Pole component, cover plate assembly, battery, battery pack and electric equipment

Abstract

The utility model discloses a pole assembly, a cover plate assembly, a battery, a battery pack and electric equipment, the pole assembly comprises a pole and a protection piece, a tab is connected between the pole and the protection piece, and at least one of the pole and the protection piece is provided with a convex part protruding towards the tab. According to the pole assembly disclosed by the embodiment of the utility model, at least one of the pole and the protection piece is provided with the convex part which protrudes towards the pole lug, so that the contact area between the pole lug and the pole or the protection piece can be increased, the pole lug can be better connected between the pole and the protection piece, and the connection reliability of the pole lug can be improved; and therefore, the stability of overcurrent between the tab and the pole is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic batteries, in particular to a pole column assembly, a cover plate assembly, a battery, a battery pack and an electrical equipment. Background Art

[0002] The power battery technology is the top priority of the development of new energy vehicle technology. In related technologies, the connection between the tab and the cover plate is often relatively complex, and after the tab is connected to the cover plate, the connection reliability will affect the stability of current passing between the tab and the pole column. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a pole column assembly with high connection reliability of the tab.

[0004] The pole column assembly according to the embodiment of the utility model includes: a pole column and a protection member, the tab is welded between the pole column and the protection member, and at least one of the pole column and the protection member has a convex portion protruding towards the tab.

[0005] For the pole column assembly according to the embodiment of the utility model, by providing at least one of the column and the protection member with a convex portion protruding towards the tab, the contact area between the tab and the pole column or the protection member can be increased, so that the tab can be better connected between the pole column and the protection member, the connection reliability of the tab can be improved, and further the stability of current passing between the tab and the pole column is facilitated.

[0006] In addition, the pole column assembly according to the utility model may further have the following additional technical features:

[0007] In some embodiments of the utility model, at least one of the convex portions is provided on one of the pole column and the protection member, and a concave portion cooperating with the convex portion is provided on the other of the pole column and the protection member.

[0008] In some embodiments of the utility model, there are a plurality of the convex portions and a plurality of the concave portions, and the plurality of convex portions and the plurality of concave portions correspond to each other one by one.

[0009] In some embodiments of the utility model, a groove is provided on the pole column, at least part of the protection member is located in the groove, and the groove is the concave portion.

[0010] In some embodiments of the utility model, the protection members located in the groove are all configured as the convex portions.

[0011] In some embodiments of the utility model, a convex portion is provided on the bottom wall of the groove, which is the first convex portion.

[0012] In some embodiments of the present utility model, the convex portion provided on the protection member is a second convex portion, and the first convex portion and the second convex portion are arranged in a staggered manner.

[0013] In some embodiments of the present utility model, a first concave portion cooperating with the second convex portion is provided on the bottom wall of the groove, and the first concave portion is defined by the first convex portion and the side wall of the groove.

[0014] In some embodiments of the present utility model, at least two second convex portions are provided, and a second concave portion cooperating with the first convex portion is formed between the two second convex portions.

[0015] In some embodiments of the present utility model, both the first convex portion and the second convex portion are strip-shaped extending in a first direction.

[0016] In some embodiments of the present utility model, the outer peripheral edge of the end portion of the convex portion facing the tab has a chamfer, and the chamfer is an arc angle, a right angle, an acute angle or an obtuse angle.

[0017] In some embodiments of the present utility model, the surface of the protection member facing away from the tab has a coating.

[0018] In some embodiments of the present utility model, the thickness D of the protection member satisfies: 0.2 mm ≤ D ≤ 5 mm.

[0019] In some embodiments of the present utility model, the protruding height h of the first convex portion satisfies: 0 < h < 5 mm; and / or, the protruding height d of the second convex portion satisfies: 0 < d < 5 mm.

[0020] In some embodiments of the present utility model, the tab is connected between the pole column and the protection member by resistance welding.

[0021] In some embodiments of the present utility model, the melting point of the protection member is higher than the melting point of the tab.

[0022] The present utility model also proposes a cover assembly having the pole column assembly of the above embodiments.

[0023] The cover assembly according to the embodiment of the present utility model includes a cover and a pole column assembly. A pole column hole is provided on the cover, and the pole column is installed in the pole column hole for electrically connecting with the tab.

