Pole assembly, preparation method, cover plate structure, battery, battery device and power utilization device

Abstract

The embodiment of the invention provides a pole assembly, a preparation method, a cover plate structure, a battery, a battery device and a power utilization device, and relates to the technical field of batteries. The pole assembly comprises: an electrode terminal; the conductive part is provided with a first connecting hole penetrating through the conductive part, the electrode terminal is arranged in the first connecting hole in a penetrating mode, and a first gap is formed between the conductive part and the electrode terminal; and the brazing filler metal layer is located in the first gap, and the brazing filler metal layer is connected with the conductive part and the electrode terminal, so that stable connection between the electrode terminal and the conductive part is achieved through cooperation of the first gap and the brazing filler metal layer, and the probability of connection failure of the electrode terminal and the conductive part is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a pole assembly, a preparation method, a cover plate structure, a battery, a battery device, and an electrical device. Background Art

[0002] The pole assembly is an important component in the battery cover structure. It is electrically connected to the pole core to connect the battery with the external circuit to realize the charging and discharging of the battery.

[0003] The pole assembly usually includes a pole and a pressure plate. The pole is inserted into the pressure plate and connected to the pressure plate by first riveting and then welding the two.

[0004] In actual applications, the pressure plate and the pole are generally made of different materials, and the welds between the two are more likely to crack and fail, which will cause the mechanical impedance of the cover structure to increase, causing the cover structure to heat up and affecting the performance of the battery. Summary of the Invention

[0005] The embodiments of the present application provide a pole assembly, a preparation method, a cover plate structure, a battery, a battery device, and an electrical device to solve the problem of weld cracking and failure between the pressure plate and the pole.

[0006] In a first aspect, an embodiment of the present application provides a pole assembly, comprising:

[0007] Electrode terminals;

[0008] a conductive member, wherein a connecting assembly is provided on the conductive member, the electrode terminal is at least partially inserted into the connecting assembly, and a first gap is formed between the conductive member and the electrode terminal;

[0009] A solder layer is located in the first gap and is connected to the connection assembly and the electrode terminal.

[0010] In a possible implementation manner, the first gap is defined between at least a portion of an inner wall of the first connection hole and at least a portion of an outer wall of the electrode terminal.

[0011] In one possible embodiment, the first connecting hole includes a first hole segment and a second hole segment sequentially connected along the first direction, an orthographic projection of the first hole segment in the first direction is at least partially located outside the second hole segment, and a first connecting surface is formed between the first hole segment and the second hole segment;

[0012] The electrode terminal has a second connecting surface corresponding to the first connecting surface, the orthographic projection of the second connecting surface in the first direction at least partially overlaps with the first connecting surface, and the first connecting surface and the second connecting surface are spaced apart in the first direction to form the first gap.

[0013] In one possible implementation, the electrode terminal includes a first connecting segment and a second connecting segment connected to each other along the first direction, wherein an orthographic projection of the first connecting segment in the first direction is at least partially located outside the second connecting segment, so as to form the second connecting surface between the first connecting segment and the second connecting segment;

[0014] The second connecting section is at least partially located in the second hole section, and the first connecting section is at least partially located in the first hole section.

[0015] In a possible implementation manner, an outer wall of the first connecting segment and an inner wall of the first hole segment, and an interval is provided between the first connecting surface and the second connecting surface to form the first gap.

[0016] In one possible implementation, the electrode terminal further includes a third connecting segment, the third connecting segment being connected to an end of the second connecting segment facing away from the first connecting segment, and an orthographic projection of the second connecting segment in the first direction being at least partially located outside the third connecting segment, so as to form a third connecting surface between the third connecting segment and the second connecting segment.

[0017] The first connecting hole also includes a third hole segment, which is located at the end of the second hole segment away from the first hole segment, and the projection of the second hole segment in the first direction is at least partially located outside the third hole segment, so as to form a fourth connecting surface at the connection between the second hole segment and the third hole segment, and the fourth connecting surface is connected to the third connecting surface.

[0018] In a possible implementation, a ventilation hole is provided on the first connecting section, and the ventilation hole passes through the first connecting section along the first direction and is connected to the first gap.

[0019] In a possible embodiment, the first gap is an annular gap arranged around the outside of the electrode terminal. In the second direction, the distance from the inner edge to the outer edge of the first gap is greater than or equal to 0.5 mm, and the second direction is perpendicular to the first direction.

[0020] In a possible implementation manner, in the second direction, a ratio of a distance from an inner edge to an outer edge of the first gap to a size of the conductive member is greater than or equal to 0.05.

[0021] In a possible implementation manner, one of the electrode terminal and the conductive member is made of copper, and the other is made of aluminum.

[0022] In a possible implementation manner, the conductive member includes a conductive body and a connecting assembly for conductive connection, and the connecting assembly defines the first connecting hole.

[0023] In a second aspect, an embodiment of the present application provides a method for preparing a pole assembly, which is applied to the pole assembly described in any one of the first aspects, comprising:

[0024] Providing conductive parts;

[0025] Providing an electrode terminal, so that the electrode terminal is at least partially inserted into the first connection hole, and a first gap is formed between the conductive member and the electrode terminal;

[0026] placing a preset amount of solder in the first gap;

[0027] The solder is heated to a preset temperature to melt the solder and fill the first gap to form a solder layer, thereby obtaining the pole assembly.

