Cover plate assembly, shell assembly and battery

Abstract

The utility model discloses a cover plate assembly, a shell assembly and a battery. The cover plate assembly comprises a cover plate, a pole, a snap spring and a fixed block, the cover plate is provided with a pole column hole, and the pole column penetrates through the pole column hole from one side of the cover plate and extends to the other side of the cover plate; the clamp spring is clamped on the pole; the fixing block is connected to the clamping spring in a sleeving mode. And one end, far away from the fixed block, of the pole column is used for being connected with a tab of a battery cell. The tab does not need to be bent in the link of sealing the cover plate, so that the problem of short circuit caused by insertion of the tab can be effectively avoided, and safety accidents are further prevented. Meanwhile, according to the cover plate assembly, the height of a structural part is reduced, so that the distance between the cover plate and the battery cell is reduced, the space for accommodating the pole piece is increased, and the energy density of the battery is finally improved. Meanwhile, when the clamping spring surrounds the column body and is clamped into the clamping spring groove, the fixing block can better press the clamping spring on the column body, and the connection reliability between the column body and the cover plate assembly is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of battery, especially a cover plate assembly, a shell assembly and a battery. BACKGROUND

[0002] With the rapid development of mobile devices, electric vehicles, and renewable energy storage systems, the demand for high-performance lithium batteries is increasing. Energy density, as one of the key indicators of battery performance, directly affects the endurance and overall efficiency of the device. Therefore, the market is constantly pursuing to improve the energy density of lithium batteries to meet the demand of more extensive applications.

[0003] There are various methods to improve the energy density of lithium batteries, including but not limited to improving electrode materials, optimizing electrolyte formulations, and using new types of separator technology. Among them, reducing the volume occupied by the battery structure is also an effective method. In the existing technical solution, the reduction of the structure space may cause the tab to be inserted into the pole core after bending, which not only affects the performance of the battery, but also may cause internal short circuit, and even cause battery damage or safety accidents in severe cases. SUMMARY

[0004] The utility model provides a cover plate assembly, a shell assembly and a battery to solve the problem of easy safety accidents caused by the existing battery structure reduction scheme.

[0005] Specifically, the utility model provides a cover plate assembly, which comprises a cover plate, a pole, a snap spring and a fixed block. The cover plate is provided with a pole hole. The pole extends from one side of the cover plate to the other side of the cover plate through the pole hole. The snap spring is connected to the pole and located on one side of the cover plate. The projection of the outer edge of the snap spring on the cover plate is located on the outer periphery of the pole hole. The fixed block is sleeved on the snap spring. The end of the pole away from the fixed block is used to connect the tab of the battery cell.

[0006] Optionally, the pole comprises a stop sheet and a column body arranged on the stop sheet. The stop sheet is used to connect the tab of the battery cell. The stop sheet and the fixed block are located on both sides of the cover plate. The projection of the outer edge of the stop sheet on the cover plate is located on the outer periphery of the pole hole.

[0007] Optionally, the cover plate assembly further comprises a first insulating ring and a second insulating ring. The first insulating ring and the second insulating ring are both sleeved on the column body. The first insulating ring is located between the stop sheet and the cover plate. The second insulating ring is located between the fixed block and the cover plate.

[0008] Optionally, the second insulating ring comprises a first segment, a second segment and a third segment. The second segment is connected between the first segment and the third segment.

[0009] The first section extends into the pole hole and is located between the pole and the pole hole; the second section is located between the fixing block and the cover plate; and the third section is sleeved on the fixing block.

[0010] Optionally, the pole has a cross section of a rounded rectangle, and a circlip groove is arranged on the circumference of the pole.

[0011] The circlip comprises two symmetrical half-ring-shaped clamping members, and the two half-ring-shaped clamping members are combined to form a ring-shaped structure matching the inner wall profile of the circlip groove.

[0012] Optionally, the pole has a positioning hole and two stretching holes at an end away from the stop sheet, the stretching holes are symmetrically distributed on two sides of the positioning hole, and the stretching holes and the positioning hole are arranged along the length direction of the rounded rectangle.

