Assembled lithium battery module and lithium ion battery system

Abstract

The utility model discloses an assembled lithium battery module, which comprises a lower bracket, the interior of which is divided into a plurality of first battery cell placement partitions; the lower parts of the plurality of battery cells are respectively placed in the first battery cell placing subareas; the surface, facing the battery cells, of the upper support is divided into a plurality of second battery cell containing subareas, the second battery cell containing subareas are used for containing the upper portions of the battery cells, the upper portions and the lower portions of the battery cells are jointly clamped through the lower support and the upper support, it can be guaranteed that the battery cells cannot move at will, the positions of the battery cells can be clamped more accurately, and the battery cells can be placed more accurately. The battery module further comprises the partition plates which are arranged at the large-surface gaps of the two adjacent battery cells, so that the battery cells can be absorbed by the partition plates to deform after the temperature of the battery cells is increased, the change of the overall structure of the module is not caused, and the change of resistance is not caused, so that the cycle life of the battery cells can be prolonged; and safe and stable operation of an energy storage or communication system is better ensured. The lithium ion battery system provided by the utility model has the same advantages.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery manufacturing technology field, more specifically, relate to a kind of assembled lithium battery module and lithium ion battery system. BACKGROUND

[0002] With the continuous development of lithium battery industry, the safety of lithium battery is continuously improved, the cost is continuously reduced, and the energy density is continuously improved. These factors make more and more fields use lithium battery to supply power. Among them, the battery module as the smallest module unit, it can connect multiple cells, and determines the safety, structural strength and assembly efficiency of the whole battery system.

[0003] The connection mode between the existing battery modules is to arrange them in a row and then wrap them into a whole with glass fiber glue, or to cover the bottom of the battery with a simple plastic frame structure. Although the direct close combination mode between the cells in these schemes is simple, the size deviation is large, and the overall shape is not regular, so it is not convenient to assemble multiple modules together, and the overall structural strength is low. When used in a vibrating environment, the cells are easy to shift, which will cause the welding points to fall off, thus easily leading to product defects. In addition, since the cells in the battery module have no constraint structure, if the cells swell during charging and discharging, the internal structure of the cells will change, thus increasing the internal resistance, which will reduce the cycle life of the cells. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the utility model provides an assembled lithium battery module and a lithium ion battery system, which can improve the structural strength and stability, improve the cycle life of the cells, and better guarantee the safe and stable operation of the energy storage or communication system.

[0005] The assembled lithium battery module provided by the utility model comprises:

[0006] A lower support, the inner part of the lower support is separated into a plurality of first cell placement partitions;

[0007] A plurality of cells, the lower part of each cell is placed in the first cell placement partition;

[0008] An upper support, the surface of the upper support facing the cells is separated into a plurality of second cell placement partitions, and the second cell placement partitions are used to accommodate the upper part of the cells;

[0009] A partition plate is arranged at the large surface gap between two adjacent cells.

[0010] Preferably, in the assembled lithium battery module, the surface of the upper support away from the battery cell has a connecting row limiting part, and the inside of the connecting row limiting part is used for accommodating and limiting the connecting row.

[0011] Preferably, in the assembled lithium battery module, the surface of the upper support away from the battery cell further has a wire limiting part, and the inside of the wire limiting part is used for accommodating and limiting the wire.

[0012] Preferably, in the assembled lithium battery module, further comprising:

[0013] An insulating cover plate is arranged on the upper support and located at the upper part of the connecting row limiting part.

[0014] Preferably, in the assembled lithium battery module, the upper support has a cover plate limiting undercut, and the insulating cover plate is buckled together with the upper support by the cover plate limiting undercut.

[0015] Preferably, in the assembled lithium battery module, the upper support further has a pole mounting hole for allowing the pole of the battery cell to pass through and communicate with the outside.

[0016] Preferably, in the assembled lithium battery module, the separator is a hard plastic separator with a thickness of 0.8mm to 1.5mm.

[0017] Preferably, in the assembled lithium battery module, the side surface of the upper support has an output row leading-out part, and the output row leading-out part is provided with a protective cover.

