Power battery pack with inverted battery cells

Abstract

The utility model discloses a power battery pack with an inverted battery cell, which comprises a battery pack upper cover, a battery module, a battery pack lower box body and a battery pack bottom protective plate, the battery pack upper cover, the battery pack lower box body and the battery pack bottom protective plate are sequentially connected to form a cavity structure, the battery module is arranged in the cavity structure, and the battery module is arranged in the cavity structure. Battery cells in the battery pack module are inverted, an anti-collision structure is arranged between the battery cells and a battery pack bottom protection plate, and the anti-collision structure comprises energy absorption parts which are connected to the middle parts of the lower ends of the battery cells in each row and can deform and supporting parts which are connected to the lower ends of the battery cells in each row and are used for supporting the battery pack bottom protection plate to deform after being impacted. According to the battery pack provided by the invention, when the battery pack is subjected to bottom collision, the bottom collision energy is absorbed through the mutual cooperation of the battery pack bottom protection plate, the supporting piece and the energy absorption piece, so that the safety of the battery cells in the battery pack can be effectively protected.

Description

A power battery pack with inverted cells Technical Field

[0001] This utility model relates to the field of power battery pack structure technology, specifically to a power battery pack with inverted cells. Background Technology

[0002] With the global energy structure transformation and upgrading, the proportion of electric vehicles in the automotive industry has increased significantly. As the core energy storage unit of electric vehicles, the technological development of the power battery pack directly affects the vehicle's range, safety performance, and lightweighting level.

[0003] In the structural design of power battery packs, the industry currently commonly adopts the method of adding a metal bottom protective plate to the bottom of the lower casing of the power battery pack to improve its impact resistance. However, this structure is suitable for battery packs with upright cells, but not for battery packs with inverted cells, and needs to be improved. Summary of the Invention

[0004] In view of the technical problem that the structure used to improve impact resistance in the battery pack structure with upright cells as mentioned in the background art cannot be applied to the battery pack structure with inverted cells, the purpose of this utility model is to provide a power battery pack with inverted cells.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A power battery pack with inverted cells includes a battery pack top cover, a battery module, a battery pack lower housing, and a battery pack bottom protection plate. The battery pack top cover, battery pack lower housing, and battery pack bottom protection plate are sequentially connected to form a cavity structure. The battery module is disposed within the cavity structure and connected to the battery pack lower housing. The cells in the battery module are inverted. An anti-collision structure is provided between the cells and the battery pack bottom protection plate. The anti-collision structure includes a deformable energy-absorbing element connected to the middle of the lower end of each row of cells and a support element connected to the lower end of each row of cells to support the deformation of the battery pack bottom protection plate after being impacted.

[0007] Furthermore, the energy-absorbing element includes an energy-absorbing element housing and a plurality of triangular ribs disposed inside the energy-absorbing element housing.

[0008] Furthermore, the energy-absorbing component includes an energy-absorbing component housing and a honeycomb-shaped energy-absorbing body, wherein the honeycomb-shaped energy-absorbing body is disposed inside the energy-absorbing component housing.

[0009] Furthermore, the energy-absorbing component includes an energy-absorbing component housing and a plurality of vertical ribs spaced apart inside the energy-absorbing component housing.

[0010] Furthermore, the energy-absorbing component includes a combined energy-absorbing component cover and a combined energy-absorbing component body, wherein the combined energy-absorbing component cover is fitted onto the combined energy-absorbing component body; the combined energy-absorbing component body is provided with a busbar placement area for storing the busbar and a hollow structure for exposing the battery cell portion.

[0011] Furthermore, the main body of the combined energy-absorbing component is provided with multiple conical energy-absorbing buffer structures, and the upper cover of the combined energy-absorbing component is provided with circular holes that correspond one-to-one with the positions of the energy-absorbing buffer structures.

[0012] Furthermore, a first reinforcing rib and a second reinforcing rib are respectively provided on both sides of the busbar placement area.

[0013] Furthermore, the support member is I-shaped and the material of the support member is aluminum.

[0014] Furthermore, the support member is connected to the shoulder of each row of cells.

[0015] Furthermore, the bottom protective plate of the battery pack has a grid structure.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] (1) The battery pack solution provided in this application can effectively protect the safety of the battery cells inside the battery pack by absorbing the energy of the bottom impact through the cooperation of the bottom protection plate, support and energy absorption components when the battery pack is impacted from the bottom.

[0018] (2) In addition, the lower box of the battery pack has no bottom plate and is only connected to the bottom protective plate of the battery pack, which can reduce the weight of the battery pack; at the same time, the space between the shoulder of the battery cell and the bottom protective plate of the battery pack is used to arrange the energy absorption structure, which improves the space utilization of the system. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the power battery pack provided in Embodiment 1 of this application;

[0020] In the diagram, 100 is the top cover of the battery pack, 200 is the battery module, 300 is the lower casing of the battery pack, and 400 is the bottom protective plate of the battery pack.