[0024] For the cover assembly according to the embodiment of the present utility model, by providing the pole group assembly of the above embodiments, it is beneficial to the electrical connection between the tab and the pole column, and the connection method is simple, the connection reliability is high, and the production cost can also be reduced.

[0025] In some embodiments of the present utility model, the cover plate includes: a cover plate body, on which a pole hole is provided; an insulating member disposed between the cover plate body and the pole.

[0026] In some embodiments of the present utility model, the insulating member includes: a first plate body, a second plate body, and an insulating ring. The first plate body and the second plate body are respectively located on both sides of the cover plate body, and the insulating ring is located in the pole hole for separating the pole from the cover plate body.

[0027] The present utility model also provides a battery having the cover plate assembly of the above embodiments.

[0028] The battery according to the embodiments of the present utility model includes a housing, a cover plate assembly, and an electrode assembly. The housing has an opening, the cover plate assembly is disposed at the opening, and the electrode assembly is disposed inside the housing. The electrode assembly has a tab, and the end of the tab is fixed between a protection member and a pole for electrically connecting to the pole.

[0029] For the battery according to the embodiments of the present utility model, by providing the cover plate assembly of the above embodiments, the tab of the electrode assembly can be better electrically connected to the pole, and the connection method is simple and the connection reliability is high. Moreover, the production cost can be reduced, thereby reducing the cost of the battery.

[0030] The present utility model also provides a battery pack having the cover plate assembly of the above embodiments or the battery of the above embodiments.

[0031] For the battery pack according to the embodiments of the present utility model, by providing the cover plate assembly of the above embodiments, the tab of the electrode assembly can be better electrically connected to the pole, and the connection method is simple and the connection reliability is high. Moreover, the production cost can be reduced, thereby reducing the cost of the battery. The present utility model also provides an electrical device having the battery of the above embodiments or the battery pack of the above embodiments.

[0032] For the electrical device according to the embodiments of the present utility model, by providing the battery or the battery pack of the above embodiments, the cost and reliability of the electrical device can be better reduced by reducing the cost of the battery and improving the reliability of the battery.

[0033] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0035] Figure 1It is a schematic structural diagram of a cover assembly according to an embodiment of the present utility model.

[0036] Figure 2 It is an exploded view of the cover assembly according to an embodiment of the present utility model from one angle.

[0037] Figure 3 It is an exploded view of the cover assembly according to an embodiment of the present utility model from another angle.

[0038] Figure 4 is Figure 3 an enlarged view of area A in

[0039] Reference numerals:

[0040] pole column assembly 10,

[0041] pole column 1, groove 11, first convex portion 12, first concave portion 13,

[0042] protective member 2, second convex portion 21, second concave portion 22,

[0043] cover plate 20,

[0044] cover plate body 3, pole column hole 31,

[0045] insulating member 4, first plate body 41, second plate body 42, insulating ring 43.

[0046] cover assembly 100,

[0047] pole ear 5, first direction X1, second direction X2. Detailed implementation manners

[0048] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0049] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0050] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0051] Power battery technology is the top priority in the development of new energy vehicle technology. Battery connection technology, especially welding technology, is a key link in battery manufacturing technology. The design of the welding structure and the process stability directly affect the reliability of the connection. Exemplarily, for a square lithium-ion battery, the welding process between its tab and the cover plate is a key process in the production of battery cells, and the reliability of its connection directly affects the overcurrent capacity of the battery.

[0052] In the related art, when welding the tab to the cover plate, most use a soft connection piece for transition. This process has problems such as a large number of welding times, a high risk of false soldering, a relatively large ohmic impedance, and a large amount of metal debris. It is easy to cause a relatively high internal resistance of the battery and a relatively high temperature during charge and discharge, and the metal debris has a serious impact on battery safety.

[0053] In addition, the presence of the soft connection piece occupies the internal space of the battery, resulting in a low volumetric energy density of the battery; and the soft connection piece needs to be bent, which reduces the production efficiency and increases the equipment investment cost.

