Short-knife battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a short-knife battery pack which comprises a box body, three battery cell modules, a longitudinal battery cell assembly and an electrical wire harness, the box body comprises a frame and two longitudinal beams, and each longitudinal beam is provided with a containing channel penetrating through the length direction of the longitudinal beam; the three battery cell modules are sequentially arranged in the three module accommodating areas in parallel; battery cells in the battery cell module are arranged along the Y direction; the longitudinal battery cell assembly is arranged in the containing channel of one longitudinal beam, and battery cells in the longitudinal battery cell assembly are arranged in the X direction; the electrical wire harness is arranged in the accommodating channel of the other longitudinal beam; the longitudinal battery cell assembly, the first battery cell module, the second battery cell module and the third battery cell module are sequentially connected in series, and a total positive electrode and a total negative electrode are respectively led out from the longitudinal battery cell assembly and the third battery cell module on the same side. According to the utility model, a high-voltage loop in the battery pack is free of a long copper bar, the space utilization rate in the battery pack is improved, and the average fast charge rate is over 4C.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a short-blade battery pack. Background Technology

[0002] CTC (Cell to Chassis) and CTB (Cell to Body) technologies are significant innovations in the electric vehicle field in recent years. These two technologies simplify overall vehicle design, improve structural efficiency, reduce the number of parts, save space, and significantly reduce vehicle weight by directly integrating the battery into the vehicle's chassis or body. These advantages not only improve the overall performance of the vehicle but also increase the battery's driving range, leading to their widespread adoption.

[0003] The short-blade battery, due to the excellent load-bearing capacity of its cells, allows the top cover (water-cooled plate or flat cover) to serve as the vehicle floor, making it highly compatible with CTC and CTB designs. This design not only simplifies the battery pack structure but also improves vehicle rigidity and safety.

[0004] Currently, the short-blade battery pack uses L600 cells. The length limitation of the L600 cells restricts their layout in the width direction of the battery pack. Typically, only a two-row arrangement can be used. However, in the current CTC / CTB scheme, the available width of the battery pack is relatively large, usually greater than 1330mm, resulting in excess width space within the pack, but the width space of the battery pack cannot be fully utilized. Utility Model Content

[0005] In view of this, the present invention provides a short-blade battery pack to solve the problem of low space utilization in the width direction of the short-blade battery pack.

[0006] This utility model provides a short-blade battery pack, including a housing, three cell modules, a longitudinal cell assembly, and an electrical harness. The housing is a semi-enclosed structure with an open top, and includes a frame and two longitudinal beams. The two longitudinal beams are arranged along the X direction and divide the area within the frame into three parallel module receiving areas. The longitudinal beams have receiving channels running through their length. The three cell modules are a first cell module, a second cell module, and a third cell module. The three cell modules are arranged in parallel within the three module receiving areas. The cells in the cell modules are arranged along the Y direction. The longitudinal cell assembly is located in the receiving channel of one of the longitudinal beams, and the cells in the longitudinal cell assembly are arranged along the X direction. The electrical harness is located in the receiving channel of the other longitudinal beam. The longitudinal cell assembly, the first cell module, the second cell module, and the third cell module are connected in series, and the longitudinal cell assembly and the third cell module respectively lead out the total positive and total negative terminals on the same side.

[0007] In one optional embodiment, an electrical compartment is provided at the rear end of the enclosure, and a high-voltage distribution box is provided inside the electrical compartment. The main positive terminal and the main negative terminal are both located on the side close to the electrical compartment. The main positive terminal is connected to the positive terminal of the high-voltage distribution box through a first copper busbar, and the main negative terminal is connected to the negative terminal of the high-voltage distribution box through a second copper busbar.

[0008] In one alternative implementation, the first battery cell module and the second battery cell module are connected in series via a third copper busbar, with the third copper busbar and the second copper busbar arranged across each other.

[0009] In one alternative embodiment, the housing further includes a bottom plate located at the bottom of the frame, and the longitudinal beam includes two side plates. The bottom of the side plates is fixedly connected to the bottom plate of the frame, and the gap between the two side plates forms an accommodating channel.