[0028] In a possible implementation manner, the melting point of the solder is lower than the melting points of the electrode terminal and the conductive member.

[0029] In a possible implementation manner, one of the electrode terminal and the conductive member is made of copper, and the other is made of aluminum, and / or the melting point of the solder is less than 660°C.

[0030] In a third aspect, an embodiment of the present application provides a cover plate structure comprising a main body component and a pole assembly prepared by the pole assembly described in any one of the first aspects or the pole assembly preparation method described in any one of the second aspects, wherein the pole assembly is connected to the main body component.

[0031] In one possible embodiment, the main component includes a lead-out plate, the lead-out plate is provided with a second connecting hole, the second connecting hole includes a fourth hole segment and a fifth hole segment arranged sequentially along a first direction, an orthographic projection of the fifth hole segment in the first direction is at least partially located outside the fourth hole segment, and a fifth connecting surface is formed between the fifth hole segment and the fourth hole segment;

[0032] Wherein, a flange portion is provided at one end of the electrode terminal away from the conductive member, and the flange portion abuts against the fifth connecting surface.

[0033] In a possible implementation, the main component further includes:

[0034] an insulating gasket, wherein the insulating gasket is provided with a first limiting groove, and the conductive member is at least partially limitedly engaged with the first limiting groove;

[0035] a cover plate body, wherein the cover plate body is provided with a third connection hole and a second limiting groove, the electrode terminal passes through the third connection hole, a second gap is formed between the electrode terminal and the hole wall of the third connection hole, and the insulating gasket is at least partially disposed in the second limiting groove;

[0036] A sealing component is used to seal the gap between the cover plate body and the lead-out piece, and the sealing component partially extends into the second gap.

[0037] In some possible implementations, the main body component further includes a top spacer sleeved outside the electrode terminal, the top spacer being located between the cover plate body and the lead-out tab to separate the cover plate body from the lead-out tab;

[0038] The sealing component is partially embedded in the top spacer, and the lead piece partially passes through the gap between the top spacer and the electrode terminal and abuts against the sealing component.

[0039] In a fourth aspect, an embodiment of the present application provides a battery comprising a shell body and a pole core, and the pole column assembly described in any one of the first aspects or the cover structure described in any one of the second aspects or a cover structure prepared by the preparation method of the cover structure described in any one of the third aspects, wherein the pole core is located in the shell body, and the pole column assembly is electrically connected to the pole core.

[0040] In a fifth aspect, an embodiment of the present application provides a battery device comprising a housing and the battery described in the fourth aspect, wherein the battery is disposed within the housing.

[0041] In a sixth aspect, an embodiment of the present application provides an electrical device comprising the battery described in the fourth aspect or the battery device described in the fifth aspect.

[0042] The embodiments of the present application provide a pole assembly, a preparation method, a cover plate structure, a battery, a battery device, and an electrical device. The pole assembly includes an electrode terminal and a conductive member, the electrode terminal is at least partially inserted into a first connection hole on the conductive member, and a first gap is provided between the conductive member and the electrode terminal, and the solder layer is located in the first gap. By controlling the size of the first gap during design, the amount of solder used to form the solder layer can be more accurately controlled, so that the solder layer formed by melting the solder can be evenly filled in the first gap, thereby improving the uniformity of the weld vein thickness and reducing the generation of intermetallic compounds and brittle materials, so that a better connection interface can be formed between the solder layer and the electrode terminal and the conductive member, thereby improving the connection effect between the electrode terminal and the conductive member and reducing the probability of cracking and failure of the weld between the electrode terminal and the conductive member. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0044] Figure 1 A schematic structural diagram of a pole assembly provided in an embodiment of the present application;

[0045] Figure 2 Cross-sectional view of the pole assembly provided in the embodiment of the present application Figure 1 ;

[0046] Figure 3 A schematic structural diagram of an electrode terminal in a pole assembly provided in an embodiment of the present application;

[0047] Figure 4 Cross-sectional view of the pole assembly provided in the embodiment of the present application Figure 2 ;

[0048] Figure 5 An exploded view of the cover structure provided in an embodiment of the present application;

[0049] Figure 6 A cross-sectional view of the cover structure provided in an embodiment of the present application.

[0050] Reference numerals:

[0051] 100-pole assembly, 110-electrode terminal, 111-first connecting section, 112-second connecting section, 113-third connecting section, 114-ventilation hole, 115-groove, 116-gap one, 117-gap two, 118-flanged portion, 120-conductive member, 121-first connecting hole, 130-solder layer, 200-main body, 210-lead-out piece, 211-second connecting hole, 220-insulating gasket, 221-first limiting groove, 230-cover plate body, 231-second limiting groove, 232-third connecting hole, 240-sealing assembly, 250-top spacer.

[0052] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0053] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0054] The battery generally includes a cover structure and a shell body. The cover structure is installed on the shell body, and a pole assembly is provided on the cover structure.

[0055] As mentioned in the background technology, the weld between the pole and the pressure plate is more prone to cracking and failure during use. The main reason for this problem is that the pole and the pressure plate are made of different metal materials, and there is a large difference in physical properties between the two, resulting in fewer effective welds formed when the two are welded.

