A thermoelectrically separated power battery pack and a car

Abstract

This invention provides a thermoelectrically separated power battery pack, comprising: a cell module including multiple individual cells; an insulating sheet with multiple insulating through-holes; a circuit integrator disposed on the insulating sheet; and an insulating snap-on cover that is snapped onto the cell module, with multiple insulating through-holes on one side of the cover; wherein each individual cell is provided with an explosion-proof valve, and the insulating through-holes correspond to the explosion-proof valves; when the insulating snap-on cover is snapped onto the cell module, the insulating through-holes communicate with the insulating through-holes. Through this thermoelectrically separated power battery pack and the vehicle disclosed in this invention, thermoelectric separation of the power battery pack can be achieved, improving the safety of the power battery pack.

Description

Technical Field

[0001] This invention relates to the field of battery safety protection technology, and in particular to a thermoelectrically separated power battery pack and an automobile. Background Technology

[0002] With the development of the new energy vehicle industry, people have higher and higher requirements for the performance of power battery packs. However, due to the modular integration method, the existing power battery packs are large in size and weight, making it impossible to achieve lightweight development. Moreover, when the existing power battery packs experience thermal runaway, the electrolyte in the individual cells will be sprayed onto other electrical components under the action of internal pressure, which can easily lead to short circuits in electrical components and cause secondary thermal runaway. This is not conducive to improving the overall safety performance of the power battery pack and poses a significant safety hazard. Summary of the Invention

[0003] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a power battery pack and automobile with thermoelectric separation, which realizes thermoelectric separation of the power battery pack and improves the safety of the power battery pack.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0005] This invention provides a thermoelectrically separated power battery pack, comprising:

[0006] A cell module is disposed inside a battery pack housing, and the cell module includes multiple individual cells.

[0007] An insulating sheet is disposed on the battery cell module, and the insulating sheet is provided with multiple isolation through holes;

[0008] A circuit integrator is disposed on the insulating sheet; and

[0009] An insulating snap-on cover is provided on one side of the circuit integrator. The insulating snap-on cover is snapped onto the battery cell module in a wrapping manner, and one side of the insulating snap-on cover is provided with multiple insulating through holes.

[0010] The individual battery cell is equipped with an explosion-proof valve, and the isolation through hole corresponds to the explosion-proof valve. When the insulating buckle cover is snapped onto the battery cell module, the insulating through hole is connected to the isolation through hole.

[0011] In one embodiment of the present invention, the power battery pack further includes:

[0012] The power battery pack also includes:

[0013] Battery pack casing;

[0014] A liquid cooling plate is disposed on the battery pack housing, and the cell module is disposed on the liquid cooling plate;

[0015] A module isolation plate is disposed between two adjacent battery cell modules;

[0016] Multiple extrusion plates are symmetrically arranged on both sides of two adjacent battery cell modules to achieve extrusion and fastening of the individual battery cells within the battery cell modules; and

[0017] A busbar is symmetrically disposed on the battery cell module, and the busbar is located between the battery cell module and the insulating snap cover.

[0018] In one embodiment of the present invention, the battery cell module is provided with multiple cells.

[0019] In one embodiment of the present invention, two adjacent individual cells of the cell module are bonded together.

[0020] In one embodiment of the present invention, the individual battery cell is further provided with a terminal post, and the polarities of the terminals of two adjacent individual battery cells on one side of the battery cell module are opposite.

[0021] In one embodiment of the present invention, the module isolation plate is provided with at least one to achieve heat insulation and flame retardancy between two adjacent battery cell modules.

[0022] In one embodiment of the present invention, the insulating sheet is symmetrically disposed on the cell module to achieve isolation and insulation between the circuit integrator and the individual cell.

[0023] In one embodiment of the present invention, the diameter of the isolation through hole is greater than or equal to the diameter of the explosion-proof valve, and the diameter of the insulation through hole is greater than or equal to the diameter of the isolation through hole.

[0024] In one embodiment of the present invention, the busbar is electrically connected to the individual battery cell.

