Battery module end gap adjustment device, battery module and battery pack

Abstract

This utility model provides a battery module end gap adjustment device, belonging to the field of battery packs. The device includes a connecting shaft, an extrusion plate, and a base plate. A first connecting rod and a second connecting rod are respectively provided at both ends of the connecting shaft. One end of the first connecting rod is fixedly abutted against the extrusion plate, and the other end is movably abutted against the base plate. One end of the second connecting rod is fixedly abutted against the base plate, and the other end is movably abutted against the extrusion plate. The connecting shaft is driven to move, causing the extrusion plate to move closer to or away from the base plate. The device also provides a battery module and a battery pack. It can adjust the end gap of the battery module, solving the problem that the gap between the battery module end plate and the crossbeam far exceeds the design gap and cannot be adjusted.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, and in particular to a battery module end gap adjustment device, a battery module, and a battery pack. Background Technology

[0002] With the widespread adoption of new energy vehicles and the introduction of national subsidies, vehicle manufacturers are placing higher demands on the lifespan of power batteries. Module gaps consistently impact cell cycle life. Currently, battery modules use fixed end plates at both ends. When short-blade cell modules are assembled and packaged, the gap between the end plate and the crossbeam is often significantly larger than the ideal design gap due to limitations in the packaging equipment's precision. This leads to accelerated capacity decay of the cells at the end plate and crossbeam during cycling. Furthermore, the cell gaps within the battery module gradually increase with charging and discharging time and cycles. Since the gap between the end plate and the crossbeam cannot be adjusted to accommodate the expansion forces during cycling, the effective capacity of the battery module gradually decreases as the cell gaps widen, making it increasingly less durable.

[0003] To address the issue of accelerated capacity retention degradation of cells at the end plates and crossbeams due to gaps exceeding design limits, and to slow down the widening of cell gaps in battery modules, the current approach involves reducing the gap between the battery module and the battery pack crossbeam while filling this gap with filler material. However, this method has several drawbacks: reducing the gap between the battery module and the battery pack crossbeam reduces the workspace for module assembly, increases operational difficulty, and lowers production efficiency; filling the gap relies entirely on manual labor, which is difficult and makes it impossible to effectively inspect the filling quality; and the filler material can only slow down the widening of cell gaps during actual use, gradually losing its effectiveness due to limitations in the quantity of filler and material aging. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to solve the problem that the gap between the battery module end plate and the crossbeam is far beyond the design gap and cannot be adjusted.

[0005] This utility model solves the above-mentioned technical problems through the following technical solution: a battery module end gap adjustment device, the device includes a connecting shaft, an extrusion plate, and a base plate. The two ends of the connecting shaft are respectively provided with a first connecting rod and a second connecting rod that are cross-connected. One end of the first connecting rod is fixedly abutted against the extrusion plate, and the other end of the first connecting rod is movably abutted against the base plate. One end of the second connecting rod is fixedly abutted against the base plate, and the other end of the second connecting rod is movably abutted against the extrusion plate. The connecting shaft is driven to move, causing the extrusion plate to move closer to or away from the base plate.

[0006] Beneficial effects: This utility model has a first connecting rod and a second connecting rod that are cross-connected at both ends of the connecting rod shaft. When the connecting rod shaft is driven to move, the included angle between the first connecting rod and the second connecting rod changes, which causes the extrusion plate to move closer to or away from the base plate, thereby adjusting the gap between the extrusion plate and the base plate.

[0007] Preferably, there are two connecting rod shafts, which move towards or away from each other.

[0008] Beneficial effects: When the two connecting rod shafts move towards each other, the first connecting rod is fixedly abutting one end of the extrusion plate, and the second connecting rod is fixedly abutting one end of the base plate, both serving as fixed fulcrums. The two first connecting rods on the same side of the connecting rod shafts, whose ends are movably abutting the other end of the base plate, also move towards each other. The angle between the first and second connecting rods and the base plate gradually decreases, and the angles between the first and second connecting rods and the base plate tend to be perpendicular. The two second connecting rods on the same side of the connecting rod shafts, whose ends are movably abutting the other end of the extrusion plate, push the extrusion plate away from the base plate, thus reducing the gap between the extrusion plate and the base plate. Large; When the two connecting rod shafts move in opposite directions, the first connecting rod fixedly abuts against one end of the extrusion plate and the second connecting rod fixedly abuts against one end of the base plate, both of which are fixed fulcrums. The two first connecting rods on the same side of the connecting rod shaft move in opposite directions, abutting against the other end of the base plate. The angle between the first connecting rod and the second connecting rod towards the base plate gradually increases, and the angle between the first connecting rod and the second connecting rod and the base plate tends to be parallel. The two second connecting rods on the same side of the connecting rod shaft move in opposite directions, abutting against the other end of the extrusion plate, carrying the extrusion plate towards the direction closer to the base plate. The gap between the extrusion plate and the base plate becomes smaller.

