Shell part of cylindrical battery, cylindrical battery and battery module
By setting up an insulating belt and an insulating boss on the bus disk, the bus zone is distributed in a gradient manner, and the connection method between the bus disk and the pole ear is optimized, the problems of large resistance, low energy density and poor safety of the cylindrical battery are solved, and higher space utilization and welding reliability are achieved.
Patent Information
- Application Number
- CN202422140022.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-08-30
AI Technical Summary
The design of existing cylindrical batteries has problems such as large cell resistance, low energy density, low space utilization, complex welding, high defect rate and poor safety, especially in the design of positive and negative pole bus disks.
The bus disk is separated into two independent areas with an insulating tape, an insulating boss and a conductive handle are set up, and the bus zone is distributed in a gradient to adapt to the thickness difference of the extreme ears. The connection between the bus disk and the extreme ears is optimized through an asymmetric design to enhance the insulation effect and welding reliability.
It improves the space utilization and energy density of the battery, shortens the electronic path, enhances the safety and welding reliability of the battery, and reduces the risk of short circuits.
Smart Images
Figure CN223167559U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of batteries and relates to a housing part of a cylindrical battery, a cylindrical battery and a battery module. Background Art
[0002] In the field of chemical batteries, cylindrical batteries have attracted much attention due to their standardized sizes and characteristics facilitating large-scale production. Traditional cylindrical batteries usually adopt a design in which a small uncoated area is reserved at the end of the coated electrode sheet to weld a single electrode tab. However, this design results in a relatively large resistance of the battery core, thereby limiting the power density of the battery core. At the same time, the relatively high mass proportion of the small battery core housing part also reduces its energy density.
[0003] In order to improve the power density and energy density of cylindrical battery cores, making them in larger sizes and adopting a multi-electrode tab or full-electrode tab design has become an important direction. Nevertheless, there are still many problems in the prior art. On the one hand, current collectors need to be welded at both the positive and negative ends, which not only wastes space, reduces the energy density of a single battery cell, but also makes electrons pass through a relatively long path from the positive terminal to the negative terminal, increasing the resistance. In addition, the development of battery technology also needs to comprehensively consider performance parameters such as energy density, cycle life, discharge capacity, charge and discharge rate, as well as the safety of the battery.
[0004] To overcome these drawbacks, there is a technical attempt to place the positive and negative electrode tabs on the same end face of the wound core and separate and weld the positive and negative current collectors through an insulating sheet. Although this method improves the space utilization rate and shortens the electron path, there are still problems such as limited width of the current collector, increased cost due to complex design, and poor welding. In addition, the positive and negative current collectors are prone to lap together due to the vibration or collision of a single battery cell, resulting in an internal short circuit of the battery cell and even serious consequences such as fire and explosion. Summary of the Utility Model
[0005] In view of this, the purpose of the utility model is to provide a housing part of a cylindrical battery, a cylindrical battery and a battery module, and improve the energy density and safety of the cylindrical battery by optimizing the structural arrangement relationship of the housing part.
[0006] To achieve the above purpose, the utility model provides a housing part of a cylindrical battery. The housing part is a cylinder body, which has a top cover and a bottom cover. The top cover includes a current collector matching with the electrode tab of the cylindrical battery, and a cover plate folded and buckled on the current collector. A pole post is installed on the cover plate.
[0007] An insulating tape is provided on the bus bar, and the insulating tape divides the bus bar into a first bus bar area and a second bus bar area that are electrically connected to the two pole tabs of the cylindrical battery respectively. A conductive handle extending outward from the bus bar is provided at the edge of the first bus bar area or the second bus bar area, and the conductive handle is electrically connected to the pole post of the top cover. The cover plate is buckled on the bus bar by bending the conductive handle; at least one insulating boss is provided on the surface of the cover plate facing the bus bar.
[0008] Optionally, the edge of the first bus bar area or the second bus bar area is folded upward to form a folded edge that cooperates with the inner wall of the housing part, and an assembly ring groove that cooperates with the edge of the housing part is provided at the edge of the cover plate.
