End cover assembly and battery

Abstract

The utility model relates to the technical field of batteries, and provides an end cover assembly and a battery. Wherein the end cover assembly comprises a cover plate and a lower insulation structure, the cover plate is provided with a first mounting hole and a second mounting hole which are both used for mounting a pole, the lower insulation structure comprises a positive electrode insulation part and a negative electrode insulation part which are arranged at an interval and are both mounted on the bottom surface of the cover plate, and the positive electrode insulation part is provided with a first through hole corresponding to the first mounting hole; the anode insulator is provided with a first through hole corresponding to the first mounting hole, the cathode insulator is provided with a second through hole corresponding to the second mounting hole, the first through hole and the second through hole are used for allowing the pole to pass through, one end, close to the cathode insulator, of the anode insulator is provided with a first weight reduction groove, and / or one end, close to the anode insulator, of the cathode insulator is provided with a second weight reduction groove. The lower insulation structure is designed into a split type structure, so that the assembly difficulty of the end cover assembly is reduced, and the air tightness of the end cover assembly is improved.

Description

Technical Field

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

[0002] Generally, a battery includes an end cap assembly, a shell and a battery cell. The battery cell is installed in the shell. The end cap assembly includes a cover plate and a lower insulating structure (also called lower plastic). The cover plate is sealed and connected to an end of the shell with an opening so that the battery cell is in a closed space. The lower insulating structure is arranged on the bottom surface of the cover plate, that is, on the surface of the cover plate facing the battery cell. The lower insulating structure is an injection molded part and mainly plays an insulating role to prevent the cover plate from being charged.

[0003] In the existing technology, please combine Figure 1 , the lower insulating structure 20 is provided with a first through hole 213 and a second through hole 223, and the cover plate 10 is provided with a first mounting hole 11 and a second mounting hole 13, the first through hole 213 is provided corresponding to the first mounting hole 11, and the second through hole 223 is provided corresponding to the second mounting hole 13. The first mounting hole 11 and the second mounting hole 13 are respectively used to accommodate the positive pole and the negative pole, wherein the pole passes through the through hole of the lower insulating structure 20 and is installed in the mounting hole of the cover plate 10. However, in the existing lower insulating structure 20, the center distance between the first through hole 213 and the second through hole 223 is difficult to control, which easily leads to the center distance between the two being inconsistent with the center distance between the first mounting hole 11 and the second mounting hole 13, which increases the difficulty of assembling the end cover assembly and reduces the air tightness of the end cover assembly. Utility Model Content

[0004] The utility model aims to provide an end cover assembly and a battery, aiming to solve the technical problems of the existing end cover assembly being difficult to assemble and having low air tightness.

[0005] In a first aspect, the present application provides an end cover assembly, including a cover plate and a lower insulating structure, the cover plate is provided with a first mounting hole and a second mounting hole both for mounting a pole, the lower insulating structure includes a positive pole insulating member and a negative pole insulating member which are arranged at intervals and both mounted on the bottom surface of the cover plate, the positive pole insulating member is provided with a first through hole corresponding to the first mounting hole, the negative pole insulating member is provided with a second through hole corresponding to the second mounting hole, the first through hole and the second through hole are both used for allowing the pole to pass through, wherein a first weight-reducing groove is provided at one end of the positive pole insulating member close to the negative pole insulating member, and / or a second weight-reducing groove is provided at one end of the negative pole insulating member close to the positive pole insulating member.

[0006] The beneficial effect of the end cap assembly provided by the utility model is that the lower insulating structure in the prior art is an integral injection molding, and the lower insulating structure after molding is easy to shrink, resulting in a change in the center distance between the first through hole and the second through hole, which makes it difficult for the lower insulating structure to be assembled with the cover plate. In the present application, the lower insulating structure is a split structure, which includes two separately injection-molded positive electrode insulating parts and negative electrode insulating parts, so that the positive electrode insulating parts can be installed separately on the cover plate, and the negative electrode insulating parts can be installed separately on the cover plate, which is conducive to reducing the assembly difficulty of the end cap assembly and improving the air tightness of the end cap assembly. Moreover, compared with the existing integral structure, the split structure of the present application has a reduced weight and volume of the lower insulating structure, which can reduce the production cost. In addition, by providing a first weight-reducing groove on the positive electrode insulating part and / or providing a second weight-reducing groove on the negative electrode insulating part, the space occupancy rate of the end cap assembly is reduced while reducing the production cost, so that the battery using the end cap assembly has more space to accommodate or avoid other substances.

