Battery monomer, battery pack and electric equipment

Abstract

The embodiment of the invention provides a battery monomer, a battery pack and electric equipment. The battery monomer comprises a shell, an accommodating space, an electrode assembly and a liquid injection module, the housing includes a first wall. The accommodating space is arranged in the battery monomer, and the accommodating space is coated by the shell. The electrode assembly is arranged in the accommodating space. The liquid injection module comprises a liquid injection base, a sealing nail and a cover plate. The liquid injection base is arranged on the first wall, the liquid injection base is provided with an inner surface and an outer surface which are opposite in the thickness direction of the first wall, the liquid injection base is provided with a liquid injection hole, and the liquid injection hole extends to the inner surface of the liquid injection base and communicates with the containing space. And the sealing nail is inserted into the liquid injection hole. The cover plate is detachably installed on the liquid injection base and located on the side, away from the containing space, of the sealing nail in the thickness direction of the first wall. Therefore, after the cover plate is detached, the sealing nails are pulled out of the liquid injection holes, and liquid can be continuously supplemented to the single batteries through the liquid injection holes.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of batteries, and in particular to a battery monomer, a battery pack and an electric device. BACKGROUND

[0002] Liquid injection is a key process in battery manufacturing, in which electrolyte is quantitatively injected into a battery monomer. The injection amount, infiltration effect and injection precision need to be controlled to form ion channels and ensure the migration of metal ions between the positive and negative electrodes during charging and discharging.

[0003] In the related art, the injection hole of the battery monomer is generally sealed by welding a sealing pin after the injection is completed. Although this type of sealing can ensure good sealing of the corresponding battery monomer, in the case of insufficient electrolyte at the end of the service life of the battery monomer, the battery monomer cannot be continuously supplemented with liquid through the injection hole due to the welding sealing. SUMMARY

[0004] Embodiments of the present application provide a battery monomer, a battery pack and an electric device, which improve the problem that the battery monomer cannot be continuously supplemented with liquid.

[0005] In a first aspect, embodiments of the present application provide a battery monomer. The battery monomer includes a housing, a containing space, an electrode assembly and a liquid injection module. The housing includes a first wall. The containing space is arranged inside the battery monomer and is covered by the housing. The electrode assembly is arranged in the containing space. The liquid injection module includes a liquid injection base, a sealing pin and a cover plate. The liquid injection base is arranged on the first wall and has opposite inner and outer surfaces in the thickness direction of the first wall. The liquid injection base is provided with an injection hole extending to the inner surface of the liquid injection base and communicating with the containing space. The sealing pin is inserted into the injection hole. The cover plate is detachably mounted on the liquid injection base and is located on the side of the sealing pin away from the containing space in the thickness direction of the first wall.

[0006] In the above technical solution, the sealing pin is arranged in the injection hole, and the cover plate is detachably mounted on the liquid injection base, so that the sealing pin seals the injection hole and the cover plate prevents the sealing pin from being separated from the injection hole, thereby reducing the risk of leakage of the electrolyte inside the battery monomer from the injection hole. When the electrolyte inside the battery monomer is insufficient, the cover plate can be removed and the sealing pin can be pulled out of the injection hole, so that the battery monomer can be continuously supplemented with liquid through the injection hole, thereby prolonging the service life of the battery monomer.

[0007] In some embodiments, the liquid injection base is provided with a groove recessed from the outer surface of the liquid injection base towards the inner surface of the liquid injection base, and the injection hole communicates the groove and the containing space.

[0008] In the technical scheme, the groove and the accommodating space are communicated through the liquid injection hole, so that when the battery monomer overflows during the liquid injection process, the overflowed electrolyte can be stored in the groove, which is beneficial to the unified cleaning of the overflowed electrolyte in the groove after the liquid injection is completed, and is beneficial to reducing the risk of electrolyte overflow to the shell.

[0009] In some embodiments, at least part of the cover plate is accommodated in the groove.

[0010] In the technical scheme, at least part of the cover plate is accommodated in the groove, so that the cover plate can be matched and installed with the groove, which is beneficial to the sealing of the groove by the cover plate.

[0011] In some embodiments, a first limiting part is arranged on the groove wall surface of the groove, the cover plate is located on the side of the inner surface of the liquid injection base away from the first limiting part, and abuts against the first limiting part.

[0012] In the technical scheme, the cover plate abuts against the first limiting part, so that the first limiting part limits the depth of the cover plate accommodated in the groove, which is beneficial to the sealing of the groove by the cover plate.

[0013] In some embodiments, the liquid injection module further comprises a locking piece, the cover plate is provided with a mounting hole, and the locking piece passes through the mounting hole and is locked to the first limiting part.

[0014] In the technical scheme, the locking piece passes through the mounting hole and is locked to the first limiting part, so that the cover plate is detachably installed on the liquid injection base, which is beneficial to the continuous liquid supplementing of the battery monomer.

[0015] In some embodiments, the groove wall surface comprises a groove bottom surface, the liquid injection base comprises a protruding part protruding from the groove bottom surface, the protruding part is located on the side of the inner surface of the liquid injection base facing the cover plate, the liquid injection hole penetrates the inner surface of the liquid injection base and one end of the protruding part away from the groove bottom surface. The sealing pin comprises a first sealing part and a second sealing part connected in sequence, the first sealing part is inserted into the liquid injection hole, at least part of the second sealing part is located between the protruding part and the cover plate, and the protruding part and the cover plate cooperate to clamp the second sealing part.

