Pole assembly and battery

Abstract

The utility model provides a pole assembly and a battery, the pole assembly is applied to the battery, the battery comprises a cover plate and a battery cell, the pole assembly comprises a pole, a thermal insulation part and upper plastic, and the pole is used for communicating the battery cell with an external circuit; the thermal insulation piece is arranged at the end part, facing the cover plate, of the pole; the upper plastic is arranged on the side, away from the pole, of the heat insulation and insulation part, the side, away from the heat insulation and insulation part, of the upper plastic is used for being connected with the cover plate, the heat insulation and insulation part builds a heat resistance layer between the pole and the upper plastic, heat transfer resistance is increased, and the heat insulation and insulation part can utilize the heat resistance characteristic of the heat insulation and insulation part. According to the utility model, heat transferred from the pole is buffered, so that the upper plastic cannot be impacted by a large amount of heat in a short time, certain heat-resistant protection is provided for the upper plastic, and the problem that the upper plastic is fused due to the fact that the upper plastic cannot bear high temperature is solved.

Description

TECHNICAL FIELD

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

[0002] With the rapid development of electric vehicles, energy storage devices and the like, the demand for endurance mileage and charging speed is increasingly urgent, and in order to meet this demand, the energy density and charging rate of the battery cell are continuously improved.

[0003] In the production of lithium batteries, the pole post is usually fixed on the cover plate of the battery cell, and the pole post is used to realize the connection between the battery cell and the external circuit, and plastic is arranged between the pole post and the cover plate of the battery cell to play an important role in isolation and support.

[0004] However, under the condition of high-rate charging, the current input to the battery cell from the battery pack end significantly increases, and the overcurrent demand also increases, resulting in an increase in the power of the bus bar to the pole post during welding. During the welding process, a large amount of heat is transferred to the pole post, which easily causes the upper plastic to melt due to the inability to withstand high temperature, thereby affecting the normal production and assembly of the battery cell and adversely affecting the performance and safety of the battery cell. Inventive content

[0005] The application discloses a pole post assembly and a battery, which solves the problem of melting of the upper plastic due to the inability to withstand high temperature.

[0006] In order to achieve the above-mentioned purpose, the application discloses a pole post assembly ， applied to a battery, the battery comprising a cover plate and a battery cell, the pole post assembly comprising:

[0007] a pole post, the pole post being used to communicate the battery cell and an external circuit;

[0008] a heat insulation piece, the heat insulation piece being arranged at an end of the pole post facing the cover plate;

[0009] upper plastic, the upper plastic being arranged on a side of the heat insulation piece away from the pole post, and the side of the upper plastic away from the heat insulation piece being used to connect with the cover plate.

[0010] Optionally, the heat insulation piece is a ceramic piece.

[0011] Optionally, a first positioning part is arranged on the pole post, a second positioning part is arranged on the heat insulation piece, and the first positioning part and the second positioning part are matched to position the pole post on the heat insulation piece in a first direction, and the first direction is perpendicular to the arrangement direction of the pole post and the heat insulation piece.

[0012] Optionally, the first positioning part is a plug-in protrusion extending towards the thermal insulation part, and the second positioning part is a plug-in slot in plug-in cooperation with the plug-in protrusion along the arrangement direction of the pole and the thermal insulation part.

[0013] Optionally, the thermal insulation part and the upper plastic are integrally formed by an injection molding process.

[0014] Optionally, the thermal insulation part is provided with an injection molding embedding hole, so that the upper plastic forms an embedding part in the injection molding embedding hole when the thermal insulation part and the upper plastic are integrally formed by an injection molding process.

[0015] Optionally, the injection molding embedding hole is in communication with the plug-in slot, and the plug-in protrusion and the embedding part have a gap therebetween.

[0016] Optionally, the thermal insulation part is provided with a plurality of protrusions towards the surface of the upper plastic, so that the plurality of protrusions can be embedded in the upper plastic when the thermal insulation part and the upper plastic are integrally formed by an injection molding process.

[0017] Optionally, the thickness of the thermal insulation part is 0.1-3 mm.

[0018] The application also discloses a battery, which comprises:

[0019] The pole assembly described above;

[0020] The shell;

[0021] The cover plate is arranged at the opening of the shell, and the pole assembly is arranged on the cover plate;

[0022] The battery cell is arranged in the shell.

