Battery pack and energy storage equipment

Abstract

The utility model provides a battery pack and energy storage equipment. The battery pack comprises a shell, a plurality of battery cells, a plurality of busbars, a first heating film and a second heating film, the plurality of battery cells are arranged in the shell, each battery cell is provided with an electric connection end and a non-electric connection end which are opposite to each other, and positive electrodes and negative electrodes of the battery cells are positioned at the electric connection ends. And the busbars are connected with the electric connection ends. The first heating films are attached to the busbars. The second heating film is arranged at the non-electric connection ends of the battery cells, a plurality of heat conduction protrusions are arranged on the side, facing the battery cells, of the second heating film, and each heat conduction protrusion is tightly attached to the non-electric connection end of the corresponding battery cell. The two ends of each battery cell are heated through the first heating film and the second heating film, so that the temperature of the battery cells is more uniform, the temperature difference between the two ends of the battery cells is reduced, and compared with a heating mode that the battery cells are wrapped by a snakelike heating tape, the second heating film can be smoother, so that the occupied space is smaller, and the material consumption is lower; therefore, the overall size of the battery pack is reduced, and the cost is reduced.

Description

Technical Field

[0001] This application relates to the field of energy storage equipment technology, specifically a battery pack and energy storage equipment. Background Technology

[0002] CTC (Cell-to-Chassis) battery packs are gaining increasing attention in the industry due to their superior weight reduction and significant cost reduction advantages. The structural characteristics of CTC battery packs dictate that busbars are only located on one side.

[0003] In related technologies, the common practice is to directly heat the busbar to heat the battery cells. However, this results in only one end of the battery cell being heated, leading to insufficient heat uniformity. To improve uniformity, a serpentine heating band is usually wrapped around the outer wall of each battery cell. While this can achieve uniform heating of the battery cells, it also increases the overall volume of the battery pack due to the heating band wrapping around the cells, and the increased manufacturing cost due to the large amount of heating band used. Utility Model Content

[0004] In view of this, this application provides a battery pack and energy storage device that can both uniformly heat the battery cells and reduce the size and cost.

[0005] One embodiment of this application provides a battery pack, including a housing, multiple battery cells, multiple busbars, a first heating film, and a second heating film. The multiple battery cells are disposed within the housing, each cell having opposite electrical connection terminals and non-electrical connection terminals, with the positive and negative terminals of the cell located at the electrical connection terminals. Each busbar connects the electrical connection terminals of each battery cell, enabling series or parallel connection of the cells. The first heating film is attached to each busbar. The second heating film is disposed on the non-electrical connection terminals of the multiple battery cells, and has multiple thermally conductive protrusions on the side of the second heating film facing the multiple battery cells, each thermally conductive protrusion being in close contact with the non-electrical connection terminal of a corresponding battery cell.

[0006] The battery pack provided in this application heats the busbar through a first heating film during use. The heat from the first heating film is transferred to the electrical connection ends of each cell through the busbar. The non-electrical connection ends of each cell are also heated through the thermally conductive protrusions of the second heating film, ensuring that both ends of each cell are heated. This results in a more uniform cell temperature and reduces the temperature difference between the two ends of the cell. Furthermore, compared to heating methods that involve wrapping the cells with a serpentine heating band, the second heating film can directly contact the non-electrical connection ends of each cell in a roughly flat state. This eliminates the drawbacks of the winding assembly shape of the serpentine heating film, resulting in lower assembly costs. The first heating film can work in conjunction with the protrusions to directly contact and press against the non-electrical connection ends of each cell, achieving uniform heating of each cell. This provides a more cost-effective and reliable uniform heating of CTC-type cells.

[0007] In some embodiments, the second heating film has a through hole in each heat-conducting protrusion, and each through hole passes through the heat-conducting protrusion and the opposite sides of the second heating film.

[0008] In some embodiments, the second heating film is provided with a heating wire that passes through each heat-conducting protrusion along a preset path, and the heating wire heats each heat-conducting protrusion, thereby heating the corresponding battery cell for each heat-conducting protrusion.

[0009] In some embodiments, the second heating film is provided with a plurality of weight reduction holes and / or a plurality of mounting holes.

[0010] In some embodiments, the thermally conductive protrusions are elastic, and each thermally conductive protrusion is compressed by the corresponding battery cell.

[0011] In some embodiments, the second heating film has a corresponding first protrusion on the side of each heat-conducting protrusion away from the battery cell, and each first protrusion abuts against the corresponding heat-conducting protrusion toward the battery cell.

