Cell cover, battery and battery pack

Abstract

This application relates to a cell cover, a battery, and a battery pack, belonging to the technical field of batteries. The cell cover includes a cover body, a riveting block, and two terminals. The cover body has two mounting holes penetrating through it in the thickness direction. The two terminals are respectively installed into the two mounting holes in the cover body. Each terminal includes a plate portion, a column portion, and a riveting portion arranged sequentially in the thickness direction. The column portion penetrates through the mounting holes, the plate portion is located on a first side in the thickness direction of the cover body, and the riveting portion is located on a second side in the thickness direction of the cover body opposite to the first side. The riveting block is located on the second side in the thickness direction of the cover body and is riveted and fixed to the two terminals through the two riveting portions. The cross-section of the column portion perpendicular to the thickness direction of the cover body is racetrack-shaped. This increases the current-carrying area of ​​the terminals, thereby increasing the total current-carrying capacity of the terminals.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to cell covers, batteries, and battery packs. Background Technology

[0002] With the development of lithium-ion battery technology, lithium-ion batteries have achieved technological breakthroughs in high energy density and long cycle life in electric vehicles and energy storage, leading to increased demands on performance and safety. The blade battery employs a long, strip-shaped cell design, reaching lengths of over 1 meter and thicknesses of only a few centimeters, resembling a "blade." Through structural innovation, the blade battery can skip the "module" stage during assembly, significantly improving volume utilization and ultimately achieving the design goal of fitting more cells into the same space.

[0003] In summary, the blade battery has a smaller cover width and a smaller terminal rod diameter. The traditional riveted cover of the cylindrical terminal rod cannot meet the high-rate charging requirements of the battery. During the battery charging process, the structural components heat up quickly and the temperature is high, which can easily cause battery safety problems. Summary of the Invention

[0004] Based on this, it is necessary to address the technical problem of rapid and high temperature rise of structural components during battery charging, which may lead to battery overheating and runaway. This requires providing a cell cover, battery, and battery pack to ensure that the current carrying capacity of the welded part between the rivet block and the busbar is not less than the total current carrying capacity of the two terminals, while ensuring that the size of the rivet block is not too large and affects the flatness of the rivet block and other requirements.

[0005] The first aspect of the present invention provides a battery cell cover plate, including a cover plate body, a riveting block, and two pole pieces. The cover plate body has a flat structure, and the length direction, width direction, and thickness direction are defined based on the cover plate body. The cover plate body has two mounting holes that penetrate the cover plate body in the thickness direction. The two pole pieces are respectively installed in the two mounting holes of the cover plate body.

[0006] The pole includes a plate part, a column part and a riveting part arranged sequentially along the thickness direction of the cover plate body; the column part passes through the mounting hole, the plate part is located on the first side in the thickness direction of the cover plate body, and the riveting part is located on the second side in the thickness direction of the cover plate body opposite to the first side;

[0007] The rivet block is located on the second side of the thickness direction of the cover plate body and is fixed to the two poles by two rivet parts;

[0008] The cross-section of the column portion perpendicular to the thickness direction of the cover plate is racetrack shaped.

[0009] Increasing the current-carrying area of ​​the electrode increases its current-carrying capacity.

[0010] In other embodiments, the rivet block has two rivet holes that penetrate the rivet block in the thickness direction along the length of the cover plate body, and the rivet parts of the two poles are respectively riveted into the two rivet holes.

[0011] In other embodiments, the cover plate body is a plain aluminum plate, a first insulating element is provided between the riveting block and the cover plate body, a second insulating element is provided between the plate body of the two pole posts and the cover plate body, and a sealing element is provided between the inner surface of the mounting hole and the pole body.

[0012] In other embodiments, the second insulating member has two recesses on the side of the plate portion near the two poles, and the plate portions of the two poles are respectively embedded in the two recesses.

[0013] A second aspect of the present invention provides a battery comprising a housing, an electrode assembly, and a cell cover plate. The housing has a receiving space and an open opening. The electrode assembly is disposed within the receiving space. The electrode tabs of the electrode assembly are electrically connected to the plate portions of two terminals respectively. The cell cover plate is disposed at the opening of the housing.

[0014] In other embodiments, the housing has two openings located at opposite ends of the housing.

[0015] A second aspect of the present invention provides a battery pack including a plurality of batteries, wherein a riveting block is welded to a busbar on the side away from the cover body in the thickness direction of the cover body.

