Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a module assembly and a battery pack, the first beam is arranged on at least one side of the two sides, in the first direction, of the module assembly; the heating film comprises a body part and a bent part, the body part is located above the module assembly and connected with the module assembly, one end of the bent part is connected with the body part, the other end of the bent part is bent downwards, and at least part of the bent part is located on the side, away from the module assembly, of the first beam and connected with the first beam. According to the battery pack disclosed by the utility model, the module assembly is heated by the body part, and the first beam is heated by the bending part, so that the temperature of the battery cell of the module assembly close to the first beam is ensured, the temperature uniformity of the battery cell in the module assembly is ensured, the performance of the battery pack is improved, and the service life of the battery pack is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] As new energy vehicles are moving towards cost reduction, battery packs are beginning to use direct cooling plates instead of liquid cooling plates, and the modules are heated to the optimal operating temperature at low temperatures through a heating film bonded to the upper surface of the module. However, during the heating process of the module, the heat dissipation rate of the cells at the edge of the module is higher than that of the cells in the middle area, resulting in a temperature difference in the cells inside the module, which reduces the performance and service life of the battery pack. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery pack, which ensures the temperature uniformity of the battery cells in the module assembly, thereby improving the performance and service life of the battery pack.

[0004] According to the battery pack of the embodiment of the utility model, it includes: a module assembly; a first beam, the first beam is provided on at least one of the two sides of the module assembly along a first direction; a heating film, the heating film includes a main body and a bending portion, the main body is located above the module assembly and connected to the module assembly, one end of the bending portion is connected to the main body, and the other end is bent downward, and at least a part of the bending portion is located on the side of the first beam away from the module assembly and connected to the first beam.

[0005] According to the battery pack of the embodiment of the utility model, a first beam is provided on at least one of the two sides of the module assembly along the first direction, and the heating film includes a main body portion and a bending portion. The main body portion is located above the module assembly and connected to the module assembly, one end of the bending portion is connected to the main body portion, and the other end is bent downward, and at least a part of the bending portion is located on a side of the first beam away from the module assembly and connected to the first beam. The module assembly is heated by the main body portion and the bending portion heats the first beam to ensure the temperature of the battery cells of the module assembly close to the first beam, thereby ensuring the temperature uniformity of the battery cells in the module assembly, thereby improving the performance and service life of the battery pack.

[0006] In some embodiments of the present invention, the heating film further comprises a connecting portion, one end of which is connected to the main body portion, and the other end of which is connected to an end of the bending portion away from the main body portion.

[0007] In some embodiments of the present invention, the connecting portion includes a first section and a second section, one end of the first section is connected to the main body, and the other end extends downward and is connected to the second section, and the second section is located above the first beam and is connected to the bending portion at one end facing away from the first section.

[0008] In some embodiments of the present utility model, the body portion has a mating hole that penetrates the body portion in the thickness direction of the body portion, and the battery pack further includes a pressure strip, and the pressure strip is located in the mating hole and is connected to the module assembly.

[0009] In some embodiments of the present utility model, it further includes: a direct cooling plate, the direct cooling plate is located below the module assembly and the first beam, and both the module assembly and the first beam are connected to the direct cooling plate.

[0010] In some embodiments of the present utility model, the module assembly and the direct cooling plate are adhesively connected, and there is a first blocking member between the first beam and the module assembly. One end of the first blocking member is connected to the first beam, and the other end abuts against the module assembly.

[0011] In some embodiments of the present utility model, along the up and down direction, the distance between the first blocking member and the direct cooling plate is 2 mm - 7 mm.

[0012] In some embodiments of the present utility model, the module assembly includes a plurality of modules, the plurality of modules are arranged along the first direction, there is a second beam between any two adjacent modules, the second beam is located above the direct cooling plate and is connected to the direct cooling plate, the heating film further includes a transition portion, and the body portions above any two adjacent modules are connected through the transition portion, and the transition portion is located above the second beam and is connected to the second beam.

[0013] In some embodiments of the present utility model, there is a second blocking member between the second beam and the adjacent module. One end of the second blocking member is connected to the second beam, and the other end abuts against the module.

