A battery pack

Abstract

The utility model discloses a battery pack, including shell, electric core group, bandage and two end plates, electric core group sets up on shell. Two end plates set up in the opposite sides of electric core group, and end plate with shell is connected. The bandage is around the periphery of electric core group and end plate, and the bandage includes first section, second section and insulating part, and the insulating part covers first section and second section, and first section is around electric core group, and second section is around end plate. Solve the technical problem of the battery pack easy to occur leakage when heat runaway, cause the accident.

Description

Technical Field

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

[0002] With the increasing demand for energy, batteries, as an important energy storage device, are widely used in electric vehicles, energy storage systems, portable electronic devices, and other fields. Lithium-ion battery packs, in particular, play a crucial role in various applications due to their high energy density and excellent performance.

[0003] Traditional battery pack designs often employ single protective measures, such as an insulation layer on the steel strip. However, this design still has certain shortcomings. In the event of thermal runaway or leakage in the battery cell, the high-temperature electrolyte may corrode the insulation layer on the steel strip, causing the steel strip to come into contact with the outer casing. This allows current to flow through the steel strip to the outer casing, resulting in an accident. Utility Model Content

[0004] One objective of this invention is to provide a battery pack that addresses the technical problem of leakage and accidents that can easily occur when a battery pack experiences thermal runaway.

[0005] To achieve the above objectives, this utility model provides a solution: a battery pack comprising: a casing, a battery cell assembly, a binding strap, and two end plates, wherein the battery cell assembly is disposed on the casing. The two end plates are disposed on opposite sides of the battery cell assembly and are connected to the casing. The binding strap is wrapped around the periphery of the battery cell assembly and the end plates, and the binding strap includes a first section, a second section, and an insulating portion, the insulating portion covering the first and second sections, the first section being wrapped around the battery cell assembly, and the second section being wrapped around the end plates.

[0006] Optionally, the end plate has an operation port that extends through the side of the end plate away from the battery cell assembly, and the second section covers at least part of the operation port.

[0007] Optionally, the end plate includes a base and multiple limiting parts. The base is disposed on opposite sides of the battery cell assembly, and the multiple limiting parts are spaced apart on the side of the base away from the battery cell assembly. The second section passes through the adjacent limiting parts.

[0008] Optionally, the battery pack includes an insulating layer and a protective element. The insulating layer is coated on the outer casing, and the protective element is disposed between the insulating layer and the cell assembly to separate the insulating layer and the cell assembly.

[0009] Optionally, the housing has a receiving groove, an insulating layer covers the inner wall of the receiving groove, a protective element is disposed in the receiving groove and covered by the insulating layer, and at least a portion of the battery cell assembly is disposed in the receiving groove and is disposed on the side of the protective element away from the insulating layer.

[0010] Optionally, the housing includes a first wall and a plurality of second walls, the plurality of second walls being arranged around the first wall, the first wall and the plurality of second walls being interconnected to form the inner wall of the receiving groove, and an insulating layer covering the first wall and the plurality of second walls. The protective member includes a first part and a plurality of second parts interconnected, the first part covering the first wall and the second parts covering the second walls.

[0011] Optionally, multiple battery cell groups are spaced apart along the first direction, and the protective element includes multiple third parts spaced apart along the first direction. The third parts are disposed between adjacent battery cell groups to separate adjacent battery cell groups.

[0012] Optionally, the housing has a limiting groove on the inner wall of the receiving groove, the limiting groove and the receiving groove are connected, the insulating layer covers the inner wall of the limiting groove, and at least part of the battery cell assembly is inserted into the limiting groove.

[0013] Optionally, a liquid collection tank is provided on the side of the protective component facing the battery pack.

[0014] Optionally, multiple battery cell groups are provided along the first direction, and the liquid collection tank extends along the first direction and spans multiple battery cell groups.

[0015] Optionally, the collection tank is arranged in an S-shape.

