Multipole battery

Abstract

The application relates to the technical field of batteries, in particular to a multi-pole group battery, which comprises a battery shell, a battery cover plate, a pole column, an electrode adapter plate, a plurality of pole groups and an insulating film. The electrode adapter plate comprises a pole column connecting area and a plurality of pole group connecting areas, the plurality of pole group connecting areas are arranged side by side at a preset distance along the thickness direction of the battery shell, and the length extension direction of the pole column connecting area is perpendicular to the length extension direction of the pole group connecting area. The plurality of pole groups are connected with the plurality of pole group connecting areas respectively. In application, the side-by-side arranged pole group connecting areas can provide assembly of the plurality of pole groups, avoid interference of adjacent pole groups in space, and improve assembly efficiency. Moreover, the pole group connecting areas arranged side by side along the thickness direction of the battery shell on the electrode adapter plate can save the space in the height direction of the battery shell, thereby improving the space utilization in the battery shell and equivalently improving the battery energy density. The insulating film can wrap and protect the entire pole group, and realize the insulation effect.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to multi-pole batteries. Background Technology

[0002] The energy storage sector (residential and commercial) and the new energy vehicle sector have an urgent need for low-cost, highly stable energy storage power sources. While lithium-ion batteries are widely used, their long-term development is limited by the scarcity of lithium resources and fluctuations in raw material prices. Sodium-ion batteries, on the other hand, are becoming the next-generation energy storage power source to replace lithium-ion batteries due to abundant sodium resources and significant cost advantages, aligning with industry development trends.

[0003] As market demands for battery energy density increase, improving the capacity of individual battery cells has become a core objective. Increasing the external dimensions is a direct path, and the width and height can be expanded through mold optimization, a technology that is already mature. However, how to assemble more electrode groups within a single battery cell is a technical problem that needs to be solved in this field. Utility Model Content

[0004] In view of this, this application provides a multi-electrode battery that can assemble multiple electrode groups in the battery casing while saving height space, thereby improving the battery energy density.

[0005] In a first aspect, this application provides a multi-electrode battery, comprising: a battery casing; a battery cover plate, fitted onto the cover plate opening of the battery casing; electrode posts, disposed on the battery cover plate; an electrode adapter plate, including an electrode post connection area and multiple electrode group connection areas, wherein the electrode post connection area is connected to the electrode post, and the multiple electrode group connection areas are spaced apart by a predetermined distance and arranged side by side along the thickness direction of the battery casing; multiple electrode groups, respectively connected to the multiple electrode group connection areas; and an insulating film, covering the outer surface of the electrode group array formed by the multiple electrode groups.

[0006] In conjunction with the first aspect, in one possible implementation, the number of electrode adapter pieces is multiple, and the multiple electrode adapter pieces include positive electrode adapter pieces and negative electrode adapter pieces; the multiple electrode posts include positive electrode posts and negative electrode posts, the positive electrode adapter pieces are connected to the positive electrode posts, and the negative electrode adapter pieces are connected to the negative electrode posts; the positive electrode group connection area of ​​the positive electrode adapter piece is connected to the positive electrode tab group of the electrode group, and the negative electrode group connection area of ​​the negative electrode adapter piece is connected to the negative electrode tab group of the electrode group.

[0007] In conjunction with the first aspect, in one possible implementation, it further includes: a positioning element having a positioning notch, the positioning element being disposed on the side of the battery cover facing the electrode assembly and connected to the electrode post, the electrode post connection area being mutually positioned and connected to the positioning element.

[0008] In conjunction with the first aspect, in one possible implementation, the electrode connection area is strip-shaped; the first surfaces of the two electrode connection areas located on both sides are coplanar with the second surfaces of the electrode post connection area; the third surfaces of the electrode connection areas located within both sides are non-coplanar with the second surfaces of the electrode post connection area; the first distance between the third surface and the battery cover is greater than the second distance between the first surface and the battery cover.

[0009] In conjunction with the first aspect, in one possible implementation, the difference between the first distance and the second distance is greater than the thickness of the tab group of the pole group.