[0016] In the technical scheme, the liquid injection hole penetrates the inner surface of the liquid injection base and one end of the protruding part away from the groove bottom surface, and the first sealing part is inserted into the liquid injection hole, so that the sealing pin realizes the basic sealing of the liquid injection hole, which is beneficial to the sealing of the liquid injection hole by the sealing pin. At least part of the second sealing part is located between the protruding part and the cover plate, and the protruding part and the cover plate cooperate to clamp the second sealing part, so that the protruding part and the cover plate compress the second sealing part, the second sealing part makes it difficult for the first sealing part to be separated from the liquid injection hole, and the sealing of the liquid injection hole by the sealing pin is further improved on the basis of the basic sealing.

[0017] In some embodiments, the compression amount of the second sealing portion along the thickness direction of the first wall is H, and 0.5mm≤H≤2mm.

[0018] In the above technical solution, by setting the compression amount H of the second sealing portion to be not less than 0.5mm, the sealing nail satisfies the basic sealing property to the liquid injection hole, which is beneficial to reduce the risk of electrolyte flowing out of the liquid injection hole. By setting the compression amount H of the second sealing portion to be not more than 2mm, the risk of causing excessive pressure to the sealing cover plate is reduced, which is beneficial to improve the use durability of the sealing cover plate.

[0019] In some embodiments, the sealing nail comprises a third sealing portion, the third sealing portion is protruded on the surface of the second sealing portion facing the protruding portion along the thickness direction of the first wall, the third sealing portion is annular structure, and the third sealing portion is arranged around the protruding portion and abuts against the outer circumferential surface of the protruding portion.

[0020] In the above technical solution, by setting the third sealing portion to be arranged around the protruding portion and abutting against the outer circumferential surface of the protruding portion, the first sealing portion, the second sealing portion and the third sealing portion jointly form an inverted "mountain" shape structure, so that the liquid injection hole, the sealing nail and the cover plate are tightly matched, which is beneficial to form good sealing effect of the sealing nail to the liquid injection hole and good fixing effect of the cover plate to the sealing nail.

[0021] In some embodiments, the size of the third sealing portion along the thickness direction of the first wall is H1, and H1≥1mm.

[0022] In the above technical solution, by setting the size of the third sealing portion to be not less than 1mm, it is difficult for the electrolyte to flow out along the hole wall of the liquid injection hole, which is beneficial to form good sealing effect of the sealing nail to the liquid injection hole.

[0023] In some embodiments, a second limiting portion is arranged on the surface of the cover plate facing the protruding portion along the thickness direction of the first wall, the second limiting portion is annular structure, and the second limiting portion is arranged around the second sealing portion.

[0024] In the above technical solution, by setting the second limiting portion to be arranged around the second sealing portion, the relative position of the second sealing portion to the cover plate after compression is limited, which is beneficial to reduce the deviation of the second sealing portion after compression, improve the fixing effect of the cover plate to the sealing nail, and improve the sealing effect of the sealing nail to the liquid injection hole.

[0025] In some embodiments, the size of the second limiting portion along the thickness direction of the first wall is H2, and H2≥1mm.

[0026] In the above technical solution, by setting the size of the second limiting portion to be not less than 1mm, the second sealing portion can not deviate after compression, which is beneficial to improve the fixing and sealing effect.

[0027] In some embodiments, the shell further comprises a second wall, the second wall is arranged adjacent to the first wall, and the liquid injection base is adjacent to the second wall. The battery cell further comprises an electrode terminal, the electrode terminal is arranged on the second wall and electrically connected with the electrode assembly.

[0028] In the above technical solution, the electrode terminal is arranged on the second wall, and the liquid injection base is arranged on the first wall and adjacent to the second wall, wherein the first wall and the second wall are arranged adjacent to each other, so that the electrode terminal and the liquid injection base are arranged on different walls of the shell, which helps to reduce the risk of electrolyte flowing to the electrode terminal during the liquid injection process of the battery cell.

[0029] In some embodiments, the first wall is integrally formed with the liquid injection base, or the first wall and the liquid injection base are separately arranged, the first wall is provided with a through hole, and the liquid injection base is inserted into the through hole and sealingly connected with the first wall.

[0030] In the above technical solution, by integrally forming the first wall with the liquid injection base, or by arranging the through hole on the first wall and sealingly connecting the liquid injection base, the outer surface of the liquid injection base is sealed with the shell, which helps to improve the sealing performance of the battery cell.

[0031] In the above technical solution, by integrally forming the first wall with the liquid injection base, or by arranging the through hole on the first wall and sealingly connecting the liquid injection base, the outer surface of the liquid injection base is sealed with the shell, which helps to improve the sealing performance of the battery cell.

[0032] In the above technical solution, by electrically connecting the plurality of battery cells, the plurality of battery cells can be connected according to the power demand, which helps to improve the applicability of the battery cell.

