Battery, battery pack and vehicle

Abstract

The utility model provides a battery, a battery pack and a vehicle. The battery comprises a shell, a battery cell, a pair of cover plate assemblies and an explosion-proof valve, and the battery cell is arranged in the shell. The cover plate assemblies are fixed to the two ends of the shell respectively. The anti-explosion valve is arranged between the two ends of the shell. The cover plate assembly comprises a base and a pair of conductive parts; a positive tab and a negative tab are arranged at the two ends of the battery cell, and the pair of conductive parts is connected with the positive tab and the negative tab respectively. The explosion-proof valve is arranged between the two ends of the shell, so that the explosion-proof valve is far away from the conductive piece. When thermal runaway of the battery occurs, the process that gas breaks through the anti-explosion valve does not affect the conductive piece, and the safety of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery, a battery pack and a vehicle. BACKGROUND

[0002] With the continuous development of battery technology, consumers' requirements for battery performance are gradually increasing. The battery is provided with a battery cover plate at both ends, and the battery cover plate includes a pair of conductive pieces for connecting the tabs of the battery cell to realize external power supply of the battery cell.

[0003] When the battery is in thermal runaway, high-temperature and high-pressure gas will be generated inside. At present, an explosion-proof valve is arranged on the battery cover plate, and when the internal pressure of the battery is too high, the high-temperature gas will break the explosion-proof valve to release the pressure. However, the valve opening process of the high-temperature gas will affect the conductive piece, causing the heat generation of the conductive piece to be more serious, thereby reducing the safety of the battery. UTILITY MODEL CONTENT

[0004] The present application provides a battery, a battery pack and a vehicle to solve the related technical problems.

[0005] The first aspect of the present application provides a battery, comprising a shell, a battery cell, a pair of cover plate assemblies, and an explosion-proof valve; the battery cell is installed to the inside of the shell; a pair of the cover plate assemblies are respectively fixed to both ends of the shell; the explosion-proof valve is arranged between both ends of the shell; the cover plate assembly comprises a base and a pair of conductive pieces; the battery cell is provided with a positive tab and a negative tab at both ends, and a pair of the conductive pieces are respectively connected with the positive tab and the negative tab.

[0006] By arranging the explosion-proof valve between both ends of the shell, it is away from the conductive piece. When the battery is in thermal runaway, the process of the gas breaking the explosion-proof valve will not affect the conductive piece, thereby improving the safety of the battery. At the same time, since the battery cell is provided with a positive tab and a negative tab at both ends, the current path during the charging and discharging process of the battery is shortened, and part of the current can be transmitted between the tabs at the same end without crossing the battery cell to reach the tab at the other end, thereby reducing the temperature rise during the charging process and improving the safety of the battery.

[0007] Further, the conductive piece comprises a battery cell connecting portion and a power supply assembly portion which are respectively insulated and abutted with both sides of the base; the battery cell connecting portion passes through the base and is connected with the power supply assembly portion, and a pair of the battery cell connecting portions are respectively connected with the positive tab and the negative tab. By arranging the conductive piece in two parts, the manufacturing difficulty of the conductive piece is reduced.

[0008] Further, the cell connecting part comprises a plate and a plurality of poles, the poles extending from the plate through the base and being connected with the power supply assembly part. By arranging a plurality of poles, the overcurrent area of the conductive part is increased, the internal resistance is reduced, the temperature rise is reduced, and the safety of the battery is improved.

[0009] Further, the plate is provided with a base section and an extension section; the poles are arranged on the base section; and the extension section extends from the base section towards another plate. By arranging the extension section, the connection area of the plate and the cell is increased, the overcurrent area of the conductive part is further improved, and the safety of the battery is improved.

[0010] Further, the poles are in a cylindrical shape. The poles in a cylindrical shape are easy to manufacture, and the stress distribution is more uniform, improving the structural strength of the conductive part.

[0011] Further, the poles are provided with a fixing groove connected with the power supply assembly part. By arranging the fixing groove to connect the power supply assembly part, the structure is simple and easy to manufacture, and the positioning accuracy can be ensured.

[0012] Further, the fixing groove is in an annular shape, so that the stress distribution of the poles is more uniform, improving the structural strength of the conductive part.

