Battery cell stack for assembling a battery pack and an electric vehicle

Abstract

The embodiment of the utility model provides a kind of for the electric core stack of assembling battery pack and electric automobile.The electric core stack for assembling battery pack includes: multiple roll cores;As the structural main body of the electric core stack, section bar, the section bar has multiple accommodating cavities, multiple roll cores and corresponding electrolyte are placed in corresponding accommodating cavity;And multiple sealing end plates for sealing the roll core and corresponding electrolyte, the sealing end plate is provided with positive end and negative end, and the setting direction of the sealing end plate is perpendicular to the roll axis direction of the roll core.

Description

Technical Field

[0001] This invention generally relates to the field of battery technology, and more specifically, to cell stacks for assembling battery packs and electric vehicles. Background Technology

[0002] In the field of battery technology, the battery pack, as the core energy storage and output unit, is crucial in its assembly process. With the rapid development of battery technology, higher demands are being placed on high-voltage battery (HVB) technology, such as power batteries. In the development of HVBs, it is difficult to simultaneously achieve all the required performance characteristics; for example, the price of an HVB, its capacity reflecting pure electric range, and its fast-charging capability are often at odds. To resolve these contradictions, volumetric efficiency within the battery concept is paramount. Volumetric efficiency refers to the volume occupied by the battery cell compared to the overall volume of the HVB. To maximize volumetric efficiency, the HVB design must be minimized.

[0003] Among related technologies, there are already concepts such as CTP (Cell to Pack), CTB (Cell to Body), and CTC (Cell to Chassis) in an attempt to improve the volumetric efficiency of HVB design. Utility Model Content

[0004] In view of the above, this utility model provides a cell stack for assembling battery packs and an electric vehicle. Using this cell stack for assembling battery packs, a profile can be used as the main structural element to construct the cell stack. The core and corresponding electrolyte are directly placed in the receiving cavity of the profile, and the function of the traditional battery can is replaced by the cooperation between the sealing end plate and the corresponding receiving cavity. This provides a high-efficiency cell integration solution without a battery can. Furthermore, the mature extrusion profile process helps to further improve cell integration efficiency. Moreover, the cell stack provided by this utility model is applicable to various processes for assembling cells into battery packs, such as CTP, CTB, CTC, etc.; and for the aforementioned reasons, the assembled HVB typically has higher volumetric efficiency.

[0005] According to one aspect of the present invention, a cell stack for assembling a battery pack is provided, comprising: a plurality of cores; a profile serving as the structural body of the cell stack, the profile having a plurality of receiving cavities, wherein the plurality of cores and corresponding electrolytes are placed in the respective receiving cavities; and a plurality of sealing end plates for sealing the cores, the sealing end plates being provided with positive and negative ends, the sealing end plates being perpendicular to the winding direction of the cores.

[0006] According to another aspect of the present invention, an electric vehicle is provided, comprising: a battery cell stack as described above, wherein the profile serves as a vehicle structural component and is mounted under the vehicle chassis or integrated into the vehicle body structure. Attached Figure Description

[0007] A further understanding of the nature and advantages of this specification can be achieved by referring to the following figures. In the figures, similar components or features may have the same reference numerals.

[0008] Figure 1 A schematic diagram of an example of a cell stack for assembling a battery pack according to an embodiment of this specification is shown.

[0009] Figure 2 A schematic diagram of yet another example of a cell stack for assembling a battery pack according to an embodiment of this specification is shown.

[0010] Figure 3 A schematic diagram of an example of a cell module in a cell stack for assembling a battery pack according to an embodiment of this specification is shown.

[0011] Figure 4A , Figure 4B The diagram shows an example of how cell modules in a cell stack for assembling a battery pack are arranged along the thickness and width of the cell modules, according to embodiments of this specification.

[0012] Figure 5A , Figure 5B A schematic diagram of an example of a profile in a cell stack for assembling a battery pack, according to an embodiment of this specification, is shown.

[0013] Figure 6 A schematic diagram of an example of a profile unit in a cell stack for assembling a battery pack, according to an embodiment of this specification, is shown.