[0033] In the above technical solution, by electrically connecting the plurality of battery cells, the plurality of battery cells can be connected according to the power demand, which helps to improve the applicability of the battery cell.

[0034] In the above technical solution, by arranging the battery pack in the power consumption equipment, the battery pack and the power consumption equipment form a closed loop, which helps to convert and circulate energy. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The structural schematic diagram of the vehicle provided by some embodiments of the present application; Figure 2 The exploded view of the battery pack provided by some embodiments of the present application; Figure 3 The top view of the battery cell provided by some embodiments of the present application; Figure 4 The top view of the battery cell provided by some embodiments of the present application; Figure 3 The sectional view of A-A (without groove) in the middle; Figure 5 The exploded view of the battery cell provided by some embodiments of the present application; Figure 6 is a partial enlarged view of W1 in the middle; Figure 5 is a partial enlarged view of W1 in the middle; Figure 7 is a sectional view of the liquid injection module provided by some embodiments of the present application; Figure 8 is a sectional view of the liquid injection module provided by some embodiments of the present application; Figure 9 is a sectional view of the liquid injection module provided by some embodiments of the present application (without the third sealing part); Figure 10 is a sectional view of the liquid injection module provided by some embodiments of the present application (with the third sealing part); Figure 11 is a partial enlarged view of W2 in the middle; Figure 10 is a partial enlarged view of W2 in the middle;

[0036] Explanation of reference signs: 10000 - electric device; 1000 - battery pack; 100 - battery cell; 10 - shell; 11 - containing space; 12 - first wall; 121 - through hole; 13 - second wall; 14 - housing; 15 - end cover; 20 - electrode assembly; 30 - liquid injection module; 31 - liquid injection base; 311 - inner surface of the liquid injection base; 312 - outer surface of the liquid injection base; 313 - liquid injection hole; 314 - groove; 3141 - first limiting part; 3142 - groove bottom surface; 315 - protruding part; 32 - sealing pin; 321 - first sealing part; 322 - second sealing part; 323 - third sealing part; 33 - cover plate; 331 - mounting hole; 332 - second limiting part; 34 - locking member; 40 - electrode terminal; 200 - box body; 201 - upper box body; 202 - lower box body. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects solved by the present application clearer, the present application will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0038] The electric device 10000 provided by the embodiments of the present application can be a mobile phone, a notebook computer, an electric vehicle, a vehicle, etc. The following embodiments take the vehicle as an example for convenience of description. Please refer to Figure 1 , Figure 1 is a structural schematic view of the vehicle provided by some embodiments of the present application. The vehicle is internally provided with a battery pack, which can be used for power supply of the vehicle and can serve as a power battery of the vehicle.

[0039] The vehicle can also include a controller and an electric motor, the controller being configured to control the supply of power to the electric motor, for example, for the power requirements of the vehicle for starting, navigation, and operation while traveling.

[0040] Please refer to Figure 2 , Figure 2 An exploded view of a battery pack is provided for some embodiments of the present application. The battery pack 1000 can include a battery cell 100 and a box 200, the battery cell 100 being housed in the box 200.

[0041] The box 200 can include an upper box 201 and a lower box 202, the upper box 201 and the lower box 202 being coupled to each other. The upper box 201 and the lower box 202 can be in various shapes, such as a cuboid, a cylinder, etc. In the battery pack 1000, the battery cell 100 can be one or more. If the battery cell 100 is more than one, the plurality of battery cells 100 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the plurality of battery cells 100 are connected in series and in parallel.

[0042] Please refer to Figure 3 and Figure 4 , Figure 3 A top view of a battery cell is provided for some embodiments of the present application, Figure 4 is Figure 3 A cross-sectional view of A-A in FIG. 1 (without recess). Embodiments of the present application provide a battery cell 100, the battery cell 100 including a housing 10, a containing space 11, an electrode assembly 20, and a liquid injection module 30. The housing 10 includes a first wall 12. The containing space 11 is disposed inside the battery cell 100, the containing space 11 being covered by the housing 10. The electrode assembly 20 is disposed in the containing space 11. The liquid injection module 30 includes a liquid injection base 31, a sealing pin 32, and a cover plate 33. The liquid injection base 31 is disposed on the first wall 12, the liquid injection base 31 having opposite inner and outer surfaces 311 and 312 of the liquid injection base in a thickness direction of the first wall 12, the liquid injection base 31 being provided with a liquid injection hole 313 extending to the inner surface 311 of the liquid injection base and communicating with the containing space 11. The sealing pin 32 is inserted into the liquid injection hole 313. The cover plate 33 is detachably mounted to the liquid injection base 31, the cover plate 33 being located on a side of the sealing pin 32 away from the containing space 11 in the thickness direction of the first wall 12.

[0043] The shell 10 can be used to accommodate components such as the electrode assembly 20 and electrolyte. The shell 10 includes a shell body 14 and an end cover 15. The shell body 14 can have an opening at one end, or can have openings at both opposite ends. The shell body 14 can have various shapes, such as a cylindrical shape, a cuboid shape, etc. The end cover 15 is a component that closes the opening of the shell body 14 to isolate the internal environment of the battery monomer 100 from the external environment. The end cover 15 cooperates with the shell body 14 to define an accommodation space 11 for accommodating the electrode assembly 20, electrolyte, and other components. The shell 10 can be a metal material, such as steel, aluminum, aluminum alloy, etc. The accommodation space 11 is covered by the shell 10, which means that the shell 10 can have multiple walls that collectively enclose the accommodation space 11, and the first wall 12 can be any one of the multiple walls. The end cover 15 can be the first wall 12, or at least one wall of the shell body 14 can be the first wall 12.