[0012] In some embodiments, the battery pack further includes a support plate disposed within the housing, and a second heating film disposed on the side of the support plate facing the plurality of battery cells, the support plate supporting the second heating film.

[0013] In some embodiments, the support plate has a plurality of second protrusions on the side facing the second heating film, each second protrusion corresponding to a heat-conducting protrusion, and each second protrusion abuts against the corresponding heat-conducting protrusion towards the battery cell.

[0014] In some embodiments, each cell is a cylindrical cell, and multiple cylindrical cells are arranged in parallel axial directions. The housing includes a first support and a second support. The first support and the second support are spliced ​​together along the axial direction of the cylindrical cells to form the housing, and multiple cells are disposed between the first support and the second support.

[0015] In one embodiment of this application, an energy storage device is also provided, including a housing and a battery pack as described in any of the above embodiments, wherein the battery pack is disposed within the housing.

[0016] The energy storage device provided in this application heats the busbar through a first heating film during use. The heat from the first heating film is transferred to the electrical connection ends of each battery cell through the busbar. The non-electrical connection ends of each battery cell are also heated by the thermally conductive protrusions of the second heating film, so that both ends of each battery cell can be heated, resulting in a more uniform temperature of the battery cells and reducing the temperature difference between the two ends of the battery cells. In addition, compared with the heating method of wrapping the battery cells with a serpentine heating band, the second heating film can directly contact the non-electrical connection ends of each battery cell in a roughly flat state, thus eliminating the drawbacks of the winding and tortuous assembly shape of the serpentine heating film, resulting in lower assembly costs. It only needs to directly contact and abut the non-electrical connection ends of each battery cell through the protrusions to work with the first heating film to achieve uniform heating of each battery cell, thus achieving reliable and uniform heating of CTC type battery cells with better cost advantages. Attached Figure Description

[0017] Figure 1 This is a perspective view of an energy storage device according to one embodiment of this application.

[0018] Figure 2 This is a perspective view of the internal structure of the battery pack in one embodiment of this application.

[0019] Figure 3 for Figure 2 An exploded view of the battery pack.

[0020] Figure 4 for Figure 3 A three-dimensional view of the second heating film.

[0021] Figure 5 for Figure 2 A partial cross-sectional view of the battery pack.

[0022] Figure 6 for Figure 5 A cross-sectional view of the second heating film and heating wire.

[0023] Figure 7 This is a cross-sectional view of the second heating film, support plate, and non-electrical connection end in another embodiment of this application.

[0024] Figure 8 for Figure 3 A three-dimensional view of the support plate in the middle.

[0025] Explanation of main component symbols

[0026] 100. Battery pack; 200. Energy storage device; 201. Housing; 10. Shell; 11. First bracket; 12. Second bracket; 20. Battery cell; 21. Electrical connection terminal; 22. Non-electrical connection terminal; 30. Busbar; 40. First heating film; 50. Second heating film; 51. Thermally conductive protrusion; 52. Through hole; 53. Heating wire; 54. Weight reduction hole; 55. Mounting hole; 56. First bulge; 60. Support plate; 61. Vent hole; 62. Weight reduction hole of support plate; 63. Mounting hole of support plate; 64. Second bulge; 70. Top plate. Detailed Implementation

[0027] The technical solution of this application will now be described with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments.

[0028] It should be noted that when an element is considered to be "connected to" or "located on" another element, it can be directly connected to the other element or may have an element centrally located. In this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "fixed," etc., should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. The terms "first," "second," etc., are only used to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary / secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified. The shape descriptions in the embodiments of this application are merely illustrative and should not constitute any absolute limitation on this application. The terms "vertical" and "parallel" are used to describe the ideal state between two components; in actual production or use, a state approximately vertical or parallel may exist.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. Where there is no conflict, the various embodiments in this application can be combined with each other.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The terms “comprising,” “having,” and “equipped with,” and any variations thereof, in the specification, claims, and foregoing drawings of this application, are intended to cover non-exclusive inclusion. The term “or / and” as used herein includes any and all combinations of one or more of the associated listed items.

[0031] CTC (Cell-to-Chassis) battery packs are gaining increasing attention in the industry due to their superior weight reduction and significant cost reduction advantages. The structural characteristics of CTC battery packs dictate that busbars are only located on one side.

