Lithium battery cell installation mechanism and lithium battery module

Abstract

The present invention relates to a lithium battery cell installation mechanism and a lithium battery module. It solves the defects of the prior art such as unreasonable design. The lithium battery cell installation mechanism comprises a frame formed by fixing a plurality of middle frames in the thickness direction; a plurality of heat sinks are arranged in parallel and spaced from each other; the heat sink is placed in the frame and partially closes the internal space of the frame; a plurality of connecting holes connecting the inside of the frame with the outside are respectively provided on each of the plurality of surfaces on the outer circumference of the frame; a bending portion extending into the connecting hole on the surface is respectively provided on the circumference of each heat sink; the bending portion and the heat sink arranged on the circumference of the same heat sink form a lithium battery cell installation groove, and a lithium battery cell installation space is formed between one of the lithium battery cell installation grooves of two adjacent heat sinks and one of the heat sinks. Advantages of the present application: improved heat dissipation performance and assembly efficiency, and extended service life.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium battery cell installation mechanism and a lithium battery module. Background Art

[0002] The new energy industry has developed rapidly recently. Lithium-ion batteries are widely used as carriers of new energy storage. Lithium-ion battery modules are the basic modules for the use of lithium batteries. Only after lithium-ion batteries are made into modules can they be conveniently used in various new energy industries.

[0003] At present, when the lithium battery modules in the industry are assembled, zero compression force or an initial constant compression force will be applied to the lithium battery cells. The thickness of the lithium battery cells, whether they are square shell cells or soft pack cells, is different at the bottom, middle and top. The thickness difference of the new cells is about 0.1mm to 1mm, so when the modules are assembled, the cumulative thickness deviation of multiple cells is larger. Due to the thickness difference, the cells have poor mutual adhesion, and the poor mutual adhesion makes the temperature consistency of the cells poor, resulting in a shortened service life of the lithium battery.

[0004] Secondly, the lithium battery module assembly efficiency is low and the heat dissipation performance of the single cell is poor, which affects the service life. Summary of the invention

[0005] The purpose of the present invention is to provide a lithium battery cell installation mechanism and a lithium battery module that can solve the above technical problems.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The lithium battery cell installation mechanism includes a frame formed by fixing a plurality of middle frames in the thickness direction, and the lithium battery cell installation mechanism also includes:

[0008] The heat sinks are provided in a plurality and are spaced apart and distributed in parallel with each other;

[0009] The heat sink is placed in the frame and partially closes the internal space of the frame, and the heat sink and the interior of the frame form an unclosed space, and all the unclosed spaces are interconnected;

[0010] A plurality of communication holes for connecting the interior of the frame with the outside are respectively provided on each of the plurality of surfaces on the outer circumference of the frame;

[0011] Each of the heat sinks is provided with a bending portion extending into the connecting hole on the surface in the circumferential direction; the bending portion and the heat sink provided in the circumferential direction of the same heat sink form a lithium battery cell installation groove, and a lithium battery cell installation space is formed between one of the lithium battery cell installation grooves of two adjacent heat sinks and one of the heat sinks;

[0012] A positioning guide structure is provided between the bending portion and the communicating hole, which enables the bending portion to move along the thickness direction of the middle frame.

[0013] In the above-mentioned lithium battery cell installation mechanism, the cross section of the bent portion is U-shaped, and a side edge of the bent portion away from the heat sink extends out of the connecting hole and corresponds to the peripheral surface plane of the frame.

[0014] In the above-mentioned lithium battery cell installation mechanism, a plurality of connecting holes for connecting the inside of the frame with the outside are respectively provided on each of the three circumferential surfaces of the frame, and the bending portions are respectively provided on the three circumferential sides of each heat sink.

[0015] In the above-mentioned lithium battery cell installation mechanism, two of the bent portions are symmetrically distributed, and the remaining one of the bent portions is connected to the heat sink via a connecting plate, and the connecting plate and the heat sink form two notches.

