Battery pole assembly

Abstract

The utility model discloses a battery pole assembly which comprises a pole piece and a connecting assembly, the connecting assembly comprises a lower fixing piece, a top cover piece and an upper fixing piece, the lower fixing piece, the top cover piece and the upper fixing piece are provided with pole holes, and the pole piece penetrates through the pole holes and is axially limited and clamped; the pole hole wall of the upper fixing piece and the peripheral wall of the pole piece are correspondingly provided with knurling solid sealing structures, and the bulge of one of the knurling solid sealing structures is correspondingly meshed with the groove of the other one of the knurling solid sealing structures; one of the opposite side walls of the top cover piece and the upper fixing piece is provided with an annular bulge, the periphery of the annular bulge is provided with limiting teeth, the other one is provided with a limiting groove, the limiting groove penetrates through the pole hole wall, the annular bulge is inserted into the pole hole of the other one, and the limiting teeth are clamped in the corresponding limiting groove; one of the opposite side walls of the top cover piece and the upper fixing piece is provided with a groove part, the width of the groove part is gradually reduced from the closed end to the open end, the other side wall is provided with a protruding part, the protruding part and the groove part are matched in an inserted mode, and the protruding part and the groove part are located on the peripheries of the limiting teeth and the limiting grooves. According to the utility model, a multi-sealing structure is adopted, so that the torque bearing capacity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pole assembly. Background Art

[0002] As a carrier for storing electrical energy, batteries play an important role in the consumer sector, power vehicles, energy storage industry, and high-tech fields such as aviation, aerospace, and navigation, and occupy an important position in the field of new energy. As an important component of the battery, the electrode is directly connected to the battery bus at one end and to the external conductor at the other end, or connected in series and parallel when the battery module or pack is used. When the electrode is riveted or connected to the battery top cover, it must be able to withstand a certain torque to prevent the connection structure between the electrode and the top cover from rotating, offset, or damage to the insulating parts, resulting in leakage, poor sealing, or internal short circuit in the battery cell; and when the battery is used for a long time or in a high temperature environment, gas is easily generated inside the battery to increase the internal pressure. The connection structure strength of the pole assembly is not enough, which may cause the parts of the pole assembly to loosen, affecting the normal use of the battery.

[0003] At present, the connection structure between the electrode and the top cover is mostly made by laser welding, riveting and injection molding and rubber coating. However, poor welding and foreign matter impurities are likely to occur during the laser welding process, and the welding tightness is difficult to detect, which reduces the product quality. When the riveting connection method is used, the pole assembly has many and complex parts, the pole assembly manufacturing process is complicated, the assembly is delicate and easy to make mistakes, it is difficult to achieve automated assembly, and the processing and assembly cost is high. When the injection molding and rubber coating is used, the pole assembly connection design and manufacturing assembly process are complicated, inefficient, and costly. The anti-rotation and torque bearing performance of the pole assembly is poor, which can easily cause the connection between the pole assembly and the top cover to loosen.

[0004] Therefore, how to provide a battery pole assembly that improves torque bearing capacity, has a simple process, high feasibility of automated assembly, and high product quality is a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0005] The utility model aims to provide a battery pole assembly, which improves torque bearing capacity, has simple process, high feasibility of automated assembly and high product quality, which is a technical problem that technical personnel in this field urgently need to solve.

[0006] In order to solve the above technical problems, the utility model provides a battery pole assembly, including a pole piece and a connecting assembly, wherein the connecting assembly includes a lower fixing piece, a top cover sheet and an upper fixing piece which are sequentially arranged from bottom to top, and the three are correspondingly provided with pole holes, and the pole piece passes through the corresponding pole hole and is axially limited and clamped with the connecting assembly;

[0007] The pole hole wall of the upper fixing member and the peripheral wall of the pole member are correspondingly provided with knurled sealing structures distributed along the circumferential direction, wherein a protrusion of one knurled sealing structure and a groove of another knurled sealing structure are correspondingly engaged;

[0008] One of the top cover sheet and the opposite side wall of the upper fixing member is provided with an annular protrusion, and the outer periphery of the annular protrusion is provided with a limiting tooth, and the other has a limiting groove, and the limiting groove passes through the corresponding pole hole wall, the annular protrusion is inserted into the pole hole of the other, and the limiting tooth is clamped in the corresponding limiting groove;

[0009] One of the opposite side walls of the top cover sheet and the upper fixing member is provided with a groove portion, the width of which gradually decreases from the closed end to the open end, and the other is provided with a protrusion portion matching the groove portion, the protrusion portion and the groove portion are plug-fitted together, and the protrusion portion and the groove portion are located on the periphery of the limiting tooth and the limiting groove.