[0032] In related technologies, the common practice is to directly heat the busbar to heat the battery cells. However, this results in only one end of the battery cell being heated, leading to insufficient heat uniformity. To improve uniformity, a serpentine heating band is usually wrapped around the outer wall of each battery cell. While this can achieve uniform heating of the battery cells, it also increases the overall volume of the battery pack due to the heating band wrapping around the cells, and the increased manufacturing cost due to the large amount of heating band used.

[0033] In view of this, this application provides a battery pack and energy storage device that can uniformly heat the battery cells while reducing size and cost. The battery pack includes a housing, multiple battery cells, multiple busbars, a first heating film, and a second heating film. Multiple battery cells are disposed within the housing, each cell having opposite electrical connection terminals and non-electrical connection terminals, with the positive and negative terminals of the cell located at the electrical connection terminals. Each busbar connects the electrical connection terminals of each battery cell, enabling series or parallel connection of the cells. The first heating film is attached to each busbar. The second heating film is disposed at the non-electrical connection terminals of the multiple battery cells, and the side of the second heating film facing the multiple battery cells has multiple thermally conductive protrusions, each thermally conductive protrusion being in close contact with the non-electrical connection terminal of a corresponding battery cell.

[0034] The battery pack provided in this application heats the busbar through a first heating film during use. The heat from the first heating film is transferred to the electrical connection ends of each cell through the busbar. The non-electrical connection ends of each cell are also heated through the thermally conductive protrusions of the second heating film, ensuring that both ends of each cell are heated. This results in a more uniform cell temperature and reduces the temperature difference between the two ends of the cell. Furthermore, compared to heating methods that involve wrapping the cells with a serpentine heating band, the second heating film can directly contact the non-electrical connection ends of each cell in a roughly flat state. This eliminates the drawbacks of the winding assembly shape of the serpentine heating film, resulting in lower assembly costs. The first heating film can work in conjunction with the protrusions to directly contact and press against the non-electrical connection ends of each cell, achieving uniform heating of each cell. This provides a more cost-effective and reliable uniform heating of CTC-type cells.

[0035] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] like Figure 1 and Figure 2 As shown in the embodiment of this application, an energy storage device 200 is provided. The energy storage device 200 includes a housing 201 and a battery pack 100. The battery pack 100 is disposed inside the housing 201, and the housing 201 is used to protect the battery pack 100. The energy storage device 200 can store electrical energy in the battery pack 100 and supply power to electrical appliances in scenarios where electrical energy is needed, such as outdoor scenarios or home scenarios. In home scenarios, the energy storage device 200 can be installed on balconies or other locations to be used in conjunction with solar panels installed outside the balcony railing or on the roof.

[0037] like Figure 2 and Figure 3 As shown, the battery pack 100 includes a housing 10, multiple battery cells 20, and multiple busbars 30. The multiple battery cells 20 are disposed within the housing 10, and each battery cell 20 has opposite electrical connection terminals 21 and non-electrical connection terminals 22. The positive and negative terminals of each battery cell 20 are located at the electrical connection terminals 21. Each busbar 30 connects to the electrical connection terminals 21 of each battery cell 20 to achieve series or parallel connection of the battery cells 20. For example, the battery pack 100 is a CTC (Cell-to-Chassis) type battery pack. CTC specifically refers to the technology of integrating the battery cells and housing in a single design. CTC technology can reduce the number of parts and improve space utilization.

[0038] like Figure 3 and Figure 4As shown, the battery pack 100 also includes a first heating film 40 and a second heating film 50. The first heating film 40 is attached to the side of each busbar 30 facing away from the battery cell 20. The first heating film 40 is used to heat each busbar 30, thereby heating the electrical connection terminals 21 of each battery cell 20 through the busbar 30. The second heating film 50 is disposed inside the housing 10 and on the non-electrical connection terminals 22 of the multiple battery cells 20. The side of the second heating film 50 facing the multiple battery cells 20 has multiple heat-conducting protrusions 51. Each heat-conducting protrusion 51 is in close contact with a corresponding non-electrical connection terminal 22 of the battery cell 20. That is, each heat-conducting protrusion 51 is in close contact with each non-electrical connection terminal 22 of the battery cell 20 in a one-to-one correspondence. The second heating film 50 is used to heat the non-electrical connection terminals 22 of the battery cell 20. For example, when the ambient temperature of the battery cell 20 is low, the first heating film 40 and the second heating film 50 heat the battery cell 20 so that the battery cell 20 can work normally.