[0016] In the above-mentioned lithium battery cell installation mechanism, a connecting groove is provided on a surface of any one of the two adjacent middle frames in the thickness direction. When the two adjacent middle frames are relatively fixed in the thickness direction, the connecting groove opening provided on one of the middle frames is closed by the other middle frame to form the above-mentioned connecting hole.

[0017] In the above-mentioned lithium battery cell installation mechanism, the positioning guide structure includes at least one guide pin arranged at the bottom of the connecting groove, and a guide hole is provided on the bending portion. The guide pin is inserted into the corresponding guide hole and the guide pin and the guide hole are clearance-matched.

[0018] In the above-mentioned lithium battery cell installation mechanism, a docking pin is provided at the outer end of the guide pin, and in the thickness direction of the two adjacent middle frames, the guide pin is provided at the bottom of the connecting groove of one of the middle frames, and an alignment hole for inserting the docking pin is provided on the other middle frame.

[0019] In the above-mentioned lithium battery cell installation mechanism, the bending portion includes a first side portion connected to the heat sink, a middle side portion connected to the first side portion, and a second side portion connected to the middle side portion; the length of the first side portion in the direction of the thickness of the middle frame is shorter than the length of the second side portion in the direction of the thickness of the middle frame.

[0020] In the above-mentioned lithium battery cell installation mechanism, the communicating hole is a rectangular through hole, and the length of the bent portion is shorter than the diameter of the long side of the rectangular through hole.

[0021] In the above-mentioned lithium battery cell installation mechanism, an insulating heat conductive sheet is provided at the bottom of the lithium battery cell installation groove.

[0022] The present application also provides a lithium battery module, which includes two adaptive adjustment end plates, each of which is provided with an adjustable clamping force mechanism on its inner surface, and the lithium battery cell installation mechanism is provided between the two adjustable clamping force mechanisms, and the adaptive adjustment end plates and all the middle frames are connected together by a screw rod; when the lithium battery installed in the lithium battery cell installation space is charged and expanded, it drives the two adjacent heat sinks to float opposite to each other in the thickness direction of the middle frame; when the lithium battery is discharged and contracted, the adjustable clamping force mechanism drives the two adjacent heat sinks to float towards each other in the thickness direction of the middle frame.

[0023] In the above-mentioned lithium battery module, a plurality of array-distributed adjustable clamping force mechanisms are respectively provided on the inner surface of each of the adaptive adjustment end plates, and the adjustable clamping force mechanisms include a fixed plate fixed to the inner surface of the adaptive adjustment end plate, and a floating plate spaced parallel to the fixed plate, a plurality of springs are provided between the fixed plate and the floating plate, and a position sensor for detecting the position of the floating plate is provided on the fixed plate or the adaptive adjustment end plate.

[0024] Compared with the existing technology, the advantages of this application are:

[0025] By using a floating heat sink that can pre-position the lithium battery cells, the assembly efficiency can be improved during the production and assembly process, ensuring the consistency of the cell installation position.

[0026] By utilizing the floating heat sink, the installation space of the lithium battery cell can be adjusted according to the charging and discharging of the lithium battery cell to ensure safety in use.

[0027] By utilizing a floating heat sink combined with interconnected unenclosed spaces, connecting holes and bends, the heat generated by the internal battery cells can be promptly directed out of the frame, thereby extending the service life of the battery cells and preventing explosions caused by excessive internal temperatures.