[0010] In one optional embodiment, the number of cells in the first and third cell modules is N, the number of cells in the second cell module is N-1, and an interface assembly gap is left between the second cell module and the front end of the frame; the short blade battery pack also includes a low-voltage interface and a front-drive high-voltage interface, which are located in the interface assembly gap and extend to the outside of the frame.

[0011] In one optional embodiment, it further includes at least one first limiting plate, which is disposed in the interface assembly gap and abuts against the frame and the second battery cell module.

[0012] In one optional embodiment, the two longitudinal beams are a first longitudinal beam located between the first cell module and the second cell module, and a second longitudinal beam located between the second cell module and the third cell module, respectively. The tandem cell assembly is disposed within the receiving channel of the first longitudinal beam. The short blade battery pack also includes several second limiting plates. Second limiting plates are provided between one side plate of the first longitudinal beam and the first cell module, and between the other side plate of the first longitudinal beam and the second cell module. The second limiting plates on both sides are used to limit the tandem cell assembly along the Y direction.

[0013] In one alternative embodiment, a top cover is also included, which is adapted to fit with the frame of the housing and is used to close the top opening of the housing. The top cover and the bottom plate of the housing form a limit for the cell module and the longitudinal cell assembly along the Z direction. The second limiting plate is a detachable structure; or, the second limiting plate is connected to the top cover.

[0014] In one alternative embodiment, an insulating heat insulation element is provided between the two side plates of the longitudinal cell assembly and the longitudinal beam.

[0015] In one optional embodiment, both the cell module and the tandem cell assembly are composed of multiple blade cells with a length of 400mm. The blade cells have a bottom-out explosion-proof valve structure or a side-out explosion-proof valve structure.

[0016] Beneficial Effects: The short-blade battery pack provided in this embodiment uses short-blade cells of approximately 400mm in diameter, arranged in a three-row layout. A longitudinal beam is installed between every two rows of cell modules. Specifically, the first longitudinal beam connects the first and second cell modules, and the second longitudinal beam connects the second and third cell modules. The first longitudinal beam can be used for arranging the vertically aligned cell assemblies. By setting up these vertically aligned cell assemblies, the total positive and negative terminals of the battery can be located on the same side, i.e., close to the high-voltage distribution box, thereby enabling the battery to achieve... The high-voltage circuit inside the battery pack has no long copper busbars, and there is no wasted space inside the battery pack. This increases the number of cells in series, maximizing the installed capacity and meeting the requirements of high-end products that require both fast charging and high installed capacity. It avoids the occurrence of long copper busbars, reduces electrical connection costs and high-voltage circuit impedance, and avoids the risk of insulation failure or short circuits in surrounding components caused by long high-voltage charged copper busbars. At the same time, compared with the L600 cells in related technologies, this utility model uses L400 cells. Due to the shorter cell length and lower internal resistance, the cells have an average fast charging rate of over 4C. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a partial structure of a battery pack according to an embodiment of the present invention, viewed from a first perspective.

[0019] Figure 2 for Figure 1 Enlarged view of the middle and rear structure;

[0020] Figure 3 for Figure 1 Top view;

[0021] Figure 4 for Figure 1 The diagram shown is a structural schematic from a second perspective.

[0022] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0023] Figure 6 for Figure 4 A partial enlarged view of point B in the middle;

[0024] Figure 7A schematic diagram of the battery cell with a bottom-out explosion-proof valve structure;

[0025] Figure 8 This is a schematic diagram of the battery cell structure for a side-outlet explosion-proof valve.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Enclosure; 11. Frame; 12. Longitudinal beam; 121. First longitudinal beam; 122. Second longitudinal beam; 21. First battery cell module; 22. Second battery cell module; 23. Third battery cell module; 24. Column battery cell assembly; 3. Electrical wiring harness; 4. Electrical compartment; 5. High-voltage distribution box; 6. First copper busbar; 7. Second copper busbar; 8. Third copper busbar; 9. Low-voltage interface; 10. Front-drive high-voltage interface; 20. First limiting plate; 30. Second limiting plate; 210. Blade battery cell; 2101. Explosion-proof valve; 2102. Main surface; 2103. Bottom surface; 2104. Side surface. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] The short-blade battery pack in the relevant technology uses L600 cells, which, in addition to the problem of low space utilization, also suffers from insufficient fast charging rate.