[0056] Specifically, common pole assemblies usually include copper poles, aluminum pressure plates and copper pressure plates. Copper poles generally include a column body and a base plate connected to one end of the column body. The aluminum pressure plate and the copper pressure plate are both mounted outside the column body, and the aluminum pressure plate is located between the copper pressure plate and the base plate. During welding, a welding molten pool is formed between the column body, the aluminum pressure plate and the copper pressure plate, connecting the column body, the aluminum pressure plate and the copper pressure plate.

[0057] The column and the aluminum pressure plate are riveted and then melt-welded. There are large differences in physical properties between aluminum (Al) and copper (Cu). The melting point of industrial pure Al is 660°C, and the melting point of industrial pure Cu is 1083°C. Al and Cu are infinitely miscible in liquid, but have limited solubility in solid.

[0058] The linear expansion coefficients of Al and Cu differ by more than 40%, a huge difference that leads to different thermal deformations of Al and Cu during thermal shock. When using traditional fusion welding to weld copper poles and aluminum blocks, it is impossible to overcome the large differences in the physical and chemical properties of Al and Cu, the easy oxidation of the joints, and the easy formation of brittle intermetallic compounds and pores in the brazing seam area. As a result, the fusion welding welds are prone to cracking and failure under actual working conditions, which increases the mechanical impedance of the cover structure used to assemble the pole assembly, and the cover is prone to heating, affecting the performance of the battery.

[0059] The pole assembly provided in the present application forms a first gap between the electrode terminal and the conductive part, and accommodates a suitable solder in the first gap, so that the solder layer formed after the solder is melted can adhere to and infiltrate the surface of the electrode terminal and the conductive part well to form a high-quality weld. Compared with traditional fusion welding, it can reduce the generation of intermetallic compounds and brittle substances, thereby reducing the probability of weld cracking and failure.

[0060] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0061] In some embodiments, see Figure 1 and Figure 2 As shown, the electrode assembly 100 includes an electrode terminal 110 , a conductive member 120 and a solder layer 130 .

[0062] The conductive part 120 is provided with a first connection hole 121 that passes through the conductive part 120 along the first direction, wherein the conductive part 120 can be directly an elliptical or circular structure similar to an arc rectangle, with the first connection hole 121 formed in the middle, or the conductive part 120 can also include a conductor and a connection component, the connection component is fixed on the conductive part, and the first connection hole 121 is defined on the connection component. Of course, the connection component and the conductive part are both made of conductive materials. The conductive part 120 is split into the conductive part and the connection component. When the structure of the conductive part is more complex, it can be processed separately to reduce the processing difficulty.

[0063] The electrode terminal 110 is used to electrically connect to the battery core, and one end is inserted into the first connection hole 121. When the electrode terminal 110 is inserted into the first connection hole 121, there is a first gap between the conductive member 120 and the electrode terminal 110. The solder layer 130 is located in the first gap, and the solder layer 130 is connected to the conductive member 120 and the electrode terminal 110.

[0064] The electrode terminal 110 and the conductive member 120 are both made of conductive metal materials, such as copper, aluminum, gold, silver, or alloys, but the materials used for the two are generally different.

[0065] Exemplarily, the electrode terminal 110 is a copper pole, and the conductive member 120 is an aluminum press plate, or the electrode terminal 110 is an aluminum pole, and the conductive member 120 is a copper press plate.

[0066] After setting the first gap, it is only necessary to select a solder with a suitable melting point and pre-place an appropriate amount of solder according to the size of the first gap. Then, heat and melt it to form a high-quality solder layer 130 that is well adhered to and infiltrated on the surface of the electrode terminal 110 and the first connection hole 121. Compared with direct welding of the electrode terminal 110 and the conductive member 120, this can reduce the generation of intermetallic compounds and brittle substances, improve the stability of the connection between the two, and reduce the probability of cracking and failure of the weld between the electrode terminal 110 and the conductive member 120 during use, thereby improving the stability of battery use.

[0067] In addition, the formation of the first gap includes but is not limited to the following methods:

[0068] Exemplarily, when the electrode terminal 110 is inserted into the first connection hole 121 , the end portion remains outside the conductive member 120 , and a first gap is formed between the end portion of the electrode terminal 110 and the top surface of the conductive member 120 in the first direction.

[0069] Exemplarily, when the electrode terminal 110 is inserted into the first connection hole 121 , the bottom of the electrode terminal 110 along the first direction extends out of the first connection hole 121 and forms a first gap with the bottom surface of the conductive member 120 along the first direction.

[0070] Exemplarily, after the electrode terminal 110 is inserted into the first connection hole 121 , a gap is formed between a portion of the outer wall of the electrode terminal 110 and a portion of the inner wall of the first connection hole.

[0071] For example, an annular groove can be provided on the inner wall of the first connection hole 121, a predetermined amount of solder is pre-placed in the annular groove, and then the electrode terminal 110 is inserted into the first connection hole 121, that is, the annular groove can be closed to form a first gap, and the solder is also located in the first gap. As long as the solder is heated to melt, a solder layer 130 connecting the inner wall of the first connection hole 121 and the electrode terminal 110 can be formed.