[0009] Optionally, a plurality of notches are provided on the folded edge of the first bus bar area or the second bus bar area.
[0010] Optionally, the insulating boss is configured such that after the cover plate is buckled on the bus bar, the projection of the insulating boss on the bus bar intersects both the first bus bar area and the second bus bar area.
[0011] Optionally, the first bus bar area and the second bus bar area are gradient-distributed on the bus bar, and the insulating tape forms a slope transition therebetween; the height difference between the first bus bar area and the second bus bar area matches the thickness difference between the two pole tabs of the cylindrical battery.
[0012] Optionally, the first bus bar area covers the positive pole tab or the negative pole tab of the cylindrical battery, and the second bus bar area covers the negative pole tab or the positive pole tab of the cylindrical battery; the area of the bus bar area covering the positive pole tab ≥ the area of the bus bar area covering the negative pole tab.
[0013] The present utility model also provides a cylindrical battery, including the above-mentioned housing part.
[0014] The winding core of the cylindrical battery is installed inside the housing part. At one end of the winding core close to the top cover, first and second pole tabs with opposite electric polarities are led out. The first bus bar area of the bus bar is electrically connected to the first pole tab and covers the first pole tab, and the second bus bar area of the bus bar is electrically connected to the second pole tab and covers the second pole tab; the pole post of the cylindrical battery is insulatingly installed on the cover plate.
[0015] Optionally, the first pole tab is the positive pole tab, the second pole tab is the negative pole tab, the first bus bar is the positive bus bar, the second bus bar is the negative bus bar, and the conductive handle is provided on the negative bus bar.
[0016] Optionally, the first pole tab is the negative pole tab, the second pole tab is the positive pole tab, the first bus bar is the negative bus bar, the second bus bar is the positive bus bar, and the conductive handle is provided on the negative bus bar.
[0017] Optionally, the area of the first bus bar area ≥ the area of the second bus bar area.
[0018] The present utility model also provides a battery module, which includes the above-mentioned cylindrical battery, and a plurality of cylindrical batteries are connected in series and / or in parallel with each other.
[0019] The beneficial effects of the present utility model are as follows:
[0020] The top cover of the housing part of the present utility model includes a current collecting plate that cooperates with the pole ears of the cylindrical battery, and a cover plate that is folded and fastened to the current collecting plate. The current collecting plate is provided with a first current collecting area and a second current collecting area that are electrically connected to the positive pole ear and the negative pole ear of the cylindrical battery, so that the housing part can be adapted to the cylindrical battery with all pole ears at the same end, thereby improving the space utilization rate, shortening the electronic path, and increasing the discharge rate of the battery cell.
[0021] The insulating tape provided between the first current collecting area and the second current collecting area can effectively prevent short circuits between the positive and negative poles, improving the safety of the battery. At the same time, the setting of the insulating boss further enhances the insulating effect. When the cover plate is fastened to the current collecting plate, the projection of the insulating boss on the current collecting plate simultaneously covers part of the first current collecting area and part of the second current collecting area, effectively preventing short circuits from occurring between the first current collecting area and the second current collecting area after fastening, and also being able to reduce the risk of local short circuits caused by unevenness or impurities on the surface of the current collecting plate.
[0022] Furthermore, the first current collecting area and the second current collecting area are distributed in a gradient on the current collecting plate, and the insulating tape forms a slope transition between them. This design enables the current collecting plate to better adapt to the thickness difference between the positive and negative pole ears, ensuring close contact between the current collecting plate and the pole ears and improving the reliability of welding. At the same time, the positive and negative current collecting plates adopt an asymmetric design, that is, the negative current collecting plate is welded to the pole column through the connection part, and the positive current collecting plate is welded to the housing through the side wall. In addition, the notch design on the side of the positive current collecting plate not only facilitates stress release after welding with the housing, but also improves the reliability of the peripheral welding. It can be seen that the present utility model improves the space utilization efficiency by optimizing the spatial layout of the current collecting plate and the top cover, thereby increasing the energy density of the battery, while also improving the welding reliability and enhancing the battery safety.
