Laminated four-core lithium ion battery

Abstract

The utility model discloses a laminated four-core lithium ion battery, and belongs to the technical field of lithium ion batteries. An insulating layer is arranged on the inner wall of the battery shell, a laminated cell is arranged in the insulating layer, positive electrode connecting pieces and negative electrode connecting pieces are arranged at the upper end of the laminated cell, the two positive electrode connecting pieces are connected with a positive electrode protection piece, and the two negative electrode connecting pieces are connected with a negative electrode protection piece; the upper end face of the battery shell is connected with a battery cover, a positive terminal and a negative terminal are arranged on the battery cover, the positive terminal is connected with a positive protection sheet, and the negative terminal is connected with a negative protection sheet; and a partition plate is arranged between the two laminated battery cells. According to the utility model, the assembling and disassembling processes are simplified, and the working efficiency is improved; the partition plates and the laminated battery cells are distributed in a staggered manner, so that the internal structure of the battery is optimized, heat dissipation of the battery cells in the use process is promoted, and performance reduction or potential safety hazards caused by heat accumulation are reduced.

Description

Technical Field

[0001] This utility model relates to a stacked four-cell lithium-ion battery, belonging to the field of lithium-ion battery technology. Background Technology

[0002] In existing stacked four-cell lithium-ion battery technology, such as the Chinese utility model patent with the application date of December 2, 2021, application number CN202123040097.3 and title "Stacked Cell Connection Structure and Stacked Lithium Power Battery", the disclosed technical solution uses welding to assemble the cover plate and the battery casing.

[0003] While welding provides strong connections and ensures structural stability, the process requires precise and meticulous welding at every joint between the cover plate and the battery casing, undoubtedly increasing the complexity and workload for workers. Furthermore, as an irreversible connection method, welding makes it difficult to easily separate the cover plate from the battery casing once completed, causing significant inconvenience when subsequent inspection or maintenance of the internal battery cells is needed.

[0004] Secondly, the four cells in this technical solution are designed to be tightly fitted together. While this structure optimizes the battery's space utilization to some extent, it sacrifices the cells' heat dissipation performance during operation. Due to the lack of sufficient heat dissipation space or channels between the cells, the battery may face poor heat dissipation under prolonged or high-load operation, thereby affecting the battery's overall performance and lifespan. Utility Model Content

[0005] To address the problems existing in the background technology, this utility model provides a stacked four-cell lithium-ion battery.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a stacked four-cell lithium-ion battery, comprising a battery casing, a battery cover, stacked cells, an insulating layer, a positive electrode connecting piece, a positive electrode protection piece, a positive terminal, a negative terminal, a negative electrode connecting piece, and a negative electrode protection piece; the inner wall of the battery casing is provided with an insulating layer, and four stacked cells arranged side by side are placed in the insulating layer. Each stacked cell has a positive electrode connecting piece and a negative electrode connecting piece fixed to its upper end. The positive electrode connecting pieces of the two stacked cells on the left are connected to the corresponding positive electrode protection pieces, and the positive electrode connecting pieces of the two stacked cells on the right are connected to the corresponding positive electrode protection pieces. The positive terminal connecting tabs of the two stacked cells on the side are connected to the corresponding positive terminal protection tabs; the negative terminal connecting tabs of the two stacked cells on the left side are connected to the corresponding negative terminal protection tabs; and the negative terminal connecting tabs of the two stacked cells on the right side are connected to the corresponding negative terminal protection tabs. The upper end face of the battery casing is connected to the battery cover, on which positive and negative terminals are fixed. The positive terminal is connected to the positive terminal protection tab, and the negative terminal is connected to the negative terminal protection tab. A partition plate is inserted between each pair of adjacent stacked cells, and each partition plate has multiple through holes.

[0007] The upper surface of the battery casing is provided with a slot around its circumference, and the lower surface of the battery cover is provided with a plug fixed around its circumference. The plug is inserted into the slot in a matching manner, and there are connecting mechanisms on both the left and right sides of the plug. The connecting mechanisms are used to connect the plug to the battery casing.

[0008] A sealing ring is provided on the outer wall of the lower end of the insert.