[0007] Optionally, the first weight-reducing groove runs through the upper and lower surfaces of the positive electrode insulating member.

[0008] Optionally, the second weight-reducing groove runs through the upper and lower surfaces of the negative electrode insulating member.

[0009] Optionally, the first weight-reducing groove is in a trapezoidal or arched shape.

[0010] Optionally, the second weight-reducing groove is in a trapezoidal or arched shape.

[0011] Optionally, the shape of the first weight-reducing groove is different from the shape of the second weight-reducing groove.

[0012] Optionally, a first mounting groove surrounding the first mounting hole is formed on the bottom surface of the cover plate, and the positive electrode insulating member includes a first main body and a first boss arranged on the top surface of the first main body, the first main body is in a sheet shape, the first boss is installed in the first mounting groove, and the first through hole is formed on the top surface of the first boss and passes through the bottom surface of the first main body.

[0013] Optionally, a second mounting groove surrounding the second mounting hole is formed on the bottom surface of the cover plate, and the negative electrode insulating member includes a second main body and a second boss arranged on the top surface of the second main body, the second main body is in a sheet shape, the second boss is installed in the second mounting groove, and the second through hole is formed on the top surface of the second boss and passes through to the bottom surface of the second main body.

[0014] Optionally, the cover plate is provided with an explosion-proof structure, and the lower insulating structure also includes a breathable insulating component arranged on the bottom surface of the cover plate, the breathable insulating component covers the explosion-proof structure, and the breathable insulating component is provided with a plurality of air holes for gas to flow to the explosion-proof structure, and the positive insulating component, the negative insulating component and the breathable insulating component are arranged at intervals.

[0015] Optionally, a ventilation groove is provided on the top surface of the breathable insulating member, all the ventilation holes are connected to the ventilation groove, and the ventilation groove surrounds the explosion-proof structure.

[0016] Optionally, the top surface of the air-permeable insulating member is provided with at least one first positioning structure, and the bottom surface of the cover plate is provided with at least one second positioning structure for plugging and matching with the first positioning structure.

[0017] Optionally, at least one of the positive electrode insulating member, the negative electrode insulating member and the air-permeable insulating member is made of PP material.

[0018] Optionally, the thickness of the positive electrode insulating member is 0.5-2 mm.

[0019] Optionally, the thickness of the negative electrode insulating member is 0.5-2 mm.

[0020] Optionally, the thickness of the air-permeable insulating member is 1 to 3 mm.

[0021] Optionally, the positive electrode insulating member is provided with a first identification portion.

[0022] Optionally, the negative electrode insulating member is provided with a second identification portion.

[0023] In the second aspect, the present application provides a battery, comprising a shell, a battery cell, a packaging film, a positive electrode connecting piece, a negative electrode connecting piece and the above-mentioned end cover assembly, the battery cell is accommodated in the shell, and has a positive electrode ear and a negative electrode ear, the positive electrode insulating member and the negative electrode insulating member are both hot-melt connected to the packaging film, the packaging film is used to encapsulate the battery cell, the positive electrode connecting piece is located between the packaging film and the battery cell, and is electrically connected to the positive electrode ear, the negative electrode connecting piece is located between the packaging film and the battery cell, and is electrically connected to the negative electrode ear, and the cover plate is sealed and connected to the shell.

[0024] The battery provided by the utility model has the beneficial effect that: due to the adoption of the end cover assembly, the production efficiency of the battery is improved, and the production cost of the battery is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 An exploded view of an end cover assembly in the prior art;

[0027] Figure 2 An exploded view of an end cover assembly provided in an embodiment of the utility model;

[0028] Figure 3 Another exploded view of the end cover assembly provided by the embodiment of the utility model;

[0029] Figure 4 A schematic diagram of the structure of the cover plate provided in the embodiment of the utility model;

[0030] Figure 5 A schematic diagram of the structure of a breathable insulating member provided in an embodiment of the utility model;

[0031] Figure 6 A cross-sectional view of a battery (housing and battery cells omitted) provided in an embodiment of the utility model;

[0032] Figure 7 for Figure 6 A magnified view of middle;

[0033] Figure 8 A schematic diagram of the structure of the positive electrode connecting piece provided in an embodiment of the utility model;

[0034] Fig. 9 A schematic structural diagram of a negative electrode connecting piece provided in an embodiment of the utility model.

