Pole, terminal assembly and battery

Abstract

The present application provides a pole, a terminal assembly and a battery, the pole comprising: a base having a first surface; the column body is arranged on the first surface and provided with a second surface deviating from the base, and a heat conduction groove is formed in the second surface and filled with a heat conduction material. The heat conduction groove is formed in the second surface, deviating from the base, of the post body of the post, and the heat conduction groove is filled with the heat conduction material, so that heat dissipation of the post can be accelerated, heat accumulation of the post is avoided, and the risk of thermal runaway of the battery is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery heat dissipation, in particular to a pole, a terminal assembly and a battery. BACKGROUND

[0002] In the related art, in order to save costs, the structural design of the battery pole results in a decrease in the flow area of the pole, which in turn leads to an increase in the flow temperature rise of the pole, and thus leads to an increase in the center temperature of the pole, and further leads to a serious heat accumulation in the battery. At this time, if the heat is not dissipated in time, the battery may be triggered to heat runaway. CONTENT OF THE INVENTION

[0003] Embodiments of the application provide a pole, a terminal assembly and a battery, which can improve the technical problem of battery heat runaway caused by an increase in the flow temperature rise of the pole in the related art.

[0004] In a first aspect, embodiments of the application provide a pole, comprising:

[0005] a base having a first surface;

[0006] a pole body arranged on the first surface, the pole body having a second surface facing away from the base, the second surface being provided with a heat conduction groove, and the heat conduction groove being filled with a heat conduction material.

[0007] The application provides the heat conduction groove on the second surface of the pole body facing away from the base, and fills the heat conduction groove with the heat conduction material, which helps to accelerate the heat dissipation of the pole, avoids the problem of heat accumulation caused by an increase in the flow temperature rise of the pole, and thus reduces the risk of battery heat runaway caused by heat accumulation of the pole.

[0008] In an embodiment, the pole body comprises a first pole body part and a second pole body part connected to each other along an axial direction of the pole body, and an end portion of the second pole body part away from the first pole body part is connected to the base; along the axial direction of the pole body, a height of the first pole body part is H1, and a depth of the heat conduction groove is H2, and 0.09mm≤H2≤0.9H1 is satisfied.

[0009] The application makes the pole body comprise the first pole body part and the second pole body part connected to each other along the axial direction of the pole body, so that when the pole is connected to the terminal pressing block, the first pole body part and the second pole body part can be respectively fitted into the through hole on the terminal pressing block from both sides of the terminal pressing block and welded together, which helps to conveniently realize the connection between the pole and the terminal pressing block; and by satisfying 0.09mm≤H2≤0.9H1 between the height H1 of the first pole body part and the depth H2 of the heat conduction groove, the flow performance of the pole can be ensured while the material of the pole is saved (cost is saved).

[0010] In an embodiment, the first columnar part is integrally formed with the second columnar part; or, the second columnar part is integrally formed with the base.

[0011] The application defines the columnar part as an integral structure, which is then welded with the base, so as to facilitate the connection between the pole and the terminal pressing block. When the second columnar part is integrally formed with the base, the second columnar part extends from the first surface of the base. The integral formation of the second columnar part with the base increases the heat conduction area of the battery and improves the overcurrent capacity of the battery, thereby improving the safety of the battery. Meanwhile, the integral formation of the second columnar part with the base also saves the processing cost.

[0012] In an embodiment, the columnar part is integrally formed with the base.

[0013] The integral formation of the columnar part with the base can reduce the processing procedures, save the processing cost, and avoid the reduction of the heat conduction area due to the gap between the negative pole and the pole tab, thereby helping to improve the problem of heat accumulation in the battery.

[0014] In an embodiment, the heat-conductive material includes a phase-change material, the phase-change material is filled in the heat-conductive groove, and the pole further includes a sealing member, the sealing member seals the slot of the heat-conductive groove.

[0015] The application sets the heat-conductive material as a phase-change material, which helps to exchange heat by phase change of the material. By using the sealing member to seal the slot of the heat-conductive groove, the problem of escape of the phase-change material due to the change into the gaseous state can be avoided.

[0016] In an embodiment, the sealing member completely covers the second surface.