[0016] Optionally, the insulating part is in the form of a thin film.

[0017] Optionally, the insulating part is bonded or coated on the surface of the first and second segments, and the thickness of the insulating part is 0.02mm-0.2mm.

[0018] Optionally, the insulating part is a heat shrink tubing, which is sleeved on the outside of the first and second sections. The insulating part is covered by the first and second sections by heat shrinking, and the thickness of the insulating part is 0.1mm-0.5mm.

[0019] The beneficial effects of this utility model are as follows:

[0020] The battery pack includes a casing, a cell assembly, straps, and two end plates. The cell assembly is mounted on the casing. The two end plates are located on opposite sides of the cell assembly and are connected to the casing. The straps are wrapped around the cell assembly and end plates. The straps include a first section, a second section, and an insulating portion. The insulating portion covers the first and second sections. The first section is wrapped around the cell assembly, and the second section is wrapped around the end plates.

[0021] In practical applications, the safety of the battery pack is significantly improved by incorporating an insulating portion in the first section of the binding strap. Traditional binding straps typically only have an insulating portion covering the second section. In the event of thermal runaway in the cell, the splashed high-temperature electrolyte may damage the insulation of the second section, causing current to flow through it to the first section, then through the first section to the end plate, and finally to the casing, potentially leading to a battery accident. This application, however, designs the insulating portion to cover both the first and second sections, ensuring good insulation between the first section and the end plate even in the event of thermal runaway in the cell. This effectively prevents abnormal current conduction, avoids short circuits or other safety hazards caused by insulation failure, and enhances the safety of the battery pack in the event of thermal runaway in the cell. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a structural schematic diagram of a protective component without a liquid collection tank, provided by an embodiment of the present utility model.

[0024] Figure 2 This is a schematic diagram of the overall structure of the battery pack provided in this embodiment of the utility model;

[0025] Figure 3 This is provided by the embodiment of the present utility model. Figure 2 A magnified view of a portion of region A in the middle;

[0026] Figure 4 This is a schematic diagram of the cross-sectional structure of the strap provided in this embodiment of the utility model;

[0027] Figure 5 This is provided by the embodiment of the present utility model. Figure 4 A magnified view of a portion of region B in the middle;

[0028] Figure 6 This is a structural schematic diagram of a protective component with a liquid collection tank provided in this embodiment of the utility model;

[0029] Figure 7 This is provided by the embodiment of the present utility model. Figure 6 A magnified view of a portion of region C in the middle;

[0030] Figure 8This is a schematic diagram of the structure of the receiving tank provided in an embodiment of the present invention.

[0031] Explanation of icon numbers:

[0032] 20. Outer shell; 21. Receiving tank; 22. First wall; 23. Second wall; 24. Limiting groove; 30. Battery cell assembly; 40. End plate; 41. Base; 411. Operating port; 42. Limiting part; 50. Binding strap; 51. First section; 52. Second section; 53. Insulating part; 60. Protective component; 61. First part; 62. Second part; 63. Third part; 64. Liquid collection tank; 70. First direction. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please see Figures 1 to 5 As shown, Figure 1 This is a structural schematic diagram of the protective member 60 without a liquid collection tank 64 provided in this embodiment of the present invention. Figure 2 This is a schematic diagram of the overall structure of the battery pack provided in this embodiment of the utility model. Figure 3 This is provided by the embodiment of the present utility model. Figure 2 A magnified view of a portion of region A in the middle. Figure 4 This is a schematic diagram of the cross-sectional structure of the strap 50 provided in this embodiment of the present invention. Figure 5 This is provided by the embodiment of the present utility model. Figure 4 A magnified view of a portion of region B in the middle.