[0054] Based on this, the present application proposes a terminal assembly 10. Through the structural design of the terminal 1 and the protection member 2, the terminal assembly 10 of the present application can complete the welding of the terminal 1 and the tab 5 only by one-time resistance welding. The welding process is simple, the welding is reliable, and the generation of metal debris can be reduced, which is beneficial to battery safety. Moreover, the protection member 2 of the present application does not require bending treatment, has a small volume, is not likely to occupy the internal space of the battery, is beneficial to improving the volumetric energy density of the battery, and can also reduce production costs.

[0055] Reference is made below to Figures 1-4 describe the terminal assembly 10 according to an embodiment of the present invention.

[0056] As Figures 1-4 shown, the terminal assembly 10 according to an embodiment of the present invention includes a terminal 1 and a protection member 2. A tab 5 is connected between the terminal 1 and the protection member 2, and at least one of the terminal 1 and the protection member 2 has a convex portion protruding toward the tab 5.

[0057] Exemplarily, the terminal 1 is provided with a convex portion protruding toward the tab 5.

[0058] Exemplarily, the protection member 2 is provided with a convex portion protruding toward the tab 5.

[0059] Exemplarily, both the terminal 1 and the protection member 2 are provided with convex portions protruding toward the tab 5.

[0060] In the above examples, by providing the convex portion, the contact area between the tab 5 and the terminal 1 or the protection member 2 can be increased, so that the tab 5 can be better connected between the terminal 1 and the protection member 2, the reliability of the connection of the tab 5 can be improved, and further the stability of the current flow between the tab 5 and the terminal 1 is beneficial.

[0061] Thus, for the terminal assembly according to an embodiment of the present invention, by having at least one of the post 1 and the protection member 2 with a convex portion protruding toward the tab 5, the contact area between the tab 5 and the terminal 1 or the protection member 2 can be increased, so that the tab 5 can be better connected between the terminal 1 and the protection member 2, the reliability of the connection of the tab 5 can be improved, and further the stability of the current flow between the tab 5 and the terminal 1 is beneficial.

[0062] Exemplarily, the tab 5 can be welded between the terminal 1 and the protection member 2, and the welding method can be laser welding, resistance welding, ultrasonic welding, etc., which are not limited in the present application; Exemplarily, the tab 5 can be bonded between the terminal 1 and the protection member 2. It can be understood that there are also various connection methods for the tab 5, which are not limited in the present application.

[0063] In some embodiments of the present invention, the tab 5 is connected between the terminal and the protection member by resistance welding. Refer to the attached Figure 2As shown, the protective member 2 is located on the side of the pole column 1 facing the electrode assembly. The electrode assembly has a tab 5. The end of the tab 5 can be placed between the pole column 1 and the protective member 2 and then welded by resistance welding. Resistance welding is a welding method that uses the resistance heat generated by the current passing through the contact surface and adjacent areas of the welded parts as the heat source. In this process, heat is generated in the welded area of the welded parts due to the current flowing through, and at the same time, pressure is applied to make the contact surfaces fit tightly, so as to achieve local heating and melting or reach the plastic state, and a firm welded joint is formed after cooling. During welding, the conductive member can overlap with the protective member 2, which can prevent the conductive member from directly acting on the tab 5 and avoid the problem of the conductive member sticking to the electrode of the tab 5.

[0064] Furthermore, by providing a convex portion protruding towards the tab 5 on at least one of the pole column 1 and the protective member 2, the convex portion can increase the actual contact area with the tab 5 when abutting against the tab 5. Moreover, when the convex portion contacts the tab 5, a point contact or line contact state can be constructed between the convex portion and the tab 5, which is conducive to the rapid accumulation of heat generated at the position of the point contact or line contact, thus facilitating the rapid heating and melting of the material, forming a reliable welding point, and further enabling the tab 5 to be firmly fixed on the pole column 1, realizing the electrical connection between the tab 5 and the pole column 1. Therefore, the welding process is simple, the welding is reliable, and the generation of metal debris can be reduced, which is beneficial to battery safety. In addition, the protective member 2 of the present application does not require bending treatment, has a small volume, is not easy to occupy the internal space of the battery, is beneficial to improving the volume energy density of the battery, and can also reduce production costs.

[0065] Exemplarily, the convex portion can be provided on the pole column 1, or on the protective member 2, or on both the pole column 1 and the protective member 2. The present application does not make any restrictions.