[0035] Among them, the reference numerals in the figure are:

[0036] 100. end cover assembly; 10. cover plate; 20. lower insulation structure;

[0037] 30. Positive pole; 40. Negative pole; 50. Explosion-proof structure;

[0038] 11. First mounting hole; 12. First mounting slot; 13. Second mounting hole;

[0039] 14. Second mounting groove; 15. Liquid injection hole; 16. Second positioning structure;

[0040] 21. Positive electrode insulating member; 22. Negative electrode insulating member; 23. Breathable insulating member;

[0041] 211. first body; 212. first boss; 213. first through hole;

[0042] 214, first weight-reducing groove; 221, second main body; 222, second boss;

[0043] 223, second through hole; 224, second weight-reducing groove; 231, air vent;

[0044] 232, ventilation groove; 233, first positioning structure; 200, battery;

[0045] 210. Positive electrode connecting piece; 220. Negative electrode connecting piece; 230. Packaging film. DETAILED DESCRIPTION

[0046] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0047] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0048] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Please refer to Figures 1 to 9 Now, the end cover assembly 100 and the battery 200 in the embodiment of the utility model are described.

[0052] Please refer to Figure 2 and Figure 3The end cap assembly 100 provided in the present application includes a cover plate 10 and a lower insulating structure 20, the cover plate 10 is provided with a first mounting hole 11 and a second mounting hole 13 both for mounting a pole, the lower insulating structure 20 includes a positive pole insulator 21 and a negative pole insulator 22 which are arranged at intervals and both mounted on the bottom surface of the cover plate 10, the positive pole insulator 21 is provided with a first through hole 213 corresponding to the first mounting hole 11, the negative pole insulator 22 is provided with a second through hole 223 corresponding to the second mounting hole 13, the first through hole 213 and the second through hole 223 are both used for the pole to pass through, wherein a first weight-reducing groove 214 is provided at one end of the positive pole insulator 21 close to the negative pole insulator 22, and / or a second weight-reducing groove 224 is provided at one end of the negative pole insulator 22 close to the positive pole insulator 21.

[0053] Specifically, the first mounting hole 11 and the second mounting hole 13 are arranged at intervals, and both extend in the up-down direction and penetrate the upper and lower surfaces of the cover plate 10. The first through hole 213 extends in the up-down direction and penetrates the upper and lower surfaces of the positive electrode insulating member 21, and the second through hole 223 extends in the up-down direction and penetrates the upper and lower surfaces of the negative electrode insulating member 22. Among them, the thickness direction of the cover plate 10, the thickness direction of the positive electrode insulating member 21, and the thickness direction of the negative electrode insulating member 22 are all parallel to the up-down direction. The first weight-reducing groove 214 is opened at the right end of the positive electrode insulating member 21, and the second weight-reducing groove 224 is opened at the left end of the negative electrode insulating member 22.

[0054] Please refer to Figure 1 , the lower insulating structure 20 in the prior art is an integral injection molding, and the molded lower insulating structure 20 is prone to shrinkage, which causes the center distance between the first through hole 213 and the second through hole 223 to change, making it difficult for the lower insulating structure 20 to be assembled with the cover plate 10. In the present application, the lower insulating structure 20 is a split structure, which includes two separately injection-molded positive insulators 21 and negative insulators 22, so that the positive insulator 21 can be installed separately on the cover plate 10, and the negative insulator 22 can be installed separately on the cover plate 10, which is conducive to reducing the assembly difficulty of the end cap assembly 100 and improving the airtightness of the end cap assembly 100. Moreover, compared with the existing integral structure, the split structure of the present application reduces the weight and volume of the lower insulating structure 20, which can reduce the production cost. In addition, by setting a first weight-reducing groove 214 on the positive electrode insulating member 21, and / or setting a second weight-reducing groove 224 on the negative electrode insulating member 22, the production cost is reduced while reducing the space occupancy rate of the end cover assembly 100, so that the battery 200 using the end cover assembly 100 has more space to accommodate or avoid other substances, such as electrolyte, injection hole 15, explosion-proof structure 50, etc.

