A portable energy storage battery structure

Abstract

The present invention discloses a portable energy storage battery structure, comprising an upper bracket, a lower bracket, and a cell mechanism embedded in the upper bracket and the lower bracket. The cell mechanism comprises side cell groups located on both sides and a plurality of intermediate cell groups located in the middle. The side cell groups on both sides are respectively connected to the total positive electrode or the total negative electrode of the cell mechanism via a first nickel sheet. The first nickel sheet has a bent double-layer structure, and the plurality of intermediate cell groups of the cell mechanism are respectively connected to a second nickel sheet. By designing the first nickel sheet as a bent double-layer structure, the nickel sheet converges evenly, so that the current of the total positive electrode or the total negative electrode converges toward the bend of the first nickel sheet. This bent double-layer process ensures that the cell will not be overloaded, and the temperature of the cell and the nickel sheet does not exceed the maximum temperature of the cell, thereby ensuring the reliability of the entire battery system.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a portable energy storage battery structure. Background Art

[0002] Due to market demand and the development of society, the demand for portable energy storage power supplies has gradually emerged. Outdoor power supply issues, equipment power backup issues, power outages, and the inability to operate in remote areas such as outdoor areas due to power outages all affect our lives.

[0003] The nickel sheet design of current portable energy storage battery packs is a conventional design, which is directly connected to the total positive and negative electrodes. The convergence is uneven, resulting in excessive current in the total positive and negative electrodes of the battery pack, making the battery pack prone to overload. The temperature of the battery cell and the nickel sheet exceeds the maximum temperature of the battery cell, which can easily affect the battery cell performance and cycle life. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a portable energy storage battery structure to prevent battery cell overload and extend the life of the battery cell.

[0005] In view of this purpose, the present invention provides a portable energy storage battery structure, comprising an upper bracket, a lower bracket, and a battery cell mechanism embedded in the upper bracket and the lower bracket, wherein the battery cell mechanism comprises side battery cell groups located on both sides and a plurality of middle battery cell groups located in the middle;

[0006] The side cell groups on both sides are respectively connected to the total positive electrode or the total negative electrode of the cell structure through the first nickel sheet. The first nickel sheet is a bent double-layer structure. Several of the middle cell groups of the cell structure are respectively connected to the second nickel sheet.

[0007] Furthermore, the first nickel sheet includes an integrally formed first connecting sheet and a second connecting sheet, the first connecting sheet is connected to several battery cells on the side, and the second connecting sheet is connected to the total positive electrode or the total negative electrode; a notch structure is formed at the connection between the first connecting sheet and the second connecting sheet, and the first nickel sheet is bent along the extension line of the notch structure.

[0008] Furthermore, a PC insulating sheet is provided between the first connecting sheet and the second connecting sheet, and the PC insulating sheet is adhered and fixed to the first connecting sheet. When the first nickel sheet is in a bent state, the inner side surface of the second connecting sheet and the side of the PC insulating sheet away from the first connecting sheet are adhered and fixed.

[0009] Furthermore, a notch structure at the connection between the first connecting piece and the second connecting piece is V-shaped.

[0010] Furthermore, an NTC line clip for fixing the NTC line is provided between each of the intermediate battery cell groups.

[0011] Furthermore, each of the NTC wires is used to detect one of the battery cell groups.

[0012] Furthermore, the upper bracket is fixedly connected to the upper PC insulating sheet, and the lower bracket is fixedly connected to the lower PC insulating sheet.

[0013] Furthermore, the lower bracket and the lower PC insulating sheet are fixedly connected by a knurled barrel nut.

[0014] Furthermore, a BMS protection plate is fixedly connected to one side of the long side of the battery cell structure.

[0015] Furthermore, an exhaust fan is provided on one side of the short side of the battery cell structure.