[0035] This utility model provides a battery pack, including: a shell 20, a cell assembly 30, a strap 50, and two end plates 40. The cell assembly 30 is disposed on the shell 20. The two end plates 40 are disposed on opposite sides of the cell assembly 30 and are connected to the shell 20. The strap 50 is wrapped around the periphery of the cell assembly 30 and the end plates 40. The strap 50 includes a first section 51, a second section 52, and an insulating portion 53. The insulating portion 53 covers the first section 51 and the second section 52. The first section 51 is wrapped around the cell assembly 30, and the second section 52 is wrapped around the end plates 40.

[0036] In practical applications, the safety of the battery pack is significantly improved by incorporating an insulating portion 53 on the first segment 51 of the binding strap 50. Traditional binding straps typically only have the insulating portion 53 covered on the second segment 52. In the event of thermal runaway in the battery cell, the splashed high-temperature electrolyte may damage the insulating portion 53 of the second segment 52, causing current to be conducted through the second segment 52 to the first segment 51, then through the first segment 51 to the end plate 40, and further to the casing 20, potentially leading to a battery accident. This application designs the insulating portion 53 to cover both the first segment 51 and the second segment 52, ensuring good insulation between the first segment 51 and the end plate 40 even in the event of thermal runaway in the battery cell. This effectively prevents abnormal current conduction, avoids short circuits or other safety hazards caused by insulation failure, and improves the safety of the battery pack in the event of thermal runaway in the battery cell.

[0037] For strength considerations, both the first segment 51 and the second segment 52 are steel strips. The material of the insulating part 53 can be polyester, polyimide film polyurethane, cross-linked polyethylene or other polymer insulating materials, heat shrink tubing, or glass fiber / polyester fiber, etc. The connection method between the insulating part 53 and the first segment 51 is the same as the connection method between the insulating part 53 and the second segment 52. Therefore, the connection method between the insulating part 53 and the first segment 51 will be used as an example for explanation. If the insulating part 53 is heat shrink tubing, it can be sleeved on the first segment 51, and then heated to shrink or fuse it to the surface of the first segment 51, forming a tight cover. In this case, the thickness of the insulating part 53 is 0.1mm-0.5mm. If the insulating part 53 is a polyurethane insulating coating, it can be bonded or coated on the surface of the first segment 51 to form a polyurethane insulating coating. In this case, the thickness of the insulating part 53 is 0.02mm-0.2mm.

[0038] In one embodiment, see Figure 3 and Figure 5 The end plate 40 has an operation port 411, which extends through the side of the end plate 40 away from the cell assembly 30. The second section 52 covers at least part of the operation port 411.

[0039] In practical applications, by opening an operation port 411 on the end plate 40 and having the second segment 52 of the strap 50 cover at least part of the operation port 411, this application can effectively improve the operability and safety of the battery pack. Specifically, the design of the operation port 411 allows operators to insert tools through the port to push the second segment 52 of the strap 50, thereby adjusting the position of the strap 50. This design facilitates the installation, debugging, and maintenance of the battery pack.

[0040] In one embodiment, see Figure 3The end plate 40 includes a base 41 and a plurality of limiting parts 42. The base 41 is disposed on opposite sides of the cell assembly 30, and the plurality of limiting parts 42 are disposed at intervals on the side of the base 41 away from the cell assembly 30. The second segment 52 passes through the adjacent limiting parts 42.

[0041] In practical applications, the setting of multiple limiting parts 42 helps to limit the range of motion of the strap 50, ensuring that the second section 52 of the strap 50 is always kept in the predetermined position, thereby preventing the strap 50 from shifting or loosening due to vibration, external force or other factors, ensuring that the position of the battery cell assembly 30 in the housing 20 remains stable, and reducing problems such as battery cell displacement and poor contact that may be caused by the loosening of the strap 50.

[0042] Optionally, see Figure 2 The battery pack includes an insulating layer and a protective element 60. The insulating layer is coated on the outer shell 20, and the protective element 60 is disposed between the insulating layer and the cell assembly 30 to separate the insulating layer and the cell assembly 30.

