Battery cover plate, battery, battery pack and vehicle

Abstract

The utility model provides a battery cover plate, a battery, a battery pack and a vehicle. The battery cover plate comprises a base and a conductive piece mounted on the base, wherein the conductive piece is used for being connected with a tab of a battery. The base comprises a top surface and a bottom surface which are oppositely arranged, and a side surface connected with the top surface and the bottom surface; two ends of the conductive member respectively extend out of the top surface and the bottom surface. The base is provided with a liquid injection runner, and the liquid injection runner comprises a runner body, a liquid injection hole and a liquid passing hole, wherein the liquid injection hole and the liquid passing hole are located in the two ends of the runner body respectively. The liquid injection hole is formed in the side face, and the liquid through hole is formed in the bottom face. According to the battery cover plate, the liquid injection hole is formed in the side surface of the base, so that the conductive part can be avoided, overflowing electrolyte is prevented from polluting the conductive part, and the safety protection effect of the battery cover plate is improved.

Description

TECHNICAL FIELD

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

[0002] With the gradual development of vehicle technology, new energy vehicles have gradually become popular. As the energy storage element in new energy vehicles, the safety of batteries is increasingly valued. The end of the battery is provided with a battery cover plate, and the battery cover plate is fixed with a conductive part connected to the battery cell inside for external power supply. The battery cover plate is provided with a liquid injection hole for injecting electrolyte into the battery. At present, the safety protection effect of the battery cover plate is poor, and the electrolyte may overflow during the injection process, causing pollution to the conductive part and reducing the safety of the battery. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a battery cover plate, a battery, a battery pack and a vehicle to solve the related technical problems.

[0004] The first aspect of the present application provides a battery cover plate, comprising: a base and a conductive part mounted to the base, the conductive part being used to connect with the tab of the battery; the base comprises a top surface and a bottom surface arranged oppositely, and a side surface connecting the top surface and the bottom surface; both ends of the conductive part extend beyond the top surface and the bottom surface respectively; the base is provided with a liquid injection flow channel, the liquid injection flow channel comprising a flow channel main body and a liquid injection hole and a liquid passage hole located at both ends of the flow channel main body respectively; the liquid injection hole is arranged on the side surface, and the liquid passage hole is arranged on the bottom surface.

[0005] By arranging the liquid injection hole on the side surface of the base, on the one hand, the space utilization of the battery cover plate is improved, the integration of the battery cover plate is improved, the volume of the conductive part can be expanded, thereby increasing the flow area of the conductive part, reducing the internal resistance and reducing the temperature rise. On the other hand, the liquid injection hole is away from the conductive part, avoiding the pollution of the conductive part caused by the overflow of the electrolyte, and improving the safety protection effect of the battery cover plate.

[0006] Further, the liquid injection hole comprises a first part and a second part, the first part is recessed from the side surface, the second part communicates the first part and the flow channel main body, and the inner diameter of the first part is greater than that of the second part. The liquid injection hole is in a stepped shape, which facilitates the insertion of the liquid injection nozzle and improves the liquid injection efficiency. At the same time, in the subsequent sealing process, the stepped liquid injection hole can enable the sealing part to be installed to the liquid injection hole more accurately, improving the sealing performance.

[0007] Further, the inner diameter of the first portion gradually decreases in a direction towards the second portion; and / or, the inner diameter of the second portion gradually decreases in a direction towards the flow channel body. This arrangement further improves the convenience of the liquid injection nozzle and the sealing performance of the battery cover plate.

[0008] Further, the flow channel body extends from the liquid injection hole in a direction perpendicular to the axis of the liquid injection hole towards the liquid passage hole. This arrangement reduces the occupied volume of the liquid injection flow channel, further improving the space utilization of the battery cover plate.

[0009] Further, the flow channel body includes a flow channel section extending from the liquid injection hole to the liquid passage hole, and a buffer section extending from the liquid injection hole in a direction away from the liquid passage hole. By arranging the buffer section, the cross-section of the liquid injection flow channel expands at the buffer section, reducing the flow rate when electrolyte is injected, thereby reducing the impact generated.