[0044] The electrode assembly 20 can include a positive electrode sheet, a negative electrode sheet, and a separator film, and can be a laminated electrode assembly 20 in which the positive electrode sheet, the negative electrode sheet, and the separator film are stacked, or a wound electrode assembly 20 in which the positive electrode sheet, the negative electrode sheet, and the separator film are wound.

[0045] The liquid injection base 31 can have a plate-like structure, and the liquid injection base 31 and the first wall 12 can be integrally formed or separately provided and connected. The outer surface 312 of the liquid injection base can be exposed to the outside of the shell 10, the inner surface 311 of the liquid injection base can be located in the accommodation space 11, and the outer surface 312 of the liquid injection base and the inner surface 311 of the liquid injection base can be flat. The liquid injection base 31 can protrude from the outer surface of the first wall 12, or the outer surface 312 of the liquid injection base can be flush with the outer surface of the first wall 12. The liquid injection base 31 can protrude from the inner surface of the first wall 12, or the inner surface 311 of the liquid injection base can be flush with the inner surface of the first wall 12.

[0046] The liquid injection base and the cover plate 33 can be a metal material such as copper, aluminum, steel, etc., or an insulating material such as plastic rubber, etc., and the material of the liquid injection module 30 and the material of the cover plate 33 can be the same or different. The liquid injection module 30 and the cover plate 33 can be a square plate or a circular plate.

[0047] The sealing pin 32 can be plastic or rubber.

[0048] The liquid injection hole 313 is in communication with the accommodation space 11 and is used to inject liquid into the accommodation space 11 through the liquid injection hole 313.

[0049] The cover plate 33 is detachably mounted on the liquid injection base 31. The cover plate 33 and the liquid injection base 31 can be detachable by various connection methods, such as clamping, connecting through a locking member 34, etc. The cover plate 33 can prevent the sealing spike 32 from being detached from the liquid injection hole 313 in a direction from the inner surface 311 to the outer surface 312. In the thickness direction of the first wall 1212, the sealing spike 32 can abut against the inner surface of the cover plate 33 or be arranged with a gap with the inner surface of the cover plate 33. The gap between the sealing spike 32 and the inner surface of the cover plate 33 is smaller than the depth of the sealing spike 32 inserted into the liquid injection hole 313.

[0050] When the battery monomer 100 is first injected with liquid, the electrolyte required by the battery monomer 100 can be injected into the containing space 11 through the liquid injection hole 313. Then, the liquid injection hole 313 is sealed by the sealing spike 32, and the cover plate 33 is mounted to prevent the sealing spike 32 from being detached from the liquid injection hole 313 in a direction from the inner surface 311 of the liquid injection base to the outer surface 312 of the liquid injection base. Thus, the operation of first injecting the battery monomer 100 with liquid can be completed. When the battery monomer 100 is injected with liquid again to supplement the liquid, the cover plate 33 is first detached from the liquid injection base 31, the sealing spike 32 is removed to open the liquid injection hole 313, and the operation of first injecting the battery monomer 100 with liquid is repeated. Thus, the operation of supplementing the liquid of the battery monomer 100 can be completed.

[0051] In the present scheme, the sealing spike 32 is inserted into the liquid injection hole 313, and the cover plate 33 is detachably mounted on the liquid injection base 31. The sealing spike 32 seals the liquid injection hole 313, and the cover plate 33 prevents the sealing spike 32 from being detached from the liquid injection hole 313. Thus, the risk of leakage of the electrolyte in the battery monomer 100 from the liquid injection hole 313 is reduced. When the electrolyte in the battery monomer 100 is insufficient, the cover plate 33 can be detached, and the sealing spike 32 can be pulled out of the liquid injection hole 313. The battery monomer 100 can be continuously injected with liquid through the liquid injection hole 313, thereby prolonging the service life of the battery monomer 100.

[0052] Please refer to Figure 5 and Figure 6 , Figure 5 the exploded view of the battery monomer provided in some embodiments of the present application, Figure 6 is Figure 5 the enlarged view of W1 in FIG. 1. In some embodiments, the shell 10 further includes a second wall 13 adjacent to the first wall 12, and the liquid injection base 31 is adjacent to the second wall 13. The battery monomer 100 further includes an electrode terminal 40 arranged on the second wall 13 and electrically connected to the electrode assembly 20.

[0053] The second wall 13 and the first wall 12 can be two opposite walls of the shell 10 or two adjacent walls of the shell 10. As an example, in Figure 5In the shown embodiment, the shell 10 is cuboid, the second wall 13 is arranged adjacent to the first wall 12, and the shell 10 has two second walls 13, both of which are end caps 15, and the shell 10 has the first wall 12, and the electrode terminal 40 is arranged on each second wall 13, the electrode terminal 40 on one second wall 13 is a positive electrode terminal 40, and the electrode terminal 40 on the other second wall 13 is a negative electrode terminal 40, and the outer surface of the first wall 12 is a large surface of the shell 10, i.e., the first wall 12 is the wall with the largest outer surface area in the shell 10.

