CN115122896A - Power battery assembly highly integrated with vehicle body floor, electric vehicle and design method - Google Patents

Abstract

The invention discloses a power battery assembly highly integrated with a vehicle body floor, which belongs to the technical field of automobiles and comprises a vehicle body structure, a battery module, a vehicle front suspension, a vehicle rear suspension and a floor cover plate, wherein the vehicle body floor arranged at the bottom of the vehicle body structure is fixedly connected with the floor cover plate to form a closed cavity, and the closed cavity is used for fixing the battery module; the vehicle front suspension is fixed at the bottom of the vehicle body structure and is positioned on the front side of the battery module; the vehicle rear suspension is fixed at the bottom of the vehicle body structure and is positioned on the rear side of the battery module. The vacant structure of the vehicle body floor on the vehicle body structure and the lower box body floor form a structure for accommodating the battery module, the vehicle body cancels a front floor, a middle floor and a rear floor, high integration and high sealing of the vehicle body and the lower box body of the battery are realized, and the space utilization rate of the whole vehicle is improved; the integration performance, the process performance, the safety performance and the service life of the electric vehicle are improved.

Description

A power battery assembly, electric vehicle and design highly integrated with body floor method

technical field

The invention belongs to the technical field of automobiles, and in particular relates to a power battery assembly highly integrated with a vehicle body floor, an electric vehicle and a design method.

Background technique

As a key core component of new energy vehicles, power batteries have very important structural integration performance. The current mainstream battery assembly solutions are standard modules or CTP configuration battery assemblies. These two solutions are relatively complex in structure and have two major problems: 1. Subject to the height restriction of Z-direction layout, the integration is low; 2. With The vehicle assembly performance is poor and the space utilization rate is low. The invention aims to provide a power battery assembly that is highly integrated with the vehicle body floor, and mainly solves the technical problems in the industry of low volume space utilization, low integration and complex structure of electric vehicles in the prior art. The present invention also provides an electric vehicle including such a battery assembly.

The prior art discloses a power battery pack and an electric vehicle. The power battery pack includes a tray and a plurality of single cells arranged on the tray, the single cells are arranged along a first direction, and the single cells extend along a second direction; the tray includes The first side and the second side extending along the first direction, the first side and the second side are arranged opposite to each other in the second direction, and also include a single battery limiter disposed on the tray, and the single battery limiter includes A first limiter disposed adjacent to the first side and a second limiter disposed adjacent to the second side, the first limiter and the second limiter restrict the single cell in the thickness and length directions of the single cell. limit. The electric vehicle includes the above-mentioned power battery pack. The invention limits the position of the single battery in the first direction and the second direction by the single battery limiter, and can limit the position of a plurality of single cells at the same time, which effectively improves the efficiency of assembling the power battery pack and reduces the assembly time. cost.

The prior art discloses a battery pack, which includes more than two battery modules; the battery modules each include a frame and a plurality of battery cells accommodated in the frame; a sleeve is fixedly arranged between adjacent frames the barrel; the sleeve has a channel for passing the fixing piece; the fixing piece is used for fixing the battery pack to the whole vehicle. The battery pack provided by the present application includes more than two battery modules, which not only realizes the lightweight of the battery pack, but also improves the connection strength of the battery pack in the whole vehicle.

The prior art also discloses a power battery system for a vehicle. The box body includes: a heat exchange plate; The accommodating space of the battery, the heat exchange plate is used to support the battery and exchange heat with the battery, and the lower frame is a hollow structure with a hollow cavity; the protective plate is located under the heat exchange plate, and protects the heat exchange plate from below; The sealing riveting element fixes the protective plate, the heat exchange plate and the lower frame together, the self-sealing riveting element passes through the protective plate and the heat exchange plate in the up-down direction, and the self-sealing riveting element is inserted into the lower frame and at least partially exposed to the lower frame. In the frame body, the self-sealing riveting element seals at the first position passing through the protective plate, and the self-sealing riveting element seals at the second position inserted into the lower frame body. The self-sealing riveting element can directly seal at the first position passing through the protective plate and the second position inserted into the lower frame, which solves the sealing problem at the conventional fastener, simplifies the assembly process and reduces the cost.

However, the above-mentioned application and the content of the invention of this application are obviously different in the technical problems and technical solutions to be solved. The battery solution in terms of sealing and preventing thermal diffusion is not available in the above-mentioned application. Conventional means, easily determined by a limited number of experiments.