[0010] Further, the conductive member includes a power supply assembly portion arranged on the top surface, and a battery cell connecting portion arranged on the bottom surface and connected to the power supply assembly portion through the base. By arranging the power supply assembly portion and the battery cell connecting portion on both sides of the base to form a whole, the connection with the battery cell is achieved, improving the integration of the battery cover plate.

[0011] Further, the number of conductive members is two, and the two conductive members are located on the same side of the liquid injection flow channel. By arranging two conductive members on the same side of the liquid injection flow channel, the liquid injection flow channel avoids the two conductive members, preventing electrolyte from contaminating the conductive members, and improving the safety protection performance of the battery cover plate.

[0012] Further, the power supply assembly portion is provided with a fixing hole, and the power supply assembly portion and the battery cell connecting portion are assembled and fixed through the fixing hole; the fixing holes of the two power supply assembly portions are arranged close to each other. Arranging the two fixing holes close to each other away from the liquid injection hole on the side surface prevents the conductive member from affecting the structure of the liquid injection flow channel during installation, improving the structural stability.

[0013] Further, the base includes a first insulating member, a second insulating member, and a mounting member clamped and fixed between the first insulating member and the second insulating member, the power supply assembly portion is mounted on the first insulating member, and the battery cell connecting portion is mounted on the second insulating member. By clamping and fixing the mounting member with the first insulating member and the second insulating member, the structural strength of the base is improved. Mounting the power supply assembly portion to the first insulating member and the battery cell connecting portion to the second insulating member improves the insulation effect between the conductive member and the base, further ensuring the safety protection effect of the battery cover plate.

[0014] The second aspect of the present application provides a battery, comprising a shell, an electric core mounted to the inside of the shell, and the battery cover plate as described above mounted to the end of the shell, the electric core comprising a main body and a tab extending from the main body, and the conductive piece is electrically connected with the tab. Since the battery cover plate of the present application has high safety protection effect, the safety of the battery of the present application is improved.

[0015] The third aspect of the present application provides a battery pack, comprising the battery as described above. Since the battery of the present application has high safety, the battery pack of the present application has high stability.

[0016] The fourth aspect of the present application provides a vehicle, comprising the battery pack as described above. Since the battery pack of the present application has high stability, the safety of the vehicle of the present application for passengers is improved.

[0017] 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

[0018] The drawings herein are incorporated into the specification and form a 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.

[0019] Figure 1 is a structural diagram of a battery cover plate in an exemplary embodiment of the present application;

[0020] Figure 2 is Figure 1 is a partial structural diagram of the battery cover plate in another perspective view;

[0021] Figure 3 is Figure 1 is a sectional view of the battery cover plate in the present application;

[0022] Figure 4 is Figure 1 is a structural diagram of the battery cover plate in the present application from a top perspective view;

[0023] Figure 5 is a structural diagram of a battery in an exemplary embodiment of the present application;

[0024] Figure 6 is Figure 5 is a perspective exploded view of the battery in the present application;

[0025] Figure 7 is Figure 6 is a structural diagram of the explosion-proof valve cover plate in the present application.

[0026] The battery cover plate is provided with a liquid injection hole for injecting liquid into the battery. At present, the safety protection of the battery cover plate is poor, and during the liquid injection process of the battery, the electrolyte may overflow and contaminate the conductive part, reducing the safety of the battery. The present application provides a battery cover plate, a battery, a battery pack and a vehicle to solve the related technical problems. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments (or modes) of the present application will be described clearly and completely in combination with the drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0028] If the application embodiments involve directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are used only to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. in the application embodiments are used only for convenience of description, and cannot be understood as indicating or implying relative importance.

[0029] The battery cover plate is provided with a liquid injection hole for injecting liquid into the battery. At present, the safety protection of the battery cover plate is poor, and during the liquid injection process of the battery, the electrolyte may overflow and contaminate the conductive part, reducing the safety of the battery. The present application provides a battery cover plate, a battery, a battery pack and a vehicle to solve the related technical problems.

[0030] As shown in Figure 1 The first aspect of the present application provides a battery cover plate 1. The battery cover plate 1 comprises a base 10 and a conductive part 20 mounted to the base. The conductive part 20 is used to connect with the tab of the battery. In some embodiments, the battery cover plate 1 further comprises a spacer 40 for fixedly connecting with the shell of the battery.