[0066] According to the pole column assembly 10 of the embodiment of the present utility model, by providing the protective member 2 and having a convex portion protruding towards the protective member 2 on at least one of the pole column 1 and the protective member 2, the pole column 1 can be welded to the tab 5 only once by resistance welding, the welding process is simple, the welding is reliable, and the generation of metal debris can be reduced, which is beneficial to battery safety. In addition, the protective member 2 of the present application does not require bending treatment, has a small volume, is not easy to occupy the internal space of the battery, is beneficial to improving the volume energy density of the battery, and can also reduce production costs.

[0067] Exemplarily, the tab 5 can include multiple layers of foil materials, which can improve the current-carrying capacity, reduce the resistance, thereby reducing the heat loss and voltage drop inside the battery, and improving the overall efficiency of the battery.

[0068] In some embodiments of the present utility model, such as Figures 1-4As shown, at least one convex part is provided on one of the terminal post 1 and the protective member 2. That is to say, there can be one convex part, or two or more convex parts. This application does not make any restrictions.

[0069] Further, the other of the terminal post 1 and the protective member 2 is provided with a concave part that cooperates with the convex part.

[0070] Exemplarily, a convex part is provided on the terminal post 1, and a concave part corresponding to and cooperating with the convex part is provided on the protective member 2.

[0071] Exemplarily, a concave part is provided on the terminal post 1, and a convex part corresponding to and cooperating with the concave part is provided on the protective member 2.

[0072] Exemplarily, the convex part provided on the terminal post 1 is the first convex part 12, the concave part provided is the first concave part 13, the second concave part 22 corresponding to the first convex part 12 is provided on the protective member 2, and the second convex part 21 corresponding to the first concave part 13 is provided.

[0073] In the above examples, by providing the convex part and the concave part corresponding to and cooperating with the convex part, the terminal post 1 and the protective member 2 can be mutually engaged, so that the tab 5 is relatively compact after being welded between the terminal post 1 and the protective member 2, and the reliability after welding is high.

[0074] Exemplarily, there are multiple convex parts and multiple concave parts, and the multiple convex parts and the multiple concave parts correspond to each other one by one. Through the corresponding cooperation of the multiple convex parts and the multiple concave parts, the reliability of the tab 5 after being welded between the terminal post 1 and the protective member 2 can be further improved.

[0075] In some embodiments of the present utility model, as Figures 1-4 shown, a groove 11 is provided on the terminal post 1, at least part of the protective member 2 is located in the groove 11, and the groove 11 is a concave part. Thus, the occupation of the internal space of the battery by the protective member 2 can be reduced, which is beneficial to improving the volumetric energy density of the battery. In addition, the cooperation between the protective member 2 and the groove 11 can also increase the contact area between the tab 5 and the protective member 2 and between the tab 5 and the terminal post 1. And when the tab 5 is located between the protective member 2 and the terminal post 1, a corner in contact with the tab 5 can be added at the opening of the groove 11, so as to be beneficial to increasing the number of point contacts or line contacts with the tab 5. Therefore, when welding is performed by resistance welding, reliable welding points between the terminal post 1 and the tab 5 can be increased, and further the tab 5 is firmly fixed on the terminal post 1.

[0076] Exemplarily, as Figures 2-4 shown, a convex part, i.e., the first convex part 12, is provided on the bottom wall of the groove 11. That is to say, the first convex part 12 can be further provided on the bottom wall of the groove 11, and a good welded connection can be achieved between the first convex part 12 and the tab 5, and the reliability after welding is high.

[0077] Exemplarily, as Figures 2-4 shown, a convex portion provided on the protective member 2 is a second convex portion 21, and the first convex portion 12 and the second convex portion 21 are arranged in a staggered manner. Thus, through the first convex portion 12 and the second convex portion 21, the welding effect of the tab 5 can be further improved, so that the pole column 1, the tab 5 and the protective member 2 can be welded into a whole better.

[0078] Exemplarily, as Figures 2-4 shown, a first concave portion 13 that cooperates with the second convex portion 21 is provided on the bottom wall of the groove 11, and the first concave portion 13 is defined by the first convex portion 12 and the side wall of the groove 11. The structure is simple, and the second convex portion 21 can be better fitted with the first concave portion 13, thereby improving the reliability after welding.

