Battery assembly, battery and electric vehicle

Abstract

The utility model provides a battery assembly which comprises a cover plate (2) and a pole (3), and the pole (3) penetrates through the cover plate (2) and is fixed with the cover plate (2) through riveting. According to the battery assembly provided by the utility model, the pole (3) and the cover plate (2) are fixed through riveting, and compared with a welding fixing mode, the fixing operation is simplified, the production efficiency is improved, and the production cost is reduced. The invention further provides a battery and an electric vehicle.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery assembly, a battery, and an electric vehicle. Background Art

[0002] With the development of electronic technology, lithium-ion batteries have gained widespread application due to their high power density, long cycle life, excellent safety, and pollution-free performance. Lithium-ion batteries can be categorized by their appearance, including cylindrical, prismatic, and soft-pack batteries. Cylindrical batteries are receiving increasing attention and are becoming increasingly widely used.

[0003] Existing cylindrical batteries generally include a shell, a cover plate, and a battery cell. The positive and negative connection terminals of existing cylindrical batteries are respectively arranged at opposite ends of the cylindrical battery, which imposes certain restrictions on the battery grouping technology and affects the battery arrangement and battery energy density (because the positive and negative connection terminals are respectively arranged at opposite ends of the cylindrical battery, when the batteries are grouped in series and parallel, the batteries must first be placed according to the corresponding polarity requirements, which not only increases the risk of incorrect battery placement, but also increases the number of structural components, making the wiring design more complicated, increasing production costs, and reducing the energy density of the battery). Moreover, the existing cylindrical battery collector has a long electrical connection path with the pole and a small contact area, resulting in poor thermal conductivity. Therefore, the existing cylindrical battery still needs to be improved in structure to solve problems such as the complexity of battery grouping and production costs, while improving the heat dissipation and sealing performance of the battery. Utility Model Content

[0004] The purpose of this application is to provide a battery assembly and a battery, aiming to solve or at least partially solve the shortcomings of the above-mentioned background technology. The pole and the cover plate are fixed by riveting, which not only simplifies the fixing operation and improves production efficiency, but also reduces production costs compared to the welding fixing method.

[0005] An embodiment of the present application provides a battery assembly, including a cover plate and a pole, wherein the pole passes through the cover plate and is fixed to the cover plate by riveting.

[0006] In one feasible embodiment, a through hole is provided on the cover plate, and the pole includes a main body and a first end and a second end respectively located at opposite ends of the main body, the main body is arranged in the through hole, the first end and the second end extend from the main body in opposite directions to the outside of the through hole, and the cover plate, the first end and the second end are riveted together; the portion of the cover plate involved in the riveting is located between the first end and the second end.

[0007] In one achievable manner, a stopper is provided at the first end of the pole, a flange is formed at the second end of the pole, the stopper, the flange and the cover plate are riveted together; the riveted portion of the cover plate is located between the stopper and the flange.

[0008] In one achievable manner, the battery assembly further includes a pressing block, which participates in riveting, that is, the pressing block, the pole and the cover plate are riveted, and the pressing block is arranged at the first end and / or the second end of the pole.

[0009] In one achievable manner, the pressing block is an annular structure, and the pressing block is sleeved on the first end and / or the second end of the pole.

[0010] In one feasible manner, a flange is formed on the first end or the second end of the pole, the pressure block is arranged on the pole near the flange, and the pressure block is located between the flange and the cover plate; or, a stop portion is provided on the first end or the second end of the pole, the pressure block is arranged on the pole near the stop portion, and the pressure block is located between the stop portion and the cover plate.

[0011] In one achievable manner, the battery assembly further includes an insulating sealing ring, which is sleeved on the pole and is used for insulation and sealing between the pole and the cover plate.

[0012] In one achievable manner, the battery assembly further includes a first current collecting plate, and the first current collecting plate is electrically connected to the pole.

[0013] In one achievable manner, the first current collecting disc includes a disc body and an electrical connection portion, wherein the electrical connection portion is formed by the disc body extending and protruding toward the pole, and the electrical connection portion is electrically connected to the pole.

[0014] In one achievable manner, a central hole is provided on the pole, the electrical connection portion is inserted into the central hole, and the electrical connection portion is electrically connected to the pole.

[0015] In one achievable manner, a side wall of the electrical connection portion contacts an inner wall of the central hole to achieve electrical connection between the electrical connection portion and the pole.

