Battery module heat insulation device and battery module

Abstract

The utility model discloses a battery module heat insulation device and a battery module, which are applied to the technical field of battery heat insulation, the battery module heat insulation device comprises: a heat insulation foam arranged between an insulation sheet and an end plate; the buffer limiting piece is located on the periphery of the heat insulation foam, the two sides of the buffer limiting piece are attached to the insulation piece and the end plate respectively, when the insulation piece is close to the end plate, the buffer limiting piece can be compressed, and the compression stress of the buffer limiting piece is larger than that of the heat insulation foam. According to the battery module heat insulation device provided by the utility model, the buffer limiting piece is additionally arranged between the insulation sheet and the end plate, and the compression stress of the buffer limiting piece is greater than that of the heat insulation foam, so that when the battery monomers are expanded and deformed and the heat insulation foam is compressed, the buffer limiting piece is additionally arranged; and the buffer limiting piece can bear a certain degree of compression deformation and absorb the deformation of the battery cell in the battery monomer, so that the heat insulation foam is prevented from being extruded, and the influence on the heat insulation effect of the heat insulation foam is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery heat insulation, in particular to a battery module heat insulation device and a battery module. Background Technique

[0002] At present, when several ion batteries form a battery module, end plates are arranged at both ends of the battery module. The end plates are usually made of metal and provide a framework for the battery module, playing a role in fixing and protecting the battery. The battery module often adopts liquid cooling for thermal management in the system. Usually, a liquid cooling plate is arranged at the bottom of the battery module to cool or heat the battery through the liquid cooling plate at the bottom. Moreover, insulating sheets are arranged between the batteries at both ends of the battery module and the end plates to play a role in insulation and protecting the battery cells.

[0003] However, since the battery cells at both ends of the battery module exchange heat not only through the bottom of the battery cells and the liquid cooling plate, but also through the side surfaces with the end plates. The heat exchange on the side surfaces increases the heat dissipation amount compared with the battery cells in the middle, resulting in significantly lower temperatures of the battery cells on both sides of the battery module, thus leading to a large temperature difference in the system. The inconsistent temperatures of the battery cells during long-term use ultimately lead to inconsistent attenuation of the battery cell life, and further affect the life of the entire battery system.

[0004] In the related art, usually in order to slow down the heat dissipation of the battery cells at both ends, a heat insulation foam is added between the battery cells at both ends and the end plates. However, when the battery module is assembled into a group, a certain extrusion force needs to be applied, and at the same time, during long-term charge and discharge cycles of the battery, the expansion force of the battery will gradually increase. This extrusion force will compress the heat insulation foam, reducing the pores in the heat insulation foam, thereby greatly reducing the heat insulation effect of the heat insulation foam and failing to meet the original designed heat insulation requirements.

[0005] Therefore, how to improve the reliability of the battery module heat insulation device is a technical problem that those skilled in the art need to solve currently. Content of the Utility Model

[0006] The purpose of the utility model is to provide a battery module heat insulation device and a battery module, which can ensure the consistency of the overall heat dissipation of the battery module and effectively extend the service life of the battery module.

[0007] To achieve the above object, the utility model provides the following technical solutions:

[0008] A battery module heat insulation device is applied to a battery module. The battery module includes end plates, insulating sheets, and a plurality of battery cells arranged in sequence. The insulating sheets are located between the battery cells and the end plates. The device includes:

[0009] A heat insulation foam is arranged between the insulating sheet and the end plate;

[0010] A buffer limiting member is provided. The buffer limiting member is located at the periphery of the heat insulating foam. The two sides of the buffer limiting member are respectively attached to the insulating sheet and the end plate. When the insulating sheet approaches the end plate, the buffer limiting member can be compressed, and moreover, the compression stress of the buffer limiting member is greater than the compression stress of the heat insulating foam.

[0011] On the other hand, the thickness of the buffer limiting member is greater than or equal to the thickness of the heat insulating foam, and the thickness direction of the buffer limiting member and the thickness direction of the heat insulating foam are both perpendicular to the end plate.

[0012] On the other hand, the buffer limiting member is strip-shaped, the heat insulating foam is square-shaped, and the buffer limiting members are provided on both the left and right sides and / or both the upper and lower sides of the heat insulating foam.

[0013] On the other hand, the buffer limiting member is a rubber strip or a silicone strip, and the thickness of the buffer limiting member in the direction perpendicular to the end plate.

