Top cover of power battery, power battery and power battery module

Abstract

The utility model discloses a top cover of a power battery, which is characterized in that the top cover comprises a top cover plate, the middle part of the top cover plate is provided with a pole mounting hole, the periphery of the pole mounting hole is provided with a protruding part protruding upwards from the upper surface of the top cover plate, and the protruding part is annular and surrounds the pole mounting hole; the protruding part is provided with a first upper surface, the first upper surface is a plane, and the first upper surface is used for installing a bar piece. According to the utility model, the protruding part which protrudes upwards is arranged on the top cover, the first upper surface of the protruding part is the plane and is used for being connected with the chip, and the height difference between the protruding part and the top cover plate can eliminate the edge covering thickness of the film sleeve, so that the chip does not need to be subjected to step treatment or other complicated treatment, the use is convenient, and in addition, due to the arrangement of the annular protruding part, the cost is reduced. In addition, due to the arrangement of the protruding part, the top cover is not prone to deformation.

Description

Technical Field

[0001] The utility model relates to the field of power batteries, and in particular to a top cover of a power battery, a power battery and a power battery module. Background Art

[0002] Currently, lithium-ion / sodium-ion cylindrical batteries are becoming a mainstream product in the new energy industry due to their high energy density, good capacity consistency, and support for high-rate charge and discharge. More and more manufacturers are pursuing cost reductions in cylindrical battery top cover structures and avoiding intellectual property and patent risks from their peers. Common problems include the following: 1. The explosion-proof valve of common cylindrical power batteries is installed on the top cover. Due to the high pressure required to release the valve when it opens, the top cover will deform as the internal pressure of the battery gradually increases, affecting the consistency of the valve opening pressure and posing a safety risk to the battery. 2. When the film sleeve is installed on the outside of the cylindrical power battery, structural stability is considered. The battery ends have a rim feature. When the module busbar is welded to the top cover, the busbar easily interferes with the rim and fits poorly, resulting in a cold weld or requiring the module to complicate the busbar structure (such as adding steps) to address the problem, which increases the module manufacturing cost. 3. As the new energy industry increasingly pursues high energy density and compact internal structures, the battery explosion-proof valve may become clogged in the exhaust channel, resulting in reduced valve opening sensitivity and posing a safety risk to the battery. Summary of the Invention

[0003] The purpose of the present utility model is to provide a top cover of a power battery, a power battery and a power battery module, so as to solve the problem in the prior art that the tabs easily interfere with the edge of the membrane sleeve and poorly fit, resulting in the occurrence of cold solder joints, or the problem that the module needs to have a complicated tab structure.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a top cover of a power battery, including a top cover plate, a pole mounting hole is provided in the middle of the top cover plate, and a protrusion protruding upward from the upper surface of the top cover plate is provided on the outer periphery of the pole mounting hole. The protrusion is annular and is arranged around the pole mounting hole. The protrusion has a first upper surface, which is a plane and is used to install a tab.

[0005] Preferably, the raised portion is provided with an explosion-proof valve hole opened toward the lower surface of the top cover plate; the inner surface of the top cover plate is provided with a recessed portion recessed toward the outer surface of the top cover plate, the recessed portion is annular and arranged around the pole mounting hole, the recessed portion is provided with an explosion-proof valve, and the explosion-proof valve is arranged corresponding to the explosion-proof valve hole.

[0006] Preferably, a pole is installed inside the pole mounting hole, and an insulating member is provided between the pole and the top cover plate, and the insulating member includes a first insulating member located below the top cover plate, the first insulating member is plate-shaped and a plurality of exhaust holes are evenly opened on the first insulating member corresponding to the recessed portion to form an exhaust channel connected to the explosion-proof valve.

[0007] Preferably, the pole includes a first pole and a second pole, the first pole is disc-shaped, and a mounting through-hole is provided in the middle of the first pole, the second pole is in an inverted T-shape, and the second pole includes a disc-shaped first sub-pole and a columnar second sub-pole provided on the first sub-pole, the first pole is installed on the upper part of the top cover plate and protrudes from the top cover plate, the first sub-pole is passed through the pole mounting hole and the mounting through-hole, and the second sub-pole is located below the top cover plate.

[0008] Preferably, an insulating hole is opened in the middle of the first insulating member, the edge of the insulating hole is a pressing portion, and the pressing portion is also provided with a limiting portion extending downward, the second sub-pole is passed through the insulating hole, the pressing portion is provided between the first sub-pole and the lower surface of the top cover plate, and the limiting portion abuts against the side wall of the first sub-pole.