SUMMARY OF THE INVENTION

In order to overcome the industry technical problems of low volume and space utilization, low integration and complex structure of electric vehicles in the prior art, the present invention provides a power battery assembly, an electric vehicle and a design method that are highly integrated with the vehicle body floor, The vacant structure of the body floor on the body structure and the lower box floor form a structure for accommodating battery modules. The body cancels the front floor, middle floor, and rear floor to achieve a high degree of integration and sealing between the body and the battery lower box, improving the overall vehicle. space utilization; improve the integration performance, process performance, safety performance and service life of electric vehicles.

The present invention is achieved through the following technical solutions:

In the first aspect, the present invention provides a power battery assembly that is highly integrated with the vehicle body floor, including a vehicle body structure 1, a battery module 2, a vehicle front suspension 3, a vehicle rear suspension 4 and a floor cover 5, The body floor 107 provided at the bottom of the body structure 1 is fixedly connected with the floor cover 5 to form a closed cavity, and the closed cavity is used for fixing the battery module 2; the vehicle front suspension 3 is fixed on the body The bottom of the structure 1 is located on the front side of the battery module 2 ; the vehicle rear suspension 4 is fixed on the bottom of the body structure 1 and located on the rear side of the battery module 2 .

Further, the body structure 1 is composed of a body frame 106 and a body floor 107 , the body floor 107 is located at the bottom of the body frame 106 , the floor cover 5 is fixed on the body floor 107 , the body floor 107 and the floor cover 5 A battery module 2 is fixed therebetween.

Further, four doors and two covers are integrated on the body frame 106 .

Further, the middle part of the vehicle body floor 107 is a hollowed out structure, and the lower box floor 101 is fixedly connected to the hollow structure, and the battery module 2 is fixedly connected to the lower box floor 101 for the battery module Group 2 carries the fixing and thermal management functions.

Further, the body floor 107 is made of high-strength and high-temperature-resistant metal materials, including but not limited to iron alloys, aluminum alloys, titanium alloys and other metal materials.

Further, a sealing structure 102 is arranged between the lower box floor 101 and the vacant structure of the body floor 107 , an anti-collision structure 103 is arranged below the sealing structure 102 , and an inner beam is also connected to the upper surface of the lower box floor 101 104 and internal stringers 105.

Further, the internal beams 104 are connected to the floor cover 5 by bolts, which can improve the overall battery mode; the internal longitudinal beams 105 are connected to the floor cover 5 by bolts, which can improve the overall battery mode.

In a second aspect, the present invention provides an electric vehicle, including the power battery assembly highly integrated with the vehicle body floor according to the present invention.

In a third aspect, the present invention also provides a power battery assembly design method that is highly integrated with the vehicle body floor, comprising the following steps:

Step A: Determine the limit size area S=CH*CC*GC*exp(A*A)*0.895*exp(A)* according to the total energy CH required by the battery assembly and the limit installation GC of the body cos(D), where CC is the structural coefficient related to the total energy of the battery, A is the weight compensation parameter, and D is the integrated compensation parameter;

Step B: Determine the limit size of the box under the battery according to S:

Define the length C=S/(GB*E)*2/4*cos(D), where GB is the process length limit dimension, E is the safety dimension factor; D is the integrated compensation parameter;

Step C: Define the width of the box under the battery H=S/A*0.92, where CC is the capacity-related structural coefficient, and A is the weight compensation parameter;

All parameters require correction feedback based on CAE simulation results.

Further, CC described in step A is 0.86-0.92, 0>A>-0.96, 29°>D>2°, E described in step B is 1.23-1.83, 29°>D>2°, The CC described in step C is 0.8-0.85, 0>A>-0.55.

Compared with the prior art, the advantages of the present invention are as follows:

A power battery assembly, an electric vehicle and a design method that are highly integrated with the vehicle body floor of the present invention have the advantages of simple structure, high integration and good process performance. A structure for accommodating battery modules is formed, and the front floor, middle floor and rear floor are eliminated from the body to achieve high integration and sealing between the body and the lower battery box, improving the space utilization of the vehicle and improving the integration performance and process performance of electric vehicles. , safety performance, service life.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are required to be used in the description of the specific embodiments or the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. In the drawings, each element or section is not necessarily drawn to actual scale.