[0079] Exemplarily, as Figures 2-4 shown, at least two second convex portions 21 are provided, and a second concave portion 22 that cooperates with the first convex portion 12 is formed between the two second convex portions 21.

[0080] As Figures 2-4 shown, in the second direction X2, two second convex portions 21 are provided, and a second concave portion 22 is formed between the two second convex portions 21. The structure is simple, and through the cooperation of the first convex portion 12 and the second concave portion 22, the protective member 2 and the pole column 1 can be better fitted, and the reliability after welding can be improved.

[0081] Exemplarily, as Figures 2-4 shown, the first convex portion 12 is a long strip extending along the first direction X1. Thus, a better area of point contact or line contact can be increased between the first convex portion 12 and the tab 5, so that the reliability is higher when the first convex portion 12 and the tab 5 are welded.

[0082] Exemplarily, as Figures 2-4 shown, the second convex portion 21 is a long strip extending along the first direction X1. Thus, a better area of point contact or line contact can be increased between the second convex portion 21 and the tab 5, so that the reliability is higher when the second convex portion 21 and the tab 5 are welded.

[0083] In some embodiments of the present invention, the protective member 2 located in the groove 11 is configured as a convex portion.

[0084] Exemplarily, the protective member 2 can be a cuboid block structure. The protective member 2 can be completely located in the groove 11 or can be completely located in the groove 11. The protective member 2 can be located in the groove 11. Therefore, the whole of the protective member 2 can be configured as a convex portion, and a region of point contact or line contact can appear between the outer peripheral edge of the end of the protective member 2 facing the groove 11 and the tab 5 better, so that the protective member 2 can be welded to the tab 5 more reliably.

[0085] In some embodiments of the present utility model, the outer peripheral edge of the convex portion facing the end of the tab 5 has a chamfer, and the chamfer is a circular arc angle, a right angle, an acute angle or an obtuse angle. Thus, the area of point contact or line contact between the convex portion and the tab 5 can be better increased, thereby improving the reliability during the welding of the convex portion and the tab 5.

[0086] In some embodiments of the present utility model, the surface of the protective member 2 facing away from the tab 5 has a coating. Exemplarily, the coating, such as materials like nickel, chromium or Teflon, has the characteristic of low surface energy, which can significantly reduce the adhesion force between the protective member 2 and the electrode head. In this way, after the welding is completed, the electrode head is more likely to detach from the welding site, reducing the frequency and difficulty of cleaning the electrode head and extending the service life of the electrode head. Additionally, the coating can serve as a barrier to prevent the electrode head from directly contacting the welding material at high temperature for a long time, thereby preventing oxidation, wear or loss, protecting the material of the electrode head, and maintaining its good electrical conductivity and shape stability; the uniform coating can improve the distribution of current, making the welding energy more concentrated in the predetermined welding area, reducing welding spatter, and improving the consistency and welding strength of the welding points.

[0087] In some embodiments of the present utility model, the thickness D of the protective member 2 satisfies: 0.2 mm ≤ D ≤ 5 mm. Meeting the above conditions, the protective member 2 can better protect the tab 5 in the welding area, and during welding with the electrode head, the protective member 2 meeting the above conditions can absorb and disperse a large amount of heat generated during the welding process. In this way, the temperature rise in the area directly contacting the electrode head will not be too fast or too high, reducing the phenomenon of sticking welding caused by overheating of the electrode head. Additionally, the protective member 2 meeting the above conditions helps the current to be more evenly distributed over a larger area, reducing the concentration of current density at a certain point, thereby reducing the risk of local overheating and reducing electrode adhesion.

[0088] Exemplarily, the protective member 2 is an integrally formed metal sheet.

[0089] In some embodiments of the present utility model, the protruding height h of the first convex portion 12 satisfies: 0 < h < 5 mm. Thus, the first convex portion 12 can be welded to the tab 5 better.

[0090] In some embodiments of the present utility model, the protruding height d of the second convex portion 21 satisfies: 0 < d < 5 mm. Thus, the second convex portion 21 can be welded to the tab 5 better.