[0018] Preferably, in the assembled lithium battery module, the output row leading-out part is provided with a protective cover buckle, the side surface of the protective cover is provided with a square mounting hole, and the protective cover and the upper support are connected by cooperation of the protective cover buckle and the square mounting hole.

[0019] The lithium ion battery system provided by the application comprises:

[0020] The battery management system comprises:

[0021] The assembled lithium battery module as claimed in any one of the preceding claims is in communication connection with the battery management system.

[0022] It can be seen from the technical scheme that the above-mentioned assembled lithium battery module has the advantages that the lower support is arranged, and the inside of the lower support is separated into a plurality of first battery cell placing partitions; a plurality of battery cells are arranged in the first battery cell placing partitions; the surface of the upper support facing the battery cells is separated into a plurality of second battery cell placing partitions, and the second battery cell placing partitions are used for accommodating the upper parts of the battery cells, so that the upper parts and the lower parts of the battery cells are clamped by the lower support and the upper support, the movement of the battery cells is prevented, the positions of the battery cells are clamped more accurately, the positions of the battery cells are better positioned during installation, the structural strength and the structural stability are improved, the cycle life of the battery cells is improved, and the safe and stable operation of the energy storage or communication system is better ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order 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 needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0024] Figure 1 An explosion schematic view of an embodiment of the assembled lithium battery module provided by the present application;

[0025] Figure 2 A top view of the upper support of the assembled lithium battery module provided by the present application;

[0026] Figure 3 An enlarged schematic view of an output row leading part;

[0027] Figure 4 An enlarged schematic view of a protective cover;

[0028] Figure 5 A schematic view of the above-mentioned assembled lithium battery module installed in a case. DETAILED DESCRIPTION

[0029] The core of the present application is to provide an assembled lithium battery module and a lithium ion battery system, which can improve the structural strength and the structural stability, improve the cycle life of the battery cells, and better ensure the safe and stable operation of the energy storage or communication system.

[0030] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor fall within the scope of the present utility model.

[0031] The embodiment of the assembled lithium battery module provided by the present utility model is shown in the accompanying drawings. Figure 1 Figure 1 The embodiment of the assembled lithium battery module provided by the present utility model is shown in the accompanying drawings.

[0032] The lower support 1 is internally partitioned into a plurality of first battery cell placement partitions 11. Specifically, a plurality of mutually parallel protruding structures can be used to partition, and the size of each first battery cell placement partition 11 matches the size of the battery cell placed therein, so as to ensure that each battery cell can be stationary in the first battery cell placement partition 11 and will not move during operation. In addition, the size of the first battery cell placement partition 11 can also be set slightly smaller than the size of the battery cell, for example, the length of the first battery cell placement partition 11 can be slightly shorter than the length of the battery cell, and the width of the first battery cell placement partition 11 can also be slightly shorter than the width of the battery cell. In this way, when the battery cell is placed in the first battery cell placement partition 11, it can be clamped therein, forming a certain size of static friction force therebetween, so as to better ensure that the positional relationship between the two does not change. Of course, this can be selected according to actual needs. Further, the side surface of the first battery cell placement partition 11 can be provided with some microstructures that can increase roughness, such as micro protrusions, so as to further increase the static friction force therebetween, better prevent relative movement, and further enhance the stability of the structure.

[0033] A plurality of battery cells 2 are placed in the first battery cell placement partitions 11. The battery cells 2 can be, but are not limited to, square aluminum shell battery cells. The number of first battery cell placement partitions 11 can be determined according to the number of battery cells needed to be placed in the module, so as to fill the first battery cell placement partitions 11 and form a compact overall module. The lower part of the battery cell 2 is effectively limited by the first battery cell placement partition 11, so as to avoid movement during operation.

