Battery cell with pressure relief structure and battery module

Abstract

The utility model discloses a battery cell with a pressure relief structure and a battery module, and belongs to the technical field of battery packs. The battery cell with the pressure relief structure comprises a packaging shell, a core package and the pressure relief structure, a containing cavity is formed in the packaging shell, and the core package is installed in the containing cavity. The pressure relief structure comprises a pressure relief piece, an elastic sealing piece and a protection piece, the pressure relief piece is connected to the top end of the packaging shell, the pressure relief piece is provided with a pressure relief hole communicated with the containing cavity, an annular clamping groove is formed between the pressure relief piece and the packaging shell, and the elastic sealing piece is inserted into the annular clamping groove; the inner top wall of the elastic sealing part can abut against the top end face of the pressure relief part to seal and cover the pressure relief hole, the protection part is connected to the top end of the packaging shell and located above the elastic sealing part at intervals, and the protection part is provided with an exhaust hole communicating with the annular clamping groove. The battery cell with the pressure relief structure is simple in structure, relatively low in cost, simple and quick to install, relatively high in working efficiency and relatively high in safety.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack technical field especially, relates to a kind of electric core and battery module with pressure relief structure. BACKGROUND

[0002] At present, as the energy density requirement of electric core is higher and higher, the thickness of the packaging shell of electric core is thinner and thinner;When the gas generated during formation of electric core makes the gas pressure inside the packaging shell rise, resulting in the swelling deformation of the relatively thin packaging shell, the gap between the core package and the packaging shell arranged in the packaging shell becomes larger, and the core package shakes greatly in the packaging shell when the electric core vibrates, thereby causing the deformation or even fracture of the positive and negative electrode pins electrically connected with the core package, and there is a great safety hazard.

[0003] To solve the above problems, a pressure relief structure is usually provided on the packaging shell to discharge the gas generated during normal formation of the electric core to the packaging shell, so as to ensure that the gap between the core package and the packaging shell will not be too large due to the rise of gas pressure, and to avoid the problem of deformation or even fracture of the positive and negative electrode pins, thereby ensuring the use safety of the electric core.

[0004] However, due to the large number of parts of the existing pressure relief structure, the structure of the pressure relief structure is complex, the cost is high, and the installation of the pressure relief structure in the packaging shell is complex and cumbersome, and the work efficiency is low. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing an electric core and battery module with pressure relief structure, which can discharge the gas generated by the core package, ensure high safety, and the pressure relief structure has simple structure, low cost, simple and fast installation and high work efficiency.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The electric core with pressure relief structure comprises:

[0008] A packaging shell is formed with a receiving cavity inside;

[0009] A core package is installed in the receiving cavity;

[0010] The pressure relief structure comprises a pressure relief member, an elastic sealing member and a protective member. The pressure relief member is connected to the top end of the packaging shell. The pressure relief member is provided with a pressure relief hole communicating with the accommodating cavity. An annular clamping groove is formed between the pressure relief member and the packaging shell. The elastic sealing member is inserted into the annular clamping groove. The inner top wall of the elastic sealing member can abut against the top end surface of the pressure relief member to seal and cover the pressure relief hole. The protective member is connected to the top end of the packaging shell and is spaced above the elastic sealing member. The protective member is provided with an exhaust hole communicating with the annular clamping groove.

[0011] As an option, the packaging shell comprises:

[0012] The shell and the top cover are provided on the opening of the top end of the shell to form the accommodating cavity between the shell and the top cover. The top cover is provided with an explosion-proof valve. The pressure relief member and the protective member are respectively connected to the top cover.

[0013] As an option, the battery cell with the pressure relief structure further comprises:

[0014] The insulating sheet has elastic deformation. The insulating sheet is provided on the top cover and above the protective member. The gas discharged from the exhaust hole can be discharged through the gap between the insulating sheet and the top cover.

[0015] As an option, the top cover is provided with a mounting slot. The pressure relief member is annularly arranged in the mounting slot. The annular clamping groove is formed between the pressure relief member and the groove side wall of the mounting slot and the inner bottom groove edge of the mounting slot. The pressure relief hole penetrates the top cover in the thickness direction of the top cover.

[0016] As an option, the annular clamping groove is annularly provided with a limiting member abutting against the groove side wall of the mounting slot. The elastic sealing member is interference-inserted between the outer side wall of the pressure relief member and the limiting member. The end of the elastic sealing member abuts against the inner bottom groove edge of the annular clamping groove.

