Fixing device of CTP soft package battery cell

Abstract

The utility model discloses a fixing device of a CTP (computer to plate) soft package battery cell, and belongs to the technical field of accessory devices of power batteries on electric automobiles. The device comprises two end clamping plates which are arranged in parallel, the plurality of battery cells are uniformly distributed between the two end part clamping plates; the battery cell tab is fixedly connected to the end part of the battery cell; the battery cell tab is fixedly connected with a tab fixing block, and a pressing block is arranged above the battery cell corresponding to the battery cell tab; the first bolt penetrates through countersunk through holes in the pressing block and the tab fixing block and is in threaded connection with a threaded hole formed in the bottom of the box body, a connecting convex block is arranged on the tab fixing block, and the tab fixing block is clamped with a hole of the fixing bracket through the connecting convex block; a battery cell tab at a pole outlet position sequentially penetrates through the pressing block, the pole outlet fixing block and the pole outlet connecting bracket through a second bolt and is fixedly connected with the end part clamping plate; and two ends of the pressing plate are respectively and fixedly connected with the end part clamping plates, and the utility model has the beneficial effects of simple structure, convenience in installation and strong applicability.

Description

Technical Field

[0001] The utility model relates to the technical field of accessory devices for power batteries on electric vehicles, in particular to a fixing device for CTP soft-pack battery cells. Background Art

[0002] At present, most of the assembly processes of CTP power battery systems are to directly place the battery cells in the battery box body by gluing or welding.

[0003] In the prior art, generally, limit grooves, positioning pins, etc. are designed at the bottom of the battery box body for fixing the two ends of the battery cells. Then, a heat-conducting structural adhesive is used to paste the soft-pack battery cells on the surface of the liquid-cooling plate, and then the battery cell tabs are connected in series and parallel by superposing and welding. It can be seen that the existing method of fixing soft-pack battery cells will, on the one hand, increase the design and manufacturing costs of the liquid-cooling plate and the battery box body. On the other hand, the connection schemes of gluing and welding will make it impossible to replace a single battery cell later. If a certain battery cell in the battery pack fails during after-sales problems, only the entire battery pack can be replaced, and even finally, it is violently disassembled and scrapped. This method undoubtedly greatly increases the after-sales maintenance cost and also causes a large amount of energy waste. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the defects existing in the prior art and provide a fixing device for CTP soft-pack battery cells with a simple structure and convenient installation and maintenance.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A fixing device for CTP soft-pack battery cells disclosed by the utility model includes:

[0007] Two end clamping plates arranged in parallel with each other;

[0008] A plurality of battery cells evenly distributed between the two end clamping plates; and

[0009] A pressing block and a battery cell tab fixedly connected to the end of the battery cell;

[0010] The battery cell tab is fixedly connected with a tab fixing block, and the pressing block is arranged above the battery cell corresponding to the battery cell tab; it further includes

[0011] A first bolt, which passes through the counterbore through holes in the pressing block and the tab fixing block and is threadedly connected with a threaded hole opened at the bottom of the box body. A connecting convex block is arranged on the tab fixing block, and the tab fixing block and the hole of the fixing bracket are clamped through the connecting convex block;

[0012] Among them, the cell tab at the pole output position is fixedly connected to the end clamping plate through the second bolt successively penetrating through the pressing block, the pole output fixing block, and the pole output connecting bracket; it further includes

[0013] A pressing plate, the two ends of which are respectively fixedly connected to the end clamping plate.

[0014] Furthermore, a tab fixing hole is arranged on one side of the counterbore through hole at the top of the tab fixing block, and the tab fixing hole is fixedly connected to the cell tab and the pressing block. The bottom of the tab fixing block is screwed to the battery box body through the counterbore through hole. A connecting convex block is arranged on the side of the tab fixing block, and is clamped with a hole on the fixing bracket through interference fit of the connecting convex block.

