Battery cell and battery pack

Abstract

The utility model relates to new energy battery technical field discloses a battery monomer and battery package have first direction, include: apron subassembly, including top cover piece and pole, top cover piece is equipped with assembly hole, pole is worn in assembly hole, and pole has first gap;Supporting piece is equipped with second gap, and second gap is opposite first gap along first direction setting;Electrode subassembly includes main part and tab, and tab is worn in first gap and second gap along first direction, and tab is sealed with supporting piece cooperation, and supporting piece is equipped with pole one side near main part;Connecting piece, part is worn in first gap and is connected with supporting piece. Supporting piece makes the first gap of pole one side near main part be relatively sealed structure, avoids the molten conductive material and main part contact and damages electrode subassembly, and the connecting piece, tab, pole between form filling seal welding, do not have the request to the space of first gap, are favorable to guarantee the welding quality.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a battery cell and battery pack. Background Technology

[0002] With the development of new energy vehicles, battery cells play an irreplaceable role as a power source and have been widely used and developed. As a result, people have increasingly higher requirements for the reliability and safety of battery cells.

[0003] A typical battery cell consists of a cover plate, electrode assembly, and casing. The cover plate has terminals, and an adapter plate connects to the bottom of each terminal. The adapter plate is electrically connected to the tabs of the electrode assembly. The adapter plate, acting as a connector between the terminals and tabs, requires welding to both terminals separately during installation, necessitating multiple welding operations. To simplify the process and reduce costs, some battery cells eliminate the connector plate, instead using through holes in the terminals. The tabs pass through these holes, fold over, and are directly welded to the terminals for fixation.

[0004] The small area of ​​the tabs makes welding difficult and inconsistent welding difficult when the tabs are folded over and welded to the electrode post. Utility Model Content

[0005] The purpose of this utility model is to provide a battery cell to solve the problems of limited operating space and poor consistency when welding the tabs and terminals in the prior art; this utility model also provides a battery pack using the battery cell.

[0006] To achieve the above objectives, this utility model provides a battery cell having a first orientation, comprising:

[0007] A cover plate assembly includes a top cover plate and an electrode post. The top cover plate has an assembly hole that extends through the top cover plate along a first direction. The electrode post passes through the assembly hole and has a first gap that extends through the electrode post along the first direction.

[0008] A support member is fixedly connected to the pole post, and the support member is provided with a second gap, which is arranged opposite to the first gap along the first direction.

[0009] An electrode assembly includes a main body and an electrode tab electrically connected to the main body. The electrode tab is disposed along a first direction through a first gap and a second gap. The electrode tab is sealed to a support member. The support member is disposed on the side of the electrode post close to the main body along the first direction.

[0010] A connector is partially inserted through the first gap and connected to the support member, and the connector seals the electrode lug and the electrode post respectively.

[0011] In some embodiments, the melting point of the connector is T1, the melting point of the tab is T2, and the melting point of the post is T3, satisfying that T1 < T2 and T1 < T3.

[0012] In some embodiments, the pole post is further provided with a first sink groove on the side away from the main body along the first direction, and the first sink groove is in communication with the first gap.

[0013] The connector includes a first connecting part and a second connecting part connected to each other. The first connecting part is disposed in the first gap and seals the electrode lug and the electrode post. The second connecting part is disposed in the first sink.

[0014] In some embodiments, the battery cell further includes a second direction, the first direction and the second direction are perpendicular to each other, and the electrode post is provided with a blind hole on the side away from the main body along the first direction. The blind hole and the first gap are spaced apart along the second direction, and the blind hole communicates with the first sink.

[0015] The connector further includes a boss connected to the second connecting portion. The boss is located on the side of the second connecting portion facing the support member along the first direction, and the boss passes through the blind hole.

[0016] In some embodiments, along the first direction, the diameter of the mounting hole gradually decreases in the direction away from the main body, the mounting hole has an inclined inner wall, the outer periphery of the pole post has an outer wall surface, the outer wall surface is inclined relative to the first direction, the pole post has a bottom wall facing the main body along the first direction, the inner wall and the bottom wall have a first angle, the outer wall surface and the bottom wall have a second angle, and the first angle and the second angle are equal;

[0017] The battery cell also includes a sealing element, which is arranged around the terminal post and is entirely located within the assembly hole. The sealing element is respectively sealed to the outer wall surface and the assembly hole.

[0018] In some embodiments, the cover plate assembly further includes a first insulating member connected to the top cover plate, the first insulating member being disposed on one side of the top cover plate facing the main body portion along the first direction, the first insulating member being partially disposed between the outer wall surface and the inner hole wall, and the first insulating member supporting the sealing member.

[0019] In some embodiments, the first insulating member includes a first insulating portion and a second insulating portion connected to each other. The first insulating portion is disposed on the side of the top cover sheet near the main body portion, and the second insulating portion protrudes from the side of the first insulating portion away from the main body portion. The second insulating portion is inclined relative to the first direction. The second insulating portion is at least partially pressed between the outer wall surface and the inner hole wall, and the second insulating portion supports the sealing member.

[0020] In some embodiments, the pole post includes a first conductive portion and a second conductive portion connected together, the first gap penetrates the first conductive portion along the first direction, the first conductive portion is disposed on the side of the second conductive portion facing the main body along the first direction, the pole post has a composite interface formed by the connection of the first conductive portion and the second conductive portion, and the sealing member has a bottom end near the main body, the bottom end being located on the side of the composite interface near the main body.