[0017] The application makes the sealing member completely cover the second surface of the columnar part, which is more conducive to the heat dissipation of the columnar part and improves the heat accumulation in the battery.

[0018] In an embodiment, the sealing member includes an aluminum sheet, a plastic sheet, and / or a sealing glue, and / or the thickness of the sealing member is 0.05mm-0.5mm.

[0019] The application can use an aluminum sheet, a plastic sheet, and / or a sealing glue as the sealing member, so that the setting of the sealing member is relatively easy to realize. By setting the thickness of the sealing member to be 0.05mm-0.5mm, the use of materials can be saved on the basis of ensuring the sealing effect.

[0020] In an embodiment, the heat-conductive groove is coaxially arranged with the columnar part.

[0021] The application co-axially arranges the heat-conductive groove with the columnar part, which helps to ensure the structural strength of the pole and avoid the problems such as the easy collapse of the groove wall of the heat-conductive groove and the difficulty in welding the edge of the pole with the terminal pressing block due to the eccentric arrangement.

[0022] In an embodiment, the slot of the heat-conducting groove is chamfered.

[0023] The application chamfers the slot of the heat-conducting groove, increases the size of the slot of the heat-conducting groove, and helps to fill the heat-conducting material into the heat-conducting groove.

[0024] In an embodiment, the cross section of the heat-conducting groove in the direction perpendicular to the central axis of the heat-conducting groove is circular or elliptical.

[0025] The application sets the cross section of the heat-conducting groove in the direction perpendicular to the central axis of the heat-conducting groove as circular or elliptical, helps to reduce the flow resistance of the heat-conducting material when filling the heat-conducting material, and makes the heat-conducting material fill the heat-conducting groove as much as possible, thereby helping to ensure the heat dissipation effect.

[0026] In an embodiment, the included angle between the wall of the heat-conducting groove and the central axis of the heat-conducting groove is θ, and 0°≤θ≤60° is satisfied.

[0027] In an embodiment, the radial dimension of the heat-conducting groove gradually decreases along the depth direction of the heat-conducting groove.

[0028] The application makes the radial dimension of the heat-conducting groove gradually decrease along the depth direction of the heat-conducting groove, helps to reduce the difficulty of filling the heat-conducting material to the bottom of the heat-conducting groove, and makes the heat-conducting material fill the heat-conducting groove as much as possible, thereby ensuring the heat dissipation effect.

[0029] In an embodiment, the heat-conducting material includes potting glue or heat-conducting gel.

[0030] In a second aspect, an embodiment of the application provides a terminal assembly, including: the pole as described above; and a terminal pressing block, which is provided with a through hole, and the end portion of the pole body away from the base is arranged in the through hole and connected with the terminal pressing block.

[0031] In an embodiment, the terminal pressing block has a third surface away from the base, the third surface is provided with a sunken platform around the through hole, the top surface of the sunken platform is flush with the second surface, and the sealing element of the pole is arranged on the second surface and the top surface of the sunken platform; and the third surface is flush with the surface of the sealing element away from the pole body.

[0032] The application makes the top surface of the sunken platform flush with the second surface, which helps to facilitate the arrangement of the sealing element; and makes the third surface flush with the surface of the sealing element away from the pole body, which helps to ensure the flatness of the terminal assembly on the third surface side.

[0033] In a third aspect, an embodiment of the application provides a battery, including the terminal assembly as described above. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0035] Figure 1 is a structural schematic diagram of a pole provided by some embodiments of the present application;

[0036] Figure 2 is a structural schematic diagram of a pole provided by some embodiments of the present application;

[0037] Figure 3 is a structural schematic diagram of another pole provided by some embodiments of the present application;

[0038] Figure 4 is a structural schematic diagram of another pole provided by some embodiments of the present application;

[0039] Figure 5 is a structural schematic diagram of another pole provided by some embodiments of the present application;

[0040] Figure 6 is a structural schematic diagram of a pole provided by some embodiments of the present application;

[0041] Figure 7 is a structural schematic diagram of a heat-conducting groove provided by some embodiments of the present application;

[0042] Figure 8 is a sectional view of a pole provided by some embodiments of the present application;

[0043] Figure 9 is a sectional view of another pole provided by some embodiments of the present application;

[0044] Figure 10 is a sectional view of another pole provided by some embodiments of the present application;

[0045] Figure 11 is a schematic diagram of a heat-conducting material filling area provided by some embodiments of the present application;

[0046] Figure 12 is a structural schematic diagram of a terminal assembly provided by some embodiments of the present application.