[0043] Because the insulation layer is thin, it is not shown in the attached drawings.

[0044] In practical applications, by coating the outer casing 20 with an insulating layer and placing a protective element 60 between it and the battery cell assembly 30, this application can effectively prevent direct contact between the battery cell assembly 30 and the outer casing 20, thereby reducing potential risks caused by external short circuits, current leakage, or external environmental interference to the battery cell assembly 30. Specifically, the coating of the insulating layer acts as a current barrier, preventing electrical contact between the battery cell assembly 30 and the outer casing 20, and avoiding electrical faults or short circuits that may be caused by potential differences between the inside and outside of the battery.

[0045] The protective component 60 forms a physical isolation between the insulation layer and the cell assembly 30, preventing contact failure caused by physical damage, wear, or corrosion of the insulation layer. This design ensures that the cell assembly 30 remains well isolated from the outer casing 20, preventing interference from the external environment and improving the safety of the battery pack. Especially when the battery pack encounters external forces such as collisions or vibrations, or experiences thermal runaway leading to the splashing of high-temperature electrolyte, the protective component 60 effectively reduces the risk of direct contact between the insulation layer and the high-temperature electrolyte, ensuring the long-term reliability of the battery pack.

[0046] Overall, the combination of insulation layer and protective component 60 enhances the electrical safety of the battery pack, while improving its resistance to external environmental interference, further improving the battery pack's service life and safety.

[0047] In this embodiment, the insulating layer can be made of polyester film, polyvinyl chloride, polyurethane, or epoxy resin, etc. The protective component 60 can be made of high-temperature resistant silicone rubber, polytetrafluoroethylene, polypropylene, polycarbonate, or high-temperature flame-retardant plastic, etc.

[0048] Further, see Figure 5 and Figure 6 The outer casing 20 has a receiving groove 21, an insulating layer covers the inner wall of the receiving groove 21, a protective member 60 is disposed in the receiving groove 21 and covered with the insulating layer, at least a portion of the battery cell assembly 30 is disposed in the receiving groove 21 and is disposed on the side of the protective member 60 away from the insulating layer.

[0049] In practical applications, by opening a receiving groove 21 on the outer casing 20 and coating the inner wall of the receiving groove 21 with an insulating layer, and then placing the protective component 60 inside the receiving groove 21 and covering it with the insulating layer, the protective component 60 not only enhances the physical isolation effect of the insulating layer, but also collects and guides the high-temperature electrolyte when the battery pack experiences thermal runaway, thereby reducing the damage of the high-temperature electrolyte to the outer casing 20 and other electrical components.

[0050] Specifically, the material selection and design of the protective component 60 give it high thermal stability and heat absorption capacity. When the battery pack experiences thermal runaway or is used in a high-temperature environment, the electrolyte may leak or splash. The protective component 60 can effectively collect and store this high-temperature electrolyte, thereby preventing it from directly contacting the housing 20 and other electrical components, and reducing the risk of corrosion, damage or short circuit to the housing 20 and electrical components.

[0051] In addition, the battery cell assembly 30 is disposed in the receiving groove 21, so that the protective member 60 can abut against the part of the battery cell assembly 30 disposed in the receiving groove 21, thereby further stabilizing the battery cell assembly 30, preventing the battery cell assembly 30 from being displaced under the action of external force or restricting the thermal expansion of the battery cell assembly 30, and ensuring the stability and safety of the battery cell assembly 30 within the outer casing 20.

[0052] In summary, this application, through the reasonable combination of the receiving groove 21, the insulating layer and the protective component 60, not only enhances the electrical isolation and thermal management capabilities of the battery pack, but also effectively prevents high-temperature electrolyte from damaging the casing 20 and other electrical components in high-temperature environments, thereby improving the safety, stability and service life of the battery pack.