[0030] Specifically, in current 400V or 800V systems, the cell capacity is typically around 150Ah, and the average fast charging rate of mass-produced solutions has reached 4C. However, the average fast charging rate of L600 cells can only reach a maximum of around 3.5C, which is insufficient to meet the mainstream fast charging rate requirement of high-end products, which is greater than or equal to 4C.

[0031] To overcome the aforementioned limitations of the L600 battery cell, this invention proposes a short-blade battery pack, employing a 400mm long short-blade battery cell design with a three-row layout in the width direction, thus maximizing space utilization in that direction. Simultaneously, the shorter cell length reduces internal resistance, enabling the cell to achieve an average fast charging rate of 4C or higher.

[0032] The following combination Figures 1 to 8 The following describes embodiments of the present invention.

[0033] According to an embodiment of the present invention, a short-blade battery pack is provided, including a housing 1, three cell modules, a row of cell assemblies 24, and an electrical wiring harness 3. The housing 1 is a semi-enclosed structure with an open top. The housing 1 includes a frame 11 and two longitudinal beams 12. The two longitudinal beams 12 are arranged along the X direction and divide the area within the frame 11 into three parallel module receiving areas. The longitudinal beams 12 have receiving channels that run through their length. The three battery cell modules are a first battery cell module 21, a second battery cell module 22, and a third battery cell module 23. The three battery cell modules are arranged in parallel within the three module receiving areas. The battery cells in the battery cell modules are arranged along the Y direction. A longitudinal battery cell assembly 24 is located in the receiving channel of one of the longitudinal beams 12, and the battery cells in the longitudinal battery cell assembly 24 are arranged along the X direction. The electrical wiring harness 3 is located in the receiving channel of the other longitudinal beam 12. The longitudinal battery cell assembly 24, the first battery cell module 21, the second battery cell module 22, and the third battery cell module 23 are connected in series. The longitudinal battery cell assembly 24 and the third battery cell module 23 have their main positive and main negative terminals led out on the same side, respectively.

[0034] Specifically, when using L400 blade cells 210 in a three-row layout within the battery pack, the total positive and negative terminals are located diagonally across the battery pack housing 1. This results in a long copper busbar with either a single positive or negative terminal within the battery pack, leading to high electrical connection costs. Furthermore, the long copper busbar positioned between two rows of cells presents high voltage, which, in the event of insulation failure, can easily cause short circuits and arcing, posing safety risks. Additionally, the longer busbar increases the impedance of the high-voltage circuit of the entire battery pack, impacting system efficiency. Therefore, the issue of the long copper busbar needs to be addressed simultaneously.

[0035] The short-blade battery pack provided in this embodiment uses short-blade cells of approximately 400mm in diameter, arranged in a three-row layout. A longitudinal beam 12 is installed between every two rows of cell modules. Specifically, the first longitudinal beam 121 is located between the first cell module 21 and the second cell module 22, and the second longitudinal beam 122 is located between the second cell module 22 and the third cell module 23. The first longitudinal beam 121 can be used for arranging the longitudinally arranged cell assemblies 24. By setting the longitudinally arranged cell assemblies 24, the total positive and negative terminals of the battery can be located on the same side, i.e., close to the high-voltage distribution box 5. This allows for the elimination of long copper busbars in the high-voltage circuit within the battery pack, improving space utilization, increasing the number of cells connected in series, maximizing the installed capacity, and meeting the requirements of high-end products that combine fast charging and installed capacity. It also avoids the occurrence of long copper busbars, reduces electrical connection costs and high-voltage circuit impedance, and mitigates the risk of insulation failure or short circuits in surrounding components caused by long, high-voltage energized copper busbars. Furthermore, compared to the L600 cells in related technologies, this invention uses L400 cells. Due to the shorter cell length and lower internal resistance, the cells have an average fast charging rate capability of over 4C.