[0010] The battery pole assembly of the utility model adopts a multiple sealing structure to improve its structural strength and torque bearing capacity when it is subjected to lateral external force torque and longitudinal external force torque, wherein:

[0011] When the battery pole assembly is subjected to a lateral external force torque, the knurled sealing structure between the upper fixing member and the pole member can perform the first force release and anti-torsion; the clamping sealing structure of the limiting teeth and the limiting groove between the top cover sheet and the upper fixing member can perform the second force release and anti-torsion; at the same time, the clamping sealing structure of the protrusion and the groove between the top cover sheet and the upper fixing member can perform the third force release and anti-torsion. Through this triple sealing structure, the connection strength of the battery pole assembly in the lateral direction can be ensured, and the anti-rotation ability and torque bearing capacity of the battery pole assembly as a whole under external force in the lateral direction can be enhanced;

[0012] When the battery pole assembly is subjected to an external force and torque in the longitudinal direction, the axial limiting snap-in structure between the pole member and the connecting assembly can achieve force release and torsion resistance in the area near the middle of the battery pole assembly, and the snap-in sealing structure between the protrusion and the groove between the top cover plate and the upper fixing member can achieve force release and torsion resistance in the area near the periphery of the battery pole assembly, thereby ensuring the longitudinal connection strength of the battery pole assembly and enhancing the overall anti-rotation ability and torque bearing capacity of the battery pole assembly under external force in the longitudinal direction.

[0013] At the same time, in the battery pole assembly of the utility model, the lower fixing part and the upper fixing part can both be injection molded parts, and the battery pole assembly can adopt an injection molding assembly process. Compared with the laser welding, riveting and injection molding connection methods in the prior art, the process is simple, the feasibility of automated assembly is high, and the product quality is high.

[0014] Optionally, the pole piece includes a first connecting segment, a second connecting segment and a third connecting segment connected sequentially from top to bottom, the second connecting segment has the smallest diameter, the pole hole of the upper fixing member includes a first diameter segment and a second diameter segment connected sequentially from top to bottom, the inner diameter of the second diameter segment is equal to the outer diameter of the second connecting segment,

[0015] The second connecting section and the second diameter section are plug-fitted together, the first connecting section and the first diameter section are plug-fitted together, and the knurled sealing structure is arranged on the relative peripheral walls of the first diameter section and the first connecting section.

[0016] Optionally, the knurled sealing structure disposed on the inner wall of the first diameter section is a first knurled sealing structure, and the knurled sealing structure disposed on the peripheral wall of the first connecting section is a second knurled sealing structure.

[0017] There is a distance between the upper end of the first knurled sealing structure and the upper end wall of the upper fixing member, the first connecting section forms an upper limit portion at the upper end of the second knurled sealing structure, the upper end of the second knurled sealing structure and the lower end wall of the upper limit portion are connected as a whole, and the lower end wall of the upper limit portion is in contact with the upper end wall of the first knurled sealing structure.

[0018] Optionally, the height of the first diameter section and the first connecting section is H1, the height of the knurled sealing structure is H2, and the value range of H2 is: 1 / 2H1<H2<4 / 5H2;

[0019] The depth of the protrusion of the knurled sealing structure is D1, the maximum width of the protrusion of the knurled sealing structure is W1, and the value range of D1 is: D1≥2 / 3W1.

[0020] Optionally, the longitudinal height of the protruding portion and the groove portion is H3, the longitudinal height of the limiting tooth and the limiting groove is H4, and H3≠H4.

[0021] Optionally, the width of the inlet end of the limiting groove is L1, the width of the end end of the limiting groove is L2, and L1<L2;

[0022] And / or, the corners of the limiting teeth and the limiting grooves are rounded.

[0023] Optionally, the opening end of the groove portion is further provided with a guide port, the guide port and the groove portion are connected, the width of the guide port is L3, the width of the opening end of the groove portion is L4, and L3>L4;

[0024] And / or, there are multiple protrusions and multiple grooves, and the multiple protrusions are arranged rotationally symmetrically, and the multiple grooves are arranged rotationally symmetrically;

[0025] And / or, there are multiple limiting teeth and multiple limiting grooves, and the multiple limiting teeth are rotationally symmetrically arranged, and the multiple limiting grooves are rotationally symmetrically arranged.

[0026] Optionally, it also includes a sealing ring, the inner circumferential wall of the sealing ring is sealed to the circumferential wall of the pole piece, and the outer circumferential wall of the sealing ring is sealed to at least part of the pole hole wall of the lower fixing piece; and / or, the inner circumferential wall of the sealing ring is sealed to the circumferential wall of the pole piece, and the outer circumferential wall of the sealing ring is sealed to at least part of the pole hole wall of the top cover plate.

[0027] Optionally, the pole piece further includes a fourth connecting section connected to the lower end of the third connecting section, a third step surface facing the upper end is formed between the third connecting section and the fourth connecting section, an annular notch is provided on the lower side wall of the top cover sheet, and the annular notch is radially connected to the pole hole of the top cover sheet,

[0028] The pole hole of the lower fixing member includes a third diameter section and a fourth diameter section connected from top to bottom, the third connecting section is located inside the third diameter section and the pole hole of the top cover sheet, and the diameter of the third diameter section is greater than the diameter of the third connecting section.

[0029] The inner circumferential wall of the sealing ring fits with the circumferential wall of the third connecting section, the outer circumferential wall of the sealing ring fits with the inner circumferential wall of the third diameter section and the circumferential wall of the annular notch, the upper side wall of the sealing ring fits with the end wall of the annular notch, and the lower side wall of the sealing ring fits with the third step surface.