[0053] Furthermore, referring to Figure 5 , Figure 6 , Figure 7 and Figure 8The outer casing 20 includes a first wall 22 and a plurality of second walls 23, which are arranged around the first wall 22. The first wall 22 and the plurality of second walls 23 are interconnected to form the inner wall of the receiving groove 21. The first wall 22 and the second walls 23 are arranged perpendicularly and are adjacent to each other. An insulating layer covers the first wall 22 and the plurality of second walls 23. The protective member 60 includes a first part 61 and a plurality of second parts 62 that are interconnected. The first part 61 covers the first wall 22, and the second parts 62 cover the second walls 23.

[0054] In practical applications, the protective part 60 covers both the first wall 22 and the second wall 23. That is, the protective part 60 covers all the inner walls of the receiving tank 21, thereby reducing the possibility of high-temperature electrolyte splashing onto the second wall 23, corroding the insulating layer on the second wall 23, and then corroding the insulating layer on the first wall 22.

[0055] Optionally, refer to Figure 7 The outer casing 20 has a limiting groove 24 on the inner wall of the receiving groove 21. The limiting groove 24 is connected to the receiving groove 21. An insulating layer covers the inner wall of the limiting groove 24. At least a portion of the battery cell assembly 30 is inserted into the limiting groove 24. The protective part 60 covers the inner wall of the limiting groove 24. Since the thickness of the protective part 60 is uniform, the protective part 60 forms a groove that matches the limiting groove 24. The inner wall of the groove fits against the outer wall of the battery cell assembly 30.

[0056] In practical applications, by opening a limiting groove 24 on the inner wall of the receiving groove 21 and inserting the battery cell assembly 30 into the limiting groove 24, the inner wall of the groove formed by the protective part and the outer wall of the battery cell assembly 30 are made to fit together. This application can effectively achieve the fixing and positioning of the battery cell assembly 30 in the receiving groove 21, thereby further improving the stability of the battery cell assembly 30, preventing the battery cell assembly 30 from shifting or shaking during the use of the battery pack, and reducing the safety risks caused by the displacement or instability of the battery cell assembly 30.

[0057] Specifically, the limiting groove 24 provides a mechanical constraint on the cell assembly 30, ensuring its precise position within the battery pack and preventing accidental movement under external vibration or mechanical impact. Inserting the cell assembly 30 into the limiting groove 24 not only improves the stability of the cell assembly 30 during transportation and use, but also reduces friction or collisions between the cells, lowering the risk of damage or thermal runaway caused by inter-cell friction.

[0058] Furthermore, the insulating layer covering the inner wall of the limiting groove 24 further ensures electrical isolation between the cell assembly 30 and the outer casing 20, preventing electrical faults or short circuits caused by the cell assembly 30 contacting the outer casing 20 or other components. Especially in high-temperature or high-pressure operating environments, the insulating layer effectively prevents current leakage or external interference to the cell assembly 30, thereby improving the overall safety and reliability of the battery pack.

[0059] Optionally, refer to Figure 5 and Figure 7 The battery cell group 30 is provided with multiple units spaced apart along the first direction 70. The protective member 60 includes multiple third parts 63 spaced apart along the first direction 70. The third parts 63 are provided between adjacent battery cell groups 30 to separate adjacent battery cell groups 30.

[0060] In practical applications, by arranging multiple cells at intervals along the first direction 70 in the cell group 30, and providing a third part 63 between adjacent cell groups 30, the third part 63 abuts against the adjacent cell group 30. This application can effectively prevent direct contact or mutual interference between cell groups 30, and limit and fix the cell groups 30 from the bottom, thereby improving the safety and stability of the battery pack. The provision of the third part 63 can form physical isolation between cell groups 30, reducing potential short circuits or other electrical faults caused by contact or collision between cell groups 30.