[0021] In some embodiments, a third sink is provided on the side of the second conductive portion away from the electrode assembly, the third sink has a bottom, and a second sink is provided on the side of the bottom away from the electrode assembly. The second sink communicates with the first gap, and the bottom completely covers the first conductive portion along the first direction. The connector portion is provided in the second sink.

[0022] In some embodiments, the electrode post further includes a flanged portion connected to the second conductive portion, the flanged portion being disposed on the side of the electrode post away from the main body portion along the first direction, and the flanged portion being disposed around the second conductive portion;

[0023] The cover plate assembly further includes a second insulating member, which is disposed around the pole post and insulatingly isolates the pole post from the top cover plate. The second insulating member is partially disposed between the outer wall surface and the inner hole wall.

[0024] In some embodiments, the second insulating member includes a third insulating portion and a fourth insulating portion connected together. The third insulating portion is at least partially pressed between the flange and the top cover plate along the first direction. The fourth insulating portion protrudes from the third insulating portion on the side near the main body portion. The fourth insulating portion is inclined relative to the first direction. The fourth insulating portion is at least partially disposed between the outer wall surface and the inner hole wall, and the fourth insulating portion abuts against the sealing member.

[0025] In some embodiments, the second insulating member further includes a fifth insulating portion connected to the third insulating portion, the fifth insulating portion being disposed around the flange portion and the fifth insulating portion being sealed to the flange portion.

[0026] In some embodiments, the top cover further includes an end cap and a beveled edge connected together. The beveled edge protrudes from the side of the end cap away from the main body. The beveled edge is inclined relative to the first direction. The beveled edge surrounds the pole post. The end cap and the beveled edge enclose the mounting hole. The third insulating portion is at least partially disposed between the beveled edge and the flanged portion. The fourth insulating portion is sandwiched between the beveled edge and the outer wall surface.

[0027] This utility model also provides a battery pack, including the battery cells described in any of the above technical solutions.

[0028] Compared with the prior art, the advantages of this embodiment of the battery cell and battery pack are as follows: A support member is provided on the side of the electrode post near the main body. The support member is connected to the connector. The electrode tab is simultaneously inserted through the second gap of the support member and the first gap of the electrode post, and is sealed to the support member. The support member supports the electrode tab to prevent deformation. The connector is formed by solidifying molten conductive material. The support member makes the side of the first gap of the electrode post near the main body a relatively sealed structure, preventing the molten conductive material from contacting the main body and damaging the electrode assembly. The conductive material fills the first gap and then solidifies to form the connector, connecting the electrode tab to the electrode post and sealing the first gap. The connector seals and connects the electrode tab and the electrode post respectively. A potting weld is formed between the connector, the electrode tab, and the electrode post. There are no requirements for the space of the first gap, which reduces the difficulty of the welding operation and helps to ensure the welding quality. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a single battery cell of this utility model;

[0030] Figure 2 yes Figure 1 A schematic diagram of the structure of the support component for a single battery cell;

[0031] Figure 3 yes Figure 1 A schematic diagram of the structure of the connector of a battery cell;

[0032] Figure 4 yes Figure 1 A schematic diagram of the terminal structure of a single battery cell;

[0033] Figure 5 yes Figure 4 A cross-sectional view of the pole;

[0034] Figure 6 This is a cross-sectional view of the battery cell of this utility model;

[0035] Figure 7 yes Figure 6 An enlarged schematic diagram of the battery cell at point C;

[0036] Figure 8 yes Figure 6 An enlarged schematic diagram of cell A;

[0037] Figure 9 yes Figure 6 Enlarged schematic diagram of cell B;

[0038] Figure 10 This is a schematic diagram of another embodiment of the battery cell of this utility model;

[0039] Figure 11 This is a schematic diagram of another embodiment of the battery cell of this utility model.

[0040] In the figure, 1 is the cover plate assembly, 11 is the top cover plate, 111 is the assembly hole, 1111 is the inner hole wall, 112 is the end cap, 113 is the bevel, 12 is the pole post, 121 is the first gap, 122 is the first recess, 123 is the blind hole, 124 is the outer wall surface, 125 is the first conductive part, 126 is the second conductive part, 1261 is the third recess, 1262 is the bottom of the recess, 127 is the second recess, 128 is the flange, 129 is the composite interface, 120 is the first wall, and 13 is the first insulating component. 131. First insulating part; 132. Second insulating part; 14. Second insulating element; 141. Third insulating part; 142. Fourth insulating part; 143. Fifth insulating part; 2. Housing; 3. Support element; 31. Second gap; 4. Electrode assembly; 41. Main body; 42. Electrode tab; 5. Connector; 51. First connecting part; 52. Second connecting part; 53. Boss; 6. Seal; 61. Bottom end; 62. Inner side; 63. Outer side; Z: First direction; Y: Second direction. Detailed Implementation

[0041] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein 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 with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0042] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0043] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above" or "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below" or "below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or hierarchy, or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, the term "multiple" means two or more, unless otherwise explicitly defined.