[0009] Preferably, the device further includes a lead screw, with two connecting rod shafts located on the first threaded section and the second threaded section of the lead screw, respectively, and the rotation directions of the first threaded section and the second threaded section are opposite.

[0010] Beneficial effects: The first and second threaded sections of this utility model rotate in opposite directions, which enables the two connecting rod shafts on the first and second threaded sections to move towards or away from each other when the lead screw is working.

[0011] Preferably, one end of the two first connecting rods on the same side of the connecting rod shaft is fixedly connected by a first wheel shaft, one end of the two second connecting rods on the same side of the connecting rod shaft is fixedly connected by a second wheel shaft, and the other ends of the first connecting rods and the second connecting rods are respectively connected to a third wheel shaft. Extrusion wheels are respectively provided at both ends of the first wheel shaft, the second wheel shaft, and the third wheel shaft. The ends of the first wheel shaft and the second wheel shaft are respectively fixed to the extrusion plate and the base plate by a first connecting block.

[0012] Preferably, one end of the lead screw is connected to the output end of the motor via a coupling, and the other end of the lead screw is connected to the balance block via a bearing; bases are respectively provided at both ends of the base plate, the motor is connected to the base at one end of the base plate via a second connecting block, and the balance block is connected to the base at the other end of the base plate.

[0013] Beneficial effects: The motor transmits power to the lead screw through the coupling, and the bearings and balance weights can prevent the end of the lead screw from vibrating during operation, thus avoiding a reduction in the lifespan of the lead screw.

[0014] Preferably, the base is provided with a slide rail, and the second connecting block and the balance block are respectively provided with sliders, the sliders are located on the slide rail, and the two ends of the slide rail are respectively provided with stops.

[0015] Beneficial effects: By setting up a slider and a slide rail, this utility model can enable the motor to follow the movement during operation, and also serves to fix the relative position of the motor; the stop block is locked at both ends of the slide rail, which can prevent the slider from falling off the slide rail during assembly and debugging.

[0016] Preferably, the device further includes a battery management system and a controller. A pressure sensor is provided on the extrusion plate. The pressure sensor is connected to the input terminal of the controller. The output terminal of the controller is connected to the input terminal of the battery management system. The motor and the switching transistor are connected in series across the power port of the battery management system.

[0017] Beneficial effects: By connecting the pressure sensor to the controller, a target value for the expansion force can be set in the controller. The pressure sensor will input the current expansion force collected by the sensor into the controller. The controller compares the current expansion force value with the target value. When the current expansion force value is greater than the target value, it indicates that the cell expansion force has increased. At this time, the controller outputs a control signal to the battery management system. The battery management system outputs a signal to the switching transistor according to the control signal. The switching transistor is turned on, the motor starts, and the lead screw works. The lead screw drives the two translation blocks to move in opposite directions, so that the gap between the extrusion plate and the base plate is reduced, thereby automatically reducing the gap between the outermost cell of the cell module and the crossbeam.

[0018] Preferably, the device further includes a zeroing sensor and a zeroing plate. The zeroing sensor is fixedly mounted on the base plate by a fixing plate, and the zeroing plate is fixedly mounted on the translation block on the lead screw.

[0019] Beneficial effect: The initial position of the translation block can be controlled by the zeroing sensor.

[0020] This utility model also provides a battery module, including the battery module end gap adjustment device and multiple battery cells. The multiple battery cells are connected in series and / or in parallel and stacked in one direction. The two ends of the battery cell stack are clamped by the battery module end gap adjustment device.