[0036] In some embodiments, the rear end of the housing 1 is provided with an electrical compartment 4, and the electrical compartment 4 is provided with a high-voltage distribution box 5. The main positive terminal and the main negative terminal are both located on the side close to the electrical compartment 4. The main positive terminal is connected to the positive terminal of the high-voltage distribution box 5 through a first copper busbar 6, and the main negative terminal is connected to the negative terminal of the high-voltage distribution box 5 through a second copper busbar 7.

[0037] Specifically, a crossbeam is also provided inside the housing 1, and the electrical compartment 4 is separated from the rear side panel 2104 of the frame 11 by the crossbeam. As previously described, the main positive and main negative terminals are located on the same side. In this case, placing the main positive and main negative terminals on the side closer to the electrical compartment 4 can shorten the length of the copper busbar between the main positive and main negative terminals and the high-voltage distribution box 5, thus avoiding long copper busbars in the battery pack.

[0038] Furthermore, the electrical compartment 4 is located at the rear of the battery pack and is used for the arrangement of the high-voltage distribution box 5, wiring harness and BMS. The rear side panel 2104 of the frame 11 is provided with a rear drive high-voltage interface, a fast charging high-voltage interface and a low-voltage interface 9.

[0039] In some embodiments, the first cell module 21 and the second cell module 22 are connected in series via a third copper busbar 8, and the third copper busbar 8 and the second copper busbar 7 are arranged across each other.

[0040] This configuration allows for the use of a shorter third copper busbar 8 to connect the first cell module 21 and the second cell module 22 in series, while effectively avoiding the second copper busbar 7 and preventing interference. The cross-connected copper busbars allow for more flexible use of space within the battery pack, avoiding the space waste associated with traditional parallel arrangements. By rationally designing the copper busbar layout, the wiring inside the battery pack can be made more compact, thereby improving overall space utilization and resulting in a more rational copper busbar layout that avoids long copper busbars.

[0041] In some embodiments, the housing 1 further includes a bottom plate disposed at the bottom of the frame 11, and the longitudinal beam 12 includes two side plates, the bottom of the side plates being fixedly connected to the bottom plate of the frame 11, and the gap between the two side plates forming an accommodating channel.

[0042] The bottom plate of the housing 1 provides bottom support for limiting the cell module and the tandem cell assembly 24 along the Z direction.

[0043] The longitudinal beam 12, constructed in this way, is open at the top and both ends, and a channel runs through the longitudinal beam 12 in the X direction, which facilitates the assembly of the longitudinal battery cell assembly 24 or the electrical wiring harness 3.

[0044] Specifically, the electrical wiring harness 3 includes a connection harness for the front high-voltage copper busbar and the low-voltage interface 9.

[0045] In some embodiments, the number of cells in the first cell module 21 and the third cell module 23 is N, the number of cells in the second cell module 22 is N-1, and an interface assembly gap is left between the second cell module 22 and the front end of the frame 11; the short blade battery pack also includes a low-voltage interface 9 and a front-drive high-voltage interface 10, which are located in the interface assembly gap and extend from the interface assembly gap to the outside of the frame 11.

[0046] Specifically, the front side panel 2104 of the frame 11 corresponding to the second cell module 22 is provided with a low-voltage interface 9 and a front-drive high-voltage interface 10. The low-voltage interface 9 and the front-drive high-voltage interface 10 penetrate the frame 11, with part of them located inside the frame 11 and the other part located outside the frame 11. In order to reserve installation space for the low-voltage interface 9 and the front-drive high-voltage interface 10, the number of cells in the second cell module 22 is one less than that in the first cell module 21 and the third cell module 23. In this way, an interface assembly gap is formed between the front side panel 2104 of the frame 11 and the module receiving area where the second cell module 22 is located, which is used to assemble the low-voltage interface 9 and the front-drive high-voltage interface 10.

[0047] In some embodiments, at least one first limiting plate 20 is also included, the first limiting plate 20 being disposed in the interface assembly gap and abutting between the frame 11 and the second battery cell module 22.