[0061] Specifically, the cell assembly 30 is fixed to the outer casing 20 by the end plate 40. The third part 63, acting as an isolation between adjacent cell assemblies 30, helps prevent the straps 50 from breaking or deforming when the battery pack is subjected to external impact or vibration. This would prevent poor contact between the cells after they separate from the end plate 40, avoiding problems such as thermal runaway, short circuits, or battery pack performance degradation caused by contact between cells. In addition, the third part 63 also improves the battery pack's shock resistance, especially during transportation or application, effectively reducing the relative movement between cell assemblies 30 and improving the battery pack's anti-interference capability.

[0062] Overall, by setting multiple third-part 63 protective elements 60 spaced apart along the first direction 70, not only is the structural stability and mechanical strength of the battery pack improved, but its electrical safety, shock resistance and long-term reliability under high temperature conditions are also effectively enhanced.

[0063] Optionally, refer to Figure 2 and Figure 6 The protective component 60 has a liquid collection tank 64 on the side facing the battery cell assembly 30.

[0064] In practical applications, by creating a collection tank 64 on the side of the protective component 60 facing the cell assembly 30, this application can effectively collect high-temperature electrolyte that may leak during battery pack use, preventing damage to other components of the battery pack or the external environment caused by the high-temperature electrolyte. The design of the collection tank 64, by guiding the electrolyte into the tank, helps to effectively isolate the electrolyte from contact with the casing 20, electronic components, or other sensitive parts, thereby avoiding electrical faults or corrosion problems caused by electrolyte leakage.

[0065] Specifically, when electrolyte leakage occurs in the battery pack under thermal runaway conditions, the collection tank 64 provides a collection space to concentrate the leaked electrolyte and prevent it from spreading to other areas of the battery pack, especially the battery pack casing 20 or electrical connection parts, thus avoiding negative impacts on electrical performance or structure caused by the leaked electrolyte. The design of the collection tank 64 effectively improves the safety of the battery pack and reduces the risk of short circuits, corrosion, or other accidents caused by electrolyte leakage.

[0066] Furthermore, referring to Figure 2 and Figure 6 Multiple battery cell groups 30 are provided along the first direction 70, and liquid collection tanks 64 extend along the first direction 70 and span multiple battery cell groups 30.

[0067] In practical applications, by extending the liquid collection tank 64 along the first direction 70 and spanning multiple cell groups 30, this application can form a continuous liquid collection channel among multiple cell groups 30, effectively improving the overall functionality and reliability of the liquid collection tank 64 in the battery pack. Specifically, this design ensures that in the event of electrolyte leakage, the liquid collection tank 64 can laterally cover the entire area of ​​the cell group 30, reducing the spread of electrolyte leakage and ensuring that all areas of the cell group 30 are protected, preventing disorderly flow of electrolyte within the battery pack.

[0068] The design of the electrolyte collection tank 64 extending between multiple cell packs 30 further enhances the safety of the battery pack under high temperature or thermal runaway conditions. In the event of electrolyte leakage, the collection tank 64 can quickly collect and guide the electrolyte flow to the collection area, thereby effectively preventing damage to other cell packs 30 or other components of the battery pack. This design improves the battery pack's anti-leakage performance, enabling it to effectively collect electrolyte even when multiple cell packs 30 simultaneously face thermal runaway or other abnormal conditions, reducing the risk of fault propagation.

[0069] Furthermore, referring to Figure 2 and Figure 6 The liquid collection tank 64 is set along an S-shape.

[0070] In practical applications, the S-shaped electrolyte collection tank 64, through its tortuous structure, effectively slows down the flow rate of the electrolyte, allowing it more time to be captured and guided to the collection area. This reduces the extent of electrolyte diffusion within the battery pack and prevents secondary damage to other components or cell groups 30 caused by electrolyte leakage. Furthermore, the S-shaped structure enhances the adaptability of the collection tank 64 to leakage from different directions. Especially when multiple cell groups 30 are present within the battery pack, the S-shaped layout can cover a larger area, improving the reliability of liquid collection.