[0045] In the description of this application, unless otherwise explicitly specified, the terms "installation," "connection," "attachment," etc., should be interpreted broadly. For example, they can refer to non-detachable connections (e.g., welding, riveting, etc.), detachable connections (e.g., snap-fit, screw-fit, plug-in, etc.), or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] In the description of this application, the term "and / or" can be understood to mean three possibilities. For example, A and / or B can represent: A alone; A and B simultaneously; or B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0047] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0048] A preferred embodiment of a battery cell of this utility model is as follows: Figures 1 to 11As shown, the battery cell includes a cover plate assembly 1, a support member 3, an electrode assembly 4, and a connector 5. The battery cell also has a first direction Z. In this embodiment, the first direction Z is the height direction of the battery cell.

[0049] like Figure 1 and Figure 4 As shown, the cover plate assembly 1 includes a top cover plate 11 and an electrode post 12. The top cover plate 11 is fixedly connected to the housing 2, and the top cover plate 11 and the housing 2 enclose a receiving cavity. The electrode assembly 4 is disposed in the receiving cavity, and the top cover plate 11 and the housing 2 provide protection for the electrode assembly 4. In this embodiment, the top cover plate 11 is rectangular, the housing 2 is cuboid, and the top cover plate 11 and the electrode post 12 are welded and fixed along the first direction Z.

[0050] The top cover plate 11 has a mounting hole 111 that extends through the top cover plate 11 along a first direction Z, and the electrode post 12 passes through the mounting hole 111. The electrode post 12 also has a first gap 121 that extends through the electrode post 12 along a first direction Z, and the first gap 121 is used to assemble the tab 42 of the electrode assembly 4.

[0051] like Figure 2 As shown, the support member 3 is fixedly connected to the electrode post 12, and the support member 3 is disposed on the side of the electrode post 12 facing the main body 41 of the electrode assembly 4 along the first direction Z. The support member 3 has a second gap 31, which is disposed opposite to the first gap 121 along the first direction Z. The support member 3 is used to support the electrode tabs 42 of the electrode assembly and seal the bottom of the first gap 121, so that the side of the first gap 121 facing away from the main body 41 along the first direction Z is a relatively sealed structure. In this embodiment, the support member 3 is made of insulating, high-temperature resistant, and electrolyte resistant material.

[0052] like Figure 5 and Figure 7 As shown, the electrode assembly 4 includes a main body 41 and an electrode tab 42, which are electrically connected to the main body 41. The main body 41 is disposed within the receiving cavity formed by the top cover plate 11 and the housing 2. The electrode tab 42 is inserted into the first gap 121 and the second gap 31 along the first direction Z. The electrode tab 42 passes through the second gap 31 and the first gap 121 sequentially from the main body 41 along the first direction Z.

[0053] The tab 42 is sealed to the support member 3. In this embodiment, the size of the second gap 31 of the support member 3 is adapted to the size of the tab 42. After the tab 42 passes through the second gap 31, it is squeezed into the second gap 31. After the tab 42 and the support member 3 are assembled, they can seal the bottom of the first gap 121, preventing the subsequent molten conductive material from contacting the main body 41 through the second gap 31 and causing damage to the electrode assembly 4. When manufacturing the battery cell, the support member 3 is first fixedly connected to the terminal post 12. One side of the support member 3 is fitted onto the tab 42, and the other side is fixed to the terminal post 12.

[0054] like Figure 3 As shown, the connector 5 is formed by solidifying molten conductive material. The connector 5 partially passes through the first gap 121 and connects to the support member 3. The connector 5 can seal the tab 42 and the terminal 12 respectively. Since the connector 5 is formed by solidifying molten conductive material, during the manufacturing of the battery cell, the conductive material is melted and filled into the first gap 121. After the conductive material cools, the terminals 12 can be connected and fixed. The conductive material can fill and seal the entire first gap 121, eliminating the need for additional welding to fix the terminals 12 and tab 42. In this embodiment, the conductive material used for the connector 5 can be tin, zinc, etc., preferably tin, which has the advantages of low melting point and good conductivity.

[0055] The battery cell has a support member 3 on the side of the terminal post 12 near the main body 41. The electrode tab 42 passes through the second gap 31 of the support member 3 and the first gap 121 of the terminal post 12, and is sealed to the support member 3. The support member 3 supports the electrode tab 42 to prevent deformation. The connector 5 is formed by solidifying molten conductive material. The support member 3 makes the side of the first gap 121 of the terminal post 12 near the main body 41 relatively sealed, preventing the molten conductive material from contacting the main body 41 and damaging the electrode assembly 4. The conductive material fills the first gap 121 and solidifies to form the connector 5, connecting the electrode tab 42 to the terminal post 12 and sealing the first gap 121. The connector 5 seals and connects the electrode tab 42 and the terminal post 12 respectively. A potting weld is formed between the connector 5, the electrode tab 42, and the terminal post 12. There are no requirements for the space of the first gap 121, which reduces the difficulty of the welding operation and helps to ensure the welding quality.

[0056] In some embodiments, the melting point of connector 5 is T1, the melting point of tab 42 is T2, and the melting point of post 12 is T3, satisfying that T1 < T2 and T1 < T3.

[0057] The melting point of connector 5 is lower than both the melting point of tab 42 and the melting point of post 12. When the molten conductive material fills the first gap 121, the post 12 and tab 42 will not melt due to heat, thus ensuring the strength of tab 42 and post 12 and reducing the speed of tab 42 due to high temperature.

