Lithium ion battery with enhanced electrolyte space distribution
By setting a hole-mounted grid on the side of the insulating sheet of the lithium-ion battery and the outer side of the separator, a space for storing the electrolyte is formed, the problem of uneven distribution of the electrolyte is solved, and the uniform distribution of the electrolyte is achieved, and the cycle life and safety performance of the battery are improved.
Patent Information
- Application Number
- CN202420616559.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-03-28
AI Technical Summary
During the charging and discharging cycle of lithium-ion batteries, due to the uneven distribution of electrolytes, some places have insufficient electrolytes, resulting in black spots or insufficient lithium embeddedness, and too much electrolytes in the other places have led to lithium extraction, which seriously affects the battery's life and safety performance.
A hole-laid grid is provided on the side of the insulating sheet of the lithium-ion battery and the outer side of the separator to form a space for storing the electrolyte, and the exchange of electrolyte during the charge and discharge cycle is ensured through the reserved holes.
The liquid storage space formed by the physical separator avoids local aggregation of the electrolyte, making the electrolyte more uniform distribution, preventing battery damage caused by locally less or more liquids, and improving the battery's cycle life and safety performance.
Smart Images
Figure CN222619814U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium ion batteries, in particular to a lithium ion battery with enhanced electrolyte spatial distribution. Background Art
[0002] Compared with lithium batteries, lithium-ion batteries are rechargeable and are currently widely used in various industries such as power and energy storage.
[0003] Typically, a lithium-ion battery includes a core, an insulating sheet, a spacer, an electrolyte, and a shell. The insulating sheet protects the core and packages the core, the insulating sheet, and the electrolyte together through the shell. The spacer separates the cover plate from the core.
[0004] The current distribution of electrolyte inside the battery is such that, due to the effect of gravity, the electrolyte is at the bottom when in use, while there is very little or even no electrolyte at the top and both ends. This can easily cause insufficient lithium insertion in the liquid-poor position during the charge and discharge cycle, leading to black spots, and excessive lithium ion insertion in the liquid-rich position, leading to lithium precipitation, which seriously affects the life and safety performance of the lithium-ion battery. Utility Model Content
[0005] The purpose of the utility model is to provide a lithium ion battery with enhanced electrolyte spatial distribution to solve the problems encountered in the above-mentioned background technology.
[0006] To achieve the above purpose, the technical solution of the utility model is as follows:
[0007] A lithium-ion battery with enhanced electrolyte spatial distribution comprises an insulating sheet, a pole core, a battery shell, a spacer and a cover plate, wherein the insulating sheet is wrapped around the outer side of the pole core, the spacer is installed at the end of the pole core, and the side edge of the insulating sheet and the outer side surface of the spacer are respectively provided with a plurality of grids for accommodating electrolyte, each grid having a hole.
[0008] In the above solution, a plurality of first grids for accommodating electrolyte are arranged on the side of the insulating sheet, each of the first grids is provided with a first hole, and the outer side of the insulating sheet is sealed by the battery shell. The height of the first grid is 1-2 mm, and preferably a grid with a thickness of 2 mm is adopted. The hole shape of the first hole is any one of a circular, polygonal, and elliptical structure.
[0009] Specifically, the insulating sheet includes a first side, a second side, and a large surface of the insulating sheet. The large surface of the insulating sheet is provided with two pieces. The inner side of the first side is connected to the second side through one of the large surfaces of the insulating sheet, and the other side of the second side is connected to the end of the first side through another large surface of the insulating sheet, thereby forming a rectangular cylindrical structure; wherein the first grid is distributed on the first side and the second side.
[0010] As a preferred solution, a third side edge is provided at the end of the large surface of the insulating sheet, and after the first side edge is bent, the insulating sheet forms a rectangular cylindrical structure together with the third side edge.
[0011] Specifically, the outer side of the spacer is respectively provided with a plurality of second grids for accommodating electrolyte, each of which is provided with a second hole, and the outer side of the spacer is sealed by a cover plate. The height of the second grid is 1-2 mm, and preferably a grid with a thickness of 2 mm is used. The hole shape of the second hole is any one of a circular, polygonal, and elliptical structure.
[0012] As a preferred solution, the second grid is arranged on the outer peripheral surface of the spacer, and a hole groove is opened in the middle of the spacer. The hole groove is any one of a circular, polygonal and elliptical structure.
[0013] In addition, in one of the embodiments, two adjacent pieces of the second grid are not provided with partition plates on both sides of the outer side of the spacer, thereby forming a groove.
[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: the solution forms a space for storing electrolyte by adding a perforated grid on the side of the insulating sheet and sealing it with the side of the battery shell, and forms a space for storing electrolyte by adding a perforated grid and a perforated groove on the outer surface of the spacer and sealing it with the cover plate. The reserved holes ensure the exchange of electrolyte during the charge and discharge cycle. The liquid storage space formed by the physical barrier effectively avoids the local accumulation of electrolyte inside the battery shell, making the distribution of electrolyte in the battery shell space more uniform, preventing black spots and insufficient lithium insertion caused by local low liquid during the charge and discharge cycle of the battery, and preventing edge lithium precipitation caused by local high liquid core immersed in electrolyte, thereby improving the cycle life and safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them:
[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0017] Figure 2 It is a schematic diagram of the unfolded structure of the insulating sheet in the utility model;
[0018] Figure 3 This is a schematic diagram of the structure of the middle spacer ring of the utility model;
[0019] Figure 4It is a schematic diagram of the assembly structure of the middle spacer ring and the cover plate of the utility model.