[0025] The present invention also provides an automobile comprising at least one thermoelectrically separated power battery pack as described in any of the above claims.

[0026] As described above, the present invention provides a power battery pack with thermoelectric separation and an automobile. An insulating sheet is provided to insulate and isolate the individual battery cells and circuit integrators, and an insulating snap-on cover is provided to insulate and protect the busbars from the outside environment. By providing isolation through-holes and insulating through-holes corresponding to the explosion-proof valves of the individual battery cells on the insulating sheet and the insulating snap-on cover, the electrolyte of the individual battery cells can flow smoothly through the isolation through-holes and insulating through-holes. This separation of the electrolyte of the individual battery cells from the surrounding electrical components achieves thermoelectric separation of the power battery pack, reduces the production cost of the power battery pack, improves the safety of the power battery pack, and further enhances the safety performance of the automobile. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 The diagram shown is an overall structural schematic of a thermoelectrically separated power battery pack according to the present invention.

[0029] Figure 2 The diagram shown is an exploded view of a cell module of a thermoelectrically separated power battery pack according to the present invention.

[0030] Figure 3 Displayed as Figure 2 A schematic diagram of a partial structure;

[0031] Figure 4 Displayed as Figure 3 A magnified view of part A in the image.

[0032] Component designation explanation:

[0033] 100. Power battery pack; 110. Battery pack casing; 120. Liquid cooling plate;

[0034] 130. Battery cell module; 131. Single battery cell; 132. Extruded plate; 133. Terminal post; 134. Explosion-proof valve;

[0035] 140. Module isolation plate; 150. Insulating sheet; 151. Isolation through hole;

[0036] 160. Busbar; 170. Circuit integrator; 180. Insulating snap cover; 181. Insulating through hole. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figure 1 As shown, the present invention provides a thermoelectric separation power battery pack that can be applied in automobiles. The thermoelectric separation power battery pack can achieve thermoelectric separation in the event of thermal runaway of the battery pack, thereby improving the safety of the power battery pack.

[0039] Please see Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the power battery pack 100 may include, but is not limited to, a battery pack housing 110, a liquid cooling plate 120, a cell module 130, a module isolation plate 140, an insulating sheet 150, a busbar 160, a circuit integrator 170, and an insulating snap-on cover 180. The battery pack housing 110 may be a hollow cuboid or a hollow cube, but is not limited to these shapes; it may also have other shapes. The liquid cooling plate 120 may be fixedly connected inside the battery pack housing 110, and a cell module 130 may be provided on one side of the liquid cooling plate 120 for cooling the cell module 130. Specifically, the cell module 130 may be fixedly connected to one side of the liquid cooling plate 120 using structural thermally conductive adhesive, but is not limited to this; the cell module 130 may also be connected to the liquid cooling plate 120 in other ways.

[0040] Please see Figure 1 and Figure 2As shown, it is worth noting that the number of cell modules 130 can be one, two, or four, but is not limited to these. Other numbers of cell modules 130 are also possible, as long as at least one cell module 130 is present. Adjacent cell modules 130 can be fixedly connected via module isolation plates 140 to achieve heat insulation and flame retardancy between adjacent cell modules 130. When there are multiple cell modules 130, they can be arranged in pairs within the battery pack housing 110 via module isolation plates 140. However, this is not limited to these arrangements; multiple cell modules 130 can also be arranged irregularly within the battery pack housing 110 via module isolation plates 140. For example, an example can be given where four cell modules 130 are arranged evenly within the battery pack housing 110. Four battery cell modules 130 can be arranged in two rows and two columns, with the distance between adjacent battery cell modules 130 being the same. However, this is not a limitation; the four battery cell modules 130 can also be arranged in other ways. The battery cell module 130 may include, but is not limited to, individual battery cells 131, extrusion plates 132, terminals 133, and explosion-proof valves 134. Specifically, multiple individual battery cells 131 can be provided, and these cells can be stacked sequentially with the surface containing the largest cross-section as the mating surface to form a module-free battery cell module 130. This reduces the integration cost of individual battery cells 131 and achieves lightweight development of the battery cell module 130. For example, adjacent individual battery cells 131 within the battery cell module 130 can be fixedly connected using structural adhesive to fix multiple individual battery cells 131 together in parallel, forming a module-free battery cell module 130. Furthermore, the polarities of the terminals 133 on the same side of adjacent individual battery cells 131 within the battery cell module 130 can be opposite. Each individual battery cell 131 can be equipped with a terminal post 133 and an explosion-proof valve 134. Specifically, the terminal posts 133 can be symmetrically arranged on both sides of the individual battery cell 131, and the polarities of the terminal posts 133 on both sides of the individual battery cell 131 are opposite. The explosion-proof valve 134 can be located on one side of the individual battery cell 131 to prevent the individual battery cell 131 from exploding due to excessive internal pressure. Multiple extrusion plates 132 can be provided, and the extrusion plates 132 are symmetrically arranged on two individual battery cells 131 on both sides of two adjacent battery cell modules 130 to extrude and fasten the individual battery cells 131 in the battery cell module 130. This allows for control of the length and width of the battery cell module 130, and enables module-less integration of the battery cell module 130 through the extrusion and fastening of the individual battery cells 131.

