CN220138667U

CN220138667U - Pole assembly, cover plate assembly, battery cell and battery module

Info

Publication number: CN220138667U
Application number: CN202321553799.8U
Authority: CN
Inventors: 慎晓杰; 邓国友; 施财辉; 李晓和; 李超
Original assignee: Microvast Power Systems Huzhou Co Ltd
Current assignee: Microvast Power Systems Huzhou Co Ltd
Priority date: 2023-06-16
Filing date: 2023-06-16
Publication date: 2023-12-05
Anticipated expiration: 2033-06-16

Abstract

The utility model discloses a pole assembly, which comprises a pole, a first sealing piece and a second sealing piece, wherein a liquid injection hole penetrating through the pole is formed in the pole; the first sealing element and the second sealing element are sequentially arranged along the extending direction of the liquid injection hole, the second sealing element is detachably connected with the pole, and the first sealing element is made of elastic materials; when the liquid is replenished, the first sealing element can be pierced and penetrated by the liquid injection needle, and the pierced part on the first sealing element can be airtight after the liquid injection needle is pulled out. The utility model solves the problem of high resealing difficulty after secondary fluid infusion into the battery core, simplifies the fluid infusion process, reduces secondary pollution to electrolyte and improves fluid infusion efficiency and battery tightness. The utility model also provides a cover plate assembly, a battery cell and a battery module.

Description

Pole assembly, cover plate assembly, battery cell and battery module

Technical Field

The utility model relates to the technical field of power batteries, in particular to a pole assembly, a cover plate assembly, an electric core and a battery module.

Background

Lithium secondary batteries have been widely used in the fields of consumer electronics, power electric vehicles, energy storage, and the like. In the use process of the battery, part of electrolyte is consumed, so that the service life of the battery is reduced. In the prior art, in order to prolong the service life of the battery, a mode of secondary electrolyte replenishing is generally adopted. However, in the prior art, the sealing of the liquid filling port is usually realized by adopting a laser welding sealing nail, if the welded sealing nail is required to be destroyed for secondary liquid filling, then electrolyte is injected into the battery cell, but after liquid filling is finished, the difficulty of resealing the liquid filling port is high. Therefore, the liquid supplementing process is complex, the efficiency is low, and secondary pollution of the battery is easy to cause.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the utility model aims to provide a pole assembly, a cover plate assembly, an electric core and a battery module, solve the problem of high resealing difficulty after secondary fluid infusion into the electric core, simplify the fluid infusion process, reduce secondary pollution to electrolyte and improve fluid infusion efficiency and battery tightness.

The aim of the utility model is achieved by the following technical scheme:

the pole column assembly comprises a pole column, a first sealing piece and a second sealing piece, wherein a liquid injection hole penetrating through the pole column is formed in the pole column, the first sealing piece and the second sealing piece are at least partially arranged in the liquid injection hole, and the first sealing piece and the second sealing piece seal the liquid injection hole; the first sealing piece and the second sealing piece are sequentially arranged along the extending direction of the liquid injection hole, the second sealing piece is detachably connected with the pole, and the first sealing piece is made of elastic materials; when the liquid is replenished, the first sealing element can be pierced and penetrated by the liquid injection needle, and the pierced part on the first sealing element can be airtight after the liquid injection needle is pulled out.

In one embodiment, the pole has a thickness direction, and the liquid injection hole penetrates through the pole along the thickness direction; the first sealing piece and the second sealing piece are sequentially arranged along the thickness direction, and the first sealing piece and the second sealing piece respectively seal different positions of the liquid injection hole along the thickness direction.

In an embodiment, the liquid injection hole comprises a first through hole part and a second through hole part which are communicated with each other, and the first through hole part and the second through hole part are sequentially arranged along the thickness direction; the first seal and the second seal the second through hole portion and the first through hole portion.

In an embodiment, the first sealing member has a T-shaped structure, the aperture of the second through hole portion is smaller than that of the first through hole portion, and a pole step is formed at the junction of the second through hole portion and the first through hole portion; the pole step limits part of the first sealing piece, so that one part of the first sealing piece is arranged in the second through hole part, and the other part of the first sealing piece is arranged in the first through hole part.

In an embodiment, the first sealing member includes a stop portion and a plug portion that are connected to each other, and the plug portion is disposed in the second through hole portion by limiting the pole step, and the stop portion is located in the first through hole portion.