[0030] Optionally, a fourth step surface is formed between the third diameter segment and the fourth diameter segment, the fourth connecting segment is partially located inside the fourth diameter segment, the third step surface and the fourth step surface are in contact with each other, and the fourth connecting segment and the fourth diameter segment are limited in the circumferential direction;

[0031] And / or, the fitting surfaces of the lower fixing member and the top cover sheet are in a two-step structure and gradually rise from the outside to the inside.

[0032] Optionally, the lower fixing member and the upper fixing member are both injection-molded parts, and the battery pole assembly is assembled using an injection molding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A top view of a specific embodiment of a battery pole assembly provided by the utility model;

[0034] Figure 2 for Figure 1 A split diagram of the battery terminal assembly;

[0035] Figure 3 for Figure 1Axial cross-sectional view of the battery terminal assembly;

[0036] Figure 4 for Figure 1 A schematic diagram of the structure of the junction between the pole piece and the upper fixing piece in the battery pole assembly;

[0037] Figure 5 for Figure 1 A schematic diagram of the structure of the upper fixing member in the battery pole assembly;

[0038] Figure 6 for Figure 1 A schematic diagram of the structure of the top cover sheet in the battery pole assembly;

[0039] Figure 7 for Figure 1 A transverse cross-sectional view of the connection between the upper fixing member and the top cover sheet in the battery pole assembly;

[0040] Figure 8 for Figure 1 A schematic diagram of the structure of a pole piece in a battery pole assembly;

[0041] Fig. 9 for Figure 5 A schematic diagram of the structure of the upper fixing member at a second angle;

[0042] Fig.10 for Figure 5 a longitudinal sectional view of the upper fixing member;

[0043] Fig.11 for Figure 4 A partial enlarged view of

[0044] Fig.12 for Figure 1 A transverse cross-sectional view of the engagement of the knurled sealing structure in the battery pole assembly;

[0045] Fig.13 for Figure 6 a longitudinal cross-sectional view of the top cover sheet;

[0046] Fig.14 for Figure 7 A partial enlarged view of the middle limit slot;

[0047] Fig.15 for Figure 3 A partial enlarged view of the mating position of the protrusion and the groove;

[0048] in, Figure 1-Figure 15 The reference numerals in the figures are described as follows:

[0049] 1-pole member; 11-first connecting section; 111-upper limit portion; 12-second connecting section; 13-third connecting section; C-second step surface; 14-fourth connecting section; D-third step surface;

[0050] 2-lower fixing piece; E-fourth step surface;

[0051] 3-top cover; 3a-limiting groove; 3b-groove portion; 3c-flow guide port; 3d-annular notch;

[0052] 4-upper fixing member; 4a1-first diameter section; 4a2-second diameter section; B-first step surface;

[0053] 51- annular protrusion; 52- limiting tooth;

[0054] 6- raised part;

[0055] 7- Sealing ring;

[0056] O-pole hole;

[0057] A-Knurled seal structure. DETAILED DESCRIPTION

[0058] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0059] The “plurality” mentioned herein generally means more than two; and when “plurality” is used to indicate the number of certain components, it does not indicate the relationship between the quantities of these components.

[0060] Please refer to Figure 1-Figure 7 , Figure 1 A top view of a specific embodiment of a battery pole assembly provided by the utility model; Figure 2 for Figure 1 A split diagram of the battery terminal assembly; Figure 3 for Figure 1 Axial cross-sectional view of the battery terminal assembly; Figure 4 for Figure 1 A schematic diagram of the structure of the junction between the pole piece and the upper fixing piece in the battery pole assembly; Figure 5 for Figure 1 A schematic diagram of the structure of the upper fixing member in the battery pole assembly; Figure 6 for Figure 1 A schematic diagram of the structure of the top cover sheet in the battery pole assembly; Figure 7 for Figure 1 A transverse cross-sectional view of the connection between the upper fixing member and the top cover plate in the battery pole assembly.

[0061] The utility model provides a battery pole assembly, including a pole piece 1 and a connecting assembly, wherein the connecting assembly includes a lower fixing piece 2, a top cover sheet 3 and an upper fixing piece 4 which are sequentially arranged from bottom to top, and the three are correspondingly provided with pole holes O, and the pole piece 1 passes through the corresponding pole hole O and is axially limited and clamped with the connecting assembly;

[0062] The pole hole wall of the upper fixing member 4 and the peripheral wall of the pole member 1 are correspondingly provided with knurled sealing structures A distributed along the circumferential direction, wherein the protrusion of one knurled sealing structure A and the groove of another knurled sealing structure A are correspondingly engaged, so as to realize the circumferential limiting connection between the upper fixing member 4 and the pole member 1;