[0055] In some embodiments, please refer to Figure 2The first weight-reducing groove 214 penetrates the upper and lower surfaces of the positive electrode insulating member 21. This arrangement can further reduce production costs and reduce the space occupancy rate of the end cap assembly 100. Further, the first weight-reducing groove 214 penetrates to the right end surface of the positive electrode insulating member 21.

[0056] In some embodiments, please refer to Figure 2 The second weight-reducing groove 224 penetrates the upper and lower surfaces of the negative electrode insulating member 22. This arrangement can further reduce production costs and reduce the space occupancy rate of the end cap assembly 100. Further, the second weight-reducing groove 224 penetrates to the left end surface of the negative electrode insulating member 22.

[0057] In some embodiments, please refer to Figure 2 The shape of the first weight-reducing groove 214 is trapezoidal or arched to reduce the difficulty of production.

[0058] Similarly, in some embodiments, please refer to Figure 1 The shape of the second weight-reducing groove 224 is trapezoidal or arched.

[0059] In some embodiments, please refer to Figure 2 The shape of the first weight-reducing groove 214 is different from the shape of the second weight-reducing groove 224. For example, the shape of the first weight-reducing groove 214 is a trapezoid, and the shape of the second weight-reducing groove 224 is an arch. Such a configuration can play a foolproof role to prevent the positive electrode insulating member 21 and the negative electrode insulating member 22 from being installed in the wrong position.

[0060] In some embodiments, please refer to Figures 2 to 4 The bottom surface of the cover plate 10 is provided with a first mounting groove 12 surrounding the first mounting hole 11. The positive electrode insulating member 21 includes a first main body 211 and a first boss 212 arranged on the top surface of the first main body 211. The first main body 211 is sheet-shaped. The first boss 212 is installed in the first mounting groove 12. The first through hole 213 is provided on the top surface of the first boss 212 and penetrates to the bottom surface of the first main body 211.

[0061] Specifically, the first mounting hole 11 is located above the first mounting groove 12, and the first mounting hole 11 penetrates the upper wall of the first mounting groove 12. The first weight-reducing groove 214 is opened at one end of the first body 211 close to the negative electrode insulating member 22, and the first boss 212 is located at one end of the first body 211 away from the negative electrode insulating member 22, that is, the first boss 212 and the first weight-reducing groove 214 are respectively located at the left and right ends of the first body 211. Figure 1In order to ensure the hot-melt connection with the packaging film 230 covering the battery cell, the existing lower insulating structure 20 usually has protrusions at the left and right ends of the lower insulating structure 20. In this embodiment, the first body 211 is directly constructed into a sheet shape. Compared with the prior art, the first body 211 cancels the protrusion structure, increases the corresponding internal space of the battery cell, and is conducive to improving the capacity of the battery 200 using the end cap assembly 100.

[0062] In some embodiments, please refer to Figure 2 From right to left, the width of the first weight-reducing groove 214 gradually decreases to reduce the influence of the first weight-reducing groove 214 on the first boss 212 and ensure the overall strength of the positive electrode insulating member 21 .

[0063] In some embodiments, the cross-section of the first mounting groove 12 is rectangular, and the cross-section of the first boss 212 is also rectangular. Such a configuration can limit the rotation of the positive electrode insulating member 21 in the first mounting groove 12, which is beneficial to improving the installation accuracy of the positive electrode insulating member 21, thereby improving the production yield.

[0064] In some embodiments, please refer to Figures 2 to 4 A second mounting groove 14 surrounding the second mounting hole 13 is formed on the bottom surface of the cover plate 10. The negative electrode insulating member 22 includes a second main body 221 and a second boss 222 arranged on the top surface of the second main body 221. The second main body 221 is sheet-shaped. The second boss 222 is installed in the second mounting groove 14. The second through hole 223 is formed on the top surface of the second boss 222 and penetrates to the bottom surface of the second main body 221.

[0065] Specifically, the second mounting hole 13 is located above the second mounting groove 14, and the second mounting hole 13 penetrates to the upper wall surface of the second mounting groove 14. The second weight-reducing groove 224 is provided at one end of the second body 221 close to the positive insulator 21, and the second boss 222 is located at one end of the second body 221 away from the positive insulator 21, that is, the second weight-reducing groove 224 and the second boss 222 are respectively located at the left and right ends of the second body 221. The second body 221 is constructed in a sheet shape, which increases the corresponding internal space of the battery cell, and is conducive to improving the capacity of the battery 200 using the end cap assembly 100.