[0016] In other embodiments, the riveting block has two riveting holes that penetrate the riveting block in the thickness direction along the length of the cover plate body, and the weld area of ​​the busbar and the welding block is located between the two riveting holes.

[0017] In other embodiments, the welding area between the busbar and the riveting block is The area of ​​the cross-section of the column portion perpendicular to the thickness direction of the cover plate body is: , .

[0018] In other embodiments, the distance between the solder area and the two riveting holes along the length of the cover plate body is c, and the width of the solder area along the width of the cover plate body is d; the distance between the two riveting holes along the length of the cover plate body is L, and the width of the riveting block is b; the welding area between the busbar and the riveting block is... , ;

[0019] The area of ​​the cross-section of the column portion perpendicular to the thickness direction of the cover plate body is: , ;

[0020] in:

[0021] r is the radius of the semicircles at both ends of the runway shape;

[0022] m is the length of the rectangle between the two semicircles in the runway shape.

[0023] Ensure that the current carrying capacity of the welded joint block to the busbar is not less than the total current carrying capacity of the two poles, while ensuring that the size of the joint block is not too large and affects the flatness of the joint block and other requirements. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of the cell cover plate of this application.

[0025] Figure 2 for Figure 1 Top view.

[0026] Figure 3 for Figure 1 An explosion diagram.

[0027] Figure 4 This is a schematic diagram of the riveting block in this application.

[0028] Figure 5 This is a three-dimensional schematic diagram of the pole column of this application.

[0029] Figure 6 This is a top view of the pole section of this application.

[0030] Figure 7 This is a cross-sectional schematic diagram of the battery portion of this application.

[0031] Reference numerals: 100, pole post; 200, cover plate body; 300, first insulating component; 400, second insulating component; 500, riveting block; 600, sealing component; 700, pole group; 800, housing; 900, solder area;

[0032] 110. Plate section; 120. Column section; 130. Riveted section;

[0033] 210. Mounting holes;

[0034] 510. Riveting hole. Detailed Implementation

[0035] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0036] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0041] like Figures 1-7 As shown, a battery cell cover includes two terminals 100, a cover body 200, and a riveting block 500.

[0042] The cover plate body 200 has a flat structure, and the length direction, width direction and thickness direction are defined based on the cover plate body 200.

[0043] The pole post 100 includes a plate portion 110, a post portion 120, and a riveting portion 130 arranged sequentially along the thickness direction of the cover plate body 200.

[0044] In one embodiment, the plate portion 110, the column portion 120, and the riveting portion 130 are an integral structure.

[0045] In one embodiment, the plate portion 110 has a flat structure, and the length direction, width direction, and thickness direction of the plate portion 110 are consistent with the cover plate body 200.

[0046] In one embodiment, the column portion 120 has a columnar structure.

[0047] In one embodiment, the cross-section of the column portion 120 perpendicular to the thickness direction of the cover plate body 200 is racetrack shaped.

[0048] Specifically, the area of ​​the runway is That is, the area of ​​the cross-section of the column portion 120 perpendicular to the thickness direction of the cover plate body 200 is , ;

[0049] in:

[0050] r is the radius of the semicircles at both ends of the runway shape;

[0051] m is the length of the rectangle between the two semicircles in the runway shape.

[0052] In one embodiment, the cover plate body 200 has two mounting holes 210 that penetrate through the cover plate body 200 in the thickness direction.

[0053] Specifically, two mounting holes 210 are spaced apart along the length of the cover plate body 200.

[0054] Two pole posts 100 are respectively installed in two mounting holes 210 of the cover plate body 200, that is, one pole post 100 is installed in each mounting hole 210 of the cover plate body 200.

[0055] Specifically, the post 120 of the pole post 100 passes through the mounting hole 210 of the cover plate body 200, and the plate part 110 of the pole post 100 is located on the first side in the thickness direction of the cover plate body 200; the riveting part 130 of the pole post 100 is located on the second side in the thickness direction of the cover plate body 200 opposite to the first side; the riveting block 500 is located on the second side in the thickness direction of the cover plate body 200 and is riveted and fixed to the two pole posts 100 through the two riveting parts 130.

[0056] The rivet block 500 has a flat structure, and its length, width, and thickness are consistent with those of the cover plate body 200.

[0057] In one embodiment, the rivet block 500 has two rivet holes 510 extending through the rivet block 500 in the thickness direction along the length direction of the cover plate body 200, and the rivet portions 130 of the two pole posts 100 are respectively riveted into the two rivet holes 510.