[0021] This utility model also provides a battery pack, including a battery box, the battery box having at least two battery compartments, in which battery modules are placed, the battery modules being the aforementioned battery modules, a base plate being fixedly installed on the crossbeam of the battery box, an extrusion plate being fixedly installed on the outer cell shell of the cell module, and a pressure sensor being located between the extrusion plate and the outer cell shell.

[0022] The advantages of this invention are as follows: The battery module end gap adjustment device is installed between the battery module and the crossbeam, enabling adjustment of the end gap of the battery module. This solves the problem of the gap between the battery module end plate and the crossbeam exceeding the design gap and being impossible to adjust. With this device, strict control of the gap between the battery module and the crossbeam is unnecessary during battery pack production. After the battery module is placed in the box, the device adjusts the end gap, thereby regulating the internal stress of the battery module. This significantly improves the production efficiency of module placement and eliminates the need for additional filling operations, effectively ensuring product quality. Throughout the entire lifecycle of the battery pack, this device can adjust the internal stress of the battery module in real time, thereby improving the thermal cycling efficiency and service life of the battery pack. Attached Figure Description

[0023] Figure 1 A perspective view of the battery module end gap adjustment device provided in Embodiment 1 of this utility model;

[0024] Figure 2 A perspective view of the battery module end gap adjustment device provided in Embodiment 1 of this utility model;

[0025] Figure 3 This is a front view of the battery module end gap adjustment device provided in Embodiment 1 of this utility model;

[0026] Figure 4 This is a top view of the battery module end gap adjustment device provided in Embodiment 1 of this utility model;

[0027] Figure 5 This is a bottom view of the battery module end gap adjustment device provided in Embodiment 1 of this utility model;

[0028] Figure 6 This is a left view of the battery module end gap adjustment device provided in Embodiment 1 of this utility model;

[0029] Figure 7 This is a right view of the battery module end gap adjustment device provided in Embodiment 1 of this utility model;

[0030] Figure 8 for Figure 4 Half-section view along the AA direction;

[0031] Figure 9 A schematic diagram showing the positions of the first connecting rod and the second connecting rod in the battery module end gap adjustment device provided in Embodiment 1 of this utility model;

[0032] Figure 10 This is a schematic diagram showing the position of the translation block in the battery module end gap adjustment device provided in Embodiment 1 of this utility model;

[0033] Figure 11 A schematic diagram showing the positions of the zeroing sensor and zeroing plate in the battery module end gap adjustment device provided in Embodiment 1 of this utility model;

[0034] Figure 12 A schematic diagram illustrating the working principle of the battery module end gap adjustment device provided in Embodiment 1 of this utility model;

[0035] Figure 13 This is a schematic diagram of the electrical control principle of the battery module end gap adjustment device provided in Embodiment 1 of this utility model;

[0036] Figure 14 This is a schematic diagram of the battery pack provided in Embodiment 3 of this utility model;

[0037] In the diagram: 10 Lead screw, 11 First threaded section, 12 Second threaded section, 13 Bearing, 14 Balance block, 20 Translation block, 30 Connecting rod shaft, 41 First connecting rod, 42 Second connecting rod, 43 First wheel shaft, 44 Second wheel shaft, 45 Third wheel shaft, 46 Extrusion wheel, 47 First connecting block, 50 Extrusion plate, 60 Base plate, 61 Base, 62 Third connecting block, 70 Pressure sensor, 71 Zeroing sensor, 72 Zeroing plate, 81 Motor, 82 Coupling, 83 Second connecting block, 91 Slide rail, 92 Slider, 93 Stop block, 100 Battery box, 101 Battery compartment, 102 Crossbeam. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model are described clearly and completely below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0039] Example 1

[0040] like Figure 1-7As shown, this embodiment provides a battery module end gap adjustment device, including a connecting rod shaft 30, an extrusion plate 50, and a base plate 60. The two ends of the connecting rod shaft 30 are respectively provided with a first connecting rod 41 and a second connecting rod 42 that are cross-connected. One end of the first connecting rod 41 is fixedly abutted against the extrusion plate 50, and the other end of the first connecting rod 41 is movably abutted against the base plate 60. One end of the second connecting rod 42 is fixedly abutted against the base plate 60, and the other end of the second connecting rod 42 is movably abutted against the extrusion plate 50. The connecting rod shaft 30 is driven to move, causing the extrusion plate 50 to move closer to or away from the base plate 60.