[0072] It should be noted that the electrode terminal 110 can be partially inserted into the first connection hole 121, or the electrode terminal 110 can be completely located in the first connection hole 121. At this time, the battery's tab can enter the first connection hole 121 to be electrically connected to the electrode terminal 120, or the battery's tab can be connected to the electrical terminal 110 at one end of the first connection hole 121; the electrode terminal 110 can also pass through the first connection hole 121. At this time, the tab and the electrode terminal 110 extend to the end outside the first connection hole 121 and are electrically connected. The specific connection method can be determined according to actual conditions.

[0073] For example, see Figure 2 and Figure 3 As shown, the first connecting hole 121 includes a first hole segment and a second hole segment arranged in sequence along the first direction, the projection of the first hole segment in the first direction is at least partially located outside the second hole segment, and a first connecting surface is formed between the first hole segment and the second hole segment, and the first connecting surface is perpendicular to the first direction or forms a certain angle with the first direction.

[0074] Exemplarily, the first hole segment and the second hole segment are both waist-shaped holes, and the first hole segment and the second hole segment are coaxially arranged, and the diameter of the first hole segment is larger than the diameter of the second hole segment, forming a first connecting surface perpendicular to the first direction at the connection between the two, and the first connecting surface is annular.

[0075] It should be noted that the first hole segment and the second hole segment may also be in other shapes, which are not limited in this embodiment.

[0076] The electrode terminal 110 has a second connecting surface parallel to the first connecting surface. The orthographic projection of the second connecting surface in the first direction at least partially overlaps with the second connecting surface, and the first connecting surface and the second connecting surface are spaced apart in the first direction to form a gap 116, which is the first gap.

[0077] During processing, the amount of solder required to form the solder layer 130 can be determined by determining the dimensions of the first and second connection surfaces and the size of the gap 116 . Before inserting the electrode terminal 110 into the first connection hole 121 , the solder can be placed on the second connection surface.

[0078] In some embodiments, the electrode terminal 110 includes a first connecting segment 111 and a second connecting segment 112 connected to each other, and the projection of the first connecting segment 111 in the first direction is at least partially located outside the second connecting segment 112 to form a second connecting surface at the connection between the first connecting segment 111 and the second connecting segment 112.

[0079] Exemplarily, the electrode terminal 110 is generally a structure similar to an arc rectangle, with the first connecting segment 111 and the second connecting segment 112 coaxially arranged, and the diameter of the first connecting segment 111 is larger than the diameter of the second connecting segment 112, so that a first connecting surface protruding from the second connecting segment 112 can be formed at the transition between the two. The first connecting segment 111 passes through the first hole segment with a larger inner diameter of the first connecting hole 121, and then enters the second hole segment. At this time, the first connecting segment 111 partially or completely enters the first hole segment, and a gap 116 is formed between the first connecting surface and the second connecting surface.

[0080] Furthermore, the first connecting section 111 is at least partially inserted into the first hole section, and a gap 2 117 can be provided between the first connecting section 111 and the hole wall of the first hole section. The bottom of the gap 2 117 is connected to the top of the gap 1 116, and the gap 1 116 and the gap 2 117 together constitute the first gap.

[0081] like Figure 2 As shown, the first gap as a whole can be an annular gap arranged around the outside of the electrode terminal 110, and the longitudinal section of the first gap is an L-shaped shape. This shape can effectively increase the contact area between the solder layer 130 and the first connection hole 121 and the surface of the electrode terminal 110, improve the connection strength, and also have a better sealing effect.

[0082] It should be noted that the shape of the first gap can be adjusted according to actual conditions and is not necessarily the shape in the above example. The electrode terminal 110 is not necessarily in the shape of an arc rectangle and can be other shapes.

[0083] In some embodiments, the electrode terminal 110 further includes a third connecting segment 113, which is connected to an end of the second connecting segment 112 facing away from the first connecting segment 111. The projection of the third connecting segment 113 in the first direction is at least partially located outside the second connecting segment 112, and the connection between the third connecting segment 113 and the second connecting segment 112 forms a third connecting surface.

[0084] Exemplarily, the first connecting segment 111 , the second connecting segment 112 and the third connecting segment 113 are all shaped like arc rectangles and are coaxially arranged. In this case, the outer diameters of the first connecting segment 111 , the second connecting segment 112 and the third connecting segment 113 decrease successively.

[0085] A fourth connection surface abutting against the third connection surface is provided on the inner wall of the first connection hole 121 , and at least a portion of the inner wall of the second connection section 112 contacts the inner wall of the first connection hole 121 .

[0086] Specifically, the first connecting hole 121 also includes a third hole segment, which is located at the end of the second hole segment away from the first hole segment, and the positive projection of the second hole segment in the first direction is at least partially located outside the third hole segment to form a fourth connecting surface between the second hole segment and the third hole segment, and the fourth connecting surface is parallel to and abuts the third connecting surface.