[0017] As an option, the pressure relief member and the top cover are integrally formed.

[0018] As an option, the elastic sealing member comprises:

[0019] The abutting plate and the annular surrounding plate are connected to the bottom end of the abutting plate. The annular surrounding plate is interference-inserted between the outer side wall of the pressure relief member and the limiting member. The abutting plate can abut against the top end surface of the pressure relief member to seal and cover the pressure relief hole.

[0020] As an option, the abutting plate and the annular surrounding plate are integrally formed.

[0021] As an alternative, the guard is in the form of a circular plate, the outer edge of the guard is provided with a plurality of exhaust holes, and the guard is welded to the mounting slot.

[0022] The battery module comprises an outer shell and a plurality of the above-mentioned battery cells with pressure relief structures, and each battery cell with a pressure relief structure is mounted in the outer shell.

[0023] The battery cell with a pressure relief structure has the advantages that:

[0024] The battery cell with a pressure relief structure has the advantages that: BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a partial exploded structure schematic view of the battery cell with a pressure relief structure provided by the utility model;

[0026] Figure 2 is a cross-sectional enlarged schematic view of the pressure relief structure.

[0027] BRIEF DESCRIPTION OF REFERENCE NUMERALS

[0028] 10 - battery cell with a pressure relief structure;

[0029] 1-Encapsulation housing; 11-Receiving cavity; 12-Housing shell; 121-Opening; 122-Blue film; 13-Top cover; 131-Mounting slot;

[0030] 2-Core package;

[0031] 3-Pressure relief structure; 31-Pressure relief component; 311-Pressure relief hole; 32-Elastic seal; 321-Abutment plate; 322-Annular surround plate; 33-Protective component; 331-Exhaust hole; 34-Annular groove; 35-Limiting component;

[0032] 4-Insulating sheet; 41-First clearance hole; 42-Second clearance hole; 5-Positive terminal; 6-Negative terminal; 7-Positive pin; 8-Negative pin. Detailed Implementation

[0033] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0034] Any feature disclosed in this specification, unless specifically stated otherwise, may be replaced by other equivalent or similar features. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features. Throughout this specification, the same reference numerals indicate the same elements.

[0035] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] This embodiment proposes a battery cell with a pressure relief structure and a battery module including multiple such battery cells with pressure relief structures. The battery module also includes a housing, in which each battery cell with a pressure relief structure is installed, and the battery cells with pressure relief structures are connected to each other by a steel strip.

[0037] Specifically, such as Figure 1 and Figure 2As shown, the battery cell 10 with the pressure relief structure comprises a packaging shell 1, a cell pack 2 and a pressure relief structure 3; wherein, the packaging shell 1 is formed with a receiving cavity 11; the cell pack 2 is installed in the receiving cavity 11; the pressure relief structure 3 comprises a pressure relief piece 31, an elastic sealing piece 32 and a protective piece 33, the pressure relief piece 31 is connected to the top end of the packaging shell 1, the pressure relief piece 31 is provided with a pressure relief hole 311 which is communicated with the receiving cavity 11, an annular clamping groove 34 is formed between the pressure relief piece 31 and the packaging shell 1, the elastic sealing piece 32 is inserted into the annular clamping groove 34, and the inner top wall of the elastic sealing piece 32 can abut against the top end surface of the pressure relief piece 31 to seal and cover the pressure relief hole 311, the protective piece 33 is connected to the top end of the packaging shell 1 and is spaced above the elastic sealing piece 32, and the protective piece 33 is provided with an exhaust hole 331 which is communicated with the annular clamping groove 34. The cell pack 2 can be a square cell pack formed by winding, and the specific structure of the cell pack 2 is not limited here.