[0058] In some embodiments, the pole post 12 is further provided with a first recess 122 on the side opposite to the main body 41 along the first direction Z, and the first recess 122 communicates with the first gap 121; the connector 5 includes a first connecting part 51 and a second connecting part 52 connected to each other, the first connecting part 51 is provided in the first gap 121, the first connecting part 51 seals the pole tab 42 and the pole post 12, and the second connecting part 52 is provided in the first recess 122.

[0059] like Figure 4, Figure 5 , Figure 7 and Figure 8 As shown, the first connecting portion 51 of the connector 5 is disposed within the first gap 121. The first connecting portion 51 can fixably connect the terminal post 12 and the electrode tab 42, and seal the first gap 121. The second connecting portion 52 is disposed within the first recess 122. The first recess 122 can reduce the height of the second connecting portion 52 exposed outside the terminal post 12, thereby reducing the height of the terminal post 12 and not occupying the internal space of the battery cell, thus improving the utilization rate of the internal space of the battery cell. At the same time, the second connecting portion 52 increases the connection strength between the connector 5 and the terminal post 12, and after the second connecting portion 52 is connected to the terminal post 12, it can seal the first gap 121, improve the sealing performance between the connector 5 and the terminal post 12, and prevent electrolyte leakage.

[0060] In this embodiment, the bottom of the first connecting part 51 is an open structure, and the first connecting part 51 fills the first gap 121 and wraps the electrode tab 42. The bottom wall of the first sink 122 is roughened by fretting or sanding to facilitate the filling of the molten conductive material into the first sink 122.

[0061] Compared to directly welding the tab 42 to the pole 12 for sealing, welding is difficult to achieve due to the smaller welding area and the generally smaller size of the tab 42, and the resulting seal between the tab and pole is also unstable. In this application, the second connecting part 52 is encapsulated and welded to the bottom and side walls of the first settling tank 122. This process is easy to implement and eliminates the need for direct welding of the tab to the pole, thus avoiding deformation and powdering caused by the high temperatures generated during welding, ensuring the stability of the tab. Furthermore, the welding and sealing between the second connecting part 52 and the side walls of the first settling tank 122 involves a relatively large welding area, making the process easier to implement, and resulting in a more stable seal between the second connecting part 52 and the side walls of the first settling tank 122 after welding.

[0062] In some embodiments, the battery cell further includes a second direction Y, the first direction Z and the second direction Y are perpendicular to each other, and the electrode post 12 is provided with a blind hole 123 on the side away from the main body 41 along the first direction Z. The blind hole 123 and the first gap 121 are spaced apart along the second direction Y, and the blind hole 123 communicates with the first sink 122. The connector 5 also includes a boss 53 connected to the second connecting part 52. The boss 53 is provided on the side of the second connecting part 52 facing the support member 3 along the first direction Z, and the boss 53 passes through the blind hole 123.

[0063] like Figure 10As shown, this embodiment differs from the previous embodiment only in the illustrated structure; the rest of the structure is the same. A blind hole 123 is provided on the side of the terminal post 12 away from the main body 41. The boss 53 of the connector 5 passes through the blind hole 123. After the boss 53 is connected to the second connecting part 52, it can increase the fixing strength between the connector 5 and the terminal post 12 and prevent the connector 5 from falling off. In this embodiment, the second direction Y is the width direction of the battery cell. There are two bosses 53 and two blind holes 123, and the bosses 53 and blind holes 123 correspond one-to-one. The two bosses 53 are located at both ends of the first gap 121 along the second direction Y.

[0064] In some embodiments, along the first direction Z, the diameter of the mounting hole 111 gradually decreases in the direction away from the main body 41. The mounting hole 111 has an inclined inner wall 1111. The outer periphery of the electrode post 12 has an outer wall surface 124, which is inclined relative to the first direction Z. The electrode post 12 has a first wall 120 facing the main body 41 along the first direction Z. The inner wall 1111 and the first wall 120 have a first included angle, and the outer wall surface 124 and the first wall 120 have a second included angle, which are equal. The battery cell also includes a sealing member 6, which surrounds the electrode post 12. The sealing member 6 is entirely disposed within the mounting hole 111, and the sealing member 6 is sealed to the outer wall surface 124 and the mounting hole 111 respectively.

[0065] The first and second included angles here can be understood as follows: the first oblique line is formed by the intersection of the cutting surface and the inner wall 1111, and the second oblique line is formed by the intersection of the cutting surface and the outer wall surface 124. The first and second oblique lines are set in parallel, the included angle between the first oblique line and the first wall 120 is the first included angle, and the included angle between the second oblique line and the first wall 120 is the second included angle.

[0066] like Figure 1 and Figure 7 As shown, the cutting plane perpendicular to the second direction Y intersects the inner wall 1111 to form a first oblique line, and the cutting plane perpendicular to the second direction Y intersects the outer wall surface 124 to form a second oblique line. The angle between the first oblique line and the first wall 120 is the first included angle α1, and the angle between the second oblique line and the first wall 120 is the second included angle α2. Both α1 and α2 are acute angles and are equal. This makes the forces on the inner and outer circumferences of the seal 6 more balanced, which helps to improve the sealing reliability of the seal 6.