[0014] In some embodiments of the present utility model, along the up and down direction, the distance between the second blocking member and the direct cooling plate is 2 mm - 7 mm.

[0015] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0016] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0017] Figure 1 is a partial exploded view of a battery pack according to an embodiment of the present utility model;

[0018] Figure 2 is Figure 1Enlarged view of area A;

[0019] Figure 3 It is a top view of a battery pack according to an embodiment of the present utility model;

[0020] Figure 4 is Figure 2 Enlarged view of area B;

[0021] Figure 5 It is a side view of a battery pack according to an embodiment of the present utility model;

[0022] Figure 6 It is a side view of the battery pack from another perspective according to an embodiment of the present utility model.

[0023] Reference numerals:

[0024] 100, battery pack;

[0025] 1, module assembly; 11, module;

[0026] 2, first beam;

[0027] 3, heating film; 31, body part; 311, mating hole; 32, bending part; 33, connecting part; 331, first section; 332, second section; 34, transition part;

[0028] 4, direct cooling plate;

[0029] 5, second beam;

[0030] 6, first blocking member;

[0031] 7, second blocking member. Detailed implementation manners

[0032] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0033] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0034] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model may be understood according to specific circumstances.

[0035] The battery pack 100 according to an embodiment of the present utility model will be described below with reference to the drawings.

[0036] As Figures 1-5 shown, the battery pack 100 according to an embodiment of the present utility model includes a module assembly 1, a first beam 2 and a heating film 3. Among them, at least one side of the two sides of the module assembly 1 along the first direction (such as Figure 1 and Figure 3 the first direction shown) is provided with a first beam 2. The heating film 3 includes a body portion 31 and a bending portion 32. The body portion 31 is located above the module assembly 1 and is connected to the module assembly 1. One end of the bending portion 32 is connected to the body portion 31, and the other end is bent downward. At least a part of the bending portion 32 is located on the side of the first beam 2 away from the module assembly 1 and is connected to the first beam 2.

[0037] It can be understood that the heating film 3 includes heating wires, and the heating function of the heating film 3 can be realized through the heating wires. Thus, when the module assembly 1 needs to be heated, the module assembly 1 is heated through the body portion 31, and the first beam 2 is heated through the bending portion 32, so as to simultaneously heat the module assembly 1 and the first beam 2, reduce the temperature difference between the first beam 2 and the battery cells of the module assembly 1 close to the first beam 2, and further reduce the thermal conductivity between the first beam 2 and the battery cells, ensure the temperature and cooling rate of the battery cells of the module assembly 1 close to the first beam 2, effectively ensure the temperature uniformity of the battery cells in the module assembly 1, and further improve the performance and service life of the battery pack 100. At the same time, the first beam 2 plays a certain role in protecting and supporting the module assembly 1 in the first direction, ensuring the reliability and safety of the battery pack 100.

[0038] Furthermore, the body portion 31 and the module assembly 1 are adhesively connected. Thus, the connection between the two is realized through adhesive connection, and the body portion 31 can be attached to the upper surface of the module assembly 1, further ensuring the uniform transfer of heat and further ensuring the temperature uniformity of the battery cells in the module assembly 1. At the same time, adhesive connection ensures the strength of the body portion 31 and the module assembly 1 while having a simple assembly process, improving the assembly efficiency of the battery pack 100. The bending portion 32 and the first beam 2 are adhesively connected. Thus, the connection between the two is realized through adhesive connection, and while ensuring the connection strength, the assembly process is simple, improving the assembly efficiency of the battery pack 100.

[0039] It should be noted that the heating film 3 according to the embodiments of the present invention is known to those of ordinary skill in the art, and will not be described in detail here.

[0040] For the battery pack 100 according to the embodiments of the present invention, at least one side of the two sides of the module assembly 1 in the first direction is provided with a first beam 2. The heating film 3 includes a body portion 31 and a bending portion 32. The body portion 31 is located above the module assembly 1 and connected to the module assembly 1. One end of the bending portion 32 is connected to the body portion 31, and the other end bends downward. At least a part of the bending portion 32 is located on the side of the first beam 2 facing away from the module assembly 1 and connected to the first beam 2. The module assembly 1 is heated through the body portion 31, and the first beam 2 is heated through the bending portion 32, ensuring the temperature of the battery cells of the module assembly 1 close to the first beam 2, thereby ensuring the temperature uniformity of the battery cells in the module assembly 1, and thus improving the performance and service life of the battery pack 100.