[0014] On the other hand, both the heat insulating foam and the buffer limiting member are pre-adhered and provided on the insulating sheet, so that the heat insulating foam, the buffer limiting member and the insulating sheet form an integral structure.

[0015] On the other hand, it further includes:

[0016] A detection and feedback component, which is installed on one side of the end plate close to the insulating sheet and is used to detect the distance between the end plate and the insulating sheet;

[0017] A controller, which is connected to the detection and feedback component and is used to send an alarm signal when the distance between the end plate and the insulating sheet is less than a preset distance.

[0018] On the other hand, the detection and feedback component is a pressure sensor. When the pressure value of the pressure sensor is greater than a preset pressure value, it sends a prompt message to the controller.

[0019] On the other hand, it further includes a warning component. The warning component is connected to the controller, and the warning component sends a warning signal after receiving the instruction of the controller.

[0020] On the other hand, the warning component is a buzzer or a warning light.

[0021] The present utility model also provides a battery module, including the battery module heat insulation device described in any one of the above.

[0022] The battery module and the battery module heat insulation device provided by the present utility model are applied to a battery module. The battery module includes an end plate, an insulating sheet, and a plurality of battery cells. Each of the battery cells is arranged in sequence, and the insulating sheet is located between the battery cell and the end plate. The battery module heat insulation device includes: a heat insulation foam, which is arranged between the insulating sheet and the end plate; a buffer limiting member, which is located at the periphery of the heat insulation foam. Both sides of the buffer limiting member are respectively attached to the insulating sheet and the end plate. When the insulating sheet approaches the end plate, the buffer limiting member can be compressed, and moreover, the compression stress of the buffer limiting member is greater than the compression stress of the heat insulation foam. In the battery module heat insulation device provided by the present utility model, by arranging the heat insulation foam between the end plate and the insulating sheet, the heat insulation foam has a low thermal conductivity coefficient, which can prevent the battery cells from dissipating heat through the end plate, making the temperatures of the battery cells uniform and the performance of the battery module stable. At the same time, due to the expansion of the battery cores in the battery cells, the heat insulation foam will be extruded, resulting in a decrease in the heat insulation effect of the heat insulation foam. In this application, by adding the buffer limiting member between the insulating sheet and the end plate, and the compression stress of the buffer limiting member is greater than the compression stress of the heat insulation foam. When the battery cells expand and deform and compress the heat insulation foam, due to the addition of the buffer limiting member, the buffer limiting member can withstand a certain degree of compression deformation and absorb the deformation of the battery cores in the battery cells, thereby preventing the heat insulation foam from being extruded and reducing the influence on the heat insulation effect of the heat insulation foam.

[0023] The battery module provided by the present utility model is provided with the above-mentioned battery module heat insulation device. Since the battery module heat insulation device has the above-mentioned technical effects, therefore, the battery module provided with this battery module heat insulation device should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is an exploded structural schematic diagram of a specific embodiment of the battery module provided by the present utility model;

[0026] Figure 2 is Figure 1 the assembled structural schematic diagram of the battery module shown;

[0027] Figure 3 is Figure 1Top view of the battery module shown;

[0028] Figure 4 is Figure 3 Enlarged structural schematic diagram of part A in the battery module shown;

[0029] Figure 5 Structural schematic diagram of the battery module heat insulation device provided by the present utility model;

[0030] Figure 6 Schematic diagram of the control method of the battery module heat insulation device provided by the present utility model.

[0031] Reference numerals:

[0032] 1 - end plate; 11 - output pole base; 2 - insulating sheet; 3 - battery cell; 4 - heat insulation foam; 5 - buffer limiting member; 6 - detection and feedback component; 7 - controller; 8 - warning component; 9 - steel strip; 10 - electrical connection structural member. Detailed implementation manners

[0033] The core of the present utility model is to provide a battery module heat insulation device and a battery module, which can effectively buffer the battery module while ensuring the heat insulation effect.

[0034] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0035] Please refer to Figures 1 to 3 , Figure 1 Exploded structural schematic diagram of a specific implementation manner of the battery module provided by the present utility model; Figure 2 is Figure 1 Assembly structural schematic diagram of the battery module shown; Figure 3 is Figure 1 Top view of the battery module shown.

[0036] In this implementation manner, the battery module heat insulation device is applied to the battery module. The battery module includes an end plate 1, an insulating sheet 2, and a plurality of battery cells 3. The battery cells 3 are arranged in sequence, and the insulating sheet 2 is located between the battery cells 3 and the end plate 1; after the insulating sheet 2, the battery cells 3, and the end plate 1 are assembled, they are fixed by steel strips 9. Generally, there are two steel strips 9, one on the top and one on the bottom; an electrical connection structural member 10 is provided on the top of the battery cell 3 to realize electrical connection with an external device.

