Battery pack and energy storage device

Abstract

The utility model relates to the technical field of energy storage, in particular to a battery pack and energy storage equipment, the battery pack comprises a battery cell group, a metal end plate, a heating film and an insulating sheet, and the battery cell group is provided with a first side and a second side which are adjacent; the metal end plate is located on the first side; the heating film is positioned on the second side and is attached to the battery cell group; the insulation sheet is located on the first side and located between the battery cell group and the metal end plate, the insulation sheet comprises a main body part and an edge part, the main body part covers the face, facing the battery cell group, of the metal end plate, and the edge part is connected to the peripheral edge of the main body part and is bent in the direction away from the battery cell group so as to wrap the peripheral edge of the metal end plate. According to the arrangement, the service life, safety and reliability of the energy storage equipment can be improved.

Description

Technical Field

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

[0002] A battery pack consists of multiple battery cells arranged in a cell assembly. End plates are located on both sides of the cell assembly, serving to limit the cell assembly's position. To ensure the structural strength of the end plates, they are typically made of metal. Due to the conductivity of metal end plates, in related technologies, an insulating sheet is usually placed between the metal end plate and the cell for insulation. This insulating sheet is attached to the periphery of the cell to increase the reliability of the insulation between the metal end plate and the cell. An additional heating film is attached to the side of the cell assembly adjacent to the metal end plate. Part of the insulating sheet is located between the heating film and the cell, causing a localized increase in the height of the heating film, resulting in unevenness. This prevents some parts of the heating film from contacting the cell, leading to less heat transfer to the cell from the non-contact areas during operation. Therefore, the heating film needs to be heated to ensure that the non-contact areas can meet the heating requirements of the cell. However, as the temperature of the heating film continues to rise, it can damage the heating film, resulting in a shorter lifespan and poorer safety and reliability of the energy storage device. Utility Model Content

[0003] In view of this, this application provides a battery pack and an energy storage device that can improve the service life, safety and reliability of the energy storage device.

[0004] On one hand, embodiments of this application provide a battery pack, which includes a cell assembly, a metal end plate, a heating film, and an insulating sheet. The cell assembly has an adjacent first side and a second side; the metal end plate is located on the first side; the heating film is located on the second side and is attached to the cell assembly; the insulating sheet is located on the first side and is located between the cell assembly and the metal end plate. The insulating sheet includes a main body and an edge portion. The main body covers the side of the metal end plate facing the cell assembly, and the edge portion is connected to the peripheral edge of the main body and bent in a direction away from the cell assembly to wrap the peripheral edge of the metal end plate.

[0005] By setting the edge of the insulating sheet to bend away from the cell assembly, the edge does not extend between the cell assembly and the heating film, thereby improving the flatness of the heating film. This improves the bonding effect between the heating film and the cell assembly, as well as the heat transfer effect between the heating film and the cell assembly at various points. It also improves the problem that the heating film is easily damaged when the temperature is continuously raised, thus improving the service life, safety and reliability of the battery pack and energy storage equipment.

[0006] In at least one embodiment, the edge portion has a first segment and a second segment, the first segment being connected to the main body portion, the second segment being connected to the end of the first segment away from the main body portion, the first segment wrapping around the peripheral edge of the metal end plate, and the second segment being attached to the side of the metal end plate away from the cell assembly.

[0007] By designating the edge portion as a first segment and a second segment, the coverage area of ​​the edge portion covering the metal end plate is increased, thereby increasing the insulation area and improving the insulation effect of the edge portion on the edge of the metal end plate. Furthermore, the second segment is attached to the side of the metal end plate away from the cell assembly, ensuring that the edge of the metal end plate is fully wrapped by the insulating sheet, improving the insulation reliability between the cell assembly and the metal end plate. The side of the metal end plate away from the cell assembly also has sufficient area to attach the second segment, facilitating the attachment of the insulating sheet and improving the reliability of the connection between the metal end plate and the insulating sheet.

[0008] In at least one embodiment, a protrusion is provided on the side of the metal end plate away from the main body, the protrusion is close to the edge of the metal end plate, and the edge covers the protrusion.

[0009] On the one hand, by setting protrusions on the metal end plate, the local thickness of the metal end plate can be increased, so that the protrusions can play a role in strengthening the structure of the metal end plate; on the other hand, the edge portion covering the protrusions can increase the coverage area between the edge portion and the metal end plate, which facilitates the attachment of the insulating sheet and improves the reliability of the connection between the metal end plate and the insulating sheet.