[0016] In one achievable manner, the battery assembly further includes a sealing sheet, which is sealed to the pole and seals the central hole on the pole.

[0017] In one achievable manner, the electrode is a positive electrode or a negative electrode.

[0018] Another embodiment of the present application further provides a battery, comprising the battery assembly described above.

[0019] In one feasible embodiment, the battery further includes a shell, at least one end of the shell is provided with an opening, and the cover is used to seal the opening of the shell; the opposite ends of the pole are respectively located outside and inside the opening of the shell.

[0020] In one feasible embodiment, the battery further includes a first current collecting tray, a second current collecting tray and a battery cell, wherein the first current collecting tray, the second current collecting tray and the battery cell are all arranged in the shell, and the two sides of the first current collecting tray are electrically connected to the top of the battery cell and the pole respectively, and the two sides of the second current collecting tray are electrically connected to the bottom of the battery cell and the shell respectively.

[0021] In one achievable manner, two sides of the first collecting plate respectively contact the top of the battery cell and the pole to achieve electrical connection, and two sides of the second collecting plate respectively contact the bottom of the battery cell and the shell to achieve electrical connection.

[0022] In one achievable embodiment, the first current collecting tray may be a positive electrode current collecting tray or a negative electrode current collecting tray; the second current collecting tray may also be a positive electrode current collecting tray or a negative electrode current collecting tray. When the first current collecting tray is a positive electrode current collecting tray, the second current collecting tray is a negative electrode current collecting tray; conversely, when the first current collecting tray is a negative electrode current collecting tray, the second current collecting tray is a positive electrode current collecting tray.

[0023] Another embodiment of the present application further provides an electric vehicle comprising the battery described above.

[0024] Another embodiment of the present application further provides a method for preparing a battery assembly, the method comprising:

[0025] Provide cover plates and poles;

[0026] Passing the pole through the cover plate; and

[0027] The pole and the cover plate are fixed by riveting.

[0028] In one achievable manner, the cover plate is provided with a through hole, the pole has a first end and a second end opposite to each other, and the first end of the pole is provided with a stopper;

[0029] The above-mentioned step of passing the pole through the cover plate includes: inserting the pole into the through hole of the cover plate until the second end of the pole passes through the cover plate;

[0030] The fixing of the pole and the cover plate by riveting includes: mechanically pressurizing the second end of the pole to form a flange, fixing the pole and the cover plate by riveting, and the stopper and the flange cooperating to press the cover plate.

[0031] In the battery assembly provided in the present application, the pole and the cover plate are fixed by riveting. Compared with the fixing method of welding, it not only simplifies the fixing operation and improves production efficiency, but also reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a cross-sectional schematic diagram of the battery assembly in the first embodiment of the present application.

[0033] Figure 2 for Figure 1 Schematic cross-section of the middle cover.

[0034] Figure 3 for Figure 1 Schematic diagram of the cross section of the center pole.

[0035] Figure 4 for Figure 1 Schematic diagram of the three-dimensional structure of the first collecting plate.

[0036] Figure 5 This is a schematic cross-sectional view of a battery assembly in the second embodiment of the present application.

[0037] Figure 6 Schematic cross-sectional view of the battery assembly in the third embodiment of the present application.

[0038] Figure 7 This is a schematic cross-sectional view of a battery assembly in the fourth embodiment of the present application.

[0039] Figure 8 This is a schematic cross-sectional view of the battery assembly in the fifth embodiment of the present application.

[0040] Figure 9 This is a cross-sectional schematic diagram of the battery assembly in the sixth embodiment of the present application.

[0041] Figure 10 This is a cross-sectional schematic diagram of the battery assembly in the seventh embodiment of the present application.

[0042] Figure 11 This is a schematic cross-sectional view of the battery assembly in the eighth embodiment of the present application. DETAILED DESCRIPTION

[0043] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0044] The terms "first," "second," "third," "fourth," etc. (if any) in the description and claims of this application are used to distinguish similar objects and not necessarily to describe a particular sequential order.

[0045] The directional terms "up," "down," "left," "right," "front," "back," "top," and "bottom" (if any) in the specification and claims of this application are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, and are intended only for clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0046] like Figures 1 to 4 As shown, the battery assembly provided in the first embodiment of the present application includes a cover plate 2 and a pole 3. The pole 3 passes through the cover plate 2 and is fixed to the cover plate 2 by riveting.

[0047] Specifically, in this embodiment, the pole 3 and the cover plate 2 are fixed by riveting, which not only simplifies the operation and improves the production efficiency, but also reduces the production cost compared with the welding fixing method.