[0039] When in use, the battery pack 100 provided in this application heats the busbar 30 through the first heating film 40. The heat from the first heating film 40 is transferred to the electrical connection terminals 21 of each cell 20 through the busbar 30. The heat is also contacted and heated to the non-electrical connection terminals 22 of each cell 20 through the heat-conducting protrusions 51 of the second heating film 50. This ensures that both ends of each cell 20 are heated, resulting in a more uniform temperature of the cell 20 and reducing the temperature difference between the two ends of the cell 20. In addition, compared with the heating method of wrapping the cell with a serpentine heating band, the second heating film 50 can be set more flat, thus occupying less space and using less material, thereby reducing the overall volume of the battery pack 100 and reducing the cost.

[0040] In some embodiments, such as Figures 3 to 5 As shown, the second heating film 50 has a through hole 52 on each heat-conducting protrusion 51, and each through hole 52 passes through the heat-conducting protrusion 51 and the opposite sides of the second heating film 50. The through hole 52 is used to avoid the explosion-proof valve (not shown) of the non-electrical connection end 22 of the battery cell 20. When an abnormal situation occurs inside the battery cell 20 (such as overcharging, over-discharging, short circuit, etc.), a large amount of gas is generated inside the battery cell 20 due to chemical reaction, causing the pressure to rise sharply. The explosion-proof valve will automatically open to release the high-pressure gas accumulated inside, preventing the battery cell 20 from rupturing or exploding due to excessive pressure. Since the heat-conducting protrusion 51 contacts the non-electrical connection end 22, the through hole 52 can prevent the heat-conducting protrusion 51 from blocking the explosion-proof valve, thereby improving the safety of the battery cell 20.

[0041] In some embodiments, such as Figure 5 and Figure 6 As shown, the second heating film 50 is provided with a heating wire 53. The heating wire 53 passes through each heat-conducting protrusion 51 in a preset path. When the heating wire 53 is energized, it can heat each heat-conducting protrusion 51, so that each heat-conducting protrusion 51 heats the corresponding non-electrical connection end 22.

[0042] Optionally, the heating wire 53 is arranged in a path that wraps around the through hole 52 in each heat-conducting protrusion 51 in multiple turns, so that the heating wire 53 in each heat-conducting protrusion 51 has sufficient length, thereby ensuring that each heat-conducting protrusion 51 can effectively heat the non-electrical connection end 22 of the battery cell 20 and improve the heating efficiency of the battery cell 20.

[0043] Optionally, the heating wire 53 is positioned in each heat-conducting protrusion 51 closer to the top of the heat-conducting protrusion 51 facing the cell 20, so that the heat of the heating wire 53 is transferred to the non-electrical connection end 22 of the cell 20 more efficiently, thereby improving the heating efficiency of the cell 20.

[0044] In some embodiments, such as Figure 3 and Figure 4 As shown, the second heating film 50 is provided with a plurality of weight reduction holes 54, which are distributed at various positions of the second heating film 50. For example, the weight reduction holes 54 can be located between several adjacent heat-conducting protrusions 51. The weight reduction holes 54 are used to reduce the weight of the second heating film 50, thereby reducing the weight of the battery pack 100 and the energy storage device 200.

[0045] In some embodiments, such as Figure 3 and Figure 4 As shown, the second heating film 50 is provided with a plurality of mounting holes 55, which are distributed at various positions on the second heating film 50. Each mounting hole 55 is used to align with the hole in the housing 10 for assembly of the second heating film 50 and the housing 10. Optionally, the second heating film 50 is fixed to the housing 10 by screws passing through the mounting holes 55.

[0046] In some embodiments, such as Figure 4 and Figure 5 As shown, the heat-conducting protrusion 51 is elastic. When the battery pack 100 is in use, each heat-conducting protrusion 51 is squeezed by the non-electrical connection end 22 of the corresponding cell 20. This makes the heat-conducting protrusion 51 abut against the non-electrical connection end 22, ensuring that the heat-conducting protrusion 51 effectively heats the non-electrical connection end 22. This avoids the formation of a gap between the heat-conducting protrusion 51 and the non-electrical connection end 22 due to the deformation of the second heating film 50, which would cause the heat-conducting protrusion 51 to fail to heat the non-electrical connection end 22.

[0047] Optionally, the thermally conductive protrusion 51 is columnar, and the height of the thermally conductive protrusion 51 relative to the second heating film 50 is greater than the gap width between the non-electrical connection end 22 and the second heating film 50, so that the thermally conductive protrusion 51 abuts against the non-electrical connection end 22.