[0041] In some embodiments of the present invention, such as Figures 1-5As shown, the heating film 3 further includes a connecting portion 33. One end of the connecting portion 33 is connected to the main body portion 31, and the other end is connected to one end of the bending portion 32 that is away from the main body portion 31. Thus, the indirect connection between the main body portion 31 and the bending portion 32 is achieved through the connecting portion 33, so as to ensure the connection between the main body portion 31 and the module assembly 1 and the connection between the bending portion 32 and the first beam 2, improving the overall reliability.

[0042] In some embodiments of the present invention, as Figures 1-5 shown, the connecting portion 33 includes a first section 331 and a second section 332. One end of the first section 331 is connected to the main body portion 31, and the other end extends downward and is connected to the second section 332. The second section 332 is located above the first beam 2, and the end away from the first section 331 is connected to the bending portion 32. Thus, the reliability of the indirect connection between the main body portion 31 and the bending portion 32 is further ensured through the arrangement of the first section 331 and the second section 332. At the same time, since the second section 332 is located above the first beam 2, the upper surface of the first beam 2 is heated by the second section 332, further ensuring the temperature of the first beam 2, thereby ensuring the temperature of the battery cells of the module assembly 1 close to the first beam 2, and further ensuring the temperature uniformity of the battery cells in the module assembly 1.

[0043] In some embodiments of the present invention, as Figure 3 and Figure 4 shown, the main body portion 31 has a mating hole 311 that penetrates the main body portion 31 in the thickness direction of the main body portion 31. The battery pack 100 further includes a pressing strip (not shown in the figure), and the pressing strip is located in the mating hole 311 and is connected to the module assembly 1.

[0044] It can be understood that when the heating film 3 is electrified and heated, due to the uneven distribution of the resistance wires and the flow of the current, relatively high temperatures may be generated in local areas. Thus, by providing through holes in the heating film 3, the distribution path of the heat flow can be changed, enabling the heat to be more evenly distributed on the surfaces of the module assembly 1 and the first beam 2, further ensuring the temperature uniformity of the battery cells in the module assembly 1. At the same time, since the pressing strip is located in the mating hole 311 and is connected to the module assembly 1, the pressing strip improves the overall structural strength of the battery pack 100.

[0045] Furthermore, the mating holes 311 are multiple spaced apart along a first direction and / or multiple spaced apart along a second direction, and the pressing strips are located in the multiple mating holes 311 in one-to-one correspondence. The first direction, the second direction, and the up-and-down direction are perpendicular to each other in pairs.

[0046] In some embodiments of the present invention, as Figures 1-6As shown, the battery pack 100 further includes a direct cooling plate 4. Among them, the direct cooling plate 4 is located below the module assembly 1 and the first beam 2, and both the module assembly 1 and the first beam 2 are connected to the direct cooling plate 4. Thus, when the module assembly 1 needs to be cooled down, the direct cooling plate 4 cools down the module assembly 1 to ensure the normal operation of the battery pack 100, and improve the reliability and service life of the battery pack 100. At the same time, the direct cooling plate 4 located below the module assembly 1 plays a certain protective role for the module assembly 1, further improving the reliability of the battery pack 100.

[0047] Furthermore, the battery pack 100 further includes a lower housing, the lower housing is located below the direct cooling plate 4, and the direct cooling plate 4 is connected to the lower housing through structural adhesive and fasteners. Thus, the fixation of the direct cooling plate 4 is achieved through such a setting.

[0048] In some embodiments of the present invention, as Figure 1 and Figure 6 shown, the module assembly 1 and the direct cooling plate 4 are adhesively connected, there is a first blocking member 6 between the first beam 2 and the module assembly 1, one end of the first blocking member 6 is connected to the first beam 2, and the other end abuts against the module assembly 1.