[0087] Taking the first hole segment, the second hole segment and the third hole segment as an example, all of which are waist-shaped holes and are coaxially arranged, the inner diameter of the first hole segment is the largest, the inner diameter of the second hole segment is slightly smaller, and the inner diameter of the third hole segment is the smallest. The connection between the first hole segment and the second hole segment forms a second connection surface, and the connection between the second hole segment and the third hole segment forms a fourth connection surface. The first connection segment 111 is inserted into the first hole segment, the second connection segment 112 is at least partially inserted into the second hole segment, and the third connection segment 113 is partially located in the third hole segment, and can also pass through the hole segment and partially extend to the third hole segment. In addition, the third connecting surface can be abutted against the fourth connecting surface to limit the first connecting segment 111 and the second connecting segment 112, thereby ensuring that the gap 116 between the first connecting surface and the second connecting surface is fixed, so that the amount of solder used in the solder layer 130 can be more accurately controlled, so that the thickness of the solder layer 130 formed after the solder is melted is uniform, avoiding the uneven welding veins caused by uneven melting of the solder, resulting in poor flatness, thereby effectively improving the connection strength between the electrode terminal 110 and the conductive member 120.

[0088] Furthermore, a vent hole 114 communicating with the first gap may be provided on the electrode terminal 110 .

[0089] During the process of heating and melting the solder to form the solder layer 130, effective ventilation can be achieved through the ventilation holes 114 to avoid defects such as pores in the solder layer 130. At the same time, after welding, the appearance of the weld vein can also be observed through the ventilation holes 114 to eliminate defective products in time.

[0090] Specifically, the air hole 114 is arranged on the first connecting section 111, one end of the air hole 114 is located on the first connecting surface, and the other end extends to the end of the first connecting section 111 away from the second connecting section 112. In order to shorten the gas discharge stroke and facilitate observation, the air hole 114 can pass through the first connecting section along the first direction and be connected to the first gap. When in use, the gas in the gap 116 can enter the air hole 114 through the inlet on the first connecting surface, and leave the pole assembly 100 from the outlet at the top of the first connecting section 114 after passing through the air hole 114.

[0091] Among them, the air hole 114 can be set as a countersunk hole or a hole of other shapes, as long as it is breathable and convenient for observing the appearance of the weld vein. In addition, the number of the air holes 114 can also be determined according to actual conditions, and can be one or more. This embodiment does not limit it here.

[0092] In some embodiments, see Figure 4 As shown, the first gap is an annular gap arranged around the outside of the electrode terminal 110, and the width S1 of the first gap in the radial direction of the electrode terminal 110 can be greater than or equal to 0.5 mm, that is, in the second direction perpendicular to the first direction, the distance from the inner edge to the outer edge of the first gap is less than or equal to 0.5 mm, so that the solder layer has a certain width, thereby ensuring a certain contact area between the solder layer and the inner wall of the first connecting hole 121 and the outer surface of the electrode terminal, so that the connection strength meets the requirements.

[0093] Furthermore, in the second direction, the ratio of the distance S1 from the inner edge to the outer edge of the first gap to the size S2 of the conductive part 120 is greater than or equal to 0.05, that is, S1 / S2≥0.05, wherein S2 is the length of the conductive part 120 in the second direction. Taking the structure of the conductive part 120 as an arc rectangle as an example, the two sides of the conductive part 120 extending along the second direction are straight sides, and the ends are arc-shaped sides. Its maximum length in the second direction is S2. The width of the first gap can be adaptively adjusted according to the size of the conductive part 120, so that the width of the first gap can be increased as much as possible to improve the connection strength while ensuring that the strength of the conductive part 120 meets the requirements.

[0094] It should be noted that the second direction here refers to the direction in which the length of the conductive element 120 is the largest.

[0095] For common batteries, S2 is generally less than or equal to 20 mm, so the width of the first gap can be adjusted accordingly within this range.

[0096] The present application also provides a cover plate structure, see Figure 5 and Figure 6 As shown, it includes a main body component 200 and the pole assembly 100 in the above embodiment, and the pole assembly 100 is connected to the main body component 200.

[0097] The cover structure is mainly connected to the battery casing, sealing the casing and protecting the components inside the casing.

[0098] After the pole assembly 100 is connected to the main body 200, during the operation of the battery, the connection between the electrode terminal 110 and the conductive member 120 is relatively stable and not prone to cracking and failure, thereby reducing the probability of heating of the cover plate due to failure of the connection between the electrode terminal 110 and the conductive member 120, which helps to improve the performance of the battery.

[0099] In some embodiments, the main body 200 includes a lead-out tab 210, which is used to connect the electrodes inside the battery. The lead-out tab 210 can increase the connection area between the electrode terminal 110 and the internal tab of the battery, thereby increasing the current-carrying area and improving the battery charging performance.

[0100] A second connection hole 211 is provided on the lead-out piece 210. The second connection hole 211 is a second stepped hole, wherein a groove 115 is provided at the end of the electrode terminal 110 facing away from the conductive member 120. When the electrode terminal 110 is inserted into the second connection hole 211, the end of the electrode terminal 110 is deformed by impacting the groove 115, forming a flange portion 118. The flange portion 118 abuts against the fifth connection surface of the second connection hole 211.