[0014] Figure 7 A schematic diagram of yet another example of a profile in a cell stack for assembling a battery pack, according to an embodiment of this specification, is shown.

[0015] Figure 8 A schematic diagram of yet another example of a profile unit in a cell stack for assembling a battery pack, according to an embodiment of this specification, is shown.

[0016] Figure 9 A schematic diagram of an example electric vehicle according to an embodiment of this specification is shown. Detailed Implementation

[0017] The subject matter described herein will be discussed below with reference to exemplary embodiments. It should be understood that these embodiments are discussed merely to enable those skilled in the art to better understand and implement the subject matter described herein, and are not intended to limit the scope, applicability, or examples set forth in the claims. The function and arrangement of the elements discussed may be changed without departing from the scope of the embodiments described herein. Various processes or components may be omitted, substituted, or added as needed in the various examples. Furthermore, features described in some examples may be combined in other examples.

[0018] As used herein, the term "comprising" and its variations are open terms meaning "including but not limited to". The term "based on" means "at least partially based on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other definitions, whether explicit or implicit, may be included below. Unless explicitly indicated by the context, the definition of a term shall remain consistent throughout the specification.

[0019] This specification presents an embodiment of a cell stack for assembling a battery pack and an electric vehicle. In this cell stack scheme for assembling a battery pack, a profile can be used as the main structural element to construct the cell stack. The core and corresponding electrolyte are directly placed in the receiving cavity of the profile, and the function of the traditional battery canister is replaced by the cooperation between the sealed end plate and the corresponding receiving cavity. This provides a high-efficiency cell integration scheme without a battery canister. Furthermore, the mature extrusion profile process helps to further improve cell integration efficiency, thereby increasing the volumetric efficiency of the HVB.

[0020] The following description, in conjunction with the accompanying drawings, details a cell stack for assembling a battery pack and an electric vehicle according to embodiments of this specification.

[0021] Figure 1 A schematic diagram of an example of a cell stack 100 for assembling a battery pack according to an embodiment of this specification is shown. In some examples, the cell stack 100 for assembling a battery pack according to an embodiment of this specification can be integrated and used as a power battery for an electric vehicle.

[0022] like Figure 1 As shown, the cell stack 100 may include a profile 110, a sealing end plate 140, and a jelly role 150.

[0023] In this embodiment, profile 110 can serve as the structural body of the battery cell stack 100. In some examples, profile 110 can be obtained by an extrusion process. In some examples, profile 110 can be an extruded aluminum profile. Profile 110 can have multiple receiving cavities 120 (e.g., receiving cavities 121, 122, 123, 124). In some examples, the specifications of the multiple receiving cavities can be the same.

[0024] In some examples, the dimensions of the receiving cavity 120 may match the dimensions of the core 150 placed therein. In some examples, the depth of the receiving cavity 120 may be the same as or slightly longer than the length of the core 150. In some examples, the inner width and inner height of the receiving cavity 120 may be slightly larger than the width and height of the core 150, respectively, to maximize volumetric efficiency.

[0025] In this embodiment, the sealing end plate 140 can be used to seal the winding core 150 and the corresponding electrolyte. The sealing end plate is provided with a positive terminal 141 and a negative terminal 142. The orientation of the sealing end plate 140 can be perpendicular to the winding direction of the winding core 150. In some examples, the winding core 150 can be an energy storage device for a lithium-ion battery, including a cathode layer, an anode layer, and a separator layer. Accordingly, the electrolyte is used to facilitate the conduction of electrons and lithium ions between the cathode and anode.

[0026] In this embodiment, each receiving cavity can be used to accommodate a core 150 and the corresponding electrolyte. In this embodiment, the core 150 and the corresponding electrolyte can be directly placed in the receiving cavity. At this time, the sealing end plate 140 and the corresponding receiving cavity can at least replace the function of a traditional battery can, thereby eliminating the traditional battery can structure and further improving volumetric efficiency.

[0027] In some examples, the cell stack 100 may also include a venting mechanism located on the sides, top, and / or bottom. Figure 1 (not shown in the image), thus enabling thermal management on a per-cell basis. In some examples, the heat generated by the cells can be removed by cooling the upper and / or lower parts of the profile 110.