In an embodiment, a positioning hole of the liquid injection needle is arranged at one end, close to the second sealing piece, of the first sealing piece, and the positioning hole of the liquid injection needle does not penetrate through the abutting portion.

In an embodiment, the abutment portion and the plugging portion are respectively in a cylindrical structure, and the diameter of the second through hole portion is smaller than that of the abutment portion.

In an embodiment, the plug portion is away from the end of the abutment portion from the end away from the second seal member toward the end close to the second seal member, so that an outer surface of the bottom portion of the plug portion in contact with the second through hole portion forms a tapered slope.

In an embodiment, the outer wall of the first sealing element and the inner wall of the liquid injection hole are fixed by glue; and/or the outer wall of the first sealing piece is fixedly connected with the inner wall of the liquid injection hole through interference fit.

In one embodiment, the second sealing member is connected with the inner wall of the liquid injection hole through threads.

In an embodiment, the entire second sealing member is disposed within the liquid injection hole; or the second sealing piece comprises a first screw rod part and a second screw rod part which are connected with each other, external threads are arranged on the outer walls of the first screw rod part and the second screw rod part, the first screw rod part is positioned in the liquid injection hole, and the outer wall of the first screw rod part is connected with the inner wall of the liquid injection hole through threads; the second screw rod part at least partially extends out of the liquid injection hole.

In one embodiment, the inner surface of the second sealing member is provided with a threaded hole along the axial direction thereof, and the threaded hole does not penetrate through the second sealing member.

The utility model also provides a cover plate assembly, which comprises a cover plate and the pole assembly arranged on the cover plate, wherein the cover plate is provided with a pole hole, and the pole is arranged in the pole hole.

The utility model also provides a battery cell, which comprises the cover plate assembly and the battery shell, wherein at least one end of the battery shell is provided with an opening, and the cover plate is arranged at the opening; in the post assembly, the first seal is positioned in the pouring hole closer to the inside of the battery case than the second seal.

In an embodiment, the openings are formed at two opposite ends of the battery case, the number of the cover plates is two, the two cover plates are respectively arranged at the openings at the two opposite ends of the battery case, and at least one of the cover plates is provided with the pole assembly.

The utility model also provides a battery module which comprises a plurality of electric cores, wherein the pole column assemblies on the electric cores are electrically connected through the electric connecting piece.

The utility model has the beneficial effects that: the first sealing element and the second sealing element are arranged in the liquid injection hole to seal the liquid injection hole, when liquid injection is needed, the second sealing element is taken down, the needle head of the liquid injection needle pierces the first sealing element, the first sealing element can wrap the liquid injection needle, and the internal and external isolation of the battery during liquid supplementing is ensured; when the fluid infusion is finished, the self-reinforcing performance of the first sealing element ensures that the puncture hole is closed and airtight, and the inside and outside of the battery are isolated, so that the isolation of the inside and outside environments of the battery is ensured when the on-site battery cell is used for fluid infusion, the external water vapor and dust are prevented from entering the inside of the battery, the performance of the battery is influenced, and the safety of the battery is also ensured; and the whole operation process is simple, and the liquid supplementing efficiency is high.

Drawings

FIG. 1 is a schematic diagram of an explosion structure of a battery cell according to an embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view of a cell according to an embodiment of the present utility model;

FIG. 3 is an enlarged partial schematic view at A of FIG. 2;

fig. 4 is a schematic structural diagram of a battery cell during fluid infusion in an embodiment of the present utility model;

FIG. 5a is a schematic view of a first seal according to an embodiment of the present utility model;

FIG. 5b is a front view of FIG. 5 a;

FIG. 6a is a schematic diagram of a second seal in an embodiment of the utility model;

fig. 6b is a schematic structural view of a battery module according to an embodiment of the present utility model;

FIG. 7a is a schematic view of a second seal member according to another embodiment of the present utility model;

FIG. 7b is a front view of FIG. 7 a;

FIG. 7c is a cross-sectional view of FIG. 7 a;

fig. 7d is a schematic view illustrating a structure of a battery module according to another embodiment of the present utility model;

FIG. 8a is a schematic view of a second seal member according to yet another embodiment of the present utility model;

fig. 8b is a schematic view illustrating a structure of a battery module according to another embodiment of the present utility model.