[0058] The distance between the two rivet holes 510 along the length of the rivet block 500 is L, and the width of the rivet block 500 is b.

[0059] In the thickness direction of the cover plate body 200, the rivet block 500 is welded to the busbar on the side away from the cover plate body 200. The weld area 900 of the busbar and the rivet block is located between the two rivet holes 510. The distance between the weld area 900 and the two rivet holes 510 in the length direction of the cover plate body 200 is c. The width of the weld area 900 in the width direction of the cover plate body 200 is d. The distance between the two rivet holes 510 in the length direction of the cover plate body 200 is L.

[0060] The welding area between the busbar and the rivet block 500 is The unit is mm. 2 .

[0061]

[0062] Require .

[0063] In one embodiment, c is approximately 1 mm; d is approximately 2.5 mm.

[0064] In one embodiment, c is 0.8mm-1.2mm; d is 1.5mm-4mm. c and d may also be other ranges.

[0065] Ensure that the current-carrying area of ​​the solder area 900 of the rivet block 500 and the busbar is not less than the total current-carrying area of ​​the two poles 100, that is, ensure that the current-carrying capacity of the solder area 900 of the rivet block 500 and the busbar is not less than the total current-carrying capacity of the two poles 100, and at the same time ensure that the size of the rivet block 500 is not too large and affects the flatness and other requirements of the rivet block 500.

[0066] In one embodiment, the cover plate body 200 is made of smooth aluminum plate. A first insulating member 300 is provided between the riveting block 500 and the cover plate body 200. A sealing member 600 is fitted onto the column portion 120 of the pole post 100, and the sealing member 600 is located between the inner surface of the mounting hole 210 and the column portion 120. A second insulating member 400 is provided between the plate portion 110 of the two pole posts 100 and the cover plate body 200.

[0067] In one embodiment, both the first insulating element 300 and the second insulating element 400 are made of plastic.

[0068] In one embodiment, the second insulating member 400 is provided with two recesses on the side of the plate portion 110 near the two pole posts 100, and the plate portion 110 of the two pole posts 100 is respectively disposed in the two recesses to increase the stability of the structure.

[0069] In one embodiment, this application also discloses a battery including a housing 800, an electrode assembly 700, and a cell cover plate. The housing 800 is provided with a receiving space and an open opening. The electrode assembly 700 is disposed in the receiving space, and the cell cover plate is arranged at the opening of the housing 800.

[0070] In one embodiment, the tabs of the electrode assembly 700 are electrically connected to the plate portions 110 of the two pole posts 100, respectively.

[0071] In one embodiment, the housing 800 has two openings located at opposite ends of the housing 800.

[0072] This application also discloses a battery pack including multiple batteries, wherein a riveting block 500 is welded to a busbar on the side away from the cover body 200 in the thickness direction of the cover body 200.

[0073] In one embodiment, the rivet block 500 has two rivet holes 510 extending through the rivet block 500 in the thickness direction along the length direction of the cover plate body 200, and the busbar and the solder area 900 of the rivet block 500 are located between the two rivet holes 510.

[0074] In one embodiment, the welding area between the busbar and the riveting block 500 is... , ;

[0075] The area of ​​the runway type is , ;

[0076] .

[0077] 1. The distance c=1mm between the soldering area 900 and the two riveting holes 510 along the length of the cover body 200, the width d=3mm of the soldering area 900 along the width of the cover body 200, the length m=5.5mm of the rectangle between the two semicircles in the racetrack shape, the radius r=2.5mm of the semicircles at both ends of the racetrack shape, the different spacing L of the two riveting holes 510 along the length of the cover body 200, the actual measurement of whether the maximum temperature of the riveting block 500 under the same charging conditions meets ≤55℃, and the actual measurement of whether the surface flatness of the riveting block 500 after riveting meets the requirement (0.2):

[0078]

[0079] 2. The distance c=1mm between the soldering area 900 and the two riveting holes 510 along the length of the cover plate body 200, the width d=2.5mm of the soldering area 900 along the width of the cover plate body 200, the length m=5mm of the rectangle between the two semicircles in the racetrack shape, the radius r=2.2mm of the semicircles at both ends of the racetrack shape, the different spacing L of the two riveting holes 510 along the length of the cover plate body 200, the actual measurement of whether the highest temperature of the riveting block under the same charging conditions meets ≤55℃, and the actual measurement of whether the surface flatness of the riveting block after riveting meets the requirement (0.2):

