Battery pack

Abstract

The utility model discloses a battery pack which comprises two modules which are arranged along the up-down direction of the battery pack, and a battery pack body, the cold plate is located between the two modules and connected with the two modules; and the two first heating films are located on the sides, away from each other, of the two modules correspondingly and connected with the closest module correspondingly. According to the battery pack disclosed by the utility model, the cold plate is positioned between the two modules and is respectively connected with the two modules, so that the thermal resistance can be effectively reduced, the cooling efficiency is improved, and the two first heating films are respectively positioned on one sides, far away from each other, of the two modules and are respectively connected with the nearest module; therefore, the two modules are respectively and rapidly heated, the temperature uniformity of the two modules in the heating process is ensured, the battery pack can be ensured to be always kept in the optimal working temperature range in the charging and discharging process and in different application scenes, the performance of the battery pack is effectively improved, and the service life of the battery pack is effectively prolonged.

Description

Technical Field

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

[0002] For battery packs composed of dual-layer modules, the heating film is typically placed in the middle layer, such as on a cooling plate. Its working principle involves heating the cooling plate via the heating film, which then transfers heat to the dual-layer modules. However, during the cooling phase, the presence of the heating film increases the thermal resistance between the cooling plate and the modules, thus reducing cooling efficiency. During the heating phase, the lower module is connected to the lower housing via adhesive, causing its temperature rise rate to be significantly constrained by the low-temperature environment of the lower housing. This results in a large temperature difference between the dual-layer modules, making it impossible to quickly and evenly heat both modules. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery pack that ensures the battery pack remains within its optimal operating temperature range during charging and discharging processes and in different application scenarios, effectively improving the battery pack's performance and lifespan.

[0004] A battery pack according to an embodiment of the present invention includes: two modules arranged in a vertical direction along the battery pack; a cold plate located between the two modules and connected to each of the two modules; and two first heating films located on the side of each module away from each other and connected to the module closest to it.

[0005] According to the battery pack of this utility model embodiment, two modules are arranged along the vertical direction of the battery pack. A cold plate is located between the two modules and connected to each of the two modules respectively, which can effectively reduce thermal resistance and improve cooling efficiency. Two first heating films are located on the side of the two modules away from each other and are connected to the nearest module respectively, thereby enabling the two modules to be heated quickly and ensuring the temperature uniformity of the two modules during the heating process. This ensures that the battery pack is always kept within the optimal operating temperature range during charging and discharging and in different application scenarios, effectively improving the performance and service life of the battery pack.

[0006] In some embodiments of this utility model, the module includes a plurality of battery cells arranged along the length direction of the module, and the first heating film includes a plurality of sub-heating films spaced apart along the width direction of the module, the sub-heating films extending along the length direction of the module.

[0007] In some embodiments of this utility model, the module length is a, and the dimension of the sub-heating film along the width direction of the module is b, wherein 1 / 4a≤b≤1 / 3a.

[0008] In some embodiments of this utility model, it further includes: a pressure plate located on the side of the uppermost first heating film away from the module; and a first thermally conductive adhesive located between the uppermost first heating film and the uppermost module, for connecting the uppermost plurality of sub-heating films to the uppermost module and the pressure plate to the uppermost module.

[0009] In some embodiments of this utility model, it further includes: a lower housing having a receiving groove, wherein both modules are located within the receiving groove; and a second thermally conductive adhesive located between the lowermost module and the lowermost first heating film, for connecting the lowermost plurality of sub-heating films to the lowermost module and the bottom wall of the receiving groove to the lowermost module.

[0010] In some embodiments of this utility model, it further includes: two end plates, which are respectively located on both sides of the module in the length direction; two second heating films, which are respectively located on the side of the two end plates facing each other and connected to the nearest end plate, and the two second heating films are respectively connected to at least one first heating film through a transition section.

[0011] In some embodiments of this utility model, the module has two insulation plates at both ends along its length. The two insulation plates are located on the side of the two second heating films facing each other and are connected to the second heating film that is closest to them.

[0012] In some embodiments of this utility model, the dimension of the transition section along the width direction of the module is 15mm-25mm.

[0013] In some embodiments of this utility model, it further includes: a cable outlet package, wherein there are two cable outlet packages that correspond one-to-one with the two first heating films, and the plurality of heating wires in the first heating film are respectively connected to the corresponding cable outlet packages, and the two cable outlet packages are connected.