[0028] After the module is assembled, the adaptive adjustment end plates at both ends of the module will apply a clamping force to the battery cells. The springs in the adjustable clamping force mechanism are in a designed pre-stressed state, and the adjustable clamping force mechanisms in the left and right end plates will apply a suitable clamping force to the battery cells in the module. During the charging and discharging process of the module, when the thickness of the battery cells shrinks, the movable plate of the adjustable clamping force mechanism moves inward of the module, which will apply a clamping force to the battery cells. When the thickness of the battery cells in the module becomes thicker, the normal expansion of the battery cells will push the movable plate outward, and the pressure clamping force will increase at this time. During the charging and discharging process of the module, the thickness of the battery cells will constantly change, which will cause the springs in the adjustable clamping force mechanism to constantly compress or expand, which will continuously apply pressure to the battery cells to increase the cycle life of the module.

[0029] Multiple adjustable clamping force mechanisms are installed in the end plate. The thickness of the surface of the battery cell is inconsistent, with some places being thick and some places being thin. If a clamping force mechanism is used, the thin parts of the battery cell will not be able to receive the clamping force, and all the force will be pressed on the thick parts of the battery cell. This will cause pressure concentration and may damage the battery cell. Installing multiple adjustable clamping force mechanisms can solve the problem of concentrated clamping force caused by inconsistent battery cell thickness or no clamping force on thin parts of the battery cell.

[0030] A position sensor is designed in the end plate. When the battery cells in the module expand abnormally and uncontrollably, the expansion will press the floating plate in the adjustable clamping force mechanism. When the floating plate moves to a certain extent on both sides of the module, it will trigger the position sensing sensor to work. The sensor sends an electrical signal, requiring the module to be stopped immediately to prevent the continued use of the module from causing safety accidents, thereby serving as an early warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the exploded structure of the lithium battery cell installation mechanism provided by the present invention.

[0032] Figure 2 It is a front structural schematic diagram of the lithium battery cell installation mechanism provided by the present invention.

[0033] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure along line AA.

[0034] Figure 4 yes Figure 3 Enlarged structural diagram at J in the middle.

[0035] Figure 5 It is a schematic diagram of the installation space of the lithium battery cell provided by the present invention.

[0036] Figure 6 It is a schematic diagram of the explosion structure of the lithium battery module provided by the present invention.

[0037] Figure 7It is a schematic diagram of the exploded structure of the self-adaptive adjustment end plate and the adjustable pressing force mechanism provided by the present invention.

[0038] Figure 8 It is a structural schematic diagram of the adjustable pressing force mechanism provided by the present invention.

[0039] Fig. 9 yes Figure 8 Schematic diagram of the cross-section structure along line BB.

[0040] Fig.10 It is a schematic diagram of the exploded structure of the adjustable pressing force mechanism provided by the present invention.

[0041] In the figure, frame 1, middle frame 10, connecting groove 100, guide pin 101, docking pin 102, alignment hole 103, connecting hole 11, heat sink 2, bending part 21, guide hole 210, connecting plate 22, notch 23, insulating heat conductive plate 3, adaptive adjustment end plate 4, adjustable clamping force mechanism 5, fixed plate 50, floating plate 51, spring 52, position sensor 53, step limit column 54, screw 6, lithium battery cell 7, protective cover 8, unenclosed space K1, lithium battery cell installation space K2, lithium battery cell installation groove C1. DETAILED DESCRIPTION

[0042] The following are specific embodiments of the invention and combined with the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0043] Embodiment 1

[0044] like Figure 1 As shown, the lithium battery cell installation mechanism comprises a frame 1 formed by fixing a plurality of middle frames 10 in the thickness direction, a heat sink 2 and a lithium battery cell. The fixing method of the plurality of middle frames 10 in the thickness direction is shown in the second embodiment.

[0045] The middle frame 10 is a rectangular frame structure and the axis lines of all the middle frames 10 coincide with each other to ensure the consistency of the installation positions of the lithium battery cells.