[0034] The upper support 3 is partitioned into a plurality of second battery cell placement partitions on the surface facing the battery cell 2. Since it is located on the lower surface, the second battery cell placement partitions are not shown in the drawings. Figure 1 ​The second cell placement partition (not shown) is used to accommodate the upper part of the cell 2. Specifically, the second cell placement partition can also be separated by a plurality of protruding structures parallel to each other, the lower part of the cell is limited by the lower support, and the upper part of the cell is limited by the upper support. In this way, each cell can be in its correct position without deviation, thereby ensuring that the overall size of the entire battery module does not deviate. The size of each second cell placement partition can also be slightly smaller than the size of the cell placed therein. For example, the length of the second cell placement partition can be slightly shorter than the length of the cell, and the width of the second cell placement partition can be slightly smaller than the width of the cell. In this way, when the upper part of the cell is placed in the second cell placement partition, it can be clamped therein, and a certain size of static friction is formed between the two. This can better ensure that the positional relationship between the two does not change. Of course, this can be selected according to actual needs. Further, the side surface of the second cell placement partition can be provided with microstructures that can increase roughness, such as micro protrusions. In this way, the static friction can be further increased.

[0035] The separator 4 is arranged at the large surface gap between two adjacent cells 2, that is, between the sides of the two adjacent cells with the largest area. When a cell expands due to excessive temperature, it will transmit the expansion to the adjacent separator 4, and the separator 4 at this position will be compressed to a certain degree of deformation. Finally, the deformation is absorbed by the separator 4, and the deformation is not transmitted to the adjacent cell, so that the deformation of the other cell does not occur, thereby reducing the service life of the other cell. Therefore, the separator structure can effectively absorb the expansion of the cell to ensure that the battery does not shorten the service life due to the expansion of the cell 2. The shape, thickness, and structure of the separator 4 selected here are not limited, as long as it can absorb the expansion of the cell 2. For example, the separator 4 can be a rectangular plate as shown in the figure. The area of the largest side can be the same as the area of the largest side of the cell 2 to achieve close contact at each position. The expansion of each part of the cell can be absorbed, and the protection effect of the cell is better. Of course, it can also be adjusted according to actual needs, which is not limited here.

[0036] From the above technical scheme can be seen, the utility model provides the above assembled lithium battery module's embodiment, because including lower support, the inside of lower support is separated into a plurality of first electric core placement partition, a plurality of electric core, the lower part of electric core is placed in first electric core placement partition respectively, upper support, the surface of upper support towards electric core is separated into a plurality of second electric core placement partition, second electric core placement partition is used to accommodate the upper part of electric core, therefore utilizes lower support and upper support and the upper part and lower part of each electric core are stuck together, can guarantee that electric core will not move at will, and the position of electric core will be more accurate, and installation can be better positioned, thereby can improve structural strength and structural stability, and because also including baffle, is arranged at the large surface gap of adjacent two electric cores, like this when the temperature of electric core rises, will be absorbed by baffle and deformed, will not cause the change of module overall structure, will not lead to resistance change, thereby the cycle life of electric core can also be improved, and the safe and stable operation of energy storage or communication system is better guaranteed.

[0037] In one specific embodiment of the above assembled lithium battery module, with reference to Figure 1 and Figure 2 , Figure 2 the top view of the upper support of the assembled lithium battery module provided by the present application, the surface of the upper support 3 away from the electric core 2 (that is, the top surface in Figure 1 , has a connection row limiting part 31, the inside of the connection row limiting part 31 is used to accommodate and limit the connection row 32, and the connection row 32 here can be but is not limited to aluminum row, using such a connection row limiting part 31 can ensure that each connection row 32 is in the correct position, and will not shift in the up-down direction during transfer and welding, so that the alignment can be more accurate during welding, to improve the welding quality to a greater extent, so as to ensure that the structure of the entire battery module is more compact and firm. The shape and size of the connection row limiting part 31 should match the shape and size of the connection row to ensure effective limiting. In addition, the connection row limiting part 31 can include a connection row limiting frame 311 and a connection row limiting buckle 312 as shown in Figure 2 . In this case, after placing the connection row in the connection row limiting frame 311, the connection row limiting buckle 312 can be used to clamp the side of the connection row to prevent the connection row from moving. The number of connection row limiting buckles 312 can be selected according to actual needs, for example, connection row limiting buckles 312 can be provided on opposite edges of the connection row limiting frame 311 to fix the two opposite edges of the connection row, or they can be provided on all four edges to achieve more secure fixation, which can be selected according to actual needs.