[0049] It can be understood that the connection between the module assembly 1 and the direct cooling plate 4 is realized through adhesive connection, ensuring uniform heat transfer, and further ensuring the temperature uniformity of the battery cells in the module assembly 1. At the same time, while ensuring the strength of the module assembly 1 and the direct cooling plate 4, the adhesive connection has a simple assembly process and improves the assembly efficiency of the battery pack 100.

[0050] Since the module assembly 1 and the direct cooling plate 4 are adhesively connected, there is a possibility of glue overflow between the module assembly 1 and the first beam 2. Thus, a first blocking member 6 is provided between the first beam 2 and the module assembly 1 to block the glue overflow between the module assembly 1 and the first beam 2, thereby ensuring the connection strength and thermal conductivity between the module assembly 1 and the direct cooling plate 4, reducing the short - circuit risk of the battery pack 100, and effectively improving the reliability of the battery pack 100. At the same time, by connecting one end of the first blocking member 6 to the first beam 2 and abutting the other end against the module assembly 1, the blocking of the glue overflow by the first blocking member 6 is further ensured. Optionally, the first blocking member 6 is a foam.

[0051] Furthermore, the module assembly 1 and the direct cooling plate 4 are adhesively connected through a thermal conductive adhesive. Thus, while realizing the adhesive connection between the module assembly 1 and the direct cooling plate 4 through the thermal conductive adhesive, it further ensures uniform heat transfer and the cooling effect of the direct cooling plate 4 on the module assembly 1.

[0052] In some embodiments of the present invention, along the up - down direction, the distance between the first blocking member 6 and the direct cooling plate 4 is 2 mm - 7 mm.

[0053] It can be understood that if the distance between the first blocking member 6 and the direct cooling plate 4 is too small in the up-down direction, there is a possibility that the first blocking member 6 may be squeezed under the module assembly 1. At the same time, if the distance between the first blocking member 6 and the direct cooling plate 4 is too long, the overflow glue may be too long, resulting in a reduction in the heat conduction efficiency between the direct cooling plate 4 and the module assembly 1. Therefore, in the up-down direction, by limiting the distance between the first blocking member 6 and the direct cooling plate 4 to 2 mm - 7 mm, while achieving the blocking of the overflow glue by the first blocking member 6, the cooling and heat dissipation effect of the direct cooling plate 4 on the module assembly 1 is ensured. For example, in the up-down direction, by limiting the distance between the first blocking member 6 and the direct cooling plate 4 to 2 mm, 3 mm, 4 mm, 5 mm, 6 mm or 7 mm.

[0054] It should be noted that the first direction is perpendicular to the up-down direction, and the first direction can be understood as the left-right direction or the front-back direction.

[0055] In some embodiments of the present utility model, as Figure 1 and Figure 6 shown, the module assembly 1 includes a plurality of modules 11, the plurality of modules 11 are arranged in the first direction, there is a second beam 5 between any two adjacent modules 11, the second beam 5 is located above the direct cooling plate 4 and is connected to the direct cooling plate 4, the heating film 3 further includes a transition portion 34, the body portions 31 above any two adjacent modules 11 are connected by the transition portion 34, and the transition portion 34 is located above the second beam 5 and is connected to the second beam 5.

[0056] Therefore, the second beam 5 plays a certain protective and supporting role for the adjacent modules 11 in the first direction, and bears the expansion force of the modules 11, effectively ensuring the reliability and safety of the battery pack 100. At the same time, the second beam 5 is located above the direct cooling plate 4 and is connected to the direct cooling plate 4, ensuring the reliability of the second beam 5.

[0057] The connection of the body portions 31 above any two adjacent modules 11 is realized through the transition portion 34, so that the heating film 3 is an integral structure, which is convenient for the installation of the heating film 3. At the same time, the second beam 5 is heated through the transition portion 34, reducing the temperature difference between the second beam 5 and the battery cells of the modules 11 close to the second beam 5, thereby reducing the thermal conductivity coefficient between the two, ensuring the temperature and the cooling rate of the battery cells of the modules 11 close to the second beam 5, effectively ensuring the temperature uniformity of the battery cells in the modules 11, and further improving the performance and service life of the battery pack 100.