[0067] In some embodiments, after the seal 6 is assembled between the pole post 12 and the top cover plate 11, it has an inner side surface 62 and an outer side surface 63. The inner side surface 62 is in contact with and parallel to the outer wall surface 124, and the outer side surface 63 is in contact with and parallel to the inner hole wall 1111. The outer side surface 63 has a third included angle β1 with the first wall 120, and the inner side surface 62 has a fourth included angle β2 with the first wall 120. The third included angle β1 and the fourth included angle β2 are both acute angles and are equal.

[0068] Furthermore, in some embodiments, α1 = β1, α2 = β2. This allows the seal 6 to fit more tightly with the electrode post 12 and the top cover plate 11, which helps to increase the area of ​​close contact between the seal 6 and the electrode post 12, thereby helping to improve the sealing performance of the battery cell.

[0069] For example, the first included angle α1, the second included angle α2, the third included angle β1, and the fourth included angle β2 can be any value from 0.5°, 1°, 2°, 5°, 10°, 11°, 12°, 15°, 18°, 20°, 25°, 30°, 35°, 38°, 40°, 43°, 45°, 46°, 50°, 54°, 60°, 62°, 64°, 65°, 68°, 70°, or any value from a range of any two of these values, without any specific limitation here.

[0070] like Figure 6 , Figure 7 and Figure 9 As shown, the inner wall 1111 of the assembly hole 111 and the outer wall surface 124 of the pole post 12 are both inclined relative to the first direction Z and parallel to each other. When the pole post 12 is partially inserted into the assembly hole 111, the inner wall 1111 of the assembly hole 111 contacts the outer wall surface 124 of the pole post 12 and squeezes the sealing member 6. The sealing member 6 fits more tightly with the pole post 12 and the top cover plate 11, and a slope seal is formed between the inner wall 1111 and the outer wall surface 124, increasing the sealing performance of the pole post 12 and the top cover plate 11 at the assembly hole 111. In one embodiment, the inner wall 1111 of the assembly hole 111 and the outer wall surface 124 of the pole post 12 abut against the sealing member 6 to increase the sealing performance.

[0071] Furthermore, since the seal 6 is arranged around the terminal post 12 and entirely within the mounting hole 111, no part of the seal 6 is located on the side of the top cover plate 11 along the first direction Z near the main body 41, which helps simplify the specific structure of the seal 6. At the same time, the outer wall surface 124 of the terminal post 12 and the inner hole wall 1111 together limit and compress the seal 6, eliminating the need for a separate support structure extending perpendicular to the first direction Z (i.e., radially extending along the terminal post 12) at the bottom of the terminal post 12 to compress the seal 6 along the first direction Z. This simplifies the structure of the terminal post 12 and also reduces the size of the terminal post 12 along the first direction Z, which helps improve space utilization and increases the energy density of the battery cell.

[0072] In some embodiments, the cover plate assembly 1 further includes a first insulating member 13 connected to the top cover plate 11. The first insulating member 13 is disposed on the side of the top cover plate 11 facing the main body portion 41 along the first direction Z. The first insulating member 13 is partially disposed between the outer wall surface 124 and the inner hole wall 1111, and the first insulating member 13 supports the sealing member 6.

[0073] like Figure 1 , Figure 7 and Figure 9 As shown, the cover plate assembly 1 has a first insulating member 13 on the side of the top cover plate 11 near the main body 41. The first insulating member 13 can insulate and isolate the top cover plate 11 from the main body 41, preventing the top cover plate 11 from becoming electrified. In addition, the first insulating member 13 is partially disposed between the outer wall surface 124 and the inner hole wall 1111 and supports the sealing member 6. The first insulating member 13 can restrict the movement of the sealing member 6 toward the main body 41, enhancing the stability of the sealing member 6, and can work together with the outer wall surface 124 and the inner hole wall 1111 to limit and compress the sealing member 6, improving the sealing reliability of the sealing member 6.

[0074] In some embodiments, the first insulating member 13 includes a first insulating portion 131 and a second insulating portion 132 connected to each other. The first insulating portion 131 is disposed on the side of the top cover plate 11 near the main body portion 41, and the second insulating portion 132 protrudes from the side of the first insulating portion 131 away from the main body portion 41. The second insulating portion 132 is disposed at an angle relative to the first direction Z. The second insulating portion 132 is at least partially pressed between the outer wall surface 124 and the inner hole wall 1111, and the second insulating portion 132 supports the sealing member 6.

[0075] like Figure 1 , Figure 7 and Figure 9 As shown, the first insulating part 131 is disposed on the side of the top cover plate 11 near the main body 41, serving to insulate and isolate the main body 41 and the top cover plate 11. The second insulating part 132 protrudes from the side of the first insulating part 131 away from the main body 41, and the second insulating part 132 is inclinedly disposed between the outer wall surface 124 and the inner hole wall 1111. The second insulating part 132 cooperates with the pole post 12 and the top cover plate 11 to limit and compress the sealing member 6, thereby improving the reliability of the sealing member 6. In one embodiment, the second insulating part 132 abuts against the bottom end 61 of the sealing member 6 near the main body 41.

[0076] In this embodiment, a stepped structure is provided between the first insulating part 131 and the second insulating part 132. The second insulating part 132 is offset relative to the first insulating part 131 towards the top cover plate 11 along the first direction Z, which can reduce the size of the second insulating part 132 along the first direction Z and further improve the space utilization rate inside the battery cell.