[0009] Preferably, the insulating member further includes a second insulating member and a third insulating member, the second insulating member is arranged between the top cover plate and the first pole, the third insulating member is sleeved on the second sub-pole and the second insulating member is arranged between the second sub-pole and the top cover plate.

[0010] Preferably, the upper surface of the top cover plate is further provided with a downwardly recessed stepped hole, the top of the pole mounting hole is located at the bottom of the stepped hole, and the second insulating member is installed in the stepped hole.

[0011] Preferably, the distance between the upper surface of the protrusion and the upper surface of the top cover plate is greater than or equal to 0.1 mm and less than or equal to 0.6 mm.

[0012] The utility model also provides a power battery, comprising a shell and the above-mentioned power battery top cover arranged on the shell.

[0013] The present invention further provides a power battery module, comprising a plurality of the above-mentioned power batteries, wherein the outer periphery of the power battery is covered with a film sleeve, the film sleeve extends to the outer edge of the upper surface of the top cover and the film sleeve does not cover the raised portion, and the raised portion is connected to a tab.

[0014] Compared with the prior art, the present invention provides an upwardly protruding protrusion on the top cover, and the first upper surface of the protrusion is a plane for connecting the bar. The height difference between the protrusion and the top cover plate can eliminate the edging thickness of the membrane sleeve. Therefore, there is no need to perform step processing or other complicated processing on the bar, and it is easy to use. In addition, the setting of the annular protrusion is convenient for molding, and due to the setting of the protrusion, the top cover is not easy to deform. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the top cover plate at one angle according to an embodiment of the present utility model.

[0016] Figure 2 This is a structural diagram of the top cover plate from another angle of an embodiment of the utility model.

[0017] Figure 3 This is a cross-sectional structural diagram of the top cover plate of an embodiment of the present utility model.

[0018] Figure 4 This is a structural diagram of the top cover of an embodiment of the utility model from one angle.

[0019] Figure 5 This is a structural diagram of the top cover of an embodiment of the utility model from another angle.

[0020] Figure 6 This is an exploded view of the top cover of an embodiment of the present utility model.

[0021] Figure 7 This is a cross-sectional structural diagram of the top cover of an embodiment of the present utility model.

[0022] Figure 8 This is a structural diagram of a power battery according to an embodiment of the present utility model.

[0023] Figure 9 This is a structural diagram of a power battery according to an embodiment of the present invention after a film cover is provided and tabs are connected.

[0024] Figure 10 for Figure 9 Cross-sectional structural diagram. DETAILED DESCRIPTION

[0025] In order to explain the technical content, structural features and effects achieved by the present invention in detail, the following is a detailed description in conjunction with the embodiments and the accompanying drawings.

[0026] like Figures 1 to 10As shown, an embodiment of the present invention provides a top cover of a power battery, including a top cover plate 1, a pole mounting hole 11 is provided in the middle of the top cover plate 1, and a protrusion 12 protruding upward from the upper surface of the top cover plate 1 is provided on the outer periphery of the pole mounting hole 11. The protrusion 12 is annular and is arranged around the pole mounting hole 11. The protrusion 12 has a first upper surface 121, which is a plane. The first upper surface 121 is used to install the bar 40. Specifically, the power battery 100 can be a cylindrical power battery, the top cover 10 closes the upper part of the power battery 100, the distance h between the upper surface of the protrusion 12 and the upper surface of the top cover plate 1 is greater than or equal to 0.1 mm and less than or equal to 0.6 mm, the size of the first upper surface 121 corresponds to the size of the tab 40 to better weld the tab 40, when the power battery 100 is used in a battery module, the outer periphery of the power battery 100 is covered with a film sleeve 30, and the film sleeve 30 extends to the outer edge of the upper surface of the top cover 10 to form a edging 301. In addition, the annular protrusion 12 can be stamped, which is convenient to form.

[0027] In the embodiment of the present invention, an upwardly protruding protrusion 12 is provided on the top cover 10, and the first upper surface 121 of the protrusion 12 is a plane for connecting the tab 40. The height difference between the protrusion 12 and the top cover plate 1 can eliminate the thickness of the edging 301 of the membrane sleeve 30. Therefore, there is no need to perform step processing or other complicated processing on the tab 40, which is convenient to use. In addition, the setting of the annular protrusion 12 is convenient for molding, and due to the setting of the protrusion 12, the top cover 10 is not easily deformed.

