Power battery cover plate assembly and power battery

Abstract

The utility model discloses a power battery cover plate assembly and a power battery. The power battery cover plate assembly comprises a cover plate and a lower plastic plate located below the cover plate, the top surface of the cover plate is partially recessed to form a first groove, and the top surface of the lower plastic plate is partially recessed to form a second groove corresponding to the first groove; and the cover plate and the lower plastic plate are embedded into the second groove through the first groove to realize connection. The first groove is formed in the cover plate and matched with the corresponding second groove in the lower plastic plate, so that the lower plastic plate and the cover plate are assembled and positioned, the machining efficiency is higher, the machining cost is low, the cover plate assembly with the design reserves more design spaces for the two sides of the positive electrode connecting piece / the negative electrode connecting piece, and the cover plate assembly is convenient to use. The contact area of the battery cover plate and the battery core pole group can be increased, and the battery core pole group is prevented from shaking up and down.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a power battery cover plate assembly and a power battery. Background Art

[0002] The power battery is mainly composed of a battery cover, a battery shell, a connecting piece, a battery pole group, etc. The battery cover is connected to the battery pole group through a battery connecting piece. The battery cover is composed of a bare aluminum plate, positive and negative poles, positive and negative rubber sleeves, a sealing ring, a lower plastic plate, etc. In the prior art, the lower plastic plate and the bare aluminum plate are generally connected by ultrasonic welding and the poles are connected up and down. At the same time, bosses are designed on both sides of the lower plastic plate, and reinforcing ribs are arranged in the bosses. The bosses on both sides of the lower plastic plate are pressed on the pole group, and together with the wall of the battery shell, the freedom of the battery unit is limited. This scheme is cumbersome to design, the lower plastic plate is difficult to design and process, and the processing efficiency is low. At the same time, the contact area with the pole group is small, and the effect of limiting the freedom of the battery pole group up and down is poor. In addition, the battery connecting piece is designed with a connecting piece fuse structure, which fuses when the current increases sharply to improve the safety performance of the battery cell. However, in the prior art, the connecting piece fuse structure is arranged on the connecting piece body, which will occupy the connecting piece space and affect the welding area between the connecting piece and the pole ear. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned deficiencies and defects of the existing power battery cover plate and to provide a power battery cover plate assembly and a power battery.

[0004] In a first aspect of the utility model, a power battery cover plate assembly is provided, comprising a cover plate and a lower plastic plate located below the cover plate, wherein the top surface of the cover plate is formed with a first groove by local concave, and the top surface of the lower plastic plate is formed with a second groove by local concave at a position corresponding to the first groove; the cover plate and the lower plastic plate are connected by embedding the first groove into the second groove.

[0005] There are two first grooves, which are symmetrically arranged on the cover plate.

[0006] The middle part of the cover plate is provided with a vent hole for exhausting the gas when the internal pressure of the battery is too high, and is also provided with a liquid injection port for injecting electrolyte.

[0007] Wherein, the lower plastic plate is provided with a vent at a position corresponding to the air release port, and is provided with a through hole at a position corresponding to the liquid injection port.

[0008] Among them, the cover plate is arranged with a positive through hole and a negative through hole, the positive through hole is provided with a conductive positive injection rubber sleeve above and a positive sealing ring below; the negative through hole is provided with a negative injection rubber sleeve above and a negative sealing ring below; a positive pole post is provided above the positive sealing ring; a negative pole post is provided above the negative sealing ring; the positive pole post passes through the positive sealing ring, the cover plate and the lower plastic plate, and is connected to the cover plate by injection molding through the positive injection rubber sleeve; the negative pole post passes through the negative sealing ring, the cover plate and the lower plastic plate, and is connected to the cover plate by injection molding through the negative injection rubber sleeve.

[0009] Wherein, the lower plastic plate is respectively provided with a lower plastic plate positive electrode through hole and a lower plastic plate negative electrode through hole at positions corresponding to the positive electrode through hole and the negative electrode through hole.

[0010] Among them, a positive connecting plate is connected to the bottom of the positive electrode column; a negative connecting plate is connected to the bottom of the negative electrode column, and the positive connecting plate and the negative connecting plate are U-shaped structural plates, and the side connected to the battery cell is a U-shaped sheet part, and the side connected to the positive electrode column / negative electrode column is a round head sheet part.

[0011] The positive electrode connecting piece is provided with a fuse structure, which is an opening formed in the middle of the bend of the U-shaped positive electrode connecting piece, separating the U-shaped sheet portion from the round head sheet portion at the bent arc portion.

[0012] Wherein, the fuse part of the positive electrode connecting piece is covered with a fuse structure protection rubber sleeve.

[0013] A second aspect of the present invention provides a power battery, comprising the power battery cover plate assembly provided by the first aspect of the present invention.