[0010] In at least one embodiment, the protrusion has a contact surface that gradually moves away from the main body in a direction away from the peripheral edge, and the edge portion is attached to the contact surface.

[0011] As the bonding surface gradually moves away from the main body along the direction away from the peripheral edge, the distance between the bonding surface and the electrodes of the battery cell gradually increases, making the bonding surface tilted. This reduces the angle when the insulating sheet is attached to the bonding surface, avoids the problem of unreliable attachment due to excessive angle, and improves the reliability of the insulating sheet attachment.

[0012] In at least one embodiment, the side of the metal end plate facing away from the cell assembly is provided with two spaced-apart limiting ribs, and two protrusions are provided. The two protrusions are respectively close to the edges of opposite sides of the metal end plate, and the two limiting ribs are located between the two protrusions. Each protrusion and the adjacent limiting rib form a limiting groove. The battery pack also includes two straps. There are two metal end plates, which are arranged opposite each other. The cell assembly is located between the two metal end plates. An insulating sheet is provided between each metal end plate and the cell assembly. Each strap is arranged around the cell assembly and the two metal end plates. A portion of one strap is confined within a corresponding limiting groove to bundle the cell assembly and the two metal end plates.

[0013] By binding the metal end plate and the battery cell assembly with straps, the positions of the battery cell assembly, metal end plate, and insulating sheet are restricted, thereby fixing the battery cell assembly, metal end plate, and insulating sheet and improving the structural stability between the battery cell assembly, metal end plate, and insulating sheet. In addition, the position limit of the straps by the limiting groove can improve the problem of the straps easily detaching from the metal end plate, thereby improving the stability of the straps binding the battery cell assembly, metal end plate, and insulating sheet. Furthermore, by setting two protrusions and two limiting ribs, the local thickness of the metal end plate can be increased, thereby increasing the structural strength of the metal end plate.

[0014] In at least one embodiment, the edge portion includes a plurality of insulating segments connected sequentially along the circumference of the main body portion; wherein, a first curved segment connects two adjacent insulating segments to make the two adjacent insulating segments transition smoothly.

[0015] By insulating each edge of the metal end plate in the circumferential direction with multiple insulating segments, the coverage area of ​​the edge portion on the metal end plate is increased, thereby improving the insulation effect of the edge portion on the metal end plate; in addition, two adjacent insulating segments are smoothly transitioned by the first curved segment to improve the problem that sharp edges between adjacent insulating segments can easily scratch other components inside the mounting housing.

[0016] In at least one embodiment, the main body and the edge are connected by a second curved segment to make the main body and the edge transition smoothly.

[0017] The second curved section allows for a smooth transition between the main body and the edge section. This addresses the issue of sharp edges between the two insulating sections potentially scratching other components inside the mounting housing.

[0018] In at least one embodiment, the edge portion and the main body portion form an insulating space for accommodating the metal end plate. The side of the edge portion away from the electrode of the battery cell assembly is provided with a clearance opening, which communicates with the insulating space so that the metal end plate can enter the insulating space through the clearance opening.

[0019] By providing a clearance opening, the side area of ​​the metal end plate is reduced, allowing one side of the metal end plate to pass through the clearance opening first. The sides of the metal end plate located on either side of the clearance opening are positioned inside the corresponding edges and engage with those edges. Then, the metal end plate gradually slides into the insulation space until the edge opposite the clearance opening abuts against one side of the metal end plate, completing the assembly of the metal end plate and the insulating sheet. It is evident that by allowing one side of the metal end plate to pass through the clearance opening first, the other sides of the metal end plate are simultaneously positioned inside the corresponding edges and engage with them. This eliminates the need to separately position multiple sides of the metal end plate, facilitating its entry into the insulation space and improving the assembly efficiency of the insulating sheet and the metal end plate.

[0020] In at least one embodiment, the side of the main body facing the metal end plate is provided with an adhesive area, and the main body is attached to the metal end plate through the adhesive area.

[0021] By bonding the main body and the metal end plate, the positions of the main body and the metal end plate are relatively fixed, thereby improving the connection stability between the main body and the metal end plate.