[0091] In some embodiments of the present utility model, the groove depth H of the groove 11 and the thickness D of the protection member 2 satisfy: H = D + h + the thickness of the hot melting of the tab. Thus, the protection member 2 and the pole column 1 can be better fitted with each other, and the connection reliability is good. Exemplarily, h = d, which is beneficial to the misaligned fitting of the first convex portion 12 and the second convex portion 21, thereby better improving the connection reliability.

[0092] In some embodiments of the present utility model, the melting point of the protection member 2 is higher than that of the tab 5. It can be understood that the direct contact between the tab 5 and the welding head may cause the tab material (usually metal) to melt and adhere to the welding head at high temperatures, which will not only affect the welding quality but also cause pollution and damage to the welding head. Using the protection member 2 with a melting point higher than that of the tab material can form a heat insulation layer between the tab 5 and the welding head to prevent the tab material from overheating and melting and sticking.

[0093] The present utility model also provides a cover assembly 100 having the pole column assembly 10 of the above embodiments.

[0094] As Figures 2-4 shown, the cover assembly 100 according to the embodiments of the present utility model includes a cover plate 20 and a pole column assembly 10. A pole column hole 31 is provided on the cover plate 20, and the pole column 1 is installed in the pole column hole 31 for electrically connecting with the tab 5.

[0095] For the cover assembly 100 according to the embodiments of the present utility model, by providing the pole group assembly of the above embodiments, it is beneficial to the electrical connection between the tab 5 and the pole column 1, the connection method is simple, the connection reliability is high, and the production cost can also be reduced.

[0096] In some embodiments of the present utility model, as Figures 2-4 shown, the cover plate 20 includes: a cover plate body 3 and an insulating member 4. The cover plate body 3 is a metal member, such as aluminum, steel, copper, etc., and the present application does not make any restrictions.

[0097] As Figures 2-4 shown, a pole column hole 31 is provided on the cover plate body 3, and the insulating member 4 is provided between the cover plate body 3 and the pole column 1. By providing the insulating member 4, a short circuit between the cover plate body 3 and the pole column 1 can be avoided.

[0098] In some embodiments of the present utility model, as Figures 2-4 shown, the insulating member 4 includes: a first plate body 41, a second plate body 42 and an insulating ring 43. The first plate body 41 and the second plate body 42 are respectively located on both sides of the cover plate body 3, and the insulating ring 43 is located in the pole column hole 31 for separating the pole column 1 and the cover plate body 3.

[0099] Exemplarily, as Figures 2-4As shown in the figure, the first plate body 41 is located on the side of the cover plate body 3 facing the electrode assembly. The size of the first plate body 41 is substantially the same as that of the cover plate body 3. The first plate body 41 can preferably insulate the cover plate body 3 and the electrode assembly. The second plate body 42 is located on the side of the cover plate body 3 facing away from the electrode assembly. The second plate body 42 can preferably insulate the pole column 1 and can also protect the outer peripheral side of the pole column 1.

[0100] The present utility model also provides a battery having the cover plate assembly 100 of the above embodiment.

[0101] The battery according to the embodiment of the present utility model includes a housing, a cover plate assembly 100 and an electrode assembly. The housing has an opening, the cover plate assembly 100 is disposed at the opening, and the electrode assembly is disposed inside the housing. The electrode assembly has a tab 5, and the end of the tab 5 is fixed between the protection member 2 and the pole column 1 for electrically connecting with the pole column 1.

[0102] For the battery according to the embodiment of the present utility model, by providing the cover plate assembly 100 of the above embodiment, the tab 5 of the electrode assembly can be preferably electrically connected with the pole column 1, and the connection method is simple, the connection reliability is high, the production cost can be reduced, and thus the cost of the battery can be reduced.

[0103] The present utility model also provides a battery pack having the cover plate assembly 100 of the above embodiment or the battery of the above embodiment.

[0104] For the battery pack according to the embodiment of the present utility model, the tab 5 of the electrode assembly can be preferably electrically connected with the pole column 1, and the connection method is simple, the connection reliability is high, the production cost can be reduced, and thus the cost of the battery pack can be reduced.

[0105] The present utility model also provides an electrical device having the battery of the above embodiment or the battery pack of the above embodiment.