[0038] The battery cell 10 with the pressure relief structure in the embodiment changes the specific setting structure of the pressure relief structure 3 compared with the prior art; by making the pressure relief structure 3 comprise the pressure relief piece 31, the elastic sealing piece 32 and the protective piece 33, and providing the pressure relief hole 311 in the pressure relief piece 31 which is communicated with the receiving cavity 11 in the packaging shell 1, forming the annular clamping groove 34 between the pressure relief piece 31 and the packaging shell 1, inserting the elastic sealing piece 32 into the annular clamping groove 34, and making the inner top wall of the elastic sealing piece 32 abut against the top end surface of the pressure relief piece 31 to seal and cover the pressure relief hole 311, connecting the protective piece 33 to the top end of the packaging shell 1 and spacing it above the elastic sealing piece 32, and providing the exhaust hole 331 in the protective piece 33 which is communicated with the annular clamping groove 34; when the cell pack 2 generates gas to make the gas pressure in the receiving cavity 11 rise to the opening pressure, the gas in the receiving cavity 11 can upwardly punch the elastic sealing piece 32 to make the elastic sealing piece 32 elastically deform, so that a gap is generated between the inner top wall of the elastic sealing piece 32 and the top end surface of the pressure relief piece 31, and then the gas in the receiving cavity 11 sequentially passes through the pressure relief hole 311, the gap between the inner top wall of the elastic sealing piece 32 and the top end surface of the pressure relief piece 31, the annular clamping groove 34 and the exhaust hole 331 to be discharged to the outside of the packaging shell 1, which ensures that the gap between the cell pack 2 and the packaging shell 1 will not be too large due to the rise of the gas pressure, and can avoid the problem of deformation or even breakage of the positive and negative electrode pins 8, so as to ensure the use safety of the entire battery cell 10 with the pressure relief structure; and since the pressure relief structure 3 only comprises the pressure relief piece 31, the elastic sealing piece 32 and the protective piece 33, the number of parts of the pressure relief structure 3 is small, so that the structure of the pressure relief structure 3 is simple and the cost is low; and since only the pressure relief piece 31 and the protective piece 33 need to be connected to the packaging shell 1, the installation of the pressure relief structure 3 on the packaging shell 1 is simple and fast, so that the work efficiency is high. The discharge path of the gas in the receiving cavity 11 is specifically as follows Figure 2indicated by arrow A in FIG. 1.

[0039] It is worth mentioning that when the air pressure in the containing cavity 11 is reduced to below the opening air pressure by discharging through the pressure relief structure 3, at this time, the air in the containing cavity 11 has less impact on the elastic seal 32, so that the elastic seal 32 can automatically recover the elastic deformation, so that the inner top wall of the elastic seal 32 re-contacts the top end face of the pressure relief piece 31 to seal cover the pressure relief hole 311, and no longer discharges the gas in the containing cavity 11, ensuring that the gas in the containing cavity 11 can be stably below the opening air pressure; that is, the pressure relief structure 3 in the embodiment can reseal the packaging shell 1 after pressure relief, preventing water vapor and other impurities from entering the containing cavity 11 through the pressure relief hole 311 to damage the core package 2, and better ensuring the use safety and reliability of the entire battery cell 10 with pressure relief structure. Wherein, the opening air pressure needs to be determined according to the specific exhaust condition and specific working condition of the core package 2, and here is not specifically limited.

[0040] The battery module in the embodiment, since it includes the above-mentioned battery cell 10 with pressure relief structure, that is, it can ensure that the gap between the core package 2 and the packaging shell 1 will not be too large due to the increase in air pressure, thereby avoiding the steel belt for connecting the battery cells 10 with pressure relief structure and the shell body being squeezed and broken, and further ensuring the connection stability between the battery cells 10 with pressure relief structure and the structural stability of the shell body, thereby better ensuring the working stability and high reliability of the entire battery module.

[0041] Specifically, as shown in FIG. 1, Figure 1 The packaging shell 1 includes a shell 12 and a top cover 13, the top cover 13 is arranged on the opening 121 at the top end of the shell 12, so that the shell 12 and the top cover 13 are connected with each other to form the above-mentioned containing cavity 11, an explosion-proof valve is arranged on the top cover 13, and the pressure relief piece 31 and the protection piece 33 are connected to the top cover 13, respectively. Wherein, a blue film 122 for insulation protection is arranged on the outer circumferential surface of the shell 12.

[0042] By arranging the explosion-proof valve on the top cover 13, when the core package 2 appears thermal runaway due to accidental circumstances, the gas in the containing cavity 11 can be quickly discharged through the explosion-proof valve, thereby ensuring the safety of the entire battery cell 10 with pressure relief structure when thermal runaway occurs.