[0014] In some embodiments of this utility model, along the width direction of the module, the distance between the first heating film and the outer edge of the module is 15mm-25mm.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a structural diagram of the battery pack according to an embodiment of the present utility model;

[0018] Figure 2 This is an exploded view of a battery pack according to an embodiment of the present utility model;

[0019] Figure 3 yes Figure 2 Enlarged view at point P;

[0020] Figure 4 This is a bottom view of the battery pack structure according to an embodiment of the present utility model, in which only the bottommost module, the bottommost first heating film, the transition section, the second thermally conductive adhesive, the second heating film and the end plate are shown;

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

[0022] Figure 6 This is a front view of a battery pack according to an embodiment of the present utility model;

[0023] Figure 7 This is a side view of a battery pack according to an embodiment of the present utility model.

[0024] Figure label:

[0025] 100. Battery pack;

[0026] 1. Module; 11. Battery cell;

[0027] 2. Cold-rolled steel plate;

[0028] 3. First heating film; 31. Sub-heating film;

[0029] 4. Pressure plate;

[0030] 51. First thermally conductive adhesive; 52. Second thermally conductive adhesive;

[0031] 6. Lower housing; 61. Receiving groove;

[0032] 71. End plate; 72. Insulation board;

[0033] 8. Second heating film;

[0034] 9. Transition section;

[0035] 10. Outgoing cable package. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] The battery pack 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0040] like Figures 1-3 As shown, according to an embodiment of the present invention, the battery pack 100 includes two modules 1, a cold plate 2, and two first heating films 3. The two modules 1 are arranged along the vertical direction of the battery pack 100. The cold plate 2 is located between the two modules 1 and connected to each of the two modules 1. The two first heating films 3 are located on the side of each module 1 furthest from each other and are connected to the module 1 closest to them.

[0041] Understandably, when the battery pack 100 needs heating, the two first heating films 3 are used to heat the modules 1 connected to them, thereby achieving rapid heating of both modules 1 separately. This effectively avoids the limitation of the temperature rise rate of the modules 1 by excessively low local temperatures in the battery pack 100 (for example, when the battery pack 100 is used in a vehicle, the lower temperature of the lower shell 6 of the battery pack 100 affects the heating efficiency of the module 1 located below), thus ensuring the temperature uniformity of the two modules 1 during the heating process. Simultaneously, when the battery pack 100 needs cooling, heat exchange is achieved between the cooling plate and the two modules 1, thereby cooling the two modules 1. The direct connection between the cooling plate and the two modules 1 effectively reduces thermal resistance, improves cooling efficiency, and makes the temperature distribution within the battery pack 100 more uniform. Therefore, this design ensures that the battery pack 100 remains within its optimal operating temperature range during charging and discharging and in different application scenarios, effectively improving the performance and lifespan of the battery pack 100.

[0042] According to the battery pack 100 of this utility model embodiment, two modules 1 are arranged along the vertical direction of the battery pack 100. A cold plate 2 is located between the two modules 1 and connected to each of the two modules 1, which can effectively reduce thermal resistance and improve cooling efficiency. Two first heating films 3 are located on the side of the two modules 1 away from each other and are connected to the module 1 closest to each other, thereby enabling the two modules 1 to be heated quickly and ensuring the temperature uniformity of the two modules 1 during the heating process. This ensures that the battery pack 100 is always kept within the optimal operating temperature range during charging and discharging and in different application scenarios, thereby improving the performance and service life of the battery pack 100.

[0043] In some embodiments of this utility model, such as Figures 2-4 As shown, module 1 includes multiple battery cells 11 arranged along the length of module 1, and the first heating film 3 includes multiple sub-heating films 31 spaced apart along the width of module 1, with the sub-heating films 31 extending along the length of module 1. Therefore, by heating the corresponding modules 1 with the multiple sub-heating films 31 respectively, the temperature distribution inside module 1 can be controlled more precisely, helping to reduce temperature gradients and ensuring that each battery cell 11 inside module 1 reaches the ideal temperature range, thereby improving the reliability of battery pack 100.

[0044] In a specific implementation, such as Figures 2-4 As shown, the first heating film 3 includes two sub-heating films 31 spaced apart along the width direction of the module 1.

[0045] In some embodiments of this utility model, such as Figure 4As shown, the length of module 1 is *a*, and the dimension of the sub-heating film 31 along the width direction of module 1 is *b*, where 1 / 4a ≤ b ≤ 1 / 3a. It is understandable that if the dimension of the sub-heating film 31 along the width direction of module 1 is too small, it may not effectively cover a sufficient area along the width direction of module 1, resulting in uneven heating and some areas experiencing excessively high or low temperatures. Conversely, if the dimension of the sub-heating film 31 along the width direction of module 1 is large, although it can cover a wider area, it increases energy consumption and manufacturing costs. Therefore, by setting the dimension *b* of the sub-heating film 31 along the width direction of module 1 to between 1 / 4a and 1 / 3a, a more uniform heating effect can be achieved while ensuring heating efficiency, and the cost and energy consumption of the battery pack 100 can be effectively controlled.