[0009] Each of the connecting mechanisms includes a spring, a connecting block, and a screw; the left and right side walls of the battery casing are provided with mounting grooves, and each mounting groove and the corresponding position of the insert block are provided with threaded holes and mounting holes. The middle part of the connecting block is fixedly connected to one end of the spring, and the end of the connecting block is limited and rotatably connected to the non-threaded end of the corresponding screw. The spring is set in the mounting hole and its other end abuts against the insert block. The screw is screwed into the corresponding threaded hole.

[0010] The outer side of the connecting block is covered with a sealing cover, which is fixedly engaged with the corresponding mounting groove.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This invention achieves flexible connection and separation between the battery cover and the battery casing through a connecting mechanism, ensuring the sealing of the stacked cells and simplifying the assembly and disassembly process, providing great convenience for workers, especially when inspecting or replacing stacked cells, significantly improving work efficiency. Secondly, by using a staggered distribution of the separator plates and stacked cells, not only is the internal structure of the battery optimized, but heat dissipation during use is also promoted, reducing performance degradation or safety hazards caused by heat accumulation, and providing strong protection for the safe and efficient operation of lithium-ion batteries. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram showing the connection relationship between the laminated cells and the separator.

[0015] Figure 3 yes Figure 1 Structural diagram excluding the battery cover;

[0016] Figure 4 yes Figure 2 Top view;

[0017] Figure 5 yes Figure 1 Top view;

[0018] Figure 6 This is a schematic diagram showing the connection between the battery casing and the battery cover;

[0019] Figure 7 This is a schematic diagram of the connecting mechanism. Detailed Implementation

[0020] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0021] A stacked four-cell lithium-ion battery includes a battery casing 1, a battery cover 2, stacked cells 3, an insulating layer 4, a positive electrode connector 9, a positive electrode protection sheet 10, a positive terminal 11, a negative terminal 12, a negative electrode connector 13, and a negative electrode protection sheet 14. The inner wall of the battery casing 1 is fixedly provided with the insulating layer 4, which serves to insulate the cells 3. Four stacked cells 3 are placed side-by-side within the insulating layer 4. Each stacked cell 3 has a positive electrode connector 9 and a negative electrode connector 13 fixed to its upper end. The positive electrode connectors 9 of the two stacked cells 3 on the left are connected to the corresponding positive electrode protection sheets 10, and the positive electrode connectors 9 of the two stacked cells 3 on the right are connected to the corresponding positive electrode protection sheets 10. The positive electrode connecting piece 9 of the battery cell 3 is connected to the corresponding positive electrode protection piece 10. The negative electrode connecting pieces 13 of the two stacked battery cells 3 on the left are connected to the corresponding negative electrode protection pieces 14, and the negative electrode connecting pieces 13 of the two stacked battery cells 3 on the right are connected to the corresponding negative electrode protection pieces 14. The upper end face of the battery casing 1 is connected to the battery cover 2. The battery cover 2 is fixed with a positive terminal 11 and a negative terminal 12. The positive terminal 11 is connected to the positive electrode protection piece 10, and the negative terminal 12 is connected to the negative electrode protection piece 14. The positive terminal 11 provides a platform for connecting the lithium battery to the positive power source, and the negative terminal 12 provides a platform for connecting the lithium battery to the negative power source. A partition plate 5 matching the size of the stacked battery cell 3 is inserted between each pair of adjacent stacked battery cells 3. Each partition plate 5 has multiple through holes arranged in an array extending through its thickness direction. In use, the partition plate 5 serves as heat insulation to prevent the propagation of thermal runaway.

[0022] The upper surface of the battery housing 1 has a slot 17 circumferentially arranged, and the lower surface of the battery cover 2 has a plug 16 fixedly arranged circumferentially. The plug 16 is inserted into the slot 17. Connecting mechanisms are provided on both the left and right sides of the plug 16. These connecting mechanisms are used to connect the plug 16 to the battery housing 1. By changing the connection relationship between the connecting mechanisms and the battery housing 1, the battery cover 2 can be disassembled and installed. The plug 16 serves to reinforce the position of the battery cover 2 when connected to the battery housing 1.

[0023] A sealing ring is provided on the outer wall of the lower end of the insert 16.