[0063] In the opposite side walls of the top cover sheet 3 and the upper fixing member 4, one is provided with an annular protrusion 51, and the outer circumference of the annular protrusion 51 is provided with a limiting tooth 52, and the other is correspondingly provided with a limiting groove 3a, the limiting groove 3a passes through the corresponding pole hole wall, the annular protrusion 51 is inserted into the pole hole of the other, and the limiting tooth 52 is clamped in the corresponding limiting groove 3a, so as to realize the circumferential limiting connection between the top cover sheet 3 and the upper fixing member 4;

[0064] In the opposite side walls of the top cover piece 3 and the upper fixing piece 4, one is provided with a groove portion 3b, the width of the groove portion 3b gradually decreases from the closed end to the open end, and the other is provided with a protrusion 6 matching the groove portion 3b, the protrusion 6 and the groove portion 3b are plug-fitted together, and the protrusion 6 and the groove portion 3b are located at the periphery of the limiting teeth 52 and the limiting groove 3a, further realizing the circumferential limiting connection and the longitudinal limiting connection between the top cover piece 3 and the upper fixing piece 4.

[0065] The battery pole assembly of the utility model adopts a multiple sealing structure to improve its structural strength and torque bearing capacity when it is subjected to lateral external force torque and longitudinal external force torque, wherein:

[0066] When the battery pole assembly is subjected to a lateral external force torque, the knurled sealing structure A between the upper fixing member 4 and the pole member 1 can perform the first force release and anti-torsion; the clamping sealing structure of the limiting teeth 52 and the limiting groove 3a between the top cover sheet 3 and the upper fixing member 4 can perform the second force release and anti-torsion; at the same time, the clamping sealing structure of the protrusion 6 and the groove portion 3b between the top cover sheet 3 and the upper fixing member 4 can perform the third force release and anti-torsion. Through this triple sealing structure, the connection strength of the battery pole assembly in the lateral direction can be ensured, and the anti-rotation ability and torque bearing capacity of the battery pole assembly as a whole under external force in the lateral direction can be enhanced;

[0067] When the battery pole assembly is subjected to an external torque in the longitudinal direction, the axial limiting snap-in structure between the pole member 1 and the connecting assembly can achieve force release and torsion resistance in the area near the middle of the battery pole assembly, and the snap-in sealing structure of the protrusion 6 and the groove 3b between the top cover sheet 3 and the upper fixing member 4 can achieve force release and torsion resistance in the area near the periphery of the battery pole assembly, thereby ensuring the longitudinal connection strength of the battery pole assembly and enhancing the overall anti-rotation ability and torque bearing capacity of the battery pole assembly under external forces in the longitudinal direction.

[0068] At the same time, in the battery pole assembly of the utility model, the lower fixing part 2 and the upper fixing part 4 can both be injection molded parts, and the battery pole assembly can adopt an injection molding assembly process. Compared with the laser welding, riveting and injection molding connection methods in the prior art, the process is simple, the feasibility of automated assembly is high, and the product quality is high.

[0069] Please refer to Figure 3 , Figure 8-Figure 11 , Figure 8 for Figure 1 A schematic diagram of the structure of a pole piece in a battery pole assembly; Fig. 9 for Figure 5 A schematic diagram of the structure of the upper fixing member at a second angle; Fig.10 for Figure 5 a longitudinal sectional view of the upper fixing member; Fig.11 for Figure 4 A partial enlarged view of .

[0070] In this embodiment, the specific structure and matching relationship between the upper fixing member 4 and the pole member 1 are as follows:

[0071] The pole piece 1 comprises a first connecting section 11, a second connecting section 12 and a third connecting section 13 connected in sequence from top to bottom, and the second connecting section 12 has the smallest diameter;

[0072] The pole hole O of the upper fixing member 4 includes a first diameter section 4a1 and a second diameter section 4a2 connected in sequence from top to bottom. The inner diameter of the second diameter section 4a2 is equal to the outer diameter of the second connecting section 12.

[0073] The second connecting section 12 and the second diameter section 4a2 are inserted and matched, the first connecting section 11 and the first diameter section 4a1 are inserted and matched, and the knurled sealing structure A is arranged on the relative peripheral walls of the first diameter section 4a1 and the first connecting section 11.

[0074] Depend on Figure 3 It can be seen that, through the structural design of the upper fixing member 4 and the pole member 1 as described above, the upper fixing member 4 and the pole member 1 form a "H"-shaped solid sealing structure at the junction, so as to realize the axial limit connection between the upper fixing member 4 and the pole member 1, improve the connection strength between the upper fixing member 4 and the pole member 1 in the longitudinal direction, and enhance the anti-rotation ability and torque bearing capacity of the battery pole assembly as a whole in the longitudinal direction under external force;

[0075] At the same time, by Fig.11 It can be seen that the first connecting section 11 and the first diameter section 4a1 are engaged and sealed by the knurled sealing structure A, so as to realize the lateral limit connection between the pole member 1 and the upper fixing member 4, improve the lateral connection strength between the upper fixing member 4 and the pole member 1, and enhance the overall anti-rotation ability and torque bearing capacity of the battery pole assembly under external forces in the lateral direction.