[0054] The electrode terminal 40 is usually made of brass or copper alloy with excellent electrical conductivity and high mechanical strength, and the surface is subjected to silver plating or tin plating treatment to enhance electrical conductivity and prevent oxidation. The common form is a bolt or stud type.

[0055] In the present solution, the electrode terminal 40 is arranged on the second wall 13, and the liquid injection base 31 is arranged on the first wall 12, wherein the first wall 12 is arranged adjacent to or opposite to the second wall 13, so that the electrode terminal 40 and the liquid injection base 31 are arranged on different walls of the shell 10, which is beneficial to reduce the risk of electrolyte flowing to the electrode terminal during the liquid injection process of the battery monomer 100.

[0056] Please refer to Figure 5 , Figure 6 and Figure 7 , Figure 7 are cross-sectional views of the liquid injection module provided in some embodiments of the present application. In some embodiments, the liquid injection base 31 is provided with a groove 314 recessed from the outer surface 312 of the liquid injection base towards the inner surface 311 of the liquid injection base, and the liquid injection hole 313 communicates the groove 314 and the accommodation space 11.

[0057] The cover plate 33 can be completely accommodated in the groove 314 or partially accommodated in the groove 314.

[0058] The liquid injection base 31 is formed with a groove 314 for storing electrolyte overflowing from the inside of the battery during the liquid injection process, and the groove 314 is communicated with the accommodation space 11 of the battery monomer 100 through the liquid injection hole 313. Those skilled in the art can adjust the volume of the groove 314 according to the volume of the accommodation space 11 to meet the requirements of different injection amounts of electrolyte.

[0059] When the liquid storage is performed, the electrolyte is first injected into the accommodating space 11 of the battery monomer 100 through the liquid injection hole 313, and when the amount of the electrolyte in the accommodating space 11 is greater than the electrolyte storage capacity of the battery monomer 100, the electrolyte overflows into the liquid storage space. After the liquid injection is completed, the overflowed electrolyte in the groove 314 can be uniformly cleaned, so as to avoid the overflowed electrolyte from overflowing out of the shell 10 or the electrode pole of the battery cell. After the cleaning is completed, the liquid injection hole 313 is blocked by the sealing rivet, and the sealing rivet 32 is prevented from being separated from the liquid injection hole 313 in the direction of the inner surface 311 of the liquid injection base pointing to the outer surface 312 of the liquid injection base.

[0060] In the scheme, by setting the groove 314 and the liquid injection hole 313 communicating the groove 314 and the accommodating space 11, when the battery monomer 100 overflows during the liquid injection process, the overflowed electrolyte can be stored in the groove 314, which is beneficial to uniformly clean the overflowed electrolyte in the groove 314 after the liquid injection is completed, and is beneficial to reduce the risk of the electrolyte overflowing to the shell 10.

[0061] Please refer to Figure 7 In some embodiments, at least part of the cover plate 33 is accommodated in the groove 314.

[0062] The cover plate 33 has an inner surface and an outer surface, and at least part of the cover plate 33 is accommodated in the groove 314. The cover plate 33 can be completely accommodated in the groove 314, that is, the outer surface of the cover plate 33 is flush with the outer surface 312 of the liquid injection base, and the inner surface of the cover plate 33 is located in the groove 314. The cover plate 33 can be partially accommodated in the groove 314, that is, the outer surface of the cover plate 33 protrudes from the outer surface 312 of the liquid injection base, and the inner surface of the cover plate 33 is located in the groove 314.

[0063] In the scheme, by setting at least part of the cover plate 33 to be accommodated in the groove 314, the cover plate 33 can be matched and installed with the groove 314, which is beneficial to seal the groove 314 by the cover plate 33.

[0064] Please refer to Figure 7 and Figure 8 , Figure 8 A cross-sectional view of a liquid injection module provided for another embodiment of the present application. In some embodiments, the groove wall surface of the groove 314 is provided with a first limiting portion 3141, and the cover plate 33 is located on the side of the first limiting portion 3141 away from the inner surface 311 of the liquid injection base and abuts against the first limiting portion 3141.

[0065] The first limiting portion 3141 can be an annular platform provided on the liquid injection base 31 around the edge of the groove 314, or can be two independent platforms provided on opposite sides of the groove 314.

[0066] The first limiting part 3141 can be provided with a threaded hole, and the locking member 34 can be screwed into the threaded hole through the mounting hole to detachably lock and mount the cover plate 33 to the liquid injection base 31.

[0067] The first limiting part 3141 and the side of the cover plate 33 facing the inner surface 311 of the liquid injection base can be attached to each other to improve the sealing effect between the cover plate 33 and the liquid injection base 31.

[0068] In this solution, by arranging the cover plate 33 against the first limiting part 3141, the first limiting part 3141 limits the depth of the cover plate 33 accommodated in the groove 314, which is beneficial to the sealing of the groove 314 by the cover plate 33.