[0048] This configuration allows the first limiting plate 20 to abut against the frame 11 and the second battery cell module 22. Specifically, the first limiting plate 20 abuts against the front side 2104 plate of the frame 11 and the second battery cell module 22, thereby limiting the position of the second battery cell module 22. In addition to constraining the battery cell, the first limiting plate 20 can also have grooves for placing and fixing wire harnesses and copper busbars.

[0049] In some embodiments, the two longitudinal beams 12 are respectively a first longitudinal beam 121 located between the first cell module 21 and the second cell module 22 and a second longitudinal beam 122 located between the second cell module 22 and the third cell module 23. The longitudinal cell assembly 24 is disposed in the receiving channel of the first longitudinal beam 121. The short blade battery pack also includes several second limiting plates 30. The second limiting plates 30 are provided between one side plate of the first longitudinal beam 121 and the first cell module 21, and between the other side plate of the first longitudinal beam 121 and the second cell module 22. The second limiting plates 30 on both sides are used to limit the longitudinal cell assembly 24 along the Y direction.

[0050] Since the upper part of the first longitudinal beam 121 is an open structure, and the longitudinal battery cell assembly 24 is arranged in the first longitudinal beam 121, it is necessary to limit the longitudinal battery cell assembly 24. By setting the second limiting plates 30 on both sides of the first longitudinal beam 121 away from the receiving channel, the longitudinal battery cell assembly 24 can be limited in the Y direction to prevent the battery cells from expanding after expansion.

[0051] In some embodiments, a top cover is also included, which is adapted to cooperate with the frame 11 of the housing 1. The top cover is used to close the top opening of the housing 1. The top cover and the bottom plate of the housing 1 form a limit on the cell module and the longitudinal cell assembly 24 along the Z direction. The second limiting plate 30 is a detachable structure; or, the second limiting plate 30 is connected to the top cover.

[0052] The second limiting plate 30 can be installed in a detachable manner between the cell module and the longitudinal beam 12 after the cell module and the longitudinal cell assembly 24 are placed. Alternatively, the second limiting plate 30 can be placed on the top cover, and when the top cover is assembled, the second limiting plate 30 is embedded between the cell module and the longitudinal beam 12.

[0053] In some embodiments, an insulating heat insulation element is provided between the two side plates of the longitudinal cell assembly 24 and the longitudinal beam 12.

[0054] By installing an insulating and heat-insulating component between the two side plates of the longitudinal cell assembly 24 and the longitudinal beam 12, the longitudinal cell assembly 24 can achieve the effect of insulation and heat insulation when thermal runaway occurs, thus preventing the further spread of thermal runaway.

[0055] In some embodiments, the cell module and the tandem cell assembly 24 are both composed of a plurality of blade cells 210 with a length of 400mm. The blade cells 210 are either bottom-out explosion-proof valve structures or side-out explosion-proof valve structures.

[0056] Specifically, the blade battery cell 210 has two large surfaces 2102, a bottom surface 2103, a top surface, and two side surfaces 2104. The bottom-mounted explosion-proof valve structure, such as... Figure 7 As shown, an explosion-proof valve 2101 is installed on the bottom surface 2103 of the blade cell 210. The explosion-proof valve structure is as follows: Figure 8 As shown, an explosion-proof valve 2101 is provided on the side 2104 of the blade cell 210. Regardless of the structure of the blade cell 210, it is suitable for the short blade battery pack provided in this embodiment of the present invention. The gap between the cell cover plate of the cell module and the longitudinal beam 12 is H, and the gap between adjacent cell cover plates in the longitudinal cell assembly 24 is L.

[0057] The first cell design uses a side-vented explosion-proof valve structure. To ensure safe and smooth venting in the event of thermal runaway, the gap H needs to be increased according to design requirements. A safe and reliable venting gap L also needs to be provided.

[0058] The second cell design uses cells with a bottom-out explosion-proof valve structure. The gaps H and L only need to meet the assembly gap requirements. In this case, the values ​​of H and L are smaller than those in the first cell design. The appropriate cell design can be selected based on the width of the battery pack.

