Battery cover plate assembly, combined battery, and power battery pack

Abstract

A battery cover plate assembly, a combined battery, and a power battery pack. The battery cover plate assembly is used for being arranged between end faces of two housings. A battery cell is arranged in each housing, and the housing is provided with a positive tab and a negative tab. The battery cover plate assembly comprises a cover plate main body, a conductive post, and an insulating injection-molded body. The cover plate main body is used for being fixedly and sealingly connected to the two housings and is provided with a through hole allowing for an injection molding material to flow through. The conductive post passes through the through hole. The insulating injection-molded body is mutually embedded with the cover plate main body and the conductive post by means of the through hole so that the cover plate main body and the conductive post are insulated from each other. The insulating injection-molded body is capable of being inserted into the end face of each housing. Two ends of the conductive post protrude from the insulating injection-molded body and are in conductive contact with the positive tab of one of the two housings and the negative tab of the other of the two housings, respectively.

Description

Battery cover assembly, battery pack and power battery pack

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 202420902545.0, filed on April 26, 2024, entitled “Battery Cover Assembly, Combined Battery and Power Battery Pack”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of power battery technology, specifically to a battery cover assembly, a battery pack, and a power battery pack. Background Technology

[0004] In related technologies, because blade batteries are relatively long, they can increase the energy storage 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.

[0005] However, due to the limited space available for the power battery pack inside the vehicle, the number of blade batteries that can be installed is relatively small, and the total voltage of the power battery pack will be relatively low. If multiple short batteries are connected in series, although it can ensure that the power battery pack has sufficient total voltage, the power battery pack's electrical reserves are insufficient. In addition, the connection circuits / connection boards used for series connection will also cause space waste. Summary of the Invention

[0006] The purpose of this disclosure is to provide a battery cover assembly, a combined battery, and a power battery pack to solve the technical problem of the inability to simultaneously achieve the desired total voltage and electrical storage in a power battery pack.

[0007] To achieve the above objectives, this disclosure provides a battery cover assembly for placement between the end faces of two housings, wherein a battery cell is disposed within the housings and positive and negative tabs are formed. The battery cover assembly includes: a cover body having a through hole for allowing injection molding material to flow through; the cover body being fixedly and sealingly connected to the two housings; a conductive post passing through the through hole; and an insulating injection molded body that engages with the cover body and the conductive post through the through hole, such that the cover body and the conductive post are insulated from each other. The insulating injection molded body can be inserted into the end face of the housings, and two ends of the conductive post protrude from the insulating injection molded body. One of the two ends is used for conductive contact with the positive tab of one of the two housings, and the other end is used for conductive contact with the negative tab of the other of the two housings.

[0008] Optionally, the insulating injection molded body includes: two joint portions arranged opposite to each other along the central axis of the through hole and respectively attached to two sides of the cover plate body, and a connecting portion accommodated in the through hole and connected between the two joint portions, wherein the connecting portion spacees the conductive post from the through hole.

[0009] Optionally, a protruding edge is provided on the outer periphery of the cover plate body, which protrudes radially outward from the insulating injection molded body, and the two sides of the protruding edge are respectively used for welding to the two shells.

[0010] Optionally, the conductive post is made of aluminum.

[0011] Optionally, the conductive post includes a first conductive segment and a second conductive segment connected together, one of the two ends is disposed on the first conductive segment, and the other of the two ends is disposed on the second conductive segment, wherein the first conductive segment is made of aluminum and the second conductive segment is made of copper.

[0012] Optionally, the surfaces of the cover plate body and the conductive post are provided with structures for fitting into the insulating injection molded body.

[0013] Optionally, the surfaces of the cover plate body and the conductive pillar are provided with a microporous structure and / or a frosted structure.

[0014] Based on the above technical solutions, this disclosure also provides a combined battery, comprising: two housings arranged collinearly along the length direction of the housings, each housing containing a battery cell and forming a positive electrode tab and a negative electrode tab, and a battery cover plate assembly as described in the above technical solutions, disposed between the end faces of the two housings, and capable of electrically connecting the positive electrode tab of one of the two housings to the negative electrode tab of the other.

[0015] Optionally, the housing is further provided with an end cap that is sealed to the housing, and the end cap is provided with a liquid injection hole and / or an explosion-proof valve.

[0016] Based on the above technical solutions, this disclosure also provides a power battery pack, including the combined battery in the above technical solutions.