[0023] Compared with the prior art, the application has the following beneficial effects:

[0024] The thermal insulation part is arranged at the end of the pole towards the cover plate, can block the heat transferred from the busbar to the pole to the cover plate and the upper plastic during the welding process to a certain extent, can reduce the rate and total amount of heat transfer, can reduce the heat transferred to the upper plastic, can avoid the risk of melting of the upper plastic as much as possible, and the thermal insulation part can establish a thermal resistance layer between the pole and the upper plastic, can increase the resistance of heat transfer, and the thermal insulation part can use its own thermal resistance characteristics to buffer the heat transferred from the pole, so that the upper plastic will not be impacted by a large amount of heat in a short time, and the upper plastic can be provided with certain heat resistance protection, so that the problem of melting of the upper plastic due to the inability to withstand high temperature is solved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following embodiments are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0026] Figure 1 is a schematic diagram of a pole assembly provided by an embodiment of the present application;

[0027] Figure 2 is a top view of the upper plastic and the heat insulation piece assembled in one body provided by an embodiment of the present application;

[0028] Figure 3 is a schematic diagram of the pole assembly assembled in one body provided by an embodiment of the present application;

[0029] Figure 4 is a schematic diagram of a pole assembly provided by another embodiment of the present application;

[0030] Figure 5 is a schematic diagram of the pole assembly assembled in one body provided by another embodiment of the present application.

[0031] Main drawing mark explanation

[0032] 1-pole assembly;

[0033] 10-gasket;

[0034] 100-pole; 110-first positioning part;

[0035] 200-heat insulation piece; 210-second positioning part; 220-injection molded embedded hole; 230-protruding part;

[0036] 300-upper plastic; 310-embedded part. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0038] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0039] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned partial terms may also be used to indicate other meanings, for example, the term "upper" may also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0040] In addition, the terms "mount", "set", "provided with", "connected", "connected" should be broadly understood. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In addition, the terms "first", "second" and the like are mainly used to distinguish different devices, elements or components, which may have the same or different specific types and structures, and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0042] As mentioned in the background, under high-rate charging conditions, the current input to the cell from the bus bar increases significantly, and the overcurrent demand also increases, resulting in an increase in the power of the bus bar to the pole during welding. During the welding process, a large amount of heat is transferred to the pole, which is prone to melting of the upper plastic due to its inability to withstand high temperatures, affecting the normal production and assembly of the cell, and also adversely affecting the performance and safety of the cell.

[0043] In order to solve the above problems, the present application provides a pole assembly and a battery, which can block the heat transferred from the bus bar to the pole during welding to the direction of the cover plate and the upper plastic to some extent, reduce the rate and total amount of heat transfer, reduce the heat transferred to the upper plastic, and avoid the risk of melting of the upper plastic as much as possible, thereby solving the problem of melting of the upper plastic due to its inability to withstand high temperatures.

[0044] The technical solutions of the pole assembly and the battery according to the present application will be further described below in combination with specific embodiments and drawings.

[0045] Referring to Figures 1 to 3 The present embodiment provides a pole assembly 1 applied to a battery, the battery comprising a cover plate and a battery cell, the pole assembly 1 comprising: a pole 100, a heat insulation piece 200, and an upper plastic 300, the pole 100 being used to connect the battery cell and an external circuit; the heat insulation piece 200 being arranged at an end of the pole 100 facing the cover plate; and the upper plastic 300 being arranged at a side of the heat insulation piece 200 away from the pole 100, the side of the upper plastic 300 away from the heat insulation piece 200 being used to be connected with the cover plate.

[0046] The heat insulation piece 200 can be a ceramic piece or a mica sheet, etc., the pole 100 can be a riveted aluminum block or other conductive material, and the upper plastic 300 can be polyamide, polycarbonate, polystyrene, polyphenylene sulfide, etc., which are not limited herein.

