A power battery pack and an electric vehicle

Abstract

This invention discloses a power battery pack and an electric vehicle, belonging to the field of power battery technology. It includes a lower housing, inside which at least two electrically connected battery modules are arranged via a positioning assembly. The positive and negative terminals of the battery modules face the bottom of the lower housing and are electrically connected to a battery management system via the positioning assembly. This invention provides a power battery pack and electric vehicle that form a large module structure by combining battery modules with a central integration plate, a top integration plate, and a bottom integrator. The central and top integration plates can fix all battery cells inside, ensuring secure installation and resisting cell expansion. The bottom integrator connects the battery management system and the battery modules, achieving an integrated and modular design of the power battery pack and improving overall safety performance.

Description

Technical Field

[0001] This invention discloses a power battery pack and an electric vehicle, belonging to the field of power battery technology. Background Technology

[0002] With the continuous improvement of people's living standards, automobiles have become an essential item for every family. However, with the increasing number of gasoline-powered vehicles, the pollution of our living environment caused by harmful gases and other pollutants has reached an unbearable level. Therefore, we must find new energy sources that can, to some extent, replace gasoline to alleviate our environmental pressure. Based on this situation, new energy vehicles using power batteries have become increasingly popular due to their obvious advantages. First, new energy vehicles using power batteries are more cost-effective than gasoline vehicles. Second, because batteries do not undergo oxidation reactions with oxygen, there are no excess exhaust gases emitted during charging and discharging, effectively preventing environmental pollution. In the new energy vehicle industry, power batteries, as a key core component, have extremely important structural safety and thermal management performance. Currently, the mainstream battery assembly solutions are standard modules or CTP (cell-to-pack) battery assemblies. These two solutions have relatively complex structures and two major problems: 1. Limited by the height restriction in the Z-axis arrangement, resulting in low integration; 2. Poor thermal management performance, unable to guarantee temperature consistency between and within battery cells. Summary of the Invention

[0003] The purpose of this invention is to solve the problems of low management efficiency of battery thermal management systems, poor temperature consistency of battery modules, and low integration of battery assemblies in the prior art, and to propose a power battery pack and electric vehicle.

[0004] The problem to be solved by the present invention is achieved by the following technical solution: According to a first aspect of the present invention, a power battery pack is provided, including a lower housing, wherein at least two electrically connected battery modules are disposed inside the lower housing via a positioning assembly, and the positive and negative terminals of the battery modules face the bottom of the lower housing and are electrically connected to a battery management system via the positioning assembly. Preferably, the battery module includes a plurality of battery cells, and the plurality of battery cells are arranged in an array at intervals of N rows.

[0005] Preferably, the lower housing includes a liquid cooling plate, and a side frame is fixed around the upper part of the liquid cooling plate. A partition beam assembly is provided inside the side frame to separate two adjacent battery modules.

[0006] Preferably, the partition beam assembly includes at least one hollow crossbeam, which is disposed between two adjacent battery modules along a first direction, and the two ends of the hollow crossbeam are respectively connected to the side frame.

[0007] Preferably, the partition beam assembly includes at least one hollow longitudinal beam, which is disposed between two adjacent battery modules along a second direction, with both ends of the hollow longitudinal beam connected to the side frame, and the second direction being perpendicular to the first direction.

[0008] Preferably, the positioning assembly includes a bottom integrator disposed between the liquid cooling plate and the partition beam assembly, the battery module is disposed on the bottom integrator, a middle integrator supported by the partition beam assembly is disposed on the top of the bottom integrator, the middle integrator is sleeved on the battery module, and a top integrator sleeved on the side of the middle integrator away from the bottom integrator is disposed on the side of the battery module.

[0009] Preferably, the bottom integrator is provided with a plurality of cell positioning seats for installing the cells. The bottom of the cell positioning seat is symmetrically arranged with positive and negative connection holes that mate with the positive and negative terminals of the cell. The bottom of the positive and negative connection holes is respectively provided with contact metal pieces that connect to the positive and negative terminals of the cell. The contact metal pieces are electrically connected to the battery management system.