[0016] Beneficial effects of the present invention: An embodiment of the present invention provides a portable energy storage battery structure, comprising an upper bracket, a lower bracket, and a cell mechanism embedded in the upper bracket and the lower bracket, wherein the cell mechanism comprises side cell groups located on both sides and a plurality of intermediate cell groups located in the middle; the side cell groups on both sides are respectively connected to the total positive electrode or the total negative electrode of the cell mechanism through a first nickel sheet, the first nickel sheet is a bent double-layer structure, and the plurality of intermediate cell groups of the cell mechanism are respectively connected to a second nickel sheet. By designing the structure of the first nickel sheet as a bent double-layer structure, the nickel sheet converges evenly, so that the current of the total positive electrode or the total negative electrode converges to the bend of the first nickel sheet. The bent double-layer process ensures that the cell will not be overloaded, and the temperature of the cell and the nickel sheet does not exceed the maximum temperature of the cell, thereby ensuring the reliability of the entire battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 An explosion of a portable energy storage battery structure provided by an embodiment of the present invention Figure 1 ;

[0019] Figure 2 An explosion of a portable energy storage battery structure provided by an embodiment of the present invention Figure 2 ;

[0020] Figure 3 A schematic structural diagram of a cell structure of a portable energy storage battery structure provided by an embodiment of the present invention;

[0021] Figure 4 A schematic structural diagram of a first nickel sheet of a portable energy storage battery structure provided by an embodiment of the present invention.

[0022] In the figure: 1. Upper bracket; 2. Lower bracket; 3. Battery cell mechanism; 30. Side battery cell group; 31. Middle battery cell group; 4. First nickel sheet; 40. First connecting sheet; 41. Second connecting sheet; 42. Notch structure; 5. Second nickel sheet; 6. PC insulating sheet; 7. NTC line card; 70. NTC line; 8. Upper PC insulating sheet; 9. Lower PC insulating sheet; 10. Knurled barrel nut; 11. BMS protection board; 12. Exhaust fan. DETAILED DESCRIPTION

[0023] The embodiment of the present invention provides a portable energy storage battery structure, which prevents battery cell overload and prolongs the battery cell life.

[0024] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0026] Example:

[0027] In view of the problems existing in the prior art, the present invention designs a portable energy storage battery structure to prevent battery cell overload and extend the battery cell life.

[0028] Figure 1 This is an exploded diagram of a portable energy storage battery structure. Figure 1-Figure 4 As shown, a portable energy storage battery structure includes an upper bracket 1, a lower bracket 2, and a battery cell mechanism 3 embedded in the upper bracket 1 and the lower bracket 2. The battery cell mechanism 3 includes side battery cell groups 30 located on both sides thereof and a plurality of intermediate battery cell groups 31 located in the middle;

[0029] The side cell groups 30 on both sides are respectively connected to the total positive electrode or the total negative electrode of the cell structure 3 through the first nickel sheet 4. The first nickel sheet 4 is a bent double-layer structure. Several of the intermediate cell groups 31 of the cell structure 3 are respectively connected to the second nickel sheet 5.

[0030] In this specific embodiment, the battery structure adopts an upper bracket 1, a lower bracket 2, a battery cell mechanism 3 and a nickel sheet combination, and is fastened by locking screws, with high assembly efficiency and fool-proof assembly. The side battery cell group 30 in the battery cell mechanism 3 includes 5 cylindrical batteries, and the middle battery cell group 31 includes 10 cylindrical batteries. The number of cylindrical batteries in other embodiments is not limited. A side cell group 30 is provided on each side, and one side of the two side cell groups 30 is connected to the total positive pole of the entire cell mechanism 3 through the first nickel sheet 4, and the other side cell group 30 is connected to the total negative pole of the entire cell mechanism 3. The middle cell groups 31 are connected in series through the second nickel sheet 5, and are connected in series with the side cell groups 30 on both sides. By designing the structure of the first nickel sheet 4 as a bent double-layer structure, the nickel sheets converge evenly, so that the current of the total positive pole or the total negative pole converges to the bending part of the first nickel sheet 4. The bent double-layer process ensures that the battery cell will not be overloaded, the temperature of the battery cell and the nickel sheet does not exceed the maximum temperature of the battery cell, and the rate charge and discharge current of the battery cell does not exceed 720W. Using the laser spot welding process, the first nickel sheet 4 is designed with an 80A large current discharge function and a single cylindrical battery cell short-circuit fuse protection function to ensure the reliability of the entire battery system.