[0024] Each of the connecting mechanisms includes a spring 6, a connecting block 7, and a screw 8. The left and right sidewalls of the battery housing 1 are provided with mounting grooves. Each mounting groove and the corresponding position of the insert block 16 are provided with a threaded hole 19 and a mounting hole 18. The middle part of the connecting block 7 is fixedly connected to one end of the spring 6, and the end of the connecting block 7 is limited and rotatably connected to the non-threaded end of the corresponding screw 8. The connecting block 7 and the screw 8 are connected as one unit, facilitating the installation of the screw 8 and avoiding the problem of the screw 8 being easily lost during disassembly. The spring 6 is set in the mounting hole 18 and its other end abuts against the insert block 16. The screw 8 is screwed into the corresponding threaded hole 19. After installation, the spring 6 facilitates the fastening of the battery housing 1 and the insert block 16, and also facilitates the automatic ejection of the connecting block 7 during disassembly. By changing the connection method between the connecting block 7 and the battery housing 1, the disassembly and installation of the battery housing 1 and the battery cover 2 can be achieved.

[0025] The outer side of the connecting block 7 is covered with a sealing cover 15, which is fixedly connected to the corresponding mounting groove by an interference fit.

[0026] When using this invention, firstly, four stacked battery cells 3 are placed sequentially inside the insulating layer 4. Then, three separator plates 5 are installed between the four stacked battery cells 3. Next, the negative electrode connecting piece 13 and the negative electrode protection piece 14 are installed on the negative electrode of the battery cell 3, and the positive electrode connecting piece 9 and the positive electrode protection piece 10 are installed on the positive electrode of the battery cell 3. Then, the insert block 16 is installed in the slot 17, and finally, the screws 8 are installed to complete the fixing of the battery casing 1 and the battery cover 2.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A stacked four-cell lithium-ion battery, comprising a battery casing (1), a battery cover (2), stacked cells (3), an insulating layer (4), a positive electrode connector (9), a positive electrode protection plate (10), a positive terminal (11), a negative terminal (12), a negative electrode connector (13), and a negative electrode protection plate (14); the inner wall of the battery casing (1) is provided with an insulating layer (4), and four stacked cells (3) arranged side by side are placed in the insulating layer (4), and each stacked cell (3) has a positive electrode connector (9) and a negative electrode connector (13) fixed at its upper end, and the positive electrode connector (9) of the two stacked cells (3) located on the left side is connected to the corresponding positive electrode protection plate (10). The positive electrode connecting piece (9) of the two stacked cells (3) on the right side is connected to the corresponding positive electrode protection piece (10), the negative electrode connecting piece (13) of the two stacked cells (3) on the left side is connected to the corresponding negative electrode protection piece (14), and the negative electrode connecting piece (13) of the two stacked cells (3) on the right side is connected to the corresponding negative electrode protection piece (14); the upper end face of the battery casing (1) is connected to the battery cover (2), and the positive terminal (11) and the negative terminal (12) are fixed on the battery cover (2), the positive terminal (11) is connected to the positive electrode protection piece (10), and the negative terminal (12) is connected to the negative electrode protection piece (14); characterized in that: A separator plate (5) is inserted between each pair of adjacent stacked cells (3), and each separator plate (5) is provided with multiple through holes.

2. The stacked four-cell lithium-ion battery according to claim 1, characterized in that: The upper surface of the battery housing (1) is provided with a slot (17) around its circumference, and the lower surface of the battery cover (2) is provided with a plug (16) around its circumference. The plug (16) is inserted into the slot (17) in a matching manner. The plug (16) is provided with a connecting mechanism on both the left and right sides. The connecting mechanism is used to connect the plug (16) and the battery housing (1).

3. A stacked four-cell lithium-ion battery according to claim 2, characterized in that: A sealing ring is provided on the outer wall of the lower end of the insert (16).

4. A stacked four-cell lithium-ion battery according to claim 3, characterized in that: Each of the connecting mechanisms includes a spring (6), a connecting block (7), and a screw (8); the left and right side walls of the battery housing (1) are provided with mounting grooves, and each mounting groove and the corresponding position of the insert block (16) are provided with a threaded hole (19) and a mounting hole (18). The middle part of the connecting block (7) is fixedly connected to one end of the spring (6), and the end of the connecting block (7) is limited and rotatedly connected to the non-threaded end of the corresponding screw (8). The spring (6) is set in the mounting hole (18) and the other end abuts against the insert block (16). The screw (8) is screwed into the corresponding threaded hole (19).

5. A stacked four-cell lithium-ion battery according to claim 4, characterized in that: The outer side of the connecting block (7) is covered with a sealing cover (15), and the sealing cover (15) is fixedly connected to the corresponding mounting groove by interference fit.

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