[0046] The frame 1 forms a through passage in the axial direction, such as Figure 1-Figure 5As shown, in this embodiment, there are several heat sinks 2 and they are spaced and distributed in parallel, and the heat sinks 2 are made of aluminum. A lithium battery cell installation space K2 is formed between two adjacent heat sinks 2. Specifically, all heat sinks 2 are placed in the frame 1 and the internal space of the frame 1 is partially closed. The number of heat sinks 2 is equal to the number of middle frames 10, and there is a heat sink 2 at the center of the thickness direction of a middle frame 10, and an unclosed space K1 is formed inside the heat sink 2 and the frame 1, and all unclosed spaces K1 are interconnected; the mutual penetration of the unclosed spaces K1 can form a small channel with a cross-sectional area smaller than the cross-sectional area of ​​the through-channel, and the small channel can form a rapid heat transfer in the axial direction of the channel. At the same time, the pins of the lithium battery cell pass through the unclosed space K1 and form a fixed connection with the fixed position on the middle frame 10. This structure can form heat dissipation for both the pins and the lithium battery cell. At the same time, the lithium battery cell is installed on a floating heat sink 2. When expansion and contraction occur during charging and discharging, the position of the heat sink 2 at this time can be adaptively adjusted to prevent explosion, that is, to achieve the purpose of explosion-proof.

[0047] The following is a further optimization of the above structure:

[0048] A plurality of connecting holes 11 are provided on each of the plurality of peripheral surfaces of the frame 1 to connect the inside of the frame 1 with the outside. The connecting holes 11 are radial through holes, and their first function is to conduct the internal heat to the outside. Their second function is to guide and limit the adaptive position adjustment of the heat sink 2.

[0049] Furthermore, if Figure 1-Figure 5 As shown, the communicating hole 11 of the present embodiment is a rectangular through hole, and the communicating hole 11 is formed by the following structure: a communicating groove 100 is provided on a surface of any one of the two adjacent middle frames 10 in the thickness direction, and the communicating groove 100 connects the inside of the middle frame 10 with the outside. When the two adjacent middle frames 10 are relatively fixed in the thickness direction, the notch of the communicating groove 100 provided on one middle frame 10 is closed by the other middle frame 10 to form the above-mentioned communicating hole 11.

[0050] As another method, the above-mentioned connecting groove 100 may also be provided on the mutually conforming surfaces of two adjacent middle frames 10 .

[0051] Each heat sink 2 is provided with a bending portion 21 extending into the connecting hole 11 on the surface in the circumferential direction; the heat sink 2 and the bending portion 21 are made of the same material and can be integrally formed. All the bending portions 21 and the heat sink 2 provided in the circumferential direction of the same heat sink 2 form a lithium battery cell installation groove C1. When installing a lithium battery cell, a heat sink 2 is first installed on a middle frame 10, and at this time, the lithium battery cell can be installed in the lithium battery cell installation groove C1, and then another middle frame 10 with a heat sink 2 is installed. That is, a lithium battery cell installation space K2 is formed between a lithium battery cell installation groove C1 of two adjacent heat sinks 2 and a heat sink 2. And an insulating heat conductive sheet 3 is provided at the bottom of the lithium battery cell installation groove C1. The insulating heat conductive sheet 3 has the function of slightly adjusting the thickness difference and conducting temperature.

[0052] In order to make the position of the lithium battery cell more stable during and after installation, and to improve the heat dissipation performance, the cross section of the bending portion 21 of this embodiment is U-shaped, and the side of the bending portion 21 away from the heat sink 2 extends out of the connecting hole 11 and is in the plane of the corresponding circumferential surface of the frame 1. Secondly, a plurality of connecting holes 11 are respectively provided on each of the three circumferential surfaces of the frame 1 to connect the inside of the frame 1 with the outside, and a bending portion 21 is respectively provided on the three circumferential sides of each heat sink 2. The diameter of the connecting hole 11 in the thickness direction of the middle frame 10 is larger than the wall thickness of the bending portion 21, so that the bending portion 21 can float.