[0031] Furthermore, the first nickel sheet 4 includes an integrally formed first connecting sheet 40 and a second connecting sheet 41, the first connecting sheet 40 is connected to the side battery cell group 30, and the second connecting sheet 41 is connected to the total positive electrode or the total negative electrode; a notch structure 42 is formed at the connection between the first connecting sheet 40 and the second connecting sheet 41, and the first nickel sheet 4 is bent along the extension line of the notch structure 42.

[0032] Specifically, the first nickel sheet 4 includes an integrally formed first connecting sheet 40 and a second connecting sheet 41. The first connecting sheet 40 is connected to the positive or negative electrode of the side battery cell group 30. A notch structure 42 is formed at the connection between the first connecting sheet 40 and the second connecting sheet 41. The total positive or negative current converges to the notch structure 42, so that the current convergence of the first nickel sheet 4 is uniform, and the first connecting sheet 40 and the second connecting sheet 41 can be folded along the notch structure 42 to form a two-layer structure.

[0033] In this embodiment, the currents of the five groups of battery cells are converged to the first connecting plate 40 under the first nickel plate 4, and then converged to the total positive electrode or the total negative electrode through the second connecting plate 41, to prevent all the currents from first passing through the first side battery cell group 30, causing the side battery cell group 30 to overload and heat up, affecting the performance of the entire battery cell mechanism 3.

[0034] Furthermore, a PC insulating sheet 6 is provided between the first connecting sheet 40 and the second connecting sheet 41, and the PC insulating sheet 6 is glued and fixed to the first connecting sheet 40. When the first nickel sheet 4 is in a bent state, the inner side surface of the second connecting sheet 41 and the side of the PC insulating sheet 6 away from the first connecting sheet 40 are adhered and fixed.

[0035] Specifically, after the first nickel sheet 4 is bent, the first connecting sheet 40 and the second connecting sheet 41 are isolated by bonding the PC insulating sheet 6 with double-sided tape, so that the current can flow into the notch structure 42 and then into the total positive electrode or the total negative electrode, preventing the first connecting sheet 40 and the second connecting sheet 41 from overlapping and failing to converge.

[0036] Furthermore, the notch structure 42 at the connection between the first connecting piece 40 and the second connecting piece 41 is V-shaped.

[0037] Specifically, the notch structure 42 at the connection between the first connecting piece 40 and the second connecting piece 41 is in a small V-shape, which facilitates better flow convergence.

[0038] Furthermore, an NTC line clamp 7 for fixing the NTC line 70 is provided between each of the intermediate battery cell groups 31 .

[0039] Specifically, the temperature of different positions of the battery cell mechanism 3 is detected by NTC, which has the function of high-temperature and low-temperature protection during charging and discharging.

[0040] Furthermore, each of the NTC wires 70 is used to detect one of the battery cell groups.

[0041] Specifically, the NTC line card 7 is used to secure the NTC line. The design of the NTC line card 7 can reduce the amount of high-temperature adhesive used, lowering costs while also improving aesthetics. Current power battery packs are typically equipped with only two NTCs, which collect the surface temperature of the cells and cannot accurately detect abnormal cell temperatures throughout the entire cell mechanism 3. Consequently, temperature protection cannot function quickly, resulting in a low safety factor for the battery pack. In this embodiment, the cell mechanism 3 is designed with four NTCs: NTC1 detects cells B1 and B3, NTC2 detects cells B2 and B4, NTC3 detects cells B4 and B6, and NTC4 detects cells B5 and B7. Each cell string can detect its temperature. When any cell experiences an abnormal temperature rise, the NTC accurately detects the cell temperature and activates temperature protection when the temperature exceeds the cell's operating temperature, significantly improving the safety factor of the battery pack.

[0042] Furthermore, the upper bracket 1 is fixedly connected to the upper PC insulating sheet 8 , and the lower bracket 2 is fixedly connected to the lower PC insulating sheet 9 .

[0043] Specifically, an upper PC insulating sheet 8 and a lower PC insulating sheet 9 are respectively provided on the outer sides of the upper bracket 1 and the lower bracket 2 to play a protective role.

[0044] Furthermore, the lower bracket 2 is fixedly connected to the housing via a knurled barrel nut 10 .