[0048] like Figures 1 to 3 As shown, as an embodiment, a through hole 21 is provided on the cover plate 2, and the pole 3 includes a main body 30A and a first end 30B and a second end 30C respectively located at opposite ends of the main body 30A. The main body 30A is inserted into the through hole 21, and the first end 30B and the second end 30C extend from the main body 30A in opposite directions to the outside of the through hole 21 (in this embodiment, the first end 30B extends upward from the main body 30A, and the second end 30C extends downward from the main body 30A). The cover plate 2, the first end 30B and the second end 30C are riveted together, and the riveted portion of the cover plate 2 is located between the first end 30B and the second end 30C.

[0049] like Figure 1 As shown, as an embodiment, the battery assembly further includes a pressing block 4, which participates in riveting, that is, the pressing block 4, the terminal 3, and the cover plate 2 are riveted together, and the pressing block 4 is arranged at the first end 30B and / or the second end 30C of the terminal 3. During riveting, the terminal 3 and the pressing block 4 are embedded.

[0050] Specifically, in this embodiment, the pressing block 4 can be an aluminum block. Of course, in other embodiments, the pressing block 4 can also be made of other materials.

[0051] like Figure 1 As shown, as an embodiment, the pressing block 4 is disposed at the second end 30C of the pole 3 (i.e., the pressing block 4 fills the lower end of the pole 3). Of course, in other embodiments, the pressing block 4 may also be disposed at the first end 30B of the pole 3, or at both the first end 30B and the second end 30C of the pole 3.

[0052] like Figure 1 As shown, as an embodiment, the pressing block 4 is an annular structure, and the pressing block 4 is sleeved on the second end 30C of the pole 3. Of course, in other embodiments, the pressing block 4 can also be sleeved on the first end 30B of the pole 3, or sleeved on both the first end 30B and the second end 30C of the pole 3.

[0053] like Figure 1 As shown, as one embodiment, the pole 3 has a T-shaped structure. A stopper 31 is provided at the first end 30B of the pole 3. The stopper 31 is formed by a radially outward protrusion from the sidewall of the pole 3 and is located on one side of the cover plate 2. A flange 32 is formed at the second end 30C of the pole 3. The flange 32 is formed by a radially outward protrusion from the sidewall of the pole 3 and is located on the other side of the cover plate 2. In the radial direction of the pole 3, the diameter of the stopper 31 is larger than the diameter of the flange 32. The stopper 31 and the flange 32 are riveted to the cover plate 2, with the portion of the cover plate 2 involved in the riveting being located between the stopper 31 and the flange 32. Of course, in other embodiments, the second end 30C of the pole 3 may also be provided with the stopper 31, while the first end 30B of the pole 3 may be provided with the flange 32.

[0054] Specifically, in this embodiment, the stop portion 31 is arranged at the top of the pole 3, the stop portion 31 is located above the cover plate 2, and the stop portion 31 is located outside the shell 1; the flange 32 is arranged at the bottom of the pole 3, the flange 32 is located below the cover plate 2, and the flange 32 is located inside the shell 1.

[0055] like Figure 1 As shown in FIG. 1 , as an embodiment, the pressing block 4 is sleeved on the pole 3 near the flange 32, and the pressing block 4 is located between the flange 32 and the cover plate 2. During riveting, the pressing block 4 and the flange 32 are engaged. Of course, in other embodiments, the pressing block 4 can also be sleeved on the pole 3 near the stopper 31, in which case the pressing block 4 is located between the stopper 31 and the cover plate 2.

[0056] Specifically, if Figure 1 and Figure 3 As shown, the stopper 31 is a structure inherent to the pole 3 (i.e., the stopper 31 exists before the pole 3 and the cover plate 2 are riveted together), and the flange 32 is formed when the pole 3 and the cover plate 2 are riveted together (i.e., the flange 32 does not exist before the pole 3 and the cover plate 2 are riveted together). Figure 1As shown, in this embodiment, when the pole 3 and the cover plate 2 are riveted, the T-shaped pole 3 is first inserted from top to bottom into the through-hole 21 of the cover plate 2. Then, the lower end of the pole 3 is mechanically pressed (such as by screw riveting) to flatten it to form a flange 32. During the process of pressurizing and flattening the lower end of the pole 3 to form the flange 32, an upsetting effect is produced on the pole 3 (i.e., the length of the pole 3 is shortened and the diameter is increased), thereby fixing the pole 3 and the cover plate 2, thereby achieving the riveting of the pole 3 and the cover plate 2. The stopper 31 and the flange 32 both serve as limiters, and the stopper 31 and the flange 32 cooperate to press the cover plate 2 tightly to prevent the pole 3 from falling out of the through-hole 21 of the cover plate 2. At the same time, when the pole 3 and the cover plate 2 are riveted, the insulating sealing ring 51 is compressed in the process of forming the flange 32 of the pole 3, so that the gap between the stopper 31 and the cover plate 2 is completely filled by the insulating sealing ring 51, thereby improving the sealing performance of the battery.