[0053] like Figure 1-Figure 5 As shown, the three faces of the outer circumference of the frame 1 are triangularly distributed, that is, the two opposite faces and the two opposite faces are on the third face of the triangular distribution. At this time, the bending portion 21 passes through the corresponding connecting holes 11 of the three faces, and the three bending portions 21 are also in a triangular distribution state. This structure can also improve the installation efficiency of the lithium battery cell during installation, and can improve the installation stability of the lithium battery cell after installation. Furthermore, two of the bending portions 21 are symmetrically distributed, and the remaining bending portion 21 is connected to the heat sink 2 through a connecting plate 22, and the connecting plate 22 and the heat sink 2 form two notches 23. The formation of the notch 23 can make the lithium battery cell installation space K2 between the two adjacent heat sinks 2 have two more connected penetrations, that is, it can form three penetrations in a triangular distribution with the small channel above, which provides help for the heat dissipation of the lithium battery cell.

[0054] A positioning guide structure is provided between the bending portion 21 and the connecting hole 11 to enable the bending portion 21 to move along the thickness direction of the middle frame 10. The positioning guide structure plays a role in positioning the heat sink 2 and guiding the floating in the thickness direction of the middle frame 10. Specifically, the positioning guide structure of this embodiment includes at least one guide pin 101 provided at the bottom of the connecting groove 100, a guide hole 210 is provided on the bending portion 21, the guide pin 101 is inserted into the corresponding guide hole 210, and the guide pin 101 and the guide hole 210 are clearance-matched. And further, a docking pin 102 is provided at the outer end of the guide pin 101, and in the thickness direction of the two adjacent middle frames 10, the guide pin 101 is provided at the bottom of the connecting groove 100 of one of the middle frames 10, and an alignment hole 103 for inserting the docking pin 102 is provided on the other middle frame 10. The pairing of the docking pin 102 and the alignment hole 103 can ensure the assembly accuracy of the two adjacent middle frames 10.

[0055] Specifically, the bending portion 21 of this embodiment includes a first side portion connected to the heat sink 2, a middle side portion connected to the first side portion, and a second side portion connected to the middle side portion; the length of the first side portion in the thickness direction of the middle frame 10 is shorter than the length of the second side portion in the thickness direction of the middle frame 10. The second side portion is a side portion extending out of the connecting hole 11 and parallel to the corresponding peripheral plane of the frame 1. The three bending portions 21 on a heat sink 2 are respectively sleeved on three sides of a surface of the middle frame 10.

[0056] By using a longer length design, the heat exchange area can be increased to improve the heat dissipation efficiency. The length of the bent portion 21 is shorter than the long side aperture of the connecting hole 11. This solution can ensure that the connecting hole 11 always has a heat dissipation effect.

[0057] By utilizing the floating heat sink 2 which has the function of pre-positioning the lithium battery cells, the assembly efficiency can be improved in the production and assembly process, and the consistency of the installation position of the cells can be ensured.

[0058] By utilizing the floating heat sink 2 , the lithium battery cell installation space K2 can be adjusted in position as the lithium battery cell is charged and discharged, so as to ensure safety in use.

[0059] By utilizing the floating heat sink 2 in combination with the interconnected unenclosed space K1, the connecting hole 11 and the bent portion 21, the heat generated by the internal battery cell can be promptly directed to the outside of the frame 1, thereby extending the service life of the battery cell and preventing explosions caused by excessive internal temperature.

[0060] The assembly method of this embodiment is as follows:

[0061] S1, installing a heat sink 2 on each of the plurality of middle frames 10;

[0062] The specific installation process is: align the guide hole 210 on the bent portion 21 of the heat sink 2 with the guide pin 101 at the bottom of the connecting groove 100, and then make the heat sink 2 in the installed position in the center of the thickness direction of the middle frame 10. The center position can make half of the thickness of the cell in the thickness direction be in one of the two adjacent middle frames 10, and the other half of the thickness of the cell be in the other middle frame 10, and the pins of the cell can be directly led out through the slots on the mating surfaces of the two middle frames 10, which can improve the processing and assembly efficiency.