[0047] Reference signs:

[0048] 1-base, 2-column, 3-heat conduction groove, 4-heat conduction material, 5-seal, 6-terminal block, 11-first surface, 21-first column part, 22-second column part, 23-second surface, 61-third surface, 62-sink. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0050] With the progress of fast charging technology, the heat accumulation in the battery is also more and more serious. If the heat is not dissipated in time, it may cause thermal runaway of the battery. In the related art, for the negative electrode top cover, the pole column is divided into an upper pole column, a lower pole column and a base. The lower pole column and the base are made of the same material and are connected together by welding. The upper pole column is connected to the lower pole column. In order to ensure the welding strength, a sink design is made on the upper pole column. As a result, on the one hand, the processing cost is high, and on the other hand, there is a gap between the negative electrode pole column and the tab, the heat conduction area is reduced, which is not conducive to solving the problem of heat accumulation in the battery. In addition, in order to save materials and save costs, the depth and width dimensions of the sink of the upper pole column are designed to be large, so that a large pit is formed on the upper pole column, which reduces the flow area of the pole column and increases the flow temperature rise. Since the heat transfer coefficient of air is very low, the temperature at the center of the pole column is increased. This is also not conducive to solving the problem of heat accumulation in the battery.

[0051] Please refer to Figure 1 , Figure 1 is a structural diagram of a pole column provided by an embodiment of the present application. The embodiment of the present application provides a pole column, which comprises a base 1 having a first surface 11; a column 2 arranged on the first surface 11, the column 2 having a second surface 23 facing away from the base 1, and the second surface 23 being provided with a heat conduction groove 3, and the heat conduction groove 3 being filled with a heat conduction material 4.

[0052] The heat-conducting groove 3 opened on the second surface 23 of the pole body 2 in the embodiment of the present application is filled with a heat-conducting material 4, which increases the heat-conducting area of the pole and helps to accelerate the heat dissipation of the pole, avoiding the problem of heat accumulation of the pole due to the increase of the temperature rise of the pole, thereby reducing the risk of thermal runaway of the battery caused by heat accumulation of the pole.

[0053] Please refer to Figure 2 , Figure 2 is a structural schematic diagram of a pole provided by some embodiments of the present application (the unit in the figure is mm). In some embodiments of the present application, the pole 2 comprises a first pole body part 21 and a second pole body part 22 connected to each other along the axial direction of the pole, and the end of the second pole body part 22 away from the first pole body part 21 is connected to the base 1; along the axial direction of the pole 2, the height of the first pole body part 21 is H1, and the depth of the heat-conducting groove 3 is H2, which satisfies 0.09mm≤H2≤0.9H1.

[0054] In the embodiment, by making the pole 2 comprise the first pole body part 21 and the second pole body part 22 connected to each other along the axial direction of the pole, when the pole is connected to the terminal pressing block 6, the first pole body part 21 and the second pole body part 22 can be respectively inserted into the through hole on the terminal pressing block 6 from both sides of the terminal pressing block 6 and welded together, which helps to more conveniently realize the connection between the pole and the terminal pressing block 6; the heat-conducting groove 3 is opened on the first pole body part 21, therefore, the depth H2 of the heat-conducting groove 3 is closely related to the height H1 of the first pole body part 21, when designing the heat-conducting groove 3, not only the influence of the depth H2 of the heat-conducting groove 3 on the heat dissipation effect needs to be considered, but also the influence of the depth H2 of the heat-conducting groove 3 on the first pole body part 21 needs to be considered. In the embodiment, the depth H2 of the heat-conducting groove 3 and the height H1 of the first pole body part 21 need to satisfy 0.09mm≤H2≤0.9H1, when the depth H2 of the heat-conducting groove 3 is within this range, not only the overcurrent performance of the pole can be guaranteed, but also the structural strength of the first pole body part 21 can be guaranteed.