[0017] Through the above technical solution, by placing the pre-treated cover plate body and conductive pillars in an injection mold, and then injecting insulating injection molding material into the injection mold, an insulating injection molded body that fits into the cover plate body and conductive pillars can be formed. Thus, through injection molding, the various components of the battery cover plate assembly can be integrated and kept insulated from each other, simplifying the assembly process of the battery cover plate assembly. This battery cover plate assembly achieves sealing of the housing and relative fixation between the two housings through the fixed connection between the cover plate body and the housing. It also enables series connection of the cells between the two housings through the conductive pillars and prevents short circuits between the two housings through the insulating injection molded body. Furthermore, due to the simple structure and small size of this battery cover plate assembly, a larger number of batteries can be accommodated within a given internal space of the power battery pack, thereby improving both the total voltage and energy storage of the power battery pack. The combined battery provided in this disclosure has the same technical effects as the battery cover plate assembly in the above technical solution, and will not be described in detail here to avoid unnecessary repetition. The power battery pack provided in this disclosure has the same technical effects as the combined battery in the above technical solution, and will not be described in detail here to avoid unnecessary repetition. Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 is a schematic diagram of the combined battery structure in a specific embodiment of this disclosure;

[0020] Figure 2 is a structural schematic diagram of the battery cover assembly in a specific embodiment of this disclosure;

[0021] Figure 3 is a cross-sectional view along line AA in Figure 2, showing a first embodiment of the battery cover assembly;

[0022] Figure 4 is an exploded view of Figure 2, showing a first embodiment of the battery cover assembly;

[0023] Figure 5 is a cross-sectional view along line AA in Figure 2, showing a second embodiment of the battery cover assembly;

[0024] Figure 6 is an exploded view of Figure 2, showing a second embodiment of the battery cover assembly.

[0025] Explanation of reference numerals in the attached drawings: 100-shell, 101-end cap, 102-injection hole, 103-explosion-proof valve, 10-battery cover assembly, 1-cover body, 11-through hole, 12-protruding edge, 2-insulating injection molded body, 22-connecting part, 23-joining part, 3-conductive post, 31-end, 301-first conductive segment, 302-second conductive segment. Detailed Implementation

[0026] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0027] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" generally refer to the inner or outer contour relative to the corresponding component's own outline. The terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not indicate sequence or importance. Furthermore, when the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0028] According to a specific embodiment of the present disclosure, a battery cover assembly is provided. Referring to FIG1, the battery cover assembly can be used to be disposed between the end faces of two housings 100. A battery cell (not shown) can be disposed in the housing 100, and a positive electrode tab (not shown) and a negative electrode tab (not shown) are formed. The two housings 100 can be arranged collinearly along the length direction of the housings 100.

[0029] Referring to Figures 2 to 6, the battery cover assembly 10 may include a cover body 1, a conductive post 3, and an insulating injection molded body 2.

[0030] The cover plate body 1 may be provided with a through hole 11 for the injection molding material to flow through. The cover plate body 1 may be used to fix and seal the two housings 100 so that the two housings 100 remain relatively fixed and the interior of the housings 100 is sealed.

[0031] The conductive post 3 can pass through the through hole 11. The insulating injection molded body 2 can be fitted with the cover plate body 1 and the conductive post 3 through the through hole 11, so that the cover plate body 1 and the conductive post 3 are insulated from each other. The insulating injection molded body 2 can be inserted into the end face of the housing 100 to form a seal in the middle of the housing 100. The two ends 31 of the conductive post 3 can protrude from the insulating injection molded body 2. One of the two ends 31 can be used to make conductive contact with the positive electrode tab of one of the two housings 100, and the other end 31 can be used to make conductive contact with the negative electrode tab of the other of the two housings 100. That is, the conductive post 3 can connect the cells in the two housings 100 in series, and the insulating injection molded body 2, which is spaced between the conductive post 3 and the cover plate body 1, can prevent the electrode tab of the housing 100 from contacting the cover plate body 1 and causing a short circuit.

[0032] Before forming the insulating injection molded body 2, the conductive pillar 3 and the cover plate body 1 can be pre-treated to form a structure on the surface of the conductive pillar 3 and the cover plate body 1 for fitting with the insulating injection molded body 2. For example, the surface of the conductive pillar 3 and the cover plate body 1 can be formed with a microporous structure, or a frosted structure can be formed by sandblasting, so that the conductive pillar 3 and the cover plate body 1 can be well bonded with the injection molding material. Then, the cover plate body 1 can be placed into the injection mold (not shown), and the conductive pillar 3 can pass through two through holes 11. By injecting insulating injection molding material into the injection mold, the injection molding material can wrap the part of the conductive pillar 3 located in the injection mold, and the injection molding material can fit with the conductive pillar 3 and the cover plate body 1 through the through holes 11. Finally, the injection molding material can form the insulating injection molded body 2, and the insulating injection molded body 2, the cover plate 1, and the conductive pillar 3 can be formed into a whole.