[0014] The utility model realizes assembly positioning of the lower plastic plate and the cover plate by arranging a first groove on the cover plate to cooperate with the corresponding second groove on the lower plastic plate, so as to achieve higher processing efficiency and lower processing cost. Moreover, under this design, the cover plate assembly reserves more design space on both sides of the positive electrode connecting plate / negative electrode connecting plate, which can increase the contact area between the battery cover plate and the battery cell electrode group and avoid up and down shaking of the battery cell electrode group.

[0015] The utility model reasonably utilizes the space at the bending part of the connecting piece and arranges a fuse structure at the bending part of the positive connecting piece, which can reduce the design size of the positive connecting piece and reduce the production cost of the positive connecting piece of the battery, while not affecting the welding area of ​​the positive connecting piece and the pole ear. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the explosion and decomposition of the power battery cover assembly provided by the utility model.

[0017] Figure 2This is a cross-sectional view of the power battery cover assembly provided by the utility model.

[0018] Figure 3 A schematic diagram of the cover plate structure of the power battery cover plate assembly provided by the utility model.

[0019] Figure 4 This is a schematic diagram of the lower plastic plate structure of the power battery cover assembly provided by the utility model.

[0020] Figure 5 This is a schematic diagram of the positive electrode connecting piece structure of the power battery cover assembly provided by the utility model. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] like Figures 1 to 5 As shown, in the first aspect of an embodiment of the utility model, a power battery cover plate assembly is provided, including a cover plate 100 and a lower plastic plate 200 located below the cover plate, the cover plate has a first groove for positioning and connecting the lower plastic plate 200, and the lower plastic plate has a second groove at a position corresponding to the first groove; the cover plate and the lower plastic plate are connected by embedding the first groove into the second groove.

[0023] The utility model realizes the assembly positioning of the lower plastic plate and the cover plate by arranging a first groove on the cover plate to cooperate with the corresponding second groove on the lower plastic plate. Compared with the traditional method of bosses on both sides of the lower plastic plate, the utility model has higher processing efficiency and lower processing cost. At the same time, more space is reserved on both sides of the positive / negative electrode connecting sheet, and the contact area with the battery cell electrode group can be increased to avoid shaking of the electrode group.

[0024] In a preferred embodiment, there are two first grooves, which are symmetrically arranged on the cover plate 100, and specifically can be a positive electrode side groove 122 located on the positive electrode side and a negative electrode side groove 122 located on the negative electrode side. Correspondingly, two second grooves are respectively arranged at corresponding positions on the lower plastic plate 200, namely, the positive electrode side groove 222 of the lower plastic plate and the negative electrode side groove 212 of the lower plastic plate.

[0025] In a preferred embodiment, see Figure 2As shown, the middle part of the cover plate has a venting port 101 for exhausting when the internal pressure of the battery is too high, and is provided with a liquid injection port 102 for injecting electrolyte, the lower plastic plate is provided with a vent 201 at a position corresponding to the venting port, and is provided with a through hole 202 at a position corresponding to the liquid injection port; wherein, an explosion-proof safety valve 3 is arranged below the venting port 101 and between the lower plastic plate.

[0026] Furthermore, in one embodiment, a positive electrode through hole 121 and a negative electrode through hole 111 are arranged on the cover plate, and a conductive positive electrode injection molding rubber sleeve 21 is concentrically arranged above the positive electrode through hole, and a positive electrode sealing ring 22 is concentrically arranged below the positive electrode through hole; a negative electrode injection molding rubber sleeve 11 is concentrically arranged above the negative electrode through hole 111, and a negative electrode sealing ring 12 is arranged below; a positive electrode column 23 is arranged above the positive electrode sealing ring; a negative electrode column 13 is arranged above the negative electrode sealing ring; the positive electrode column passes through the positive electrode sealing ring, the cover plate, and the lower plastic plate, and is connected to the cover plate by injection molding through the positive electrode injection molding rubber sleeve; the negative electrode column passes through the negative electrode sealing ring, the cover plate, and the lower plastic plate, and is connected to the cover plate by injection molding through the negative electrode injection molding rubber sleeve.

[0027] As a preferred embodiment, the cover plate is a plain aluminum plate, which is a common flat battery cover plate. In view of the fact that existing batteries are prone to electrochemical corrosion, in order to prevent the battery from electrochemical corrosion, it is necessary to increase the potential of the battery shell. The utility model uses a positive electrode injection plastic sleeve with conductive energy performance after adding a conductive agent in the positive electrode injection plastic, so that the battery shell has positive charge, which increases the overall potential of the battery shell, prevents the risk of electrochemical corrosion between the aluminum battery shell and the electrolyte at low potential, and reduces the risk of electrochemical corrosion of the battery shell.

[0028] The lower plastic plate 200 is provided with a lower plastic plate positive electrode through hole 221 and a lower plastic plate negative electrode through hole 211 at positions corresponding to the positive electrode through hole and the negative electrode through hole, respectively.

