Lithium battery module with cushion pad

Abstract

The utility model belongs to the technical field of lithium battery modules, and particularly relates to a lithium battery module with a buffer cushion, which comprises a base, a plurality of single cells are arranged on the base, a partition plate is arranged on one side of each single cell, the buffer cushion is arranged on one side, facing the single cells, of the partition plate, and the buffer cushion is arranged on the other side of the partition plate. The base is provided with a plurality of single battery cells, the surface of each single battery cell is covered with a limiting mechanism for fixing the single battery cell, the base is provided with a frame, the frame comprises two baffles, and the baffles are used for fixing all the single battery cells. According to the utility model, the buffer gasket is placed between the single cells, so that the buffer gasket can be used for detecting the pressure and the intensity of pressure in the long-term service life of the single cells, and can also be used for assembling modules between the single cells, thereby obtaining a module with better safety and calendar life consistency.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery modules, and in particular relates to a lithium battery module with a buffer pad. Background Art

[0002] During the entire life of the battery cell, there will be differences in thickness during processing, consistency voltage, and SOC between the individual battery cells. Lithium deposition due to cell failure will cause the thickness of the negative electrode plate to increase, which will lead to differences in expansion force between the battery cells.

[0003] In the prior art, after the lithium battery is assembled into a module, it is necessary to calibrate whether the pre-tightening force of the entire module meets the product specifications. However, the battery cells are generally arranged and assembled with a constant gap, and thermal insulation pads, buffer pads, etc. are added in between. The tightening force between the battery cells cannot be monitored. When the module fails, the difference in expansion force of the single battery cells cannot be monitored. It is difficult to prevent module failure or battery pack failure caused by single battery cells. Utility Model Content

[0004] The utility model is to solve the technical problems raised in the background technology and provides a lithium battery module with a buffer pad.

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

[0006] A lithium battery module with a buffer pad comprises a base, a plurality of single cells are arranged on the base, a partition is arranged on one side of each single cell, and a buffer pad is arranged on the side of the partition facing the single cell, a limiting mechanism for fixing the single cell is covered on the surface of each single cell, and the base is provided with a frame, the frame comprises two baffles, and the baffles are used to fix all the single cells.

[0007] Preferably, the limiting mechanism includes a first mounting plate, a U-shaped plate, and a second mounting plate, the U-shaped plate covers the surface of the single cell, the first mounting plate and the second mounting plate are respectively connected to the two ends of the U-shaped plate, a third connecting axis connected to the limiting mechanism is provided on one side of each partition, a card is provided on the upper surface of each U-shaped plate, the card is clamped with the partition on one side, a card slot is provided between the side edges of one side of the two baffles, and the card slot is clamped with the limiting mechanism.

[0008] Preferably, the connection between the U-shaped plate and the first mounting plate is provided with a convex strip, the convex strip is clamped in the clamping groove, and the lower ends of the two baffles are provided with a folding strip, and the folding strip is fixedly connected to the base by bolts.

[0009] Preferably, a second connecting shaft is provided at the connection between the U-shaped plate and the second mounting plate, a first connecting shaft corresponding to the second connecting shaft is provided on the second mounting plate, the third connecting shaft is provided on one side of the first connecting shaft, and two upper and lower threaded rods are threadedly inserted between the third connecting shafts, the first connecting shaft and the second connecting shaft, and nuts are threadedly sleeved on both ends of the threaded rods.

[0010] Preferably, an I-shaped plate is provided between the first connecting shaft and the second connecting shaft, the upper and lower ends of the I-shaped plate are respectively abutted against the end faces of the first connecting shaft and the second connecting shaft, and the threaded rod also threads through the I-shaped plate.

[0011] Preferably, a clamping block is provided on the inner surface of the upper end of the I-shaped plate, and grooves corresponding to the clamping block are provided on the first connecting shaft, the third connecting shaft and the second connecting shaft, and the clamping block is clamped in the groove.

[0012] Preferably, a thin film pressure sensor is arranged on the surface of the buffer pad, and the buffer pad is made of high temperature resistant heat insulating material.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. By placing a buffer pad with detection effect on one side of the single cell in the lithium battery module, the expansion force distribution cloud map, maximum pressure, average pressure, force area, and total pressure changes over time during the entire cycle can be monitored in real time, so that the use of the single cell can be known in real time, and the module failure caused by the failure of the single cell can be effectively prevented;

[0015] 2. By placing this buffer gasket between each single cell, it can not only be used for pressure and pressure detection during the long-term life of the single cell, but also can be used for module assembly between single cells to obtain a module with better safety and calendar life consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the front structure of a lithium battery module with a buffer pad proposed by the utility model;

[0017] Figure 2 This is a schematic diagram of the back structure of a lithium battery module with a buffer pad proposed by the utility model;

[0018] Figure 3 This is a schematic diagram of the installation structure on one side of a single battery cell;

[0019] Figure 4 This is a schematic diagram of the installation structure on the other side of a single battery cell.