[0010] In conjunction with the first aspect, one possible implementation further includes: a cover plate lower bracket disposed on the side of the battery cover plate facing the electrode group; wherein the positioning member is located on the side of the cover plate lower bracket facing the electrode group; the cover plate lower bracket has a protrusion, the position of which corresponds to the position of the explosion-proof valve of the battery cover plate.

[0011] In conjunction with the first aspect, in one possible implementation, the insulating film includes a first notch, a second notch, and a third notch, wherein the position of the first notch corresponds to the position of the protrusion, the position of the second notch corresponds to the position of the positioning member, and the position of the third notch corresponds to the position of the liquid injection hole on the battery cover.

[0012] In conjunction with the first aspect, in one possible implementation, the insulating film includes a first film surface, a second film surface, a third film surface, and a fourth film surface, wherein the first film surface and the second film surface respectively cover two opposite side surfaces of the electrode array, the third film surface covers the bottom surface of the electrode array away from the battery cover, and the fourth film surface covers the third film surface.

[0013] In conjunction with the first aspect, in one possible implementation, pre-fold lines are provided between adjacent film surfaces of the insulating film.

[0014] In conjunction with the first aspect, in one possible implementation, the number of positive electrode plates in the electrode group is greater than 30, and the number of negative electrode plates in the electrode group is one more than the number of positive electrode plates.

[0015] In application, the parallel-arranged electrode connection areas of this invention allow for the assembly of multiple electrode groups, preventing spatial interference between adjacent electrode groups and improving assembly efficiency. Furthermore, the parallel-arranged electrode connection areas along the thickness direction of the battery casing on the electrode adapter plate save space in the height direction of the battery casing, thereby improving space utilization within the battery casing and effectively increasing battery energy density. The insulating film can cover and protect the entire electrode array, achieving insulation. Attached Figure Description

[0016] Figure 1 The diagram shown is a structural schematic of an embodiment of this application when two pole groups are assembled.

[0017] Figure 2 The diagram shown is a structural schematic of an electrode adapter sheet provided in an embodiment of this application.

[0018] Figure 3 The diagram shown is a structural schematic of a battery cover provided in an embodiment of this application.

[0019] Figure 4 The diagram shown is a schematic representation of the assembly process provided in an embodiment of this application.

[0020] Figure 5 The diagram shown is a structural schematic of a battery cover provided in one embodiment of this application from another angle.

[0021] Figure 6 The diagram shown is a structural schematic of an electrode adapter sheet provided in an embodiment of this application.

[0022] Figure 7 The diagram shown is a schematic diagram of the connection between the electrode adapter and the electrode assembly provided in an embodiment of this application.

[0023] Figure 8 The diagram shown is a schematic diagram of the connection between the electrode adapter and the electrode assembly provided in another embodiment of this application.

[0024] Figure 9 The diagram shown is a structural schematic of the pole assembly after installation.

[0025] Figure 10 The diagram shown is a schematic representation of the insulating film. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] An example of a multi-pole battery pack is as follows: Figure 1 The diagram shown is a structural schematic of an embodiment of this application when two pole groups are assembled. Figure 2 The diagram shown is a structural schematic of an electrode adapter sheet provided in an embodiment of this application. Figure 3 The diagram shown is a structural schematic of a battery cover provided in one embodiment of this application. This application provides a multi-pole battery pack; in one embodiment, as shown... Figure 1 , 2As shown in Figure 3, the multi-electrode battery includes a battery casing, a battery cover plate 2, electrode posts 3, electrode adapter plates 4, multiple electrode groups 5, and an insulating film 6. The battery cover plate 2 is mounted on the cover opening of the battery casing, and the electrode posts 3 are disposed on the battery cover plate 2. The electrode adapter plate 4 includes an electrode post connection area 401 and multiple electrode group connection areas 402. The electrode post connection area 401 is connected to the electrode post 3. The multiple electrode group connection areas 402 are spaced apart by a preset distance and arranged side by side along the thickness direction of the battery casing. The length extension direction of the electrode post connection area 401 is perpendicular to the length extension direction of the electrode group connection area 402. The preset distance between the electrode group connection areas 402 can be set according to the thickness of the electrode group 5. Specifically, the distance between the geometric centers of adjacent electrode groups 5 is greater than or equal to the distance between the geometric centers of adjacent electrode group connection areas 402, so that the multiple electrode group connection areas 402 and the multiple electrode groups 5 correspond and match each other. Multiple electrode groups 5 are connected to multiple electrode group connection areas 402 respectively, and an insulating film 6 is covered on the outer surface of the electrode group array formed by the multiple electrode groups 5. The electrode adapter piece 4 can be made by stamping copper or aluminum plates, which has high production efficiency and low cost, and its thickness is greater than or equal to 0.5 mm.