[0077] In some embodiments, the pole post 12 includes a first conductive portion 125 and a second conductive portion 126 connected to each other. A first gap 121 penetrates the first conductive portion 125 along a first direction Z. The first conductive portion 125 is disposed on the side of the second conductive portion 126 facing the main body portion 41 along the first direction Z. The pole post 12 has a composite interface 129 formed by connecting the first conductive portion 125 and the second conductive portion 126. The sealing member 6 has a bottom end 61 near the main body portion 41. The bottom end 61 is located on the side of the composite interface 129 near the main body portion 41.

[0078] like Figure 4 , Figure 5 As shown, the first conductive portion 125 and the second conductive portion 126 of the electrode post 12 are stacked along the first direction Z. The first conductive portion 125 and the second conductive portion 126 can be formed by using different materials to form the negative electrode post 12, thereby reducing the manufacturing cost of the battery cell. In this embodiment, the first conductive portion 125 is specifically made of copper, and the second conductive portion 126 is specifically made of aluminum. The aluminum and copper parts are connected in a composite manner to form the negative electrode post 12. This not only meets the electrical connection requirements between the negative electrode post 12 and the electrode assembly 4, but also saves copper usage, thereby reducing manufacturing costs.

[0079] In one embodiment, along the first direction Z, the orthographic projection of the inner bore wall 1111 onto the main body 41 and the orthographic projection of the first conductive part 125 onto the main body 41 at least partially overlap. Thus, when the electrode post 12 is subjected to an external force in a direction away from the main body 41, the inner bore wall 1111 can provide a reaction force to the first conductive part 125 through the seal 6. This reaction force can offset part of the external force, thereby reducing the stress at the connection point (i.e., the composite interface 129) between the first conductive part 125 and the second conductive part 126, and thus helping to improve the reliability of the electrode post 12.

[0080] Furthermore, along the first direction Z, the orthographic projection of the inner hole wall 1111 onto the main body 41 and the orthographic projection of the second conductive part 126 onto the main body 41 at least partially overlap. Thus, when the electrode post 12 is subjected to an external force in a direction away from the main body 41, the inner hole wall 1111 can provide a reaction force to the second conductive part 126 through the seal 6. This reaction force can offset part of the external force, thereby reducing the stress at the connection point (i.e., the composite interface 129) between the first conductive part 125 and the second conductive part 126, and thus helping to improve the reliability of the electrode post 12.

[0081] The bottom end 61 of the seal 6 is located on the side of the composite interface 129 closer to the main body 41. The seal 6 can seal the composite interface 129, effectively preventing the possibility of electrolyte damaging the composite interface 129, because the composite interface 129 is connected by different materials, and electrolyte entering the composite interface 129 will cause electrochemical corrosion. In this embodiment, the top end of the seal 6 is located on the side of the composite interface 129 away from the main body 41, that is, the seal 6 completely covers the composite interface 129; in other embodiments, the top end of the seal 6 may also be located on the side of the composite interface 129 closer to the main body 41, that is, the seal 6 completely covers the first conductive part 125. In some embodiments, the electrode post 12 may be formed entirely of only one material, omitting the second conductive part 126.

[0082] In some embodiments, a third sink 1261 is provided on the side of the second conductive part 126 away from the electrode assembly 4. The third sink 1261 has a bottom 1262. A second sink 127 is provided on the side of the bottom 1262 away from the electrode assembly 4. The second sink 127 communicates with the first gap 121. The bottom 1262 completely covers the first conductive part 125 along the first direction Z. The connector 5 is partially disposed in the second sink 127.

[0083] like Figure 11 As shown, this embodiment differs from the aforementioned embodiment only in the illustrated structure; all other structures are the same. A third sink 1261 is provided on the second conductive part 126. The bottom 1262 of the third sink 1261 completely covers the first conductive part 125. The second connecting part 52 of the connector 5 can also completely cover the first conductive part 125, ensuring that the first conductive part 125 is not exposed at the second sink 127, thus protecting the first conductive part 125. Typically, the first conductive part 125 is made of copper, which is more prone to oxidation than the aluminum part of the second conductive part 126. Covering the first conductive part 125 with the sink bottom 1262 reduces oxidation damage. Simultaneously, the third sink 1261 facilitates the filling of molten conductive material to form the connector 5. The second connecting part 52 of the connector 5 is welded to the sink bottom 1262 to form a sealed connection; that is, the potting weld can be performed within the third sink 1261, facilitating the welding process.

[0084] In this embodiment, a second sink 127 is provided at the bottom 1262 of the third sink 1261. The second sink 127 can accommodate the second connecting part 52 of the connector 5. Molten conductive material is filled in the second sink 127 to improve the sealing performance of the pole 12 at the first gap 121.

[0085] In some embodiments, the pole post 12 further includes a flange 128 connected to the second conductive portion 126. The flange 128 is disposed on the side of the pole post 12 away from the main body portion 41 along the first direction Z, and the flange 128 is disposed around the second conductive portion 126. The cover plate assembly 1 further includes a second insulating member 14, which is disposed around the pole post 12. The second insulating member 14 insulates and isolates the pole post 12 from the top cover plate 11. The second insulating member 14 is partially disposed between the outer wall surface 124 and the inner hole wall 1111.