[0028] It should be noted that, due to the obstruction of the sealing end plate 140, the core 150 is... Figure 1 It is shown in dashed lines.

[0029] It should be understood that Figure 1 The various components shown are exemplary, and embodiments of this disclosure will also cover any modifications to the examples described above. For example, a cell stack may include different numbers of cores, receiving cavities, and sealing end plates.

[0030] Figure 2 A schematic diagram of yet another example of a cell stack 200 for assembling a battery pack according to an embodiment of this specification is shown.

[0031] like Figure 2 As shown, the cell stack 200 may include multiple cell modules, such as cell modules 210, 220, 230, 240, 250, and 260. Each cell module may include a core, a profile unit, and a sealing end plate. The profile unit may have a receiving cavity. The core and the corresponding electrolyte can be placed in the receiving cavity of the profile unit, so that the profile unit can at least replace the function of a traditional battery canister. In some examples, water-cooling channels may also be provided on the frame of the profile unit. The profile units in multiple cell modules can be interconnected to form the structural body of the cell stack 200.

[0032] It should be noted that a detailed description of each part of the cell stack 200 can be found in the aforementioned references. Figure 1 The relevant descriptions of the embodiments will not be repeated here.

[0033] The above scheme forms a battery cell stack from multiple battery cell modules of the same specifications. Each battery cell module is a complete and independent unit with power supply function and thermal management support. It can be manufactured independently and can also be adapted to vehicles of different levels and models by different quantities and different arrangements, which makes it more scalable and flexible.

[0034] Figure 3 A schematic diagram of an example of a cell module 300 in a cell stack for assembling a battery pack according to an embodiment of this specification is shown. The cell module 300 can serve as... Figure 2 An example of the cell module 210 described in the embodiments. Figure 2 The description of cell module 210 in the embodiments also applies to cell module 300.

[0035] The battery cell module 300 may include a core 310, a profile unit 320, and a sealing end plate 330. The profile unit 320 may have a receiving cavity 340, in which the core 310 and the corresponding electrolyte can be placed. Figure 3 As shown, the receiving cavity 340 can directly hold the electrolyte, and the core 310 can be directly immersed in the electrolyte within the receiving cavity 340. The sealing end plate 330 is used to seal the receiving cavity 340. In this case, the profile unit 320 and the sealing end plate 330 cooperate with each other and can replace the traditional battery canister.

[0036] In some examples, water-cooling channels can be installed on the upper, lower, left, and right side frames of profile unit 320, as detailed below. Figure 6 The description.

[0037] Figure 4A , Figure 4B The diagram illustrates an example of how cell modules in a cell stack 400 for assembling a battery pack are arranged along the thickness and width of the cell modules, according to embodiments of this specification. To more clearly illustrate the placement of the cores, Figure 4A and Figure 4B The sealing end plate is not shown.

[0038] like Figure 4A As shown, the cell modules in the cell stack 400 can be arranged sequentially along the thickness of the cell modules. In some examples, the cell modules arranged sequentially along the thickness can be further stacked, for example, layered. Figure 4B As shown, the battery cell modules in the battery cell stack 400 can be arranged sequentially along the width of the battery cell module. In some examples, the battery cell modules arranged sequentially along the width can be further stacked, for example, placed in layers. In some examples, one side of the profile unit in the battery cell module can be provided with a protrusion, and the other side of the profile unit can be provided with a groove that mates with the protrusion, so that when adjacent profile units are connected, the protrusion of the latter profile unit can be precisely embedded in the groove of the former profile unit.

[0039] In some examples, the stacked cell modules can be arranged in any order along the thickness or width, provided that size requirements are met. For example, individual cell modules can be stacked vertically to form a specific stack length, or they can be stacked horizontally to form a specific stack length, thereby meeting diverse requirements for the overall length and width of the battery.