[0076] Further, the knurled sealing structure A disposed on the inner wall of the first diameter section 4a1 is defined as a first knurled sealing structure, and the knurled sealing structure A disposed on the peripheral wall of the first connecting section 11 is defined as a second knurled sealing structure;

[0077] Depend on Fig.10 and Fig.11 It can be seen that there is a distance between the upper end of the first knurled sealing structure and the upper end wall of the upper fixing member 4, the first connecting section 11 forms an upper limit positioning portion 111 at the upper end of the second knurled sealing structure, the upper end of the second knurled sealing structure and the lower end wall of the upper limit positioning portion 111 are connected as a whole, and the lower end wall of the upper limit positioning portion 111 is in contact with the upper end wall of the first knurled sealing structure.

[0078] As configured above, the knurled sealing structure A is a non-through mode in the longitudinal direction of the first diameter segment 4a1 and the first connecting segment 11. Adding this non-through knurled sealing structure A at the upper end of the "J"-type sealing structure can play a role in force relief and buffering when the battery pole assembly is subjected to longitudinal external force. For example, when the battery pole assembly is subjected to longitudinal upward external force, the pole member 1 can provide force relief and buffering, and when the battery pole assembly is subjected to longitudinal downward external force, the upper fixing member 4 can provide force relief and buffering, thereby further enhancing the strength of the part of the battery pole assembly that bears the longitudinal external force, and further improving the longitudinal anti-loosening structural strength and torque bearing capacity of the battery pole assembly.

[0079] like Fig.11 As shown, the step surface formed between the first radial segment 4a1 and the second radial segment 4a2 of the upper fixing member 4 is defined as the first step surface B. It can be seen that the lower end of the first knurled sealing structure extends to the first step surface B, that is, the lower end of the first knurled sealing structure and the first step surface B are connected as a whole, which can enhance the structural strength of the first knurled sealing structure.

[0080] Similarly, the step surface formed between the first connecting section 11 and the second connecting section 12 is defined as the second step surface C. After assembly, the first step surface B and the second step surface C fit each other, and the lower end of the second knurled sealing structure extends to the second step surface C, that is, the lower end of the second knurled sealing structure and the second step surface C are connected as a whole, which can enhance the structural strength of the second knurled sealing structure.

[0081] In practice, the upper fixing member 4 is injection molded, so Fig.11 It can be seen that the peripheral wall of the upper limit portion 111 and the inner wall of the first diameter section 4a1 fit each other, achieving seamless engagement of the upper fixing member 4 and the pole member 1, thereby enhancing the structural strength of the battery pole assembly.

[0082] Please continue to refer to Figure 11-Figure 12 , Fig.12 for Figure 1 A transverse cross-sectional view of the engagement of the knurled seal structure in a battery pole assembly.

[0083] In this embodiment, the height of the first diameter section 4a1 and the first connecting section 11 is H1, the height of the knurled sealing structure A is H2, and the value range of H2 is: 1 / 2H1<H2<4 / 5H2.

[0084] Meanwhile, the depth of the protrusion of the knurled sealing structure A is D1, the maximum width of the protrusion of the knurled sealing structure A is W1, and the value range of D1 is: D1≥2 / 3W1.

[0085] By limiting the size of the knurled sealing structure A as above, the lateral bite sealing strength between the pole piece 1 and the upper fixing piece 4 can be enhanced, thereby increasing the force relief buffering strength when subjected to lateral torque force, thereby ensuring the lateral anti-loosening structural strength and torque bearing capacity of the battery pole assembly.

[0086] In addition, by Fig.12 It can be seen that in the knurled sealing structure A of this embodiment, the cross-section of the protrusion is trapezoidal, and the width of the protrusion gradually increases in the direction approaching the root, and a groove is formed between two adjacent protrusions. The cross-section of the groove is also trapezoidal, and the width of the groove gradually decreases from the open end to the closed end.

[0087] Since the upper fixing part 4 is actually formed by injection molding, the width of the groove at the open end is increased, which is conducive to the injection of injection liquid into the groove, ensuring that the two knurled sealing structures A can be seamlessly engaged; at the same time, the width of the protrusion gradually increases in the direction close to the root, which is also conducive to improving the circumferential connection strength of the battery pole assembly and enhancing the battery pole assembly's ability to stop rotation and withstand torque in the lateral direction under external forces.

[0088] Of course, in practical applications, the cross-sections of the protrusions and grooves are not limited to the above embodiments. For example, the cross-sections of the protrusions and grooves may be square, or the contours of the cross-sections of the protrusions and grooves may be curves.

[0089] Depend on Fig.10 It can be seen that in this embodiment, the protrusion of the knurled sealing structure A is a linear structure, that is, the axis of the protrusion is a straight line. In practice, it is also feasible that the axis of the protrusion is a curve, which can also achieve the above-mentioned anti-rotation function.

[0090] Please refer to Fig.13 , Fig.13 for Figure 6 Longitudinal cross-section of the top cover sheet.

[0091] It can be seen that, in this embodiment, the longitudinal height of the protrusion 6 and the groove portion 3b is H3, the longitudinal height of the limiting tooth 52 and the limiting groove 3a is H4, and H3>H4.

