Battery cover plate assembly, assembled battery and power battery pack

Abstract

The utility model relates to a battery cover plate assembly, an assembled battery and a power battery pack, which are used for solving the technical problem that the total voltage and the power reserve of the power battery pack cannot be considered at the same time. The battery cover plate assembly is used for being arranged between the end faces of two shells, battery cells are arranged in the shells, a positive electrode lug and a negative electrode lug are formed, the battery cover plate assembly comprises two cover plate main bodies, the cover plate main bodies are provided with through holes through which injection molding materials flow, and the two cover plate main bodies are parallel to each other and are arranged at intervals along the central axis of the through holes; the cover plate main bodies are used for being fixedly connected with the shell in a sealed mode, the conductive column penetrates through the two through holes, the insulation injection molding body is embedded with the two cover plate main bodies and the conductive column through the through holes so that the two cover plate main bodies and the conductive column can be insulated from each other, and the insulation injection molding body can be inserted into the end face of the shell. And two end parts of the conductive column penetrate out of the insulating injection molding body and are respectively in conductive contact with the positive tab of one of the two shells and the negative tab of the other one of the two shells.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power batteries, and in particular, to a battery cover assembly, a battery pack, and a power battery pack. Background Art

[0002] The power and driving range of new energy vehicles require a power battery pack with a higher total voltage and power reserve. In the related art, due to the longer length of the blade battery, the blade battery can increase the power reserve of the power battery pack. At the same time, in order to increase the total voltage of the power battery pack, multiple blade batteries are usually connected in series.

[0003] However, due to the limited space left for the power battery pack inside the vehicle body, when the volume of the power battery pack is constant, the number of blade batteries that can be installed on the vehicle is small, and the total voltage of the power battery pack will be relatively low; and if multiple short batteries are connected in series, although it can ensure that the power battery pack has sufficient total voltage, the power reserve of the power battery pack is insufficient. In addition, the connection circuit / connection board used for series connection will also cause waste of space. Utility Model Content

[0004] The purpose of the present disclosure is to provide a battery cover assembly, a battery assembly and a power battery pack to solve the technical problem that the total voltage and power reserve of the power battery pack cannot be taken into account at the same time.

[0005] In order to achieve the above-mentioned purpose, the present disclosure provides a battery cover assembly, which is used to be arranged between the end faces of two shells, wherein a battery cell is arranged in the shell and a positive electrode ear and a negative electrode ear are formed. The battery cover assembly includes: two cover bodies, each of which is provided with a through hole for allowing injection molding material to flow through, the two cover bodies are parallel to each other and arranged at intervals along the central axis of the through hole, the two cover bodies are respectively used to be fixedly and sealedly connected to the two shells, a conductive column passes through the two through holes, and an insulating injection molding body is embedded with the two cover bodies and the conductive column through the through hole so that the two cover bodies and the conductive column are insulated from each other, the insulating injection molding body can be inserted into the end face of the shell, and the two ends of the conductive column pass through the insulating injection molding body, one of the two ends is used to be in conductive contact with the positive electrode ear of one of the two shells, and the other of the two ends is used to be in conductive contact with the negative electrode ear of the other of the two shells.

[0006] Optionally, the insulating injection-molded body includes: a sandwich portion, which is injection-molded between the inner side surfaces of the two cover plate bodies, a joining portion, which is arranged opposite to the sandwich portion along the central axis of the through hole and is attached to the outer side surface of the cover plate body, the joining portion is used to be inserted into the end surface of the shell, and a connecting portion, which is accommodated in the through hole and connected between the sandwich portion and the joining portion, and the connecting portion separates the conductive column from the through hole.

[0007] Optionally, a convex edge protruding outward from the insulating injection-molded body in the radial direction of the cover plate body is arranged on the outer periphery of the cover plate body, and a side surface of the convex edge is used for welding with the shell.

[0008] Optionally, the conductive column is made of aluminum.

[0009] Optionally, the conductive column includes a first conductive segment and a second conductive segment connected to each other, one of the two ends is arranged on the first conductive segment, the other of the two ends is arranged on the second conductive segment, the first conductive segment is made of aluminum, and the second conductive segment is made of copper.