[0033] Through the above technical solution, by placing the pre-treated cover plate body 1 and conductive post 3 in an injection mold, and then injecting insulating injection molding material into the injection mold, an insulating injection molded body 2 that fits into the cover plate body 1 and conductive post 3 can be formed. Thus, through injection molding, the various components in the battery cover plate assembly 10 can be integrated and kept insulated from each other, simplifying the assembly process of the battery cover plate assembly 10. This battery cover plate assembly 10 can achieve sealing of the housing 100 and relative fixation between the two housings 100 through the fixed connection between the cover plate body 1 and the housing, and can also achieve series connection of the cells between the two housings 100 through the conductive post 3. Furthermore, the insulating injection molded body 2 can prevent short circuits between the two housings 100. In addition, because the battery cover plate assembly 10 has a simple structure and small size, it can accommodate a larger number of batteries within a given internal space of the power battery pack, thereby improving the total voltage and energy storage of the power battery pack.

[0034] The insulating injection molded body 2 formed in the above manner can have the following structure. Specifically, the insulating injection molded body 2 can include two joint portions 23 and a connecting portion 22 connecting the two joint portions 23. The two joint portions 23 can be arranged opposite each other along the central axis of the through hole 11 and respectively adhere to two sides of the cover plate body 1 (i.e., the sides of the cover plate body 1 facing the housing 100). That is, the joint portions 23 can be formed by the solidification of injection molding material injected between the two sides of the cover plate body 1 and the inner wall of the injection mold. The two joint portions 23 can be inserted into the end faces of the two housings 100 to form a seal in the middle of the housings 100. The connecting portion 22 can be accommodated in the through hole 11, and the connecting portion 22 can space the conductive post 3 from the through hole 11 so that the conductive post 3 and the cover plate body 1 remain insulated.

[0035] To facilitate a fixed and sealed connection between the cover plate body 1 and the housing 100, as shown in Figures 3 and 5, a protruding edge 12 that extends radially outward from the insulating injection molded body 2 can be provided on the outer periphery of the cover plate body 1. The protruding edge 12 can surround the cover plate body 1 circumferentially. The two housings 100 are located on both sides of the protruding edge 12, and the two sides of the protruding edge 12 can be used to weld to the two housings 100, so that a fixed and sealed connection is formed between the housing 100 and the cover plate body 1.

[0036] When both housings 100 contain sodium-ion cells, as a first embodiment of the battery cover assembly 10 of this disclosure, referring to Figures 3 and 4, the conductive post 3 can be made of aluminum to facilitate welding with the aluminum tabs of the sodium battery.

[0037] When both housings 100 contain sodium-ion batteries, as a second embodiment of the battery cover assembly 10 of this disclosure, referring to Figures 5 and 6, the conductive post 3 can be made of copper-aluminum composite. Specifically, the conductive post 3 may include a first conductive segment 301 and a second conductive segment 302 connected together. One of the two ends 31 is disposed in the first conductive segment 301, and the other of the two ends 31 is disposed in the second conductive segment 302. The first conductive segment 301 may be made of aluminum, and the end 31 disposed in the first conductive segment 301 is used for welding to a positive electrode tab of a lithium battery made of aluminum. The second conductive segment 302 may be made of copper, and the end 31 disposed in the second conductive segment 302 is used for welding to a negative electrode tab of another lithium battery made of copper.

[0038] Based on the above technical solutions, this disclosure also provides a combined battery. Referring to FIG1, the combined battery may include the battery cover assembly 10 and two housings 100 as described in the above technical solutions. The housings 100 may be provided with cells (not shown) and form positive tabs (not shown) and negative tabs (not shown). The two housings 100 may be arranged collinearly along the length direction of the housings 100. The battery cover assembly 10 may be disposed between the end faces of the two housings 100 and may electrically connect the positive tab of one housing 100 to the negative tab of the other housing 100, so that the cells in one housing 100 are connected in series with the cells in the other housing 100.

[0039] The combined battery provided in this disclosure has the same technical effect as the battery cover assembly in the above technical solution. To avoid unnecessary repetition, it will not be described in detail here.

[0040] In one specific embodiment of this disclosure, the battery cells in both housings 100 can be sodium-ion batteries, and the positive and negative tabs of the sodium-ion batteries are both made of aluminum. Accordingly, referring to Figures 3 and 4, the conductive posts 3 of the battery cover assembly 10 can be made of aluminum to facilitate welding to the tabs of the sodium-ion batteries.