[0057] like Figure 1 and Figure 4 As shown, as an embodiment, the battery assembly further includes a first current collecting plate 6, which is located on the side of the cover plate 2 close to the battery cell 8, and the first current collecting plate 6 is in contact with the pole 3 to achieve electrical connection between the first current collecting plate 6 and the pole 3.

[0058] like Figure 1 and Figure 4 As shown, as an embodiment, the first current collecting disk 6 includes a disk body 61 and an electrical connection portion 62, the electrical connection portion 62 is formed by the disk body 61 extending and protruding toward the pole 3, the disk body 61 contacts the end face of the battery cell 8, and the electrical connection portion 62 contacts the pole 3 to achieve electrical connection between the electrical connection portion 62 and the pole 3.

[0059] like Figure 1 and Figure 4 As shown, as an embodiment, a central hole 33 is provided on the pole 3 , and the electrical connection portion 62 is inserted into the central hole 33 , and the electrical connection portion 62 is electrically connected to the pole 3 .

[0060] Specifically, the side wall of the electrical connection portion 62 contacts the inner wall of the central hole 33 to achieve electrical connection between the electrical connection portion 62 and the pole 3 .

[0061] Specifically, in this embodiment, the cross section of the electrical connection portion 62 is a circular structure, and the electrical connection portion 62 is a hollow truncated cone structure with a diameter gradually decreasing in the direction close to the pole 3. By providing the electrical connection portion 62 on the first collecting plate 6, the contact area between the first collecting plate 6 and the pole 3 is increased, so that the heat generated inside the battery cell 8 can be quickly discharged from the pole 3, thereby improving the thermal runaway caused by the high heat generated by the battery cell 8 during high-rate charge and discharge. Of course, if Figure 5 As shown, in other embodiments, the first collecting plate 6 may also be a flat disc-shaped structure.

[0062] like Figure 1 As shown, as an embodiment, the battery assembly further includes an insulating sealing ring 51 , which is sleeved on the pole 3 and close to the stopper 31 , and is used for insulation and sealing between the pole 3 and the cover plate 2 .

[0063] like Figure 1 As shown, as an embodiment, the insulating sealing ring 51 is at least partially disposed in the through hole 21 , and the insulating sealing ring 51 is located between the outer wall of the pole 3 and the inner wall of the through hole 21 .

[0064] Specifically, in this embodiment, the insulating sealing ring 51 has a T-shaped structure (of course, in other embodiments, the insulating sealing ring 51 may also have an O-shaped structure, etc.). A portion of the insulating sealing ring 51 is located within the through-hole 21 (i.e., between the outer wall of the pole 3 and the inner wall of the through-hole 21), and another portion is located outside the cover plate 2 and sandwiched between the stopper 31 and the cover plate 2. This allows the insulating sealing ring 51 to effectively seal between the pole 3 and the cover plate 2, while also isolating the pole 3 from the cover plate 2 to prevent electrical conduction between the pole 3 and the cover plate 2. Furthermore, when the pole 3 and the cover plate 2 are riveted together, as the pole 3 is pressurized to upset the pole 3, the stopper 31 exerts an extrusion force on the insulating sealing ring 51, thereby tightening the insulating sealing ring 51 between the stopper 31 and the cover plate 2, thereby further improving the sealing effect.

[0065] like Figure 1 As shown, as an embodiment, the battery assembly further includes an insulating ring 52, which is disposed between the stopper 31 and the cover plate 2. The insulating ring 52 is used to isolate the pole 3 and the cover plate 2 to prevent the pole 3 and the cover plate 2 from conducting electricity.

[0066] Specifically, in this embodiment, the insulating sealing ring 51 is a small circular ring structure with a central opening, and the insulating ring 52 is a large circular ring structure with a central opening. The insulating ring 52 is arranged around the outer periphery of the insulating sealing ring 51 .