[0013] Optionally, the inner wall of the fixing block is provided with an annular groove, and the circlip is embedded in the annular groove.

[0014] The utility model also provides a shell assembly which comprises a shell and the cover plate assembly according to any one of the above, one end of the shell is provided with an opening, and the cover plate covers the opening; and the fixing block is located on the side of the cover plate away from the shell.

[0015] The utility model also provides a battery which comprises a cell and the shell assembly as above, the cell is arranged in the shell, the tab of the cell is electrically connected with the pole, the connection part of the tab and the pole is parallel to the end surface of the cell, and the pole faces the opening.

[0016] Optionally, the pole comprises a stop sheet and a pole body arranged on the stop sheet, the stop sheet and the fixing block are located on two sides of the cover plate; and the tab is welded on the stop sheet.

[0017] The utility model has the advantages that:

[0018] The cover plate assembly, the shell assembly and the battery have the advantages that: the tab is connected with the pole first and then is bent, so that the tab does not need to be bent in the process of covering the cover plate, thus the short circuit problem caused by the insertion of the tab can be effectively avoided, and the occurrence of safety accidents can be prevented. Meanwhile, the height of the structure of the cover plate assembly is reduced, the distance between the cover plate and the cell is reduced, the space for accommodating the pole piece is increased, and the energy density of the battery is improved. Meanwhile, when the circlip surrounds the pole body and is clamped into the circlip groove, the fixing block can better press the circlip on the pole body, and the connection reliability between the pole body and the cover plate assembly is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor under the premise of the drawings.

[0020] Figure 1 is a schematic partial cross-sectional view of a battery in an embodiment of the present application;

[0021] Figure 2 is a schematic partial structure view of a battery in an embodiment of the present application;

[0022] Figure 3 is a schematic partial structure view of a battery in an embodiment of the present application;

[0023] Figure 4 is a schematic partial structure view of a battery in an embodiment of the present application;

[0024] Figure 5 is a schematic structure view of a battery in an embodiment of the present application.

[0025] In the figure: 100, cover plate, 110, pole hole, 200, pole, 210, stop piece, 220, cylinder, 221, clamp spring groove, 222, positioning hole, 223, stretching hole, 300, clamp spring, 400, fixed block, 410, annular groove, 500, battery cell, 510, tab, 610, first insulating ring, 620, second insulating ring, 621, first section, 622, second section, 623, third section, 700, shell. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical schemes and beneficial effects solved by the present application more clearly understood, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0027] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0028] In the description of the utility model, it should be explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] Figure 1 It is the schematic partial sectional view of the battery in an embodiment of the utility model, as shown in Figure 1 , and referring to Figures 2 to 5 , the utility model embodiment provides a cover plate assembly, which comprises a cover plate 100, a pole 200, a snap spring 300 and a fixed block 400;The pole hole 110 is arranged on the cover plate 100, the pole 200 extends to the other side of the cover plate 100 from one side of the cover plate 100 through the pole hole 110, and is located on one side of the cover plate 100, the projection of the outer edge of the snap spring 300 on the cover plate 100 is located on the periphery of the pole hole 110;The snap spring 300 is clamped on the pole 200;The fixed block 400 is sleeved on the snap spring 300;The end of the pole 200 away from the fixed block 400 is used for connecting the tab 510 of the battery cell 500.

[0030] The utility model in the application, first, the tab 510 of the battery cell 500 and the pole 200 are welded together, and the tab 510 is bent, so that the height direction of the pole 200 is the same as the length direction of the battery cell 500, then the pole 200 is inserted into the pole hole 110 from one side of the cover plate 100, so that the both ends of the pole 200 are located on both sides of the cover plate 100. Subsequently, the snap spring 300 is clamped on the pole 200, so that the pole 200 is stably fixed on the cover plate 100.

