A blade battery device

Abstract

The present invention provides a blade battery device, which includes: a shell assembly, a cell assembly and a reinforcement. The shell assembly includes a shell body, a positive cover plate, a negative cover plate and a receiving space. The positive cover plate and the negative cover plate are respectively installed at both ends of the shell body to form a receiving space. The cell assembly includes a cell body, a positive electrode tab and a negative electrode tab. The positive electrode tab and the negative electrode tab are respectively provided at both ends of the cell body. The cell body is installed in the receiving space. A through-hole structure is provided in the cell body and the shell. The reinforcement is provided in the through-hole structure in the cell body. The blade battery device includes: blade batteries and a pipe assembly. The blade batteries are stacked in sequence, and the pipe assembly passes through the interior of the reinforcement. The present invention increases the structural strength of the blade battery by arranging the reinforcement in the through-hole structure of the cell body, while improving space utilization while ensuring safety.

Description

Technical Field

[0001] The present invention relates to a battery structure, in particular to a blade battery device. Background Art

[0002] Traditional new energy power battery solutions involve preparing battery cells into modules according to matching standards, and then combining these modules through packaging to create a battery pack that meets vehicle requirements. To further enhance the range of electric vehicles, efforts are underway to improve design, reduce auxiliary material consumption, and increase battery pack space utilization.

[0003] CTP (Cell to Pack) technology is one of the major technological developments in the power battery industry. Its most notable feature is that it bypasses the module manufacturing process and instead directly packages cells into vehicle-ready battery packs. CTP reduces the cost of connecting modules in series, improving battery pack space utilization and ultimately increasing the range of electric vehicles. The emergence and development of CTP technology is closely linked to the emergence and development of blade batteries. Blade batteries are lithium-ion batteries with a large aspect ratio. Compared to traditional aluminum-cased power batteries, blade batteries are relatively thin (typically 10mm-20mm) and relatively long (typically over 500mm). When assembled in a complete package, the width of the blade battery aligns with the height of the battery pack, forming a vertical orientation. The cells are stacked parallel to each other. Limited by the internal height of the battery pack, the width of the blade battery is 105mm-115mm.

[0004] The basic structure of a blade battery consists of a metal / aluminum casing with openings at both ends, a positive electrode cover, a negative electrode cover, a bare cell made up of stacked or wound positive and negative electrode sheets, and a separator, along with auxiliary materials such as Maylar film to prevent short circuits and sealing pins. The positive and negative tabs of the bare cell are welded to the positive and negative electrode covers, respectively. The covers are then laser-welded to the openings of the aluminum casing, finalizing the overall cell structure. This densely packed structure fully utilizes the space within the battery pack, improving range.

[0005] However, the weak structural strength of blade batteries has always been an application problem in this field. Due to its long structure, problems such as poor cell flatness and large thickness tolerance often occur during actual operation. Moreover, if fire protection design is introduced into passenger car-grade battery packs, it will greatly squeeze the internal space of the battery pack, affect the space utilization of the battery pack, and sacrifice the cruising range of the passenger car. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a blade battery device for solving the problem of low structural strength of blade batteries in the prior art. It mainly involves improving the structural design of the blade battery, providing a through hole in the middle of the blade battery, and a reinforcement at the position of the through hole connecting the first side wall and the second side wall, so as to increase the structural strength of the blade battery.

[0007] The present invention provides a blade battery device, comprising: a blade battery, wherein a plurality of the blade batteries are stacked in sequence; and a pipe assembly, wherein the pipe assembly passes through reinforcement members of the plurality of stacked blade batteries.

[0008] In one embodiment of the present invention, the pipe wall of the pipe component is made of a fusible material, and the melting point of the pipe component is 100°C-200°C.

[0009] In one embodiment of the present invention, a fire-proof blocking material is provided inside the pipe assembly. When the temperature of the blade battery is higher than the melting threshold of the pipe wall, the pipe wall will melt and release the fire-proof blocking material provided inside.

