Pre-tightening pressure maintaining device for assembling battery module

Abstract

The utility model relates to the technical field of lithium batteries, and provides a pre-tightening pressure-maintaining device for assembling a battery module, which comprises a clamping assembly, a pre-tightening assembly and a stress detection component, the clamping assembly comprises a first end plate and a second end plate, and a clamping position for clamping the battery module is formed between the first end plate and the second end plate; the pre-tightening assembly comprises a plurality of lead screws and pre-tightening nuts matched with the corresponding lead screws, the lead screws penetrate through the first end plate and the second end plate, and the first end plate and the second end plate are pre-tightened through the pre-tightening nuts; the stress detection parts are arranged on the lead screws and are used for detecting the stress of the corresponding lead screws, so that assembling personnel can adjust the pre-tightening force at the two ends of each lead screw to be consistent, the pre-tightening force balance of each lead screw is ensured, and the stability of the battery module is improved; and meanwhile, the pre-tightening nut can be directly adjusted through the adjusting handle, additional auxiliary tools do not need to be used, and therefore the adjusting convenience and the adjusting efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a pre-tightening and pressure-maintaining device for assembling battery modules. Background Art

[0002] The lifespan of lithium batteries significantly impacts their performance and safety, necessitating testing. Existing testing methods primarily rely on measuring volume changes or pressure between battery cells to determine battery lifespan, which is more reliable than voltage monitoring.

[0003] However, the method of using sensors to detect the pressure between lithium battery cells is not sensitive enough to slight pressure changes, resulting in inaccurate detection results. Utility Model Content

[0004] The purpose of the present invention is to provide a pre-tightening and pressure-maintaining device for assembling a battery module, so as to solve the technical problem that the pressure between battery cells cannot be accurately detected, resulting in an inability to accurately judge the battery life.

[0005] The present invention provides a pre-tightening and pressure-maintaining device for battery module assembly, comprising:

[0006] A clamping assembly, the clamping assembly comprising a first end plate and a second end plate, wherein a clamping position for clamping the battery module is formed between the first end plate and the second end plate;

[0007] A pre-tightening assembly, the pre-tightening assembly comprising a plurality of screw rods and pre-tightening nuts matched with corresponding screw rods, the screw rods passing through the first end plate and the second end plate, and pre-tightening the first end plate and the second end plate through the pre-tightening nuts; an adjusting sleeve is provided on the outside of the pre-tightening nut, and an adjusting handle is provided on one side of the adjusting sleeve, and the adjusting handle is used to directly adjust the pre-tightening nut;

[0008] A stress detection component is arranged on each of the screw rods and is used to detect the stress of the corresponding screw rod so that assemblers can adjust the preload forces at both ends of each screw rod to be consistent.

[0009] Optionally, the pre-tightening and pressure-maintaining device for battery module assembly further includes: a pressure detection sensor; the pressure detection sensor is installed between adjacent battery assemblies in the battery module and is used to detect the pressure in the battery module.

[0010] Optionally, positioning grooves are provided on opposite sides of the first end plate and the second end plate, and the positioning grooves are used to adapt to the sides of the battery module.

[0011] Optionally, a buffer gasket is provided in a positioning groove in which the first end plate and the battery module are adapted, and in a positioning groove in which the second end plate and the battery module are adapted.

[0012] Optionally, the stress detection component is a strain gauge, and the strain gauge is attached to the corresponding surface of the screw rod.

[0013] Optionally, the strain gauge on each of the lead screws is located at the center of the lead screw along the length direction, and the strain gauge is located on a side of the lead screw away from the battery module.

[0014] Optionally, the stress detection components are all connected to a stress display device, which displays the stress data corresponding to each stress detection component, so that assemblers can adjust the preload force at both ends of the screw rod corresponding to the stress detection component according to the stress data.

[0015] Optionally, a first handle is provided on a side of the first end plate facing away from the second end plate, and a second handle is provided on a side of the second end plate facing away from the first end plate.