[0020] Numbers in the figure: 1-insulating sheet; 11-first side; 12-second side; 13-third side; 14-large surface of insulating sheet; 15-first grid; 16-first hole; 2-pole core; 21-pole ear; 3-battery shell; 31-large surface of shell; 32-side of shell; 4-spacer; 41-second grid; 42-second hole; 43-groove; 44-hole slot; 5-cover plate. DETAILED DESCRIPTION
[0021] In order to make the technical means, creative features, objectives and effects of the utility model easier to understand, the utility model is now further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the relevant components of the utility model.
[0022] According to the technical solution of the utility model, without changing the essential spirit of the utility model, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the utility model, and should not be regarded as the entirety of the utility model or as a limitation or restriction to the technical solution of the utility model.
[0023] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.
[0024] Embodiment 1, as Figure 1 As shown, a lithium-ion battery with enhanced electrolyte spatial distribution includes an insulating sheet 1, a pole core 2, a battery shell 3, a spacer 4 and a cover plate 5, which are the main components of current lithium-ion batteries. The insulating sheet 1 is wrapped around the outer side of the pole core 2, and the outer side of the insulating sheet 1 is also tightly wrapped around the battery shell 3. The spacer 4 is installed at the end of the pole core 2, and its outer side is also closely attached to the cover plate 5.
[0025] The side edges of the insulating sheet 1 and the outer side surfaces of the spacer ring 4 are respectively provided with a plurality of grids for containing electrolyte, and each grid is provided with holes to facilitate the exchange of electrolyte during the charge and discharge cycle of the battery.
[0026] During implementation, the insulating sheet 1 of the lithium-ion battery is provided with a grid with holes on its side, which is sealed with the battery shell 3 to form an electrolyte storage space on the side of the battery cell. The spacer 4 of the lithium-ion battery is fixed to the insulating sheet 1 by hot melting on the outer side of the spacer 4, and the spacer 4 is provided with a grid with holes on the side, which is sealed with the top of the positive and negative electrode cover plates 5 to form an electrolyte storage space on both sides of the positive and negative electrodes of the battery cell.
[0027] By providing a grid and providing holes in each grid for convenient exchange of electrolyte during the charge and discharge cycle, the technical problem of little or even no electrolyte at the top and both ends of the electrolyte when it is in use is solved.
[0028] Embodiment 2, as Figure 2 As shown, based on Example 1, specifically, a plurality of first grids 15 for accommodating electrolyte are provided on the side of the insulating sheet 1, and a first hole 16 is provided in each first grid 15. The outer side of the insulating sheet 1 is sealed by wrapping the battery shell 3, and the electrolyte is sealed inside the battery. The height of the first grid 15 is 1-2 mm, and the hole shape of the first hole 16 is any one of a circular, polygonal, and elliptical structure, as long as the electrolyte can be exchanged with the pole core 2.
[0029] In further description, the insulating sheet 1 includes a first side 11, a second side 12, and an insulating sheet large surface 14. The insulating sheet large surface 14 has two pieces. The inner side of the first side 11 is integrally connected to the second side 12 through one of the insulating sheet large surfaces 14, and the other side of the second side 12 is integrally connected to the end of the first side 11 through another insulating sheet large surface 14, thereby forming a rectangular cylindrical structure. Please refer to Figure 1 .
[0030] The first grid 15 is distributed on the first side 11 and the second side 12. When the battery is installed and working, the first side 11 is located at the upper position of the lithium-ion battery, and the second side 12 is located at the lower position of the lithium-ion battery. The side of the battery housing 3 is in close contact with the insulating sheet 1 to form a relatively closed space, which is convenient for the storage of electrolyte on both sides of the battery.
[0031] Embodiment 3, based on embodiment 2, a third side 13 is provided at the end of the large surface 14 of the insulating sheet, and the first side 11 is bent to form a rectangular cylindrical structure with the third side 13. The insulating sheet 1 is tightly wrapped around the pole core 2, and the first side 11 and the third side 13 are overlapped at the end, and the first hole 16 is located at the same position after bending.
[0032] Example 4, based on Example 1, please refer to Figure 3 The outer side of the spacer 4 is respectively provided with a plurality of second grids 41 for accommodating electrolyte, each second grid 41 is provided with a second hole 42, and the outer side of the spacer 4 is sealed by a cover plate 5. The height of the second grid 41 is 1-2 mm, and the hole shape of the second hole 42 is any one of a circular, polygonal, and elliptical structure, as long as the electrolyte can be exchanged with the pole core 2.