[0010] The Blade Battery includes:

[0011] A shell assembly, the shell assembly includes a shell body, a positive electrode cover plate and a negative electrode cover plate, the shell body includes two oppositely arranged first side walls and a second side wall, a third side wall and a fourth side wall connected between the first side wall and the second side wall and oppositely arranged, the first side wall, the second side wall, the third side wall and the fourth side wall are connected and closed to each other to form a receiving space that passes through the shell assembly, the area of ​​the first side wall and the second side wall is larger than the area of ​​the third side wall and the fourth side wall, and a first shell reinforcement hole and a second shell reinforcement hole aligned with each other are respectively provided on the first side wall and the second side wall; a battery cell assembly, the battery cell assembly is arranged in the receiving space of the shell assembly, the battery cell assembly includes a battery cell body provided with a pole core reinforcement hole, the pole The core reinforcement hole passes through the first surface and the second surface of the battery cell body; the reinforcement member includes a first end and a second end arranged opposite to the first end; wherein, when the battery cell assembly is accommodated in the accommodating space of the shell assembly, the first surface and the second surface of the battery cell assembly are respectively parallel to the first side wall and the second side wall of the shell assembly, and the pole core reinforcement hole is aligned with the first reinforcement hole and the second reinforcement hole of the shell; the reinforcement member penetrates the pole core reinforcement hole of the battery cell assembly, and the first reinforcement hole and the second reinforcement hole of the shell assembly, and the first end of the reinforcement member is fixedly connected to the first side wall of the shell assembly, and the second end is fixedly connected to the second side wall of the shell assembly.

[0012] In one embodiment of the present invention, the reinforcement is a hollow structure.

[0013] In one embodiment of the present invention, the reinforcement is welded to the shell assembly.

[0014] In one embodiment of the present invention, the housing assembly further includes a positive electrode column and a negative electrode column, the positive electrode column is fixedly connected to the positive electrode cover plate, and the negative electrode column is fixedly connected to the negative electrode cover plate.

[0015] In one embodiment of the present invention, the battery cell assembly further includes a positive electrode tab and a negative electrode tab, wherein the positive electrode tab is provided at one end of the battery cell body, and the negative electrode tab is provided at the other end away from the positive electrode tab.

[0016] In one embodiment of the present invention, the positive electrode post is electrically connected to the positive electrode tab through the positive electrode cover, the negative electrode post is electrically connected to the negative electrode tab through the negative electrode cover, and the battery cell body outputs the stored electricity through the positive electrode post and the negative electrode post.

[0017] In one embodiment of the present invention, there is a distance of 0.5 mm to 2 mm between adjacent blade batteries.

[0018] The present invention provides a blade battery device, which can improve the battery module structure and install a reinforcement member in a pole core reinforcement hole provided in the blade battery to increase the structural strength.

[0019] Furthermore, the blade battery device of the present invention can pass the pipe assembly through the interior of the reinforcement, and when the temperature of the blade battery is too high, the pipe assembly can release fire-fighting substances to suppress the fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a schematic exploded perspective view of a blade battery in one embodiment of the present invention;

[0022] Figure 2 A perspective schematic diagram of a blade battery in one embodiment of the present invention;

[0023] Figure 3 A perspective schematic diagram of blade battery stacking in one embodiment of the present invention;

[0024] Figure 4This is a three-dimensional schematic diagram of adjacent blade batteries connected by a pipe assembly in one embodiment of the present invention;

[0025] Figure 5 FIG. 1 is a perspective schematic diagram of a blade battery device according to an embodiment of the present invention.

[0026] Component number description:

[0027] Shell assembly (10), shell body (11), positive electrode cover (12), negative electrode cover (13), positive electrode column (14), negative electrode column (15), first side wall (111), second side wall (112), third side wall (113), fourth side wall (114), receiving space (115), first reinforcement hole (116), second reinforcement hole (117), battery cell assembly (20), battery cell body (21), electrode core reinforcement hole (211), first surface (212), second surface (213), positive electrode tab (22), negative electrode tab (23), reinforcement member (30), first end (31), second end (32), blade battery device (40), pipeline assembly (50). DETAILED DESCRIPTION