[0028] In the embodiment of the present utility model, Figures 1 to 3 As shown, the raised portion 12 is provided with an explosion-proof valve hole 122 extending toward the lower surface of the top cover plate 1. The inner surface of the top cover plate 1 is provided with a recessed portion 15 recessed toward the outer surface of the top cover plate 1. The recessed portion 15 is annular and surrounds the pole mounting hole 11. The recessed portion 15 is provided with an explosion-proof valve 13, which is arranged corresponding to the explosion-proof valve hole 122. Specifically, the placement of the explosion-proof valve hole 122 on the raised portion 12 saves space and makes the power battery 100 more compact.

[0029] Furthermore, if Figures 4 to 7As shown, the pole 2 is mounted within the pole mounting hole 11. An insulating member is provided between the pole 2 and the top cover 1. The insulating member includes a first insulating member 31 positioned below the top cover 1. The first insulating member 31 is plate-shaped and has a plurality of exhaust holes 311 uniformly formed therein corresponding to the recessed portion 15, thereby forming an exhaust passageway connected to the explosion-proof valve 13. Specifically, the first insulating member 31 is made of a plastic material such as PP or PET. The insulating member ensures insulation between the pole 2 and the top cover 1, preventing short circuits. Because the recessed portion 15 is recessed toward the interior of the top cover 1, an exhaust space is created between the first insulating member 31 and the recessed portion 15. Furthermore, a plurality of exhaust holes 311 are uniformly provided on the first insulating member 31. Each of the exhaust holes 311 is connected to the explosion-proof valve 13, forming multiple exhaust passageways. This prevents the problem of reduced valve opening sensitivity of the explosion-proof valve 13 due to blockage of the exhaust passageway of the explosion-proof valve 13, which in turn poses a safety risk to the battery, as is the case with conventional power batteries 100.

[0030] In the embodiment of the present invention, the pole 2 includes a first pole 21 and a second pole 22. The first pole 21 is disc-shaped and has a mounting through-hole 211 in the middle thereof. The second pole 22 is in an inverted T-shape and includes a disc-shaped first sub-pole 221 and a columnar second sub-pole 222 disposed on the first sub-pole 221. The first pole 21 is mounted on the upper portion of the top cover plate 1 and protrudes from the top cover plate 1. The first sub-pole 221 is passed through the pole mounting hole 11 and the mounting through-hole 211. The second sub-pole 222 is located below the top cover plate 1. The arrangement of the first pole 21 and the second pole 22 facilitates the mounting of the pole 2 on the top cover plate 1.

[0031] In the embodiment of the present utility model, an insulating hole 312 is formed in the middle of the first insulating member 31. The edge of the insulating hole 312 is a pressing portion 313. The pressing portion 313 is also provided with a downwardly extending limit portion 314. The second sub-pole 222 is passed through the insulating hole 312. The pressing portion 313 is provided between the first sub-pole 221 and the lower surface of the top cover plate 1. The limit portion 314 abuts against the side wall of the first sub-pole 221. By using the first sub-pole 221 to press against the pressing portion 313 of the first insulating member 31, the first insulating member 31 is installed on the inner side of the top cover plate 1. In addition, an annular insulating rib 315 extends downward from the outer edge of the first insulating member 31. The insulating rib 315 is used to insulate the first sub-pole 221 to ensure battery performance.

[0032] In the embodiment of the present utility model, Figure 1 as well as Figures 6 and 7As shown, the insulating member also includes a second insulating member 32 and a third insulating member 33. The second insulating member 32 is arranged between the top cover plate 1 and the first pole 21. The third insulating member 33 is sleeved on the second sub-pole 222 and the second insulating member 32 is arranged between the second sub-pole 222 and the top cover plate 1. Specifically, the upper surface of the top cover plate 1 is further provided with a downwardly recessed step hole 14. The top of the pole mounting hole 11 is located at the bottom of the step hole 14. The second insulating member 32 is installed in the step hole 14, and the first pole 21 is arranged on the second insulating member 32.

[0033] In the embodiment of the present utility model, Figures 1 to 8 As shown, an embodiment of the present invention further discloses a power battery 100, comprising a housing 20 and a top cover 10 covering the power battery 100 on the housing 20. Specifically, the power battery 100 can be a cylindrical power battery 100, and the top cover 10 encloses the upper portion of the power battery 100. By providing an upwardly protruding protrusion 12 on the top cover 10, and a first upper surface 121 of the protrusion 12 is flat for connecting to the tab 40, the height difference between the protrusion 12 and the top cover plate 1 can eliminate the thickness of the edge 301 of the film sleeve 30. Therefore, there is no need to perform step processing or other complicated processing on the tab 40, and it is convenient to use.