[0106] For the electrical device according to the embodiment of the present utility model, by providing the battery of the above embodiment or the battery pack of the above embodiment, by reducing the cost of the battery and improving the reliability of the battery, the cost and reliability of the electrical device can be preferably reduced.

[0107] For other configurations and operations of the pole column assembly 10, the cover plate assembly 100, the battery, the battery pack and the electrical device according to the embodiment of the present utility model are known to those of ordinary skill in the art and will not be described in detail here.

[0108] In the description of this specification, the descriptions referring to terms such as "some embodiments", "optionally", "furthermore" or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0109] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A terminal assembly for connecting the tab of a battery, characterized in that, Comprising: A terminal post and a protective member, with the tab connected between the terminal post and the protective member. At least one convex portion is provided on one of the terminal post and the protective member, and a concave portion cooperating with the convex portion is provided on the other of the terminal post and the protective member.

2. The pole column assembly according to claim 1, wherein, There are multiple convex portions and multiple concave portions, and the multiple convex portions and the multiple concave portions correspond to each other one by one.

3. The terminal post assembly according to any one of claims 1-2, characterized in that, A groove is provided on the terminal post, and at least a part of the protective member is located within the groove.

4. The pole column assembly according to claim 3, characterized in that, The convex portion provided on the bottom wall of the groove is the first convex portion.

5. The pole assembly according to claim 4, characterized in that, The convex portion provided on the protective member is the second convex portion, and the first convex portion and the second convex portion are arranged in a staggered manner.

6. The pole column assembly according to claim 5, characterized in that, A first concave portion cooperating with the second convex portion is provided on the bottom wall of the groove, and the first concave portion is defined by the first convex portion and the side wall of the groove.

7. The pole column assembly according to claim 5, characterized in that, There are at least two second convex portions, and a second concave portion cooperating with the first convex portion is constructed between the two second convex portions.

8. The pole column assembly according to any one of claims 5-7, characterized in that, Both the first convex portion and the second convex portion are elongated strips extending in a first direction.

9. The pole column assembly according to claim 3, characterized in that, The protective member located within the groove is all constructed as the convex portion, and the groove is the concave portion.

10. The pole column assembly according to claim 1, characterized in that, The outer peripheral edge of the end portion of the convex portion facing the tab has a chamfer, and the chamfer is an arc angle, a right angle, an acute angle or an obtuse angle.

11. The terminal assembly according to claim 1, wherein, The surface of the protective member facing away from the tab has a coating.

12. The pole column assembly according to claim 1, characterized in that, The thickness D of the protective member satisfies: 0.2 mm ≤ D ≤ 5 mm.

13. According to the terminal post assembly of claim 5, characterized in that The protruding height h of the first convex portion satisfies: 0 < h < 5 mm; and / or The protruding height d of the second convex portion satisfies: 0 < d < 5 mm.

14. The pole column assembly according to claim 1, characterized in that, The tab is connected between the terminal post and the protective member by resistance welding.

15. The pole column assembly according to claim 1, wherein, The melting point of the protective member is higher than the melting point of the tab.

16. A cover assembly, characterized in that, Comprising: A cover plate body, on which a terminal post hole is provided; The terminal post assembly according to any one of claims 1-15, and the terminal post is installed in the terminal post hole; An insulating member, which is provided between the cover plate body and the terminal post.

17. The cover assembly according to claim 16, wherein, The insulating member includes: A first plate body, a second plate body and an insulating ring. The first plate body and the second plate body are respectively located on both sides of the cover plate body, and the insulating ring is located within the terminal post hole for separating the terminal post from the cover plate body.

18. A battery, characterized in that, Comprising: A housing, which has an opening; A cover plate assembly, which is covered at the opening, and the cover plate assembly is the cover plate assembly according to any one of claims 16-17; An electrode assembly, which is provided within the housing. The electrode assembly has a tab, and the end portion of the tab is fixed between the protective member and the terminal post for electrically connecting with the terminal post.

19. A battery pack, characterized in that, Comprising the battery according to claim 18 or the cover plate assembly according to any one of claims 16-17.

20. An electrical device, characterized in that, Comprising the battery according to claim 18 or the battery pack according to claim 19.

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