[0101] Specifically, the second connection hole 211 includes a fourth hole segment and a fifth hole segment arranged sequentially along the first direction. The segment closest to the conductive member 120 is the fourth hole segment. The inner diameter of the fourth hole segment is smaller than the inner diameter of the fifth hole segment, that is, the orthographic projection of the fifth hole segment in the first direction is at least partially located outside the fourth hole segment. A fifth connection surface is formed between the fifth and fourth hole segments. The end of the electrode terminal 110 can directly pass through the fourth hole segment and extend into the fifth hole segment. At this time, an auxiliary component such as a punch can be inserted into the groove 115 to impact the electrode terminal 110. The punching deformation causes the end of the electrode terminal 110 to abut against the fifth connection surface, achieving a riveted connection between the lead tab 210 and the electrode terminal 110, increasing the contact area between the lead tab 210 and the electrode terminal 110, and improving the connection strength. In addition, laser brazing can be performed after riveting to further enhance the connection strength between the two.

[0102] The shape of the punch is adapted to the shape of the groove 115, so that during the impact process, the force can be evenly applied to each part of the groove 115. In addition, by controlling the size of the groove 115, the success rate of riveting the electrode terminal 110 and the lead tab 210 can also be effectively controlled.

[0103] It should be noted that the groove 115 can be set to a circular, elliptical, polygonal or circular runway-like shape, etc., which can be determined according to actual conditions and is not limited in this embodiment.

[0104] In some embodiments, the main body component 200 further includes an insulating gasket 220 , a cover body 230 , and a sealing assembly 240 , which are sequentially sleeved on the outside of the electrode terminal 110 from the conductive member 120 to the lead-out piece 210 .

[0105] The insulating gasket 220 is provided with a first limiting groove 221, and the conductive member 120 is at least partially engaged with the first limiting groove 221. The cover body 230 is provided with a third connection hole 232 and a second limiting groove 231. The insulating gasket 220 is partially located in the first limiting groove 221 and is limited by the first limiting groove 221. The conductive member 120 and the cover body 230 are separated by the insulating member. The electrode terminal 110 passes through the third connection hole 232, and a second gap is defined between the electrode terminal 110 and the hole wall of the third connection hole 232. The sealing assembly 240 seals the gap between the cover body 230 and the lead-out tab 210 and separates the cover body 230 from the lead-out tab 210. The sealing assembly 240 also partially extends into the second gap, separating the cover body 230 and the electrode terminal 110. The sealing assembly 240 can be an annular structure made of an insulating material commonly used in batteries and capable of performing a sealing function. This embodiment is not limited thereto.

[0106] Specifically, the first limiting groove 221 is located on the side of the insulating gasket 220 facing the conductive part 120, so that the end of the conductive part 120 can be inserted into the first limiting groove 221, and the second limiting groove 231 is located on the side of the cover body 230 close to the conductive part 120, so that the insulating gasket 220 can be inserted. In order to limit the position of the insulating gasket 220, a step surface can be set on the outside of the conductive part 120. When the insulating gasket 220 is sleeved on the outside of the electrode terminal 110, the top of the insulating gasket 220 directly abuts against the step surface for limitation, and the bottom contacts the second limiting groove 231, thereby limiting the position of the insulating gasket 220 through the cover body 230 and the conductive part 120.

[0107] In addition, the main body 200 may also include a top spacer 250, which is used to insulate the cover body 230 and the lead-out piece 210, reduce the contact between the cover body 230 and the lead-out piece 210, avoid the occurrence of battery short circuit, and improve the safety of battery use.

[0108] Specifically, the top spacer 250 is located between the cover body 230 and the lead-out piece 210. A through hole is provided on the cover body for the electrode terminal 110 to pass through. The lead-out piece 210 has a connecting portion, which extends into the through hole and is located between the electrode terminal 110 and the top spacer 250. A groove for embedding the sealing component 240 is also provided on the top spacer 250. The groove is connected to the through hole, and the connecting portion abuts against the sealing component 240, so that the sealing component can seal the gap between the cover body 230 and the connecting portion and separate the two. The top spacer 250 contacts the cover body 230 and the remaining part of the lead-out piece, separating the two and enhancing the insulation and support effects.

[0109] An embodiment of the present application further provides a method for preparing a cover plate structure, comprising:

[0110] Providing a main body component 200;

[0111] A pole assembly 100 is provided, and the pole assembly 100 and the main body component 200 are connected.

[0112] Specifically, the insulating gasket 220, the cover plate body 230, the sealing assembly 240, the top spacer 250 and the lead-out piece 210 can be sequentially mounted on the electrode terminal 110, and then the lead-out piece 210 and the electrode terminal 110 can be riveted or welded, or riveted and then welded, to obtain the cover plate structure.

[0113] The present application also provides a method for preparing the pole assembly in the above embodiment, comprising:

[0114] The electrode terminal 110 is inserted into the first connection hole 121, forming a first gap between the conductive member and the electrode terminal 110, and a predetermined amount of solder is placed in the first gap. The solder can be of any shape, or can be pre-prepared into a shape that matches the shape of the first gap, so that the solder can be quickly and evenly filled into the first gap after melting. For example, when the cross-section of the first gap is L-shaped, the solder can be made into a solder ring, the upper end of which matches the shape of the gap 117, and the lower end matches the shape of the gap 116.