[0015] Furthermore, a tab fixing hole and a through hole are opened at the top of the pole output fixing block. The cell tab is fixedly connected through the tab fixing hole, and the second bolt is installed through the through hole.

[0016] Furthermore, a first flanging and a second flanging are successively arranged at the bottom and the middle of the same side of the end clamping plate. A box body connecting hole is opened on the first flanging, and a pressing plate connecting hole and a clearance hole are opened on the second flanging.

[0017] Furthermore, a plurality of weight reduction holes are opened on the surface of the end clamping plate.

[0018] Furthermore, a flame-retardant foam with a thickness of 0.5 - 1 mm is arranged between adjacent two cells.

[0019] Furthermore, the flame-retardant foam is 0.8 mm.

[0020] Furthermore, a flame-retardant foam is arranged between the end clamping plate and the cell, and a buffer foam is arranged between the pressing plate and the top of the cell.

[0021] In the above technical solution, a fixing device for a CTP soft-pack cell provided by the present utility model has the following beneficial effects:

[0022] The fixing device for the CTP soft-pack cell designed by the present utility model fixes the soft-pack cell body and the cell tab inside the battery box body by screwing. It can not only directly fix the soft-pack cell in the battery box, but also has a simple structure, is convenient to install, has strong applicability, can meet the process requirements of multi-layer cells being fixed and disassembled separately, has strong interchangeability of cells, is convenient for after-sales maintenance, can replace a single abnormal cell, and is beneficial to reducing the maintenance cost of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0024] Figure 1 is the front view of the overall structure of the fixing device for the CTP soft-pack battery cell disclosed in the present utility model;

[0025] Figure 2 is the right view of the overall structure of the fixing device for the CTP soft-pack battery cell disclosed in the present utility model;

[0026] Figure 3 is the front view of the tab fixing block of the fixing device for the CTP soft-pack battery cell disclosed in the present utility model;

[0027] Figure 4 is Figure 3 the top view of;

[0028] Figure 5 is the front view of the output pole fixing block of the fixing device for the CTP soft-pack battery cell disclosed in the present utility model;

[0029] Figure 6 is Figure 5 the top view of;

[0030] Figure 7 is the front view of the end clamping plate of the fixing device for the CTP soft-pack battery cell disclosed in the present utility model;

[0031] Figure 8 is Figure 7 the top view of;

[0032] Explanation of reference numerals:

[0033] 1. End clamping plate; 2. Tab fixing block; 3. Battery cell; 4. Compression block; 5. Tab; 6. Pressure plate; 7. Fixed bracket; 8. Output pole fixing block; 9. Output pole connecting bracket; 10. Tab fixing hole; 11. Countersunk through hole; 12. Connecting convex block; 13. Through hole; 14. Bolt mounting surface; 15. Weight reduction hole; 16. Box body connecting hole; 17. Clearance hole; 18. Pressure plate connecting hole. Detailed implementation manners

[0034] To enable those skilled in the art to better understand the technical solutions of the present utility model, the following will further introduce the present utility model in detail in conjunction with the drawings.

[0035] See Figure 1 , 2 as shown;

[0036] A fixing device for CTP soft-pack battery cells, comprising:

[0037] Two end clamping plates 1 arranged in parallel with each other;

[0038] A number of battery cells 3 evenly distributed between the two end clamping plates 1; and

[0039] A pressing block 4 and a battery cell tab 5 fixedly connected to the end of the battery cell 3;

[0040] The battery cell tab 5 is fixedly connected with a tab fixing block 2, and a pressing block 4 is arranged above the battery cell tab 5 corresponding to the battery cell 3; it further includes

[0041] A first bolt, which passes through the counterbore 11 in the pressing block 4 and the tab fixing block 2 and is threadedly connected with the threaded hole opened at the bottom of the box body. A connecting convex block 12 is provided on the tab fixing block 2, and the tab fixing block 2 and the hole of the fixing bracket 7 are clamped through the connecting convex block 12;

[0042] Among them, the battery cell tab 5 at the tab outlet position is fixedly connected with the end clamping plate 1 through the second bolt passing through the pressing block 4, the tab outlet fixing block 8 and the tab outlet connecting bracket 9 in sequence; it further includes

[0043] A pressing plate 6, the two ends of which are respectively fixedly connected with the end clamping plates 1.