[0041] Please see Figure 1 and Figure 2As shown, specifically, the number of cell modules 130 can be set to four, and adjacent cell modules 130 can be fixedly connected by module isolation plates 140 to achieve heat insulation and flame retardancy between adjacent cell modules 130. The four cell modules 130 can be arranged in pairs within the battery pack housing 110 via the module isolation plates 140, in a two-row, two-column arrangement, with the distance between adjacent cell modules 130 being equal. However, this is not the only limitation; other numbers of cell modules 130 can be arranged within the battery pack housing 110, and the cell modules 130 can also be arranged in other ways. The battery module 130 may include multiple individual battery cells 131, and these individual cells 131 can be stacked and connected sequentially with the surface containing the largest cross-section as the bonding surface. Adjacent individual cells 131 can be fixedly connected by structural adhesive to form a moduleless battery module 130, thereby reducing the integration cost of individual battery cells 131 and achieving lightweight development of the battery module 130. However, this is not the only limitation; adjacent individual cells 131 can also be fixedly connected by other methods. In addition, the polarities of the terminals 133 on the same side of adjacent individual cells 131 within the battery module 130 need to be set to opposite, that is, the polarities of adjacent terminals 133 on the same side of adjacent individual cells 131 are one positive terminal and the other negative terminal. Multiple extrusion plates 132 are provided, and the extrusion plates 132 are symmetrically arranged on two individual cells 131 on both sides of two adjacent cell modules 130 to extrude and fasten the individual cells 131 in the cell module 130, so as to control the length and width of the cell module 130, and to achieve moduleless integration of the cell module 130 by extruding and fastening the individual cells 131.

[0042] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, it should be noted that the insulating sheet 150 can be symmetrically arranged on both sides of the cell module 130. For example, the insulating sheet 150 can be located on the same side as the explosion-proof valve 134 of the individual cell 131, and the insulating sheet 150 is fixedly connected to the individual cell 131. The insulating sheet 150 can be a blister pack, and it can be attached to the position of the individual cell 131 without the terminal post 133 by adhesive backing, for insulating the cell module 130. The insulating sheet 150 may have multiple isolation through holes 151. When the insulating sheet 150 is attached to the individual battery cell 131, the isolation through holes 151 correspond to the explosion-proof valve 134 of the individual battery cell 131, and the diameter of the isolation through holes 151 is greater than or equal to the diameter of the explosion-proof valve 134. This allows the electrolyte flowing out from the explosion-proof valve 134 of the individual battery cell 131 to flow out through the isolation through holes 151, preventing the electrolyte from flowing to electrical components near the insulating sheet 150, thus facilitating thermoelectric separation. However, this is not the only possibility; the insulating sheet 150 may also be symmetrically arranged on both sides of the battery cell module 130 in other ways.