[0069] Please refer to Figure 8 In some embodiments, the liquid injection module 30 further comprises a locking member 34, and the cover plate 33 is provided with a mounting hole 331, and the locking member 34 passes through the mounting hole 331 and is fixed to the first limiting part 3141.

[0070] The locking member 34 can be a screw, a bolt, etc.

[0071] After the liquid injection is completed and the overflow liquid is cleaned, the sealing pin 32 is blocked to the liquid injection hole 313, the cover plate 33 is attached to the first limiting part 3141 to prevent the sealing pin 32 from being separated from the liquid injection hole 313 in the direction of the inner surface 311 of the liquid injection base pointing to the outer surface 312 of the liquid injection base, and then the cover plate 33 and the liquid injection base 31 are locked and mounted through the locking member 34 and the mounting hole 331. When liquid needs to be supplemented, the locking between the locking member 34 and the mounting hole 331 is released, and the sealing pin 32 is taken out to start the liquid supplement.

[0072] In this solution, by arranging the locking member 34 to pass through the mounting hole 331 and be fixed to the first limiting part 3141, the cover plate 33 is detachably mounted to the liquid injection base 31, which is beneficial to the continuous liquid supplement of the battery monomer 100.

[0073] Please refer to Figure 9 , Figure 9 The cross-sectional view of the liquid injection module provided in some embodiments of the present application (without the third sealing part) is shown in FIG. 8. In some embodiments, the groove wall surface of the groove 314 comprises a groove bottom surface 3142, the liquid injection base 31 comprises a protruding part 315 protruding from the groove bottom surface 3142, the protruding part 315 is located on the side of the cover plate 33 facing the inner surface 311 of the liquid injection base, and the liquid injection hole 313 penetrates the inner surface 311 of the liquid injection base and the end of the protruding part 315 away from the groove bottom surface 3142. The sealing pin 32 comprises a first sealing part 321 and a second sealing part 322 connected to each other, the first sealing part 321 is inserted into the liquid injection hole 313, and at least part of the second sealing part 322 is located between the protruding part 315 and the cover plate 33, and the protruding part 315 and the cover plate 33 cooperate to clamp the second sealing part 322.

[0074] The connection between the first sealing part 321 and the second sealing part 322 can be integrally formed or bonded.

[0075] The first sealing part 321 is inserted into the liquid injection hole 313 by interference fit to achieve sealing.

[0076] In the present solution, the liquid injection hole 313 penetrates the inner surface 311 of the liquid injection base and the end of the protruding part 315 away from the groove bottom surface 3142, the first sealing part 321 is inserted into the liquid injection hole 313, so that the sealing nail 32 achieves basic sealing of the liquid injection hole 313, which is conducive to the sealing nail 32 sealing the liquid injection hole 313. By setting at least part of the second sealing part 322 between the protruding part 315 and the cover plate 33, the protruding part 315 and the cover plate 33 clamp the second sealing part 322, so that the protruding part 315 and the cover plate 33 compress the second sealing part 322, the second sealing part 322 makes it difficult for the first sealing part 321 to separate from the liquid injection hole 313, which is conducive to the sealing nail 32 further improving the sealing performance of the liquid injection hole 313 on the basis of basic sealing.

[0077] Please refer to Figure 9 In some embodiments, the compression amount H of the second sealing part 322 along the thickness direction of the first wall 12 is 0.5mm≤H≤2mm.

[0078] The compression amount H can be any value or a value between any two values of 0.5mm, 1mm, 1.5mm, and 2mm.

[0079] The protruding part 315 and the cover plate 33 clamp the second sealing part 322 to form a compression amount H of the second sealing part 322 along the thickness direction of the first wall 12.

[0080] The thickness of the second sealing part 322 in the clamped state is the first thickness, and the thickness of the second sealing part 322 when it is relaxed from the clamped state and rebounds to the maximum is the second thickness. The compression amount H of the second sealing part 322 can be obtained from the difference between the first thickness and the second thickness.

[0081] The first thickness and the second thickness can be measured by industrial CT (Computed Tomography) technology.

[0082] In the present solution, by setting the compression amount H of the second sealing part 322 to be not less than 0.5mm, the sealing nail 32 satisfies the basic sealing performance of the liquid injection hole 313, which is conducive to reducing the risk of electrolyte flowing out of the liquid injection hole 313. By setting the compression amount H of the second sealing part 322 to be not more than 2mm, the risk of excessive pressure on the sealing cover plate 33 is reduced, which is conducive to improving the service durability of the sealing cover plate 33.

[0083] Please refer to Figure 10 and Figure 11 , Figure 10 A sectional view of the liquid injection module provided by some embodiments of the present application (with a third sealing part), Figure 11 is Figure 10 A local enlarged view of W2 in FIG. 12. In some embodiments, the sealing spike 32 comprises a third sealing part 323, which protrudes from the surface of the second sealing part 322 facing the protruding part 315 along the thickness direction of the first wall 12. The third sealing part 323 is annular in structure, and is arranged around the protruding part 315 and abuts the outer circumferential surface of the protruding part 315.

[0084] The connection between the third sealing part 323 and the second sealing part 322 can be integrally formed or bonded.