[0041] This utility model provides a first connecting rod 41 and a second connecting rod 42 that are cross-connected at both ends of the connecting rod shaft 30. When the connecting rod shaft 30 is driven to move, the included angle between the first connecting rod 41 and the second connecting rod 42 changes, causing the extrusion plate 50 to move closer to or further away from the base plate 60, thereby adjusting the gap between the extrusion plate 50 and the base plate 60.

[0042] In the battery module end gap adjustment device of this utility model, the connecting rod shaft 30 can be set as one, or multiple can be set according to the size of the battery module. In the case of multiple, two are usually set. The specific structures of setting one and two connecting rod shafts 30 are described below:

[0043] When there is only one connecting rod shaft 30, the connecting rod shaft 30 can be fixedly installed on the lead screw 10 through the translation block 20. When the lead screw 10 works, it drives the connecting rod shaft 30 to move to the left or right, and the angle between the first connecting rod 41 and the second connecting rod 42 toward the base plate 60 changes, thereby adjusting the gap between the extrusion plate 50 and the base plate 60.

[0044] When there are two connecting rod shafts 30, the connecting rod shafts 30 are fixedly mounted on the lead screw 10 via the translation block 20. The two connecting rod shafts 30 move towards or away from each other. At this time, the first connecting rod 41 is fixedly abutting one end of the extrusion plate 50, and the second connecting rod 42 is fixedly abutting one end of the base plate 60. Both ends are fixed fulcrums. The other ends of the two first connecting rods 41 on the same side of the connecting rod shaft 30 that are movably abutting the base plate 60 also move towards each other. The angle between the first connecting rod 41 and the second connecting rod 42 and the base plate 60 gradually decreases, and the angle between the first connecting rod 41 and the second connecting rod 42 and the base plate 60 tends to be perpendicular. The other ends of the two second connecting rods 42 on the same side of the connecting rod shaft 30 that are movably abutting the extrusion plate 50 push the extrusion plate 50 to move away from the base plate 60. The extrusion plate 50 and the base plate... The gap between 60 increases; when the two translation blocks 20 move in opposite directions, the translation blocks 20 drive the two connecting rod shafts 30 to move in opposite directions. At this time, the first connecting rod 41 fixedly abuts against one end of the extrusion plate 50 and the second connecting rod 42 fixedly abuts against one end of the base plate 60 are both fixed fulcrums. The other ends of the two first connecting rods 41 on the same side of the connecting rod shaft 30 that abut against the base plate 60 also move in opposite directions. The angle between the first connecting rod 41 and the second connecting rod 42 toward the base plate 60 gradually increases. The angle between the first connecting rod 41, the second connecting rod 42 and the base plate 60 tends to be parallel. The other ends of the two second connecting rods 42 on the same side of the connecting rod shaft 30 that abut against the extrusion plate 50 move the extrusion plate 50 toward the direction closer to the base plate 60. The gap between the extrusion plate 50 and the base plate 60 decreases.

[0045] By installing the gap adjustment device of this utility model at the end of the battery module, the gap at the end of the battery module can be adjusted.

[0046] See Figure 8 and Figure 9 The device also includes a lead screw 10, with two connecting rod shafts 30 located on the first threaded section 11 and the second threaded section 12 of the lead screw 10, respectively. The rotation directions of the first threaded section 11 and the second threaded section 12 are opposite. The lead screw 10 can be a left-right rotating ball screw. Flanges are installed on the first threaded section 11 and the second threaded section 12, respectively. A translation block 20 is fixedly installed on the flange by a bolt assembly. The connecting rod shaft 30 passes through the translation block 20 and is perpendicular to the lead screw 10. The opposite rotation directions of the first threaded section 11 and the second threaded section 12 mean that when the rotation direction of the first threaded section 11 is left-handed, the rotation direction of the second threaded section 12 is right-handed, and vice versa. This enables the lead screw 10 to work, driving the two translation blocks 20 to move towards or away from each other, thereby driving the two connecting rod shafts 30 to move towards or away from each other, and thus driving the extrusion plate 50 to move closer to or away from the base plate 60.