[0055] Please refer to Figure 3 and Figure 4 , Figure 3 is another structural schematic diagram of a pole provided by an embodiment of the present application (the unit in the figure is mm), Figure 4 is another structural schematic diagram of a pole provided by some embodiments of the present application (the unit in the figure is mm). In some embodiments of the present application, the first pole body part 21 and the second pole body part 22 are integrally formed; or, the second pole body part 22 and the base 1 are integrally formed.

[0056] In some embodiments of the present application, the column body 2 is a one-piece structure, and the column body 2 is welded to the base 1. At this time, the column body 2 can be inserted into the through hole on the terminal pressing block 6 from the side of the terminal pressing block 6 away from the base 1, and then welded to the base 1, which helps to more conveniently realize the connection between the pole column and the terminal pressing block 6. When the second column part 22 is integrally formed with the base 1, the second column part 22 is extended from the first surface 11 of the base 1, and is integrally formed with the base 1, which increases the heat conduction area of the battery and improves the overcurrent capacity of the battery, thereby improving the safety of the battery. At the same time, the integrally formed second column part 22 and the base 1 also save processing costs.

[0057] Please refer to Figure 5 , Figure 5 is another schematic structural diagram of a pole column provided by an embodiment of the present application. In some embodiments of the present application, the column body 2 is integrally formed with the base 1.

[0058] In the embodiment of the present application, the column body 2 is integrally formed with the base 1. At this time, the pole column and the terminal pressing block 6 can be connected in a riveting manner. Compared with the pole column arranged in a split manner in the related art, the processing procedure can be reduced, the processing cost can be saved, and the problem of reduced heat conduction area caused by the gap between the negative pole column and the pole lug can be avoided, thereby helping to improve the problem of heat accumulation in the battery.

[0059] Please refer to Figure 6 , Figure 6 is a schematic structural diagram of a column body provided by some embodiments of the present application. In some embodiments of the present application, the heat-conducting material 4 includes a phase change material, the phase change material is filled in the heat-conducting groove 3, and the pole column further includes a sealing member 5 sealing the slot of the heat-conducting groove 3.

[0060] In the present embodiment, the heat-conducting material 4 is a phase change material. In order to prevent the new product after the change of the physical state of the phase change material from affecting the performance of the battery, a sealing member 5 (for reference Figure 6 ) sealing the heat-conducting groove 3 is arranged at the slot of the heat-conducting groove 3 in the present embodiment, so that the phase change material is in a sealed space. The present embodiment not only increases the heat conduction area of the pole column, is conducive to heat dissipation of the pole column, avoids the safety risk caused by heat accumulation of the pole column, but also avoids the problem of escape of the phase change material due to the change to the gaseous state.

[0061] In some embodiments of the present application, the sealing member 5 completely covers the second surface 23.

[0062] Please refer to Figure 6 , the sealing member 5 in the present embodiment completely covers the second surface 23 of the column body 2, which is more conducive to heat dissipation of the column body 2 and also improves the heat accumulation in the battery.

[0063] In some embodiments of the present application, the sealing member 5 comprises an aluminum sheet, a plastic sheet, or a potting adhesive, and the thickness of the sealing member 5 is 0.05mm-0.5mm.

[0064] The sealing member 5 in the present embodiment is used to seal the heat-conducting groove 3, and by setting the thickness of the sealing member 5 to be between 0.05mm and 0.5mm, it is helpful to save materials while ensuring the sealing effect. Obviously, the thickness and material of the sealing member 5 in the above embodiments are examples and do not constitute a limitation on the present application.

[0065] In some embodiments of the present application, the heat-conducting groove 3 is coaxially arranged with the column body 2.

[0066] In the present embodiment, the heat-conducting groove 3 is coaxially arranged with the column body 2, so that the heat-conducting groove 3 is located at the middle position of the column body 2, avoiding the situation that the heat dissipation effects of different parts of the column body 2 are different, fully utilizing the heat-conducting material 4 to dissipate heat for the pole column, and avoiding the safety risk caused by heat accumulation of the pole column. At the same time, it is also helpful to ensure the structural strength of the pole column, avoiding problems such as easy collapse of the groove wall of the heat-conducting groove 3 and difficult welding of the edge of the pole column and the terminal pressing block 6 due to eccentric arrangement.