[0085] After the liquid injection is completed and the overflow is cleaned, the first sealing part 321 is first inserted into the liquid injection hole 313, and the third sealing part 323 is arranged around and abuts the outer circumferential surface of the protruding part 315. Then, the cover plate 33 and the protruding part 315 jointly compress the second sealing part 322, and the compression amount H is calculated by comparing the first thickness and the second thickness, so as to prevent the sealing spike 32 from being separated from the liquid injection hole 313 in the direction of the inner surface 311 of the liquid injection base pointing to the outer surface 312 of the liquid injection base. Finally, the locking member 34 and the mounting hole 331 are used to lock and mount the cover plate 33 and the liquid injection base 31.

[0086] In the present solution, the third sealing part 323 is arranged around the protruding part 315 and abuts the outer circumferential surface of the protruding part 315, so that the first sealing part 321, the second sealing part 322 and the third sealing part 323 jointly form an inverted “mountain” shape, thereby making the liquid injection hole 313, the sealing spike 32 and the cover plate 33 tightly fit, which is beneficial to the sealing spike 32 to form a good sealing effect on the liquid injection hole 313, and the cover plate 33 to form a good fixing effect on the sealing spike 32.

[0087] Please refer to Figure 10 and Figure 11 In some embodiments, the size of the third sealing part 323 along the thickness direction of the first wall 12 is H1, and H1≥1mm.

[0088] The size of the third sealing part 323 can be measured by industrial CT (Computed Tomography) technology.

[0089] The compression amount H1 can be any value or a value between any two values in the range of 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm.

[0090] In the scheme, the size of the third sealing part 323 is not less than 1 mm, so that the electrolyte is difficult to flow out along the hole wall of the liquid injection hole 313, and the sealing nail 32 can form a good sealing effect on the liquid injection hole 313.

[0091] Please refer to Figure 9 、 Figure 10 and Figure 11 In some embodiments, along the thickness direction of the first wall 12, the surface of the cover plate 33 facing the protruding part 315 is provided with a second limiting part 332, and the second limiting part 332 is annular structure, and the second limiting part 332 surrounds the second sealing part 322.

[0092] The second limiting part 332 surrounds the second sealing part 322, and there is a certain amount of gap between the second sealing part 322 and the second limiting part 332, so as to allow the second sealing part 322 to expand and contract.

[0093] In the scheme, by setting the second limiting part 332 to surround the second sealing part 322, the relative position of the second sealing part 322 to the cover plate 33 after compression is limited, which helps to reduce the deviation of the second sealing part 322 after compression, improve the fixing effect of the cover plate 33 on the sealing nail 32, and improve the sealing effect of the sealing nail 32 on the liquid injection hole 313.

[0094] Please refer to Figure 9 、 Figure 10 and Figure 11 In some embodiments, along the thickness direction of the first wall 12, the size of the second limiting part 332 is H2, and H2≥1mm.

[0095] The compression amount H2 can be any value or a value between any two values in 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm.

[0096] In the scheme, the size of the second limiting part 332 is not less than 1 mm, so that the second sealing part 322 can not deviate after compression, which helps to improve the fixing and sealing effect.

[0097] Please refer to Figures 3 to 11 In some embodiments, the material of the sealing nail 32 includes elastic rubber.

[0098] The material of the sealing nail 32 includes elastic rubber, and the material of the elastic rubber can be fluororubber, silicone rubber, chloroprene rubber, etc.

[0099] In the scheme, by setting the material of the sealing nail 32 including elastic rubber, the second sealing part 322 of the sealing nail 32 can be compressed, the first sealing part 321 is attached to the hole wall of the liquid injection hole 313, and the third sealing part 323 is attached to the outer peripheral surface of the protruding part 315, which is beneficial to the sealing nail 32 to form a good sealing effect on the liquid injection hole 313.

[0100] Please refer to Figures 3 to 11 In some embodiments, the first wall 12 is integrally formed with the liquid injection base 31, or the first wall 12 is separately provided with the liquid injection base 31, and the first wall 12 is provided with a through hole 121, and the liquid injection base 31 is inserted into the through hole 121 and is sealingly connected with the first wall 12.

[0101] The first wall 12 and the liquid injection base 31 can be integrally formed by die casting or casting.

[0102] In the scheme, by setting the first wall 12 and the liquid injection base 31 to be integrally formed, or by setting the through hole 121 on the first wall 12 and sealingly connecting with the liquid injection base 31, the outer surface 312 of the liquid injection base is sealed with the shell 10, which is beneficial to improve the sealing performance of the battery monomer 100.

[0103] Please refer to Figure 2 In some embodiments, some embodiments of the application provide a battery pack 1000, which comprises the battery monomer 100.

[0104] In the scheme, by setting the battery pack 1000 to set the battery monomer 100, the plurality of battery monomers 100 can be connected according to the power demand, which is beneficial to improve the applicability of the battery monomer 100.

[0105] Please refer to Figure 1 In some embodiments, some embodiments of the application provide a power consuming device 10000, which comprises the battery monomer 100 or the battery pack 1000.

[0106] In the scheme, by setting the battery pack 1000 in the power consuming device 10000, the battery pack 1000 and the power consuming device 10000 form a closed loop, which is beneficial to the transformation and circulation of energy.