[0028] In this embodiment, the parallel-arranged electrode connection areas 402 can accommodate multiple electrode groups 5, avoiding spatial interference between adjacent electrode groups and improving assembly efficiency. Furthermore, the parallel-arranged electrode connection areas 402 on the electrode adapter piece 4 along the thickness direction of the battery casing save space in the height direction of the battery casing, thereby improving the space utilization within the battery casing and effectively increasing the battery energy density. The insulating film 6 can cover and protect the entire electrode array, achieving insulation.

[0029] Figure 4 The diagram shown is a schematic representation of an assembly process according to an embodiment of this application. In one embodiment, as... Figure 4 As shown, there are multiple electrode adapter pieces 4, including a positive electrode adapter piece 410 and a negative electrode adapter piece 420. Multiple electrode posts 3 include positive and negative electrode posts. The positive electrode adapter piece 410 is connected to the positive electrode post, and the negative electrode adapter piece 420 is connected to the negative electrode post. The positive electrode group connection area of ​​the positive electrode adapter piece 410 is connected to the positive electrode tab group of the electrode group 5; this positive electrode group connection area is the electrode group connection area 402 corresponding to the positive electrode adapter piece 410. The negative electrode group connection area of ​​the negative electrode adapter piece 420 is connected to the negative electrode tab group of the electrode group 5; this negative electrode group connection area is the electrode group connection area 402 corresponding to the negative electrode adapter piece 420. In this embodiment, the positive electrode adapter 410 and the positive electrode post, and the negative electrode adapter 420 and the negative electrode post are connected respectively. Then, the positive electrode tab group and the positive electrode group connection area are connected, and the negative electrode tab group and the negative electrode group connection area are connected, thereby completing the electrode group electrical connection. Specifically, the positive electrode adapter 410 and the negative electrode adapter 420 are symmetrically distributed with the geometric center of the battery cover plate 2 as the center of symmetry.

[0030] Figure 5 The diagram shown is a structural schematic of a battery cover provided in one embodiment of this application from another angle. In one embodiment, as... Figure 5 As shown, the multi-electrode battery also includes a positioning component 7, which has a positioning notch 701. The positioning component 7 is disposed on the side of the battery cover 2 facing the electrode group 5 and connected to the electrode post 3. The electrode post connection area 401 is positioned and connected to the positioning component 7. In this embodiment, the positioning component 7 and its positioning notch 701 help to serve as a reference for accurate positioning when the electrode post connection area 401 and the positioning component 7 are welded together, thereby accurately connecting the electrode post connection area 401 at a predetermined position.

[0031] Figure 6 The diagram shown is a structural schematic of an electrode adapter sheet provided in an embodiment of this application. Figure 7 The diagram shown is a schematic diagram of the connection between the electrode adapter and the electrode assembly provided in an embodiment of this application. Figure 8 The diagram shown is a schematic representation of the connection between an electrode adapter and an electrode assembly according to another embodiment of this application. In one embodiment, as... Figure 6 As shown, the electrode connection area 402 is strip-shaped. The first surface 4021 of the two electrode connection areas 402 located on both sides is coplanar with the second surface 4011 of the electrode post connection area 401. The third surface 4022 of the electrode connection area 402 located on both sides is non-coplanar with the second surface 4011 of the electrode post connection area 401. The first distance between the third surface 4022 and the battery cover plate 2 is greater than the second distance between the first surface 4021 and the battery cover plate 2. Figure 7 As shown, Figure 6 and Figure 7 The observation directions are located on opposite sides of electrode adapter 4. Figure 7 Only the side edges of the first surface 4021 and the third surface 4022 are visible. When assembling the middle electrode group 5 within both sides of the electrode group row, the tabs 501 of these electrode groups 5 can extend from below the third surface 4022 into the area between the electrode group connection area 402 and the battery cover 2. Then, the tabs 501 and the electrode group connection area 402 are connected to each other. The electrode group connection area 402 can limit the tabs 501 from above to improve connection reliability. Figure 8 As shown, the electrode tabs 501 of the two sides of the electrode group 5 are connected to the electrode group connection area 402 from above the first surface 4021. The connection method above can reduce the connection difficulty.