[0066] In some embodiments, please refer to Figure 2 From left to right, the width of the second weight-reducing groove 224 gradually decreases to reduce the influence of the second weight-reducing groove 224 on the second boss 222 and ensure the overall strength of the negative electrode insulating member 22 .

[0067] In some embodiments, the cross-section of the second mounting groove 14 is rectangular, and the cross-section of the second boss 222 is also rectangular. Such a configuration can limit the rotation of the negative electrode insulating member 22 in the second mounting groove 14, which is beneficial to improving the installation accuracy of the negative electrode insulating member 22, thereby improving the production yield.

[0068] In some embodiments, please refer to Figures 2 to 4 The end cap assembly 100 further includes a positive electrode column 30 and a negative electrode column 40. The positive electrode column 30 is installed in the first installation hole 11 and clamps the first body 211 together with the cover plate 10. The negative electrode column 40 is installed in the second installation hole 13 and clamps the second body 221 together with the cover plate 10. The positive electrode column 30 and the negative electrode column 40 are both insulated from the cover plate 10.

[0069] In some embodiments, please refer to Figure 2 The cover plate 10 is provided with an explosion-proof structure 50, and the lower insulating structure 20 further includes a breathable insulating member 23 provided on the bottom surface of the cover plate 10. The breathable insulating member 23 covers the explosion-proof structure 50. The breathable insulating member 23 is provided with a plurality of breathable holes 231 for gas to flow to the explosion-proof structure 50. The positive electrode insulating member 21, the negative electrode insulating member 22 and the breathable insulating member 23 are arranged at intervals. Among them, the explosion-proof structure 50 is used to release the internal pressure when the internal pressure or temperature of the battery 200 reaches a threshold value. The explosion-proof structure 50 can be, but is not limited to, a pressure relief valve, an explosion-proof valve and other structures. The explosion-proof structure 50 is a prior art, so it is not repeated here.

[0070] Specifically, the air hole 231 is opened on the bottom surface of the air-permeable insulating member 23 and penetrates the top surface of the air-permeable insulating member 23 in the up-down direction. The explosion-proof structure 50 is located between the first mounting hole 11 and the second mounting hole 13, and the air-permeable insulating member 23 is located between the positive electrode insulating member 21 and the negative electrode insulating member 22. The provision of the air-permeable insulating member 23 can prevent the explosion-proof structure 50 from being blocked by other foreign objects, so that the explosion-proof structure 50 can work normally.

[0071] In some embodiments, please refer to Figure 5 The top surface of the air-permeable insulating member 23 is provided with an air-permeable groove 232, all the air-permeable holes 231 are connected to the air-permeable groove 232, and the air-permeable groove 232 surrounds the explosion-proof structure 50. Such a configuration improves the pressure relief sensitivity of the explosion-proof structure 50 while ensuring the normal operation of the explosion-proof structure 50.

[0072] In some embodiments, please refer to Figure 4 and Figure 5The top surface of the air-permeable insulating member 23 is provided with at least one first positioning structure 233, and the bottom surface of the cover plate 10 is provided with at least one second positioning structure 16 for plugging and matching with the first positioning structure 233. The air-permeable insulating member 23 is installed on the cover plate 10 by plugging and matching, which reduces the production difficulty while ensuring the connection strength.

[0073] The present application does not specifically limit the number of the first positioning structures 233 and the number of the second positioning structures 16 , and the present application is described with the number of the first positioning structures 233 and the number of the second positioning structures 16 both being two.

[0074] In some embodiments, the two first positioning structures 233 are two plug-in grooves opened on the top surface of the breathable insulating member 23 , and the two plug-in grooves are respectively located on two opposite sides of the breathable groove 232 , and the two second positioning structures 16 are two plug-in bosses arranged on the bottom surface of the cover plate 10 .

[0075] In some embodiments, the two first positioning structures 233 are two plug-in bosses arranged on the top surface of the breathable insulating member 23 , and the two plug-in bosses are respectively located on two opposite sides of the breathable groove 232 , and the two second positioning structures 16 are two plug-in grooves opened on the bottom surface of the cover plate 10 .