[0022] On the other hand, embodiments of this application provide an energy storage device, which includes: a mounting housing and the aforementioned battery pack; the battery pack is disposed within the mounting housing.

[0023] By applying the aforementioned battery pack to energy storage devices, the energy storage devices are equipped with both energy storage and discharge functions. Furthermore, the insulation sheet on the battery pack enhances the insulation performance of the metal end plates and cell groups, thereby improving the lifespan, safety, and reliability of the battery pack and energy storage devices, and ultimately enhancing the lifespan, safety, and reliability of the energy storage devices. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope.

[0025] Figure 1 This is a perspective view of an energy storage device provided in an embodiment of this application;

[0026] Figure 2 An exploded view of an energy storage device provided in an embodiment of this application;

[0027] Figure 3 A first-view perspective perspective of a battery pack provided in an embodiment of this application;

[0028] Figure 4 A second perspective perspective view of a battery pack provided in an embodiment of this application;

[0029] Figure 5 This is a first-view structural schematic diagram of the fit between the metal end plate and the insulating sheet of a battery pack provided in an embodiment of this application;

[0030] Figure 6 An exploded view of the metal end plate and insulating sheet of a battery pack provided in an embodiment of this application;

[0031] Figure 7 This is a second-view structural schematic diagram of the cooperation between the metal end plate and the insulating sheet of the battery pack provided in an embodiment of this application;

[0032] Figure 8This is a schematic diagram of the structure of the edge portion of the insulating sheet of the battery pack in the first embodiment of this application;

[0033] Figure 9 This is a schematic diagram of the structure of the edge portion of the insulating sheet of the battery pack according to the present application in a second embodiment;

[0034] Figure 10 This is a schematic diagram of the third embodiment of the insulating sheet edge portion of the battery pack of this application.

[0035] Explanation of main component symbols

[0036] 100. Battery pack; 200. Energy storage device; 300. Mounting housing;

[0037] 10. Battery cell assembly; 110. First side; 120. Second side; 11. Battery cell; 111. Electrode;

[0038] 20. Metal end plate; 21. Protrusion; 210. Limiting groove; 211. Fitting surface; 22. Limiting rib; 23. Reinforcing rib;

[0039] 30. Heating film;

[0040] 40. Insulating sheet; 41. Main body; 410. Insulating space; 411. Second curved section; 412. Clearance opening; 413. Adhesive area; 42. Edge; 420. Insulating section; 421. First section; 422. Second section; 423. Third section; 424. First curved section;

[0041] 50. Straps. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0043] 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. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0044] Energy storage devices include battery packs, which consist of battery cell assemblies composed of multiple battery cells. End plates are located on both sides of the battery cell assembly, serving to fix and limit the battery cell assembly. To ensure the structural strength of the end plates, they are typically made of metal. Due to the conductivity of the metal end plates, insulating sheets are usually required to insulate the battery cells and the metal end plates. Multiple insulating sheets are used; one is sandwiched between the battery cell and the metal end plate surface facing the battery cell, while the remaining insulating sheets are attached to the periphery of the battery cell to achieve insulation between the periphery of the battery cell and the periphery of the metal end plate, thereby increasing the reliability of the insulation between the metal end plate and the battery cell. An additional thermal film is attached to the side of the battery cell assembly adjacent to the metal end plate, and insulating sheets are located on the periphery of the battery cell to... The insulating sheet is located between the heating film and the battery cell, which causes the local height of the heating film to increase and the heating film to become uneven. In addition, some parts of the heating film cannot contact the battery cell. As a result, when the heating film is working, less heat is transferred to the battery cell from the parts of the heating film that are not in direct contact with the battery cell. Therefore, the heating film needs to be heated so that the parts of the heating film that are not in direct contact with the battery cell can meet the heating requirements of the battery cell. However, as the temperature of the heating film continues to rise, it will cause damage to the heating film, which in turn leads to a shorter service life of the energy storage device and poor safety and reliability.

[0045] An embodiment of this application provides a battery pack, which includes a battery cell assembly, a metal end plate, a heating film, and an insulating sheet. The battery cell assembly has an adjacent first side and a second side; the metal end plate is located on the first side; the heating film is located on the second side and is attached to the battery cell assembly; the insulating sheet is located on the first side and is located between the battery cell assembly and the metal end plate. The insulating sheet includes a main body portion and an edge portion. The main body portion covers the side of the metal end plate facing the battery cell assembly, and the edge portion is connected to the peripheral edge of the main body portion and bent in a direction away from the battery cell assembly to wrap the peripheral edge of the metal end plate.