[0032] In the actual installation process of pole group 5, refer to Figure 4 First, the insulating film 6 is positioned and connected to the battery cover plate 2. Then, the middle electrode group 5, which is located between the two sides of the electrode group, is laid flat and fixed with a tooling fixture. The electrode tab group 501 is inserted into the area between the electrode group connection area 402 and the battery cover plate 2 and then welded. After welding, the flattened electrode group 5 is stood up. Figure 8 The posture. (Refer to) Figure 8 Next, lay the two pole groups 5 on both sides of the pole group flat and fix them with tooling fixtures. Place the pole lugs on the first surface 4021 of the connection area 402 of the two pole groups on both sides for welding. After welding, stand the flattened pole groups 5 upright. Figure 9 The posture. Figure 9 The diagram shown is a structural schematic of the pole assembly after installation. Figure 9 The example in the text is four pole groups 5 and four pole group connection regions 402. Correspondingly, there are two middle pole groups 5 within the two sides.

[0033] In one embodiment, the difference between the first distance and the second distance is greater than the thickness of the tab group of the electrode group 5, so that the tab group 501 will not push the electrode group connection area 402 within both sides upward.

[0034] Specifically, such as Figure 3 and 5 As shown, the multi-pole battery pack also includes a cover plate under bracket 8, which is disposed on the side of the battery cover plate 2 facing the electrode group 5, thus preventing unnecessary electrical connections between the electrode group 5 and the battery cover plate 2. A positioning member 7 is located on the side of the cover plate under bracket 8 facing the electrode group 5 to position the connecting terminal post connection area 401. The cover plate under bracket 8 has a protrusion 801, the position of which corresponds to the position of the explosion-proof valve on the battery cover plate 2. The protrusion 801 provides sufficient redundancy for the explosion-proof valve to easily break open under high internal battery pressure.

[0035] Figure 10 The diagram shown is a schematic representation of the insulating film. In one embodiment, refer to... Figure 10 As shown, the insulating film 6 includes a first notch 601, a second notch 602, and a third notch 603. The position of the first notch 601 corresponds to the position of the protrusion 801, the position of the second notch 602 corresponds to the position of the positioning member 7, and the position of the third notch 603 corresponds to the position of the liquid injection hole 201 on the battery cover 2. In this embodiment, the first notch 601 cooperates with the protrusion 801, and the second notch 602 cooperates with the positioning member 7 to effectively fix the position of the insulating film 6 and prevent the insulating film 6 from dislodging. The third notch 603 is aligned with the liquid injection hole 201 for liquid injection. In the actual assembly process, before assembling the electrode group 5, the insulating film 6 is aligned with the positioning member 7 and the protrusion 801. After assembling the electrode group 5, the insulating film 6 is then wrapped around the electrode group.

[0036] Specifically, such as Figure 10As shown, the insulating film 6 includes a first film surface 604, a second film surface 605, a third film surface 606, and a fourth film surface 607. The first film surface 604 and the second film surface 605 respectively cover the two opposite side surfaces of the electrode array. The third film surface 606 covers the bottom surface of the electrode array away from the battery cover plate 2. The fourth film surface 607 covers the third film surface 606, thus providing 360-degree full coverage of the entire electrode array, improving insulation reliability. The entire wrapping process can be positioned through various notches without the need for complex tooling equipment. After the fourth film surface 607 covers the third film surface 606, the fourth film surface 607 is then fixed to the first film surface 604 at its edge by adhesive. This method allows for overall insulation wrapping of the electrode array 5 and the electrode tab group without the need to apply insulating tape, and leaves no adhesive residue on the electrode array 5. The entire insulation wrapping process is simple and reliable, effectively improving production efficiency.