[0067] Please refer to Figure 7 , Figure 7 is a structural schematic view of a heat-conducting groove provided in some embodiments of the present application, and in some embodiments of the present application, the notch of the heat-conducting groove 3 is chamfered.

[0068] In the present embodiment, the notch of the heat-conducting groove 3 is chamfered, and the size of the notch of the heat-conducting groove 3 is increased, which is helpful to fill the heat-conducting material 4 into the heat-conducting groove 3.

[0069] Please refer to Figure 8 and Figure 9 , Figure 8 is a sectional view of a column body provided in some embodiments of the present application, Figure 9 is another sectional view of a column body provided in some embodiments of the present application. In some embodiments of the present application, the cross section of the heat-conducting groove 3 is circular or elliptical in the direction perpendicular to the central axis of the heat-conducting groove 3.

[0070] The main purpose of opening the heat-conducting groove 3 on the column body 2 of the pole column is to enhance the heat dissipation effect of the pole column and avoid the safety risk caused by heat accumulation of the pole column. Therefore, in the present embodiment, the cross-sectional shape of the heat-conducting groove 3 is designed to be circular or elliptical, which can accommodate more heat-conducting material 4 compared to other cross-sectional shapes, and at the same time, it also reduces the flow resistance of the heat-conducting material 4. Therefore, the heat dissipation effect of the pole column is better, effectively avoiding the safety risk caused by heat accumulation of the pole column, and solving the technical problem that the heat accumulation in the battery is serious, which may cause the battery to be out of control.

[0071] In some embodiments of the present application, the angle between the groove wall of the heat-conducting groove 3 and the central axis of the heat-conducting groove 3 is θ, and 0°≤θ≤60° is satisfied.

[0072] In the present embodiment, the angle between the groove wall of the heat-conducting groove 3 and the central axis of the heat-conducting groove 3 is selected within the range of 0°-60° (including 0° and 60°), so that the heat-conducting material 4 can completely fill the heat-conducting groove 3 without any dead space (i.e. space that cannot be filled by the heat-conducting material 4), thereby ensuring the heat dissipation effect of the pole and the strength of the pole body 2.

[0073] Please refer to Figure 10 , Figure 10 is another cross-sectional view of a pole body provided in some embodiments of the present application. In some embodiments of the present application, the radial dimension of the heat-conducting groove 3 gradually decreases along the depth direction of the heat-conducting groove 3.

[0074] The present application increases the heat dissipation area of the pole by filling the heat-conducting material 4 in the heat-conducting groove 3. Therefore, when designing the heat-conducting groove 3, the convenience of filling the heat-conducting material 4 and whether the heat-conducting material 4 can completely fill the heat-conducting groove 3 should be considered. In the present embodiment, the radial dimension of the heat-conducting groove 3 gradually decreases along the depth direction of the heat-conducting groove 3, which helps to reduce the difficulty of filling the heat-conducting material 4 to the bottom of the heat-conducting groove 3, facilitates the filling of the heat-conducting material 4, and ensures that the heat-conducting material 4 can completely fill the heat-conducting groove 3 without any dead space (i.e. space that cannot be filled by the heat-conducting material 4). The complete filling of the heat-conducting material 4 in the heat-conducting groove 3 increases the heat dissipation area of the pole, avoids the safety risk caused by heat accumulation of the pole, and solves the technical problem that heat accumulation in the battery may cause thermal runaway of the battery.

[0075] In some embodiments of the present application, the heat-conducting material 4 includes potting glue or heat-conducting gel.

[0076] In the present embodiment, the heat-conducting glue can be cured potting glue or heat-conducting gel. Since the physical state of the heat-conducting glue is stable and less likely to change, when the heat-conducting material 4 is heat-conducting glue, the heat-conducting glue can be directly filled in the heat-conducting groove 3 without the need to seal the heat-conducting groove 3. Alternatively, the heat-conducting glue can be filled in the heat-conducting groove 3 and the space where the sealing member 5 is arranged. Please refer to Figure 11 . Obviously, the specific types of heat-conducting glue in the above embodiments are examples and do not constitute a limitation on the present application.