[0010] Optionally, the surfaces of the cover plate body and the conductive column are provided with structures for engaging with the insulating injection-molded body.

[0011] Optionally, the surfaces of the cover plate body and the conductive pillars are provided with a microporous structure and / or a frosted structure.

[0012] On the basis of the above technical solution, the present disclosure also provides a combined battery, comprising: two shells, arranged in a colinear manner along the length direction of the shells, wherein a battery cell is arranged in the shells and a positive electrode ear and a negative electrode ear are formed, and the battery cover plate assembly in the above technical solution is arranged between the two shells and can electrically connect the positive electrode ear of one of the two shells with the negative electrode ear of the other.

[0013] Optionally, the shell is further provided with an end cover sealed with the shell, and the end cover is provided with a liquid injection hole and / or an explosion-proof valve.

[0014] On the basis of the above technical solution, the present disclosure further provides a power battery pack, comprising the combined battery in the above technical solution.

[0015] Through the above technical solution, by placing the two pre-treated cover bodies and the conductive column in the injection mold, and then injecting the insulating injection molding material into the injection mold, an insulating injection molding body that is interlocked with the two cover bodies and the conductive column can be formed, so that the various components in the battery cover assembly can be combined into one and kept insulated from each other by injection molding, so as to simplify the assembly process of the battery cover assembly. Through the battery cover assembly, it is possible to achieve the sealing of the shell and the relative fixation between the two shells by the fixed connection of the two cover bodies to the shell respectively, and the series connection of the battery cells between the two shells can be achieved through the conductive column, and the short circuit between the two shells can be avoided through the insulating injection molding body. In addition, because the battery cover assembly has a simple structure and a small volume, it can accommodate more batteries when the internal space of the power battery pack is certain, thereby taking into account the improvement of the total voltage and power reserve of the power battery pack. The combined battery provided by the present disclosure has the same technical effect as the battery cover assembly in the above technical solution. In order to avoid unnecessary repetition, it is not repeated here. The power battery pack provided in the present disclosure has the same technical effect as the combined battery in the above technical solution, and will not be described here in order to avoid unnecessary repetition.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0018] Figure 1 is a schematic diagram of the structure of a combined battery in a specific embodiment of the present disclosure;

[0019] Figure 2 is a structural schematic diagram of a battery cover assembly in a specific embodiment of the present disclosure;

[0020] Figure 3 is along Figure 2 A cross-sectional view taken along line AA, showing a first embodiment of a battery cover assembly;

[0021] Figure 4 yes Figure 2 An exploded view of a battery cover assembly is shown in FIG.

[0022] Figure 5 is along Figure 2 A cross-sectional view taken along line AA, showing a second embodiment of a battery cover assembly;

[0023] Figure 6 yes Figure 2An exploded view of the battery cover assembly is shown in FIG.

[0024] Description of Reference Numerals

[0025] 100-shell, 101-end cover, 102-liquid injection hole, 103-explosion-proof valve,

[0026] 10-Battery cover assembly,

[0027] 1-cover body, 11-through hole, 12-convex edge,

[0028] 2-insulation injection molding, 21-sandwich part, 22-connection part, 23-joining part,

[0029] 3-conductive column, 31-end, 301-first conductive segment, 302-second conductive segment. DETAILED DESCRIPTION

[0030] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0031] In the present disclosure, unless otherwise stated, directional words such as "inside" and "outside" generally refer to the inside and outside relative to the contour of the corresponding component itself. The terms "first" and "second" used in the present disclosure are to distinguish one element from another element and do not have order and importance. In addition, when the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0032] According to a specific embodiment of the present disclosure, a battery cover assembly is provided, referring to Figure 1 As shown, the battery cover assembly can be used to be arranged between the end faces of two shells 100, and a battery cell (not shown) can be arranged in the shell 100 to form a positive electrode ear (not shown) and a negative electrode ear (not shown), wherein the two shells 100 can be arranged in a colinear manner along the length direction of the shell 100.