[0046] By setting the edge of the insulating sheet to bend away from the cell assembly, the edge does not extend between the cell assembly and the heating film, thereby improving the flatness of the heating film. This improves the bonding effect between the heating film and the cell assembly, as well as the heat transfer effect between the heating film and the cell assembly at various points. It also improves the problem that the heating film is easily damaged when the temperature is continuously raised, thus improving the service life, safety and reliability of the battery pack and energy storage equipment.

[0047] 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.

[0048] Please see Figure 1 and Figure 2 The embodiments of this application provide a battery pack 100 and an energy storage device 200.

[0049] The energy storage device 200 includes a battery pack 100 and a mounting housing 300, with the battery pack 100 housed within the mounting housing 300.

[0050] In some embodiments, the battery pack 100 includes a cell assembly 10 for storing electrical energy. Because the energy storage device 200 includes the battery pack 100, it possesses both energy storage and discharge functions for use as backup power for homes, production facilities, outdoor work, and outdoor recreation. The cell assembly 10 includes multiple cells 11 to ensure the battery capacity of the cell assembly 10.

[0051] In some embodiments, the energy storage device 200 includes a power conversion module (not shown). The power conversion module is electrically connected to the battery cell assembly 10 and is used to control the AC / DC conversion of the output current of the battery cell assembly 10. The energy storage device equipped with the power conversion module can be a small portable power supply, a residential energy storage power supply, an industrial or commercial energy storage power supply, or a containerized energy storage power supply, etc.

[0052] In some embodiments, the power conversion module may be omitted. The energy storage device 200 without a power conversion module can be used independently. The energy storage device 200 without a power conversion module typically only outputs DC power. When used independently, the energy storage device 200 without a power conversion module can be used in conjunction with an energy storage device that has a power conversion module to provide additional battery capacity as a power system.

[0053] Please see Figure 3 and Figure 4 In some embodiments, the cell assembly 10 has adjacent first sides 110 and second sides 120. The battery pack 100 includes a metal end plate 20, a heating film 30, and an insulating sheet 40. The metal end plate 20 is located on the first side 110; the heating film 30 is located on the second side 120 and is attached to the cell assembly 10; the insulating sheet 40 is located on the first side 110 and is situated between the cell assembly 10 and the metal end plate 20. In low-temperature environments, the cell assembly 10 is heated by the heating film 30 to ensure the performance of the cell assembly 10 in low-temperature environments.

[0054] Please see Figure 5 and Figure 6 The insulating sheet 40 includes a main body portion 41 and an edge portion 42. The main body portion 41 covers the side of the metal end plate 20 facing the cell assembly 10. The edge portion 42 is connected to the peripheral edge of the main body portion 41 and is bent away from the cell assembly 10 to wrap around the peripheral edge of the metal end plate 20. Here, "bent" is intended to indicate the relative positional relationship of the edge portion 42 with respect to the main body portion 41, and is not used to limit the forming method of the edge portion 42 relative to the main body portion 41.

[0055] By setting the edge portion 42 of the insulating sheet 40 to be bent away from the cell assembly 10, the edge portion 42 will not extend between the cell assembly 10 and the heating film 30, thereby improving the flatness of the heating film 30. This improves the bonding effect between the heating film 30 and the cell assembly 10, as well as the heat transfer effect between various positions of the heating film 30 and the cell assembly 10. It also improves the problem that the heating film 30 is prone to damage when the temperature is continuously increased, thus improving the service life, safety and reliability of the battery pack 100 and the energy storage device 200.

[0056] In some embodiments, the edge portion 42 and the main body portion 41 are integrally formed. For example, the edge portion 42 and the main body portion 41 are formed by bending an insulating sheet; or, the edge portion 42 and the main body portion 41 are formed into an integral structure by injection molding; or, the edge portion 42 and the main body portion 41 are formed into an integral structure by welding.