[0043] To ensure the insulating and protective function of the top cover, an insulating sheet is usually installed on it. Since the insulating sheet is located above the protective component, vent holes need to be made on the insulating sheet to ensure that the gas discharged from the vent hole of the protective component can be smoothly discharged to the outside of the insulating sheet. This allows the gas from the vent hole to be discharged to the outside of the battery cell with the pressure relief structure. However, since the vent holes are always exposed, dust and other impurities easily accumulate between the vent holes and the exhaust hole, which is not conducive to cleaning. Furthermore, it is difficult to ensure accurate alignment between the vent holes and the exhaust hole, which increases the processing difficulty and cost of the insulating sheet.

[0044] To solve the above problems, such as Figure 1 As shown, the battery cell 10 with a pressure relief structure in this embodiment also includes an insulating sheet 4. The insulating sheet 4 has elastic deformation and is disposed on the top cover 13 and located above the protective member 33. The gas discharged from the vent 331 can press the insulating sheet 4 to produce elastic deformation, so that the gas in the vent 331 can be discharged through the gap between the insulating sheet 4 and the top cover 13, thereby realizing the discharge of the gas in the receiving cavity 11 to the outside of the battery cell 10 with a pressure relief structure. The insulating sheet 4 is used to provide insulation protection for the top cover 13. Among them, the insulating sheet 4 is provided with a first avoidance hole 41 for avoiding the explosion-proof valve.

[0045] By making the insulating sheet 4 elastically deformable, the gas discharged from the vent 331 can press the insulating sheet 4 to produce elastic deformation, thereby creating a gap between the insulating sheet 4 and the top cover 13. This allows the gas discharged from the vent 331 to pass through the gap between the insulating sheet 4 and the top cover 13. On the one hand, this avoids the insulating sheet 4 interfering with the gas discharge from the vent 331, ensuring that the gas from the vent 331 can be smoothly discharged to the outside of the battery cell 10 with the pressure relief structure. On the other hand, it prevents dust and other impurities from accumulating at the vent 331 through the vent holes of the insulating sheet 4, ensuring the cleanliness and aesthetics of the insulating sheet 4 and the top cover 13. Furthermore, it eliminates the need to process vent holes on the insulating sheet 4 that are precisely aligned with the vent 331, reducing the processing difficulty and cost of the insulating sheet 4.

[0046] It is worth noting that when the vent 331 stops venting gas, that is, the gas pressure on the insulating sheet 4 is removed, allowing the insulating sheet 4 to automatically recover its elastic deformation. This allows the insulating sheet 4 to re-adhere tightly to the top cover 13, ensuring the tightness of the fit between the insulating sheet 4 and the top cover 13. This prevents impurities such as moisture from entering the vent 331 through the gap between the insulating sheet 4 and the top cover 13 and damaging the protective component 33, further ensuring the safety and reliability of the entire battery cell 10 with the pressure relief structure.

[0047] Furthermore, such as Figure 1 and Figure 2As shown in the drawings, the mounting slot 131 is arranged in the top cover 13, and the pressure relief member 31 is arranged in the mounting slot 131 in a ring shape, so that the ring-shaped clamping groove 34 is formed between the pressure relief member 31 and the slot side wall of the mounting slot 131 and the inner bottom groove edge of the mounting slot 131, and the pressure relief hole 311 penetrates through the top cover 13 along the thickness direction of the top cover 13, so as to ensure that the pressure relief hole 311 is in communication with the accommodating cavity 11.

[0048] Specifically, as shown in the drawings, the limiting member 35 is arranged in the ring-shaped clamping groove 34 in a ring shape, and the limiting member 35 abuts against the slot side wall of the mounting slot 131. The elastic sealing member 32 is inserted into the ring-shaped clamping groove 34 in an interference fit between the outer side wall of the pressure relief member 31 and the limiting member 35, and the end of the elastic sealing member 32 abuts against the inner bottom groove edge of the ring-shaped clamping groove 34, so that the sealing effect between the elastic sealing member 32 and the ring-shaped clamping groove 34 can be achieved through the interference fit. Figure 2

[0049] By inserting the elastic sealing member 32 into the ring-shaped clamping groove 34 in an interference fit, on the one hand, the sealing effect of the entire elastic sealing member 32 on the pressure relief hole 311 can be better ensured, and on the other hand, the installation stability of the elastic sealing member 32 in the ring-shaped clamping groove 34 can be ensured when there is no gas discharge. The interference amount of the interference fit needs to be determined according to the opening gas pressure and the permanent compression deformation amount of the elastic sealing member 32, which is not limited herein. In this embodiment, the limiting member 35 can be a ring-shaped limiting block.