[0107] In the present application, a plurality of refers to two or more than two.

[0108] In this application, unless otherwise clearly specified, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0109] The terms "first", "second", "third", "fourth" and the like (if any) in this application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0110] The term "and / or" in this application is only a description of the relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the front and rear associated objects.

[0111] If there is no special description, all the steps of this application can be performed in sequence, or randomly. For example, the method comprises steps A and B, which means that the method can comprise steps A and B in sequence, or steps B and A in sequence. For example, the method also comprises step C, which means that step C can be added to the method in any order, for example, the method can comprise steps A, B and C, or steps A, C and B, or steps C, A and B, etc.

[0112] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell (100) characterized in that The application relates to a battery cell, which comprises: a housing (10) comprising a first wall (12); a containing space (11) arranged inside the battery cell (100), the containing space (11) being covered by the housing (10); an electrode assembly (20) arranged in the containing space (11); a liquid injection module (30) comprising: a liquid injection base (31) arranged on the first wall (12) and having opposite inner and outer surfaces (311, 312) along the thickness direction of the first wall (12), the liquid injection base (31) being provided with a liquid injection hole (313) extending to the inner surface (311) and communicating with the containing space (11); a sealing pin (32) inserted into the liquid injection hole (313); a cover plate (33) detachably mounted on the liquid injection base (31) and located on the side of the sealing pin (32) away from the containing space (11) along the thickness direction of the first wall (12).

2. The battery cell (100) according to claim 1, characterized in that The liquid injection base (31) is provided with a groove (314) recessed from the outer surface (312) towards the inner surface (311), and the liquid injection hole (313) communicates the groove (314) with the containing space (11).

3. The battery cell (100) according to claim 2, characterized in that At least part of the cover plate (33) is arranged in the groove (314).

4. The battery cell (100) according to claim 3, characterized in that The groove wall surface of the groove (314) is provided with a first limiting portion (3141), and the cover plate (33) is located on the side of the first limiting portion (3141) away from the inner surface (311) and abuts against the first limiting portion (3141).

5. The battery cell (100) according to claim 4, characterized in that The liquid injection module (30) further comprises a locking member (34), the cover plate (33) is provided with a mounting hole (331), and the locking member (34) passes through the mounting hole (331) and is locked to the first limiting portion (3141).

6. The battery cell (100) according to any one of claims 2-5, characterized in that, The groove wall surface of the groove (314) comprises a groove bottom surface (3142), the liquid injection base (31) comprises a protruding portion (315) protruding from the groove bottom surface (3142), the protruding portion (315) is located on the side of the cover plate (33) facing the inner surface (311), and the liquid injection hole (313) penetrates the inner surface (311) and one end of the protruding portion (315) away from the groove bottom surface (3142). The sealing pin (32) comprises a first sealing portion (321) and a second sealing portion (322) connected with each other, the first sealing portion (321) is inserted into the liquid injection hole (313), at least part of the second sealing portion (322) is located between the protruding portion (315) and the cover plate (33) along the thickness direction of the first wall (12), and the protruding portion (315) and the cover plate (33) cooperate to clamp the second sealing portion (322).

7. The battery cell (100) according to claim 6, characterized in that The compression amount of the second sealing portion (322) is H, and 0.5mm<=H<=2mm along the thickness direction of the first wall (12).

8. The battery cell (100) according to claim 6, characterized in that The sealing spike (32) comprises a third sealing portion (323) protruding from a surface of the second sealing portion (322) facing the protruding portion (315) in the thickness direction of the first wall (12), the third sealing portion (323) has a ring structure, and the third sealing portion (323) is arranged around the protruding portion (315) and abuts against an outer circumferential surface of the protruding portion (315).

9. The battery cell (100) according to claim 8, characterized in that In the thickness direction of the first wall (12), the third sealing portion (323) has a size H1, and H1≥1mm.

10. The battery cell (100) of claim 6, wherein, In the thickness direction of the first wall (12), a surface of the cover plate (33) facing the protruding portion (315) is provided with a second limiting portion (332), the second limiting portion (332) has a ring structure, and the second limiting portion (332) is arranged around the second sealing portion (322).

11. The battery cell (100) according to claim 10, characterized in that In the thickness direction of the first wall (12), the second limiting portion (332) has a size H2, and H2≥1mm.

12. The battery cell (100) according to any one of claims 1-11, characterized in that The shell (10) comprises a second wall (13) arranged adjacent to the first wall (12), and the liquid injection base (31) is adjacent to the second wall (13). The battery monomer (100) comprises an electrode terminal (40) arranged on the second wall (13) and electrically connected with the electrode assembly (20).

13. The battery cell (100) according to any one of claims 1-11, characterized in that, The first wall (12) is integrally formed with the liquid injection base (31); or The first wall (12) is arranged with a through hole (121), and the liquid injection base (31) is inserted into the through hole (121) and sealingly connected with the first wall (12).

14. A battery pack (1000) characterized by, The battery monomer (100) comprises the battery monomer (100) according to any one of claims 1-13.

15. An electrical device (10000) characterized by The battery pack (1000) comprises the battery monomer (100) according to any one of claims 1-13 or the battery pack (1000) according to claim 14.

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