In the figure: 10-pole assembly, 1-pole, 11-liquid injection hole, 111-first through hole part, 112-second through hole part, 113-pole step, 2-first sealing element, 21-liquid injection needle positioning hole, 22-stop part, 23-plug part, 231-taper inclined plane, 3-second sealing element, 31-first screw part, 32-second screw part, 33-threaded hole, 4-cover plate assembly, 41-cover plate, 5-battery shell, 6-electric core, 7-electric connecting element, 8-liquid injection needle, 91-bolt and 92-nut.

Detailed Description

Specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms described above will be understood to those of ordinary skill in the art in a specific context.

The terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," and the like are used as references to orientations or positional relationships based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the inventive product is conventionally disposed in use, merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore are not to be construed as limiting the utility model.

The terms "first," "second," "third," and the like, are merely used for distinguishing between similar elements and not necessarily for indicating or implying a relative importance or order.

The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a list of elements does not include only those elements but may include other elements not expressly listed.

The present utility model provides a pole assembly 10, as shown in fig. 1 to 4, the pole assembly 10 is mounted on a cover plate 41 of a battery cell 6, and electrolyte can be injected into the battery cell 6 through the pole assembly 10, so that secondary electrolyte replenishing of the electrolyte is realized. The pole assembly 10 comprises a pole 1, a first seal 2 and a second seal 3. The pole 1 is provided with a liquid injection hole 11 penetrating through the pole 1, when the pole assembly 10 is installed on the battery core 6, the liquid injection hole 11 is communicated with the inside of the battery core 6, and electrolyte can be injected into the battery core 6 through the liquid injection hole 11. The first sealing piece 2 and the second sealing piece 3 are at least partially arranged in the liquid injection hole 11, and the first sealing piece 2 and the second sealing piece 3 seal the liquid injection hole 11, so that electrolyte can be prevented from overflowing out of the battery cell 6. The first sealing element 2 and the second sealing element 3 are sequentially arranged along the extending direction of the liquid injection hole 11, the second sealing element 3 is detachably connected with the pole 1, and the first sealing element 2 is made of elastic materials. When the liquid injection is needed, the second sealing piece 3 is detached, and the liquid is injected into the battery cell 6 through the first sealing piece 2 by puncturing and penetrating the liquid injection needle 8; when the liquid injection is completed, after the liquid injection needle 8 is pulled out, the punctured part of the first sealing element 2 can be automatically closed and is free from air leakage, the second sealing element 3 is installed in the liquid injection hole 11 to reseal the liquid injection hole 11, the second sealing element 3 can be repeatedly utilized, resources are saved, and the environment protection performance is high. The first sealing element 2 is made of a polymer material with high elasticity and low hardness, and can be made of rubber, silica gel or other polymer materials, the hardness of the first sealing element 2 is low, so that the electrolyte is injected into the battery cell 6 after the electrolyte injection needle 8 is easy to pierce the first sealing element 2, the high elasticity of the first sealing element 2 is convenient for pulling out the electrolyte injection needle 8, the state of the battery cell can be quickly recovered, the battery cell is airtight after the puncture hole is closed, the inside and outside of the battery cell is isolated, and the battery performance is improved.

Specifically, in this embodiment, the first sealing member 2 and the second sealing member 3 are disposed in the liquid injection hole 11 to seal the liquid injection hole 11, when liquid injection is required, the second sealing member 3 is removed, the needle head of the liquid injection needle 8 pierces the first sealing member 2, the first sealing member 2 can wrap the liquid injection needle 8, and the internal and external isolation of the battery during liquid filling is ensured; when the fluid infusion is finished, the self-reinforcing performance of the first sealing element 2 ensures that the puncture hole is closed after the fluid infusion needle 8 is pulled out, the first sealing element 2 is airtight after the needle head of the fluid infusion needle 8 is pulled out, and the inside and the outside of the battery are isolated, so that the isolation of the inside and the outside of the battery when the field battery cell 6 is used for fluid infusion is ensured, external water vapor and dust are prevented from entering the inside of the battery, the performance of the battery is influenced, and the safety of the battery is ensured; and the whole operation process is simple, and the liquid supplementing efficiency is high.