[0047] The heat insulation piece 200 is arranged at the end of the pole 100 facing the cover plate, which can block the heat transferred from the busbar to the pole 100 in the welding process from being conducted to the cover plate and the upper plastic 300, can reduce the rate and total amount of heat transfer, and can reduce the heat transferred to the upper plastic 300, avoid the melting risk of the upper plastic 300 as much as possible, and establish a thermal resistance layer between the pole 100 and the upper plastic 300, increase the resistance of heat transfer, and use the thermal resistance characteristics of the heat insulation piece 200 to buffer the heat transferred from the pole 100, so that the upper plastic 300 will not be impacted by a large amount of heat in a short time, and the upper plastic 300 is provided with certain heat resistance protection, thereby solving the problem of melting of the upper plastic 300 due to the inability to withstand high temperature.

[0048] For example, referring to Figure 3 When welding between the pole 100 and the busbar 10, the heat insulation piece 200 can block the heat from being conducted to the cover plate and the upper plastic 300 in the welding process to a certain extent.

[0049] In one possible embodiment, the heat insulation piece 200 is a ceramic piece.

[0050] When the thermal insulation and insulation piece 200 is a ceramic piece, the ceramic has very high resistivity and dielectric strength, can effectively prevent current from passing through, isolate the pole 100 from other parts of the battery and the external environment, prevent the occurrence of electric leakage and short circuit phenomena, ensure the electrical safety and stability of the battery system, and ensure that the battery can operate normally under various working conditions. The thermal conductivity of the ceramic is relatively low, which can significantly reduce the heat generated by the pole 100 during charging and discharging to the cover plate and other components, play a good thermal insulation role, help to maintain the uniformity of the internal temperature of the battery, and avoid local overheating. Improve the overall performance and safety of the battery.

[0051] In addition, the ceramic has a high melting point and good thermal stability. During the operation of the battery, even if it faces a high-temperature environment caused by high-rate charging, the ceramic thermal insulation and insulation piece 200 can maintain stable performance and will not deform, melt or have performance degradation due to temperature rise. It can continuously and effectively play the role of thermal insulation and insulation.

[0052] In addition, the ceramic has high hardness and mechanical strength, which can not only support the pole 100 but also compress the upper plastic 300 downward, so that the deformation of the upper plastic 300 can be reduced during the riveting process, ensuring the air-tightness and reliability of the connection between the pole assembly 1 and the cover plate, and further improving the safety of the battery during use.

[0053] In one possible embodiment, referring to Figures 1 to 3 , the pole 100 is provided with a first positioning part 110, and the thermal insulation and insulation piece 200 is provided with a second positioning part 210. The first positioning part 110 cooperates with the second positioning part 210 to position the pole 100 on the thermal insulation and insulation piece 200 in the first direction, and the first direction is perpendicular to the arrangement direction of the pole 100 and the thermal insulation and insulation piece 200.

[0054] The first direction is the direction indicated by the arrow X in Figure 1 .

[0055] Therefore, the pole 100 and the thermal insulation and insulation piece 200 can be accurately positioned in the first direction perpendicular to their arrangement direction, so that the pole 100 and the thermal insulation and insulation piece 200 can be quickly and accurately installed in place during assembly, improving assembly efficiency, ensuring assembly quality, and reducing problems caused by assembly errors, such as misalignment between the pole 100 and the thermal insulation and insulation piece 200, uneven gaps, etc. In addition, through the cooperation of the first positioning part 110 and the second positioning part 210, the relative displacement between the pole 100 and the thermal insulation and insulation piece 200 in the first direction is limited, making the connection between them more stable and improving the structural stability of the pole assembly 1.

[0056] In one possible embodiment, referring to Figure 1 andFigure 3 The first positioning part 110 is a plug-in protrusion extending towards the thermal insulation part 200, and the second positioning part 210 is a plug-in slot matching the plug-in protrusion along the arrangement direction of the pole 100 and the thermal insulation part 200.

[0057] When the first positioning part 110 is a plug-in protrusion extending towards the thermal insulation part 200, and the second positioning part 210 is a plug-in slot matching the plug-in protrusion along the arrangement direction of the pole 100 and the thermal insulation part 200, in the assembly process, the matching of the plug-in protrusion and the plug-in slot can provide clear assembly guidance, and the installer can easily align the plug-in protrusion with the plug-in slot and plug in along the arrangement direction of the pole 100 and the thermal insulation part 200, so that the pole 100 and the thermal insulation part 200 can be quickly and accurately assembled together, reducing the trial and error cost and adjustment time in the assembly process, and improving the assembly efficiency.