[0050] Further, as shown in the drawings, the slot side wall of the mounting slot 131 is arranged in an inclined manner, so that the mounting slot 131 has a flared structure. On the one hand, the inclined slot side wall of the mounting slot 131 can provide a guiding effect for the discharge of gas, which is conducive to the rapid discharge of gas through the ring-shaped clamping groove 34 to the exhaust hole 331. On the other hand, after the limiting member 35 is installed, the ring-shaped clamping groove 34 still has a large available space for gas flow, so that the smoothness and reliability of the gas discharge in the ring-shaped clamping groove 34 can be ensured. Here, the specific inclination angle of the slot side wall of the mounting slot 131 is not limited. Figure 2

[0051] Specifically, as shown in the drawings, the pressure relief member 31 and the top cover 13 are in an integral molding structure, that is, the pressure relief member 31 and the top cover 13 are in an integral stamping structure, so that the connection between the top cover 13 and the pressure relief member 31 is simple and stable. In other embodiments, the pressure relief member 31 and the top cover 13 can also be in a split structure, and the pressure relief member 31 is connected to the top cover 13 by welding or other connection methods. Here, the specific molding method and connection method are not limited. Figure 2 Further, as shown in the drawings, the slot side wall of the mounting slot 131 is arranged in an inclined manner, so that the mounting slot 131 has a flared structure. On the one hand, the inclined slot side wall of the mounting slot 131 can provide a guiding effect for the discharge of gas, which is conducive to the rapid discharge of gas through the ring-shaped clamping groove 34 to the exhaust hole 331. On the other hand, after the limiting member 35 is installed, the ring-shaped clamping groove 34 still has a large available space for gas flow, so that the smoothness and reliability of the gas discharge in the ring-shaped clamping groove 34 can be ensured. Here, the specific inclination angle of the slot side wall of the mounting slot 131 is not limited.

[0052] Figure 2 ​​​As shown, the elastic sealing member 32 comprises an abutting plate 321 and an annular surrounding plate 322, the annular surrounding plate 322 is connected to the bottom end of the abutting plate 321, so that the abutting plate 321 and the annular surrounding plate 322 are connected to each other to form a hat-shaped structure; and the annular surrounding plate 322 is inserted into the outer side wall of the pressure relief member 31 and between the limiting member 35, and the abutting plate 321 can abut the top end face of the pressure relief member 31 to seal and cover the pressure relief hole 311.

[0053] Specifically, as shown in Figure 1 and Figure 2 , the abutting plate 321 and the annular surrounding plate 322 are integrally formed, so that the connection between the abutting plate 321 and the annular surrounding plate 322 is simple and stable. In other embodiments, the abutting plate 321 and the annular surrounding plate 322 can also be a split structure, which is not limited here.

[0054] Specifically, the material of the abutting plate 321 and the annular surrounding plate 322 can be rubber material, so that the abutting plate 321 and the annular surrounding plate 322 can be elastically deformed; and the material of the abutting plate 321 and the annular surrounding plate 322 needs to be resistant to electrolyte corrosion, so as to ensure that the abutting plate 321 and the annular surrounding plate 322 can resist corrosion of electrolyte doped in the gas during the gas discharge process, ensure the smoothness of the gas discharge and improve the service life of the entire elastic sealing member 32. In other embodiments, the material of the abutting plate 321 and the annular surrounding plate 322 can also be silica gel material. Here, the material of the abutting plate 321 and the annular surrounding plate 322 is not limited as long as it can achieve the elastic sealing effect.

[0055] Further, as shown in Figure 1 and Figure 2 , the protective member 33 is a circular plate structure, a plurality of the above-mentioned exhaust holes 331 are arranged on the outer edge of the protective member 33, and the protective member 33 is welded to the slot of the installation slot 131, so as to provide a limiting and blocking effect for the abutting plate 321 through the protective member 33, and ensure that the entire elastic sealing member 32 is elastically deformed in the annular clamping groove 34.