[0020] In the figure: 1 base, 2 U-shaped plate, 3 partition, 4 single battery cell, 5 card, 6 buffer pad, 7 first mounting plate, 8 baffle, 9 folding strip, 10 convex strip, 11 card slot, 12 first connecting shaft, 13 third connecting shaft, 14 threaded rod, 15 nut, 16 I-shaped plate, 17 second connecting shaft, 18 second mounting plate, 19 card block. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] Reference Figure 1-Figure 4 A lithium battery module with a buffer pad comprises a base 1, a plurality of single cells 4 are arranged on the base 1, some of each single cell 4 are provided with a partition 3, a buffer pad 6 is arranged on the side of the partition 3 facing the single cell 4, and a limiting mechanism is arranged on the surface of each single cell 4, the limiting mechanism comprises a first mounting plate 7, a U-shaped plate 2, and a second mounting plate 18, the U-shaped plate 2 covers the surface of the single cell 4, and the first mounting plate 7 and the second mounting plate 18 are respectively connected to both ends of the U-shaped plate 2;

[0024] A third connecting shaft 13 is provided on one side of each partition 3, and the third connecting shaft 13 is connected to the limiting mechanism. A card 5 is provided on the upper surface of each U-shaped plate 2, and the card 5 is clamped with the partition 3 on one side; a frame is provided on the base 1, and the frame includes two baffles 8. A card slot 11 is provided between the side edges of one side of the two baffles 8, and the card slot 11 is clamped with the limiting mechanism.

[0025] A thin film pressure sensor is arranged on the surface of the buffer pad 6. The material of the buffer pad 6 is a high temperature resistant heat insulating material. The heat resistant material of the buffer pad 6 is not limited to inorganic ceramic heat resistant particle filling and high heat resistant fiber filling. The thin film pressure sensor is an existing technology, composed of polyester film, high conductive material and nano pressure sensitive material. Thousands of sensors are evenly distributed in the thin film sheet, which can monitor in real time the expansion force distribution cloud map, maximum pressure, average pressure, force area, and total pressure changes over time during the charging and discharging of the battery cell during the entire cycle, that is, the pressure test point in the schematic diagram, and can monitor the changes in force and pressure in real time.

[0026] The connection between the U-shaped plate 2 and the first mounting plate 7 is provided with a convex strip 10, which is clamped in the clamping groove 11. The lower ends of the two baffles 8 are provided with a folding strip 9, which is fixedly connected to the base 1 by bolts. The baffles 8 fix the integrated single cells 4 as a whole, and the two baffles 8 can be fixedly installed on the base 1 by bolts.

[0027] A second connecting shaft 17 is provided at the connection between the U-shaped plate 2 and the second mounting plate 18, a first connecting shaft 12 corresponding to the second connecting shaft 17 is provided on the second mounting plate 18, a third connecting shaft 13 is provided on one side of the first connecting shaft 12, and two upper and lower threaded rods 14 are threadedly inserted between the plurality of third connecting shafts 13, the first connecting shafts 12, and the second connecting shafts 17, and nuts 15 are threadedly sleeved at both ends of the threaded rods 14. The U-shaped plate 2 and the second mounting plate 18 are clamped together by the first connecting shaft 12 and the second connecting shaft 17, so that the single cell 4 can be covered in the limiting mechanism, and then the plurality of first connecting shafts 12, the third connecting shafts 13, and the second connecting shaft 17 are connected together by the threaded rods 14, thereby realizing the installation and fixation of the single cell 4 and the partition 3 on the base 1.

[0028] An I-shaped plate 16 is arranged between the first connecting shaft 12 and the second connecting shaft 17. The upper and lower ends of the I-shaped plate 16 are respectively against the end faces of the first connecting shaft 12 and the second connecting shaft 17, and the threaded rod 14 also passes through the I-shaped plate 16 through a thread. In order to improve the stability of the installation connection between the U-shaped plate 2 and the second mounting plate 18, an I-shaped plate 16 is arranged between them to limit the end face position. A clamping block 19 is arranged on the inner surface of the upper end of the I-shaped plate 16. The first connecting shaft 12, the third connecting shaft 13, and the second connecting shaft 17 are provided with grooves corresponding to the clamping block 19, and the clamping block 19 is clamped in the groove. The threaded rod 14 passes through the I-shaped plate 16 through a thread. In order to avoid thread slippage of the threaded connection, a clamping block 19 is arranged at the upper end of the I-shaped plate 16. The clamping block 19 and the angle are limited to make the entire structure more stable.