[0010] Preferably, the central integrated plate includes: a central outer frame reinforcing and fixing assembly, which is circumferentially disposed around the battery module; a central reinforcing beam, the end of which is connected to the central outer frame reinforcing and fixing assembly and corresponds to the partition beam assembly; and a plurality of central expansion positioning plates, the two ends of which are respectively connected to the central outer frame reinforcing and fixing assembly and the inner side of the central reinforcing beam to form a plurality of grids for positioning the battery cells, wherein the battery cells are located within the grids and the central expansion positioning plates are disposed between two adjacent battery cells.

[0011] Preferably, the top integrated plate includes: a top outer frame reinforcing and fixing assembly, which is circumferentially disposed around the battery module; a top reinforcing beam, the end of which is connected to the top outer frame reinforcing and fixing assembly and corresponds to the partition beam assembly; and a plurality of top expansion positioning plates, the two ends of which are respectively connected to the top outer frame reinforcing and fixing assembly and the inner side of the top reinforcing beam to form a plurality of grids for positioning the battery cells, wherein the battery cells are located within the grids and the top expansion positioning plates are disposed between two adjacent battery cells, and the top ends of the grids are provided with baffle positioning parts, the inner side of the baffle positioning parts contacting and cooperating with the battery cells for positioning.

[0012] According to a second aspect of the present invention, an electric vehicle is provided, including a vehicle body and a power battery pack as described in the first aspect.

[0013] The advantages of this invention compared to existing technologies are as follows: This invention provides a power battery pack and an electric vehicle, in which a large module structure is formed by the battery module, a middle integration plate, a top integration plate, and a bottom integration plate. The middle integration plate and the top integration plate can fix all the battery cells inside, ensuring the installation and fixation of the battery cells and resisting the battery cells.

[0014] The expansion effect allows the bottom integrator to connect the battery management system and battery modules, achieving an integrated and modular design for the power battery pack and improving overall safety performance. Attached Figure Description

[0015] Figure 1 This is the isometric test diagram of the present invention.

[0016] Figure 2 This is a partial isometric side view of the present invention.

[0017] Figure 3 This is a bottom view of the present invention.

[0018] Figure 4 This is the present invention. Figure 1 Enlarged view of point A.

[0019] Figure 5 This is a partial isometric side view of the present invention.

[0020] Figure 6 This is an isometric side view of the bottom integrator of the present invention.

[0021] Figure 7 This is a schematic diagram of the electrical connection between the bottom integrator and the battery management system of the present invention.

[0022] Figure 8 This is an isometric side view of the central integrated plate of the present invention.

[0023] Figure 9 This is an isometric side view of the top integrated plate of the present invention.

[0024] Figure 10 This is the present invention. Figure 9 Enlarged view of point B.

[0025] Among them, 1-lower box, 11-side frame, 12-partition beam assembly, 121-hollow longitudinal beam, 122-hollow transverse beam, 2-battery module, 3-top integrated plate, 31-top outer frame reinforcement and fixing assembly, 32-top reinforcing beam, 33-top expansion positioning piece, 34-baffle positioning part, 4-middle integrated plate, 41-middle outer frame reinforcement and fixing assembly, 42-middle reinforcing beam, 43-middle expansion positioning piece, 5-bottom integrator, 51-cell positioning seat, 52-positive electrode connection hole, 53-negative electrode connection hole. Detailed Implementation

[0026] The following is based on the appendix Figure 1-10 Further explanation of the present invention: The technical solution 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, 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.

[0027] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] like Figure 1 As shown, the first embodiment of the present invention provides a power battery pack based on the prior art, including: a lower housing 1, battery modules 2, and a positioning assembly. At least two electrically connected battery modules 2 are installed inside the lower housing 1 via the positioning assembly. The positive and negative terminals of the battery modules 2 face the bottom of the lower housing 1 and are electrically connected to the battery management system via the positioning assembly. Each battery module 2 includes a plurality of cells, which are arranged in an array with N rows of spacing.