[0028] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0029] It should be noted that, unless there is a conflict, the features in the following examples and embodiments may be combined with each other. It should also be understood that the terms used in the examples of the present invention are intended to describe specific embodiments and are not intended to limit the scope of protection of the present invention. The test methods in the following examples, where specific conditions are not specified, are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0030] See also Figures 1 to 5. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0031] The present invention provides a blade battery module that can improve the heat dissipation efficiency of the battery cell. Specifically, the soft-pack battery module of the present invention includes a shell assembly 10, a battery cell assembly 20 and a reinforcement 30. The shell assembly 10 includes a shell body 11, a positive electrode cover plate 12 and a negative electrode cover plate 13. The shell body 11 includes two oppositely arranged first side walls 111 and second side walls 112, and a third side wall 113 and a fourth side wall 114 connected between the first side wall 111 and the second side wall 112 and oppositely arranged. The first side wall 111, the second side wall 112, the third side wall 113 and the fourth side wall 114 are connected to each other and closed to form a receiving space 115 that passes through the shell assembly 10. The area of ​​the first side wall 111 and the second side wall 112 is larger than the area of ​​the third side wall 113 and the fourth side wall 114. The first shell reinforcement hole 116 and the second shell reinforcement hole 117 aligned with each other are respectively provided on the first side wall 111 and the second side wall 112. The cell assembly 20 is disposed in the receiving space 115 of the housing assembly 10 . The cell assembly 20 includes a cell body 21 having a core reinforcement hole 211 . The core reinforcement hole 211 passes through a first surface 212 and a second surface 213 of the cell body 21 . The reinforcement 30 includes a first end 31 and a second end 32 arranged opposite to the first end 31; wherein, when the battery cell assembly 20 is accommodated in the accommodating space 115 of the shell assembly 10, the first surface 212 and the second surface 213 of the battery cell assembly 20 are respectively parallel to the first side wall 111 and the second side wall 112 of the shell assembly 10, and the pole core reinforcement hole 211 is aligned with the first reinforcement hole 116 and the second reinforcement hole 117 of the shell; the reinforcement 30 passes through the pole core reinforcement hole 211 of the battery cell assembly 20 and the first reinforcement hole 116 and the second reinforcement hole 117 of the shell of the shell assembly 10, and the first end 31 of the reinforcement 30 is fixedly connected to the first side wall 111 of the shell assembly 10, and the second end 32 is fixedly connected to the second side wall 112 of the shell assembly 10.

[0032] like Figure 1-2As shown, the housing body 11 comprises a first side wall 111, a second side wall 112, a third side wall 113, and a fourth side wall 114, which together contain a receiving space 115. The first side wall 111, the second side wall 112, the third side wall 113, and the fourth side wall 114 sequentially surround the receiving space 115, and the adjacent side walls are fixedly connected to form a single structure by welding, integral molding, or other methods. The first side wall 111 and the second side wall 112 have equal areas and are larger than the third side wall 113 and the fourth side wall 114. At least two through-hole structures are provided on each of the first and second side walls 111, 112, namely, a first reinforcement hole 116 and a second reinforcement hole 117. The first reinforcement hole 116 and the second reinforcement hole 117 are provided on the first and second side walls 111, 112, respectively, and the positions of the first reinforcement hole 116 and the second reinforcement hole 117 correspond to each other. The housing body 11 is provided with a positive electrode cover plate 12 and a negative electrode cover plate 13 at each end. The positive electrode cover plate 12 and the negative electrode cover plate 13 are welded to the housing body 11, respectively, and the positive electrode cover plate 12 and the negative electrode cover plate 13 respectively seal the housing body 11 at both ends to achieve the effect of sealing the housing 11. The positive electrode cover plate 12 and the negative electrode cover plate 13 are made of conductive material. The positive electrode post 14 and the negative electrode post 15 are fixedly mounted on the positive electrode cover plate 12 and the negative electrode cover plate 13 respectively. The positive electrode post 14 and the negative electrode post 15 are also made of conductive material.