[0045] In addition, the housing is connected via a knurled barrel nut 10, which is not shown in the figure.

[0046] Furthermore, a BMS protection board 11 is fixedly connected to one side of the long side of the battery cell structure 3 .

[0047] Specifically, by arranging the BMS protection board 11 on one side of the long side of the battery cell mechanism 3 , the electrical safety of the battery cell mechanism 3 can be better protected.

[0048] Furthermore, exhaust fans 12 are provided on both sides of the short sides of the battery cell structure 3 .

[0049] Specifically, forced convection heat dissipation is performed by exhaust fan 12

[0050] In summary, an embodiment of the present invention provides a portable energy storage battery structure, comprising an upper bracket, a lower bracket, and a cell mechanism embedded in the upper bracket and the lower bracket, wherein the cell mechanism comprises side cell groups located on both sides and a plurality of intermediate cell groups located in the middle; the side cell groups on both sides are respectively connected to the total positive electrode or the total negative electrode of the cell mechanism through a first nickel sheet, the first nickel sheet is a bent double-layer structure, and the plurality of intermediate cell groups of the cell mechanism are respectively connected to a second nickel sheet. By designing the structure of the first nickel sheet as a bent double-layer structure, the nickel sheet converges evenly, so that the current of the total positive electrode or the total negative electrode converges to the bend of the first nickel sheet. The bent double-layer process ensures that the cell will not be overloaded, and the temperature of the cell and the nickel sheet does not exceed the maximum temperature of the cell, thereby ensuring the reliability of the entire battery system.

[0051] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A portable energy storage battery structure, characterized in that: It comprises an upper bracket (1), a lower bracket (2), and a cell mechanism (3) embedded in the upper bracket (1) and the lower bracket (2), wherein the cell mechanism (3) comprises side cell groups (30) located on both sides and a plurality of middle cell groups (31) located in the middle; The side battery cell groups (30) on both sides are respectively connected to the total positive electrode or the total negative electrode of the battery cell mechanism (3) through a first nickel sheet (4), the first nickel sheet (4) is a bent double-layer structure, and the plurality of intermediate battery cell groups (31) of the battery cell mechanism (3) are respectively connected to a second nickel sheet (5); The first nickel sheet (4) comprises an integrally formed first connecting sheet (40) and a second connecting sheet (41), the first connecting sheet (40) being connected to a plurality of battery cells on the side, and the second connecting sheet (41) being connected to the total positive electrode or the total negative electrode; a notch structure (42) is formed at the connection between the first connecting sheet (40) and the second connecting sheet (41), and the first nickel sheet (4) is bent along an extension line of the notch structure (42); A PC insulating sheet (6) is provided between the first connecting sheet (40) and the second connecting sheet (41), and the PC insulating sheet (6) is adhered and fixed to the first connecting sheet (40); when the first nickel sheet (4) is in a bent state, the inner side surface of the second connecting sheet (41) and the side of the PC insulating sheet (6) away from the first connecting sheet (40) are adhered and fixed; An NTC line clamp (7) for fixing the NTC line (70) is provided between each of the intermediate battery cell groups (31).

2. The portable energy storage battery structure according to claim 1, characterized in that: The notch structure (42) at the connection between the first connecting piece (40) and the second connecting piece (41) is V-shaped.

3. The portable energy storage battery structure according to claim 1, characterized in that: Each of the NTC wires (70) is used to detect a battery cell group.

4. The portable energy storage battery structure according to claim 1, characterized in that: The upper bracket (1) is fixedly connected to the upper PC insulating sheet (8), and the lower bracket (2) is fixedly connected to the lower PC insulating sheet (9).

5. The portable energy storage battery structure according to claim 4, characterized in that: The lower bracket (2) and the lower PC insulating sheet (9) are fixedly connected via a knurled barrel nut (10).

6. The portable energy storage battery structure according to claim 1, characterized in that: A BMS protection plate (11) is fixedly connected to one side of the long side of the battery cell structure (3).

7. The portable energy storage battery structure according to claim 1, characterized in that: An exhaust fan (12) is provided on one side of the short side of the battery cell mechanism (3).

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