[0031] The base 10 comprises a top surface 101, a bottom surface 102 and a side surface 103. The top surface 101 and the bottom surface 102 are oppositely arranged. The side surface 103 connects the top surface 101 and the bottom surface 102. The two ends of the conductive piece 20 extend beyond the top surface 101 and the bottom surface 102 respectively.

[0032] The base 10 is provided with a liquid injection channel 30. Please refer to FIGS. 1, 2 and 3 Figure 2 and Figure 3 together, the liquid injection channel 30 comprises a channel body 31 and a liquid injection hole 32 and a liquid passing hole 33 arranged at the two ends of the channel body 31 respectively. The liquid injection hole 32 is arranged on the side surface 103. The liquid passing hole 33 is arranged on the bottom surface 102.

[0033] By arranging the liquid injection hole 32 on the side surface 103 of the base 10, on the one hand, the space utilization of the battery cover plate 1 is improved, the integration of the battery cover plate 1 is improved, the volume of the conductive piece 20 can be expanded, thereby increasing the flow area of the conductive piece 20, reducing the internal resistance and reducing the temperature rise. On the other hand, by arranging the liquid injection hole 32 on the side surface 103, the conductive piece 20 can be avoided, and the pollution of the conductive piece 20 caused by the overflow of the electrolyte is avoided, thereby improving the safety protection effect of the battery cover plate 1.

[0034] The side surface 103 comprises a pair of first side surfaces 1031 oppositely arranged and a pair of second side surfaces 1032 connecting the pair of first side surfaces 1031. The first side surface 1031 is square. The second side surface 1032 is long strip-shaped. The liquid injection hole 32 is arranged on the first side surface 1031. The distance between the liquid injection hole 32 and the connection between the first side surface 1031 and the second side surface 1032 is greater than or equal to 3mm and less than or equal to 10mm.

[0035] The base 10 comprises a first insulating piece 11, a second insulating piece 12 and a mounting piece 13. The mounting piece 13 is clamped and fixed between the first insulating piece 11 and the second insulating piece 12. The first insulating piece 11 and the second insulating piece 12 clamp and fix the mounting piece 13, thereby improving the structural strength of the base.

[0036] The first insulating piece 11 wraps one end of the conductive piece 20 for insulation protection. The middle part of the second insulating piece 12 is provided with a hollow part 121 to reduce the volume shrinkage of the second insulating piece 12 during the thermoplastic process. The second insulating piece 12 is provided with an avoiding groove 122 at the end part to avoid the liquid passing hole 33.

[0037] The conductive piece 20 comprises a power supply assembly part 21 and a battery cell connecting part 22. The power supply assembly part 21 is arranged on the top surface 101, and the battery cell connecting part 22 is arranged on the bottom surface 102 and connected with the power supply assembly part 21 through the base 10. By arranging the power supply assembly part 21 and the battery cell connecting part 22 on both sides of the base 10, an integral whole is formed, the connection with the battery cell is realized, and the integration of the battery cover plate 1 is improved.

[0038] The power supply assembly part 21 is mounted on the first insulating part 11, and the cell connecting part 22 is mounted on the second insulating part 12. The insulation effect of the conductive part 20 relative to the base 10 is improved, further ensuring the safety protection effect of the battery cover plate 1.

[0039] The number of the conductive part 20 is set to two, and the two conductive parts 20 are located on the same side of the liquid injection channel 30. By setting the two conductive parts 20 on the same side of the liquid injection channel 30, the liquid injection channel 30 can further avoid the two conductive parts 20, avoiding the pollution of the electrolyte to the conductive part 20, and improving the safety protection performance of the battery cover plate.

[0040] The two conductive parts 20 can be connected to the positive electrode of the cell at the same time, or can be connected to the negative electrode of the cell at the same time. The two conductive parts 20 can also be connected to the positive electrode and the negative electrode of the cell respectively.

[0041] The power supply assembly part 21 is provided with a fixing hole 210. The power supply assembly part 21 and the cell connecting part 22 are assembled and fixed through the fixing hole 210. The cell connecting part 22 passes through the base 10 and is connected to the fixing hole 210 of the power supply assembly part 21. The fixing holes 210 of the two power supply assembly parts 21 are arranged close to each other.