[0047] See Figure 9One end of each of the two first connecting rods 41 on the same side of the connecting rod shaft 30 is fixedly connected by a first wheel shaft 43, and one end of each of the two second connecting rods 42 on the same side of the connecting rod shaft 30 is fixedly connected by a second wheel shaft 44. The other ends of the first connecting rods 41 and the second connecting rods 42 are respectively connected to a third wheel shaft 45. Extrusion wheels 46 are respectively installed at both ends of the first wheel shaft 43, the second wheel shaft 44, and the third wheel shaft 45. The ends of the first wheel shaft 43 and the second wheel shaft 44 are respectively fixed to the extrusion plate 50 and the base plate 60 by first connecting blocks 47. To achieve stable movement of the extrusion wheels 46 along the base plate 60 and the extrusion plate 50, grooves can be opened on the base plate 60 and the extrusion plate 50 respectively, allowing the extrusion wheels 46 to move within the grooves. Furthermore, limiting blocks can be installed at both ends of the grooves to limit the movement of the extrusion wheels 60.

[0048] See Figure 9 and Figure 10 One end of the lead screw 10 is connected to the output end of the motor 81 via a coupling 82, and the other end of the lead screw 10 is connected to the balance block 14 via a bearing 13. One end of the lead screw 10 is locked to the output shaft of the motor 81 via the coupling 82, and the other end of the lead screw 10 is connected to the balance block 14 via the bearing 13. The motor 81 can be a servo motor. The motor 81 transmits power to the lead screw 10 via the coupling 82. The bearing 13 and the balance block 14 can prevent the end of the lead screw 10 from vibrating during operation, so as not to reduce the service life of the lead screw 10.

[0049] See Figure 4 The base plate 60 has bases 61 at both ends. The motor 81 is connected to one base 61 at one end of the base plate 60 via a second connecting block 83, and the balance block 14 is connected to the base 61 at the other end of the base plate 60. (See also...) Figure 11 The base 61 can be fixedly installed on the base plate 60 by the third connecting block 62. Specifically, the third connecting block 62 can be fixedly installed on the base plate 60 by using a bolt assembly, and the base 61 can be fixedly installed on the third connecting block 62 by using a bolt assembly.

[0050] See Figure 3 , Figure 6 and Figure 7A slide rail 91 is provided on the base 61, and sliders 92 are respectively provided on the second connecting block 83 and the balance block 14. The sliders 92 are located on the slide rail 91, and stops 93 are respectively provided at both ends of the slide rail 91. The slide rail 91 can be fixedly installed on the base 61 by bolt assembly, and multiple sliders 92 can be fixedly installed on the second connecting block 83 and the balance block 14 by bolt assembly. In this embodiment, two sliders 92 are fixedly installed on the second connecting block 83 and the balance block 14 respectively. By setting the sliders 92 and the slide rail 91, the motor can be made to follow the movement during the operation, and it also serves to fix the relative position of the motor. The stops 93 are locked at both ends of the slide rail 91 to prevent the sliders 92 from falling off the slide rail during assembly and debugging.

[0051] A pressure sensor 70 is installed on the extrusion plate 50. The pressure sensor 70 is located between the extrusion plate 50 and the outermost cell of the battery module. It senses changes in the expansion force of the cells within the battery module and determines how to adjust the end gap of the battery module based on these changes. For example, if the normal value of the cell expansion force is set to 200N, and the current expansion force is greater than 200N, it indicates that the cell expansion force has increased. The lead screw 10 then drives two translation blocks 20 to move in opposite directions, reducing the gap between the extrusion plate 50 and the base plate 60. This reduces the gap between the outermost cell of the battery module and the crossbeam, releasing some of the expansion force and preventing accelerated capacity retention degradation of the cells at the end plates and crossbeams during cycling. The pressure sensor 70 can be a thin-film pressure sensor, and at least one sensor is required. In practice, two sensors can be used for easier wiring harness arrangement.