[0092] As configured above, when the battery pole assembly is subjected to a longitudinal external force torque, the first bearing structure formed by the protrusion 6 and the groove portion 3b, and the second bearing structure formed by the limiting teeth 52 and the limiting groove 3a can disperse the force release buffer, avoid the upper fixing member 4 and the top cover plate 3 being subjected to force on the same horizontal plane, increase the range of the upper fixing member 4 and the top cover plate 3 in the longitudinal force release bearing position, and thereby enhance the overall anti-rotation and anti-loosening structural strength of the battery pole assembly, and enhance the torque bearing capacity.

[0093] Of course, in practice, it is also feasible that the longitudinal height of the protrusion 6 and the groove 3b is less than the longitudinal height of the limiting tooth 52 and the limiting groove 3a, that is, H3<H4. In other words, as long as H3≠H4, the above-mentioned dispersed force buffering can be achieved.

[0094] Please refer to Fig.14 , Fig.14 for Figure 7 A partial enlarged view of the middle limit groove.

[0095] In this embodiment, the width of the entrance end of the limiting groove 3a is L1, and the width of the end of the limiting groove 3a is L2, L1<L2, that is, the limiting groove 3a is a dovetail groove structure, and the limiting tooth 52 is a dovetail tooth structure.

[0096] In this way, the matching structure of the dovetail tooth and the dovetail groove can not only realize circumferential load-bearing, but also radial load-bearing.

[0097] Depend on Figure 7 It can be seen that in this embodiment, eight limiting teeth 52 are rotationally symmetrically arranged on the outer circumference of the annular protrusion 51, and the number of limiting grooves 3a is consistent with the number of limiting teeth 52. Of course, in practical applications, the number of limiting teeth 52 and limiting grooves 3a is not limited as long as sufficient bearing strength can be ensured.

[0098] At the same time, by Fig.14 It can be seen that the corners of the limiting groove 3a are rounded to ensure that the plastic liquid fills the limiting groove 3a when the limiting tooth 52 is injected, and there is no gap in the corner injection, so as to achieve seamless engagement between the limiting tooth 52 and the limiting groove 3a.

[0099] In addition, by Figure 7 It can be seen that the plurality of limiting teeth 52 are preferably evenly distributed along the circumferential direction, that is, the plurality of limiting teeth 52 are rotationally symmetrically arranged. In this way, each limiting tooth 52 can evenly disperse the lateral external force torque on the battery pole assembly, prevent the concentrated force from causing the battery pole assembly to collapse and fail, and improve the torque bearing capacity of the battery pole assembly.

[0100] Similarly, in this embodiment, the number of the protrusions 6 and the grooves 3 b is four, and the protrusions 6 and the grooves 3 b are evenly distributed along the circumferential direction, that is, the protrusions 6 and the grooves 3 b are rotationally symmetrically arranged.

[0101] In this way, each protrusion 6 and groove portion 3b can evenly disperse the lateral external force torque on the battery pole assembly, prevent the concentration of force from causing the battery pole assembly to collapse and fail, and improve the torque bearing capacity of the battery pole assembly.

[0102] In practice, there is no limit to the number of the protrusions 6 and the grooves 3 b as long as sufficient bearing strength can be ensured.

[0103] Please refer to Fig.13 and Fig.15 , Fig.15 for Figure 3 A partial enlarged view of the mating point of the protrusion and the groove.

[0104] In this embodiment, a guide port 3c is further provided at the open end of the groove portion 3b. The guide port 3c and the groove portion 3b are connected. The width of the guide port 3c is L3, and the width of the open end of the groove portion 3b is L4, where L3>L4.

[0105] In this way, the open end of the groove portion 3b is provided with a wide-mouth structure, which facilitates the injection of the injection liquid into the groove portion 3b during injection molding, thereby achieving seamless engagement of the protrusion 6 and the groove portion 3b.

[0106] Please continue to refer to Figure 3 , Figure 8 and Fig.13 In order to ensure the reliable sealing of the battery pole assembly and prevent the battery cell from leaking, the battery pole assembly of the utility model further includes a sealing ring 7. The specific installation position of the sealing ring 7 is:

[0107] The pole piece 1 includes a fourth connecting section 14 connected to the lower end of the third connecting section 13, and a third step surface D facing the upper end is formed between the third connecting section 13 and the fourth connecting section 14. The lower side wall of the top cover sheet 3 is provided with an annular notch 3d, and the annular notch 3d is radially connected to the pole hole of the top cover sheet 3.

[0108] The pole hole of the lower fixing member 2 includes a third diameter section and a fourth diameter section connected from top to bottom. The third connecting section 13 is located inside the pole hole of the third diameter section and the top cover sheet 3. The diameter of the third diameter section is greater than the diameter of the third connecting section 13.

[0109] The inner circumferential wall of the sealing ring 7 fits with the circumferential wall of the third connecting section 13, the outer circumferential wall of the sealing ring 7 fits with the inner circumferential wall of the third radial section and the circumferential wall of the annular notch 3d, the upper side wall of the sealing ring 7 fits with the end wall of the annular notch 3d, and the lower side wall of the sealing ring 7 fits with the third step surface D.