[0048] In some embodiments, such as Figure 7As shown, the second heating film 50 has a corresponding first bulge 56 on the side of each heat-conducting protrusion 51 facing away from the battery cell 20. The first bulge 56 is used to lift the heat-conducting protrusion 51 toward the battery cell 20, so that the heat-conducting protrusion 51 abuts against the corresponding non-electrical connection end 22, ensuring that the heat-conducting protrusion 51 effectively heats the non-electrical connection end 22, and avoiding the formation of a gap between the heat-conducting protrusion 51 and the non-electrical connection end 22 due to the deformation of the second heating film 50, which would cause the heat-conducting protrusion 51 to fail to heat the non-electrical connection end 22.

[0049] Optionally, both the first protrusion 56 and the heat-conducting protrusion 51 are columnar, and the through hole 52 penetrates the opposite ends of the first protrusion 56 and the heat-conducting protrusion 51.

[0050] In some embodiments, such as Figure 3 , Figure 5 and Figure 8 As shown, the battery pack 100 also includes a support plate 60, which is disposed inside the housing 10. The support plate 60 is located on the side of the second heating film 50 facing away from the multiple battery cells 20. The support plate 60 is used to support the second heating film 50, that is, to provide a supporting force to the second heating film 50 towards the battery cells 20. In this way, the flatness of the second heating film 50 can be improved to reduce the risk of wrinkles or warping of the second heating film 50. It can also make the battery cells 20 and the support plate 60 clamp the heat-conducting protrusion 51, so that the heat-conducting protrusion 51 abuts against the non-electrical connection end 22, ensuring that the heat-conducting protrusion 51 effectively heats the non-electrical connection end 22. This avoids the formation of a gap between the heat-conducting protrusion 51 and the non-electrical connection end 22 due to the deformation of the second heating film 50, which would cause the heat-conducting protrusion 51 to fail to heat the non-electrical connection end 22.

[0051] Optionally, such as Figure 3 , Figure 5 and Figure 8 As shown, the support plate 60 is provided with multiple vent holes 61, which penetrate through the opposite sides of the support plate 60. Each vent hole 61 is aligned with a corresponding through hole 52. The corresponding vent holes 61 and through holes 52 are used to avoid the explosion-proof valve of the non-electrical connection end 22 of the battery cell 20, so that the explosion-proof valve can release the internal high-pressure gas. This can prevent the support plate 60 from blocking the explosion-proof valve, thereby improving the safety of the battery cell 20.

[0052] Optionally, such as Figure 8 As shown, the support plate 60 is provided with a plurality of support plate weight reduction holes 62, which are distributed at various positions of the support plate 60. For example, the support plate weight reduction holes 62 can be located between several adjacent vent holes 61. The support plate weight reduction holes 62 are used to reduce the weight of the support plate 60, thereby reducing the weight of the battery pack 100 and the energy storage device 200.

[0053] Optionally, such as Figure 3 and Figure 8As shown, the support plate 60 has multiple support plate mounting holes 63, which are distributed at various positions on the support plate 60. Each support plate mounting hole 63 is aligned with the mounting hole 55 of the second heating film 50 and the hole in the housing 10 to facilitate the assembly of the support plate 60, the second heating film 50, and the housing 10. Optionally, the support plate 60 and the second heating film 50 are fixed to the housing 10 by screws passing sequentially through the mounting holes 55 and 63.

[0054] In some embodiments, such as Figure 7 As shown, the support plate 60 has a plurality of second protrusions 64 on the side facing the second heating film 50. Each second protrusion 64 corresponds to a heat-conducting protrusion 51. Each second protrusion 64 is used to abut against the corresponding heat-conducting protrusion 51 towards the battery cell 10. The second protrusion 64 is used to lift the heat-conducting protrusion 51 towards the battery cell 20. In this way, the heat-conducting protrusion 51 abuts against the corresponding non-electrical connection end 22, ensuring that the heat-conducting protrusion 51 effectively heats the non-electrical connection end 22. This avoids the formation of a gap between the heat-conducting protrusion 51 and the non-electrical connection end 22 due to the deformation of the second heating film 50, which would cause the heat-conducting protrusion 51 to fail to heat the non-electrical connection end 22.

[0055] In some embodiments, such as Figure 2 , Figure 3 and Figure 5 As shown, each cell 20 is a cylindrical cell, and multiple cylindrical cells are arranged parallel to each other along their axial directions. The housing 10 includes a first bracket 11 and a second bracket 12. The first bracket 11 and the second bracket 12 are spliced ​​together along the axial direction of the cylindrical cells 20 to form the housing 10. Multiple cells 20 are fixed between the first bracket 11 and the second bracket 12. The support plate 60 and the second heating film 50 are located inside the second bracket 12. The electrical connection end 21 of each cell 20 is exposed from the first bracket 11. Multiple busbars 30 are located on the side of the first bracket 11 facing away from the second bracket 12. This facilitates the assembly of the battery pack 100.