[0037] Specifically, pre-fold lines are provided between adjacent film surfaces of the insulating film 6, which makes it easier to bend each film surface of the insulating film 6. The insulating film 6 can be made of one of PP, PE, or PET, and the thickness of the insulating film 6 is about 0.15mm.

[0038] Specifically, the number of positive electrode plates in electrode group 5 is greater than 30, and the number of negative electrode plates in electrode group 5 is one more than the number of positive electrode plates.

[0039] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0040] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0041] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0042] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features of the present invention.

[0043] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A multi-pole battery, characterized in that, include: Battery casing; Battery cover (2) is fitted onto the cover opening of the battery casing; The terminal post (3) is disposed on the battery cover plate (2); The electrode adapter (4) includes an electrode post connection area (401) and multiple electrode group connection areas (402). The electrode post connection area (401) is connected to the electrode post (3). The multiple electrode group connection areas (402) are spaced apart by a preset distance and arranged side by side along the thickness direction of the battery casing. Multiple pole groups (5) are respectively connected to multiple pole group connection regions (402); and An insulating film (6) is wrapped around the outer surface of the electrode array consisting of multiple electrode groups (5).

2. The multi-pole battery according to claim 1, characterized in that, The electrode adapter (4) includes a positive electrode adapter (410) and a negative electrode adapter (420). The terminal (3) includes a positive terminal and a negative terminal, the positive terminal adapter (410) is connected to the positive terminal, and the negative terminal adapter (420) is connected to the negative terminal; The positive electrode group connection area of ​​the positive electrode adapter (410) is connected to the positive electrode tab group of the electrode group (5), and the negative electrode group connection area of ​​the negative electrode adapter (420) is connected to the negative electrode tab group of the electrode group (5).

3. The multi-pole battery according to claim 1, characterized in that, Also includes: The positioning element (7) has a positioning notch (701). The positioning element (7) is disposed on the side of the battery cover (2) facing the electrode group (5) and connected to the electrode post (3). The electrode post connection area (401) is positioned and connected to the positioning element (7).

4. The multi-pole battery according to claim 1, characterized in that, The pole group connection area (402) is strip-shaped; The first surface (4021) of the two pole group connection areas (402) located on both sides is coplanar with the second surface (4011) of the pole post connection area (401); The third surface (4022) of the pole group connection area (402) located within the two sides is opposite to the second surface (4011) of the pole post connection area (401); The first distance between the third surface (4022) and the battery cover (2) is greater than the second distance between the first surface (4021) and the battery cover (2).

5. The multi-pole battery according to claim 4, characterized in that, The difference between the first distance and the second distance is greater than the thickness of the tab group of the electrode group (5).

6. The multi-pole battery according to claim 3, characterized in that, Also includes: The cover plate under bracket (8) is disposed on the side of the battery cover plate (2) facing the electrode group (5); The positioning element (7) is located on the side of the cover plate under bracket (8) facing the pole group (5); The cover plate under bracket (8) has a protrusion (801), the position of which corresponds to the position of the explosion-proof valve of the battery cover plate (2).

7. The multi-pole battery according to claim 6, characterized in that, The insulating film (6) includes a first notch (601), a second notch (602) and a third notch (603). The position of the first notch (601) corresponds to the position of the protrusion (801), the position of the second notch (602) corresponds to the position of the positioning member (7), and the position of the third notch (603) corresponds to the position of the liquid injection hole (201) on the battery cover (2).

8. The multi-pole battery according to claim 7, characterized in that, The insulating film (6) includes a first film surface (604), a second film surface (605), a third film surface (606), and a fourth film surface (607). The first film surface (604) and the second film surface (605) respectively cover two opposite side surfaces of the electrode array. The third film surface (606) covers the bottom surface of the electrode array away from the battery cover plate (2). The fourth film surface (607) covers the third film surface (606).

9. The multi-pole battery according to claim 8, characterized in that, The insulating film (6) has pre-folded lines between adjacent film surfaces.

10. The multi-pole battery according to claim 1, characterized in that, The number of positive electrode plates in the electrode group (5) is greater than 30, and the number of negative electrode plates in the electrode group (5) is one more than the number of positive electrode plates.

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