[0086] like Figure 5 , Figure 7 and Figure 9 As shown, the electrode post 12 has a flange 128 formed on the side of the second conductive portion 126 away from the main body portion 41. The flange 128 can limit the movement of the top cover plate 11. After engaging with the inner wall 1111 of the mounting hole 111, the electrode post 12 is fixed in the mounting hole 111, preventing the electrode post 12 from detaching from the mounting hole 111, that is, preventing the electrode post 12 from moving towards the main body portion 41. The second insulating member 14 is partially disposed between the outer wall surface 124 and the inner wall 1111, which can insulate and isolate the outer wall surface 124 of the electrode post 12 from the inner wall 1111 of the mounting hole 111, that is, insulate and isolate the electrode post 12 and the top cover plate 11, which can prevent the top cover plate 11 from becoming charged and improve the insulation performance of the battery cell.

[0087] In some embodiments, the second insulating member 14 includes a third insulating portion 141 and a fourth insulating portion 142 connected to each other. The third insulating portion 141 is at least partially pressed between the flange portion 128 and the top cover plate 11 along the first direction Z. The fourth insulating portion 142 protrudes from the side of the third insulating portion 141 near the main body portion 41. The fourth insulating portion 142 is inclined relative to the first direction Z. The fourth insulating portion 142 is at least partially disposed between the outer wall surface 124 and the inner hole wall 1111, and the fourth insulating portion 142 abuts against the sealing member 6.

[0088] The third insulating portion 141 of the second insulating member 14 is at least partially pressed between the flange portion 128 and the top cover plate 11, and the third insulating portion 141 insulates and isolates the flange portion 128 and the top cover plate 11; the fourth insulating portion 142 is inclined relative to the first direction Z and is partially disposed between the outer wall surface 124 and the inner hole wall 1111, which can insulate and isolate the pole post 12 and the top cover plate 11, thereby improving the insulation between the pole post 12 and the top cover plate 11.

[0089] In addition, the fourth insulating part 142 abuts against the seal 6, which can limit the seal 6 from moving away from the electrode assembly 4 under external force, thereby helping to improve the stability of the pole post 12, and can better limit and compress the seal 6 in conjunction with the outer wall surface 124 and the inner hole wall 1111, thereby helping to improve the sealing reliability of the seal 6.

[0090] In some embodiments, the second insulating member 14 further includes a fifth insulating portion 143 connected to the third insulating portion 141, the fifth insulating portion 143 being disposed around the flange portion 128, and the fifth insulating portion 143 being sealed to the flange portion 128.

[0091] like Figure 9 As shown, the second insulating member 14 surrounds the flange portion 128 to form a fifth insulating portion 143. The fifth insulating portion 143 can extend the insulation distance between the flange portion 128 and the top cover plate 11, thereby effectively increasing the insulation performance and helping to reduce the risk of short circuit in the battery cell.

[0092] In some embodiments, the top cover 11 further includes an end cap 112 and a bevel 113 connected to each other. The bevel 113 protrudes from the side of the end cap 112 away from the main body 41. The bevel 113 is inclined relative to the first direction Z. The bevel 113 surrounds the pole post 12. The end cap 112 and the bevel 113 enclose to form an assembly hole 111. The third insulating portion 141 is at least partially disposed between the bevel 113 and the flange 128. The fourth insulating portion 142 is sandwiched between the bevel 113 and the outer wall surface 124.

[0093] like Figure 1 and Figure 9 As shown, the top cover 11 consists of an end cap 112 and a bevel 113. The bevel 113 is arranged around the terminal post 12. The bevel 113 can increase the size of the through hole along the first direction Z, apply pressure to the seal 6 and limit the terminal post 12, thereby increasing the stability of the terminal post 12. The third insulating part 141 is partially disposed between the bevel 113 and the flange 128, and the fourth insulating part 142 is pressed between the bevel 113 and the outer wall surface 124. The third insulating part 141 and the fourth insulating part 142 achieve insulation isolation between the terminal post 12 and the bevel 113, improve the insulation of the battery cell, reduce the risk of short circuit of the battery cell, and can also better limit the terminal post 12, thereby increasing the stability of the terminal post 12.

[0094] This utility model also provides an embodiment of a battery pack, including a battery cell. The specific structure of the battery cell is the same as that of the battery cell described in any of the above embodiments, and will not be repeated here.

[0095] In summary, this utility model embodiment provides a battery cell and a battery pack. A support member is provided on the side of the electrode post near the main body. The electrode tab passes through both the second gap of the support member and the first gap of the electrode post, and is sealed to the support member. The support member supports the electrode tab to prevent deformation. The connector is formed by solidifying molten conductive material. The support member makes the side of the first gap of the electrode post near the main body a relatively sealed structure, preventing the molten conductive material from contacting the main body and damaging the electrode assembly. The conductive material fills the first gap and then solidifies to form the connector, connecting the electrode tab to the electrode post and sealing the first gap. The connector seals and connects the electrode tab and the electrode post respectively. A potting weld is formed between the connector, the electrode tab, and the electrode post. There are no requirements for the space of the first gap, which reduces the difficulty of the welding operation and helps to ensure the welding quality.