[0042] The two fixing holes 210 are arranged close to each other, away from the liquid injection hole 32 of the side surface 103, to prevent the conductive part 20 from affecting the structure of the liquid injection channel 30 during installation, improving the structural stability.

[0043] Please refer to Figure 4 The overall length of the base 10 is L, the distance between the power supply assembly part 21 and the side surface of the base 10 is L1, the length of the power supply assembly part 21 is L2, and the distance between the two power supply assembly parts 21 is L3. The range of L1 is greater than or equal to 2mm and less than or equal to L / 4. The range of L2 is greater than or equal to 10mm and less than or equal to L / 2. The range of L3 is greater than or equal to 5mm and less than or equal to L / 3.

[0044] The cell connecting part 22 includes a pole plate 221 and a pole column 222. The pole column 222 extends from the pole plate 221. The pole plate 221 is used to connect the tab of the cell. The pole column 222 passes through the base 10 and is assembled to the fixing hole 210. Specifically, the power supply assembly part 21 and the cell connecting part 22 can be fixed by riveting, having high structural strength.

[0045] The channel body 31 extends from the liquid injection hole 32 to the liquid passage hole 33 along the direction perpendicular to the axis of the liquid injection hole 32. This arrangement reduces the occupied volume of the liquid injection channel 30, further improving the space utilization of the battery cover plate 1.

[0046] The flow channel body 31 comprises a flow channel section 311 and a buffer section 312. The flow channel section 311 extends from the liquid injection hole 32 to the liquid passing hole 33. The buffer section 312 extends from the liquid injection hole 32 in a direction away from the liquid passing hole 33. By arranging the buffer section 312, the cross section of the liquid injection flow channel 30 at the buffer section 312 is expanded, the flow rate of the electrolyte during injection is reduced, and the impact generated is reduced.

[0047] The liquid injection hole 32 comprises a first section 321 and a second section 322. The first section 321 is recessed from the side surface 103. The second section 322 is in communication with the first section 321 and the flow channel body 31. The inner diameter of the first section 321 is larger than the inner diameter of the second section 322.

[0048] The liquid injection hole 32 is in a stepped shape. On one hand, this facilitates the insertion of the liquid injection nozzle and improves the injection efficiency. On the other hand, during the subsequent sealing process, the stepped liquid injection hole 32 enables the sealing component to be accurately installed to the liquid injection hole, thereby improving the sealing performance. The recessed depth of the first section 321 is greater than or equal to 10 mm and less than or equal to 20 mm.

[0049] The inner diameter of the first section 321 gradually decreases in a direction towards the second section 322. The inner diameter of the second section 322 gradually decreases in a direction towards the flow channel body 31. This further improves the convenience of the insertion of the liquid injection nozzle and the sealing performance after the installation of the sealing component to the battery cover plate.

[0050] The initial inner diameter of the liquid injection hole 32 is large, which facilitates the insertion of the liquid injection nozzle. The liquid injection hole 32 gradually decreases in inner diameter to guide the liquid injection nozzle, thereby improving the convenience of the insertion of the liquid injection nozzle. At the same time, the sealing component can be in a reverse tapered shape. During the assembly of the sealing component along the liquid injection hole 32, the deformation of the sealing component acts on the inner side wall of the liquid injection hole 32, so that the connection between the sealing component and the liquid injection hole is more secure, thereby improving the sealing effect.

[0051] In other embodiments, only the inner diameter of the first section 321 gradually decreases in a direction towards the second section 322. Alternatively, only the inner diameter of the second section 322 gradually decreases in a direction towards the flow channel body 31.

[0052] Please refer to Figure 5 to Figure 6 As shown in the drawings, the second aspect of the present application provides a battery comprising a housing 50, an electric core 60 installed inside the housing 50, and the above-mentioned battery cover plate installed to the end of the housing 50. The electric core 60 comprises a main body 61 and a tab 62 extending from the main body 61, and the conductive component 20 is electrically connected to the tab 62. Since the battery cover plate 1 of the present application has high safety protection effect, the safety of the battery of the present application is improved.