[0031] This invention eliminates the need for bending the tabs 510 during the sealing process by connecting the tabs to the terminals before bending them. This effectively avoids short circuits caused by the insertion of the tabs 510, thus preventing safety accidents. Simultaneously, the reduced height of the cover assembly shortens the distance between the cover 100 and the cell 500, increasing the space for accommodating the electrode sheets and ultimately improving the battery's energy density. Furthermore, when the retaining spring 300 surrounds the column 220 and engages with the retaining spring groove 221, the fixing block 400 effectively presses the retaining spring 300 firmly onto the column 220, improving the reliability of the connection between the column 220 and the cover assembly.

[0032] In one embodiment of this utility model, the terminal post 200 includes a stop plate 210 and a post 220 disposed on the stop plate 210. The stop plate 210 is used to connect the tab 510 of the battery cell 500. The stop plate 210 and the fixing block 400 are located on both sides of the cover plate 100, and the projection of the outer edge of the stop plate 210 on the cover plate 100 is located on the outer periphery of the terminal post hole 111. The stop plate 210 is part of the terminal post 200 and can be welded to the tab 510 of the battery cell 500. This welding connection method can provide a more stable electrical and mechanical connection. Compared with some other connection methods, such as simple plug-in or crimping, welding can ensure that the contact resistance between the terminal post 200 and the tab 510 is smaller during current conduction, reducing heat generation and energy loss caused by poor contact, and improving the energy conversion efficiency during battery charging and discharging. Furthermore, the retaining ring 300 and the stop plate 210 work together to firmly fix the column 220 to the cover plate 100. The elastic properties of the retaining ring 300 allow it to tightly wrap around a specific part of the column 220, while the stop plate 210 limits the column 220 from the other side. This double fixing method can effectively prevent the column 220 from shaking or shifting during use. It should be noted that the terminal 200 connected to the positive electrode tab 510 of the battery cell 500 is called the positive terminal 200, and the terminal 200 connected to the negative electrode tab 510 of the battery cell 500 is called the negative terminal 200.

[0033] In an embodiment of the utility model, the cover plate assembly further includes a first insulating ring 610 and a second insulating ring 620, the first insulating ring 610 and the second insulating ring 620 are sleeved on the column 220, the first insulating ring 610 is located between the stop sheet 210 and the cover plate 100, and the second insulating ring 620 is located between the fixed block 400 and the cover plate 100. In the battery operation process, the current in the battery cell 500 is transmitted through the conductive path such as the pole lug 510 and the pole column 200. The existence of the first insulating ring 610 and the second insulating ring 620 can effectively isolate the electrical contact between the column 220 and the cover plate 100. Even in some special cases, such as slight displacement of the column 220 due to external vibration, or slight deformation of the cover plate 100 in the long-term use process, the insulating ring can ensure that the column 220 does not directly contact the cover plate 100, thereby avoiding the occurrence of short circuit phenomenon, and improving the safety and reliability of the battery.

[0034] Further, the second insulating ring 620 includes a first section 621, a second section 622 and a third section 623, the second section 622 is connected between the first section 621 and the third section 623, the first section 621 extends into the pole hole 110 and is located between the column 220 and the pole hole 110, the second section 622 is located between the fixed block 400 and the cover plate 100, and the third section 623 is sleeved on the fixed block 400.

[0035] In this embodiment, the second insulating ring 620 is divided into a first section 621, a second section 622 and a third section 623, and this segmented structure can provide more accurate insulation protection for different positions. The first section 621 extends into the pole hole 110 and is located between the pole column 200 and the pole hole 110, which can effectively prevent the possible electrical short circuit of the pole column 200 and the cover plate 100 at the position of the pole hole 110. In the battery operation process, especially in the working environment of high voltage and large current, the insulation of this part is crucial. Under the protection of the first section 621 insulating ring, even if the pole column 200 slightly shakes or displaces during use, the electrical insulation between the pole column 200 and the pole hole 110 can be ensured, and safety accidents caused by short circuit, such as battery heating, burning and even explosion, etc. can be avoided. The second section 622 is located between the fixed block 400 and the cover plate 100, and the third section 623 is sleeved on the fixed block 400. This multi-layer insulating ring arrangement forms a more rigorous insulating barrier. When the current is transmitted in the pole column 200, the multi-layer insulating ring can further prevent the current from leaking to the cover plate 100 and other components that do not need to be conductive, ensuring the accuracy and stability of the current path inside the battery, and improving the charging and discharging efficiency of the battery.