[0071] In cases of thermal runaway or high temperature, the S-shaped electrolyte collection tank 64, through its special structure, can disperse the heat conduction path that may be caused by electrolyte leakage, reduce the heat conduction effect of the leaked electrolyte on other components inside the battery pack, and help reduce the risk of accidents caused by high temperature.

[0072] In other embodiments, the liquid collection tank 64 may also be in other shapes such as straight line or U-shape.

[0073] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0074] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0075] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0076] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A battery pack, characterized by, include: shell; A battery cell assembly, wherein the battery cell assembly is disposed on the outer casing; Two end plates are disposed on opposite sides of the battery cell assembly, and the end plates are connected to the outer casing; A binding strap is wrapped around the periphery of the battery cell assembly and the end plate. The binding strap includes a first section, a second section, and an insulating portion. The insulating portion covers the first section and the second section. The first section is wrapped around the battery cell assembly, and the second section is wrapped around the end plate.

2. The battery pack according to claim 1, characterized in that, The end plate has an operation port that extends through the side of the end plate away from the battery cell assembly, and the second section covers at least a portion of the operation port.

3. The battery pack according to claim 1, characterized in that, The end plate includes a base and a plurality of limiting parts. The base is disposed on opposite sides of the battery cell assembly, and the plurality of limiting parts are spaced apart on the side of the base away from the battery cell assembly. The second segment passes through the adjacent limiting parts.

4. The battery pack according to claim 1, characterized in that, The battery pack includes an insulating layer and a protective element. The insulating layer is coated on the outer casing, and the protective element is disposed between the insulating layer and the battery cell assembly to separate the insulating layer and the battery cell assembly.

5. The battery pack according to claim 4, characterized in that, The outer casing has a receiving groove, the insulating layer covers the inner wall of the receiving groove, the protective member is disposed in the receiving groove and covers the insulating layer, at least a portion of the battery cell assembly is disposed in the receiving groove and is disposed on the side of the protective member away from the insulating layer.

6. The battery pack according to claim 5, characterized in that, The outer casing includes a first wall and a plurality of second walls, the plurality of second walls being arranged around the first wall, the first wall and the plurality of second walls being interconnected to form the inner wall of the receiving groove, and the insulating layer covering the first wall and the plurality of second walls; The protective component includes a first part and a plurality of second parts that are interconnected, the first part covering the first wall and the second parts covering the second wall.

7. The battery pack according to claim 5, characterized in that, The outer casing has a limiting groove on the inner wall of the receiving groove, the limiting groove is connected to the receiving groove, the insulating layer covers the inner wall of the limiting groove, and at least a portion of the battery cell assembly is inserted into the limiting groove.

8. The battery pack according to claim 4, characterized in that, The battery cell groups are spaced apart along a first direction, and the protective member includes a plurality of third parts spaced apart along the first direction. The third parts are disposed between adjacent battery cell groups to separate adjacent battery cell groups.

9. The battery pack according to claim 4, characterized in that, The protective component has a liquid collection tank on the side facing the battery pack.

10. The battery pack according to claim 9, characterized in that, The battery cell assembly is provided in multiple ways along the first direction, and the liquid collection tank extends along the first direction and spans the multiple battery cell assemblies.

11. The battery pack according to claim 9, characterized in that, The liquid collection tank is arranged in an S-shape.

12. The battery pack according to claim 1, characterized in that, The insulating part is in the form of a thin film.

13. The battery pack according to claim 12, characterized in that, The insulating part is bonded or coated on the surfaces of the first segment and the second segment, and the thickness of the insulating part is 0.02mm-0.2mm.

14. The battery pack according to claim 12, characterized in that, The insulating part is a heat shrink tubing, which is sleeved on the outside of the first section and the second section. The insulating part is covered by the first section and the second section by heat shrinking. The thickness of the insulating part is 0.1mm-0.5mm.

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