[0021] Figure 2 is a schematic diagram of the anti-collision structure provided in Embodiment 1 of this application;

[0022] In the diagram, 101 is the battery cell, 102 is the energy-absorbing component, and 103 is the support component.

[0023] Figure 3 is a structural schematic diagram of the energy-absorbing component provided in Embodiment 1 of this application;

[0024] Figure 4 is a first schematic diagram of the structure of the energy-absorbing component provided in Embodiment 2 of this application;

[0025] In the image, 502 represents the main body of the honeycomb-shaped energy-absorbing component;

[0026] Figure 5 is a second schematic diagram of the structure of the energy-absorbing component provided in Embodiment 2 of this application;

[0027] In the diagram, 501 represents the energy-absorbing component housing;

[0028] Figure 6 is a structural schematic diagram of the energy-absorbing component provided in Embodiment 3 of this application;

[0029] Figure 7 is a first schematic diagram of the structure of the energy-absorbing component provided in Embodiment 4 of this application;

[0030] In the diagram, 701 is the top cover of the combined energy-absorbing component, 702 is the busbar, and 703 is the main body of the combined energy-absorbing component.

[0031] Figure 8 is a second schematic diagram of the structure of the energy-absorbing component provided in Embodiment 4 of this application;

[0032] Figure 9 is a structural schematic diagram of the main body of the combined energy-absorbing component provided in Embodiment 4 of this application;

[0033] In the diagram, 901 is the energy-absorbing buffer structure, 902 is the first reinforcing rib, 903 is the busbar placement area, 904 is the hollow structure, and 905 is the second reinforcing rib.

[0034] Figure 10 is a structural schematic diagram of the support member provided in an embodiment of this application;

[0035] Figure 11 is a schematic diagram of the structure of the bottom protective plate of the battery pack in Embodiment 5 of this application;

[0036] In the diagram, 401 is the longitudinal reinforcement and 402 is the transverse reinforcement. Detailed Implementation

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

[0038] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0039] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0040] It should be noted that in this embodiment, the inverted cell refers to a structure in which the cell terminals are facing downwards.

[0041] Example 1

[0042] As shown in Figures 1-3 and Figure 10, this embodiment provides a power battery pack with inverted cells, including a battery pack cover 100, a battery module 200, a battery pack lower housing 300, and a battery pack bottom protection plate 400. The battery pack cover 100, the battery pack lower housing 300, and the battery pack bottom protection plate 400 are sequentially connected to form a cavity structure. The battery module 200 is disposed within the cavity structure and connected to the battery pack lower housing 300. The cells 101 in the battery pack module 200 are inverted. An anti-collision structure is provided between the cells 101 and the battery pack bottom protection plate 400. The anti-collision structure includes a deformable energy-absorbing member 102 connected to the middle of the lower end of each row of cells 101 and a support member 103 connected to the lower end of each row of cells 101 to support the deformation of the battery pack bottom protection plate 400 after being impacted.

[0043] It should be noted that the lower casing 300 of the battery pack has openings at both the top and bottom, with the lower end only connected to the bottom protective plate 400. Figure 2 illustrates a bottom impact scenario according to this application. Energy-absorbing components are positioned in the middle of the battery cells as the primary structure to resist bottom impacts. Upon impact, the energy-absorbing component can be compressed or even collapse to absorb the impact energy. Support components are designed on the shoulders of the battery cells. These supports can be I-shaped or other shapes, serving as auxiliary structures to resist bottom impacts. The supports are made of a high-strength, low-density material, such as aluminum, to support the deformation of the bottom protective plate after impact. This solution absorbs energy during bottom impacts through the cooperation of the bottom protective plate, energy-absorbing components, and support components, preventing the battery pack from contacting the cell terminals in an inverted cell design during a bottom impact, thus improving system safety. Simultaneously, utilizing the space between the cell shoulders and the bottom protective plate for the energy-absorbing structure improves the system's space utilization.

[0044] In addition, the energy-absorbing component structure needs to be able to collapse and break when a certain impact force is reached, so the elastic modulus of the supporting structure material must be less than that of the aluminum shell of the battery cell; the energy-absorbing component structure must have reliable insulation performance; low unit weight, i.e. low density; low material unit mass cost; easy molding, i.e. low processing cost; so the material can be general engineering plastics, which can be molded by injection molding, extrusion, hot pressing, etc.

[0045] In addition, in this embodiment, the energy-absorbing component 102 comprises an energy-absorbing component housing and a plurality of triangular ribs disposed inside the energy-absorbing component housing. It should be noted that the energy-absorbing component housing can be a separable structure, such as including a cover and a box, or other structures, as long as they provide support for the triangular ribs.

[0046] Example 2

[0047] As shown in Figures 4 and 5, another embodiment of the energy-absorbing component 102 is described below: The energy-absorbing component 102 includes an energy-absorbing component housing 501 and a honeycomb-shaped energy-absorbing body 502, wherein the honeycomb-shaped energy-absorbing body 502 is disposed inside the energy-absorbing component housing 501.