[0013] Further, the shell comprises a pair of first side plates arranged oppositely and a pair of second side plates respectively connected with both ends of the pair of first side plates, the area of the first side plate is smaller than that of the second side plate, and the explosion-proof valve is arranged on the first side plate. Since the first side plate has a smaller area, the degree of deformation is smaller, and the explosion-proof valve is arranged on the first side plate, which can avoid the influence of the deformation of the shell on the opening of the explosion-proof valve, ensure the normal opening of the explosion-proof valve, and improve the safety of the battery.

[0014] The second aspect of the present application provides a battery pack comprising the above-mentioned battery. Since the battery has high safety, the battery pack of the present application has high stability.

[0015] The third aspect of the present application provides a vehicle comprising the above-mentioned battery pack. Since the battery pack of the present application has high stability, the vehicle of the present application has high reliability.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present specification. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings herein are incorporated into the specification and form part of the specification, show embodiments consistent with the present specification, and together with the specification serve to explain the principles of the present specification.

[0018] Figure 1 is a structural diagram of a battery in an exemplary embodiment of the present application;

[0019] Figure 2 is a structural diagram of a battery cell in an exemplary embodiment of the present application;

[0020] Figure 3 is Figure 1 is a structural diagram of the middle shell from another perspective;

[0021] Figure 4 is Figure 3 is an enlarged view of a part of the middle shell;

[0022] Figure 5 is Figure 1 is a structural diagram of the cover plate assembly in the middle shell;

[0023] Figure 6 is Figure 5 is an exploded view of the cover plate assembly in the middle shell;

[0024] Figure 7 is Figure 6 is a structural diagram of the battery cell connecting part in the middle shell;

[0025] Figure 8 is a structural diagram of another cover plate assembly in an exemplary embodiment of the present application;

[0026] Figure 9 is Figure 8 is an exploded view of the cover plate assembly in the middle shell.

[0027] BRIEF DESCRIPTION OF THE DRAWINGS: shell-10; first side plate-11; second side plate-12; battery cell-20; positive electrode tab-21; negative electrode tab-22; cover plate assembly-30; base-31; first insulating piece-311; bottom plate-3111; surrounding plate-3112; second insulating piece-312; hollow part-3121; groove-3122; missing groove-3123; isolation part-3124; leg-3125; mounting piece-313; liquid injection hole-3131; through hole-314; first through hole-3141; second through hole-3142; third through hole-3143; conductive piece-32; battery cell connecting part-321; pole plate-3211; pole post-3212; base section-3213; extension section-3214; fixing groove-3215; power supply assembly part-322; fixing hole-3220; main body-3221; flange-3222; sealing ring-33; explosion-proof valve-40. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments (or, “modes of implementation”) of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0029] If the application embodiments involve terms of direction indication or positional relationship (for example, up, down, left, right, front, back, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, motion condition, etc. between components in a certain specific posture (as shown in the drawings); if the specific posture changes, the direction indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. in the application embodiments are only used for the convenience of description, and cannot be understood as indicating or implying relative importance.

[0030] When the battery is in thermal runaway, high-temperature and high-pressure gas will be generated inside. At present, an explosion-proof valve is arranged on the battery cover plate to release the pressure. However, when the high-temperature gas breaks through the explosion-proof valve, it will affect the conductive part, making the heating degree of the conductive part more serious, resulting in low safety of the battery. The application provides a battery to solve the related technical problems.

[0031] As shown in Figures 1 to 4 The application provides a battery, which includes a shell 10, a battery cell 20, a pair of cover plate assemblies 30, and an explosion-proof valve 40. The battery cell 20 is installed to the inside of the shell 10. The pair of cover plate assemblies 30 are respectively fixed to the two ends of the shell 10. The explosion-proof valve 40 is arranged between the two ends of the shell 10.

[0032] The battery cell 20 is provided with a positive electrode lug 21 and a negative electrode lug 22 at both ends. Please refer to Figure 5 As shown in

[0033] By arranging the explosion-proof valve 40 between the two ends of the shell 10, it is far away from the conductive part 32. When the battery is in thermal runaway, the process of gas breaking through the explosion-proof valve 40 will not affect the conductive part 32, improving the safety of the battery. Moreover, by arranging the explosion-proof valve 40 between the two ends of the shell 10, the space at both ends of the shell 10 is increased, which can improve the flow area of the conductive part 32 by increasing the volume of the conductive part 32, reducing the temperature rise of the battery, and further improving the safety of the battery.