[0033] Furthermore, the cell body 21 has a structure corresponding to the shape of the receiving space 115 of the housing assembly 10. The cell body 21 is disposed in the receiving space 115 and welded to the housing body 11. The cell body 21 includes a first surface 212 and a second surface 213. The first surface 212 and the second surface 213 are the largest surfaces of the cell body 21 and are in close contact with the first side wall 111 and the second side wall 112 of the housing assembly 10, respectively. The cell body 21 has a positive electrode tab 22 and a negative electrode tab 23 at both ends near the positive electrode cover plate 12 and the negative electrode cover plate 13, respectively. The positive electrode tab 22 and the negative electrode tab 23 are in contact with the positive electrode cover plate 12 and the negative electrode cover plate 13, respectively. The positive electrode tab 22 and the positive electrode column 14 are electrically connected through the positive electrode cover plate 12, and the negative electrode tab 23 and the negative electrode column 15 are electrically connected through the negative electrode cover plate 13. The core reinforcement hole 211 is a through-hole structure that extends through the first and second surfaces 212 and 213 of the cell body 21. The location of the core reinforcement hole 211 corresponds to the first and second reinforcement holes 116 and 117 of the housing assembly 10. The reinforcement member 30 is a vertically extending hollow structure, with a vertical shape identical to the first and second reinforcement holes 116, 117, and core reinforcement hole 211. The end of the reinforcement member 30 closest to the first sidewall 111 of the housing assembly 10 is a first end 31, and the end of the reinforcement member 30 closest to the second sidewall 112 is a second end 32. The reinforcement member 30 is installed within the core reinforcement hole 211 of the cell assembly 20, with the first end 31 welded to the first sidewall 111 of the housing assembly 10 and the second end 32 welded to the second sidewall 112. The placement of the reinforcement member 30 within the through-hole structure shortens the length of the blade battery. The blade battery is supported by the reinforcement member 30 at the location of the core reinforcement hole 211, increasing its structural strength. At the same time, multiple reinforcement members 30 can be arranged at the same time according to actual needs. When adding reinforcement members 30, corresponding pole core reinforcement holes 211 and shell reinforcement holes also need to be added at the same time.

[0034] like Figure 2 As shown, the positive electrode post 14 is installed on the positive electrode cover plate 12, and the first side wall 111, the second side wall 112, the third side wall 113 and the fourth side wall 114 of the shell body 11 surround the receiving space 115 in sequence and are fixed by welding between adjacent side walls. The reinforcement 30 is provided and welded to the first side wall 111 and the second side wall 112 of the shell assembly 10 respectively.

[0035] The present invention provides a blade battery device, comprising a blade battery 40 and a duct assembly 50. The blade battery 40 comprises the blade battery described above, with several blade batteries 40 stacked in sequence. The duct assembly 50 is a reinforcement member 30 that passes through the stacked blade batteries 40. The duct assembly 50 can be formed by connecting the reinforcement members 30 of several battery modules end-to-end in series, or it can be a single reinforcement member 30 that simultaneously passes through several battery modules, or it can be a single tube that simultaneously passes through several battery modules and houses the reinforcement members 30 of these modules, or it can be a single tube that simultaneously passes through the reinforcement members 30 of several battery modules. The walls of the duct assembly 50 and the reinforcement member 30 are made of a readily fusible material that melts when exposed to high temperatures. The duct assembly 50 and the reinforcement member 30 are internally insulated with a fire-resistant blocking material. When the corresponding wall melts or when exposed to an open flame, the fire-resistant blocking material can suppress the spread of the fire and also cool the hot areas.

[0036] like Figure 3 As shown, when blade batteries 40 are stacked in sequence, the positions of their reinforcements 30 correspond to each other, forming a channel that can accommodate the passage of the pipe. When blade batteries 40 are stacked, there is a 0.5-2 mm gap between adjacent blade batteries 30, which reduces the risk of heat spread caused by the blade batteries 40 being too close together.

[0037] like Figure 4 In the illustrated embodiment, the duct assembly 50 is positioned within the reinforcement member 30. Two adjacent blade batteries 40 are penetrated by the same duct assembly 50 through the reinforcement member 30. The duct assembly 50 is constructed from a fusible material that melts when exposed to high temperatures. Fire-blocking material is also incorporated into the duct assembly 50 to prevent fire from spreading and cool down hot areas.

[0038] like Figure 5 In the illustrated embodiment, a pipe assembly 50 sequentially passes through a plurality of blade batteries 40 to form a blade battery assembly. When a blade battery 40 malfunctions and the temperature rises, the pipe wall of the pipe assembly 50 melts, releasing the fire-blocking material inside, precisely targeting the fire site.

[0039] The present invention increases the support points by providing a through-hole structure inside the blade battery and installing a reinforcement member in the through-hole structure, which equivalently reduces the length of the blade battery, thereby enhancing the structural strength of the blade battery.