[0040] Figure 5A and Figure 5B A schematic diagram of an example of a profile 500 in a cell stack for assembling a battery pack, according to an embodiment of this specification, is shown. To more clearly illustrate the relationship between the water-cooling channels and the winding core placement state, Figure 5A The sealing end plate is not shown.

[0041] like Figure 5A As shown, profile 500 may further include water-cooling channels for cooling the receiving cavities. The direction of the water-cooling channels is consistent with the spool direction of the core. In some examples, the water-cooling channels may be disposed between adjacent receiving cavities of profile 500, such as water-cooling channels 511, 512, and 513. In some examples, the water-cooling channels may be disposed on the upper frame of profile 500, such as water-cooling channels 521, 522, 523, and 524. In some examples, the water-cooling channels may be disposed on the lower frame of profile 500, such as water-cooling channels 531, 532, 533, and 534. In some examples, the direction of the water-cooling channels may be consistent with the spool direction of the core.

[0042] In some examples, the water cooling channels of profile 500 may include Figure 5A At least one of the water-cooling channels shown, for example Figure 5B As shown. Relative to Figure 1 The profile 110 of the cell stack 100 shown is... Figure 5B The profile 500 shown also includes water-cooling channels 530 (e.g., water-cooling channels 531, 532, 533) disposed between adjacent receiving cavities. It should be noted that the location and shape of the water-cooling channels shown in FIG5 are exemplary, and other variations may be adopted.

[0043] Figure 6 A schematic diagram of an example of a profile unit 600 in a cell stack for assembling a battery pack according to an embodiment of this specification is shown. To more clearly illustrate the relationship between the water-cooling channels and the winding core placement state, Figure 6 The sealing end plate is not shown.

[0044] like Figure 6 As shown, in some examples, the water-cooling channel can be located on the upper frame of the profile unit 600, such as water-cooling channel 610. In some examples, the water-cooling channel can be located on the lower frame of the profile unit 600, such as water-cooling channel 620. In some examples, the water-cooling channel can be located on the left frame of the profile unit 600, such as water-cooling channel 630. In some examples, the water-cooling channel can be located on the right frame of the profile unit 600, such as water-cooling channel 640. In some examples, the direction of the water-cooling channel is consistent with the spool direction of the core.

[0045] It should be noted that the water cooling channel of the profile unit 600 may include Figure 6 At least one of the water-cooling channels shown.

[0046] Figure 7 A schematic diagram of yet another example of a profile 700 in a cell stack for assembling a battery pack, according to an embodiment of this specification, is shown. To more clearly illustrate the relationship between the water-cooling channels and the air-cooling fins relative to the winding core placement state, Figure 7 The sealing end plate is not shown.

[0047] like Figure 7 As shown, in some examples, the air-cooling fins can be disposed on the upper frame of the profile 700, such as air-cooling fin 710. In some examples, the air-cooling fins can be disposed on the lower frame of the profile 700, such as air-cooling fin 720.

[0048] It should be noted that the air-cooled fins of profile 700 may include Figure 7 At least one of the air-cooled fins shown.

[0049] Figure 8 A schematic diagram of yet another example of a profile unit 800 in a cell stack for assembling a battery pack, according to an embodiment of this specification, is shown. To more clearly illustrate the relationship between the water-cooling channels and the air-cooling fins relative to the winding core placement state, Figure 8 The sealing end plate is not shown.

[0050] like Figure 8 As shown, in some examples, air-cooled fins may be disposed on the upper frame of the profile unit 800, such as air-cooled fin 810. In some examples, air-cooled fins may be disposed on the lower frame of the profile unit 800, such as air-cooled fin 820.

[0051] It should be noted that the air-cooled fins of the profile unit 800 may include Figure 8 At least one of the air-cooled fins shown. It is understood that... Figure 4A , Figure 4B , Figure 5A , Figure 5B as well as Figures 6-8 The positive and negative tabs on the shown core can be connected to the positive and negative terminals set on the sealing end plate, respectively.