[0034] At the same time, since the battery cell 20 is provided with the positive electrode lug 21 and the negative electrode lug 22 at both ends, the current path in the charging and discharging process of the battery is shortened, and part of the current can be transmitted between the electrode lugs at the same end, without crossing the battery cell 20 to reach the electrode lug at the other end, reducing the temperature rise in the charging process and improving the safety of the battery.

[0035] The shell 10 can be made of aluminum, which can meet the requirements of high strength and light weight. The shell 10 includes a pair of first side plates 11 and a pair of second side plates 12. The pair of first side plates 11 are oppositely arranged, and the pair of second side plates 12 are connected to the two ends of the pair of first side plates 11. The area of the first side plate 11 is smaller than that of the second side plate 12. The explosion-proof valve 40 is arranged on the first side plate 11.

[0036] Since the first side plate 11 has a smaller area, the deformation degree thereof is smaller. Arranging the explosion-proof valve 40 on the first side plate 11 can avoid the influence of the deformation of the shell 10 on the opening of the explosion-proof valve 40, ensure that the explosion-proof valve 40 can normally open, and improve the safety of the battery.

[0037] The base 31 includes a first insulating piece 311, a second insulating piece 312, and a mounting piece 313. The first insulating piece 311 and the second insulating piece 312 clamp and fix the mounting piece 313, which can improve the overall strength of the base 31.

[0038] Please refer to Figure 6 As shown in the figure, the first insulating piece 311 includes a bottom plate 3111 and a surrounding plate 3112. The bottom plate 3111 abuts against the mounting piece 313. The surrounding plate 3112 is annular and extends from the bottom plate 3111 away from the mounting piece 313.

[0039] The middle part of the second insulating piece 312 is provided with a hollow part 3121. The two ends of the second insulating piece 312 are respectively provided with a groove 3122 and a notch 3123. Since the second insulating piece 312 will shrink during the thermoplastic process, the hollow part 3121, the groove 3122, and the notch 3123 are arranged to reduce the volume of the solid part and reduce the shrinkage of the second insulating piece 312.

[0040] The conductive piece 32 includes a cell connecting part 321 and a power supply assembly part 322. The cell connecting part 321 and the power supply assembly part 322 respectively abut against the two sides of the base 31. The cell connecting part 321 passes through the base 31 and is connected to the power supply assembly part 322. A pair of cell connecting parts 321 are respectively connected to the positive electrode lug 21 and the negative electrode lug 22. By arranging the conductive piece 32 in two parts, the manufacturing difficulty of the conductive piece 32 is reduced.

[0041] The first insulating piece 311 abuts between the mounting piece 313 and the power supply assembly part 322 to realize the insulating abutment between the power supply assembly part 322 and the base 31. The second insulating piece 312 abuts between the mounting piece 313 and the cell connecting part 321 to realize the insulating abutment between the cell connecting part 321 and the base 31.

[0042] The base 31 is provided with a through hole 314, so that the cell connecting part 321 can pass through the base 31 and be connected with the power supply assembly part 322. Specifically, the through hole 314 includes a first through hole 3141 provided on the first insulating piece 311, a second through hole 3142 provided on the second insulating piece 312, and a third through hole 3143 provided on the mounting piece 313. The first through hole 3141, the second through hole 3142, and the third through hole 3143 are arranged in alignment.

[0043] The cell connecting part 321 includes a plate 3211 and a plurality of poles 3212. The poles 3212 extend from the plate 3211, pass through the base 31, and are connected with the power supply assembly part 322. Specifically, the poles 3212 pass through the third through hole 3143, the second through hole 3142, and the first through hole 3141 in sequence and are connected with the power supply assembly part 322.

[0044] By arranging a plurality of poles 3212, the overcurrent area of the conductive piece 32 is increased, the internal resistance is reduced, the temperature rise is reduced, and the safety of the battery is improved. In the present embodiment, the number of poles 3212 is two. The cell connecting part 321 can be integrally formed. In other embodiments, the number of poles 3212 is not limited.

[0045] Please refer to Figure 7 As shown, the plate 3211 is provided with a base section 3213 and an extension section 3214. The poles 3212 are arranged on the base section 3213. The extension section 3214 extends from the base section 3213 towards another plate 3211. By arranging the extension section 3214, the connection area of the plate 3211 and the cell 20 is increased, the overcurrent area of the conductive piece 32 is further improved, and the safety of the battery is improved.