[0040] Furthermore, the present invention also introduces a pipe assembly into the reinforcement, which can be filled with fire-proof blocking materials, and can accurately block the spread of fire when the battery device catches fire. The pipe assembly is located inside the reinforcement and does not occupy the external space of the battery device, reducing space utilization.

[0041] Therefore, the blade battery device of the present invention can achieve the effect of increasing the blade battery structure.

[0042] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A blade battery device, characterized in that: include: Blade batteries (40), wherein a plurality of blade batteries (40) are stacked in sequence; a pipe assembly (50), the pipe assembly (50) being a reinforcement member (30) passing through a plurality of stacked blade batteries (40); The pipe wall of the pipe component (50) is made of a fusible material, and the melting point of the pipe component (50) is 100°C-200°C; The pipe assembly (50) is provided with a fire-proof blocking material inside, and when the temperature of the blade battery (40) is higher than the melting threshold of the pipe wall, the pipe wall will melt and release the fire-proof blocking material provided inside; The blade battery (40) comprises: A shell assembly (10), the shell assembly (10) comprising a shell body (11), a positive electrode cover plate (12) and a negative electrode cover plate (13), the shell body (11) comprising two oppositely arranged first side walls (111) and second side walls (112), a third side wall (113) and a fourth side wall (114) connected between the first side wall (111) and the second side wall (112) and oppositely arranged, the first side wall (111), the second side wall (112), the third side wall (113) and the fourth side wall (114) being connected and closed to form a receiving space (115) penetrating the shell assembly (10), the area of ​​the first side wall (111) and the second side wall (112) being larger than the area of ​​the third side wall (113) and the fourth side wall (114), and a first shell reinforcement hole (116) and a second shell reinforcement hole (117) being aligned with each other are respectively provided on the first side wall (111) and the second side wall (112); A battery cell assembly (20), the battery cell assembly being arranged in the receiving space (115) of the housing assembly (10), the battery cell assembly (20) comprising a battery cell body (21) provided with a core reinforcement hole (211), the core reinforcement hole (211) penetrating a first surface (212) and a second surface (213) of the battery cell body (21); A reinforcement member (30), the reinforcement member (30) comprising a first end (31) and a second end (32) disposed opposite to the first end (31); Wherein, when the battery cell assembly (20) is accommodated in the accommodating space (115) of the shell assembly (10), the first surface (212) and the second surface (213) of the battery cell assembly (20) are respectively parallel to the first side wall (111) and the second side wall (112) of the shell assembly (10), and the pole core reinforcement hole (211) is aligned with the first shell reinforcement hole (116) and the second shell reinforcement hole (117); the reinforcement member (30) penetrates the pole core reinforcement hole (211) of the battery cell assembly (20), and the first shell reinforcement hole (116) and the second shell reinforcement hole (117) of the shell assembly (10), and the first end (31) of the reinforcement member (30) is fixedly connected to the first side wall (111) of the shell assembly (10), and the second end (32) is fixedly connected to the second side wall (112) of the shell assembly (10).

2. The blade battery device according to claim 1, characterized in that: The reinforcement member (30) is a hollow structure.

3. The blade battery device according to claim 1, characterized in that: The reinforcement (30) is welded to the shell assembly (10).

4. The blade battery device according to claim 1, characterized in that: The housing assembly (10) further comprises a positive pole column (14) and a negative pole column (15), wherein the positive pole column (14) is fixedly connected to the positive pole cover plate (12), and the negative pole column (15) is fixedly connected to the negative pole cover plate (13).

5. The blade battery device according to claim 4, characterized in that: The battery cell assembly (20) further comprises a positive electrode tab (22) and a negative electrode tab (23), wherein the positive electrode tab (22) is arranged at one end of the battery cell body (21), and the negative electrode tab (23) is arranged at the other end away from the positive electrode tab (22).

6. The blade battery device according to claim 5, characterized in that: The positive electrode column (14) is electrically connected to the positive electrode tab (22) through the positive electrode cover (12), the negative electrode column (15) is electrically connected to the negative electrode tab (23) through the negative electrode cover (13), and the battery cell body (21) outputs the stored electricity through the positive electrode column (14) and the negative electrode column (15).

7. The blade battery device according to claim 1, characterized in that: There is a spacing of 0.5 mm to 2 mm between adjacent blade batteries (40).

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