[0036] In an embodiment of the utility model, the number of the electric core 500 is one. In an alternative embodiment of the utility model, the number of the electric core 500 is multiple, multiple electric core 500 is in parallel arrangement, and all with the stop sheet 210 is connected. Specifically, as shown in Figure 2 The number of the electric core 500 is two, two electric core 500 is in parallel arrangement, and the positive pole lug 510 of two electric core 500 is connected together and is welded with the positive pole post 200, and the negative pole lug 510 of two electric core 500 is connected together and is welded with the negative pole post 200.

[0037] In an embodiment of the utility model, the cross section of the column 220 is rounded rectangle, and the circumferential direction of the column 220 is provided with the snap spring slot 221, and the snap spring 300 is clamped in the snap spring slot 221;The snap spring 300 includes two symmetrical half-ring clamping pieces, and the two half-ring clamping pieces are spliced to form a ring structure matched with the inner wall profile of the snap spring slot 221. The snap spring 300 includes two symmetrical half-ring clamping pieces, and the two half-ring clamping pieces are spliced to form a ring structure matched with the inner wall profile of the snap spring slot 221, so that the snap spring 300 and the inner wall of the snap spring slot 221 can be closely fitted. This close cooperation can effectively prevent the column 220 from rotating or radially displacing during use, greatly improve the connection strength between the column 220 and the cover plate assembly, and ensure that the connection between the pole 200 and the cover plate 100 is still firm and reliable when the battery is subjected to vibration, impact and other external forces.

[0038] As shown in Figure 3 、 Figure 4 In an embodiment of the utility model, the end of the column 220 away from the stop sheet 210 is provided with a positioning hole 222 and two stretch holes 223, and the stretch holes 223 are symmetrically distributed on the two sides of the positioning hole 222;The stretch hole 223 and the positioning hole 222 are arranged along the length direction of the rounded rectangle. The positioning hole 222 and the stretch hole 223 are all blind holes. In the process of assembling the battery, when the column 220 is inserted into the cover plate assembly, the positioning hole 222 can be accurately matched with other positioning components, so that the column 220 can be quickly and accurately installed to the specified position, and the efficiency and quality of the battery assembly are improved.

[0039] In an embodiment of the utility model, the inner wall of the fixed block 400 is provided with an annular groove 410, and the snap spring 300 is embedded in the annular groove 410. The annular groove 410 provides a special accommodating space for the snap spring 300, so that the snap spring 300 can be accurately installed in the fixed block 400. During the use of the battery, when the pole 200 is subjected to external force (such as vibration, impact, etc.), the snap spring 300 is limited in the annular groove 410 and is not easy to displace in the radial or axial direction. This stable installation mode ensures that the snap spring 300 can continuously and effectively play its role of fixing and connecting the pole 200, and reduces the risk of loose connection of the pole 200 caused by displacement of the snap spring 300.

[0040] The utility model embodiment further provides a shell assembly, including shell body 700 and the cover plate assembly according to any one of the above embodiments to have all effects of cover plate assembly. At least one end of shell body 700 is provided with an opening, and the cover plate 100 covers the opening. The fixed block 400 is located on the side of the cover plate 100 away from the shell body 700.

[0041] The utility model embodiment further provides a battery, including electric core 500 and the shell assembly as above, and the electric core 500 is arranged in the shell body 700. The tab 510 of the electric core 500 is electrically connected with the pole 200. The connection between the tab 510 and the pole 200 is parallel to the end surface of the electric core 510. The pole 200 faces the opening. Further, the pole 200 includes a stop sheet 210 and a column 220 arranged on the stop sheet 210. The stop sheet 210 and the fixed block 400 are located on both sides of the cover plate 100. The tab 510 is welded on the stop sheet 210.