[0059] The short-blade battery pack provided in this embodiment of the utility model can achieve compatibility with different schemes by simply adjusting the position of the high voltage interface and the copper busbar of the cell module for the odd-even string cell module scheme, and the component commonality rate is high.

[0060] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A short-blade battery pack, characterized in that, include: The enclosure is a semi-enclosed structure with an open top. The enclosure includes a frame and two longitudinal beams. The two longitudinal beams are arranged along the X direction and divide the area within the frame into three parallel module receiving areas. The longitudinal beams have receiving channels that run through their length. Three battery cell modules, namely a first battery cell module, a second battery cell module, and a third battery cell module; the three battery cell modules are arranged side by side in three module receiving areas; the battery cells in the battery cell modules are arranged along the Y direction; A tandem cell assembly is disposed within the receiving channel of one of the longitudinal beams, wherein the cells in the tandem cell assembly are arranged along the X direction; The electrical wiring harness is housed within a receiving channel of another of the longitudinal beams; The vertically arranged cell assembly, the first cell module, the second cell module, and the third cell module are connected in series, with the positive and negative terminals respectively led out from the same side of the vertically arranged cell assembly and the third cell module.

2. The short-blade battery pack according to claim 1, characterized in that, The rear end of the enclosure is provided with an electrical compartment, and a high-voltage distribution box is provided inside the electrical compartment. The main positive terminal and the main negative terminal are both located on the side close to the electrical compartment. The main positive terminal is connected to the positive terminal of the high-voltage distribution box through a first copper busbar, and the main negative terminal is connected to the negative terminal of the high-voltage distribution box through a second copper busbar.

3. The short-blade battery pack according to claim 2, characterized in that, The first battery cell module and the second battery cell module are connected in series via a third copper busbar, and the third copper busbar and the second copper busbar are arranged across each other.

4. The short-blade battery pack according to any one of claims 1 to 3, characterized in that, The housing also includes a bottom plate located at the bottom of the frame, and the longitudinal beam includes two side plates. The bottom of the side plates is fixedly connected to the bottom plate of the frame, and the gap between the two side plates forms the receiving channel.

5. The short-blade battery pack according to any one of claims 1 to 3, characterized in that, The number of cells in the first cell module and the third cell module is N, the number of cells in the second cell module is N-1, and an interface assembly gap is left between the second cell module and the front end of the frame. The short-blade battery pack also includes a low-voltage interface and a front-drive high-voltage interface, wherein the low-voltage interface and the front-drive high-voltage interface are located in the interface assembly gap and extend from the interface assembly gap to the outside of the frame.

6. The short-blade battery pack according to claim 5, characterized in that, It also includes at least one first limiting plate, which is disposed in the interface assembly gap and abuts against the frame and the second cell module.

7. The short-blade battery pack according to any one of claims 1 to 3, characterized in that, The two longitudinal beams are a first longitudinal beam located between the first battery cell module and the second battery cell module, and a second longitudinal beam located between the second battery cell module and the third battery cell module. The tandem battery cell assembly is disposed within the receiving channel of the first longitudinal beam. The short-blade battery pack also includes several second limiting plates; the second limiting plates are provided between one side plate of the first longitudinal beam and the first cell module, and between the other side plate of the first longitudinal beam and the second cell module. The second limiting plates on both sides are used to limit the longitudinal cell assembly along the Y direction.

8. The short-blade battery pack according to claim 7, characterized in that, It also includes a top cover, which is adapted to fit with the frame of the housing, and the top cover is used to close the top opening of the housing. The top cover and the bottom plate of the housing form a limit on the cell module and the longitudinal cell assembly along the Z direction. The second limiting plate is a detachable structure. Alternatively, the second limiting plate is connected to the top cover.

9. The short-blade battery pack according to claim 8, characterized in that, Insulating and heat-insulating components are provided between the longitudinal battery cell assembly and the two side plates of the longitudinal beam.

10. The short-blade battery pack according to any one of claims 1 to 3, characterized in that, Both the battery cell module and the longitudinal battery cell assembly are composed of multiple blade batteries with a length of 400mm. The blade battery cell has a bottom-out explosion-proof valve structure or a side-out explosion-proof valve structure.

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