[0076] In some embodiments, one of the first positioning structures 233 is a plug-in slot provided on the top surface of the air-permeable insulating member 23, and the other first positioning structure 233 is a plug-in boss provided on the top surface of the air-permeable insulating member 23. The two first positioning structures 233 are respectively located on opposite sides of the air-permeable slot 232. One of the second positioning structures 16 is a plug-in slot provided on the bottom surface of the cover plate 10, and the other second positioning structure 16 is a plug-in boss provided on the bottom surface of the cover plate 10.

[0077] It can be seen that if the number of the first positioning structures 233 is two or more, the first positioning structures 233 can be all groove structures, all boss structures, or part of them can be groove structures and the other part can be boss structures. The second positioning structure 16 is similar, as long as the first positioning structure 233 and the second positioning structure 16 can be plugged and matched, it is not limited here.

[0078] In some embodiments, at least one of the positive electrode insulating member 21, the negative electrode insulating member 22 and the air-permeable insulating member 23 is made of PP material. The price of PP material is relatively low and has good heat resistance, which is conducive to reducing production costs.

[0079] Preferably, the positive electrode insulating member 21, the negative electrode insulating member 22 and the air-permeable insulating member 23 are all made of PP material to reduce the diversity of materials and facilitate management and use.

[0080] In some embodiments, the thickness of the positive electrode insulating member 21 is 0.5-2 mm. As an example, the thickness of the positive electrode insulating member 21 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, or a range between any two of the aforementioned values.

[0081] In some embodiments, the thickness of the negative electrode insulating member 22 is 0.5-2 mm. As an example, the thickness of the negative electrode insulating member 22 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, or a range between any two of the aforementioned values.

[0082] In some embodiments, the thickness of the air-permeable insulating member 23 is 1-3 mm. As an example, the thickness of the air-permeable insulating member 23 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, or a range between any two of the aforementioned values.

[0083] Preferably, the thickness of the breathable insulating member 23 is greater than the thickness of the positive electrode insulating member 21 and the thickness of the negative electrode insulating member 22. This is because the middle portion of the top surface of the breathable insulating member 23 is hollowed out to form a breathable groove 232. As described above, the overall strength of the breathable insulating member 23 can be ensured.

[0084] In some embodiments, the positive electrode insulating member 21 is provided with a first identification portion. Specifically, the first identification portion is a first groove opened on the surface of the first body 211, and the number of the first grooves is two, and the two first grooves are perpendicular to each other to form an identifier in the shape of a "+". The first identification portion can play a foolproof role, which can further reduce the probability of the positive electrode insulating member 21 being installed in the wrong position and improve the production yield. Among them, the first groove can be set on the top surface of the first body 211, or it can be set on the bottom surface of the first body 211, which is not limited here.

[0085] In some embodiments, the negative electrode insulating member 22 is provided with a second identification portion. Specifically, the second identification portion is a second groove opened on the surface of the second body 221, the number of the second groove is one, and it is in the shape of "-". The second identification portion can play a foolproof role, which can further reduce the probability of the negative electrode insulating member 22 being installed in the wrong position and improve the production yield. Among them, the second groove can be set on the top surface of the second body 221, or it can be set on the bottom surface of the second body 221, which is not limited here.

[0086] In some embodiments, please refer to Figure 2 The cover plate 10 is also provided with a liquid injection hole 15, which penetrates the upper and lower surfaces of the cover plate 10. The liquid injection hole 15 is used for electrolyte injection, and is sealed by a sealing nail.

[0087] The present application provides an assembly method of the end cap assembly 100:

[0088] Take the positive electrode insulating member 21 , insert the first boss 212 into the first mounting groove 12 , and the positive electrode column 30 passes through the first through hole 213 and the first mounting hole 11 in sequence from the side of the positive electrode insulating member 21 away from the cover plate 10 , and the positive electrode column 30 is fixedly connected to the first mounting hole 11 .

[0089] Next, take the negative electrode insulating member 22 , insert the second boss 222 into the second mounting groove 14 , and pass the negative electrode column 40 through the second through hole 223 and the second mounting hole 13 in sequence from the side of the negative electrode insulating member 22 away from the cover plate 10 , and fix the negative electrode column 40 into the second mounting hole 13 .