[0042] As Figures 2 to 5As shown, in the assembling process, the positive electrode tabs 510 of the two battery cells 500 are welded to the stopper 210 of the positive electrode post 200 after being connected together, and the negative electrode tabs 510 of the two battery cells 500 are welded to the stopper 210 of the negative electrode post 200 after being connected together, then the tabs are bent so that the height direction of the post 200 is the same as the length direction of the battery cell 500. Subsequently, the first insulating ring 610 is sleeved on the post body 220 of the post 200, and the battery cell 500 is loaded into the shell 700, the post hole 110 on the cover plate 100 is aligned with the post body 220 of the post 200, the post body 220 is slowly inserted into the post hole 110 from one side of the cover plate 100, and the cover plate 100 is welded with the shell 700. Then, the second insulating ring 620 is sleeved on the post body 220 of the post 200 on the side of the cover plate 100 away from the battery cell 500. The snap spring 300 is opened to a certain extent, and then it is sleeved on the post body 220 outside the cover plate 100, so that the snap spring 300 is clamped into the snap spring slot 221 on the post 200. The fixing block 400 is sleeved on the snap spring 300, so that the aluminum block is in close contact with the snap spring 300.

[0043] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A cover assembly, characterized by The cover plate, the pole, the snap spring and the fixing block are included. The pole hole is arranged on the cover plate. The pole extends from one side of the cover plate to the other side of the cover plate through the pole hole. The snap spring is clamped on the pole and located on one side of the cover plate. The projection of the outer edge of the snap spring on the cover plate is located on the outer periphery of the pole hole. The fixing block is sleeved on the snap spring. The end of the pole away from the fixing block is used for connecting the tab of the battery cell.

2. The cover plate assembly of claim 1, wherein, The pole includes the stop sheet and the column arranged on the stop sheet. The stop sheet is used for connecting the tab of the battery cell. The stop sheet and the fixing block are located on both sides of the cover plate. The projection of the outer edge of the stop sheet on the cover plate is located on the outer periphery of the pole hole.

3. The cover plate assembly of claim 2, wherein, The cover plate assembly further includes the first insulating ring and the second insulating ring. The first insulating ring and the second insulating ring are both sleeved on the column. The first insulating ring is located between the stop sheet and the cover plate. The second insulating ring is located between the fixing block and the cover plate.

4. The cover plate assembly of claim 3, wherein, The second insulating ring includes the first section, the second section and the third section. The second section is connected between the first section and the third section. The first section extends into the pole hole and is located between the column and the pole hole. The second section is located between the fixing block and the cover plate. The third section is sleeved on the fixing block.

5. The cover plate assembly of claim 2, wherein, The cross section of the column is a rounded rectangle. The snap spring slot is arranged on the circumference of the column. The snap spring is clamped in the snap spring slot. The snap spring includes two symmetrical half-ring clamping pieces. The two half-ring clamping pieces form a ring structure matching the inner wall profile of the snap spring slot after splicing.

6. The cover plate assembly of claim 5, wherein, The end of the column away from the stop sheet is provided with a positioning hole and two stretching holes. The stretching holes are symmetrically distributed on both sides of the positioning hole. The stretching holes and the positioning hole are arranged along the length direction of the rounded rectangle.

7. The cover plate assembly of claim 1, wherein, The inner wall of the fixing block is provided with an annular groove. The snap spring is embedded in the annular groove.

8. A housing assembly characterized by, The shell and the cover plate assembly according to any one of claims 1 to 7 are included. At least one end of the shell is provided with an opening. The cover plate covers the opening. The fixing block is located on the side of the cover plate away from the shell.

9. A battery, characterized by The shell assembly according to claim 8 and the battery cell are included. The battery cell is arranged in the shell. The tab of the battery cell is electrically connected with the pole. The connection between the tab and the pole is parallel to the end surface of the battery cell. The pole faces the opening.

10. The battery of claim 9, wherein, The pole includes the stop sheet and the column arranged on the stop sheet. The stop sheet and the fixing block are located on both sides of the cover plate. The tab is welded on the stop sheet.

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