[0044] See Figure 3 、 4 shown:

[0045] Preferably, a tab fixing hole 10 is arranged on one side of the counterbore 11 at the top of the tab fixing block 2, and the tab 5 and the pressing block 4 are fixedly connected through the tab fixing hole 10. The bottom of the tab fixing block 2 is screwed to the battery box body through the counterbore 11. A connecting convex block 12 is arranged on the side of the tab fixing block 2, and the tab fixing block 2 and the hole on the fixing bracket 7 are clamped in an interference fit through the connecting convex block 12;

[0046] See Figure 5 、 6 shown:

[0047] Preferably, the top of the tab outlet fixing block 8 is provided with a tab fixing hole 10 and a through hole 13. The tab 5 is fixedly connected through the tab fixing hole 10, and the second bolt is installed through the through hole 13.

[0048] See Figure 7 、 8 shown:

[0049] Preferably, a first flanging and a second flanging are sequentially arranged at the bottom and middle on the same side of the end clamping plate 1. A box body connection hole 16 is provided on the first flanging, and a pressing plate connection hole 18 and a clearance hole 17 are provided on the second flanging. Specifically, the top of the end clamping plate 1 is screwed with the pressing plate 6 through the pressing plate connection hole 18, the bottom of the end clamping plate 1 is screwed with the battery box body through the box body connection hole 16, the side surface of the end clamping plate 1 is screwed with the pole output connection bracket 9 through a through hole, and the upper part of the pole output connection bracket 9 is screwed with the pole output fixing block 8.

[0050] Preferably, a plurality of weight reduction holes 15 are provided on the surface of the end clamping plate 1.

[0051] Preferably, a flame-retardant foam with a thickness of 0.5 - 1 mm, specifically 0.8 mm, is provided between two adjacent battery cells 3.

[0052] Preferably, a flame-retardant foam is provided between the end clamping plate 1 and the battery cell 3, and a buffer foam is provided between the pressing plate 6 and the top of the battery cell 3.

[0053] In a specific embodiment, two end clamping plates 1 vertically fixed to the bottom of the box body are parallel to each other. The battery cells 3 are neatly arranged between the two end clamping plates 1 (the distance between the two end clamping plates 1 needs to be calculated according to the thickness and number of the battery cells). After the battery cell tabs 5 are fixedly connected through separate tab fixing blocks 2, the pressing block 4 is used to press the battery cell tabs 5 to avoid loose connection. The bolts are screwed into the bottom of the box body through the counterbore through holes 11 in the pressing block 4 and the tab fixing block 2 to fix the tab fixing block 2 in the box body. Then, the tab fixing block 2 and the fixing bracket 7 are connected through the connecting convex block 12 on the tab fixing block 2. By analogy, multiple tab fixing blocks 2 are serially fixed through the fixing bracket 7. Finally, the battery cell tabs 5 at the pole output position are fixed on the end clamping plate 1 in sequence by screwing through the pressing block 4, the pole output fixing block 8, and the pole output connection bracket 9. Finally, the pressing plate 6 and the end clamping plate 1 are fixed to achieve the purpose of fixing the battery cells.

[0054] During installation, it is necessary to calculate the distance between the two end clamping plates 1 according to the number of battery cells 3 required for the series and parallel connection of the soft-pack battery cell tabs 5 (it is well known to those skilled in the art: calculated according to the number of battery cells and the thickness of each battery cell) and the positions of the threaded holes on the inner bottom of the battery box for cooperating with the end clamping plate 1, the fixing bracket 7, and the tab fixing block 2. Then, the end clamping plate 1, the fixing bracket 7, the tab fixing block 2 (directly fixed on the inner bottom of the battery box), and all the battery cells 3 are sequentially placed on the inner bottom of the battery box. Bolts are passed through the through holes on the end clamping plate 1, the fixing bracket 7, and the tab fixing block 2 and screwed into the threaded holes on the inner bottom of the battery box, so as to achieve the purpose of fixing the battery cell body.