[0090] Then, the air-permeable insulating member 23 is taken and installed on the bottom surface of the cover plate 10 through the first positioning structure 233 and the second positioning structure 16 .

[0091] The end cap assembly 100 of the present application is formed by assembling in this way.

[0092] Please refer to Figure 6 and Figure 7 The present application also provides a battery 200, which includes a shell, a battery cell, a packaging film 230, a positive electrode connecting piece 210, a negative electrode connecting piece 220 and the above-mentioned end cover assembly 100. The battery cell is accommodated in the shell and has a positive electrode ear and a negative electrode ear. The positive electrode insulating member 21 and the negative electrode insulating member 22 are both hot-melt connected to the packaging film 230. The packaging film 230 is used to encapsulate the battery cell and plays an insulating role. The positive electrode connecting piece 210 is located between the packaging film 230 and the battery cell and is electrically connected to the positive electrode ear. The negative electrode connecting piece 220 is located between the packaging film 230 and the battery cell and is electrically connected to the negative electrode ear. The cover plate 10 is sealed and connected to the shell.

[0093] Specifically, the bottom surface of the positive electrode connecting piece 210 is welded to the positive electrode ear, and the top surface of the positive electrode connecting piece 210 is welded to the positive electrode column 30. The bottom surface of the negative electrode connecting piece 220 is welded to the negative electrode ear, and the top surface of the negative electrode connecting piece 220 is welded to the negative electrode column 40. Four avoidance holes are opened on the packaging film 230, and the four avoidance holes all penetrate the upper and lower surfaces of the packaging film 230. The four avoidance holes are used to expose the positive electrode column 30, the negative electrode column 40, the injection hole 15 and the breathable insulating member 23 respectively. After the packaging film 230 is placed, the first body 211 is connected to the packaging film 230 by hot melting, and the second body 221 is connected to the packaging film 230. The battery cell is separated from the cover plate 10 and the shell by the packaging film 230 and the lower insulating structure 20, which can effectively prevent the cover plate 10 or the shell from being charged, thereby ensuring the safety performance of the battery 200.

[0094] Define the plane perpendicular to the up and down directions as the horizontal plane.

[0095] In some embodiments, please refer to Figure 2 and Figure 8The shape of the positive electrode connecting piece 210 is similar to that of the positive electrode insulating member 21, and the projection of the positive electrode connecting piece 210 on the horizontal plane falls within the projection of the positive electrode insulating member 21 on the horizontal plane. This arrangement effectively reduces the risk of direct contact between the positive electrode connecting piece 210 and the cover plate 10, and can further improve the safety performance of the battery 200.

[0096] In some embodiments, please refer to Figure 2 and Fig. 9 The shape of the negative electrode connecting piece 220 is similar to that of the negative electrode insulating member 22, and the projection of the negative electrode connecting piece 220 on the horizontal plane falls within the projection of the negative electrode insulating member 22 on the horizontal plane. This arrangement effectively reduces the risk of direct contact between the negative electrode connecting piece 220 and the cover plate 10, and can further improve the safety performance of the battery 200.

[0097] In some embodiments, the top surface of the positive electrode connecting sheet 210 is provided with a first rough surface, and the positive electrode connecting sheet 210 is welded to the positive electrode column 30 through the first rough surface. The first rough surface is processed by frosting or embossing, which can improve the welding strength between the positive electrode connecting sheet 210 and the positive electrode column 30.

[0098] In some embodiments, the top surface of the negative electrode connecting piece 220 is provided with a second rough surface, and the negative electrode connecting piece 220 is welded to the negative electrode column 40 through the second rough surface. The second rough surface is also processed by frosting or embossing process, which can improve the welding strength between the negative electrode connecting piece 220 and the negative electrode column 40.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An end cap assembly, characterized in that: include: The cover plate (10) is provided with a first mounting hole (11) and a second mounting hole (13) both for mounting a pole; A lower insulating structure (20), comprising a positive electrode insulating member (21) and a negative electrode insulating member (22) arranged at intervals and both mounted on the bottom surface of the cover plate (10), the positive electrode insulating member (21) being provided with a first through hole (213) corresponding to the first mounting hole (11), the negative electrode insulating member (22) being provided with a second through hole (223) corresponding to the second mounting hole (13), the first through hole (213) and the second through hole (223) both being used for allowing a pole to pass through; Wherein, a first weight-reducing groove (214) is provided at one end of the positive electrode insulating member (21) close to the negative electrode insulating member (22), and / or a second weight-reducing groove (224) is provided at one end of the negative electrode insulating member (22) close to the positive electrode insulating member (21).