[0115] The electrode terminal 110 and the conductive member 120 are heated to a preset temperature at which the solder can melt, so that the solder melts and fills the first gap to form a solder layer 130, thereby obtaining the pole assembly 100. The heating can be a common heating method such as solid high-frequency heating or furnace temperature heating, as long as the preset temperature can be reached. This embodiment does not limit this.

[0116] The preset temperature is generally the melting point of the solder. It should be noted that the melting point of the solder is lower than the melting points of the electrode terminal 110 and the conductive member 120 .

[0117] Taking the electrode terminal 110 as a copper pole and the conductive part 120 as an aluminum block as an example, the melting point of the solder needs to be less than 660°C, that is, less than the melting point of aluminum, so that the electrode terminal 110 and the conductive part 120 are not affected when the solder melts. Therefore, the solder can be conventional solder, as long as the melting point meets the requirements and can stably connect the electrode terminal and the conductive part, such as aluminum-based solder, zinc-aluminum alloy solder, silver-based solder, cadmium-silver solder, etc.

[0118] Of course, when both the electrode terminal 110 and the conductive member 120 are made of materials with relatively high melting points, the melting point of the solder may be increased accordingly, that is, it may be greater than or equal to 660° C., which is not limited in this embodiment.

[0119] It should be noted that when preparing the cover plate structure, a pole assembly 100 is provided, or the solder is simply placed in the first gap without heating. After the pole assembly 100 and the main body component 200 are assembled, the solder is heated to melt to form a solder layer 130. At this time, the melting points of the insulating gasket 220, the sealing assembly 240, etc. are required to be greater than the melting point of the solder. For example, the insulating gasket 220 can be made of ceramic material. The embodiment of the present application also provides a battery, including a shell body, a pole core, and the pole assembly 100 or the cover plate structure in the above embodiment. Of course, the cover plate structure can also be a cover plate structure prepared by the preparation method of the cover plate structure in the above embodiment, and the pole assembly 100 can also be a pole assembly 100 prepared by the preparation method of the pole assembly above. The pole assembly 100 is electrically connected to the pole core. The pole assembly 100 is arranged on the cover plate structure, and the pole core is located in the shell body. The cover plate structure is used to close the shell body.

[0120] An embodiment of the present application further provides a battery device, comprising a housing and the battery in the above embodiment, wherein the battery is disposed in the housing.

[0121] An embodiment of the present application also embodies an electrical device, including the battery or battery device in the above embodiment, where the battery or battery device is used to supply power to electrical components in the electrical device.

[0122] The power-consuming device in the embodiments of the present application may be a vehicle. For example, the vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Accordingly, the power-consuming component may be the vehicle's drive mechanism or the vehicle's control system.

[0123] In addition, the electrical device can also be other equipment that needs to be powered by batteries or battery devices, such as mobile phones, portable devices, laptops, electric toys, electric tools, ships and spacecraft, etc., among which spacecraft can include airplanes, rockets, space shuttles or spacecraft.

[0124] Since the electrical device in this embodiment includes the battery or battery device described in any of the above embodiments, the structure and beneficial effects of the electrical device including the battery or battery device will not be further described in this embodiment.

[0125] Finally, it should be noted that those skilled in the art will readily identify other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The present invention is not limited to the precise structure described above and illustrated in the accompanying drawings, and various modifications and variations may be made without departing from the scope thereof. The scope of the present invention is limited solely by the appended claims.

Claims

1. A pole assembly (100), characterized in that: include: Electrode terminal (110); A conductive member (120), wherein the conductive member (120) is provided with a first connection hole (121) penetrating the conductive member (120) along a first direction, the electrode terminal (110) is at least partially disposed in the first connection hole (121), and a first gap is provided between the conductive member (120) and the electrode terminal (110); A solder layer (130) is located in the first gap, and the solder layer (130) is connected to the conductive member (120) and the electrode terminal (110).

2. The pole assembly (100) according to claim 1, characterized in that The first gap is formed between at least a portion of the inner wall of the first connection hole (121) and at least a portion of the outer wall of the electrode terminal (110).

3. The pole assembly (100) according to claim 2, characterized in that The first connecting hole (121) comprises a first hole segment and a second hole segment connected in sequence along the first direction, an orthographic projection of the first hole segment in the first direction is at least partially located outside the second hole segment, and a first connecting surface is formed between the first hole segment and the second hole segment; The electrode terminal (110) has a second connection surface corresponding to the first connection surface, the orthographic projection of the second connection surface in the first direction at least partially overlaps with the first connection surface, and the first connection surface and the second connection surface are spaced apart in the first direction to form the first gap.

4. The pole assembly (100) according to claim 3, characterized in that The electrode terminal (110) comprises a first connecting segment (111) and a second connecting segment (112) connected to each other along the first direction, wherein an orthographic projection of the first connecting segment (111) in the first direction is at least partially located outside the second connecting segment (112), so as to form a second connecting surface between the first connecting segment (111) and the second connecting segment (112); The second connecting section (112) is at least partially located in the second hole section, and the first connecting section (111) is at least partially located in the first hole section.

5. The pole assembly (100) according to claim 4, characterized in that The outer wall of the first connecting section (111) and the inner wall of the first hole section, as well as the first connecting surface and the second connecting surface are spaced apart to form the first gap.