[0058] Of course, the first positioning part 110 and the second positioning part 210 are not limited to the above forms. For example, the first positioning part 110 and the second positioning part 210 can also be in the form of a buckle and a slot. The first positioning part 110 is a buckle structure protruding outward on the pole 100. The buckle can have a certain elasticity and shape design, such as a barb shape or a wedge shape, so that it can provide reliable fixing force when matched with the thermal insulation part 200. The second positioning part 210 is a slot provided on the thermal insulation part 200 corresponding to the position of the buckle of the pole 100. The shape and size of the slot match the buckle, so that the buckle can be smoothly buckled and form a tight fit. After the buckle is buckled into the slot, a certain friction and clamping force is generated, which limits the relative movement of the pole 100 and the thermal insulation part 200 in various directions, and plays a good positioning and fixing role. Or in the form of a dovetail groove and a dovetail block. The first positioning part 110 is a dovetail block structure machined on the pole 100. The cross section of the dovetail block is trapezoidal or similar trapezoidal shape, and the inclined edge can provide guiding and positioning functions. The second positioning part 210 is a dovetail groove made on the thermal insulation part 200 to match the dovetail block. The shape and size of the dovetail groove are accurately matched with the dovetail block. When the dovetail block is inserted into the dovetail groove, accurate positioning in multiple directions can be achieved. Moreover, the characteristics of the dovetail structure make the connection between the pole 100 and the thermal insulation part 200 more stable, and it is not easy to loosen or fall off, especially when resisting external forces parallel to the arrangement direction of the pole 100 and the thermal insulation part 200, it has good stability.

[0059] In one possible embodiment, the thermal insulation part 200 and the upper plastic 300 are integrally formed by an injection molding process.

[0060] The heat insulation and insulation material is generally engineering plastic, ceramic powder filled plastic, etc. with good heat insulation and insulation performance. The plastic material is selected according to the specific performance requirements of the product, such as strength, toughness, heat resistance, etc. Different types of plastics such as polypropylene (PP), polycarbonate (PC), polystyrene (PS), etc. are selected.

[0061] The heat insulation and insulation part 200 and the upper plastic 300 are integrally formed by the injection molding process, and a firm bonding interface is formed between the two, which eliminates the problems of loose connection and falling off that may occur in traditional connection methods (such as bonding, riveting, etc.), greatly improving the stability and reliability of the overall structure. The integrally formed structure can better withstand external forces and stress distribution. When the product is subjected to impact, vibration or other external forces, the force can be more evenly transmitted to the entire structure, reducing local stress concentration and thus reducing the risk of product damage. In addition, during the injection molding process, the heat insulation and insulation material and the plastic can fully fuse to form a continuous and uniform heat insulation and insulation layer, avoiding defects such as gaps and gaps that may occur due to the use of a separate structure, thereby improving the heat insulation and insulation effect. Compared with the traditional process of separately manufacturing the heat insulation and insulation part 200 and the upper plastic 300 and then assembling them, the integrally formed process reduces the intermediate assembly steps, greatly shortens the production cycle, and improves the production efficiency.

[0062] In one possible embodiment, referring to Figure 1 and Figure 3 The heat insulation and insulation part 200 is provided with an injection molding embedded hole 220, so that when the heat insulation and insulation part 200 and the upper plastic 300 are integrally formed by the injection molding process, the upper plastic 300 forms an embedded part 310 in the injection molding embedded hole 220.

[0063] The heat insulation and insulation part 200 is provided with an injection molding embedded hole 220, so that when the heat insulation and insulation part 200 and the upper plastic 300 are integrally formed by the injection molding process, the upper plastic 300 forms an embedded part 310 in the injection molding embedded hole 220.

[0064] In addition, the close embedding structure can reduce the gap between the two, reduce the possibility of heat transfer and electric field leakage, help to improve the overall thermal insulation and insulation performance of the thermal insulation and insulation part 200 and the upper plastic 300, better meet the requirements of electrical safety and thermal management of devices such as batteries, and ensure that the battery will not abnormally transfer heat during charging and discharging, and the current will not leak.