[0052] use Figures 1-8 The disclosed cell stack for assembling battery packs can be constructed using profiles as the main structural element. The core and corresponding electrolyte are directly placed within the cavity of the profile, and the function of the traditional battery canister is replaced by the fit between the sealed end plate and the corresponding cavity. This provides a high-efficiency cell integration solution without a battery canister, and the mature extrusion profile process further improves cell integration efficiency. Furthermore, the cell stack integration method of this solution also helps improve the volumetric efficiency of the battery pack (HVB).

[0053] Figure 9 A schematic diagram of an example of an electric vehicle 900 according to an embodiment of this specification is shown.

[0054] like Figure 9 As shown, the electric vehicle 900 may include a battery cell stack 910. The profile that serves as the structural body of the battery cell stack 910 can be used as a vehicle structural component, for example, it can be installed under the vehicle chassis or integrated into the body structure.

[0055] use Figure 9 The electric vehicle disclosed in the paper can eliminate the need for external protective devices (such as roof and underbody protection devices) required for HVB. At the same time, since extruded profiles are generally strong enough, they can also be used as passenger floor, further improving the space utilization of electric vehicles.

[0056] Reference above Figures 1 to 9This specification describes embodiments of a battery cell stack for assembling a battery pack and embodiments of an electric vehicle according to examples of these embodiments.

[0057] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. Not all units in the above system block diagrams are necessary; some units may be omitted as needed.

[0058] The term "exemplary" as used throughout this specification means "serving as an example, instance, or illustration" and does not imply that it is "preferred" or "advantageous" over other embodiments. Detailed descriptions are included for the purpose of providing an understanding of the described techniques. However, these techniques may be practiced without these detailed descriptions. In some instances, well-known structures and apparatuses are shown in block diagram form to avoid obscuring the concepts of the described embodiments.

[0059] The optional embodiments of the present specification have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present specification are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present specification, various simple modifications can be made to the technical solutions of the embodiments of the present specification, and these simple modifications all fall within the protection scope of the embodiments of the present specification.

[0060] The foregoing description of this specification is provided to enable any person skilled in the art to implement or use the content of this specification. Various modifications to the content of this specification will be apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of protection of this specification. Therefore, this specification is not limited to the examples and designs described herein, but is consistent with the widest scope of the principles and novel features disclosed herein.

Claims

1. A cell stack for assembling a battery pack, characterized in that, include: Multiple cores; The profile, which serves as the main structural component of the battery cell stack, has multiple receiving cavities, in which the multiple cores and corresponding electrolytes are placed. as well as Multiple sealing end plates are used to seal the winding core and the corresponding electrolyte. The sealing end plates are provided with positive and negative terminals, and the direction of the sealing end plates is perpendicular to the winding direction of the winding core.

2. The cell stack as described in claim 1, characterized in that, The battery includes multiple cell modules, each cell module comprising a core, a profile unit, and a sealing end plate. The profile includes multiple interconnected profile units, each profile unit having a receiving cavity. The core and corresponding electrolyte are placed in the receiving cavity of the profile unit, and the profile unit is used to replace the battery canister.

3. The cell stack as described in claim 1 or 2, characterized in that, The specifications of the plurality of receiving cavities are matched with the specifications of the core, and the profile also includes water cooling channels for cooling the receiving cavities.

4. The cell stack as described in claim 2, characterized in that, The plurality of battery cell modules are arranged in at least one of the following directions to form the battery stack: The thickness and width of the battery cell module.

5. The cell stack as described in claim 3, characterized in that, The water-cooling aisle is located at least one of the following locations: Between adjacent receiving cavities, on the frame of the profile.

6. The cell stack as described in claim 5, characterized in that, The direction of the water-cooling channel is consistent with the direction of the winding shaft of the core.

7. The cell stack as described in claim 1, characterized in that, The profile is equipped with air-cooled fins.

8. The cell stack as described in claim 1, characterized in that, It also includes exhaust mechanisms located on the side, top, and / or bottom.

9. The cell stack as described in claim 1, characterized in that, The profiles include aluminum extruded profiles.

10. An electric vehicle, characterized in that, include: The battery cell stack as described in any one of claims 1 to 9, wherein the profile is used as a vehicle structural component and is installed under the vehicle chassis or integrated into the vehicle body structure.

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