[0058] In some embodiments of the present utility model, as Figure 1 and Figure 6 shown, there is a second blocking member 7 between the second beam 5 and the adjacent module 11, one end of the second blocking member 7 is connected to the second beam 5, and the other end abuts against the module 11.

[0059] Thus, the second blocking member 7 is used to block the overflow glue between the module 11 and the second beam 5 between the second beam 5 and the adjacent module 11, thereby ensuring the connection strength and thermal conductivity between the module assembly 1 and the direct cooling plate 4, reducing the short - circuit risk of the battery pack 100, and effectively improving the reliability of the battery pack 100. At the same time, one end of the second blocking member 7 is connected to the second beam 5, and the other end abuts against the module 11, further ensuring the blocking of the overflow glue by the second blocking member 7. Optionally, the second blocking member 7 is a foam.

[0060] In some embodiments of the present utility model, along the up - down direction, the distance between the second blocking member 7 and the direct cooling plate 4 is 2 mm - 7 mm.

[0061] It can be understood that if the distance between the second blocking member 7 and the direct cooling plate 4 is too small along the up - down direction, the second blocking member 7 may be squeezed under the module assembly 1. At the same time, if the distance between the second blocking member 7 and the direct cooling plate 4 is too long, the overflow glue may be too long, resulting in a reduction in the heat conduction efficiency between the direct cooling plate 4 and the module assembly 1. Thus, by limiting the distance between the second blocking member 7 and the direct cooling plate 4 to 2 mm - 7 mm along the up - down direction, while realizing the blocking of the overflow glue by the second blocking member 7, the cooling and heat dissipation effect of the direct cooling plate 4 on the module assembly 1 is ensured. For example, by limiting the distance between the first blocking member 6 and the direct cooling plate 4 to 2 mm, 3 mm, 4 mm, 5 mm, 6 mm or 7 mm along the up - down direction.

[0062] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0063] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purposes of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: Module components; A first beam, wherein at least one of two sides of the module assembly along a first direction is provided with the first beam; A heating film, the heating film includes a main body and a bending portion, the main body is located above the module assembly and connected to the module assembly, one end of the bending portion is connected to the main body, and the other end is bent downward, and at least part of the bending portion is located on a side of the first beam away from the module assembly and connected to the first beam.

2. The battery pack according to claim 1, characterized in that: The heating film further comprises a connecting portion, one end of which is connected to the main body portion, and the other end of which is connected to an end of the bending portion away from the main body portion.

3. The battery pack according to claim 2, characterized in that: The connecting portion includes a first section and a second section, wherein one end of the first section is connected to the main body, and the other end extends downward and is connected to the second section, and the second section is located above the first beam and one end facing away from the first section is connected to the bending portion.

4. The battery pack according to claim 1, characterized in that: The main body has a matching hole that penetrates the main body along the thickness direction of the main body, and the battery pack also includes a pressure strip, which is located in the matching hole and connected to the module assembly.

5. The battery pack according to claim 1, characterized in that: Also includes: A direct cooling plate is located below the module assembly and the first beam, and both the module assembly and the first beam are connected to the direct cooling plate.

6. The battery pack according to claim 5, characterized in that: The module assembly is bonded to the direct cooling plate, a first blocking member is provided between the first beam and the module assembly, one end of the first blocking member is connected to the first beam, and the other end is in contact with the module assembly.

7. The battery pack according to claim 6, characterized in that: In the up-down direction, the distance between the first blocking member and the direct cooling plate is 2 mm-7 mm.

8. The battery pack according to claim 5, characterized in that: The module assembly includes a plurality of modules, and the plurality of modules are arranged along the first direction. A second beam is provided between any two adjacent modules, and the second beam is located above the direct cooling plate and connected to the direct cooling plate. The heating film also includes a transition portion, and the main body portions above any two adjacent modules are connected through the transition portion, and the transition portion is located above the second beam and connected to the second beam.

9. The battery pack according to claim 8, characterized in that: A second blocking member is provided between the second beam and the adjacent module, wherein one end of the second blocking member is connected to the second beam, and the other end thereof is in contact with the module.

10. The battery pack according to claim 9, characterized in that: In the up-down direction, the distance between the second blocking member and the direct cooling plate is 2 mm-7 mm.

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