1 is a schematic diagram I of the overall structure of a power battery assembly highly integrated with the vehicle body floor according to the present invention;

2 is a schematic diagram II of the overall structure of a power battery assembly highly integrated with the vehicle body floor of the present invention;

3 is a schematic diagram III of the overall structure of a power battery assembly highly integrated with the vehicle body floor according to the present invention;

4 is a schematic diagram of a battery module of a power battery assembly highly integrated with a vehicle body floor according to the present invention;

5 is a schematic diagram IV of the overall structure of a power battery assembly highly integrated with the vehicle body floor according to the present invention;

In the figure: body structure 1, battery module 2, vehicle front suspension 3, vehicle rear suspension 4, floor cover 5;

The lower box floor 101 , the sealing structure 102 , the anti-collision structure 103 , the inner beam 104 , the inner longitudinal beam 105 , the body frame 106 , and the body floor 107 .

Detailed ways

In order to clearly and completely describe the technical solution of the present invention and its specific working process, with reference to the accompanying drawings, the specific embodiments of the present invention are as follows:

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Example 1

As shown in Figure 1, Figure 2 and Figure 3, this embodiment provides a power battery assembly that is highly integrated with the vehicle body floor, including a vehicle body structure 1, a battery module 2, a vehicle front suspension 3, and a vehicle rear The suspension 4 and the floor cover 5, the body floor 107 provided at the bottom of the body structure 1 and the floor cover 5 are fixedly connected to form a closed cavity, and the closed cavity is used for fixing the battery module 2; the The vehicle front suspension 3 is fixed on the bottom of the vehicle body structure 1 and is located on the front side of the battery module 2 ; the vehicle rear suspension 4 is fixed on the bottom of the vehicle body structure 1 and located on the rear side of the battery module 2 .

As shown in FIG. 3 , the structure of the body structure is introduced in detail. The body structure 1 is composed of a body frame 106 and a body floor 107 . The body floor 107 is located at the bottom of the body frame 106 , and the floor cover 5 is fixed on the body floor 107 . Above, the battery module 2 is fixed between the vehicle body floor 107 and the floor cover 5 .

The body frame 106 is integrated with four doors and two covers.

The middle of the vehicle body floor 107 is a hollowed out structure, and a lower box floor 101 is fixedly connected in the hollow structure. The lower box floor 101 is fixedly connected with the floor cover 5 to form a closed space. The battery module 2 is fixedly connected to realize the bearing fixing and thermal management functions of the battery module 2 .

The body floor 107 is made of high-strength and high-temperature-resistant metal materials, including but not limited to iron alloys, aluminum alloys, titanium alloys and other metal materials.

A sealing structure 102 is arranged between the lower box floor 101 and the vacant structure of the vehicle body floor 107 , an anti-collision structure 103 is arranged below the sealing structure 102 , and the upper surface of the lower box floor 101 is also connected with an internal beam 104 and an internal beam 104 . Stringer 105 .

The internal beams 104 are connected to the floor cover 5 by bolts, which can improve the overall battery mode; the internal longitudinal beams 105 are connected to the floor cover 5 by bolts, which can improve the overall battery mode.

As shown in FIG. 4 , the battery module 2 is composed of a plurality of battery cells arranged in a group, and a side-by-side structure is formed by connecting methods such as bonding.

Example 2

This embodiment provides an electric vehicle, including the power battery assembly highly integrated with the vehicle body floor described in Embodiment 1.

Example 3

This embodiment provides a power battery assembly design method that is highly integrated with the vehicle body floor, including the following steps:

Step A: Determine the limit size surface S=CH*CC*GC*exp(A*A)*0.895*exp(A) * according to the total energy CH required by the battery assembly and the limit installation GC of the body cos(D), where CC is the structural coefficient related to the total energy of the battery, generally taking 0.86-0.92; A is the weight compensation parameter, generally taking 0>A>-0.96; D is the integrated compensation parameter, generally taking 29°>D> 2°;

Step B: Determine the limit size of the box under the battery according to S:

Define the length C=S/(GB*E)*2/4*cos(D), where GB is the limit size of the process length, E is the safety dimension factor, generally 1.23-1.83; D is the integrated compensation parameter, generally 29 °＞D＞2°;

Step C: Define the width of the box under the battery H=S/A*0.92, where CC is the capacity-related structural coefficient, generally 0.8-0.85, and A is the weight compensation parameter, generally 0>A>-0.55;

All parameters require correction feedback based on CAE simulation results.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above-mentioned embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, These simple modifications all belong to the protection scope of the present invention.