[0016] The embodiments of the present invention have at least the following technical effects:

[0017] The pre-tightening and pressure-maintaining device provided in the embodiment of the present invention applies a certain pre-tightening force to the battery module, thereby facilitating the improvement of the detection sensitivity of the pressure sensor, so that the reading of the pressure sensor can better reflect the expansion of the battery, and is more conducive to monitoring the battery life; at the same time, by adding a strain detection component, the stress of each pre-tightening screw rod is detected to ensure that the pre-tightening force of each screw rod is balanced, which is beneficial to improving the stability of the battery module; at the same time, the pre-tightening nut can be directly adjusted through the adjustment handle without the need for additional auxiliary tools, thereby improving the convenience and efficiency of adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 The present invention provides a pre-tightening and pressure-maintaining device for assembling a battery module (including a battery module) in an embodiment.

[0020] In the figure: 1. Pre-tightening nut; 2. First end plate; 3. Screw; 4. Battery module; 5. Stress detection component; 6. Second end plate. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as those generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0023] Those skilled in the art will understand that, unless otherwise stated, the singular forms "a," "an," "said," and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present utility model refers to the presence of the stated features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0024] Combine Figure 1 As shown, an embodiment of the utility model provides a pre-tightening and pressure-maintaining device for assembling a battery module 4, comprising: a clamping assembly, a pre-tightening assembly and a stress detection component 5; the clamping assembly comprises a first end plate 2 and a second end plate 6, and a clamping position for clamping the battery module 4 is formed between the first end plate 2 and the second end plate 6.

[0025] The pre-tightening assembly includes a plurality of screw rods 3 and pre-tightening nuts 1 matched with the corresponding screw rods 3. The screw rods 3 pass through the first end plate 2 and the second end plate 6, and the first end plate 2 and the second end plate 6 are pre-tightened by the pre-tightening nuts 1. Furthermore, an adjustment sleeve is provided on the outside of the pre-tightening nut 1, and an adjustment handle is provided on one side of the adjustment sleeve. The adjustment handle can be used to directly adjust the pre-tightening nut 1 without the need for additional auxiliary tools, thereby improving the convenience and efficiency of adjustment. A stress detection component 5 is arranged on each of the screw rods 3 to detect the stress of the corresponding screw rod 3, so that the assembler can adjust the pre-tightening force at both ends of each screw rod 3 to be consistent.

[0026] The pre-tightening and pressure-maintaining device provided in the embodiment of the present invention applies a certain pre-tightening force to the battery module 4, thereby facilitating the improvement of the detection sensitivity of the pressure sensor, so that the reading of the pressure sensor can better reflect the expansion of the battery, and is more conducive to monitoring the battery life; at the same time, by adding a strain detection component, the stress of each pre-tightened screw rod 3 is detected to ensure that the pre-tightening force of each screw rod 3 is balanced, which is beneficial to improving the stability of the battery module 4. At the same time, the pre-tightening nut 1 can be directly adjusted through the adjustment handle without the need for additional auxiliary tools, thereby improving the convenience and efficiency of adjustment.

[0027] Optionally, the pre-tightening and pressure-maintaining device for assembling the battery module 4 further includes: a pressure detection sensor; the pressure detection sensor is installed between adjacent battery assemblies in the battery module 4 and is used to detect the pressure in the battery module 4.

[0028] The pressure detection sensor is basically the same size as the battery pack and is relatively thin. It is sandwiched between two battery pack modules. Since the size of the pressure detection sensor is close to the size of the battery module 4, it is beneficial to increase the accuracy of pressure detection. The pressure detection sensor is a multi-point sensor, so it can detect locations with higher pressure.

[0029] Optionally, positioning grooves are provided on the opposite sides of the first end plate 2 and the second end plate 6, and the positioning grooves are used to adapt to the sides of the battery module 4, so as to facilitate rapid assembly of the end plate and the battery module 4, thereby improving the assembly efficiency of the battery module 4.

[0030] Optionally, buffer gaskets are provided in the positioning grooves where the first end plate 2 and the battery module 4 are adapted, and in the positioning grooves where the second end plate 6 and the battery module 4 are adapted. The buffer gaskets are helpful in alleviating the contact stress between the end plate and the battery module 4, thereby improving the safety of the battery.

[0031] Optionally, the stress detection component 5 is a strain gauge, which is attached to the surface of the corresponding screw rod 3 by an adhesive or an adhesive tape, and is easy to install.