[0037] Furthermore, please refer toFigure 4 , Figure 4 is Figure 3 a schematic enlarged view of part A in the battery module shown; the battery module heat insulation device includes:

[0038] a heat insulation foam 4, arranged between the insulating sheet 2 and the end plate 1;

[0039] a buffer limiting member 5, the buffer limiting member 5 is located at the periphery of the heat insulation foam 4, both sides of the buffer limiting member 5 are respectively attached to the insulating sheet 2 and the end plate 1. When the insulating sheet 2 and the end plate 1 approach each other, the buffer limiting member 5 can be compressed, and moreover, the compression stress of the buffer limiting member 5 is greater than the compression stress of the heat insulation foam 4.

[0040] Specifically, the battery cell 3 includes a battery core. The expansion of the battery core will cause the battery cell 3 to expand. After multiple battery cells 3 expand, they will squeeze the end plate 1 located at the end of the battery module. The insulating sheet 2 can play the role of insulation and protecting the battery core; the heat insulation foam 4 can provide excellent heat insulation, buffering, flame retardancy, sealing, support, shock absorption and other functions in the power battery pack; the compression stress of the buffer limiting member 5 is greater than the compression stress of the heat insulation foam 4. The compression stress is the value obtained by dividing the compression load applied to the specimen by the original cross-sectional area of the specimen during the compression test. By setting the compression stress of the buffer limiting member 5 to be greater than the compression stress of the heat insulation foam 4, it is ensured that when the distance between the end plate 1 and the insulating sheet decreases, the acting force will be applied to the buffer limiting member 5 instead of compressing the heat insulation foam 4.

[0041] For the battery module heat insulation device provided by the present utility model, by arranging the heat insulation foam 4 between the end plate 1 and the insulating sheet 2, the heat insulation foam 4 has a low thermal conductivity, which can prevent the battery cell 3 from dissipating heat through the end plate 1, making the temperatures of the battery cells 3 uniform and the performance of the battery module stable; at the same time, due to the expansion of the battery core in the battery cell 3, it will squeeze the heat insulation foam 4, resulting in a decrease in the heat insulation effect of the heat insulation foam 4. In this application, by adding a buffer limiting member 5 between the insulating sheet 2 and the end plate 1, and the compression stress of the buffer limiting member 5 is greater than the compression stress of the heat insulation foam 4. When the battery cell 3 expands and deforms and compresses the heat insulation foam 4, due to the addition of the buffer limiting member 5, the buffer limiting member 5 can withstand a certain degree of compression deformation and absorb the deformation of the battery core in the battery cell 3, thus avoiding squeezing the heat insulation foam 4 and reducing the impact on the heat insulation effect of the heat insulation foam 4.

[0042] In some embodiments, the thickness of the buffer limiting member 5 is greater than or equal to the thickness of the heat-insulating foam 4, and the thickness directions of both the buffer limiting member 5 and the heat-insulating foam 4 are perpendicular to the end plate 1. Specifically, the relatively larger thickness of the buffer limiting member can ensure that the pressure between the end plate 1 and the insulating sheet 2 will first act in the thickness direction of the buffer limiting member 5, thereby reducing the impact on the heat-insulating foam 4. Of course, without affecting the effect of the heat-insulating foam 4, after the buffer limiting member 5 is compressed to a certain extent, it can slightly compress the heat-insulating foam 4. When the compression range of the heat-insulating foam 4 is large, the battery cell 3 needs to be maintained.

[0043] In some embodiments, the buffer limiting member 5 is strip-shaped, the heat-insulating foam 4 is square, and the buffer limiting member 5 is provided on both the left and right sides and / or the upper and lower sides of the heat-insulating foam 4. Specifically, the strip-shaped buffer limiting member 5 can be arranged on both the left and right sides of the heat-insulating foam 4 and extend in the vertical direction, or can be provided on the upper and lower sides of the heat-insulating foam 4 and extend in the horizontal direction. Alternatively, the buffer limiting member 5 can also be a square frame that surrounds the periphery of the heat-insulating foam 4. The buffer limiting member 5 with a square frame structure is more convenient to install. Further, the buffer limiting member 5 can be adhesively provided on the end plate 1 or the insulating sheet 2. An installation groove can be opened on the end plate 1, and a part of the structure of the buffer limiting member 5 can be embedded in the installation groove, which is convenient to install and has a stable position. It should be noted that the above buffer limiting member 5 is arranged in the vertical and horizontal directions with the output pole base 11 on the end plate 1 facing upward in the vertical direction as the reference, as Figure 1 shown.