[0029] Among them, the positive electrode column 23 is connected to the positive electrode connecting sheet 241 below; the negative electrode column is connected to the negative electrode connecting sheet 14 below, and the positive electrode connecting sheet and the negative electrode connecting sheet are U-shaped structural sheets, and the side connected to the battery cell is a U-shaped sheet part, and the side connected to the positive electrode column / negative electrode column is a round head sheet part.

[0030] Among them, the positive electrode connecting piece is provided with a fuse structure 2411, which melts when the current is too large to play a protective role. Preferably, the fuse structure is an opening formed in the middle of the bend of the U-shaped positive electrode connecting piece, separating the U-shaped sheet portion and the round head sheet portion at the bent arc portion. The fuse structure is provided at the bend of the connecting piece, which can reduce the design size of the connecting piece without affecting the welding area of ​​the positive electrode connecting piece and the battery ear.

[0031] Among them, the fuse part of the positive electrode connecting piece is covered with a fuse structure protection rubber sleeve 242 to protect the fuse structure, and the positive electrode connecting piece is provided with a fuse structure protection rubber sleeve connection hole 2412, and the fuse structure protection rubber sleeve 242 is fixed to the fuse part of the positive electrode connecting piece by a pin that cooperates with the fuse structure protection rubber sleeve connection hole 2412.

[0032] A second aspect of an embodiment of the present utility model provides a power battery, comprising the power battery cover plate assembly provided by the first aspect of the present utility model.

[0033] The power battery of the present application has grooves on both sides of the middle part of the battery cover, which has higher processing efficiency and lower processing cost than the traditional method of designing bosses on both sides of the lower plastic plate. At the same time, more space is reserved on both sides of the positive and negative connecting pieces, and the contact area with the electrode group can be increased to avoid shaking of the electrode group. A fuse structure is provided at the bending part of the connecting piece, which can reduce the design size of the connecting piece without affecting the welding area between the connecting piece and the pole ear.

[0034] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model.

[0035] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A power battery cover assembly, characterized in that: It includes a cover plate and a lower plastic plate located below the cover plate, wherein the top surface of the cover plate is partially concave to form a first groove, and the top surface of the lower plastic plate is partially concave to form a second groove at a position corresponding to the first groove; the cover plate and the lower plastic plate are connected by embedding the first groove into the second groove.

2. The power battery cover plate assembly according to claim 1, characterized in that: There are two first grooves, which are symmetrically arranged on the cover plate.

3. The power battery cover plate assembly according to claim 1, characterized in that: The middle part of the cover plate is provided with a venting port for exhausting the gas when the internal pressure of the battery is too high, and is also provided with a liquid injection port for injecting electrolyte.

4. The power battery cover plate assembly according to claim 3, characterized in that: The lower plastic plate is provided with a vent at a position corresponding to the air release port, and is provided with a through hole at a position corresponding to the liquid injection port.

5. The power battery cover plate assembly according to claim 1, characterized in that: The cover plate is provided with a positive through hole and a negative through hole, wherein a conductive positive injection-molded rubber sleeve is disposed above the positive through hole and a positive sealing ring is disposed below the positive through hole; a negative injection-molded rubber sleeve is disposed above the negative through hole and a negative sealing ring is disposed below the negative through hole; a positive pole post is disposed above the positive sealing ring; a negative pole post is disposed above the negative sealing ring; the positive pole post passes through the positive sealing ring, the cover plate and the lower plastic plate, and is connected to the cover plate by injection molding through the positive injection-molded rubber sleeve; the negative pole post passes through the negative sealing ring, the cover plate and the lower plastic plate, and is connected to the cover plate by injection molding through the negative injection-molded rubber sleeve.

6. The power battery cover plate assembly according to claim 5, characterized in that: The lower plastic plate is provided with a lower plastic plate positive electrode through hole and a lower plastic plate negative electrode through hole at positions corresponding to the positive electrode through hole and the negative electrode through hole, respectively.

7. The power battery cover plate assembly according to claim 5, characterized in that: A positive connecting plate is connected below the positive pole; a negative connecting plate is connected below the negative pole. The positive connecting plate and the negative connecting plate are U-shaped structural plates, and the side connected to the battery cell is a U-shaped sheet portion, and the side connected to the positive pole / negative pole is a round head sheet portion.

8. The power battery cover plate assembly according to claim 7, characterized in that: The positive electrode connecting piece is provided with a fuse structure, which is an opening formed in the middle of the bend of the U-shaped positive electrode connecting piece, separating the U-shaped sheet portion from the round head sheet portion at the bent arc portion.

9. The power battery cover plate assembly according to claim 8, characterized in that: The fuse portion of the positive electrode connecting piece is sheathed with a fuse structure protection rubber sheath.

10. A power battery, characterized in that: Comprising the power battery cover plate assembly according to any one of claims 1 to 9.

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