[0057] By making the edge portion 42 and the main body portion 41 an integrally formed structure, the integrally formed structure has no physical interruption, which can improve the structural strength of the edge portion 42 and the main body portion 41. Furthermore, when the insulating sheet 40 is placed on the metal end plate 20, the edge portion 42 and the main body portion 41 do not need to be operated separately, reducing the steps of placing the insulating sheet 40 on the metal end plate 20, thereby improving the assembly efficiency of the battery pack 100.

[0058] Please see Figure 6 In some embodiments, the edge portion 42 and the main body portion 41 form an insulating space 410 for accommodating the metal end plate 20. The edge portion 42 is provided with a clearance opening 412 on the side away from the electrode 111 of the battery cell assembly 10. The clearance opening 412 communicates with the insulating space 410 so that the metal end plate 20 can enter the insulating space 410 through the clearance opening 412.

[0059] Understandably, the side of the metal end plate 20 facing the cell assembly 10 is the front side, and the plane containing the peripheral edge of the metal end plate 20 is the side side. Multiple side sides are arranged sequentially around the front side. If the front side of the metal end plate 20 is directly inserted into the insulation space 410 from the side opposite to the main body 41, due to the large area of ​​the front side of the metal end plate 20 and the arrangement of multiple side sides around the front side, each side side needs to be pressed to the inner side of the corresponding edge portion 42, thereby affecting the assembly efficiency of the metal end plate 20 and the insulation sheet 40.

[0060] This application, by providing a clearance opening 412, allows the side surface area of ​​the metal end plate 20 to be relatively small, enabling one side of the metal end plate 20 to pass through the clearance opening 412 first. This facilitates the positioning of the metal end plate 20. The sides of the metal end plate 20 located on both sides of the clearance opening 412 are respectively located inside the corresponding edge portion 42 and are limited and engaged with the corresponding edge portion 42. Then, the metal end plate 20 gradually slides into the insulation space 410 until the edge portion 42 opposite to the clearance opening 412 abuts against one side of the metal end plate 20, completing the assembly of the metal end plate 20 and the insulating sheet 40. It can be seen that by allowing one side of the metal end plate 20 to pass through the clearance opening 412 first, the other sides of the metal end plate 20 are simultaneously located inside the corresponding edge portion 42 and engaged with the corresponding edge portion 42. This eliminates the need to position multiple sides of the metal end plate 20 separately, thus facilitating the entry of the metal end plate 20 into the insulation space 410 and improving the assembly efficiency of the insulating sheet 40 and the metal end plate 20.

[0061] In some embodiments, the insulating sheet 40 can be configured as an elastic structure. After the edge portion 42 and the main body portion 41 are formed and a preset angle is established, a certain force can be applied to the edge portion 42 to change the angle between the edge portion 42 and the main body portion 41. The edge portion 42 can then return to the position of the preset angle through its own elastic force. Thus, when the metal end plate 20 is placed into the insulating space 410, a certain force can be applied to the edge portion 42 to open the clearance opening 412, making the clearance opening 412 larger. This facilitates the metal end plate 20 entering the insulating space 410 through the clearance opening 412. After the metal end plate 20 enters the insulating space 410, the edge portion 42 returns to the position of the preset angle. The preset angle can be 90° or other angles, and the specific value of the preset angle can be selected according to the actual situation.

[0062] For example, the insulating sheet 40 is a PC sheet (Polycarbonate). The PC sheet has good insulation effect to achieve insulation between the metal end plate 20 and the battery cell assembly 10. In addition, the PC sheet has a certain elasticity so that by changing the included angle between the edge portion 42 and the main body portion 41, the metal end plate 20 can easily enter the insulation space 410. After the metal end plate 20 enters the insulation space 410, the edge portion 42 and the main body portion 41 return to their original state.

[0063] In some embodiments, the bottom of the mounting housing 300 is provided with a mounting groove (not shown), and the metal end plate 20 is fixedly installed in the mounting groove so that the metal end plate and the mounting housing 300 are relatively fixed, thereby achieving the fixation and positioning of the battery cell assembly 10.

[0064] In some embodiments, two metal end plates 20 are provided, which are arranged opposite to each other. The battery cell assembly 10 is disposed between the two metal end plates 20, and an insulating sheet 40 is provided between each metal end plate 20 and the battery cell assembly 10. By clamping the two metal end plates 20 on both sides of the battery cell assembly 10, the stability of the metal end plates 20 in fixing the battery cell assembly 10 is improved.