As one embodiment, as shown in fig. 3 and 4, the pole 1 has a thickness direction D, and the liquid injection hole 11 penetrates the pole 1 in the thickness direction D. The first sealing piece 2 and the second sealing piece 3 are sequentially arranged along the thickness direction D, and the first sealing piece 2 and the second sealing piece 3 respectively seal different positions of the liquid injection hole 11 along the thickness direction D, so that the liquid injection hole 11 realizes double sealing through the first sealing piece 2 and the second sealing piece 3, and the sealing effect is better.

As an embodiment, as shown in fig. 3 and 4, the pouring orifice 11 includes a first through-hole portion 111 and a second through-hole portion 112 that communicate with each other, the first through-hole portion 111 and the second through-hole portion 112 being arranged in this order in the thickness direction D; the first seal 2 and the second seal 3 are respectively arranged corresponding to the second through hole part 112 and the first through hole part 111, and the first seal 2 and the second seal 3 seal the second through hole part 112 and the first through hole part 111, namely, the first seal 2 correspondingly seals the second through hole part 112, and the second seal 3 correspondingly seals the first through hole part 111.

As an embodiment, as shown in fig. 3, 4, 5a and 5b, the first sealing member 2 has a T-shaped structure, the aperture of the second through hole portion 112 is smaller than the aperture of the first through hole portion 111, and a pole step 113 is formed at the junction of the second through hole portion 112 and the first through hole portion 111; the pole step 113 limits a part of the first seal 2, so that a part of the first seal 2 is disposed in the second through hole 112 and another part is disposed in the first through hole 111.

As an embodiment, as shown in fig. 3, 4, 5a and 5b, the first seal 2 includes a stopper portion 22 and a plug portion 23 connected to each other, and the plug portion 23 is disposed in the second through hole portion 112 by being limited by the pole step 113, and the stopper portion 22 is located in the first through hole portion 111. Specifically, the size of the stopping portion 22 is larger than the size of the inserting portion 23, so that the inserting portion 23 can be inserted into the second through hole portion 112, and the stopping portion 22 is sandwiched between the pole step 113 and the second seal 3. When the second seal 3 is screwed down, the abutment 22 is pressed by the second seal 3 against the pole step 113, achieving a seal.

As an embodiment, as shown in fig. 4 and 5a, the end of the first seal member 2 near the second seal member 3 is provided with a filling needle positioning hole 21, and the filling needle positioning hole 21 does not penetrate the stopper 22. When the injection needle positioning hole 21 on the first sealing element 2 is used for supplementing liquid, the injection needle 8 is positioned, the position where the injection needle 8 is inserted is prevented from being close to the edge of the first sealing element 2, the side surface of the first sealing element 2 is pierced in the process of piercing the first sealing element 2, the inner wall of the injection hole 11 is pierced, and the first sealing element 2 cannot be pierced along the axial direction, so that normal liquid injection is affected.

As an embodiment, as shown in fig. 5a, the abutment portion 22 and the insertion portion 23 have a cylindrical structure, respectively, and the diameter of the second through hole portion 112 is smaller than that of the abutment portion 22, so that the abutment portion 22 cannot be inserted into the second through hole portion 112, and is limited in the first through hole portion 111 by the pole step 113.

As an embodiment, as shown in fig. 3 and 5b, from one end far from the second sealing member 3 toward one end close to the second sealing member 3, the diameter of the insertion portion 23 is gradually reduced from one end far from the abutting portion 22, so that the outer surface of the bottom of the insertion portion 23, which is in contact with the second through hole portion 112, forms a tapered slope 231, and when the first sealing member 2 is mounted, the insertion portion 23 can be quickly aligned with the second through hole portion 112 and mounted therein, thereby improving the mounting efficiency.

As an embodiment, the outer wall of the first sealing member 2 and the inner wall of the liquid injection hole 11 are fixed by adhesive bonding; and/or the outer wall of the first sealing element 2 is fixedly connected with the inner wall of the liquid injection hole 11 through interference fit.