[0030] like Figure 2-3 As shown, the lower housing 1 includes a liquid cooling plate 13, with side frames 11 fixed around the upper perimeter of the liquid cooling plate 13. A partition beam assembly 12 is disposed within the side frames 11 to separate two adjacent battery modules 2. The partition beam assembly 12 includes at least one hollow crossbeam 122, which is installed between two adjacent battery modules 2 along a first direction. Both ends of the hollow crossbeam 122 are connected to the side frames 11. In the first embodiment, when only two battery modules 2 are arranged longitudinally, the two battery modules 2 are separated by a hollow crossbeam 122.

[0031] In the second embodiment, when the battery module 2 is arranged laterally, the partition beam assembly 12 includes at least one hollow longitudinal beam 121. The hollow longitudinal beam 121 is installed between two adjacent battery modules 2 along the second direction, and the two ends of the hollow longitudinal beam 121 are respectively connected to the side frame 11. In the third embodiment, when the battery module 2 is arranged both laterally and longitudinally, the hollow cross beam 122 and the hollow longitudinal beam 121 are combined and installed in the lower housing 1. At this time, the second direction is perpendicular to the first direction.

[0032] The following is an introduction to the positioning assembly, such as... Figure 4-5 As shown, it includes: a bottom integrator 5, a middle integrator 4, and a top integrator 3. The bottom integrator 5 is installed between the liquid cooling plate 13 and the partition beam assembly 12, and the battery module 2 is installed on the bottom integrator 5. The specific structure is as follows. Figure 6 As shown, the bottom integrator 5 includes several cell positioning seats 51 for mounting battery cells. The bottom of each cell positioning seat 51 has symmetrically arranged positive and negative connection holes 52 and 53 that mate with the positive and negative terminals of the battery cells. When several battery cells of the battery module 2 are mounted on the cell positioning seats 51, the positive and negative terminals of the battery cells are respectively mounted on the positive and negative connection holes 52 and 53. Since the bottom of the positive and negative connection holes 52 and 53 are respectively provided with contact metal pieces that connect to the positive and negative terminals of the battery cells, and these contact metal pieces are electrically connected to the battery management system, such as... Figure 7 As shown.

[0033] The middle integration plate 4 is mounted on top of the bottom integrator 5 and supported by the partition beam assembly 12. The middle integration plate 4 is sleeved on the battery module 2, and the specific structure is as follows: Figure 8 As shown, the central integrated plate 4 includes a central outer frame reinforcing and fixing component 41, a central reinforcing beam 42, and several central expansion positioning plates 43. It is arranged circumferentially around the battery module 2. The end of the central reinforcing beam 42 is connected to the central outer frame reinforcing and fixing component 41 and corresponds to the partition beam component 12, so that the central reinforcing beam 42 is placed on the partition beam component 12 during installation. The two ends of the several central expansion positioning plates 43 are respectively connected to the inner sides of the central outer frame reinforcing and fixing component 41 and the central reinforcing beam 42 to form several grids for positioning the battery cells. When the central integrated plate 4 is fitted onto the battery module 2, the battery cells are within the grids, and the top expansion positioning plates 43 are installed between two adjacent battery cells, ensuring the installation and fixing of the battery cells and resisting the expansion of the battery cells.

[0034] The top integrated plate 3 is installed on the side of the middle integrated plate 4 away from the bottom integrated plate 5. During installation, the top integrated plate 3 is fitted onto the battery module 2, as shown in the specific structure. Figure 9-10As shown, the top integrated plate 3 includes: a top outer frame reinforcing and fixing component 31, a top reinforcing beam 32, and several top expansion positioning pieces 33. The top outer frame reinforcing and fixing component 31 is circumferentially arranged around the battery module 2. The end of the top reinforcing beam 32 is connected to the top outer frame reinforcing and fixing component 31 and corresponds to the partition beam component 12. The two ends of the several top expansion positioning pieces 33 are respectively connected to the inner sides of the top outer frame reinforcing and fixing component 31 and the top reinforcing beam 32 to form several grids for positioning the battery cells. When the top integrated plate 3 is sleeved on the battery module 2, the battery cells are inside the grids and the top expansion positioning pieces 33 are installed between two adjacent battery cells. The top of both ends of the grids are provided with baffle positioning parts 34. The inner side of the baffle positioning parts 34 contacts and cooperates with the battery cells for positioning, so that the top integrated plate 3 is fastened to the battery module 2.