[0063] S2, the docking pin 102 on one of the two adjacent middle frames 10 is inserted into the alignment hole 103 of the other middle frame 10, so as to realize the alignment and assembly of the two adjacent middle frames 10;

[0064] Repeating the above step S2 can realize the assembly of the battery cell.

[0065] Embodiment 2

[0066] like Figure 6 As shown, the present embodiment provides a lithium battery module, which is an expandable module that can be assembled in series and parallel according to different voltage and capacity requirements. The cells in parallel only need to be stacked in the same manner, including two adaptive adjustment end plates 4, each of which has an adjustable clamping force mechanism 5 on its inner surface, and a recessed groove on the inner surface of each of which, the adjustable clamping force mechanism 5 is in the recessed groove, and the lithium battery cell installation mechanism of the first embodiment is provided between the two adjustable clamping force mechanisms 5 (see Figure 1-Figure 5 The structure is as follows: the adaptive adjustment end plate 4 and the entire middle frame 10 are connected together by a screw rod 6, and nuts are respectively provided at both ends of the screw rod 6; when the lithium battery cell 7 installed in the lithium battery cell installation space K2 is charged and expanded, the two adjacent heat sinks 2 are driven to float in opposite directions in the thickness direction of the middle frame 10; when the lithium battery cell 7 is discharged and contracted, the clamping force adjustable mechanism 5 drives the two adjacent heat sinks 2 to float in opposite directions in the thickness direction of the middle frame 10.

[0067] The design of the two adjustable clamping force mechanisms 5 allows the places with different thicknesses of the battery cells to bear a clamping force, ensuring better adhesion between the battery cells. Good adhesion of the battery cells can make the temperature consistency of the battery cells better, thereby also improving the cycle life of the lithium battery module.

[0068] The adjustable pressing force mechanism 5 can play a role of limiting the limit.

[0069] Taking the current state of the figure as an example, a mounting groove for the output row and the bus bar is designed on the top of the module. The output row and the bus bar are installed according to the series and parallel connection, and finally the protective cover 8 is installed.

[0070] Preferred solutions, such as Figure 7-Figure 10As shown, a plurality of array-distributed pressing force adjustable mechanisms 5 are respectively provided on the inner surface of each adaptive adjustment end plate 4. Specifically, each pressing force adjustable mechanism 5 includes a fixed plate 50 fixed to the inner surface of the adaptive adjustment end plate 4, and a floating plate 51 spaced and parallel to the fixed plate 50. A plurality of springs 52 are provided between the fixed plate 50 and the floating plate 51, that is, one end of the spring 52 acts on the fixed plate 50, and the other end of the spring 52 acts on the floating plate 51. In order to ensure the installation stability of the spring 52, a plurality of springs 52 are installed on the fixed plate 50 or the floating plate 51. 2. The same number of step limit posts 54 is provided on the floating plate 51. For example, the same number of step limit posts 54 as the number of springs 52 are installed on the floating plate 51. A through-post hole for the smallest diameter section of the step limit posts 54 to pass through is provided on the fixed plate 50. A locking nut 55 is threadedly connected to the smallest diameter section of the step limit posts 54. The locking nut 55 can adjust the elastic force of the spring 52 to adjust the distance between the fixed plate 50 and the floating plate 51. The spring 52 is sleeved on the step limit posts. A position sensor 53 for detecting the position of the floating plate 51 is provided on the fixed plate 50 or the adaptive adjustment end plate 4. A position sensing sensor is designed on the adaptive adjustment end plate 4 to detect the expansion deformation of the battery cell. When the deformation expands to a certain extent, the position sensing sensor will send a signal to remind you to stop using it immediately to prevent safety accidents of the lithium battery module.