As an implementation mode, the second sealing piece 3 is connected with the inner wall of the liquid injection hole 11 through threads, the structure is simple, the second sealing piece 3 is convenient to assemble and disassemble, and the liquid injection efficiency is improved. Specifically, the inner wall of the liquid injection hole 11 is provided with an internal thread, the outer wall of the second sealing piece 3 is provided with an external thread matched with the internal thread, and the outer wall of the second sealing piece 3 is connected with the inner wall of the liquid injection hole 11 through threads. The shape of the pole is not limited, and the cross section of the pole 1 is circular, square, elliptical or kidney-shaped.

As an embodiment, as shown in fig. 6b and 7d, the entire second seal 3 is disposed in the liquid injection hole 11; alternatively, as shown in fig. 8a and 8b, the second sealing member 3 includes a first screw portion 31 and a second screw portion 32 that are connected to each other, external threads are provided on outer walls of the first screw portion 31 and the second screw portion 31, the first screw portion 31 is located in the liquid injection hole 11, and the outer wall of the first screw portion 31 is connected to an inner wall of the liquid injection hole 11 by threads; the second screw rod portion 32 extends out of the liquid injection hole 11 at least partially, so that the electric connector 7 can be connected with each electric core 6 through the extending second screw rod portion 32 and the nut 92, and serial-parallel connection of each electric core 6 is realized.

As an embodiment, as shown in fig. 7a and 7c, a threaded hole 33 is formed in the inner surface of the second seal member 3 along the axial direction thereof, and the threaded hole 33 does not penetrate the second seal member 3. As shown in fig. 7d, by providing the threaded hole 33, the electric connector 7 is convenient to connect each electric core 6 through the threaded hole 33 and the bolt 91, so as to realize the serial-parallel connection of each electric core 6.

Specifically, the second sealing member 3 is a bolt provided with external threads, including an external thread bolt, an internal and external thread bolt, or an external thread two-stage bolt.As shown in fig. 6a, the second seal 3 is an externally threaded bolt; as shown in fig. 7a to 7c, the second seal member 3 is an internally and externally threaded bolt provided with an external thread and a threaded hole 33 provided with an internal thread; as shown in fig. 8a, the second seal 3 is an externally threaded two-stage bolt, and the second shank portion 32 protrudes at least partially outside the pole 1. Wherein the external screw bolt and the internal screw bolt can be integrally arranged in the liquid injection hole 11 _； Of course, the male screw bolt and the female screw bolt may partially protrude from the liquid injection hole 11.

As an embodiment, the second seal 3 is made of an electrically conductive material, and the second seal 3 is electrically connected to the pole 1. The second seal 3 may be made of a metallic material such as copper or aluminum.

The present utility model also provides a cover plate assembly, as shown in fig. 1 and 2, comprising a cover plate 41 and the pole assembly 10 as described above disposed on the cover plate 41, wherein a pole hole (not shown) is disposed on the cover plate 41, and the pole 1 is disposed in the pole hole.

As one embodiment, the number of cover plates 41 is two, each for being disposed at opposite ends of the battery case, and the post assembly 10 is disposed on at least one of the cover plates 41.

The utility model also provides a battery cell, as shown in fig. 1 and 2, comprising the cover plate assembly 4 and the battery shell 5, wherein at least one end of the battery shell 5 is provided with an opening (not shown), and the cover plate 41 is arranged at the opening; in the post assembly 10, the first seal 2 is positioned in the pouring hole 11 closer to the inside of the battery case 5 than the second seal 3.

As an embodiment, the opposite ends of the battery case 5 are provided with openings, the number of the cover plates 41 is two, the two cover plates 41 are respectively arranged at the openings of the opposite ends of the battery case 5, and at least one of the cover plates 41 is provided with the pole assembly 10. Further, a plurality of pole assemblies 10, such as two or three, can be correspondingly arranged on each cover plate 41, and are uniformly distributed on the cover plates 41, so that the electrolyte can be injected into the battery cell 6 through the plurality of pole assemblies 10 at the same time, and the electrolyte injection efficiency is improved; and can satisfy the requirement that electrolyte evenly soaks electric core 6, improve the effect that electrolyte soaks electric core 6.

The utility model also provides a battery module, as shown in fig. 6b, comprising a plurality of the electric cores 6, wherein the pole assemblies 10 on the electric cores 6 are electrically connected through the electric connecting pieces 7. Specifically, the plurality of electric cores 6 are regularly arranged, and the cover plate 41 at the same end of each electric core 6 is provided with the pole assembly 10, so that the electric connector 7 can be conveniently connected with each pole assembly 10, and the electric connector 7 realizes serial-parallel connection of the plurality of electric cores 6 by connecting each pole assembly 10. The electrical connector 7 may be made of copper, aluminum, nickel, or other metal materials. Further, a plurality of cells 6 may be arranged side by side.