[0053] At the same time, the injection hole 32 is located at the side of the battery cover plate 1, and the length of the battery does not affect the injection of the electrolyte and the sealing of the injection hole 32. When the electrolyte is injected through the injection hole 32 or the injection hole 32 is welded and sealed, the battery can be placed on the side so that the injection hole 32 faces upward, thereby improving the injection efficiency and the sealing and welding efficiency.

[0054] Please refer to Figure 7 As shown in the drawings, the battery is assembled with an explosion-proof valve cover plate 100 at one end away from the battery cover plate 1. The explosion-proof valve cover plate 100 is provided with an explosion-proof valve 200. The explosion-proof valve 200 is used for pressure release inside the battery. When the temperature of the battery is out of control and the internal pressure reaches a threshold value, the explosion-proof valve 200 is broken to ensure the safety of the battery.

[0055] The third aspect of the present application provides a battery pack comprising the battery described above. Since the battery of the present application has high safety, the battery pack of the present application has high stability.

[0056] The fourth aspect of the present application provides a vehicle comprising the battery pack described above. Since the battery pack of the present application has high stability, the safety of the vehicle of the present application for passengers is improved. The vehicle of the present application can be an electric vehicle or a hybrid vehicle, and the specific type is not limited.

[0057] 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 structure described in the above embodiments and shown in the 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 cover plate, characterized by, The battery cover plate comprises: a base and a conductive piece mounted to the base, the conductive piece being used to connect with a tab of a battery cell; the base comprises a top surface and a bottom surface arranged oppositely, and a side surface connecting the top surface and the bottom surface; two ends of the conductive piece extend beyond the top surface and the bottom surface, respectively; the base is provided with a liquid injection channel, the liquid injection channel comprising a channel main body and a liquid injection hole and a liquid passage hole arranged at two ends of the channel main body, respectively; the liquid injection hole is arranged on the side surface, and the liquid passage hole is arranged on the bottom surface.

2. The battery cover plate of claim 1, wherein, The liquid injection hole comprises a first part and a second part, the first part is recessed from the side surface, and the second part communicates the first part and the channel main body, the inner diameter of the first part is larger than the inner diameter of the second part.

3. The battery cover plate of claim 2, wherein, The inner diameter of the first part gradually decreases in the direction towards the second part; and / or, the inner diameter of the second part gradually decreases in the direction towards the channel main body.

4. The battery cover plate of claim 1, wherein, The channel main body is formed by extending from the liquid injection hole in the direction perpendicular to the axis of the liquid injection hole towards the liquid passage hole.

5. The battery cover plate of claim 4, wherein, The channel main body comprises a channel section extending from the liquid injection hole to the liquid passage hole, and a buffer section formed by extending from the liquid injection hole in the direction away from the liquid passage hole.

6. The battery cover plate of claim 1, wherein, The conductive piece comprises a power supply assembly part and a cell connecting part, the power supply assembly part is arranged on the top surface, and the cell connecting part is arranged on the bottom surface and connected with the power supply assembly part through the base.

7. The battery cover plate of claim 6, wherein, The number of the conductive pieces is two, and the two conductive pieces are arranged on the same side of the liquid injection channel.

8. The battery cover plate of claim 7, wherein, The power supply assembly part is provided with a fixing hole, the power supply assembly part and the cell connecting part are assembled and fixed through the fixing hole, and the fixing holes of the two power supply assembly parts are arranged close to each other.

9. The battery cover plate of claim 6, wherein, The base comprises a first insulating piece, a second insulating piece, and a mounting piece clamped and fixed between the first insulating piece and the second insulating piece; the power supply assembly part is mounted on the first insulating piece, and the cell connecting part is mounted on the second insulating piece.

10. A battery, characterized by The battery cover plate comprises: a housing, a cell mounted inside the housing, and a battery cover plate as claimed in any one of claims 1-9 mounted to an end of the housing, the cell comprising a main body and a tab extending from the main body, and the conductive piece being electrically connected with the tab.

11. A battery pack, characterized by The battery cover plate comprises: The battery as claimed in claim 10.

12. A vehicle characterized by comprising: The battery pack comprises: The battery pack as claimed in claim 11.

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