[0034] like Figures 9 and 10 As shown, an embodiment of the present invention further discloses a power battery module 100, including the above-mentioned power battery 100. The outer periphery of the power battery 100 is covered with a film sleeve 30, which extends to the outer edge of the upper surface of the top cover 10 and does not cover the raised portion 12. A tab 40 is connected to the raised portion 12. Specifically, the tab 40 is made of aluminum. When the power battery 100 is used in a battery module, the outer periphery of the power battery 100 is covered with the film sleeve 30, which extends to the outer edge of the upper surface of the top cover 10 to form a rim 301. By providing an upwardly protruding raised portion 12 on the top cover 10, and the first upper surface 121 of the raised portion 12 is flat for connecting the tab 40, the height difference between the raised portion 12 and the top cover plate 1 can eliminate the thickness of the rim 301 of the film sleeve 30. Therefore, there is no need to perform step processing or other complicated processing on the tab 40, making it easy to use.

[0035] The above disclosure is only a preferred embodiment of the present invention and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A top cover of a power battery, characterized in that: It includes a top cover plate, a pole mounting hole is provided in the middle of the top cover plate, and a protrusion is provided on the outer periphery of the pole mounting hole, which protrudes upward from the upper surface of the top cover plate. The protrusion is annular and is arranged around the pole mounting hole. The protrusion has a first upper surface, which is a plane and is used to install a bar.

2. The top cover of the power battery according to claim 1, characterized in that: The raised portion is provided with an explosion-proof valve hole opened toward the lower surface of the top cover plate; the inner surface of the top cover plate is provided with a recessed portion recessed toward the outer surface of the top cover plate, the recessed portion is annular and arranged around the pole mounting hole, and the recessed portion is provided with an explosion-proof valve, which is arranged corresponding to the explosion-proof valve hole.

3. The top cover of the power battery according to claim 2, characterized in that: A pole is installed inside the pole mounting hole, and an insulating member is provided between the pole and the top cover plate. The insulating member includes a first insulating member located below the top cover plate. The first insulating member is plate-shaped and has a plurality of exhaust holes evenly opened on the first insulating member corresponding to the recessed portion to form an exhaust channel connected to the explosion-proof valve.

4. The top cover of the power battery according to claim 3, characterized in that: The pole includes a first pole and a second pole, the first pole is disc-shaped, and a mounting through-hole is provided in the middle of the first pole. The second pole is in an inverted T-shape, and the second pole includes a disc-shaped first sub-pole and a columnar second sub-pole provided on the first sub-pole. The first pole is installed on the upper part of the top cover plate and protrudes from the top cover plate. The first sub-pole is passed through the pole mounting hole and the mounting through-hole, and the second sub-pole is located below the top cover plate.

5. The top cover of the power battery according to claim 4, characterized in that: An insulating hole is opened in the middle of the first insulating member, the edge of the insulating hole is a pressing portion, and the pressing portion is further provided with a limiting portion extending downward. The second sub-pole is passed through the insulating hole, the pressing portion is provided between the first sub-pole and the lower surface of the top cover plate, and the limiting portion abuts against the side wall of the first sub-pole.

6. The top cover of the power battery according to claim 4, characterized in that: The insulating member further includes a second insulating member and a third insulating member, wherein the second insulating member is arranged between the top cover plate and the first pole, the third insulating member is sleeved on the second sub-pole, and the second insulating member is arranged between the second sub-pole and the top cover plate.

7. The top cover of the power battery according to claim 6, characterized in that: The upper surface of the top cover plate is further provided with a downwardly recessed step hole, the top of the pole mounting hole is located at the bottom of the step hole, and the second insulating member is installed in the step hole.

8. The top cover of the power battery according to claim 1, characterized in that: A distance between an upper surface of the protrusion and an upper surface of the top cover plate is greater than or equal to 0.1 mm and less than or equal to 0.6 mm.

9. A power battery, characterized in that: The power battery comprises a shell and a top cover according to any one of claims 1 to 8 and arranged on the shell.

10. A power battery module, characterized in that: It comprises several power batteries as described in claim 9, wherein the periphery of the power batteries is covered with a film sleeve, the film sleeve extends to the outer edge of the upper surface of the top cover and the film sleeve does not cover the raised portion, and the raised portion is connected to a tab.

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