[0023] Other advantages, objectives, and features of the present utility model will be described to some extent in the subsequent description, and to some extent, they will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to make the objectives, technical solutions, and advantages of the present utility model clearer, the present utility model will be described in detail and preferably with reference to the accompanying drawings, where:
[0025] Figure 1Top view of the housing part of the cylindrical battery provided by the present utility model;
[0026] Figure 2 Side view of the housing part of the cylindrical battery provided by the present utility model;
[0027] Figure 3 Exploded view in one direction after the housing part of the cylindrical battery provided by the present utility model is assembled with the cylindrical battery;
[0028] Figure 4 Exploded view in another direction after the housing part of the cylindrical battery provided by the present utility model is assembled with the cylindrical battery.
[0029] Reference numerals:
[0030] 100 - housing part; 110 - top cover; 111 - cover plate; 111.1 - insulating boss; 111.2 - assembly ring groove; 112 - current collector plate; 112.1 - first current collection area; 112.2 - second current collection area; 112.3 - conductive handle; 112.4 - hem; 112.5 - notch; 112.6 - insulating tape; 120 - bottom cover; 200 - wound core; 300 - first tab; 400 - second tab; 500 - terminal post. Detailed implementation manners
[0031] The following illustrates the implementation manners of the present utility model through specific examples. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present utility model in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.
[0032] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to the present utility model; in order to better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.
[0033] In the drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation of the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.
[0034] As Figures 1 to 4 shown, the present utility model provides a housing member 100 of a cylindrical battery as follows. The housing member 100 is designed as a cylindrical structure and is equipped with a top cover 110 and a bottom cover 120. The innovative design of the top cover 110 lies in that it includes a current collecting plate 112 that matches the tabs of the cylindrical battery, and a cover plate 111 that is tightly buckled on the current collecting plate 112 by folding. A pole column 500 is also fixedly installed on the cover plate 111. An insulating tape 112.6 is provided on the current collecting plate 112. The insulating tape 112.6 divides the current collecting plate 112 into two independent regions - a first current collecting region 112.1 and a second current collecting region 112.2. The first current collecting region 112.1 and the second current collecting region 112.2 are respectively electrically connected to the positive tab and the negative tab of the cylindrical battery.
[0035] A conductive handle 112.3 extending outward from the current collecting plate 112 is particularly provided at the edge of the first current collecting region 112.1 or the second current collecting region 112.2. The conductive handle 112.3 forms a stable electrical connection with the pole column 500 of the top cover 110. By bending the conductive handle 112.3, the cover plate 111 can be buckled with the current collecting plate 112. To ensure the insulation effect, at least one insulating boss 111.1 is also provided on the surface of the cover plate 111 facing the current collecting plate 112. When the cover plate 111 is buckled, the projection of the insulating boss 111.1 on the current collecting plate 112 can cover part of the first current collecting region 112.1 and part of the second current collecting region 112.2 at the same time. This design effectively prevents short circuits between the positive and negative electrodes after buckling and reduces the risk of local short circuits caused by uneven surfaces or impurities on the current collecting plate 112.
[0036] In addition, considering the thickness difference between the positive and negative tabs of the cylindrical battery, the first current collecting area 112.1 and the second current collecting area 112.2 are gradient-distributed on the current collecting plate 112 to adapt to the thickness difference between the positive and negative tabs of the cylindrical battery. The height difference between the first current collecting area 112.1 and the second current collecting area 112.2 matches the thickness difference between the positive tab and the negative tab to ensure close contact between the current collecting plate 112 and the tab, thereby reducing the welding difficulty between the current collecting area and the tab and improving the welding effect. An insulating tape 112.6 is used to form a slope transition between the first current collecting area 112.1 and the second current collecting area 112.2, enabling the current collecting plate 112 to better adapt to the thickness difference between the positive and negative tabs, ensuring close contact between the current collecting plate 112 and the tab, and thus improving the welding reliability. At the same time, the area of the current collecting area covering the positive tab ≥ the area of the current collecting area covering the negative tab. This asymmetric design not only optimizes the current distribution but also effectively improves the energy density and safety of the battery.