[0038] Further, in another embodiment of the assembled lithium battery module, the surface of the upper support 3 facing away from the battery cell 2 also has a wire limiting component 33, the inside of which is used to accommodate and limit the wire. The wire limiting component can preferably be a wire slot, so that multiple wires can be squeezed into the wire slot to avoid movement or falling off. Specifically, the wire can be, but is not limited to, the wire of the module detection line. By using the wire limiting component 33 to limit the wire inside, the wire can be prevented from being exposed outside in a disorderly manner, and the friction between different wires can also be avoided, thereby better ensuring the safety and aesthetics of the detection line wire.

[0039] Further, in another embodiment of the assembled lithium battery module, continuing to refer to Figure 1 The assembled lithium battery module can also include:

[0040] An insulating cover plate 5 is arranged on the upper support 3 and located at the upper part of the connecting row limiting component 31. The insulating cover plate 5 can preferably be an epoxy cover plate. By using the insulating cover plate 5, the connecting row and the wire and other components can be covered, avoiding exposure of these components, and the risk of electric shock can be avoided, thereby ensuring better safety of the module. In one specific implementation, the upper support 3 can have a cover plate limiting undercut 37, and the insulating cover plate 5 can be fastened with the upper support 3 by using the cover plate limiting undercut 37. This can ensure more secure connection and avoid falling off during work, thereby better ensuring safety, and the cover plate 5 is easy to disassemble. Of course, other ways such as buckles, bolt connections, etc. can also be used, and this is not limited. Figure 1 A cover plate mounting hole 51 is also shown. The upper surface of the upper support 3 can be fixed by passing through the cover plate mounting hole 51 and using related components such as bolts and nuts. The mounting can be a buckle type mounting, or a bolt connection, and this is not limited. The more connection parts, the more stable the connection, which can be selected according to actual needs.

[0041] In any embodiment of the assembled lithium battery module, continuing to refer to Figure 2The upper support 3 can also have a pole mounting hole 34 for the pole of the battery cell 2 to pass through and communicate with the outside, that is, the pole protrudes out after passing through the pole mounting hole 34, so as to be electrically connected with other components outside, thereby realizing the output of electric energy. The use of the pole mounting hole does not affect the output of electric energy. The shape of the pole mounting hole 34 can be circular or square, and the diameter or side length can be the same as or slightly larger than the diameter or side length of the pole, which can be selected according to actual needs, and is not limited herein. The pole can be connected with the connecting row by laser welding. After the connecting row is limited by the limiting part 31, the position of laser welding can be positioned more accurately, thereby avoiding the problem of false welding and improving the consistency and yield of welding. In addition, the overall structure is more firm.

[0042] On the basis of any embodiment of the assembled lithium battery module, the separator 4 can be preferably a hard plastic separator with a thickness of 0.8mm to 1.5mm, and further, the thickness can be preferably 1.0mm, which can be selected according to actual needs, as long as it can effectively absorb the deformation caused by the heat of the battery cell. In addition, the hard plastic can be preferably made of a mixture of ABS (acrylonitrile-butadiene-styrene copolymer) and PC (polycarbonate). The mixture of the two is an existing material, and the present embodiment does not improve it. Of course, other thicknesses and other materials of the separator can also be selected according to actual needs, such as POM (polyoxymethylene), PS (polystyrene), PET (polyethylene terephthalate), etc., which are not limited herein.

[0043] On the basis of any embodiment of the assembled lithium battery module, continue to refer to Figure 1 The side surface of the upper support 3 has an output row leading-out part 35, and the output row leading-out part 35 is provided with a protective cover 36. It should be noted that the output row leading-out part 35 functions to output current, and the installation of the protective cover 36 can ensure the insulation protection of the positive and negative output parts, thereby making the entire module safer. Further, refer to Figure 3 and Figure 4 , Figure 3 is an enlarged schematic view of the output row leading-out part, Figure 4 is an enlarged schematic view of the protective cover. The output row leading-out part 35 is provided with a protective cover buckle 351, and the side surface of the protective cover 36 is provided with a square mounting hole 361. The protective cover 36 and the upper support 3 are connected by the cooperation between the protective cover buckle 351 and the square mounting hole 361. In this way, a more secure connection can be achieved, and the overall structure is more compact, thereby further improving the safety of the module.