[0056] And, as shown in Figure 1 and Figure 2 , a plurality of the above-mentioned exhaust holes 331 are arranged on the outer edge of the protective member 33, so that the gas in the annular clamping groove 34 can be discharged through the plurality of uniformly arranged exhaust holes 331, ensuring the rapidity and uniformity of the gas discharge, and further ensuring the use safety and reliability of the entire battery cell 10 with the pressure relief structure.

[0057] Specifically, as shown in Figure 2As shown, the top end surface of the protection piece 33 is flush with the top end surface of the top cover 13, which on the one hand makes the top end surface of the top cover 13 relatively flat and beautiful in appearance, and on the other hand facilitates the setting of the insulating sheet 4 on the top end surface of the top cover 13 to avoid interference of the protection piece 33 with the setting of the insulating sheet 4.

[0058] Specifically, the material of the protection piece 33 is the same as that of the top cover 13 to facilitate the welding between the protection piece 33 and the top cover 13. In the embodiment, the material of the protection piece 33 and the top cover 13 is aluminum which is relatively low in cost. In other embodiments, the material of the protection piece 33 can be different from that of the top cover 13, which is not limited here.

[0059] Further, as shown, Figure 1 The battery cell 10 with the pressure relief structure further includes a positive pole 5, a negative pole 6, a positive pin 7 and a negative pin 8. The positive pole 5 and the negative pole 6 are spaced apart on the top cover 13, and the second avoiding hole 42 for avoiding the positive pole 5 and the negative pole 6 is provided on the insulating sheet 4. One end of the positive pin 7 is connected to the positive pole 5, and the other end of the positive pin 7 is connected to the cell pack 2 to realize the positive electrical connection between the positive pole 5 and the cell pack 2 through the positive pin 7. One end of the negative pin 8 is connected to the negative pole 6, and the other end of the negative pin 8 is connected to the cell pack 2 to realize the negative electrical connection between the negative pole 6 and the cell pack 2 through the negative pin 8. Here, the working principle of the positive pole 5, the negative pole 6, the positive pin 7 and the negative pin 8 can refer to the working principle of the common battery cell in the prior art, which will not be described in detail here.

[0060] The specific working process of the battery cell 10 with the pressure relief structure in the embodiment is as follows:

[0061] First, when the gas generated by the cell pack 2 makes the gas pressure in the containing cavity 11 rise to the opening pressure, the gas in the containing cavity 11 can upwardly press against the inner top wall of the abutment plate 321, so that the abutment plate 321 and the annular surrounding plate 322 connected thereto are elastically deformed, thereby causing the gap between the inner top wall of the abutment plate 321 and the top end surface of the pressure relief piece 31, the gap between the inner side wall of the annular surrounding plate 322 and the outer side wall of the pressure relief piece 31, the gap between the end of the annular surrounding plate 322 and the inner bottom groove edge of the annular clamping groove 34, and the gap between the outer side wall of the annular surrounding plate 322 and the limiting piece 35, and further causing the gas in the containing cavity 11 to sequentially pass through the pressure relief hole 311, the gap between the inner top wall of the abutment plate 321 and the top end surface of the pressure relief piece 31, the gap between the inner side wall of the annular surrounding plate 322 and the outer side wall of the pressure relief piece 31, the gap between the end of the annular surrounding plate 322 and the inner bottom groove edge of the annular clamping groove 34, the gap between the outer side wall of the annular surrounding plate 322 and the limiting piece 35, the annular clamping groove 34 and the exhaust holes 331 to be discharged to each of the exhaust holes 331.

[0062] At this time, the gas discharged by each exhaust hole 331 punches the insulating sheet 4, so that the insulating sheet 4 is elastically deformed to generate a gap between the insulating sheet 4 and the top cover 13, so that the gas of the exhaust hole 331 is discharged through the gap between the insulating sheet 4 and the top cover 13, so as to realize the discharge of the gas in the containing cavity 11 to the outside of the battery cell 10 with the pressure relief structure.

[0063] Then, when the gas pressure discharged into the containing cavity 11 is reduced to below the opening pressure, at this time, the punching effect of the gas in the containing cavity 11 on the abutting plate 321 is small, so that the abutting plate 321 and the annular surrounding plate 322 automatically restore the elastic deformation, so that the inner top wall of the abutting plate 321 re-abuts on the top end surface of the pressure relief piece 31 to seal the pressure relief hole 311, and the annular surrounding plate 322 re-inserts in the annular clamping groove 34, so that the gas in the containing cavity 11 is no longer discharged; at the same time, the insulating sheet 4 automatically restores the elastic deformation, so that the insulating sheet 4 is tightly attached to the top cover 13 again, so as to ensure the tightness between the insulating sheet 4 and the top cover 13.