6. The pole assembly (100) according to claim 4, characterized in that The electrode terminal (110) further comprises a third connecting segment (113), the third connecting segment (113) being connected to an end of the second connecting segment (112) facing away from the first connecting segment (111), and the orthographic projection of the second connecting segment (112) in the first direction being at least partially located outside the third connecting segment (113), so as to form a third connecting surface between the third connecting segment (113) and the second connecting segment (112); The first connecting hole further includes a third hole segment, the third hole segment being located at an end of the second hole segment facing away from the first hole segment, and the orthographic projection of the second hole segment in the first direction being at least partially located outside the third hole segment, so as to form a fourth connecting surface between the second hole segment and the third hole segment, and the fourth connecting surface being connected to the third connecting surface.

7. The pole assembly (100) according to claim 4, characterized in that The first connecting section (111) is provided with an air vent (114), and the air vent (114) passes through the first connecting section (111) along the first direction and is communicated with the first gap.

8. The pole assembly (100) according to any one of claims 1 to 7, characterized in that: The first gap is an annular gap arranged around the outside of the electrode terminal (110), and in the second direction, the distance from the inner edge to the outer edge of the first gap is greater than or equal to 0.5 mm, and the second direction is perpendicular to the first direction.

9. The pole assembly (100) according to claim 8, characterized in that In the second direction, the ratio of the distance from the inner edge to the outer edge of the first gap to the size of the conductive member (120) is greater than or equal to 0.

05.

10. The pole assembly (100) according to any one of claims 1 to 7, characterized in that: One of the electrode terminal (110) and the conductive member (120) is made of copper, and the other is made of aluminum.

11. The pole assembly (100) according to any one of claims 1 to 7, characterized in that: The conductive member (120) comprises a conductive body and a connection assembly for conductive connection, and the connection assembly defines the first connection hole (121).

12. A method for preparing a pole assembly, applied to the pole assembly (100) according to any one of claims 1 to 11, characterized in that: include: Providing a conductive member (120); Providing an electrode terminal (110), so that the electrode terminal (110) is at least partially inserted into the first connection hole (121), and a first gap is formed between the conductive member (120) and the electrode terminal (110); placing a preset amount of solder in the first gap; The solder is heated to a preset temperature, so that the solder is melted and filled in the first gap to form a solder layer (130), thereby obtaining the pole assembly (100).

13. The method for preparing a pole assembly according to claim 12, characterized in that: The melting point of the solder is lower than the melting points of the electrode terminal (110) and the conductive member (120).

14. The method for preparing a pole assembly according to claim 13, characterized in that: One of the electrode terminal (110) and the conductive member (120) is made of copper, and the other is made of aluminum, and / or the melting point of the solder is less than 660°C.

15. A cover plate structure, characterized in that: The invention comprises a main body component (200), and a pole assembly (100) prepared by the preparation method of the pole assembly (100) according to any one of claims 1 to 11 or the pole assembly according to any one of claims 12 to 14, wherein the pole assembly (100) is connected to the main body component (200).

16. The cover plate structure according to claim 15, characterized in that: The main body component (200) comprises a lead-out piece (210), a second connection hole (211) is provided on the lead-out piece (210), the second connection hole (211) comprises a fourth hole segment and a fifth hole segment sequentially arranged along a first direction, an orthographic projection of the fifth hole segment in the first direction is at least partially located outside the fourth hole segment, and a fifth connection surface is formed between the fifth hole segment and the fourth hole segment; Wherein, a flange portion (118) is provided at one end of the electrode terminal (110) facing away from the conductive member (120), and the flange portion (118) abuts against the fifth connecting surface.

17. The cover plate structure according to claim 16, characterized in that: The main body component (200) further includes: An insulating gasket (220), wherein a first limiting groove (221) is provided on the insulating gasket (220), and the conductive member (120) is at least partially limitedly engaged with the first limiting groove (221); A cover plate body (230), wherein a third connection hole (232) and a second limiting groove (231) are provided on the cover plate body (230), the electrode terminal (110) passes through the third connection hole (232), and a second gap is provided between the electrode terminal (110) and the hole wall of the third connection hole (232), and the insulating gasket (220) is at least partially provided in the second limiting groove (231); A sealing component (240) is provided, wherein the sealing component (240) seals the gap between the cover plate body (230) and the lead-out piece (210), and a portion of the sealing component (240) extends into the second gap.

18. The cover plate structure according to claim 17, characterized in that: The main body component (200) further includes a top spacer (250) sleeved outside the electrode terminal (110), and the top spacer (250) is located between the cover plate body (230) and the lead-out piece (210) to separate the cover plate body (230) and the lead-out piece (210); The sealing component (240) is partially embedded in the top spacer (250), and the lead piece (210) partially passes through the gap between the top spacer (250) and the electrode terminal (110) and abuts against the sealing component (240).

19. A battery, characterized in that: The invention comprises a shell body and a pole core, and a pole assembly (100) prepared by the preparation method of the pole assembly according to any one of claims 1 to 11 or any one of claims 12 to 14, or a cover plate structure according to any one of claims 15 to 18, wherein the pole core is located in the shell body, and the pole assembly (100) is electrically connected to the pole core.

20. A battery device, characterized in that: The invention comprises a housing and the battery according to claim 19, wherein the battery is arranged in the housing.

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

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