[0041] In another specific embodiment of this disclosure, the battery cells in both housings 100 can be lithium-ion battery cells. The positive electrode tab of the lithium-ion battery cell is made of aluminum, and the negative electrode tab is made of copper. Accordingly, referring to Figures 5 and 6, the conductive post 3 can be made of copper-aluminum composite. Specifically, the conductive post 3 can include a first conductive segment 301 and a second conductive segment 302 connected together. One of the two ends 31 is disposed in the first conductive segment 301, and the other of the two ends 31 is disposed in the second conductive segment 302. The first conductive segment 301 can be made of aluminum, and the end 31 disposed in the first conductive segment 301 is used to weld to the positive electrode tab of the lithium-ion battery cell in one housing 100. The second conductive segment 302 can be made of copper, and the end 31 disposed in the second conductive segment 302 is used to weld to the negative electrode tab of the lithium-ion battery cell in the other housing 100.

[0042] Furthermore, since it is impossible to provide a liquid injection hole and an explosion-proof valve on the battery cover assembly 10 located between the two housings 100, as shown in FIG1, each housing 100 may also be provided with an end cap 101 that is sealed to the housing 100. The end cap 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 combined battery.

[0043] Based on the above technical solutions, this disclosure also provides a power battery pack, including the combined battery in the above technical solutions.

[0044] The power battery pack provided in this disclosure has the same technical effect as the combined battery in the above technical solution. To avoid unnecessary repetition, it will not be described in detail here.

[0045] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0046] 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, this disclosure will not describe the various possible combinations separately.

[0047] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A battery cover assembly, characterized in that, For placement between the end faces of two housings (100), wherein a battery cell is disposed in the housing (100) and a positive electrode tab and a negative electrode tab are formed, the battery cover assembly (10) includes: The cover plate body (1) is provided with a through hole (11) for allowing injection molding material to flow through. The cover plate body (1) is used to be fixedly and sealingly connected to the two housings (100). The conductive post (3) passes through the through hole (11), and An insulating injection molded body (2) is fitted into the cover plate body (1) and the conductive post (3) through the through hole (11) so that the cover plate body (1) and the conductive post (3) are insulated from each other. The insulating injection molded body (2) can be inserted into the end face of the housing (100). The two ends (31) of the conductive post (3) protrude from the insulating injection molded body (2). One of the two ends (31) is used to make conductive contact with the positive electrode tab of one of the two housings (100), and the other end (31) is used to make conductive contact with the negative electrode tab of the other of the two housings (100).

2. The battery cover assembly according to claim 1, characterized in that, The insulating injection molded body (2) includes: Two joint portions (23) are arranged opposite each other along the central axis of the through hole (11) and respectively fit against the two sides of the cover plate body (1). A connecting portion (22) is accommodated in the through hole (11) and connected between the two joining portions (23), the connecting portion (22) separating the conductive post (3) from the through hole (11).

3. The battery cover assembly according to claim 1 or 2, characterized in that, The outer periphery of the cover plate body (1) is provided with a protruding edge (12) that protrudes radially outward from the insulating injection molded body (2) along the cover plate body (1), and the two sides of the protruding edge (12) are respectively used for welding to the two housings (100).

4. The battery cover assembly according to any one of claims 1 to 3, characterized in that, The conductive post (3) is made of aluminum.

5. The battery cover assembly according to any one of claims 1 to 4, characterized in that, The conductive post (3) includes a first conductive segment (301) and a second conductive segment (302) connected together. One of the two ends (31) is disposed in the first conductive segment (301) and the other of the two ends (31) is disposed in the second conductive segment (302). The first conductive segment (301) is made of aluminum and the second conductive segment (302) is made of copper.

6. The battery cover assembly according to any one of claims 1 to 5, characterized in that, The surfaces of the cover plate body (1) and the conductive post (3) are provided with structures for fitting into the insulating injection molded body (2).

7. The battery cover assembly according to claim 6, characterized in that, The surfaces of the cover plate body (1) and the conductive pillar (3) are provided with microporous structures and / or frosted structures.

8. A combined battery, characterized in that, include: Two housings (100) are arranged collinearly along the length of the housings (100). A battery cell is disposed within each housing (100), and positive and negative electrodes are formed therein. The battery cover assembly (10) according to any one of claims 1 to 7 is disposed between the end faces of the two housings (100) and is capable of electrically connecting the positive tab of one of the two housings (100) to the negative tab of the other.

9. The combined battery according to claim 8, characterized in that, The housing (100) is also provided with an end cap (101) that is sealed to the housing (100), and the end cap (101) is provided with a liquid injection hole (102) and / or an explosion-proof valve (103).

10. A power battery pack, characterized in that, Includes the combined battery as described in claim 8 or 9.

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