[0065] Please see Figure 3 , Figure 6 and Figure 7 In some embodiments, the edge of the metal end plate 20 away from the electrode extends out through a clearance opening 412 so that the metal end plate 20 can be connected to the bottom of the mounting housing 300.

[0066] The mounting shell 300 is designed as an insulating shell, which can insulate the edge of the metal end plate 20 away from the electrode 111. Furthermore, the electrode 111 of the battery cell 11 has strong conductivity. In this application, the distance between the edge of the metal end plate 20 connected to the mounting shell 300 and the electrode 111 is relatively far, and the conductivity of the battery cell 11 and the metal end plate 20 is relatively weak. Therefore, even if the body part 41 has an avoidance opening 412 on the edge away from the electrode 111, the insulation effect of the insulating sheet 40 and the battery cell 11 can be guaranteed.

[0067] Please see Figure 8 and Figure 9 In some embodiments, the edge portion 42 has a first segment 421 and a second segment 422. The first segment 421 is connected to the main body portion 41, and the second segment 422 is connected to the end of the first segment 421 away from the main body portion 41. The first segment 421 covers the peripheral edge of the metal end plate 20, and the second segment 422 is attached to the side of the metal end plate 20 away from the cell assembly 10. By setting the edge portion 42 as a first segment 421 and a second segment 422, the coverage area of ​​the edge portion 42 covering the metal end plate 20 is increased, thereby increasing the insulation area and improving the insulation effect of the edge portion 42 on the edge of the metal end plate 20.

[0068] Furthermore, the second segment 422 is attached to the side of the metal end plate 20 away from the cell assembly 10, which can ensure that the edge of the metal end plate 20 can be fully wrapped by the insulating sheet 40, thereby improving the insulation reliability between the cell assembly 10 and the metal end plate 20. In addition, the side of the metal end plate 20 away from the cell assembly 10 has enough area to attach the second segment 422, which facilitates the attachment of the insulating sheet 40 and improves the reliability of the connection between the metal end plate 20 and the insulating sheet 40.

[0069] The first segment 421 and the second segment 422 are integrally formed structures. For example, the first segment 421 and the second segment 422 are bent into an integrally formed structure. The integrally formed structure has no physical interruption, which can improve the structural strength between the first segment 421 and the second segment 422.

[0070] Please see Figure 5 and Figure 6 In some embodiments, the metal end plate 20 has a protrusion 21 on the side opposite to the main body 41. The protrusion 21 is located near the edge of the metal end plate 20, and the edge portion 42 covers the protrusion 21.

[0071] On the one hand, by providing a protrusion 21 on the metal end plate 20, the local thickness of the metal end plate 20 can be increased, so that the protrusion 21 can play a role in strengthening the structure of the metal end plate 20; on the other hand, the edge portion 42 covers the protrusion 21, which can increase the coverage area between the edge portion 42 and the metal end plate 20, making it easier to attach the insulating sheet 40 while improving the reliability of the connection between the metal end plate 20 and the insulating sheet 40.

[0072] Please see Figure 5 and Figure 6 In some embodiments, the protrusion 21 has a contact surface 211, which gradually moves away from the main body 41 in a direction away from the peripheral edge, and the edge portion 42 is attached to the contact surface 211.

[0073] As the bonding surface 211 gradually moves away from the main body 41 in a direction away from the peripheral edge, the bonding surface 211 is tilted, thereby reducing the angle when the insulating sheet 40 is attached to the bonding surface and avoiding the problem of unreliable attachment due to the large angle when the insulating sheet 40 is attached.

[0074] Please see Figure 5 and Figure 9 For example, the second segment 422 and the first segment 421 are set at an obtuse angle so that the second segment 422 is attached to the bonding surface 211, thereby increasing the coverage area of ​​the edge portion 42 and the metal end plate 20 and improving the coverage effect.

[0075] Please see Figure 5 and Figure 10 In some embodiments, the edge portion 42 further includes a third segment 423, which is connected to the second segment 422 and set at an angle. The third segment 423 is attached to the side of the protrusion 21 away from the first segment 421 and is limited to the side of the protrusion 21 away from the first segment 421, so that the positions of the insulating sheet 40 and the metal end plate 20 are relatively fixed, thereby improving the problem that the metal end plate 20 and the insulating sheet 40 are prone to relative movement and thus improving the reliability of the connection between the metal end plate 20 and the insulating sheet 40.