[0029] A plurality of single cells 4 are sequentially mounted on the base 1, and a partition 3 is correspondingly provided for each base 1. The base 1 and the partition 3 are fitted together. After the plurality of partitions 3 and the single cells 4 are arranged and installed, a U-shaped plate 2 is then placed on the upper end of each single cell 4. One end of the U-shaped plate 2 is connected to the first mounting plate 7, and the other end is connected to the second mounting plate 18. When the U-shaped plate 2 is connected to the second mounting plate 18, the U-shaped plate 2 is clamped with the second mounting plate 18 from top to bottom. The first connecting shaft 12 and the second connecting shaft 17 are staggered from each other, and can be clamped together when the upper and lower parts are in contact. , the block 19 at the upper end of the I-shaped plate 16 is placed into the groove, and then the I-shaped plate 16 is rotated to realize the clamping connection between the I-shaped plate 16 and the first connecting shaft 12, the third connecting shaft 13, and the second connecting shaft 17. The first connecting shaft 12, the third connecting shaft 13, and the second connecting shaft 17 are clamped together by the I-shaped plate 16, so that the relative angle position between the partition 3 and the single battery cell 4 is fixed. After the assembly of multiple single battery cells 4 is completed, the two threaded rods 14 are threaded through the multiple first connecting shafts 12, the third connecting shafts 13, and the second connecting shafts 17 to further strengthen the overall structure;

[0030] Multiple single cells 4 are snapped into the frame from one side, and two baffles 8 are respectively abutted against the single cells 4 at both ends. Since one single cell 4 corresponds to one partition 3, one baffle 8 is fitted with the surface of the single cell 4, and the other baffle 8 is fitted with the surface of the partition 3. When snapping in from one side, the convex strip 10 will be snapped into the slot 11, and then the baffle 8 is fixedly installed on the base 1 by bolts, thereby realizing the installation of the entire module.

[0031] When the module is assembled, a certain initial preload force is applied to the single cell 4. As the single cell 4 is charged and discharged, the cell pole piece expands and generates a certain force, which acts on the sensor. Thousands of sensors are evenly distributed inside the buffer pad 6. The expansion force distribution cloud map, maximum pressure, average pressure, force area, and total pressure changes over time during the entire cycle can be monitored in real time. The buffer pad 6 is made of aerogel material, which is resistant to high temperature and has buffering and compressibility. It is a uniformly distributed pressure sensor, which can analyze the distribution relationship between the single cell 4 and pressure. Through this buffer pad 6, not only can the pressure and pressure of the single cell 4 be detected during its long life, but it can also be protected when assembling modules between the single cells 4.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A lithium battery module with a buffer pad, comprising a base (1), on which a plurality of single cells (4) are arranged, characterized in that: A partition (3) is provided on one side of each of the single cells (4), and a buffer pad (6) is provided on the side of the partition (3) facing the single cell (4). A limiting mechanism for fixing the single cell (4) is covered on the surface of each of the single cells (4). The base (1) is provided with a frame, and the frame includes two baffles (8). The baffles (8) are used to fix all the single cells (4).

2. A lithium battery module with a buffer pad according to claim 1, characterized in that: The limiting mechanism comprises a first mounting plate (7), a U-shaped plate (2), and a second mounting plate (18); the U-shaped plate (2) covers the surface of the single cell (4); the first mounting plate (7) and the second mounting plate (18) are respectively connected to the two ends of the U-shaped plate (2); a third connecting shaft (13) connected to the limiting mechanism is provided on one side of each of the partitions (3); a card (5) is provided on the upper surface of each of the U-shaped plates (2); the card (5) is clamped with the partition (3) on one side; a clamping groove (11) is provided between the side edges of one side of the two baffles (8); the clamping groove (11) is clamped with the limiting mechanism.

3. A lithium battery module with a buffer pad according to claim 2, characterized in that: The connection between the U-shaped plate (2) and the first mounting plate (7) is provided with a convex strip (10), the convex strip (10) is clamped in the clamping groove (11), and the lower ends of the two baffles (8) are provided with a folding strip (9), and the folding strip (9) is fixedly connected to the base (1) by bolts.

4. A lithium battery module with a buffer pad according to claim 2, characterized in that: A second connecting shaft (17) is arranged at the connection between the U-shaped plate (2) and the second mounting plate (18); a first connecting shaft (12) corresponding to the second connecting shaft (17) is arranged on the second mounting plate (18); the third connecting shaft (13) is arranged on one side of the first connecting shaft (12); two upper and lower threaded rods (14) are threadedly inserted between the third connecting shafts (13), the first connecting shafts (12) and the second connecting shafts (17); and nuts (15) are threadedly sleeved at both ends of the threaded rods (14).

5. A lithium battery module with a buffer pad according to claim 4, characterized in that: An I-shaped plate (16) is provided between the first connecting shaft (12) and the second connecting shaft (17); upper and lower ends of the I-shaped plate (16) respectively abut against end surfaces of the first connecting shaft (12) and the second connecting shaft (17); and the threaded rod (14) also threads through the I-shaped plate (16).

6. A lithium battery module with a buffer pad according to claim 5, characterized in that: A clamping block (19) is provided on the inner surface of the upper end of the I-shaped plate (16); grooves corresponding to the clamping block (19) are provided on the first connecting shaft (12), the third connecting shaft (13) and the second connecting shaft (17); and the clamping block (19) is clamped in the grooves.

7. The lithium battery module with a buffer pad according to claim 1, characterized in that: A thin film pressure sensor is arranged on the surface of the buffer pad (6), and the buffer pad (6) is made of a high temperature resistant heat insulating material.

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