[0033] refer to Figures 2 to 6 As shown, the battery cover assembly 10 may include two cover bodies 1 , a conductive column 3 and an insulating injection molded body 2 .

[0034] Among them, a through hole 11 for allowing the injection material to flow through can be provided on the cover body 1, and the two cover bodies 1 can be parallel to each other and arranged at intervals along the central axis of the through hole 11. The two cover bodies 1 can be used to be fixedly and sealedly connected to the two shells 100 respectively, so that the two shells 100 remain relatively fixed and at the same time form a seal on the inside of the shell 100.

[0035] The conductive column 3 can pass through the two through holes 11. The insulating injection molding 2 can be interlocked with the two cover plate bodies 1 and the conductive column 3 through the through holes 11, so that the two cover plate bodies 1 and the conductive column 3 are insulated from each other, and the insulating injection molding 2 can be inserted into the end surface of the shell 100 to form a seal in the middle of the shell 100. The two ends 31 of the conductive column 3 can pass through the insulating injection molding 2, one of the two ends 31 can be used for conductive contact with the positive pole ear of one of the two shells 100, and the other of the two ends 31 can be used for conductive contact with the negative pole ear of the other of the two shells 100. That is, the conductive column 3 can connect the cells in the two shells 100 in series, and the insulating injection molding 2 spaced between the conductive column 3 and the cover plate body 1 can prevent the pole ear of the shell 100 from contacting with the cover plate body 1 and causing a short circuit.

[0036] Before forming the insulating injection molding 2, the conductive column 3 and the two cover plate bodies 1 can be pre-treated so that the surfaces of the conductive column 3 and the two cover plate bodies 1 form a structure for being embedded with the insulating injection molding 2. For example, the surfaces of the conductive column 3 and the two cover plate bodies 1 can be formed with a microporous structure, or a frosted structure can be formed by sandblasting, so that the conductive column 3 and the two cover plate bodies 1 can be well combined with the injection molding material. Afterwards, the two cover plate bodies 1 can be placed in an injection mold (not shown), and the conductive column 3 passes through the two through holes 11. In the injection mold, the two cover plate bodies 1 are kept parallel to each other and arranged at intervals. By injecting insulating injection molding material into the injection mold, the injection molding material wraps the portion of the conductive column 3 located in the injection mold, and the injection molding material is embedded with the conductive column 3 and the two cover plate bodies 1 through the two through holes 11. Finally, the injection molding material can form the insulating injection molding 2, and the insulating injection molding 2, the two cover plates 1 and the conductive column 3 form a whole.

[0037] Through the above technical solution, by placing the two pre-treated cover bodies 1 and the conductive column 3 in the injection mold, and then injecting the insulating injection molding material into the injection mold, an insulating injection molding body 2 can be formed that is interlocked with the two cover bodies 1 and the conductive column 3, so that the various components in the battery cover assembly 10 can be combined into one and kept insulated from each other by injection molding, so as to simplify the assembly process of the battery cover assembly 10. Through the battery cover assembly 10, the sealing of the shell 100 and the relative fixation between the two shells 100 can be achieved by the fixed connection of the two cover bodies 1 to the shell respectively, and the series connection of the battery cells between the two shells 100 can be achieved through the conductive column 3, and the short circuit between the two shells 100 can be avoided through the insulating injection molding body 2. In addition, because the battery cover assembly 10 has a simple structure and a small volume, it can accommodate more batteries when the internal space of the power battery pack is fixed, thereby taking into account the improvement of the total voltage and power reserve of the power battery pack.