[0052] See Figure 13The device also includes a battery management system and a controller. The battery management system is model FBMSG1.7, and the controller is an expansion force acquisition controller, model EH-2. The pressure sensor 70 is connected to the input terminal of the controller, and the output terminal of the controller is connected to the input terminal of the battery management system. The motor 81 and the switching transistor are connected in series across the power supply port of the battery management system. Specifically, taking motor M1 as an example, one end of motor M1 is connected to the positive terminal 12V+ of the power supply of the battery management system, and the other end of motor M1 is connected to the drain of the switching transistor Q1. The source of the switching transistor Q1 is connected to the negative terminal 12V- of the power supply. By connecting the pressure sensor 70 to the controller, a target value for the expansion force can be set in the controller. The pressure sensor 70 will input the current expansion force collected by the sensor into the controller. The controller compares the current expansion force with the target value. When the current expansion force is greater than the target value, it indicates that the cell expansion force has increased. At this time, the controller outputs a control signal to the battery management system. The battery management system outputs a signal to the switching transistor according to the control signal. The switching transistor is turned on, the motor 81 starts, and drives the lead screw 10 to work. The lead screw 10 drives the two translation blocks 20 to move in opposite directions, so that the gap between the extrusion plate 50 and the bottom plate 60 is reduced. This can automatically reduce the gap between the outermost cell of the cell module and the crossbeam, release a certain amount of expansion force, and thus avoid the accelerated decay of the capacity retention rate of the cells at the end plate and crossbeam during the cycle.

[0053] It should be noted that the controller's control method is existing technology. The Battery Management System (BMS) is an electronic device in a power battery system that intelligently manages and maintains each battery cell, prevents overcharging and over-discharging, extends battery life, monitors battery status, executes electrical performance strategies within the battery pack, controls electrical components, and facilitates information exchange. The Battery Management System determines whether to output a signal to turn on the switching transistor based on the controller's output signal, which can be implemented using simple logic circuits.

[0054] See Figure 11 The device also includes a zeroing sensor 71 and a zeroing plate 72. The zeroing sensor 71 is fixedly mounted on the base plate 60 via a fixing plate 63, and the zeroing plate 72 is fixedly mounted on the translation block 20. The initial position of the translation block 20 can be controlled by sensing the zeroing sensor 71. The zeroing sensor 71 can be an Omron 674 fork-shaped sensor.

[0055] Working Principle: In actual operation, the battery module end gap adjustment device of this utility model is installed between the battery module and the crossbeam. The base plate 60 is fixedly installed on the crossbeam, and the extrusion plate 50 is bonded to the shell of the outermost cell of the battery module. The pressure sensor 70 senses the change in the expansion force of the cell in the cell module in real time. When the expansion force increases, in order to release a certain amount of expansion force, the lead screw 10 drives the two translation blocks 20 to move in opposite directions, so that the gap between the extrusion plate 50 and the base plate 60 decreases, thereby reducing the gap between the outermost cell of the cell module and the crossbeam. If the expansion force decreases, in order to increase the support force on the battery module, see [reference needed]. Figure 12 At this time, the lead screw 10 drives the two translation blocks 20 to move in opposite directions, which increases the gap between the extrusion plate 50 and the base plate 60, thereby increasing the gap between the outermost cell of the cell module and the crossbeam. The battery module end gap adjustment device of this utility model is particularly suitable for adjusting the end gap of the battery module of short blade cell LCTP.

[0056] By adopting the battery module end gap adjustment device of this utility model, the battery pack production process does not require strict control of the gap between the battery module and the crossbeam. After the battery module is placed in the box, the device adjusts the end gap of the battery module, thereby adjusting the internal stress of the battery module. This can greatly improve the production efficiency of module placement in the box, and eliminate the need for filling operations. Product quality can be effectively guaranteed. Throughout the entire life cycle of the battery pack, the device can adjust the internal stress of the battery module in real time, thereby improving the thermal cycling efficiency and service life of the battery pack.

[0057] Example 2

[0058] This embodiment provides a battery module, including the battery module end gap adjustment device of embodiment 1 and multiple battery cells. The multiple battery cells are connected in series and / or in parallel and stacked in one direction. The two ends of the battery cell stack are clamped by the battery module end gap adjustment device.

[0059] Example 3

[0060] See Figure 14 This embodiment provides a battery pack, including a battery housing 100, which has at least two battery compartments 101. A battery module is placed in the battery compartment 101, and the battery module adopts the battery module of embodiment 2.