[0096] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery cell having a first orientation, characterized in that, include: A cover plate assembly includes a top cover plate and an electrode post. The top cover plate has an assembly hole that extends through the top cover plate along a first direction. The electrode post passes through the assembly hole and has a first gap that extends through the electrode post along the first direction. A support member is fixedly connected to the pole post, and the support member is provided with a second gap, which is arranged opposite to the first gap along the first direction. An electrode assembly includes a main body and an electrode tab electrically connected to the main body. The electrode tab is disposed along a first direction through a first gap and a second gap. The electrode tab is sealed to a support member. The support member is disposed on the side of the electrode post close to the main body along the first direction. A connector is partially inserted through the first gap and connected to the support member, and the connector seals the electrode lug and the electrode post respectively.

2. The battery cell according to claim 1, characterized in that, The melting point of the connector is T1, the melting point of the tab is T2, and the melting point of the post is T3, satisfying that: T1 < T2 and T1 < T3.

3. The battery cell according to claim 1 or 2, characterized in that, The pole post is also provided with a first sink groove on the side away from the main body along the first direction, and the first sink groove is connected to the first gap. The connector includes a first connecting part and a second connecting part connected to each other. The first connecting part is disposed in the first gap and seals the electrode lug and the electrode post. The second connecting part is disposed in the first sink.

4. The battery cell according to claim 3, characterized in that, The battery cell also includes a second direction, the first direction and the second direction are perpendicular to each other, and the electrode post is provided with a blind hole on the side away from the main body along the first direction. The blind hole and the first gap are spaced apart along the second direction, and the blind hole communicates with the first sink. The connector further includes a boss connected to the second connecting portion. The boss is located on the side of the second connecting portion facing the support member along the first direction, and the boss passes through the blind hole.

5. The battery cell according to claim 1 or 2, characterized in that, Along the first direction, the diameter of the assembly hole gradually decreases in the direction away from the main body. The assembly hole has an inclined inner wall. The outer periphery of the pole post has an outer wall surface. The outer wall surface is inclined relative to the first direction. The pole post has a first wall facing the main body along the first direction. The inner wall and the first wall have a first angle. The outer wall surface and the first wall have a second angle. The first angle and the second angle are equal. The battery cell also includes a sealing element, which is arranged around the terminal post and is entirely located within the assembly hole. The sealing element is respectively sealed to the outer wall surface and the assembly hole.

6. The battery cell according to claim 5, characterized in that, The cover plate assembly further includes a first insulating member connected to the top cover plate. The first insulating member is disposed on the side of the top cover plate facing the main body in the first direction. The first insulating member is partially disposed between the outer wall surface and the inner hole wall, and the first insulating member supports the sealing member.

7. The battery cell according to claim 6, characterized in that, The first insulating member includes a first insulating portion and a second insulating portion connected to each other. The first insulating portion is disposed on the side of the top cover plate close to the main body portion, and the second insulating portion protrudes from the side of the first insulating portion away from the main body portion. The second insulating portion is inclined relative to the first direction. The second insulating portion is at least partially pressed between the outer wall surface and the inner hole wall, and the second insulating portion supports the sealing member.

8. The battery cell according to claim 7, characterized in that, The electrode post includes a first conductive part and a second conductive part connected to each other. The first gap penetrates the first conductive part along the first direction. The first conductive part is disposed on the side of the second conductive part facing the main body along the first direction. The electrode post has a composite interface formed by the connection of the first conductive part and the second conductive part. The sealing member has a bottom end near the main body. The bottom end is located on the side of the composite interface near the main body.

9. The battery cell according to claim 8, characterized in that, A third sink is provided on the side of the second conductive part away from the electrode assembly. The third sink has a bottom. A second sink is provided on the side of the bottom away from the electrode assembly. The second sink communicates with the first gap. The bottom completely covers the first conductive part along the first direction. The connector part is provided in the second sink.

10. The battery cell according to claim 8, characterized in that, The electrode post further includes a flanged portion connected to the second conductive portion. The flanged portion is disposed on the side of the electrode post away from the main body along the first direction, and the flanged portion is disposed around the second conductive portion. The cover plate assembly further includes a second insulating member, which is disposed around the pole post and insulatingly isolates the pole post from the top cover plate. The second insulating member is partially disposed between the outer wall surface and the inner hole wall.

11. The battery cell according to claim 10, characterized in that, The second insulating member includes a third insulating portion and a fourth insulating portion connected together. The third insulating portion is at least partially pressed between the flange and the top cover plate along the first direction. The fourth insulating portion protrudes from the third insulating portion on the side near the main body. The fourth insulating portion is inclined relative to the first direction. The fourth insulating portion is at least partially disposed between the outer wall surface and the inner hole wall, and the fourth insulating portion abuts against the sealing member.

12. The battery cell according to claim 11, characterized in that, The second insulating member further includes a fifth insulating portion connected to the third insulating portion, the fifth insulating portion being disposed around the flange portion, and the fifth insulating portion being sealed to the flange portion.

13. The battery cell according to claim 12, characterized in that, The top cover also includes an end cap and a beveled edge connected together. The beveled edge protrudes from the side of the end cap away from the main body. The beveled edge is inclined relative to the first direction. The beveled edge surrounds the pole post. The end cap and the beveled edge together form the assembly hole. The third insulating part is at least partially disposed between the beveled edge and the flanged part. The fourth insulating part is sandwiched between the beveled edge and the outer wall surface.

14. A battery pack, characterized in that, Includes the battery cell described in any one of claims 1-13.

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