[0110] As configured above, the sealing ring 7 can achieve circumferential sealing between the top cover sheet 3 and the pole piece 1, and between the lower fixing piece 2 and the pole piece 1, thereby ensuring reliable sealing of the battery pole assembly and preventing problems such as leakage of the battery cell.

[0111] The material of the sealing ring 7 includes but is not limited to rubber.

[0112] In addition, the sealing ring 7 is not limited to the above installation method. For example, it is also feasible that the lower side wall of the top cover sheet 3 is not provided with the annular notch 3d. In this case, the upper side wall of the sealing ring 7 fits with the lower side wall of the top cover sheet 3, the lower side wall of the sealing ring 7 fits with the third step surface D, and the sealing ring 7 is located between the inner peripheral wall of the third diameter section 2a and the outer peripheral wall of the third connecting section 13. Alternatively, the diameter of the third diameter section 2a can be equal to the diameter of the third connecting section 13. In this case, the sealing ring 7 is located inside the annular notch 3d, the inner peripheral wall of the sealing ring 7 fits with the peripheral wall of the third connecting section 13, the outer peripheral wall of the sealing ring 7 fits with the peripheral wall of the annular notch 3d, the lower side wall of the sealing ring 7 fits with the upper side wall of the lower fixing member 2, and the upper side wall of the sealing ring 7 fits with the end wall of the annular notch 3d.

[0113] Furthermore, if Figure 3 As shown, in this embodiment, a fourth step surface E is formed between the third radial segment and the fourth radial segment, the fourth connecting segment 14 is partially located inside the fourth radial segment, the third step surface D and the fourth step surface E are in contact with each other, the fourth connecting segment 14 is a square structure, the fourth radial segment is a square hole structure, and the fourth connecting segment 14 and the fourth radial segment are connected along a circumferential limit direction to achieve anti-rotation of the lower fixing member 2.

[0114] Of course, in practical applications, the structures of the fourth connecting segment 14 and the fourth diameter segment are not limited to the above-mentioned embodiments, as long as circumferential limitation can be achieved. For example, the fourth connecting segment 14 can also be a pentagonal structure, and the fourth diameter segment can also be a matching pentagonal hole structure.

[0115] like Figure 3 As shown, in this embodiment, the fitting surfaces of the lower fixing member 2 and the top cover sheet 3 are a two-level stepped structure, and gradually rise from the outside to the inside, thereby enhancing the torque bearing capacity of the battery pole assembly under external forces in the lateral direction.

[0116] As mentioned above, in the present invention, the lower fixing member 2 and the upper fixing member 4 are both injection molded parts, and the battery pole assembly adopts the injection molding assembly process, and the specific molding process is as follows:

[0117] First, the lower fixing part 2 is made by injection molding, and the pole part 1, the lower fixing part 2, the top cover sheet 3 and the sealing ring 7 are assembled together, and then the upper fixing part 4 is made by injection molding, and the upper fixing part 4 is assembled with other structures at the same time, so as to form a finished product of the battery pole assembly.

[0118] It can be seen that the battery pole assembly has a simple assembly process, high assembly automation, and a high finished product molding rate.

[0119] Among them, when assembling the pole member 1, the lower fixing member 2, the top cover sheet 3 and the sealing ring 7, the sealing ring 7 can be firstly installed on the corresponding position of the pole member 1, the lower fixing member 2 and the top cover sheet 3 can be accurately fitted, and then the pole member 1 can be passed from bottom to top through the pole hole O of the lower fixing member 2 and the top cover sheet 3 to complete the installation of the four; or, the pole member 1 can be first passed through the pole hole O of the lower fixing member 2, and then the sealing ring 7 and the top cover sheet 1 can be inserted in sequence to complete the installation of the four.

[0120] In practice, both the battery positive column assembly and the battery negative column assembly can adopt the structural form of the above-mentioned battery column assembly. Figure 2 It can be seen that the battery positive electrode column assembly and the battery negative electrode column assembly share the same top cover sheet 3 and lower fixing member 2 .

[0121] The above is a detailed introduction to a battery pole assembly provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A battery pole assembly, It is characterized in that It includes a pole piece and a connecting assembly, wherein the connecting assembly includes a lower fixing piece, a top cover sheet and an upper fixing piece which are sequentially arranged from bottom to top, and the three are correspondingly provided with pole holes, and the pole piece passes through the corresponding pole hole and is axially limited and clamped with the connecting assembly; The pole hole wall of the upper fixing member and the peripheral wall of the pole member are correspondingly provided with knurled sealing structures distributed along the circumferential direction, wherein a protrusion of one knurled sealing structure and a groove of another knurled sealing structure are correspondingly engaged; One of the top cover sheet and the opposite side wall of the upper fixing member is provided with an annular protrusion, and the outer periphery of the annular protrusion is provided with a limiting tooth, and the other has a limiting groove, and the limiting groove passes through the corresponding pole hole wall, the annular protrusion is inserted into the pole hole of the other, and the limiting tooth is clamped in the corresponding limiting groove; One of the opposite side walls of the top cover sheet and the upper fixing member is provided with a groove portion, the width of which gradually decreases from the closed end to the open end, and the other is provided with a protrusion portion matching the groove portion, the protrusion portion and the groove portion are plug-fitted together, and the protrusion portion and the groove portion are located on the periphery of the limiting tooth and the limiting groove.