[0061] The base plate 60 is fixedly installed on the crossbeam 102 of the battery box 100, the extrusion plate 50 is fixedly installed on the outer cell shell of the cell module, and the pressure sensor 70 is located between the extrusion plate 50 and the outer cell shell.

[0062] Figure 14The battery pack is equipped with four battery module end gap adjustment devices as described in Embodiment 1, see [link to embodiment]. Figure 13 Therefore, there are four motors M1, M2, M3, and M4. Pressure sensors P1, P2, P3, and P4 are respectively installed on the extrusion plates of the four battery module end gap adjustment devices. Pressure sensors P1, P2, P3, and P4 are respectively connected to the signal input ports of the controller. Motor M1 and switch Q1 are connected in series in the power supply port one of the battery management system. Motor M2 and switch Q2 are connected in series in the power supply port two of the battery management system. Motor M3 and switch Q3 are connected in series in the power supply port three of the battery management system. Motor M4 and switch Q4 are connected in series in the power supply port four of the battery management system.

[0063] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery module end gap adjustment device, characterized by: The device includes a connecting rod shaft, an extrusion plate, and a base plate. The two ends of the connecting rod shaft are respectively provided with a first connecting rod and a second connecting rod that are cross-connected. One end of the first connecting rod is fixedly abutted against the extrusion plate, and the other end of the first connecting rod is movably abutted against the base plate. One end of the second connecting rod is fixedly abutted against the base plate, and the other end of the second connecting rod is movably abutted against the extrusion plate. The connecting rod shaft is driven to move, causing the extrusion plate to move closer to or away from the base plate.

2. The battery module end gap adjustment device of claim 1, wherein: There are two connecting rod shafts, which can move towards or away from each other.

3. The battery module end gap adjustment device of claim 2, wherein: The device also includes a lead screw, with two connecting rod shafts located on the first and second threaded sections of the lead screw, respectively, and the first and second threaded sections rotate in opposite directions.

4. The battery module end gap adjustment device of claim 2, wherein: One end of the two first connecting rods on the same side of the connecting rod shaft is fixedly connected by the first wheel shaft, and one end of the two second connecting rods on the same side of the connecting rod shaft is fixedly connected by the second wheel shaft. The other ends of the first connecting rod and the second connecting rod are respectively connected to the third wheel shaft. The two ends of the first wheel shaft, the second wheel shaft and the third wheel shaft are respectively provided with extrusion wheels. The ends of the first wheel shaft and the second wheel shaft are respectively fixed to the extrusion plate and the base plate by the first connecting block.

5. The battery module end gap adjustment device according to claim 1, characterized in that: One end of the lead screw is connected to the output end of the motor via a coupling, and the other end of the lead screw is connected to the balance block via a bearing; bases are provided at both ends of the base plate, and the motor is connected to the base at one end of the base plate via a second connecting block, while the balance block is connected to the base at the other end of the base plate.

6. The battery module end gap adjustment device of claim 5, wherein: The base is equipped with a slide rail, and the second connecting block and the balance block are equipped with sliders. The sliders are located on the slide rail, and the two ends of the slide rail are equipped with stops.

7. The battery module end gap adjustment device of claim 1, wherein: The device also includes a battery management system and a controller. A pressure sensor is installed on the extrusion plate. The pressure sensor is connected to the input terminal of the controller. The output terminal of the controller is connected to the input terminal of the battery management system. The motor and the switching transistor are connected in series across the power port of the battery management system.

8. The battery module end gap adjustment device of claim 1, wherein: The device also includes a zeroing sensor and a zeroing plate. The zeroing sensor is fixedly mounted on the base plate by a fixing plate, and the zeroing plate is fixedly mounted on the translation block on the lead screw.

9. A battery module, characterized by: The battery module includes the battery module end gap adjustment device as described in any one of claims 1-8 and a plurality of battery cells, wherein the plurality of battery cells are connected in series and / or in parallel and stacked in one direction, and the two ends of the battery cell stack are clamped by the battery module end gap adjustment device.

10. A battery pack comprising a battery case having at least two battery compartments in which battery modules are placed, characterized by, The battery module adopts the battery module of claim 9, with the base plate fixedly installed on the crossbeam of the battery box, the extrusion plate fixedly installed on the outer cell shell in the cell module, and the pressure sensor located between the extrusion plate and the outer cell shell.

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