[0077] On the other hand, the present embodiment also provides a terminal assembly, which includes: the above-mentioned pole; and a terminal pressing block 6 provided with a through hole, wherein the end portion of the pole body 2 away from the base 1 is arranged in the through hole and connected with the terminal pressing block 6.

[0078] In some embodiments of the present application, the terminal block 6 has a third surface 61 facing away from the base 1, the third surface 61 is provided with a sunken platform 62 around the through hole, the platform of the sunken platform 62 is flush with the second surface 23, the seal 5 of the pole is arranged on the second surface 23 and the platform of the sunken platform 62; the third surface 61 is flush with the surface of the seal 5 away from the column body 2.

[0079] Please refer to Figure 12 , Figure 12 is a structural schematic diagram of a terminal assembly provided by an embodiment of the present application, in the embodiment of the present application, by making the platform of the sunken platform 62 flush with the second surface 23, it is helpful to facilitate the arrangement of the seal 5; and by making the third surface 61 flush with the surface of the seal 5 away from the column body 2, it is helpful to ensure the flatness of the terminal assembly on the third surface 61 side.

[0080] On the other hand, the embodiment of the present application also provides a battery comprising the above terminal assembly.

[0081] The embodiments of the present application are described in detail above, and the specific examples are applied in this paper to describe the principles and implementation modes of the present application; the above embodiment descriptions are only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as the limitation of the present application.

Claims

1. A pole, characterized in that: include: a base having a first surface; The column is arranged on the first surface, and the column has a second surface away from the base. The second surface is provided with a heat conduction groove, and the heat conduction groove is filled with a heat conducting material.

2. The pole according to claim 1, characterized in that The column includes a first column portion and a second column portion connected to each other along its axial direction, the second surface is the end face of the first column portion away from the second column portion, and the end of the second column portion away from the first column portion is connected to the base; along the axial direction of the column, the height of the first column portion is H1, and the depth of the heat conduction groove is H2, satisfying: 0.09mm≤H2≤0.9H1.

3. The pole according to claim 2, characterized in that The first column portion and the second column portion are integrally formed; or the second column portion and the base are integrally formed.

4. The pole according to claim 1, characterized in that The column and the base are integrally formed.

5. The pole according to claim 1, characterized in that The heat-conducting material includes a phase-change material, and the pole further includes a sealing member, which seals the notch of the heat-conducting groove.

6. The pole according to claim 5, characterized in that The seal completely covers the second surface.

7. The pole according to claim 5, characterized in that The sealing member is an aluminum sheet, a plastic sheet or a potting compound, and / or the thickness of the sealing member is 0.05 mm to 0.5 mm.

8. The pole according to claim 1, characterized in that The heat conducting groove is coaxially arranged with the column.

9. The pole according to claim 1, characterized in that The notch of the heat conducting groove is chamfered.

10. The pole according to claim 1, characterized in that In a direction perpendicular to the central axis of the heat-conducting groove, the cross-section of the heat-conducting groove is circular or elliptical.

11. The pole according to claim 10, characterized in that The angle between the groove wall of the heat conducting groove and the central axis of the heat conducting groove is θ, which satisfies: 0°≤θ≤60°.

12. The pole according to claim 11, characterized in that Along the depth direction of the heat conducting groove, the radial dimension of the heat conducting groove gradually decreases.

13. The pole according to claim 1, characterized in that The thermally conductive material includes potting compound or thermally conductive gel.

14. A terminal assembly, characterized in that: include: The pole according to any one of claims 1 to 13; The terminal pressing block is provided with a through hole, and the end of the column away from the base is passed through the through hole and connected to the terminal pressing block.

15. The terminal assembly according to claim 14, wherein: The terminal pressing block has a third surface facing away from the base, and a sink is provided on the third surface surrounding the through hole. The surface of the sink is flush with the second surface of the pole, and the seal of the pole is provided on the second surface and the surface of the sink; the third surface is flush with the surface of the seal away from the column.

16. A battery, characterized in that: Comprising the terminal assembly according to claim 14 or 15.

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