[0037] Furthermore, the edge of the first current collecting area 112.1 or the second current collecting area 112.2 is turned up to form a folded edge 112.4 that fits the inner wall of the housing part 100. The folded edge 112.4 is welded to the inner wall of the housing part 100 to complete the connection between the housing part 100 and the current collecting plate 112. The edge of the cover plate 111 is also provided with an assembly ring groove 111.2 that matches the edge of the housing part 100, improving the convenience and tightness of the overall assembly. In addition, a plurality of notches 112.5 can be opened on the folded edge 112.4 of the first current collecting area 112.1 or the second current collecting area 112.2 to facilitate stress release after welding to the housing, thereby significantly improving the welding reliability between the periphery of the current collecting plate 112 and the inner wall of the housing part 100.
[0038] The present utility model also provides a cylindrical battery including the above-mentioned housing part 100. The winding core 200 of the cylindrical battery is installed inside the housing part 100, and the first tab 300 and the second tab 400 with opposite electric polarities are led out from one end close to the top cover 110. The first current collecting area 112.1 on the current collecting plate 112 is electrically connected to and covers the first tab 300, and the second current collecting area 112.2 is electrically connected to and covers the second tab 400. The pole column 500 of the cylindrical battery is installed on the cover plate 111 in an insulating manner.
[0039] In some optional embodiments, the first tab 300 is a positive tab, the second tab 400 is a negative tab. Correspondingly, the first current collecting plate 112 serves as a positive current collecting plate, the second current collecting plate 112 serves as a negative current collecting plate, and the conductive handle 112.3 is provided on the negative current collecting plate. The edge of the first current collecting plate 112 is provided with a bend, and a plurality of notches 112.5 are opened thereon.
[0040] The first tab 300 of the cylindrical battery uses an aluminum material as the current collector, and the second tab 400 uses a copper material as the current collector, such that the thickness of the first tab 300, which serves as the positive tab, ≥ the second tab 400, which serves as the negative tab. Correspondingly, the height of the first current collecting region 112.1 ≥ the height of the second current collecting region 112.2, and the height difference between the first current collecting region 112.1 and the second current collecting region 112.2 is equal to the thickness difference between the first tab 300 and the second tab 400. Since the conductivity of the copper material is better than that of the aluminum material, the area of the first current collecting region 112.1 is designed to be ≥ the area of the second current collecting region 112.2, improving the conductivity of the first current collecting region 112.1 and the utilization efficiency of the material, thereby optimizing the current distribution and battery performance. To further improve the balance of the positive and negative current collection, the area of the first tab 300 covered by the first current collecting region 112.1 ≥ the area of the second tab 400 covered by the second current collecting region 112.2.
[0041] In this embodiment, the assembly steps of the cylindrical battery and the housing member 100 are as follows:
[0042] S1. Weld the first current collecting region 112.1 and the second current collecting region 112.2 to the first tab 300 and the second tab 400 of the core 200 respectively.
[0043] S2. Insert the core 200 into the housing 100 at a certain angle, and use laser circumferential welding to weld the folded edge 112.4 of the current collecting plate 112 to the inner wall of the housing member 100.
[0044] S3. Bend the conductive handle 112.3 to make the cover plate 111 snap onto the current collecting plate 112, and use laser circumferential welding to weld the cover plate 111 to the edge of the housing member 100.
[0045] S4. Inject electrolyte and perform sealing nail welding to complete the assembly of the single cylindrical battery.
[0046] The present utility model also provides a battery module, including the above-mentioned cylindrical battery, and a battery module is formed by connecting a plurality of cylindrical batteries in series and / or in parallel.