[0067] like Figure 1 As shown, as an embodiment, the battery assembly further includes an insulating gasket 53 , which is disposed between the pressing block 4 and the cover plate 2 .

[0068] Specifically, in this embodiment, a portion of the insulating gasket 53 is located between the pressing block 4 and the cover plate 2, and another portion is located between the first collecting plate 6 and the cover plate 2, thereby preventing the pressing block 4 and the cover plate 2 from conducting electricity, and preventing the first collecting plate 6 and the cover plate 2 from conducting electricity.

[0069] like Figure 1As shown, as an embodiment, the battery assembly further includes a sealing sheet 9 (the sealing sheet 9 may be an explosion-proof sheet), which is sealed to the top surface of the pole 3 and seals the central hole 33 on the pole 3 .

[0070] like Figure 5 As shown, the battery assembly provided in the second embodiment of the present application is substantially the same as the first embodiment, except that the structures of the terminal post 3 and the first current collecting disc 6 are different. Specifically, in this embodiment, the first current collecting disc 6 is a flat disc-shaped structure, the terminal post 3 is a solid block (i.e., the terminal post 3 is not provided with a center hole 33), and the first current collecting disc 6 is in contact with the bottom surface of the terminal post 3.

[0071] like Figure 6 As shown, the battery assembly provided in the third embodiment of the present application is substantially the same as the first embodiment, except that the pressing block 4 is not provided on the pole 3. Therefore, the insulating gasket 53 is directly sandwiched between the flange 32 and the cover plate 2.

[0072] like Figure 7 As shown, the battery assembly provided in the fourth embodiment of the present application is substantially the same as the first embodiment, differing in the structures of the terminal post 3 and the first current collecting disc 6, and the absence of the pressure block 4 on the terminal post 3. Specifically, in this embodiment, the first current collecting disc 6 is a flat, disc-shaped structure, the terminal post 3 is a solid block (i.e., the terminal post 3 does not have a center hole 33), and the first current collecting disc 6 contacts the bottom surface of the terminal post 3. In addition, an insulating gasket 53 is directly sandwiched between the flange 32 and the cover plate 2.

[0073] like Figure 8 As shown, the battery assembly provided in the fifth embodiment of the present application is substantially the same as that in the first embodiment, except that the structure of the pole 3 is different, and the positions of the pressing block 4 and the insulating sealing ring 51 are different. Specifically, in this embodiment, the pole 3 is an inverted T-shaped structure, the stopper 31 is arranged at the bottom of the pole 3, the stopper 31 is located below the cover plate 2, and the stopper 31 is located inside the shell 1, and the pressing block 4 fills the upper end of the pole 3. The pressing block 4 is clamped between the flange 32 and the insulating ring 52, and the insulating ring 52 is clamped between the pressing block 4 and the cover plate 2. A portion of the insulating sealing ring 51 is located in the through hole 21 (that is, between the outer wall of the pole 3 and the inner wall of the through hole 21), and the other portion is located on the inner side of the cover plate 2 and clamped between the stopper 31 and the cover plate 2. In this embodiment, when the pole 3 and the cover plate 2 are riveted, the pole 3 with an inverted T-shaped structure is first inserted from bottom to top into the through hole 21 on the cover plate 2, and then the upper end of the pole 3 is mechanically pressurized and flattened to form a flange 32. The stopper 31 and the flange 32 cooperate to press the cover plate 2 tightly, so that the pole 3 and the cover plate 2 are fixed, thereby achieving riveting of the pole 3 and the cover plate 2.

[0074] like Figure 9As shown, the battery assembly provided in the sixth embodiment of the present application is substantially the same as that in the fifth embodiment, and the terminal post 3 also has an inverted T-shaped structure. The difference lies in the structures of the terminal post 3 and the first current collecting disc 6. Specifically, in this embodiment, the first current collecting disc 6 has a flat disc-shaped structure, the terminal post 3 is a solid block (i.e., the terminal post 3 does not have a center hole 33), and the first current collecting disc 6 contacts the bottom surface of the terminal post 3.

[0075] like Figure 10 As shown, the battery assembly provided in the seventh embodiment of the present application is substantially the same as that in the fifth embodiment, and the pole 3 also has an inverted T-shaped structure. The difference is that the pressing block 4 is not provided on the pole 3. Therefore, the insulating ring 52 is directly sandwiched between the flange 32 and the cover plate 2.