[0043] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the busbar 160 can be electrically connected to the terminal 133 within the cell module 130, and the busbar 160 and the insulating sheet 150 can be located on the same side of the cell module 130 to achieve series connection of the individual cells 131 within the cell module 130. Specifically, the busbar 160 can be soldered to the terminal 133 of the individual cell 131, but it is not limited to this; the busbar 160 can also be electrically connected to the terminal 133 through other connection methods. A circuit integrator 170 is also provided on one side of the insulating sheet 150, and the circuit integrator 170 is electrically connected to the busbar 160. The cell module 130 and the circuit integrator 170 can be isolated and insulated by the insulating sheet 150 to prevent the circuit integrator 170 from interfering with the cell module 130. However, this is not the only option. The battery module 130 and the circuit integrator 170 can be isolated and insulated from each other using other methods, as long as isolation and insulation between them can be achieved. Specifically, the circuit integrator 170 can be attached to one side of the insulating sheet 150 using adhesive, or it can be fixedly attached to one side of the insulating sheet 150 using other methods. Furthermore, the circuit integrator 170 can be electrically connected to the bus 160 by soldering. The circuit integrator 170 can be a flexible printed circuit board (FPC), but it is not limited to this; it can also be other types of integrators, as long as they can receive the voltage signal output from the bus 160.

[0044] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, further, an insulating snap-on cover 180 can be provided on one side of the busbar 160. Multiple insulating snap-on covers 180 can be provided, and they can be symmetrically snapped onto both sides of the cell module 130 to provide insulation protection for the busbar 160. The shape of the insulating snap-on cover 180 can be approximately U-shaped, but is not limited to this. The shape of the insulating snap-on cover 180 can also be other shapes, as long as the insulating snap-on cover 180 can be snapped onto the cell module 130 and achieve thermal and electrical separation of the power battery pack 100. For example, when the shape of the insulating snap-on cover 180 is approximately U-shaped, the insulating snap-on cover 180 can be rotated 90° clockwise and then snapped onto the cell module 130. However, it is not limited to this; the insulating snap-on cover 180 can also be snapped onto the cell module 130 in other ways to achieve insulation isolation between the cell module 130 and the outside world. Furthermore, the insulating snap cover 180 may be provided with multiple insulating through holes 181. When the insulating snap cover 180 is fully snapped onto the cell module 130, the insulating through holes 181 and the isolation through holes 151 are interconnected, and the diameter of the insulating through holes 181 is greater than or equal to the diameter of the isolation through holes 151. This allows the electrolyte passing through the isolation through holes 151 to spray out from the insulating through holes 181, preventing the electrolyte from penetrating into the electrical components between the cell module 130 and the insulating snap cover 180 and causing a short circuit, thereby achieving thermal and electrical separation of the power battery pack 100. Specifically, the insulating snap cover 180 can be made of polycarbonate (PC) material, but it is not limited to this. The insulating snap cover 180 can also be made of other types of materials, as long as it can provide insulation for the busbar 160 and achieve thermal and electrical separation of the power battery pack 100.

[0045] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the present invention also provides an automobile, which may include, but is not limited to, a power battery pack 100, and the power battery pack 100 is provided with at least one to provide power to the automobile. Specifically, when assembling the power battery pack 100, the liquid cooling plate 120 is first fixedly connected to the battery pack housing 110, and two adjacent cell modules 130 are fixedly connected using a module isolation plate 140. Then, the insulating sheet 150 is symmetrically attached to the cell module 130, and the isolation through hole 151 on the insulating sheet 150 corresponds to the explosion-proof valve 134 on the individual cell 131 to achieve initial thermoelectric separation. Next, the busbar 160 is electrically connected to the terminal 133 of the cell module 130 to achieve series connection of the individual cells 131. Then, the circuit integrator 170 is placed on the insulating sheet 150 to achieve insulation isolation between the circuit integrator 170 and the individual cells 131. The busbar 160 is electrically connected to the circuit integrator 170 to send the series voltage collected by the busbar 160 to the circuit integrator 170. Subsequently, the insulating snap-on cover 180 is wrapped and snapped onto the cell module 130, and the insulating hole 181 and the isolation hole 151 are interconnected. Finally, the integrated moduleless cell module 130 is fixedly pasted onto the liquid cooling plate 120 with structural thermally conductive adhesive, and the battery pack top cover is fixedly connected to the battery pack housing 110 to complete the assembly of the power battery pack 100 and achieve thermal and electrical separation of the power battery pack 100.