[0055] Then, after the positive and negative electrode tabs of the two battery cells 3 are brought into contact and folded, a pressing block 4 is used to press the electrode tabs to prevent loose connection. Bolts are passed through the through holes in the pressing block 4 and screwed into the threaded holes in the electrode tab fixing block 2 to achieve the purpose of fixing the electrode tabs 5 of the battery cells.

[0056] Only some exemplary embodiments of the present invention have been described by way of illustration above. Without doubt, for those of ordinary skill in the art, various different ways can be used to modify the described embodiments without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A fixing device for a CTP soft-pack battery cell, characterized in that, Comprising: Two end clamping plates (1) arranged in parallel with each other; A plurality of battery cells (3) evenly distributed between the two end clamping plates (1); and A pressing block (4) and a battery cell tab (5) fixedly connected to the end of the battery cell (3); The battery cell tab (5) is fixedly connected with a tab fixing block (2), and the pressing block (4) is arranged above the battery cell tab (5) corresponding to the battery cell (3); further comprising A first bolt, which passes through a countersunk through hole (11) in the pressing block (4) and the tab fixing block (2) and is threadedly connected to a threaded hole opened at the bottom of the box body. A connecting lug (12) is provided on the tab fixing block (2), and the tab fixing block (2) and a hole of a fixing bracket (7) are snap-connected through the connecting lug (12); Among them, the battery cell tab (5) at the tab outlet position is fixedly connected to the end clamping plate (1) by a second bolt sequentially passing through the pressing block (4), an outlet fixing block (8) and an outlet connecting bracket (9); further comprising A pressing plate (6), the two ends of which are respectively fixedly connected to the end clamping plate (1).

2. The fixing device for a CTP soft-pack battery cell according to claim 1, characterized in that ； A tab fixing hole (10) is arranged on one side of the countersunk through hole (11) at the top of the tab fixing block (2), and the battery cell tab (5) and the pressing block (4) are fixedly connected through the tab fixing hole (10). The bottom of the tab fixing block (2) is screwed to the battery box body through the countersunk through hole (11). A connecting lug (12) is arranged on the side of the tab fixing block (2), and the connecting lug (12) is snap-connected to a hole on the fixing bracket (7) with an interference fit.

3. A fixing device for a CTP soft-pack battery cell according to claim 1, It is characterized in that; The top of the outlet fixing block (8) is provided with a tab fixing hole (10) and a through hole (13). The battery cell tab (5) is fixedly connected through the tab fixing hole (10), and the second bolt is installed through the through hole (13).

4. The fixing device for a CTP soft-pack battery cell according to claim 1, wherein ； A first flanging and a second flanging are sequentially arranged at the bottom and the middle of the same side of the end clamping plate (1). A box body connecting hole (16) is opened on the first flanging, and a pressing plate connecting hole (18) and a clearance hole (17) are opened on the second flanging.

5. The fixing device for a CTP soft-pack battery cell according to claim 4, characterized in that ； A plurality of weight-reducing holes (15) are opened on the surface of the end clamping plate (1).

6. The fixing device for a CTP soft-pack battery cell according to claim 1, characterized in that ； A flame-retardant foam with a thickness of 0.5 - 1 mm is arranged between two adjacent battery cells (3).

7. The fixing device for a CTP soft-pack battery cell according to claim 6, characterized in that ； The flame-retardant foam is 0.8 mm.

8. The fixing device for a CTP soft-pack battery cell according to claim 1, wherein ； A flame-retardant foam is arranged between the end clamping plate (1) and the battery cell (3), and a buffer foam is arranged between the pressing plate (6) and the top of the battery cell (3).

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