As an embodiment, as shown in fig. 6a and 6b, the inner wall of the injection hole 11 is provided with an internal thread, and the second seal 3 is an external thread bolt, that is, the second seal 3 is provided with an external thread. The external threads of the external threaded bolts are matched and connected with the internal threads of the liquid injection holes 11, and the electric connecting piece 7 is connected with the top of the pole assembly 10 through welding to realize the serial-parallel connection of a plurality of electric cores 6.

As an embodiment, as shown in fig. 7a to 7d, the inner wall of the liquid injection hole 11 is provided with an internal thread, the second sealing member 3 is an internal and external thread bolt, that is, the second sealing member 3 is provided with an external thread, meanwhile, the inner surface of the second sealing member 3 is provided with a threaded hole 33 along the axial direction, and the external thread of the internal and external thread bolt is in fit connection with the internal thread of the liquid injection hole 11. The bolt 91 comprises a rod part provided with external threads and a stop part, the rod part of the bolt 91 penetrates through the electric connecting piece 7 to be in threaded connection with the inner wall of the threaded hole 33, and the stop part of the bolt 91 presses the electric connecting piece 7 to realize serial-parallel connection of the plurality of electric cores 6.

As an embodiment, as shown in fig. 8a and 8b, the inner wall of the liquid injection hole 11 is provided with an internal thread, the second sealing member 3 is an external thread two-stage bolt, the external thread two-stage bolt comprises a first screw rod portion 31 and a second screw rod portion 32 which are connected with each other, the external thread of the first screw rod portion 31 is connected with the internal thread of the liquid injection hole 11, the second screw rod portion 32 at least partially protrudes outside the pole 1 and penetrates through the electric connecting member 7, and the electric connecting member 7 is connected in series and parallel with the external thread portion of the second screw rod portion 32 protruding outside the pole 1 through a nut 92.

The beneficial effects of the utility model are as follows: the first sealing element 2 and the second sealing element 3 are arranged in the liquid injection hole 11 to seal the liquid injection hole 11, when liquid injection is needed, the second sealing element 3 is taken down, the needle head of the liquid injection needle 8 pierces the first sealing element 2, the first sealing element 2 can wrap the liquid injection needle 8, and the internal and external isolation of the battery during liquid filling is ensured; when the fluid infusion is finished, the self-reinforcing performance of the first sealing element 2 ensures that the puncture hole is closed and the inside and the outside of the battery are isolated after the fluid infusion needle 8 is pulled out, so that the isolation of the inside and the outside of the battery is ensured when the on-site battery cell 6 is used for fluid infusion, external water vapor and dust are prevented from entering the inside of the battery, the performance of the battery is prevented from being influenced, and the safety of the battery is also ensured; the whole operation process is simple, and the liquid supplementing efficiency is high; furthermore, the pole 1 is integrated with the liquid injection hole 11, and the electric connecting piece 7 on the pole 1 is removed firstly during liquid supplementing, so that the liquid supplementing electric core 6 is in a disconnected state, and the liquid supplementing is safer.

The present utility model is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present utility model.

Claims

1. The pole assembly is characterized by comprising a pole (1), a first sealing piece (2) and a second sealing piece (3), wherein a liquid injection hole (11) penetrating through the pole (1) is formed in the pole (1), the first sealing piece (2) and the second sealing piece (3) are at least partially arranged in the liquid injection hole (11), and the first sealing piece (2) and the second sealing piece (3) seal the liquid injection hole (11); the first sealing piece (2) and the second sealing piece (3) are sequentially arranged along the extending direction of the liquid injection hole (11), the second sealing piece (3) is detachably connected with the pole column (1), and the first sealing piece (2) is made of an elastic material; when the liquid is replenished, the first sealing element (2) can be pierced and penetrated by the liquid injection needle (8), and the pierced part on the first sealing element (2) can be airtight after the liquid injection needle (8) is pulled out.