[0076] like Figure 11 As shown, the battery assembly provided in the eighth embodiment of the present application is substantially the same as that in the fifth embodiment. The terminal 3 also has an inverted T-shaped structure. The difference lies in the structures of the terminal 3 and the first current collecting plate 6, and the absence of the pressure block 4 on the terminal 3. Specifically, in this embodiment, the first current collecting plate 6 is a flat, disc-shaped structure, while the terminal 3 is a solid block (i.e., the terminal 3 does not have a center hole 33). The first current collecting plate 6 contacts the bottom surface of the terminal 3. Furthermore, an insulating ring 52 is directly sandwiched between the flange 32 and the cover plate 2.

[0077] like Figure 1 As shown, the first embodiment of the present application also provides a battery, particularly suitable for cylindrical batteries. The battery includes the battery assembly described above and a housing 1. The housing 1 is a cylindrical trough structure with an opening 11 at the top. A cover plate 2 is used to seal the opening 11 of the housing 1. The cover plate 2 is fixed to the opening 11 of the housing 1 and is electrically connected to the housing 1. The opposite ends of the pole 3 are respectively located outside and inside the opening 11 of the housing 1.

[0078] As another embodiment, the top of the cylindrical battery body is provided with a groove (not shown in the figure), and the pole 3 is inserted into the groove. In addition, an insulating sealing ring 51 of matching specifications can also be sleeved into the groove.

[0079] like Figure 1 As shown, as an embodiment, the battery further includes a first current collecting tray 6, a second current collecting tray 7, and a battery cell 8. The first current collecting tray 6, the second current collecting tray 7, and the battery cell 8 are all disposed within the housing 1. The first current collecting tray 6 is located between the top of the battery cell 8 and the pole 3, and the two sides of the first current collecting tray 6 are electrically connected to the top of the battery cell 8 and the pole 3, respectively. The second current collecting tray 7 is located between the bottom end of the battery cell 8 and the housing 1, and the two sides of the second current collecting tray 7 are electrically connected to the bottom end of the battery cell 8 and the housing 1, respectively.

[0080] like Figure 1As shown, as an embodiment, both sides of the first collecting plate 6 are in contact with the top of the battery cell 8 and the pole 3 to achieve electrical connection, and both sides of the second collecting plate 7 are in contact with the bottom of the battery cell 8 and the shell 1 to achieve electrical connection.

[0081] like Figure 1 and Figure 4 As shown, as an embodiment, the first collecting disc 6 includes a disc body 61 and an electrical connection portion 62, the electrical connection portion 62 extends and protrudes from the disc body 61 toward the pole 3, and the disc body 61 contacts the end face of the battery cell 8; a center hole 33 is provided on the pole 3, the electrical connection portion 62 is inserted into the center hole 33, and the side wall of the electrical connection portion 62 contacts the inner wall of the center hole 33.

[0082] like Figure 1 As shown, as an embodiment, a positive electrode tab 81 and a negative electrode tab 82 are respectively provided at both ends of the battery cell 8, the pole 3 is a positive pole, the first current collecting disc 6 is a positive current collecting disc, and the second current collecting disc 7 is a negative current collecting disc. The two sides of the first current collecting disc 6 are in contact with the positive electrode tab 81 of the battery cell 8 and the pole 3, respectively, and the two sides of the second current collecting disc 7 are in contact with the negative electrode tab 82 of the battery cell 8 and the bottom wall of the housing 1, respectively. Of course, in other embodiments, it is also possible that: the pole 3 is a negative pole, the first current collecting disc 6 is a negative current collecting disc, and the second current collecting disc 7 is a positive current collecting disc. The two sides of the first current collecting disc 6 are in contact with the negative electrode tab 82 of the battery cell 8 and the pole 3, respectively, and the two sides of the second current collecting disc 7 are in contact with the positive electrode tab 81 of the battery cell 8 and the bottom wall of the housing 1, respectively.

[0083] Specifically, when the electrode 3 is a positive electrode, the shell 1 can be a steel shell (of course, it can also be other materials). In this case, the electrode 3 serves as the positive electrical connection terminal of the battery, and the shell 1 and the cover plate 2 serve as the negative electrical connection terminal of the battery. When the electrode 3 is a negative electrode, the shell 1 can be an aluminum shell. In this case, the electrode 3 serves as the negative electrical connection terminal of the battery, and the shell 1 and the cover plate 2 serve as the positive electrical connection terminal of the battery. In this embodiment, the positive and negative electrodes of the battery are led to the same side of the battery by using the electrode 3 and the cover plate 2 as the positive electrical connection terminal and the negative electrical connection terminal respectively (or the electrode 3 as the negative electrical connection terminal and the cover plate 2 as the positive electrical connection terminal). Compared with the design of arranging the positive and negative electrical connection terminals at opposite ends of the battery, this is conducive to battery grouping, can facilitate battery arrangement, reduce the number of structural components when the batteries are grouped, simplify the wiring design of the BMS, reduce costs, and make the battery arrangement more compact, thereby improving the energy density of the battery.