[0064] The above is only the preferred embodiment of the present application, for those skilled in the art, according to the idea of the present application, the specific implementation and application range will be changed, the content of the specification should not be understood as the limitation of the present application.

Claims

1. An electrochemical cell having a pressure relief structure, characterized by, include: The encapsulation shell (1) has a receiving cavity (11) formed therein; The core package (2) is installed inside the receiving cavity (11); The pressure relief structure (3) includes a pressure relief component (31), an elastic seal (32), and a protective component (33). The pressure relief component (31) is connected to the top of the encapsulation shell (1). The pressure relief component (31) has a pressure relief hole (311) communicating with the receiving cavity (11). An annular groove (34) is formed between the pressure relief component (31) and the encapsulation shell (1). The elastic seal (32) is inserted into the annular groove (34), and the inner top wall of the elastic seal (32) can abut against the top surface of the pressure relief component (31) to seal and cover the pressure relief hole (311). The protective component (33) is connected to the top of the encapsulation shell (1) and is spaced above the elastic seal (32). The protective component (33) has an exhaust hole (331) communicating with the annular groove (34).

2. The battery cell having a pressure relief structure according to claim 1, wherein, The encapsulation housing (1) includes: The housing (12) and the top cover (13) are provided, the top cover (13) covering the opening (121) at the top of the housing (12) so that the receiving cavity (11) is formed between the housing (12) and the top cover (13). The top cover (13) is provided with an explosion-proof valve, and the pressure relief component (31) and the protective component (33) are respectively connected to the top cover (13).

3. The battery cell having a pressure relief structure of claim 2, wherein, The battery cell with a pressure relief structure also includes: An insulating sheet (4) has elastic deformation. The insulating sheet (4) is disposed on the top cover (13) and located above the protective member (33). The gas discharged from the exhaust hole (331) can be discharged through the gap between the insulating sheet (4) and the top cover (13).

4. The battery cell having a pressure relief structure of claim 2, wherein, The top cover (13) is provided with an installation slot (131), and the pressure relief component (31) is arranged in a ring in the installation slot (131) so that the pressure relief component (31) forms the annular groove (34) between the groove sidewall of the installation slot (131) and the inner bottom groove edge of the installation slot (131), and the pressure relief hole (311) penetrates the top cover (13) along the thickness direction of the top cover (13).

5. The battery cell having a pressure relief structure of claim 4, wherein, The annular groove (34) is provided with a limiting member (35) in an annular shape. The limiting member (35) abuts against the side wall of the mounting slot (131). The elastic seal (32) is inserted into the outer wall of the pressure relief member (31) and the limiting member (35) with an interference fit. The end of the elastic seal (32) abuts against the inner bottom groove edge of the annular groove (34).

6. The battery cell having a pressure relief structure of claim 4, wherein, The pressure relief component (31) and the top cover (13) are integrally formed.

7. The battery cell having a pressure relief structure of claim 5, wherein, The resilient seal (32) includes: An abutment plate (321) and an annular enclosing plate (322) connected to the bottom end of the abutment plate (321), the annular enclosing plate (322) being interference-fitted between the outer sidewall of the pressure relief member (31) and the limiting member (35), and the abutment plate (321) being capable of abutting against the top end face of the pressure relief member (31) to seal and cover the pressure relief hole (311).

8. The battery cell having a pressure relief structure of claim 7, wherein, The abutment plate (321) and the annular enclosing plate (322) are integrally formed.

9. The battery cell having a pressure relief structure of any one of claims 4-8, wherein, The protective member (33) is in a circular plate structure, the outer edge of the protective member (33) is provided with a plurality of exhaust holes (331), and the protective member (33) is welded to the slot opening of the mounting slot (131), and the top end face of the protective member (33) is flush with the top end face of the top cover (13).

10. A battery module, characterized by The application further provides a battery pack comprising an outer shell and a plurality of the battery cells with pressure relief structure as claimed in any one of claims 1-9, each of the battery cells with pressure relief structure being mounted in the outer shell.

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