[0071] After the module is assembled, the adaptive adjustment end plates 4 at both ends of the module will give a clamping force to the battery cells, and the springs in the adjustable clamping force mechanism are in a designed pre-stressed state, and the adjustable clamping force mechanisms in the left and right end plates will give a suitable clamping force to the battery cells in the module. During the charging and discharging process of the module, when the thickness of the battery cells shrinks, the movable plate of the adjustable clamping force mechanism moves inward of the module, which will give a clamping force to the battery cells. When the thickness of the battery cells in the module becomes thicker, the normal expansion of the battery cells will push the movable plate outward, and the pressure clamping force will increase at this time. During the charging and discharging process of the module, the thickness of the battery cells will keep changing, which will cause the springs in the adjustable clamping force mechanism to keep compressing or expanding, which will continue to give pressure to the battery cells to increase the cycle life of the module.

[0072] Multiple adjustable clamping force mechanisms are installed in the end plate. The thickness of the surface of the battery cell is inconsistent, with some places being thick and some places being thin. If a clamping force mechanism is used, the thin parts of the battery cell will not be able to receive the clamping force, and all the force will be pressed on the thick parts of the battery cell. This will cause pressure concentration and may damage the battery cell. Installing multiple adjustable clamping force mechanisms can solve the problem of concentrated clamping force caused by inconsistent battery cell thickness or no clamping force on thin parts of the battery cell.

[0073] A position sensor is designed in the end plate. When the battery cells in the module expand abnormally and uncontrollably, the expansion will press the floating plate in the adjustable clamping force mechanism. When the floating plate moves to a certain extent on both sides of the module, it will trigger the position sensing sensor to work. The sensor sends an electrical signal, requiring the module to be stopped immediately to prevent the continued use of the module from causing safety accidents, thereby serving as an early warning.

[0074] The following is a test of the cycle life of the battery cell by applying different clamping forces, the environment is 25±2℃, and the charge and discharge test is performed. The test results are as follows:

[0075] 1. No clamping force is applied to the battery cell. Three batteries are tested. The test cycle is: #1 is 2052 weeks, #2 is 2120 weeks, and #3 is 2152 weeks.

[0076] 2. The clamping force applied to the battery cell is 1Kg / cm 2 , three batteries were tested, and the test cycle periods were: #1 was 2851 weeks, #2 was 2932 weeks, and #3 was 2863 weeks.

[0077] The clamping force applied to the 3-cell monomer is 5Kg / cm 2 , three batteries were tested, and the test cycle periods were: #1 was 2931 weeks, #2 was 29772 weeks, and #3 was 2835 weeks.

[0078] The clamping force applied to the 4-cell monomer is 10Kg / cm 2 , three batteries were tested, and the test cycle periods were: #1 was 2360 weeks, #2 was 22455 weeks, and #3 was 2412 weeks.

[0079] The cycle life of the battery cell was tested by applying different clamping forces to the battery cell. It was found that the cycle period of applying the clamping force without repeating was the shortest, and the clamping force was 1Kg / cm 2 ~5Kg / cm 2 There is no significant difference in the life cycle, but the cycle is significantly increased compared to not applying clamping force. When the clamping force is greater than 10Kg / cm 2 When the battery is clamped, the cycle period of the battery cell decreases. Through data comparison and analysis, it is found that applying appropriate clamping force to the battery cell can significantly improve the cycle period.