In addition, it should be noted that the specific technical features described in the above-mentioned specific embodiments can be combined in any suitable manner unless they are inconsistent. In order to avoid unnecessary repetition, the present invention provides The combination method will not be specified otherwise.

In addition, the various embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the contents disclosed in the present invention.

Claims (10)

1. The power battery assembly highly integrated with a vehicle body floor is characterized by comprising a vehicle body structure (1), a battery module (2), a vehicle front suspension (3), a vehicle rear suspension (4) and a floor cover plate (5), wherein a vehicle body floor (107) arranged at the bottom of the vehicle body structure (1) is fixedly connected with the floor cover plate (5) to form a closed cavity, and the closed cavity is used for fixing the battery module (2); the vehicle front suspension (3) is fixed at the bottom of the vehicle body structure (1) and is positioned on the front side of the battery module (2); the vehicle rear suspension (4) is fixed to the bottom of the vehicle body structure (1) and located on the rear side of the battery module (2).

2. A vehicle body floor highly integrated power battery assembly according to claim 1, wherein the vehicle body structure (1) is composed of a vehicle body frame (106) and a vehicle body floor (107), the vehicle body floor (107) is located at the bottom of the vehicle body frame (106), the floor cover (5) is fixed on the vehicle body floor (107), and the battery module (2) is fixed between the vehicle body floor (107) and the floor cover (5).

3. A power battery assembly highly integrated with a vehicle body floor according to claim 2, wherein a four-door two-cover is integrated on the vehicle body frame (106).

4. The power battery assembly highly integrated with the vehicle body floor as claimed in claim 3, wherein the vehicle body floor (107) is a hollow-out hollow structure in the middle, a lower box body floor (101) is fixedly connected in the hollow structure, and a battery module (2) is fixedly connected to the lower box body floor (101) and is used for carrying, fixing and thermally managing the battery module (2).

5. A power battery assembly highly integrated with a vehicle body floor according to claim 4, wherein the material of the vehicle body floor (107) is an iron alloy, an aluminum alloy or a titanium alloy.

6. The power battery assembly highly integrated with the vehicle body floor as claimed in claim 5, wherein a sealing structure (102) is arranged between the lower box floor (101) and a vacant structure of the vehicle body floor (107), an anti-collision structure (103) is arranged below the sealing structure (102), and an inner cross beam (104) and an inner longitudinal beam (105) are further connected to the upper surface of the lower box floor (101).

7. A vehicle body floor highly integrated power battery assembly according to claim 6, wherein the inner cross member (104) is connected with the floor cover plate (5) through bolts, so that the overall battery mode can be improved; the inner longitudinal beam (105) is connected with the floor cover plate (5) through a bolt, and the mode of the whole battery can be improved.

8. An electric vehicle comprising a body floor highly integrated power battery assembly as claimed in any one of claims 1 to 7.

9. A method for designing a power battery assembly highly integrated with a vehicle body floor, which is used for designing the power battery assembly highly integrated with the vehicle body floor according to any one of claims 1 to 7, and is characterized by comprising the following steps:

step A: determining the limit size area S of a lower box body of the battery assembly battery according to the total energy CH required by the battery assembly and the limit installation GC of the automobile body, wherein the limit size area S is CH, CC, GC, exp (A, A) 0.895, exp (A) cos (D), CC is a related structural coefficient of the total energy of the battery, A is a weight compensation parameter, and D is an integrated compensation parameter;

and B: determining the limit size of the lower box of the battery according to the S:

defining a length C/(GB × E) 2/4 cos (D), wherein GB is a process length limit size, and E is a safety size coefficient; d is an integrated compensation parameter;

and C: defining the width H of the lower box body of the battery to be S/A0.92, wherein CC is a capacity-related structural coefficient, and A is a weight compensation parameter;

all parameters need to be fed back according to CAE simulation results.

10. The method of claim 9, wherein the value of CC in step A is 0.86-0.92, 0 > A > -0.96, 29 ° > D > 2 °, the value of E in step B is 1.23-1.83, 29 ° > D > 2 °, and the value of CC in step C is 0.8-0.85, 0 > A > -0.55.

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