[0080]

[0081] 3. The distance c=1mm between the solder area 900 and the two riveting holes 510 along the length of the cover plate body 200, the width d=3mm of the solder area 900 along the width of the cover plate body 200, the length m=5mm of the rectangle between the two semicircles in the racetrack shape, the radius r=2.5mm of the semicircles at both ends of the racetrack shape, the different spacing L of the two riveting holes 510 along the length of the cover plate body 200, the actual measurement of whether the highest temperature of the riveting block under the same charging conditions meets ≤55℃, and the actual measurement of whether the surface flatness of the riveting block after riveting meets the requirement (0.2):

[0082]

[0083] The above cases illustrate: The requirements for cell use are met within the range of 1-1.2.

[0084] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery pack, characterized by, The battery comprises a plurality of batteries, and each battery comprises a shell (800) and a cell cover plate; The cell cover plate comprises: a cover plate body (200) in a flat structure, a length direction, a width direction and a thickness direction being defined based on the cover plate body (200); the cover plate body (200) is provided with two mounting holes (210) penetrating through the cover plate body (200) in the thickness direction; two pole columns (100) respectively corresponding to the two mounting holes (210) of the cover plate body (200), the pole column (100) comprising a plate body portion (110), a column body portion (120) and a riveting portion (130) arranged in sequence in the thickness direction of the cover plate body (200); the column body portion (120) penetrates through the mounting hole (210), the plate body portion (110) is located on a first side in the thickness direction of the cover plate body (200), and the riveting portion (130) is located on a second side opposite to the first side in the thickness direction of the cover plate body (200); a riveting block (500) located on the second side in the thickness direction of the cover plate body (200) and riveted and fixed with the two pole columns (100) through the two riveting portions (130); wherein the cross section of the column body portion (120) perpendicular to the thickness direction of the cover plate body (200) is in a runway shape; In the thickness direction of the cover plate body (200), the riveting block (500) is welded away from the cover plate body (200) side; the welding area of the bus bar and the riveting block (500) is , the area of the section of the columnar portion (120) perpendicular to the thickness direction of the cover plate body (200) is , .

2. The battery pack of claim 1, wherein, the riveting block (500) is provided with two riveting holes (510) penetrating through the riveting block (500) in the thickness direction along the length direction of the cover plate body (200), and the riveting portions (130) of the two pole columns (100) are respectively riveted in the two riveting holes (510).

3. The battery pack of claim 1, wherein, The cover plate body (200) is an aluminum plate, the first insulating member (300) is arranged between the riveting block (500) and the cover plate body (200), the second insulating member (400) is arranged between the plate body portion (110) of the two pole columns (100) and the cover plate body (200), and the sealing member (600) is arranged between the inner surface of the mounting hole (210) and the column body portion (120).

4. The battery pack of claim 3, wherein, The second insulating member (400) is provided with two recesses close to one side of the plate body portion (110) of the two pole columns (100), and the plate body portion (110) of the two pole columns (100) is respectively embedded in the two recesses.

5. The battery pack of claim 1, wherein: The shell (800) is provided with a containing space and an open opening; the cell cover plate is arranged at the opening of the shell (800); the battery further comprises a pole group (700) arranged in the containing space of the shell (800); the tab of the pole group (700) and the plate body portion (110) of the two pole columns (100) are respectively electrically connected.

6. The battery pack of claim 5, wherein, The shell (800) has two openings located at opposite ends of the shell (800).

7. The battery pack of claim 1, wherein, The riveting block (500) is provided with two riveting holes (510) penetrating through the riveting block (500) in the thickness direction along the length direction of the cover plate body (200), and the welding mark area (900) of the bus bar and the riveting block (500) is located between the two riveting holes (510).

8. The battery pack of claim 7, wherein, The interval of the welding mark area (900) and the two riveting holes (510) in the length direction of the cover plate body (200) is c, the width of the welding mark area (900) in the width direction of the cover plate body (200) is d; the interval of the two riveting holes (510) in the length direction of the cover plate body (200) is L, and the width of the riveting block (500) is b; the welding area of the bus bar and the riveting block (500) is , ; The area of the section of the cylindrical portion (120) perpendicular to the thickness direction of the cover plate main body (200) is , ; wherein: r is the radius of the semicircle at both ends of the runway shape; m is the length of the rectangle between the two semicircles of the runway shape.

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