[0065] In addition, the injection molding embedded hole 220 can provide clear filling guidance for the injection molding process, making it easier for plastic to flow into and fill a specific area, reducing the difficulty of injection molding, improving the success rate of injection molding, reducing defects such as bubbles and cavities caused by uneven injection molding, and improving product quality.

[0066] In one possible embodiment, referring to Figure 1 and Figure 3 The injection molding embedded hole 220 is in communication with the insertion slot, and there is a gap between the insertion protrusion and the embedded part 310.

[0067] The injection molding embedded hole 220 is in communication with the insertion slot, providing clearer and more accurate guidance for the assembly process. When assembling the pole 100 and the thermal insulation and insulation part 200, the operator can first align the insertion protrusion with the insertion slot. Since the two are in communication, the insertion action can be completed more smoothly, ensuring that the positioning of the pole 100 and the thermal insulation and insulation part 200 in the first direction is more accurate, improving the efficiency and accuracy of the assembly, and the gap between the insertion protrusion and the embedded part 310 provides a certain tolerance space during assembly. Even if there are some minor dimensional errors in the machining process of the parts, the gap can be used for fine tuning to ensure that the pole 100 and the thermal insulation and insulation part 200 can be assembled smoothly, reducing the probability of assembly difficulty or failure due to dimensional deviation.

[0068] In addition, the existence of the gap can play a certain buffering role. When the product is subjected to external forces such as vibration and impact during use, the gap between the insertion protrusion and the embedded part 310 can absorb part of the energy, reducing the transmission of vibration and impact force between the pole 100 and the thermal insulation and insulation part 200, thereby protecting the pole 100 and the thermal insulation and insulation part 200 from damage, improving the stability and reliability of the product, and the pole 100 and the thermal insulation and insulation part 200 may change in size due to thermal expansion and contraction at different working environment temperatures. The gap between the insertion protrusion and the embedded part 310 can provide compensation space for such thermal expansion, avoiding excessive stress between the pole 100 and the thermal insulation and insulation part 200 due to thermal expansion, preventing deformation, cracking and other problems, and ensuring that the product can work normally under different temperature conditions.

[0069] In one possible embodiment, referring to Figure 4 and Figure 5The surface of the thermal insulation piece 200 facing the upper plastic 300 is provided with a plurality of protrusions 230, which can be embedded in the upper plastic 300 when the thermal insulation piece 200 and the upper plastic 300 are integrally formed by the injection molding process.

[0070] The thermal insulation piece 200 is provided with a plurality of protrusions 230 on the surface facing the upper plastic 300. During the injection molding process, the protrusions 230 can guide the flow direction of the upper plastic 300, making it easier for the plastic to fill into every corner and gap of the mold, helping to reduce defects such as bubbles and material shortages during the injection molding process, improving the quality and success rate of injection molding, ensuring the appearance and dimensional accuracy of the product, and providing more attachment points and anchoring positions for the upper plastic 300, allowing it to better combine with the thermal insulation piece 200 during the curing process. This helps to improve the bonding force between the two, ensuring that after the injection molding is completed, the thermal insulation piece 200 and the upper plastic 300 can form a solid whole, reducing quality problems caused by poor bonding, thereby significantly improving the stability and reliability of the overall structure. When the overall structure is subjected to external forces, these protrusions 230 can disperse stress to a larger area and more contact points, avoiding stress concentration in a certain part, reducing the risk of material rupture or connection failure caused by stress concentration, allowing the product to withstand greater external forces and more complex use environments.

[0071] In addition, the presence of the protrusions 230 makes the heat transfer path between the thermal insulation piece 200 and the upper plastic 300 more tortuous and complex, requiring more media and interfaces during heat transfer, thereby increasing thermal resistance and improving overall thermal insulation performance, more effectively preventing heat transfer between the two, helping to maintain temperature stability inside the product.

[0072] In one possible embodiment, the thickness of the thermal insulation piece 200 is 0.1mm-3mm.

[0073] This thickness range can provide sufficient thermal resistance to prevent heat transfer through the thermal insulation piece 200, while the overall thickness of the thermal insulation piece 200 within the range of 0.1mm-3mm is relatively easy to install and assemble, without causing assembly difficulties or affecting the compactness of the overall structure due to excessive thickness, which can reduce the difficulty and workload during installation, improving production efficiency.