[0044] It is also necessary to explain that the reference Figure 5 , Figure 5 Assembled lithium battery module 51 can be fixed in cabinet 52 by pressing plate 53 to improve the stability of the module structure, so as to prevent the battery from being damaged by the external force of pressing plate 53. Figure 5 It can be seen that two assembled lithium battery modules can be installed in a cabinet 52, of course, a larger cabinet can be selected to accommodate more modules according to actual needs, which is not limited here, and at this time it can be seen that the separator 54 is also used between the pressing plate 53 and the battery cell in the assembled lithium battery module 51, which can not only absorb the expansion deformation of the battery cell to ensure longer battery life, but also absorb the external force caused by the pressing plate 53 to avoid damage to the battery cell by the pressing plate 53, and better ensure the safety of the assembled lithium battery module.

[0045] The embodiments of the lithium ion battery system provided by the utility model can include:

[0046] Battery management system:

[0047] The assembled lithium battery module as any one of the above communicates with the battery management system.

[0048] Because the above-mentioned assembled lithium battery module uses the upper bracket and the lower bracket to buckle the battery cell together, and adds the structure of the separator, while ensuring the precision of the battery module size, it can effectively absorb the battery expansion, ensure that the battery will not shorten the service life due to the expansion of the battery, and the overall structure is more stable, avoiding false welding, so as to improve the welding consistency and yield, so that the lithium ion battery system with such assembled lithium battery module has the same advantages.

[0049] The above description of the disclosed embodiments enables those skilled in the art to implement or use the utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An assembled lithium battery module, characterized in that, include: The lower support is internally divided into multiple first cell placement zones; Multiple battery cells, the lower parts of which are respectively placed in the first battery cell placement partition; An upper support is provided, wherein the surface of the upper support facing the battery cell is divided into a plurality of second battery cell placement partitions, the second battery cell placement partitions being used to accommodate the upper part of the battery cell; A partition is disposed at the large surface gap between two adjacent battery cells.

2. The assembled lithium battery module according to claim 1, characterized in that, The surface of the upper bracket facing away from the battery cell has a connecting bar limiting component, the interior of which is used to accommodate and limit the connecting bar.

3. The assembled lithium battery module according to claim 2, characterized in that, The surface of the upper bracket facing away from the battery cell also has a wiring limiting component, the interior of which is used to accommodate and limit the wiring.

4. The assembled lithium battery module according to claim 3, characterized in that, Also includes: An insulating cover plate is disposed on the upper bracket and located above the connecting row limiting component.

5. The assembled lithium battery module according to claim 4, characterized in that, The upper bracket has a cover plate limiting buckle, and the insulating cover plate is fastened to the upper bracket by means of the cover plate limiting buckle.

6. The assembled lithium battery module according to any one of claims 1-5, characterized in that, The upper bracket also has a terminal mounting hole, which is used to allow the terminal of the battery cell to pass through and communicate with the outside.

7. The assembled lithium battery module according to any one of claims 1-5, characterized in that, The partition is a rigid plastic partition with a thickness of 0.8 mm to 1.5 mm.

8. The assembled lithium battery module according to any one of claims 1-5, characterized in that, The upper bracket has an output outlet on its side, and the output outlet is fitted with a protective cover.

9. The assembled lithium battery module according to claim 8, characterized in that, The output outlet is equipped with a protective cover buckle, and the protective cover has a square mounting hole on its side. The protective cover and the upper bracket are connected by the cooperation of the protective cover buckle and the square mounting hole.

10. A lithium-ion battery system, characterized in that, include: Battery Management System: The assembled lithium battery module as described in any one of claims 1-9 is communicatively connected to the battery management system.

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