[0044] In some embodiments, the buffer limiting member 5 is a rubber strip or a silicone strip, and the thickness of the buffer limiting member 5 in the direction perpendicular to the end plate 1. Specifically, the rubber strip or the silicone strip has good elasticity and, at the same time, has a certain hardness, can absorb the deformation caused by the swelling of the water-absorbing battery core, and can also provide favorable support for the end part to ensure the heat-insulating effect of the heat-insulating foam 4.

[0045] In some embodiments, the number of the heat-insulating foams 4 is at least two, and the buffer limiting member 5 is provided between two adjacent heat-insulating foams 4. Specifically, there can be multiple heat-insulating foams 4, and the buffer limiting member 5 is provided between adjacent heat-insulating foams 4. At this time, the buffer limiting member 5 is preferably strip-shaped. By providing the buffer limiting member 5 between adjacent heat-insulating foams 4, it can further prevent the end plate 1 from over-compressing the heat-insulating foam 4. The buffer limiting member 5 can provide a better supporting effect on the end plate 1. At the same time, since the battery core is generally located in the middle of the battery body, by providing the buffer limiting member 5 between adjacent heat-insulating foams 4, the expansion deformation of the battery body can be better absorbed.

[0046] In some embodiments, the heat insulation foam 4 and the buffer limiting member 5 are both pre-adhered and arranged on the insulating sheet 2, so that the heat insulation foam 4, the buffer limiting member 5 and the insulating sheet 2 form an integral structure, as Figure 5 shown Figure 5 is a schematic structural diagram of the battery module heat insulation device provided by the present utility model. Specifically, the heat insulation foam 4, the buffer limiting member 5, and the insulating sheet 2 can be fixed by adhesive tape and integrated into a component, which is convenient for assembly.

[0047] In some embodiments, please refer to Figure 6 , Figure 6 is a schematic diagram of the control method of the battery module heat insulation device provided by the present utility model. The battery module heat insulation device further includes:

[0048] a detection and feedback component 6, installed on one side of the end plate 1 close to the insulating sheet 2, for detecting the distance between the end plate 1 and the insulating sheet 2;

[0049] a controller 7, connected to the detection and feedback component 6, for sending an alarm signal when the distance between the end plate 1 and the insulating sheet 2 is less than a preset distance.

[0050] Specifically, through the setting of the detection and feedback component 6, the distance between the end plate 1 and the insulating sheet 2 can be detected to detect whether the heat insulation foam 4 is compressed or compressed to a certain extent; when the heat insulation foam 4 is compressed to affect the heat dissipation effect, that is, when the distance between the end plate 1 and the insulating sheet 2 is less than the preset distance, the controller 7 sends an alarm signal to prompt the staff to check, so as to replace the heat insulation foam 4 or the buffer limiting member 5 to ensure the stable performance of the battery module.

[0051] In some embodiments, the detection and feedback component 6 is a pressure sensor, and when the pressure value of the pressure sensor is greater than the preset pressure value, a prompt message is sent to the controller 7. Specifically, when the distance between the end plate 1 and the insulating sheet 2 decreases, the pressure detected by the pressure sensor will be greater. Through the pressure change in the pressure sensor, the distance between the end plate 1 and the insulating sheet 2 is judged, so as to judge whether the heat insulation foam 4 is compressed or compressed to a certain extent, with high detection accuracy and good feedback effect. Of course, the detection and feedback component 6 can also be a position sensor. Specifically, a position sensor is installed on the end plate 1. When the battery body expands and the heat insulation foam 4 moves to fit with the end plate 1, the controller 7 sends an alarm signal, indicating that if the battery body continues to expand, the heat insulation foam 4 will be compressed, affecting the heat insulation effect.

[0052] In some embodiments, a warning component 8 is further included. The warning component 8 is connected to the controller 7. After receiving the instruction from the controller 7, the warning component 8 emits a warning signal. Through the setting of the warning component 8, it is more convenient to check.

[0053] In some embodiments, the warning component 8 is a buzzer or a warning light, which can effectively remind the staff to check and repair in time.