[0076] Among them, the second segment 422 and the third segment 423 are integrally formed structures. For example, the second segment 422 and the third segment 423 are bent into an integrally formed structure. The integrally formed structure has no physical interruption, which can improve the structural strength between the second segment 422 and the third segment 423.

[0077] In some embodiments, a first transition section (not shown) is provided between the first segment 421 and the second segment 422. The first transition section is arc-shaped to make the first segment 421 and the second segment 422 transition smoothly, thereby improving the problem that the sharp edge between the first segment 421 and the second segment 422 can easily damage other components in the mounting housing 300.

[0078] In some embodiments, a second transition section (not shown) is provided between the second segment 422 and the third segment 423. The second transition section is arc-shaped to make the second segment 422 and the third segment 423 transition smoothly, thereby improving the problem that the sharp edge between the second segment 422 and the third segment 423 can easily damage other components in the mounting housing 300.

[0079] Please see Figure 4 and Figure 5 In some embodiments, the metal end plate 20 has two spaced-apart limiting ribs 22 on the side facing away from the cell assembly 10, and two protrusions 21 are provided. The two protrusions 21 are respectively close to the edges of opposite sides of the metal end plate 20, and the two limiting ribs 22 are located between the two protrusions 21. Each protrusion 21 and the adjacent limiting rib 22 form a limiting groove 210. The battery pack 100 also includes two straps 50. Each strap 50 is arranged around the cell assembly 10 and the two metal end plates 20. A portion of one strap 50 is limited within a corresponding limiting groove 210 to bundle the cell assembly 10 and the two metal end plates 20.

[0080] By binding the metal end plate 20 and the battery cell assembly 10 with strap 50, the positions of the battery cell assembly 10, the metal end plate 20, and the insulating sheet 40 are restricted, thereby fixing the battery cell assembly 10, the metal end plate 20, and the insulating sheet 40 and improving the structural stability between the battery cell assembly 10, the metal end plate 20, and the insulating sheet 40. Furthermore, by limiting the position of the strap 50 through the limiting groove 210, the problem of the strap 50 easily detaching from the metal end plate 20 can be improved, thereby enhancing the stability of the binding of the battery cell assembly 10, the metal end plate 20, and the insulating sheet 40 with strap 50. In addition, by setting two protrusions 21 and two limiting ribs 22, the local thickness of the metal end plate 20 can be increased, thereby increasing the structural strength of the metal end plate 20.

[0081] Please see Figure 5 , Figure 6 and Figure 7 In some embodiments, the metal end plate 20 is provided with reinforcing ribs 23, which are connected to two limiting ribs 22. The local thickness of the metal end plate 20 can be increased by the reinforcing ribs 23, thereby improving the structural strength of the metal end plate 20.

[0082] In some embodiments, the reinforcing ribs 23 are configured as a mesh structure to increase the structural strength of the metal end plate 20.

[0083] In some embodiments, the reinforcing rib 23, the limiting rib 22, and the protrusion 21 are all integrally formed with the main body of the metal end plate 20, and the integrally formed structure has no physical interruption, thereby further enhancing the structural strength of the metal end plate 20.

[0084] Please see Figure 5 and Figure 6 In some embodiments, the edge portion 42 includes a plurality of insulating segments 420, which are connected sequentially along the circumference of the main body portion 41, so as to insulate each edge of the metal end plate 20 in the circumferential direction through the plurality of insulating segments 420, thereby increasing the coverage area of ​​the edge portion 42 on the metal end plate 20 and thus improving the insulation effect of the edge portion 42 on the metal end plate 20.

[0085] Please refer to Figure 5 and Figure 6 A first curved section 424 connects two adjacent insulating sections 420 to make the two adjacent insulating sections 420 transition smoothly, thereby improving the problem that the sharp edges between the two adjacent insulating sections 420 can easily scratch other components inside the mounting housing 300.

[0086] Please see Figure 6 In some embodiments, the main body 41 and the edge portion 42 are joined by a second curved segment 411 to allow for a smooth transition between the main body 41 and the edge portion 42. This mitigates the problem of sharp edges between the two insulating segments 420 easily scratching other components within the mounting housing 300.