[0048] Example 3

[0049] As shown in Figure 6, another embodiment of the energy-absorbing component 102 is described below: The energy-absorbing component 102 includes an energy-absorbing component housing and a plurality of vertical ribs spaced apart inside the energy-absorbing component housing.

[0050] Example 4

[0051] As shown in Figures 7-9, another embodiment of the energy-absorbing component 102 is described below: The energy-absorbing component 102 includes a combined energy-absorbing component cover 701 and a combined energy-absorbing component body 703. The combined energy-absorbing component cover 701 covers the combined energy-absorbing component body 703. The combined energy-absorbing component body 703 is provided with a busbar placement area 903 for storing the busbar 702 and a hollow structure 904 for exposing the battery cell portion.

[0052] In this embodiment, the energy-absorbing component is combined with the busbar, and the busbar is inserted into the energy-absorbing component. Compared with the independent energy-absorbing component structure, this solution can increase the coverage area of ​​the energy-absorbing component. The combined energy-absorbing components arranged in sequence can cover the entire position of the battery cell body, which can absorb more energy when it is hit from the bottom.

[0053] In addition, the main body 703 of the combined energy-absorbing component may be provided with multiple conical energy-absorbing buffer structures 901, and the upper cover 701 of the combined energy-absorbing component is provided with circular holes corresponding one-to-one with the positions of the energy-absorbing buffer structures 901. A first reinforcing rib 902 and a second reinforcing rib 905 are respectively provided on both sides of the busbar placement area 903.

[0054] In this embodiment, the main structure of the energy-absorbing component features multiple conical buffer structures that can collapse to absorb the energy emitted during a bottom impact, preventing damage to the battery cell itself and ensuring the safety of the cells inside the battery pack. Simultaneously, multiple reinforcing ribs are incorporated internally to enhance the strength of the energy-absorbing component and increase its ability to absorb impact energy. The energy-absorbing component also includes a busbar placement area, serving both to house the busbars and to provide better internal insulation, further improving safety.

[0055] Example 5

[0056] As shown in Figure 11, in the power battery pack with inverted cells provided in this embodiment, the bottom protective plate 400 of the battery pack is a grid structure, including an outer frame and longitudinal ribs 401 and transverse ribs 402 disposed in the outer frame.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A power battery pack with inverted cells, comprising a battery pack top cover (100), a battery module (200), a battery pack lower housing (300), and a battery pack bottom protective plate (400), wherein the battery pack top cover (100), the battery pack lower housing (300), and the battery pack bottom protective plate (400) are sequentially connected to form a cavity structure, the battery module (200) is disposed within the cavity structure and connected to the battery pack lower housing (300), and the battery cells (101) in the battery module (200) are inverted, characterized in that, An anti-collision structure is provided between the battery cell (101) and the bottom guard plate (400) of the battery pack. The anti-collision structure includes a deformable energy-absorbing component (102) connected to the middle part of the lower end of each row of battery cells (101) and a support component (103) connected to the lower end of each row of battery cells (101) to support the deformation of the bottom guard plate (400) of the battery pack after being impacted.

2. A power battery pack with inverted cells according to claim 1, characterized in that, The energy-absorbing component (102) includes an energy-absorbing component housing and a plurality of triangular ribs disposed inside the energy-absorbing component housing.

3. A power battery pack with inverted cells according to claim 1, characterized in that, The energy-absorbing component (102) includes an energy-absorbing component housing (501) and a honeycomb-shaped energy-absorbing body (502), wherein the honeycomb-shaped energy-absorbing body (502) is disposed inside the energy-absorbing component housing (501).

4. A power battery pack with inverted cells according to claim 1, characterized in that, The energy-absorbing component (102) includes an energy-absorbing component housing and a plurality of vertical ribs spaced apart inside the energy-absorbing component housing.

5. A power battery pack with inverted cells according to claim 1, characterized in that, The energy-absorbing component (102) includes a combined energy-absorbing component cover (701) and a combined energy-absorbing component body (703). The combined energy-absorbing component cover (701) covers the combined energy-absorbing component body (703). The combined energy-absorbing component body (703) is provided with a busbar placement area (903) for storing the busbar (702) and a hollow structure (904) for exposing the battery cell.

6. A power battery pack with inverted cells according to claim 5, characterized in that, The main body (703) of the combined energy-absorbing component is provided with a plurality of conical energy-absorbing buffer structures (901), and the upper cover (701) of the combined energy-absorbing component is provided with circular holes corresponding one-to-one with the positions of the energy-absorbing buffer structures (901).

7. A power battery pack with inverted cells according to claim 6, characterized in that, The busbar placement area (903) is provided with a first reinforcing rib (902) and a second reinforcing rib (905) on both sides respectively.

8. A power battery pack with inverted cells according to claim 1, characterized in that, The support member (103) is I-shaped and the material of the support member (103) is aluminum.

9. A power battery pack with inverted cells according to claim 1, characterized in that, The support (103) is connected to the shoulders on both sides of each row of cells (101).

10. The power battery pack with inverted cells according to any one of claims 1-9, characterized in that, The bottom protective plate (400) of the battery pack has a grid structure.

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