[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions, and they should all be covered within the scope of the claims of the present utility model.
Claims
1. A housing component of a cylindrical battery, the housing component (100) being a cylinder with a top cover (110) and a bottom cover (120), characterized in that: The top cover (110) includes a busbar (112) that matches the tabs of the cylindrical battery, and a cover plate (111) that is folded and fastened to the busbar (112), with a pole (500) mounted on the cover plate (111); An insulating tape (112.6) is provided on the busbar (112), and the insulating tape (112.6) separates the busbar (112) into a first busbar area (112.1) and a second busbar area (112.2) electrically connected to the two pole tabs of the cylindrical battery respectively. A conductive handle (112.3) extending outward from the busbar (112) is provided on the edge of the first busbar area (112.1) or the second busbar area (112.2). The conductive handle (112.3) is electrically connected to the pole (500) of the top cover (110). The cover plate (111) is buckled onto the busbar (112) by bending the conductive handle (112.3); wherein, At least one insulating boss (111.1) is provided on the surface of the cover plate (111) facing the busbar (112).
2. The housing according to claim 1, wherein: The edge of the first confluence area (112.1) or the second confluence area (112.2) is folded upward to form a folded edge (112.4) that matches the inner wall of the shell member (100), and the edge of the cover plate (111) is provided with an assembly ring groove (111.2) that matches the edge of the shell member (100).
3. The housing member according to claim 2, wherein: A plurality of notches (112.5) are provided on the folded edge (112.4) of the first confluence area (112.1) or the second confluence area (112.2).
4. The housing member according to claim 1, wherein: The insulating boss (111.1) is configured such that, after the cover plate (111) is buckled onto the busbar (112), a projection of the insulating boss (111.1) on the busbar (112) intersects with both the first busbar area (112.1) and the second busbar area (112.2).
5. The housing according to claim 1, wherein: The first bus region (112.1) and the second bus region (112.2) are distributed in a gradient manner on the bus plate (112), and the insulating strip (112.6) forms a slope transition between the first bus region (112.1) and the second bus region (112.2); and the height difference between the first bus region (112.1) and the second bus region (112.2) matches the thickness difference between the two pole ears of the cylindrical battery.
6. The housing member according to claim 1, wherein: The first busbar area (112.1) covers the positive electrode ear or the negative electrode ear of the cylindrical battery, and the second busbar area (112.2) covers the negative electrode ear or the positive electrode ear of the cylindrical battery; the area of the busbar area covering the positive electrode ear is greater than or equal to the area of the busbar area covering the negative electrode ear.
7. A cylindrical battery, characterized in that: Comprising a housing member as described in any one of claims 1 to 6; the winding core (200) of the cylindrical battery is installed inside the housing member (100), and electrically opposite first and second tab ears (300, 400) are led out from one end of the winding core (200) close to the top cover (110). The first current collecting area (112.1) of the current collecting plate (112) is electrically connected to the first tab ear (300) and covers the first tab ear (300), and the second current collecting area (112.2) of the current collecting plate (112) is electrically connected to the second tab ear (400) and covers the second tab ear (400); the pole column (500) of the cylindrical battery is installed on the cover plate (111) in an insulated manner.
8. The cylindrical battery according to claim 7, characterized in that: The first tab ear (300) is a positive tab ear, the second tab ear (400) is a negative tab ear, the current collecting plate (112) comprises a first current collecting plate and a second current collecting plate, the first current collecting plate is a positive current collecting plate, the second current collecting plate is a negative current collecting plate, and the conductive handle (112.3) is arranged on the negative current collecting plate.
9. The cylindrical battery according to claim 8, wherein: The area of the first current collecting area (112.1) ≥ the area of the second current collecting area (112.2).
10. A battery module, characterized in that: Comprising a plurality of cylindrical batteries as described in any one of claims 7 to 9, and the plurality of cylindrical batteries are connected in series and / or in parallel with each other.