[0046] In some embodiments of this utility model, such as Figure 1 , Figure 2 and Figure 5 As shown, the battery pack 100 also includes a pressure plate 4 and a first thermally conductive adhesive 51. The pressure plate 4 is located on the side of the uppermost first heating film 3 away from the module 1, and the first thermally conductive adhesive 51 is located between the uppermost first heating film 3 and the uppermost module 1, for connecting the uppermost multiple sub-heating films 31 with the uppermost module 1 and the pressure plate 4 with the uppermost module 1.

[0047] Therefore, the pressure plate 4 can ensure the stability and fixation of the uppermost module 1 within the battery pack 100, effectively preventing the module 1 from shifting or deforming under vibration or impact, thereby ensuring the overall structural integrity and safety of the battery pack 100.

[0048] Furthermore, since the first thermally conductive adhesive 51 includes multiple sub-heating films 31 spaced apart along the width direction of the module 1, the first thermally conductive adhesive 51 connects the uppermost multiple sub-heating films 31 with the uppermost module 1 and the pressure plate 4 with the uppermost module 1. Simultaneously, the uppermost first heating film 31 transfers heat to the uppermost module 1 and the pressure plate 4 through the first thermally conductive adhesive 51, and the pressure plate 4 then transfers heat to the uppermost module 1, thereby ensuring uniform temperature across all areas of the uppermost module 1 and improving reliability.

[0049] In some embodiments of this utility model, such as Figures 1-7 As shown, the battery pack 100 also includes a lower housing 6 and a second thermally conductive adhesive 52. The lower housing 6 has a receiving groove 61, in which both modules 1 are located. The second thermally conductive adhesive 52 is located between the lowermost module 1 and the lowermost first heating film 3, and is used to connect the lowermost plurality of sub-heating films 31 with the lowermost module 1 and the bottom wall of the receiving groove 61 with the lowermost module 1.

[0050] Therefore, the lower housing 6 can provide a certain degree of protection for the two modules 1 and ensure the stability and fixation of the two modules 1 within the battery pack 100, thereby reducing the displacement or deformation of the modules 1 under vibration or impact and improving the reliability and safety of the battery pack 100.

[0051] Furthermore, since the first thermally conductive adhesive 51 includes a plurality of sub-heating films 31 spaced apart along the width direction of the module 1, the second thermally conductive adhesive 52 connects the lowermost plurality of sub-heating films 31 to the lowermost module 1 and the bottom wall of the receiving groove 61 to the lowermost module 1. Simultaneously, the lowermost first heating film 3 transfers heat to the lowermost module 1 and the bottom wall of the receiving groove 61 through the first thermally conductive adhesive 51, and the bottom wall of the receiving groove 61 then transfers heat to the lowermost module 1, thereby ensuring uniform temperature across all areas of the lowermost module 1 and improving reliability.

[0052] In some embodiments of this utility model, such as Figures 1-4 As shown, the battery pack 100 also includes two end plates 71 and two second heating films 8. The two end plates 71 are located on opposite sides of the module 1 along its length, and the two second heating films 8 are located on opposite sides of the two end plates 71 facing each other and connected to the nearest end plate 71. The two second heating films 8 are connected to at least one first heating film 3 via transition sections 9.

[0053] It is understandable that the module 1 includes multiple battery cells 11 arranged along the length of the module 1. In low-temperature environments or when the battery pack 100 is used in a vehicle and the vehicle is in motion, the battery cells 11 located at both ends of the length of the module 1 are more affected by the external environment, causing their temperature to drop rapidly. Therefore, two second heating films 8 are respectively located on the side of the two end plates 71 facing each other and connected to the nearest end plate 71, so that the two second heating films 8 can heat the battery cells 11 at both ends of the length of the module 1, further ensuring the temperature uniformity of the multiple battery cells 11 in the module 1 and improving the overall reliability of the battery pack 100.

[0054] Furthermore, by connecting two second heating films 8 to at least one first heating film 3 via transition sections 9, heat can be continuously and uniformly transferred between the two second heating films 8 and the first heating film 3 connected to the second heating films 8. The transition sections 9 also reduce heat loss during the transfer process, thereby improving overall heating efficiency. Simultaneously, the transition sections 9 serve to position and bond the heating films, effectively reducing assembly difficulty.

[0055] In some embodiments of this utility model, such as Figure 3 As shown, the module 1 has two insulation plates 72 at both ends along its length. The two insulation plates 72 are located on the side of the two second heating films 8 facing each other and are connected to the second heating film 8 that is closest to them.