[0054] In a specific embodiment, the battery module heat insulation device includes a heat insulation foam 4 and a buffer limiting member 5. The buffer limiting member 5 is strip-shaped. Two or four buffer limiting members 5 are arranged on both sides of the heat insulation foam 4. The thickness of the buffer limiting member 5 is equal to or slightly higher than the thickness of the heat insulation foam 4. At the same time, the buffer limiting member 5 also has a certain compression deformation, but the compression stress of the buffer limiting member 5 is much higher than the compression stress of the foam. When the end plate 1 squeezes the battery cell, the acting force is transmitted to the battery cell through the buffer limiting member 5, thereby avoiding squeezing the heat insulation foam 4 and reducing the heat insulation effect of the heat insulation foam 4. At the same time, the elastic deformation of the buffer limiting member 5 can absorb the expansion of the battery cell, which can effectively reduce the heat dissipation of the battery cells at both ends of the battery module, thereby controlling the temperature difference of the entire battery module and the entire battery system, ensuring the consistency of the battery, and delaying the service life of the battery; This solution uses conventional heat insulation materials. Compared with heat insulation materials such as aerogel, while ensuring the same heat insulation effect, the cost can be greatly reduced; This heat dissipation device can also buffer the battery body and absorb the expansion of the battery cell while ensuring the heat insulation effect.

[0055] In addition to the above battery module heat insulation device, the present invention also provides a battery module including the above battery module heat insulation device. For the structures of other parts of this battery module, reference can be made to the prior art and will not be elaborated herein.

[0056] In this specification, the various embodiments are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0057] The above has introduced the battery module heat insulation device provided by the present invention in detail. Specific examples are used herein to elaborate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A battery module heat insulation device is applied to a battery module. The battery module includes an end plate (1), an insulating sheet (2), and a plurality of battery cells (3). Each of the battery cells (3) is arranged in sequence, and the insulating sheet (2) is located between the battery cell (3) and the end plate (1); characterized in that, Including: A heat-insulating foam (4) disposed between the insulating sheet (2) and the end plate (1); A buffer limiting member (5), the buffer limiting member (5) is located at the periphery of the heat-insulating foam (4), both sides of the buffer limiting member (5) are respectively attached to the insulating sheet (2) and the end plate (1), when the insulating sheet (2) and the end plate (1) approach each other, the buffer limiting member (5) can be compressed, and the compression stress of the buffer limiting member (5) is greater than the compression stress of the heat-insulating foam (4).

2. The battery module heat insulation device according to claim 1, wherein The thickness of the buffer limiting member (5) is greater than or equal to the thickness of the heat-insulating foam (4), and the thickness directions of the buffer limiting member (5) and the heat-insulating foam (4) are both perpendicular to the end plate (1).

3. The battery module heat insulation device according to claim 1, wherein The buffer limiting member (5) is strip-shaped, the heat-insulating foam (4) is square-shaped, and the buffer limiting member (5) is provided on both the left and right sides and / or the upper and lower sides of the heat-insulating foam (4).

4. The battery module heat insulation device according to claim 3, characterized in that, The buffer limiting member (5) is a rubber strip or a silicone strip, and the thickness of the buffer limiting member (5) in the direction perpendicular to the end plate (1).

5. The battery module heat insulation device according to claim 1, wherein, The heat-insulating foam (4) and the buffer limiting member (5) are both pre-adhered and disposed on the insulating sheet (2) so that the heat-insulating foam (4), the buffer limiting member (5) and the insulating sheet (2) form an integral structure.

6. The battery module heat insulation device according to any one of claims 1 to 5, characterized in that Further including: A detection and feedback component (6) installed on one side of the end plate (1) close to the insulating sheet (2) for detecting the distance between the end plate (1) and the insulating sheet (2); A controller (7) connected to the detection and feedback component (6) for sending an alarm signal when the distance between the end plate (1) and the insulating sheet (2) is less than a preset distance.

7. The battery module heat insulation device according to claim 6, wherein, The detection and feedback component (6) is a pressure sensor, and when the pressure value of the pressure sensor is greater than a preset pressure value, a prompt message is sent to the controller (7).

8. The battery module heat insulation device according to claim 6, wherein, Further including a warning component (8), the warning component (8) is connected to the controller (7), and the warning component (8) sends a warning signal after receiving the instruction of the controller (7).

9. The battery module heat insulation device according to claim 8, characterized in that, The warning component (8) is a buzzer or a warning light.

10. A battery module, comprising a battery module and a battery module heat insulation device, characterized in that, The battery module heat insulation device is the battery module heat insulation device according to any one of claims 1 to 9.

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