[0035] The second embodiment of the present invention provides an electric vehicle based on the first embodiment, including a vehicle body and a power battery pack as described in the first embodiment.

[0036] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for the present invention. Other modifications can be readily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and examples shown and described herein.

Claims

1. A power battery pack, comprising a lower housing (1), characterized in that, Inside the lower housing (1), at least two electrically connected battery modules (2) are arranged via a positioning assembly. The positive and negative terminals of the battery modules (2) face the bottom of the lower housing (1) and are electrically connected to the battery management system via the positioning assembly. Each battery module (2) includes several cells arranged in an array at intervals of N rows. The lower housing (1) includes a liquid cooling plate (13). Side frames (11) are fixed around the upper part of the liquid cooling plate (13). A partition beam assembly (12) is provided inside the side frame (11) to separate two adjacent battery modules (2). The partition beam assembly (12) includes at least one hollow crossbeam (122). The hollow crossbeam (122) is arranged along a first direction between adjacent battery modules (2). Between the battery modules (2), the two ends of the hollow crossbeam (122) are respectively connected to the side frame (11). The partition beam assembly (12) includes at least one hollow longitudinal beam (121). The hollow longitudinal beam (121) is arranged between two adjacent battery modules (2) along a second direction. The two ends of the hollow longitudinal beam (121) are respectively connected to the side frame (11). The second direction is perpendicular to the first direction. The positioning assembly includes a bottom integrator (5) disposed between the liquid cooling plate (13) and the partition beam assembly (12). The battery modules (2) are disposed on the bottom integrator (5). The bottom integrator (5) has a middle integrated plate (4) supported by the partition beam assembly (12) at its top. 4) The middle integrated plate (4) is fitted onto the battery module (2). A top integrated plate (3) fitted onto the battery module (2) is provided on the side of the middle integrated plate (4) away from the bottom integrated plate (5). The bottom integrated plate (5) includes a plurality of cell positioning seats (51) for installing cells. The bottom of the cell positioning seat (51) is symmetrically arranged with positive electrode connection holes (52) and negative electrode connection holes (53) that cooperate with the positive and negative electrodes of the cells. The bottom of the positive electrode connection holes (52) and negative electrode connection holes (53) are respectively provided with contact metal pieces that connect to the positive and negative electrodes of the cells. The contact metal pieces are electrically connected to the battery management system. The middle integrated plate (4) includes: a middle outer frame reinforcing fixing component (41), which is arranged around the battery module (2). The battery module (2) includes: a circumferential reinforcing beam (42) with its end connected to the central outer frame reinforcing fixing component (41) and corresponding to the partition beam component (12); and several central expansion positioning pieces (43) with their ends connected to the inner side of the central outer frame reinforcing fixing component (41) and the central reinforcing beam (42) to form several grids for positioning the battery cells, wherein the battery cells are located within the grids and the central expansion positioning pieces (43) are positioned between two adjacent battery cells. The top integrated plate (3) includes: a top outer frame reinforcing fixing component (31) which is circumferentially arranged around the battery module (2); and a top reinforcing beam (32) with its end connected to the top outer frame reinforcing fixing component (31) and corresponding to the partition beam component (12).Several top expansion positioning plates (33) are connected at both ends to the inner sides of the top outer frame reinforcing fixing assembly (31) and the top reinforcing beam (32) respectively to form several grids for positioning the battery cells. The battery cells are located within the grids, and the top expansion positioning plates (33) are positioned between two adjacent battery cells. Each grid has a baffle positioning part (34) at its top end, and the inner side of the baffle positioning part (34) contacts and engages with the battery cell for positioning.

2. An electric vehicle, characterized in that, It includes the vehicle body and the power battery pack as described in claim 1.

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