[0046] In the present embodiment, the poles 3212 are cylindrical. The cylindrical poles 3212 are easy to produce and manufacture, and the stress distribution is more uniform when stressed, improving the structural strength of the conductive piece 32. In other embodiments, the specific shape of the poles 3212 is not limited.

[0047] The poles 3212 are provided with a fixing groove 3215 connected with the power supply assembly part 322. By arranging the fixing groove 3215 to mount the power supply assembly part 322, the structure is simple, easy to manufacture, and can ensure a certain positioning accuracy. In the present embodiment, the fixing groove 3215 is annular, so that the stress distribution of the poles 3212 is more uniform, improving the structural strength of the conductive piece 32.

[0048] The power supply assembly portion 322 is provided with a fixing hole 3220. The pole 3212 is assembled to the fixing hole 3220 through the through hole 314. The pole 3212 is riveted to the power supply assembly portion 322, and has high strength. The power supply assembly portion 322 includes a main body 3221 and a flange 3222 extending from the main body 3221. The flange 3222 is abutted and installed with the surrounding plate 3112. The first insulating member 311 includes the power supply assembly portion 322, so as to ensure the insulation effect between the power supply assembly portion 322 and the mounting member 313.

[0049] Please refer to Figure 8 and Figure 9 shown, Figure 8 and Figure 9 shows a structural diagram of the cover plate assembly 30 in another embodiment. In this embodiment, the middle part of the second insulating member 312 is provided with a separation portion 3124, so as to separate the positive electrode lug 21 and the negative electrode lug 22. The two ends of the second insulating member 312 are provided with a supporting leg 3125, which is used for fixedly connecting with the shell 10. The mounting member 313 is provided with a liquid injection hole 3131, which is used for injecting electrolyte into the inside of the battery.

[0050] The second aspect of the present application provides a battery pack, which includes the above-mentioned battery. Since the battery has high safety, the battery pack of the present application has high stability.

[0051] The third aspect of the present application provides a vehicle, which includes the above-mentioned battery pack. Since the battery pack of the present application has high stability, the vehicle of the present application has high reliability. The vehicle of the present application can be an electric vehicle or a hybrid vehicle, and the specific type is not limited.

[0052] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of the present application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery, characterized by, The battery comprises a shell, an electric core, a pair of cover plate assemblies and an explosion-proof valve. The electric core is installed in the interior of the shell, and a pair of the cover plate assemblies are fixed to two ends of the shell respectively, and the explosion-proof valve is arranged between the two ends of the shell. The cover plate assembly comprises a base and a pair of conductive pieces, and the electric core is provided with a positive electrode lug and a negative electrode lug at each end, and a pair of the conductive pieces are connected with the positive electrode lug and the negative electrode lug respectively. The conductive piece comprises an electric core connecting portion and a power supply assembly portion which are insulated and abutted on both sides of the base respectively.

2. The battery of claim 1, wherein, The electric core connecting portion is connected with the power supply assembly portion through the base, and a pair of the electric core connecting portions are connected with the positive electrode lug and the negative electrode lug respectively. The electric core connecting portion comprises a polar plate and a plurality of polar columns, and the polar columns extend through the base from the polar plate and are connected with the power supply assembly portion.

3. The battery of claim 2, wherein, The polar plate is provided with a base section and an extension section, the polar column is arranged on the base section, and the extension section extends from the base section towards another polar plate.

4. The battery of claim 3, wherein, The polar column is in a cylindrical shape.

5. The battery of claim 3, wherein, The polar column is provided with a fixing groove connected with the power supply assembly portion.

6. The battery of claim 3, wherein, The fixing groove is in an annular shape.

7. The battery of claim 6, wherein, The shell comprises a pair of first side plates arranged oppositely and a pair of second side plates connected with two ends of the pair of first side plates respectively, the area of the first side plate is smaller than that of the second side plate, and the explosion-proof valve is arranged on the first side plate.

8. The battery of claim 1, wherein, The battery comprises a shell, an electric core, a pair of cover plate assemblies and an explosion-proof valve.

9. A battery pack, characterized by, The battery comprises a shell, an electric core, a pair of cover plate assemblies and an explosion-proof valve. The battery comprises a shell, an electric core, a pair of cover plate assemblies and an explosion-proof valve.

10. A vehicle characterized by comprising: ​ ​

Images