2. A pole assembly according to claim 1, wherein the pole (1) has a thickness direction (D), the injection hole (11) penetrating the pole (1) in the thickness direction (D); the first sealing piece (2) and the second sealing piece (3) are sequentially arranged along the thickness direction (D), and the first sealing piece (2) and the second sealing piece (3) respectively seal different positions of the liquid injection hole (11) along the thickness direction (D).

3. The pole assembly according to claim 2, wherein the liquid injection hole (11) includes a first through hole portion (111) and a second through hole portion (112) that are communicated with each other, the first through hole portion (111) and the second through hole portion (112) being arranged in order along the thickness direction (D); the first seal (2) and the second seal (3) seal the second through hole portion (112) and the first through hole portion (111).

4. A pole assembly according to claim 3, wherein the first seal (2) is of T-shaped configuration, the second through hole portion (112) having a smaller aperture than the first through hole portion (111), the junction of the second through hole portion (112) and the first through hole portion (111) forming a pole step (113); the pole step (113) limits a part of the first sealing member (2), so that one part of the first sealing member (2) is arranged in the second through hole part (112), and the other part of the first sealing member is arranged in the first through hole part (111).

5. The pole assembly according to claim 4, wherein the first seal (2) comprises a stop portion (22) and a plug portion (23) connected to each other, the plug portion (23) being arranged in the second through hole portion (112) by limiting the pole step (113), the stop portion (22) being located in the first through hole portion (111).

6. Pole assembly according to claim 5, wherein the end of the first seal (2) adjacent to the second seal (3) is provided with a needle positioning hole (21), the needle positioning hole (21) not penetrating the abutment (22).

7. The pole assembly of claim 5, wherein the abutment portion (22) and the spigot portion (23) are each of cylindrical configuration, and the diameter of the second through hole portion (112) is smaller than the diameter of the abutment portion (22).

8. The pole assembly of claim 5, wherein the end of the spigot portion (23) remote from the abutment portion (22) tapers in diameter from the end remote from the second seal (3) towards the end proximate to the second seal (3) such that the outer surface of the bottom of the spigot portion (23) in contact with the second through hole portion (112) forms a tapered slope (231).

9. A pole assembly according to claim 1, wherein the outer wall of the first seal (2) and the inner wall of the injection hole (11) are fixed by adhesive bonding; and/or the outer wall of the first sealing piece (2) is fixedly connected with the inner wall of the liquid injection hole (11) through interference fit.

10. Pole assembly according to claim 1, wherein the second seal (3) is screwed to the inner wall of the injection hole (11).

11. A terminal assembly according to claim 10, wherein the entire second seal (3) is arranged within the injection hole (11);

or, the second sealing element (3) comprises a first screw rod part (31) and a second screw rod part (32) which are connected with each other, external threads are arranged on the outer walls of the first screw rod part (31) and the second screw rod part (32), the first screw rod part (31) is positioned in the liquid injection hole (11), and the outer wall of the first screw rod part (31) is connected with the inner wall of the liquid injection hole (11) through threads; the second screw part (32) at least partially extends out of the liquid injection hole (11).

12. A terminal assembly according to claim 1, wherein the second seal (3) has a threaded bore (33) formed in its inner surface along its axial direction, the threaded bore (33) not extending through the second seal (3).

13. A cover plate assembly, characterized by comprising a cover plate (41) and a pole assembly (10) according to any one of claims 1-12 arranged on the cover plate (41), wherein a pole hole is arranged on the cover plate (41), and the pole (1) is arranged in the pole hole.

14. A battery cell, characterized by comprising a cover plate assembly (4) as claimed in claim 13 and a battery housing (5), wherein at least one end of the battery housing (5) is provided with an opening, and the cover plate (41) is arranged at the opening; in the pole assembly (10), the first seal (2) is positioned in the liquid injection hole (11) closer to the inside of the battery case (5) than the second seal (3).

15. The cell according to claim 14, wherein the openings are formed in opposite ends of the battery case (5), the number of the cover plates (41) is two, the two cover plates (41) are respectively disposed at the openings of the opposite ends of the battery case (5), and at least one of the cover plates (41) is provided with the terminal assembly (10).

16. A battery module characterized by comprising a plurality of electric cells (6) according to claim 14 or 15, wherein the pole assemblies (10) on the electric cells (6) are electrically connected through an electrical connector (7).