positive electrode connecting piece 201 can pass through first insulating piece 5 more easily and be connected with cap body 303, ensuring efficient transmission of electric energy from roll core to external circuit.

[0048] Further, the first insulating piece 5 is also provided with a plurality of heat dissipation holes 502. Through the heat dissipation holes 502, the excess heat can be dissipated, the uniformity and stability of the internal temperature of the battery can be maintained, the service life of the battery can be prolonged, and the performance of the battery under various environmental conditions can be improved.

[0049] Please refer to Figure 2 Further comprising a second insulating piece 6, the second insulating piece 6 is in abutment with the end of the roll core 2 away from the opening 101. The design of the second insulating piece 6 can make the end of the roll core 2 away from the opening 101 be insulatedly connected with the shell 1.

[0050] Please refer to Figure 2 And Figure 6 The second insulating piece 6 is provided with a fourth through hole 601, and the end of the roll core 2 away from the opening 101 is provided with a negative electrode connecting piece 202, the negative electrode connecting piece 202 passes through the fourth through hole 601 and is connected with the shell 1. The design of the fourth through hole 601 makes the negative electrode connecting piece 202 can pass through the second insulating piece 6 more easily and be connected with the shell 1, simplifies the assembly process of the battery, reduces the assembly cost and time, and improves the production efficiency.

[0051] In the description of the utility model, it is to be understood that the orientation or positional relationship indicated by terms such as ''up'', ''down'', ''front'', ''back'', ''left'', ''right'', ''vertical'', ''horizontal'', ''top'', ''bottom'', ''inner'', ''outer'' and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0052] In addition, the terms ''first'' and ''second'' are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as ''first'' and ''second'' can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of ''a plurality of'' is two or more, unless otherwise specifically limited.

[0053] In the utility model, unless otherwise specifically specified and limited, the terms ''installation'', ''connection'', ''connection'', ''fixing'' and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0054] Although the description of the utility model is combined with above specific embodiment, but, personnel familiar with this technical field can carry out many substitutions, modification and change according to the above content, it is obvious. Therefore, all such alternatives, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A cylindrical cell, characterized by, The application relates to a shell, a roll core and a cap assembly, the shell is provided with an opening and a containing cavity in communication with the opening, the roll core is arranged in the containing cavity, the cap assembly comprises a cover plate, a sealing element and a cap body, the cover plate and the cap body are respectively in contact with two surfaces of the sealing element, one end of the shell near the opening is bent towards the inside to form a bent edge, the outer periphery of the shell is inwardly recessed to form a groove, an installation groove is formed between the groove and the bent edge, the cover plate and the sealing element are embedded in the installation groove to seal the shell.

2. The cylindrical cell of claim 1, wherein, The cover plate is provided with a first through hole, the sealing element is provided with a second through hole opposite to the first through hole, the cap body comprises a body part and a boss extending outward from the middle part of the body part, the body part is in contact with the sealing element, and the boss passes through the second through hole and the first through hole in sequence.

3. The cylindrical cell of claim 2, wherein, The side of the sealing element away from the cover plate is provided with a recessed area, the body part extends into the recessed area to be in contact with the sealing element.

4. The cylindrical cell of claim 3, wherein, The diameter of the recessed area is larger than the diameter of the body part.

5. The cylindrical cell of claim 2, wherein, A connecting element connected with the boss is further arranged, and the connecting element is used for connecting with an external circuit.

6. The cylindrical cell of claim 1, wherein, A first insulating element is further arranged, one side of the first insulating element is in contact with the shell, and the other side is in contact with one end of the roll core near the opening.

7. The cylindrical cell of claim 6, wherein, The first insulating element is provided with a third through hole, the roll core is provided with a positive electrode connecting piece at one end near the opening, and the positive electrode connecting piece is connected with the cap body by passing through the third through hole.

8. The cylindrical cell of claim 6, wherein, The first insulating element is further provided with a plurality of heat dissipation holes.

9. The cylindrical cell of claim 1, wherein, A second insulating element is further arranged, and the second insulating element is in contact with one end of the roll core away from the opening.

10. The cylindrical cell of claim 9, wherein, The second insulating element is provided with a fourth through hole, the roll core is provided with a negative electrode connecting piece at one end away from the opening, and the negative electrode connecting piece is connected with the shell by passing through the fourth through hole.

Images