[0056] Therefore, this arrangement allows the heat from the second heating film 8 to be transferred to the module 1 through the insulation plate 72, ensuring uniform temperature within the module 1. Furthermore, the insulation plate 72 reduces the impact of the external environment on the battery cells 11 located at both ends of the module 1's length, improving the performance of the battery pack 100. Simultaneously, the insulation plate 72 prevents direct contact between the second heating film 8 and the battery cells 11, reducing the risk of the blue film on the battery cells 11 being scratched and improving the reliability of the battery pack 100.

[0057] In some embodiments of this invention, the transition section has a width of 15mm-25mm along the module 1. Since the second heating film 8 and the first heating film 3 are connected by the transition section 9, a transition section 9 that is too narrow may cause heat to accumulate during transfer, resulting in localized overheating, and also reduces its structural strength. Conversely, a transition section 9 that is too wide may increase the resistance to heat transfer and reduce heating efficiency. Therefore, by limiting the size of the transition section 9 to between 15mm and 25mm, effective heat transfer can be ensured while avoiding localized overheating or uneven heating.

[0058] In some embodiments of this utility model, such as Figures 1-3 and Figure 7 As shown, the battery pack 100 also includes a wiring harness 10. The wiring harness 10 consists of two units, each corresponding to one of the two first heating films 3. Multiple heating wires within the first heating film 3 are connected to their respective wiring harnesses 10, and the two wiring harnesses 10 are connected together. Thus, the wiring harness 10 can connect to and lead out the multiple heating wires within the corresponding first heating film 3. Simultaneously, the two connected wiring harnesses 10 can be connected to an external power supply or control unit via a common lead-out component (such as a terminal block, plug, etc.), thereby simplifying the wiring structure of the battery pack 100 and the components using the battery pack 100, and reducing the complexity of installation and maintenance.

[0059] In some embodiments of this invention, the distance between the first heating film 3 and the outer edge of the module 1 along the width direction of the module 1 is 15mm-25mm. It is understood that the outer edge of the module 1 is typically a relatively fragile part, easily susceptible to external impact or damage. Therefore, by maintaining a certain distance between the first heating film 3 and the outer edge of the module 1, the heating film can be prevented from being directly exposed to vulnerable areas, and the first heating film 3 will not be affected by deformation or displacement of the edge of the module 1 during installation and use, thereby protecting the structural integrity of the heating film and improving the reliability of the battery pack 100.

[0060] Other configurations and operations of the battery pack 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: Two modules are arranged along the vertical direction of the battery pack; A cold plate, which is located between the two modules and connected to the two modules respectively; Two first heating films are located on the side of the two modules furthest from each other and are respectively connected to the module closest to them.

2. The battery pack according to claim 1, characterized in that, The module includes a plurality of battery cells arranged along the length of the module, and the first heating film includes a plurality of sub-heating films spaced apart along the width of the module, the sub-heating films extending along the length of the module.

3. The battery pack according to claim 2, characterized in that, The module has a length of a, and the sub-heating film has a dimension of b along the width of the module, wherein 1 / 4a ≤ b ≤ 1 / 3a.

4. The battery pack according to claim 2, characterized in that, Also includes: A pressure plate, located on the side of the uppermost first heating film away from the module; The first thermally conductive adhesive is located between the uppermost first heating film and the uppermost module, and is used to connect the uppermost plurality of sub-heating films to the uppermost module and the pressure plate to the uppermost module.

5. The battery pack according to claim 2, characterized in that, Also includes: The lower housing has a receiving groove, and both modules are located within the receiving groove; The second thermally conductive adhesive is located between the lowest module and the lowest first heating film, and is used to connect the lowest plurality of sub-heating films to the lowest module and the bottom wall of the receiving groove to the lowest module.

6. The battery pack according to claim 1, characterized in that, Also includes: Two end plates, which are respectively located on both sides of the module's length direction; Two second heating films are located on the side of the two end plates facing each other and connected to the nearest end plate. The two second heating films are connected to at least one first heating film through a transition section.

7. The battery pack according to claim 6, characterized in that, The module has two insulation plates at both ends along its length. The two insulation plates are located on the side of the two second heating films facing each other and are connected to the second heating film that is closest to them.

8. The battery pack according to claim 6, characterized in that, The transition section has a dimension of 15mm-25mm along the width direction of the module.

9. The battery pack according to claim 1, characterized in that, Also includes: The cable outlets are two cable outlets that correspond one-to-one with the two first heating films. Multiple heating wires in the first heating films are connected to the corresponding cable outlets, and the two cable outlets are connected together.

10. The battery pack according to claim 1, characterized in that, Along the width direction of the module, the distance between the first heating film and the outer edge of the module is 15mm-25mm.

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