[0080] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A lithium battery cell mounting mechanism, comprising a frame (1) formed by fixing a plurality of middle frames (10) in a thickness direction, characterized in that: The lithium battery cell installation mechanism also includes: A plurality of heat sinks (2) are arranged in parallel and spaced apart from each other; The heat sink (2) is placed in the frame (1) and partially closes the internal space of the frame (1); an unclosed space (K1) is formed inside the heat sink (2) and the frame (1), and all the unclosed spaces (K1) are interconnected; A plurality of communication holes (11) for connecting the interior of the frame (1) with the outside are respectively provided on each of the plurality of surfaces on the outer circumference of the frame (1); A bending portion (21) extending into the connecting hole (11) on the surface is respectively provided on the circumference of each heat sink (2); the bending portion (21) and the heat sink (2) provided on the circumference of the same heat sink (2) form a lithium battery cell installation groove (C1), and a lithium battery cell installation space (K2) is formed between one of the lithium battery cell installation grooves (C1) of two adjacent heat sinks (2) and one of the heat sinks (2); the bending portion (21) has a U-shaped cross section, and a side edge of the bending portion (21) away from the heat sink (2) extends out of the connecting hole (11) and is in the same circumferential plane as the frame (1); A positioning guide structure is provided between the bending portion (21) and the communicating hole (11) to enable the bending portion (21) to move along the thickness direction of the middle frame (10); a communicating groove (100) is provided on a surface of any one of the two adjacent middle frames (10) in the thickness direction, and when the two adjacent middle frames (10) are relatively fixed in the thickness direction, the notch of the communicating groove (100) provided on one of the middle frames (10) is closed by the other middle frame (10) to form the above-mentioned communicating hole (11); the positioning guide structure comprises a groove provided at the bottom of the communicating groove (100) to At least one guide pin (101) is provided, a guide hole (210) is provided on the bending portion (21), the guide pin (101) is inserted into the corresponding guide hole (210), and the guide pin (101) and the guide hole (210) are loosely matched; a docking pin (102) is provided at the outer end of the guide pin (101), and in the thickness direction of two adjacent middle frames (10), the guide pin (101) is provided at the bottom of the connecting groove (100) of one of the middle frames (10), and an alignment hole (103) for inserting the docking pin (102) is provided on the other middle frame (10).

2. The lithium battery cell installation mechanism according to claim 1, characterized in that: A plurality of communication holes (11) for connecting the interior of the frame (1) with the outside are respectively provided on each of the three circumferential surfaces of the frame (1), and the bending portions (21) are respectively provided on the three circumferential sides of each of the heat sinks (2).

3. The lithium battery cell installation mechanism according to claim 2, characterized in that: Two of the bent portions (21) are symmetrically distributed, and the remaining bent portion (21) is connected to the heat sink (2) via a connecting sheet (22), and the connecting sheet (22) and the heat sink (2) form two notches (23).

4. The lithium battery cell installation mechanism according to claim 1, characterized in that: An insulating heat-conducting sheet (3) is provided at the bottom of the lithium battery cell installation groove (C1).

5. A lithium battery module, characterized in that: The lithium battery module comprises two adaptive adjustment end plates (4), each of which is provided with an adjustable pressing force mechanism (5) on its inner surface, and a lithium battery cell installation mechanism according to any one of claims 1 to 4 is provided between the two adjustable pressing force mechanisms (5), and the adaptive adjustment end plates (4) and all the middle frames (10) are connected in series via a screw rod (6); when the lithium battery cell (7) installed in the lithium battery cell installation space (K2) is charged and expanded, it drives two adjacent heat sinks (2) to float in opposite directions in the thickness direction of the middle frame (10); when the lithium battery cell (7) is discharged and contracted, the adjustable pressing force mechanism (5) drives two adjacent heat sinks (2) to float in opposite directions in the thickness direction of the middle frame (10).

6. The lithium battery module according to claim 5, characterized in that: A plurality of adjustable pressing force mechanisms (5) are arranged in an array on the inner surface of each of the adaptive adjustment end plates (4), and the adjustable pressing force mechanisms (5) include a fixed plate (50) fixed to the inner surface of the adaptive adjustment end plate (4), and a floating plate (51) spaced and parallel to the fixed plate (50), a plurality of springs (52) are arranged between the fixed plate (50) and the floating plate (51), and a position sensor (53) for detecting the position of the floating plate (51) is arranged on the fixed plate (50) or the adaptive adjustment end plate (4).

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