[0084] like Figure 1 As shown, as an embodiment, the positive tab 81 and the negative tab 82 of the battery cell 8 both adopt a full-tab design, and the first collecting plate 6 and the positive tab 81 as well as the second collecting plate 7 and the negative tab 82 can be fixed by welding.

[0085] As an embodiment, an electrolyte solution is further provided in the housing 1 to enable the battery to be charged and discharged through electrochemical reactions between the positive and negative electrodes of the battery cell 8 and the electrolyte solution. The electrolyte solution can be formed from an organic solvent such as EC, PC, DEC, EMC, and EMC, and a lithium salt such as LiPF6 or LiBF4. The electrolyte can be in a liquid, solid, or gel state.

[0086] The first embodiment of the present application further provides a method for preparing a battery assembly, the method comprising:

[0087] Providing a cover plate 2 and a pole 3;

[0088] Pass the pole 3 through the cover 2; and

[0089] The pole 3 is fixed to the cover plate 2 by riveting.

[0090] As an embodiment, the cover plate 2 is provided with a through hole 21 , the pole 3 has a first end 30B and a second end 30C that are oppositely disposed, and the first end 30B of the pole 3 is provided with a stopper 31 .

[0091] Specifically, the above-mentioned passing the pole 3 through the cover plate 2 includes: inserting the pole 3 into the through hole 21 of the cover plate 2 until the second end 30C of the pole 3 passes through the cover plate 2 .

[0092] Specifically, the above-mentioned fixing of the pole 3 and the cover plate 2 by riveting includes: mechanically pressurizing the second end 30C of the pole 3 to form a flange 32, fixing the pole 3 and the cover plate 2 by riveting, and the stopper 31 and the flange 32 cooperate to press the cover plate 2 tightly.

[0093] The advantages of the battery assembly and battery provided by the embodiments of the present application are:

[0094] 1. Riveting the pole 3 and the cover plate 2 not only simplifies the operation and improves the production efficiency, but also reduces the production cost;

[0095] 2. By using the pole 3 and the cover plate 2 as the positive electrical connection terminal and the negative electrical connection terminal respectively (or using the pole 3 as the negative electrical connection terminal and the cover plate 2 as the positive electrical connection terminal), the positive and negative electrodes of the battery are led to the same side of the battery, which is conducive to battery grouping, can facilitate battery arrangement, reduce the number of structural components when the battery is grouped, simplify the wiring design of the BMS, reduce costs, and make the battery arrangement more compact, thereby improving the energy density of the battery;

[0096] 3. By providing an electrical connection portion 62 on the first current collecting disc 6, the contact area between the first current collecting disc 6 and the pole 3 is increased, so that the heat generated inside the battery cell 8 can be quickly discharged from the pole 3, thereby improving thermal runaway caused by the high heat generated by the battery cell 8 during high-rate charge and discharge;

[0097] 4. The insulating sealing ring 51 has good sealing performance (when the pole 3 and the cover plate 2 are riveted, the pole 3 will squeeze the insulating sealing ring 51 when it is upset, so that the insulating sealing ring 51 is compressed, thereby improving the sealing effect of the insulating sealing ring 51). It is long-lasting and can prevent the battery from leaking during long-term use, thereby increasing the battery life;

[0098] 5. By providing the pressing block 4, the insulating gasket 53 can be prevented from being crushed or broken during the upsetting process of the pole 3, thereby affecting the sealing of the battery. During the upsetting process, the insulating gasket 53 is easily crushed or broken due to the small contact area between the formed flange 32 and the insulating gasket 53. After adding the pressing block 4, the surface area of the pressing block 4 is larger than the surface area of the flange 23, so the contact area between the pressing block 4 and the insulating gasket 53 is increased; in addition, since the pressing block 4 has a certain elasticity, the pressing block 4 can further buffer the pressure on the insulating gasket 53 during the upsetting process. Therefore, by providing the pressing block 4, the contact area with the insulating gasket 53 is increased, and a buffering effect is played, which greatly reduces the pressure on the insulating gasket 53 during the upsetting process, thereby improving the sealing performance of the battery.