[0033] Embodiment 5, based on embodiment 4, the second grid 41 is arranged on the outer peripheral surface of the spacer 4, and a hole groove 44 is opened in the middle of the spacer 4, and the hole groove 44 is any one of a circular, polygonal, and elliptical structure. The hole groove 44 is used to provide a space for the pole ear 21 located at the side end of the pole core 2 to avoid when the battery is assembled.
[0034] Further, as a preferred solution, in implementation, two adjacent pieces of the second grid 41 are not provided with partitions on both sides of the outer side of the spacer 4, thereby forming a groove 43. It comprises a plurality of rectangular grooves 43 with holes, and its height is the same as the height of the grid. All holes, whether on the groove 43 or on the second grid 41, facilitate the exchange of electrolyte during the charge and discharge cycle of the battery.
[0035] See also Figure 4 The spacer 4 of the lithium-ion battery is fixed to the sides of the insulating sheet 1 by hot melting during battery assembly. The cover plate 5 of the battery is in close contact with the spacer 4 to form a relatively sealed space, which is convenient for storing electrolyte at both ends of the positive and negative electrodes, and the electrolyte is exchanged through the holes during the battery charge and discharge cycle.
[0036] In summary, this solution forms a space for storing electrolyte by adding a perforated grid on the side of the insulating sheet 1 and sealing it with the side of the battery housing 3, and forms a space for storing electrolyte by adding a perforated grid and a perforated groove 43 on the outer surface of the spacer 4 and sealing it with the cover plate 5. The reserved holes ensure the exchange of electrolyte during the charge and discharge cycle. The liquid storage space formed by the physical barrier effectively avoids the local accumulation of electrolyte inside the battery housing, making the distribution of electrolyte in the battery housing space more uniform, preventing black spots and insufficient lithium insertion caused by local low liquid during the charge and discharge cycle of the battery, and preventing edge lithium precipitation caused by local high liquid core immersed in electrolyte, thereby improving the cycle life and safety performance of the battery.
[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. These undisclosed elements are all prior art that can be known to those skilled in the art.
[0038] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.
Claims
1. A lithium-ion battery with enhanced electrolyte spatial distribution, comprising an insulating sheet (1), a pole core (2), a battery housing (3), a spacer (4) and a cover plate (5), wherein the insulating sheet (1) is wrapped around the outer side of the pole core (2), and the spacer (4) is installed at the end of the pole core (2), characterized in that: A plurality of grids for containing electrolyte are respectively arranged on the side of the insulating sheet (1) and the outer side of the spacer (4), and each grid is provided with a hole.
2. A lithium-ion battery with enhanced electrolyte spatial distribution according to claim 1, characterized in that: A plurality of first grids (15) for containing electrolyte are arranged on the side of the insulating sheet (1), each of the first grids (15) is provided with a first hole (16), and the outer side of the insulating sheet (1) is sealed by the battery housing (3).
3. A lithium-ion battery with enhanced electrolyte spatial distribution according to claim 2, characterized in that: The insulating sheet (1) comprises a first side (11), a second side (12), and a large insulating sheet surface (14); the large insulating sheet surface (14) is provided with two sheets; the inner side of the first side (11) is connected to the second side (12) via one of the large insulating sheet surfaces (14); the other side of the second side (12) is connected to the end of the first side (11) via the other large insulating sheet surface (14), thereby forming a rectangular cylindrical structure; wherein the first grid (15) is distributed on the first side (11) and the second side (12).
4. A lithium-ion battery with enhanced electrolyte spatial distribution according to claim 3, characterized in that: A third side edge (13) is provided at the end of the large surface (14) of the insulating sheet, and after the first side edge (11) is bent, the insulating sheet (1) forms a rectangular cylindrical structure with the third side edge (13).
5. A lithium-ion battery with enhanced electrolyte spatial distribution according to claim 2, characterized in that: The height of the first grid (15) is 1-2 mm, and the hole shape of the first hole (16) is any one of a circular, polygonal, and elliptical structure.
6. The lithium-ion battery with enhanced electrolyte spatial distribution according to claim 1, characterized in that: The outer side surfaces of the spacer (4) are respectively provided with a plurality of second grids (41) for containing electrolyte, each of the second grids (41) is provided with a second hole (42), and the outer side of the spacer (4) is sealed by a cover plate (5).
7. A lithium-ion battery with enhanced electrolyte spatial distribution according to claim 6, characterized in that: The second grid (41) is arranged on the outer peripheral surface of the spacer (4), and a hole groove (44) is opened in the middle of the spacer (4).
8. A lithium-ion battery with enhanced electrolyte spatial distribution according to claim 7, characterized in that: Two adjacent pieces of the second grid (41) are not provided with partition plates on both sides of the outer side of the spacer (4), thereby forming a groove (43).
9. The lithium-ion battery with enhanced electrolyte spatial distribution according to claim 6, characterized in that: The height of the second grid (41) is 1-2 mm, and the hole shape of the second hole (42) is any one of a circular, polygonal, and elliptical structure.
10. The lithium-ion battery with enhanced electrolyte spatial distribution according to claim 7, characterized in that: The hole groove (44) is any one of a circular, polygonal and elliptical structure.