[0087] Please see Figure 6 In some embodiments, the side of the main body 41 facing the metal end plate 20 is provided with an adhesive area 413, and the main body 41 is bonded to the metal end plate 20 through the adhesive area 413. By bonding the main body 41 and the metal end plate 20, the positions of the main body 41 and the metal end plate 20 are relatively fixed, thereby improving the connection stability between the main body 41 and the metal end plate 20.

[0088] Understandably, adhesive area 413 is provided with glue or double-sided tape to achieve bonding between the main body 41 and the metal end plate 20.

[0089] In some embodiments, the edge portion 42 is also provided with an adhesive area so that the edge portion 42 is bonded to the peripheral edge of the metal end plate 20, thereby further improving the stability of the connection between the insulating sheet 40 and the metal end plate 20 and improving the problem that the insulating sheet 40 and the metal end plate 20 are easy to separate.

[0090] In some embodiments, the battery pack 100 further includes an elastic pad (not shown) disposed on the side of the main body 41 opposite to the metal end plate 20 and configured to contact the battery cells. By providing the elastic pad, the elastic force of the elastic pad can be used to absorb the expansion of the battery cell assembly 10, thereby improving the problem that the metal end plate 20 is directly subjected to the expansion force of the battery cell assembly 10, causing the metal end plate 20 to be subjected to concentrated stress and thus deformed.

[0091] For example, the elastic pad is a silicone pad or a rubber pad. The silicone pad or rubber pad has good elasticity to absorb the expansion of the cell assembly 10.

[0092] 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, The battery pack includes: A battery cell assembly having an adjacent first side and a second side; A metal end plate is located on the first side; A heating film is located on the second side and is attached to the battery cell assembly; An insulating sheet is located on the first side and between the battery cell assembly and the metal end plate. The insulating sheet includes a main body and an edge portion. The main body covers the side of the metal end plate facing the battery cell assembly. The edge portion is connected to the peripheral edge of the main body and is bent away from the battery cell assembly to wrap around the peripheral edge of the metal end plate.

2. The battery pack according to claim 1, characterized in that, The edge portion has a first segment and a second segment. The first segment is connected to the main body portion, and the second segment is connected to the end of the first segment away from the main body portion. The first segment wraps around the peripheral edge of the metal end plate, and the second segment is attached to the side of the metal end plate away from the cell assembly.

3. The battery pack according to claim 1, characterized in that, The metal end plate has a protrusion on the side opposite to the main body, the protrusion is close to the edge of the metal end plate, and the edge covers the protrusion.

4. The battery pack according to claim 3, characterized in that, The protrusion has a contact surface, which gradually moves away from the main body in a direction away from the peripheral edge, and the edge portion is attached to the contact surface.

5. The battery pack according to claim 3, characterized in that, The metal end plate has two spaced-apart limiting ribs on the side facing away from the cell assembly. There are two protrusions, each close to the opposite edges of the metal end plate. The two limiting ribs are located between the two protrusions, and each protrusion forms a limiting groove with its adjacent limiting rib. The battery pack also includes two straps. There are two metal end plates, arranged opposite each other. The cell assembly is located between the two metal end plates. An insulating sheet is provided between each metal end plate and the cell assembly. Each strap surrounds the cell assembly and the two metal end plates, with a portion of one strap confined within a corresponding limiting groove to bind the cell assembly and the two metal end plates.

6. The battery pack according to any one of claims 1 to 5, characterized in that, The edge portion includes multiple insulating segments, which are connected sequentially along the circumference of the main body portion. A first curved segment connects two adjacent insulating segments to ensure a smooth transition between them.

7. The battery pack according to any one of claims 1 to 5, characterized in that, The main body and the edge portion are connected by a second curved segment to allow for a smooth transition between the main body and the edge portion.

8. The battery pack according to any one of claims 1 to 5, characterized in that, The edge portion and the main body portion form an insulating space for accommodating the metal end plate. The side of the edge portion away from the electrode of the cell assembly is provided with a clearance opening. The clearance opening communicates with the insulating space so that the metal end plate can enter the insulating space through the clearance opening.

9. The battery pack according to any one of claims 1 to 5, characterized in that, The main body has an adhesive area on the side facing the metal end plate, and the main body is attached to the metal end plate through the adhesive area.

10. An energy storage device, characterized in that, include: The battery pack according to any one of claims 1 to 9; The battery pack is disposed within the mounting housing.

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