2. The end cap assembly according to claim 1, characterized in that: The first weight-reducing groove (214) passes through the upper and lower surfaces of the positive electrode insulating member (21); And / or, the second weight-reducing groove (224) runs through the upper and lower surfaces of the negative electrode insulating member (22).

3. The end cap assembly according to claim 1, characterized in that: The first weight-reducing groove (214) is in a trapezoidal or arched shape; And / or, the second weight-reducing groove (224) is in a trapezoidal or arched shape.

4. The end cap assembly according to claim 1, characterized in that: The shape of the first weight-reducing groove (214) is different from the shape of the second weight-reducing groove (224).

5. The end cap assembly according to claim 1, characterized in that: The bottom surface of the cover plate (10) is provided with a first mounting groove (12) surrounding the first mounting hole (11); the positive electrode insulating member (21) comprises a first body (211) and a first boss (212) arranged on the top surface of the first body (211); the first body (211) is in a sheet shape; the first boss (212) is installed in the first mounting groove (12); the first through hole (213) is provided on the top surface of the first boss (212) and penetrates to the bottom surface of the first body (211); And / or, the bottom surface of the cover plate (10) is provided with a second mounting groove (14) surrounding the second mounting hole (13), the negative electrode insulating member (22) comprises a second main body (221) and a second boss (222) arranged on the top surface of the second main body (221), the second main body (221) is in the form of a sheet, the second boss (222) is installed in the second mounting groove (14), and the second through hole (223) is provided on the top surface of the second boss (222) and passes through to the bottom surface of the second main body (221).

6. The end cap assembly according to any one of claims 1 to 5, characterized in that: The cover plate (10) is provided with an explosion-proof structure (50), and the lower insulating structure (20) further comprises a breathable insulating member (23) arranged on the bottom surface of the cover plate (10), the breathable insulating member (23) covers the explosion-proof structure (50), and the breathable insulating member (23) is provided with a plurality of breathable holes (231) for allowing gas to flow to the explosion-proof structure (50), and the positive electrode insulating member (21), the negative electrode insulating member (22) and the breathable insulating member (23) are arranged in intervals with each other.

7. The end cap assembly according to claim 6, characterized in that: A ventilation groove (232) is provided on the top surface of the ventilation insulating member (23), all the ventilation holes (231) are connected to the ventilation groove (232), and the ventilation groove (232) is arranged to surround the explosion-proof structure (50).

8. The end cap assembly according to claim 6, characterized in that: The top surface of the air-permeable insulating member (23) is provided with at least one first positioning structure (233), and the bottom surface of the cover plate (10) is provided with at least one second positioning structure (16) for plugging and matching with the first positioning structure (233).

9. The end cap assembly according to claim 6, characterized in that: At least one of the following conditions is met: At least one of the positive electrode insulating member (21), the negative electrode insulating member (22) and the air-permeable insulating member (23) is made of PP material; The thickness of the positive electrode insulating member (21) is 0.5 to 2 mm; The thickness of the negative electrode insulating member (22) is 0.5 to 2 mm; The thickness of the air-permeable insulating member (23) is 1 to 3 mm; The positive electrode insulating member (21) is provided with a first identification portion; The negative electrode insulating member (22) is provided with a second identification portion.

10. A battery, characterized in that: The invention comprises a shell, a battery cell, a packaging film (230), a positive electrode connecting piece (210), a negative electrode connecting piece (220) and an end cap assembly (100) as claimed in any one of claims 1 to 9, wherein the battery cell is accommodated in the shell and has a positive electrode ear and a negative electrode ear, the positive electrode insulating member (21) and the negative electrode insulating member (22) are both hot-melt-connected to the packaging film (230), the packaging film (230) is used to package the battery cell, the positive electrode connecting piece (210) is located between the packaging film (230) and the battery cell and is electrically connected to the positive electrode ear, the negative electrode connecting piece (220) is located between the packaging film (230) and the battery cell and is electrically connected to the negative electrode ear, and the cover plate (10) is sealed and connected to the shell.

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