[0099] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A battery assembly comprising a cover plate (2) and a terminal (3), characterized in that: The pole (3) passes through the cover plate (2) and is fixed to the cover plate (2) by riveting; the battery assembly further comprises a first current collecting disc (6), the first current collecting disc (6) comprising a disc body (61) and an electrical connection portion (62), the electrical connection portion (62) being formed by the disc body (61) extending and protruding toward the pole (3), and the electrical connection portion (62) being electrically connected to the pole (3).

2. The battery assembly according to claim 1, wherein The cover plate (2) is provided with a through hole (21), and the pole (3) comprises a main body (30A) and a first end (30B) and a second end (30C) respectively located at opposite ends of the main body (30A); the main body (30A) is inserted into the through hole (21), and the first end (30B) and the second end (30C) extend from the main body (30A) to the outside of the through hole (21) in opposite directions; the cover plate (2), the first end (30B) and the second end (30C) are riveted; the portion of the cover plate (2) involved in the riveting is located between the first end (30B) and the second end (30C).

3. The battery assembly according to claim 2, wherein: The first end (30B) of the pole (3) is provided with a stopper (31), the second end (30C) of the pole (3) is formed with a flange (32), the stopper (31), the flange (32) and the cover plate (2) are riveted together; the portion of the cover plate (2) involved in the riveting is located between the stopper (31) and the flange (32).

4. The battery assembly according to claim 2, wherein: The battery assembly further comprises a pressing block (4), the pressing block (4) being involved in riveting, and the pressing block (4) being arranged at the first end (30B) and / or the second end (30C) of the pole (3).

5. The battery assembly according to claim 4, wherein: The pressing block (4) is an annular structure, and the pressing block (4) is sleeved on the first end (30B) and / or the second end (30C) of the pole (3).

6. The battery assembly according to claim 4, wherein: The first end (30B) or the second end (30C) of the pole (3) is formed with a flange (32), the pressing block (4) is arranged on the pole (3) at a position close to the flange (32), and the pressing block (4) is located between the flange (32) and the cover plate (2); or the first end (30B) or the second end (30C) of the pole (3) has a stopper (31), the pressing block (4) is arranged on the pole (3) at a position close to the stopper (31), and the pressing block (4) is located between the stopper (31) and the cover plate (2).

7. The battery assembly according to claim 1, wherein: The battery assembly further comprises an insulating sealing ring (51), which is sleeved on the pole (3) and is used for insulation and sealing between the pole (3) and the cover plate (2).

8. The battery assembly according to claim 1, wherein: The pole (3) is provided with a central hole (33), the electrical connection portion (62) is inserted into the central hole (33), and the electrical connection portion (62) is electrically connected to the pole (3).

9. The battery assembly according to claim 8, wherein: The side wall of the electrical connection portion (62) contacts the inner wall of the central hole (33) to achieve electrical connection between the electrical connection portion (62) and the pole (3).

10. The battery assembly according to claim 8, wherein The battery assembly further comprises a sealing sheet (9), the sealing sheet (9) being sealedly connected to the pole (3), and the sealing sheet (9) sealing the central hole (33) on the pole (3).

11. The battery assembly according to any one of claims 1 to 10, wherein: The pole (3) is a positive pole or a negative pole.

12. A battery, characterized in that: The invention comprises a battery assembly as claimed in any one of claims 1 to 11.

13. The battery according to claim 12, wherein The battery further comprises a shell (1), at least one end of the shell (1) is provided with an opening (11), and the cover plate (2) is used to seal the opening (11) of the shell (1); the opposite ends of the pole (3) are respectively located outside the opening (11) of the shell (1) and inside the opening (11) of the shell (1).

14. The battery according to claim 13, wherein The battery further comprises a first current collecting disc (6), a second current collecting disc (7) and a battery cell (8); the first current collecting disc (6), the second current collecting disc (7) and the battery cell (8) are all arranged in the shell (1); two sides of the first current collecting disc (6) are electrically connected to the top end of the battery cell (8) and the pole (3) respectively; and two sides of the second current collecting disc (7) are electrically connected to the bottom end of the battery cell (8) and the shell (1) respectively.

15. An electric vehicle, characterized in that: Comprising the battery according to any one of claims 12 to 14.

Images