[0038] The insulating injection molded body 2 formed in the above manner may have the following structure. Specifically, the insulating injection molded body 2 may include a sandwich portion 21, a connecting portion 22 and two joining portions 23. The sandwich portion 21 may be injection molded between the inner side surfaces of the two cover plate bodies 1 (i.e., the two opposite sides of the two cover plate bodies 1), that is, the sandwich portion 21 may be formed by solidification of the injection material between the two cover plate bodies 1. The joining portion 23 may be arranged opposite to the sandwich portion 21 along the central axis of the through hole 11, and be attached to the outer side surface of the cover plate body 1 (i.e., the side surface of the cover plate body 1 facing the shell 100 connected thereto), that is, the joining portion 23 may be formed by solidification of the injection material injected between the outer side surface of the cover plate body 1 and the inner wall of the injection mold, and the two joining portions 23 may be respectively inserted into the end surfaces of the two shells 100 to form a seal in the middle of the shell 100. The connection portion 22 may be received in the through hole 11 and connected between the interlayer portion 21 and the bonding portion 23 . The connection portion 22 may separate the conductive pillar 3 from the through hole 11 , so that the conductive pillar 3 and the cover plate body 1 are insulated from each other.

[0039] In order to facilitate the fixed and sealed connection between the cover body 1 and the housing 100, refer to Figure 3 and Figure 5 As shown, a flange 12 protruding outward from the insulating injection molding body 2 along the radial direction of the cover body 1 may be provided on the outer periphery of the cover body 1, and the flange 12 may surround the cover body 1 along the circumference of the cover body 1, and the side of the flange 12 facing the shell 100 may be used for welding with the shell 100, so that a fixed and sealed connection is formed between the shell 100 and the cover body 1.

[0040] When the cells in the two shells 100 are both sodium ion cells, as the first embodiment of the battery cover assembly 10 of the present disclosure, refer to Figure 3 and Figure 4 As shown, the conductive column 3 can be made of aluminum to facilitate welding with the electrode tab of the sodium battery made of aluminum.

[0041] When the cells in the two shells 100 are both sodium ion cells, as the second embodiment of the battery cover assembly 10 of the present disclosure, refer to Figure 5 and Figure 6As shown, the conductive column 3 can be made of copper-aluminum composite. Specifically, the conductive column 3 can include a first conductive segment 301 and a second conductive segment 302 connected to each other, one of the two ends 31 is arranged on the first conductive segment 301, and the other of the two ends 31 is arranged on the second conductive segment 302. The first conductive segment 301 can be made of aluminum, and the end 31 arranged on the first conductive segment 301 is used for welding with a positive electrode ear made of aluminum of a lithium battery. The second conductive segment 302 can be made of copper, and the end 31 arranged on the second conductive segment 302 is used for welding with a negative electrode ear made of copper of another lithium battery.

[0042] Based on the above technical solution, the present disclosure also provides a battery pack, referring to Figure 1 As shown, the assembled battery may include the battery cover assembly 10 and two shells 100 in the above technical solution, and a battery cell (not shown) may be arranged in the shell 100 to form a positive electrode ear (not shown) and a negative electrode ear (not shown), wherein the two shells 100 may be arranged in a colinear manner along the length direction of the shell 100, and the battery cover assembly 10 may be arranged between the end faces of the two shells 100, and may electrically connect the positive electrode ear of one of the two shells 100 with the negative electrode ear of the other, so that the battery cell in one shell 100 is connected in series with the battery cell in the other shell 100.

[0043] Through the above technical solution, the assembled battery provided by the present disclosure has the same technical effect as the battery cover assembly in the above technical solution, and in order to avoid unnecessary repetition, it will not be described here.

[0044] As a specific embodiment of the present disclosure, the cells in the two shells 100 can be sodium ion cells, and the positive and negative tabs of the sodium ion cells are made of aluminum. Figure 3 and Figure 4 As shown, the conductive column 3 of the battery cover assembly 10 can be made of aluminum to facilitate welding with the tab of the sodium ion battery cell.

[0045] As another specific embodiment of the present disclosure, the cells in the two shells 100 can be lithium-ion cells, the positive electrode tabs of the sodium-ion cells are made of aluminum, and the negative electrode tabs are made of copper. Figure 5 and Figure 6As shown, the conductive column 3 can be made of a copper-aluminum composite. Specifically, the conductive column 3 can include a first conductive segment 301 and a second conductive segment 302 that are connected. One of the two ends 31 is arranged on the first conductive segment 301, and the other of the two ends 31 is arranged on the second conductive segment 302. The first conductive segment 301 can be made of aluminum, and the end 31 arranged on the first conductive segment 301 is used for welding with the positive electrode ear of the sodium ion battery cell in one shell 100. The second conductive segment 302 can be made of copper, and the end 31 arranged on the second conductive segment 302 is used for welding with the negative electrode ear of the sodium ion battery cell in another shell 100.