[0046] In summary, the thermally and electrically separated power battery pack and automobile provided by this invention utilizes insulating sheets to insulate individual battery cells and circuit integrators, insulating clips to protect the busbars from external sources, and insulating through-holes and insulating through-holes corresponding to the explosion-proof valves of individual battery cells on the insulating sheets and insulating clips. This ensures that the electrolyte of the individual battery cells can flow smoothly through the insulating through-holes and insulating through-holes, separating the electrolyte of the individual battery cells from the electrical components surrounding them. This achieves thermal and electrical separation of the power battery pack, reduces the production cost of the power battery pack, improves the safety of the power battery pack, and further enhances the safety performance of the automobile.

[0047] In the description of this specification, the references to terms such as "this embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] The embodiments of the present invention disclosed above are merely illustrative of the invention. The embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A power battery pack with thermoelectric separation, characterized in that, The power battery pack includes: A cell module is located inside the battery pack housing. The cell module includes multiple individual cells. The cell module adopts a module-free integration method. Adjacent individual cells are fixedly connected by structural adhesive. An insulating sheet is disposed on the battery cell module, and the insulating sheet is provided with multiple isolation through holes; A circuit integrator is disposed on the insulating sheet; and An insulating snap-on cover is provided on one side of the circuit integrator. The insulating snap-on cover is snapped onto the battery cell module in a wrapping manner, and one side of the insulating snap-on cover is provided with multiple insulating through holes. Multiple extrusion plates are symmetrically arranged on both sides of two adjacent cell modules to extrude and fasten the individual cells within the cell modules, thereby obtaining the moduleless power battery pack. The individual battery cell is equipped with an explosion-proof valve, and the isolation through hole corresponds to the explosion-proof valve. When the insulating buckle cover is snapped onto the battery cell module, the insulating through hole is connected to the isolation through hole.

2. The thermoelectrically separated power battery pack according to claim 1, characterized in that, The power battery pack also includes: Battery pack casing; A liquid cooling plate is disposed on the battery pack housing, and the cell module is disposed on the liquid cooling plate; A module isolation plate is disposed between two adjacent battery cell modules; and A busbar is symmetrically disposed on the battery cell module, and the busbar is located between the battery cell module and the insulating snap cover.

3. The thermoelectrically separated power battery pack according to claim 1, characterized in that, The battery cell module has multiple components.

4. The thermoelectrically separated power battery pack according to claim 3, characterized in that, The adjacent individual cells of the cell module are bonded together.

5. The thermoelectrically separated power battery pack according to claim 4, characterized in that, Each individual battery cell is also provided with a terminal post, and the polarities of the terminals of two adjacent individual battery cells on one side of the battery cell module are opposite.

6. The thermoelectrically separated power battery pack according to claim 2, characterized in that, The module isolation plate is provided with at least one to achieve heat insulation and flame retardancy between two adjacent battery cell modules.

7. The thermoelectrically separated power battery pack according to claim 1, characterized in that, The insulating sheets are symmetrically arranged on the cell module to achieve isolation and insulation between the circuit integrator and the individual cell.

8. The thermoelectrically separated power battery pack according to claim 1, characterized in that, The diameter of the isolation through hole is greater than or equal to the diameter of the explosion-proof valve, and the diameter of the insulation through hole is greater than or equal to the diameter of the isolation through hole.

9. The thermoelectrically separated power battery pack according to claim 2, characterized in that, The busbar is electrically connected to the individual battery cell.

10. A car, characterized in that, It includes at least one thermoelectrically separated power battery pack as described in any one of claims 1-9.

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