[0056] In some embodiments, such as Figure 2 , Figure 3 and Figure 5 As shown, the battery pack 100 also includes a top plate 70, which is disposed on the side of the first heating film 40 facing away from the busbar 30. The top plate 70 is used to support the first heating film 40, that is, to provide a supporting force to the first heating film 40 toward the busbar 30. In this way, the flatness of the first heating film 40 can be improved, thereby reducing the risk of the first heating film 40 wrinkling or warping, ensuring that the first heating film 40 effectively heats the busbar 30, and avoiding the formation of a gap between the busbar 30 and the non-electrical connection terminal 22 due to deformation, thereby reducing the risk of the first heating film 40 failing to heat the busbar 30.

[0057] In some embodiments, the first heating film 40 may also have a protrusion (not shown) for heat conduction on the side facing the busbar 30. The protrusion of the first heating film 40 is in close contact with the busbar 30 to effectively heat the busbar 30. Optionally, the protrusion of the first heating film 40 is in close contact with the electrical connection between the busbar 30 and the electrical connection terminal 21 to shorten the distance between the first heating film 40 and the electrical connection terminal 21, so that the heat of the first heating film 40 can be transferred to the electrical connection terminal 21 more efficiently, thereby improving the heating efficiency. Alternatively, the top plate 70 may also have a protrusion at the position corresponding to the protrusion of the first heating film 40 to abut against the protrusion of the first heating film 40, thereby making the protrusion of the first heating film 40 in close contact with the busbar 30 and improving the heating efficiency.

[0058] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.

Claims

1. A battery pack, characterized in that, include: case; Multiple battery cells are disposed within the housing, each battery cell having opposite electrical connection terminals and non-electrical connection terminals, with the positive and negative terminals of the battery cell located at the electrical connection terminals; Multiple busbars, each of which connects to the electrical connection terminal of each of the battery cells to realize the series or parallel connection of the battery cells; A first heating film is attached to each of the aforementioned busbars; and A second heating film is disposed on the non-electrical connection end of the plurality of battery cells. The second heating film has a plurality of thermally conductive protrusions on one side facing the plurality of battery cells, and each thermally conductive protrusion is in close contact with a corresponding non-electrical connection end of the battery cell.

2. The battery pack as described in claim 1, characterized in that: The second heating film has a through hole in each of the heat-conducting protrusions, and each through hole passes through the heat-conducting protrusion and the opposite sides of the second heating film.

3. The battery pack as described in claim 1, characterized in that: The second heating film is provided with a heating wire, which passes through each of the heat-conducting protrusions in a preset path. The heating wire heats each of the heat-conducting protrusions, so that each heat-conducting protrusion heats the corresponding battery cell.

4. The battery pack as described in claim 1, characterized in that: The second heating film is provided with multiple weight reduction holes and / or multiple mounting holes.

5. The battery pack as described in claim 1, characterized in that: The thermally conductive protrusions are elastic, and each thermally conductive protrusion is squeezed by the corresponding battery cell.

6. The battery pack as described in claim 1, characterized in that: The second heating film has a corresponding first protrusion on the side of each heat-conducting protrusion away from the battery cell, and each first protrusion abuts against the corresponding heat-conducting protrusion toward the battery cell.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The battery pack also includes a support plate disposed inside the housing, and the second heating film is disposed on the side of the support plate facing the plurality of battery cells, and the support plate supports the second heating film.

8. The battery pack as described in claim 7, characterized in that: The support plate has a plurality of second protrusions on the side facing the second heating film, each second protrusion corresponding to a heat-conducting protrusion, and each second protrusion abuts against the corresponding heat-conducting protrusion toward the battery cell.

9. The battery pack according to any one of claims 1 to 6, characterized in that: Each of the battery cells is a cylindrical battery cell, and the axial directions of the plurality of cylindrical battery cells are arranged in parallel. The housing includes a first bracket and a second bracket. The first bracket and the second bracket are spliced ​​together along the axial direction of the cylindrical battery cells to form the housing, and the plurality of battery cells are disposed between the first bracket and the second bracket.

10. An energy storage device, characterized in that: The energy storage device includes a housing and a battery pack as described in any one of claims 1 to 9, wherein the battery pack is disposed within the housing.

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