[0074] For example, if the cross section of the thermal insulation piece 200 is circular, its diameter can be adjusted between 10-50mm according to the needs of the battery cell. The circular cross section has the smallest circumference under the same area, which can reduce the contact area with the external environment and reduce the efficiency of heat transfer. Adjusting the diameter according to the needs of the battery cell can further optimize the heat transfer path between the thermal insulation piece 200 and the battery cell, effectively prevent the exchange of heat between the battery cell and the surrounding environment, improve the thermal stability of the battery system, and reduce the problem of battery performance degradation and life shortening caused by excessive high or low temperature.

[0075] In one possible embodiment, the thermal insulation piece 200 has a microscopic honeycomb structure inside.

[0076] Therefore, there are a large number of closed micro air chambers in the microscopic honeycomb structure, and the thermal conductivity of air is extremely low. These chambers act as small thermal insulation units, effectively preventing heat transfer, greatly increasing the thermal resistance of the thermal insulation piece 200, and significantly improving the thermal insulation effect. The small chambers of the honeycomb structure restrict the flow of air and greatly inhibit the phenomenon of heat convection. It is difficult for heat to be transferred inside the thermal insulation piece 200 through the flow of air, thereby further improving the thermal insulation performance.

[0077] The application also provides a battery, which comprises the above-mentioned pole assembly 1, a shell, a cover plate, and a battery cell arranged in the shell. The cover plate is arranged at the opening of the shell, and the pole assembly 1 is arranged on the cover plate.

[0078] The battery cell in the shell is electrically connected with the pole 100. When the pole 100 is electrically connected with an external circuit, the battery cell is electrically connected with the external circuit through the pole 100. The end face of the upper plastic 300 away from the thermal insulation piece 200 is adhered to the cover plate by an adhesive.

[0079] The pole assembly 1 in the application can have the same structure as the pole assembly 1 in the above-mentioned embodiments and can bring the same or similar beneficial effects. For details, refer to the description of the above-mentioned embodiments, which will not be repeated here.

[0080] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A terminal assembly used in a battery, the battery comprising a cover plate and a cell, characterized in that, The pole assembly comprises: a pole for connecting the electric cell with an external circuit; a heat insulation piece arranged at the end of the pole towards the cover plate; an upper plastic arranged at the side of the heat insulation piece away from the pole, the side of the upper plastic away from the heat insulation piece being used for connecting with the cover plate.

2. The pole assembly of claim 1, wherein, The heat insulation piece is a ceramic piece.

3. The pole assembly of claim 1, wherein, The pole is provided with a first positioning part, and the heat insulation piece is provided with a second positioning part, the first positioning part and the second positioning part being matched to position the pole on the heat insulation piece in a first direction, the first direction being perpendicular to the arrangement direction of the pole and the heat insulation piece.

4. The pole assembly of claim 3, wherein, The first positioning part is a plug-in protrusion extending towards the heat insulation piece, and the second positioning part is a plug-in groove matched with the plug-in protrusion in the arrangement direction of the pole and the heat insulation piece.

5. The pole assembly of claim 4, wherein, The heat insulation piece and the upper plastic are integrally formed by an injection molding process.

6. The pole assembly of claim 5, wherein, The heat insulation piece is provided with an injection molding embedded hole, so that when the heat insulation piece and the upper plastic are integrally formed by an injection molding process, the upper plastic forms an embedded part in the injection molding embedded hole.

7. The pole assembly of claim 6, wherein, The injection molding embedded hole is communicated with the plug-in groove, and the plug-in protrusion and the embedded part have a gap therebetween.

8. The pole assembly of claim 5, wherein, The surface of the heat insulation piece towards the upper plastic is provided with a plurality of convex parts, so that when the heat insulation piece and the upper plastic are integrally formed by an injection molding process, the plurality of convex parts can be embedded in the upper plastic.

9. The pole assembly of claim 1, wherein, The thickness of the heat insulation piece is 0.1-3 mm.

10. A battery, characterized by The battery comprises: the pole assembly of any one of claims 1-9; a shell; a cover plate arranged at the opening of the shell, the pole assembly being arranged on the cover plate; an electric cell arranged in the shell.

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