[0032] Optionally, the strain gauge on each of the screw rods 3 is located at the center of the screw rod 3 along the length direction, which is conducive to improving the accuracy of the strain gauge reading, and the strain gauges are located on the side of the screw rod 3 away from the battery module 4, which is convenient for operators to maintain and install.

[0033] Optionally, the stress detection components 5 are all connected to the stress display device, and the stress display device is electrically connected to the stress detection components 5 on each screw rod 3 through a signal line, so that the stress data corresponding to each stress detection component 5 is displayed by the stress display device. The stress data may include positive and negative signs, and different signs correspond to different stress directions, so that the assembler can adjust the preload force at both ends of the screw rod 3 corresponding to the stress detection component 5 according to the stress data, thereby effectively improving the convenience of stress adjustment through intuitive data, thereby improving assembly efficiency.

[0034] Optionally, a first handle is provided on the side of the first end plate 2 facing away from the second end plate 6, and a second handle is provided on the side of the second end plate 6 facing away from the first end plate 2. By providing handles on the outer sides of the first end plate 2 and the second end plate 6 respectively, it is convenient for assemblers to apply pre-tightening force to the battery module 4 and facilitate adjustment.

[0035] Those skilled in the art will appreciate that the steps, measures, and solutions in the various operations, methods, and processes discussed in this utility model may be interchanged, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this utility model may also be interchanged, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in the prior art that are similar to those disclosed in this utility model may also be interchanged, modified, rearranged, decomposed, combined, or deleted.

[0036] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0038] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0039] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0040] It should be understood that although the steps in the flowcharts of the accompanying drawings are shown in sequence as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some of the steps in the flowcharts of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pre-tightening and pressure-maintaining device for battery module assembly, characterized in that: include: A clamping assembly, the clamping assembly comprising a first end plate and a second end plate, wherein a clamping position for clamping the battery module is formed between the first end plate and the second end plate; A pre-tightening assembly, the pre-tightening assembly comprising a plurality of screw rods and pre-tightening nuts matched with corresponding screw rods, the screw rods passing through the first end plate and the second end plate, and pre-tightening the first end plate and the second end plate through the pre-tightening nuts; an adjusting sleeve is provided on the outside of the pre-tightening nut, and an adjusting handle is provided on one side of the adjusting sleeve, and the adjusting handle is used to directly adjust the pre-tightening nut; A stress detection component is arranged on each of the screw rods and is used to detect the stress of the corresponding screw rod so that assemblers can adjust the preload forces at both ends of each screw rod to be consistent.

2. The pre-tightening and pressure-maintaining device for battery module assembly according to claim 1, characterized in that: Also includes: Pressure detection sensor; the pressure detection sensor is installed between adjacent battery components in the battery module and is used to detect the pressure in the battery module.

3. The pre-tightening and pressure-maintaining device for battery module assembly according to claim 1, characterized in that: The opposite sides of the first end plate and the second end plate are both provided with positioning grooves, and the positioning grooves are used to adapt to the sides of the battery module.

4. The pre-tightening and pressure-maintaining device for battery module assembly according to claim 3, characterized in that: Buffer gaskets are provided in the positioning grooves where the first end plate and the battery module are adapted, and in the positioning grooves where the second end plate and the battery module are adapted.

5. The pre-tightening and pressure-maintaining device for battery module assembly according to claim 1, characterized in that: The stress detection component is a strain gauge, and the strain gauge is attached to the corresponding surface of the screw rod.

6. The pre-tightening and pressure-maintaining device for battery module assembly according to claim 5, characterized in that: The strain gauge on each of the screw rods is located at the center of the screw rod along the length direction, and the strain gauge is located on the side of the screw rod away from the battery module.

7. The pre-tightening and pressure-maintaining device for battery module assembly according to claim 6, characterized in that: The stress detection components are all connected to a stress display device, which displays the stress data corresponding to each stress detection component so that assemblers can adjust the preload force at both ends of the screw rod corresponding to the stress detection component according to the stress data.

8. The pre-tightening and pressure-maintaining device for battery module assembly according to claim 1, characterized in that: A first handle is provided on a side of the first end plate facing away from the second end plate, and a second handle is provided on a side of the second end plate facing away from the first end plate.

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