[0046] In addition, since the battery cover assembly 10 disposed between the two housings 100 cannot be provided with a liquid injection hole and an explosion-proof valve, Figure 1 As shown, each housing 100 may be provided with an end cover 101 sealed with the housing 100 , and the end cover 101 may be provided with a liquid injection hole 102 and / or an explosion-proof valve 103 to ensure the safety and reliability of the assembled battery.

[0047] On the basis of the above technical solution, the present disclosure further provides a power battery pack, comprising the combined battery in the above technical solution.

[0048] Through the above technical solution, the power battery pack provided by the present disclosure has the same technical effect as the combined battery in the above technical solution, and in order to avoid unnecessary repetition, it will not be described here.

[0049] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0050] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0051] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A battery cover assembly, characterized in that: Used to be arranged between the end faces of two shells, wherein a battery cell is arranged in the shell and a positive electrode ear and a negative electrode ear are formed, and the battery cover plate assembly includes: Two cover plate bodies, each of which is provided with a through hole for the injection molding material to flow through, the two cover plate bodies are parallel to each other and arranged at intervals along the central axis of the through hole, and the two cover plate bodies are respectively used to be fixedly and sealingly connected to the two housings, A conductive column passing through the two through holes, and The insulating injection molding body is embedded with the two cover plate bodies and the conductive column through the through hole so that the two cover plate bodies and the conductive column are insulated from each other. The insulating injection molding body can be inserted into the end surface of the shell, and the two ends of the conductive column pass through the insulating injection molding body, one of the two ends is used for conductive contact with the positive electrode ear of one of the two shells, and the other of the two ends is used for conductive contact with the negative electrode ear of the other of the two shells.

2. The battery cover assembly according to claim 1, characterized in that: The insulating injection molded body comprises: The sandwich part is injection molded between the inner sides of the two cover plate bodies. a joint portion, arranged along the central axis of the through hole opposite to the sandwich portion and attached to the outer side of the cover body, the joint portion being used to be inserted into the end surface of the shell, and A connecting portion is received in the through hole and connected between the interlayer portion and the bonding portion, wherein the connecting portion separates the conductive column from the through hole.

3. The battery cover assembly according to claim 1, characterized in that: A convex edge protruding outwardly from the insulating injection molded body along the radial direction of the cover plate body is arranged on the outer periphery of the cover plate body, and the side surface of the convex edge is used for welding with the shell.

4. The battery cover assembly according to claim 1, characterized in that: The conductive column is made of aluminum.

5. The battery cover assembly according to claim 1, characterized in that: The conductive column includes a first conductive segment and a second conductive segment connected to each other, one of the two ends is arranged on the first conductive segment, and the other of the two ends is arranged on the second conductive segment, the first conductive segment is made of aluminum, and the second conductive segment is made of copper.

6. The battery cover assembly according to claim 1, characterized in that: The surfaces of the cover plate body and the conductive column are provided with structures for being embedded with the insulating injection-molded body.

7. The battery cover assembly according to claim 6, characterized in that: The surfaces of the cover plate body and the conductive column are provided with a microporous structure and / or a frosted structure.

8. A battery pack, characterized in that: include: Two shells are arranged in a colinear manner along the length direction of the shells, and the shells are provided with a battery cell and are formed with a positive electrode ear and a negative electrode ear, and The battery cover plate assembly according to any one of claims 1 to 7 is arranged between the end faces of the two shells and is capable of electrically connecting the positive electrode ear of one of the two shells to the negative electrode ear of the other.

9. The assembled battery according to claim 8, characterized in that: The shell is also provided with an end cover which is sealed with the shell, and the end cover is provided with a liquid injection hole and / or an explosion-proof valve.

10. A power battery pack, characterized in that: A battery assembly comprising the battery assembly according to claim 8 or 9.

Images