2. The battery pole assembly according to claim 1, It is characterized in that The pole piece includes a first connecting section, a second connecting section and a third connecting section connected in sequence from top to bottom, the second connecting section has the smallest diameter, the pole hole of the upper fixing piece includes a first diameter section and a second diameter section connected in sequence from top to bottom, the inner diameter of the second diameter section is equal to the outer diameter of the second connecting section, The second connecting section and the second diameter section are plug-fitted together, the first connecting section and the first diameter section are plug-fitted together, and the knurled sealing structure is arranged on the relative peripheral walls of the first diameter section and the first connecting section.

3. The battery pole assembly according to claim 2, It is characterized in that The knurled sealing structure disposed on the inner wall of the first diameter section is a first knurled sealing structure, and the knurled sealing structure disposed on the peripheral wall of the first connecting section is a second knurled sealing structure. There is a distance between the upper end of the first knurled sealing structure and the upper end wall of the upper fixing member, the first connecting section forms an upper limit portion at the upper end of the second knurled sealing structure, the upper end of the second knurled sealing structure and the lower end wall of the upper limit portion are connected as a whole, and the lower end wall of the upper limit portion is in contact with the upper end wall of the first knurled sealing structure.

4. The battery pole assembly according to claim 3, It is characterized in that The height of the first diameter section and the first connecting section is H1, the height of the knurled sealing structure is H2, and the value range of H2 is: 1 / 2H1<H2<4 / 5H2; The depth of the protrusion of the knurled sealing structure is D1, the maximum width of the protrusion of the knurled sealing structure is W1, and the value range of D1 is: D1≥2 / 3W1.

5. The battery pole assembly according to claim 1, It is characterized in that The longitudinal height of the protruding portion and the groove portion is H3, the longitudinal height of the limiting tooth and the limiting groove is H4, and H3≠H4.

6. The battery pole assembly according to claim 1, It is characterized in that The width of the limiting groove entrance end is L1, and the width of the limiting groove end end is L2, L1<L2; And / or, the corners of the limiting teeth and the limiting grooves are rounded.

7. The battery pole assembly according to claim 1, It is characterized in that The opening end of the groove portion is further provided with a guide port, the guide port and the groove portion are connected, the width of the guide port is L3, the width of the opening end of the groove portion is L4, and L3>L4; And / or, there are multiple protrusions and multiple grooves, and the multiple protrusions are arranged rotationally symmetrically, and the multiple grooves are arranged rotationally symmetrically; And / or, there are multiple limiting teeth and multiple limiting grooves, and the multiple limiting teeth are rotationally symmetrically arranged, and the multiple limiting grooves are rotationally symmetrically arranged.

8. The battery pole assembly according to claim 2, It is characterized in that It also includes a sealing ring, the inner circumferential wall of the sealing ring is sealed to the circumferential wall of the pole piece, and the outer circumferential wall of the sealing ring is sealed to at least part of the pole hole wall of the lower fixing piece; and / or the inner circumferential wall of the sealing ring is sealed to the circumferential wall of the pole piece, and the outer circumferential wall of the sealing ring is sealed to at least part of the pole hole wall of the top cover sheet.

9. The battery pole assembly according to claim 8, It is characterized in that The pole piece also includes a fourth connecting section connected to the lower end of the third connecting section, a third step surface facing the upper end is formed between the third connecting section and the fourth connecting section, an annular notch is provided on the lower side wall of the top cover sheet, and the annular notch is radially connected to the pole hole of the top cover sheet, The pole hole of the lower fixing member includes a third diameter section and a fourth diameter section connected from top to bottom, the third connecting section is located inside the third diameter section and the pole hole of the top cover sheet, and the diameter of the third diameter section is greater than the diameter of the third connecting section. The inner circumferential wall of the sealing ring fits with the circumferential wall of the third connecting section, the outer circumferential wall of the sealing ring fits with the inner circumferential wall of the third diameter section and the circumferential wall of the annular notch, the upper side wall of the sealing ring fits with the end wall of the annular notch, and the lower side wall of the sealing ring fits with the third step surface.

10. The battery pole assembly according to claim 9, It is characterized in that A fourth step surface is formed between the third diameter segment and the fourth diameter segment, the fourth connecting segment is partially located inside the fourth diameter segment, the third step surface and the fourth step surface are in contact with each other, and the fourth connecting segment and the fourth diameter segment are limited in the circumferential direction; And / or, the fitting surfaces of the lower fixing member and the top cover sheet are in a two-step structure and gradually rise from the outside to the inside.

11. The battery pole assembly according to any one of claims 1 to 10, It is characterized in that The lower fixing part and the upper fixing part are both injection molded parts, and the battery pole assembly is assembled using an injection molding process.

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