CN115122895A - Power battery assembly integrated with vehicle body overall floor, electric vehicle and design method - Google Patents

Abstract

The invention discloses a power battery assembly integrated with a vehicle body total floor, an electric vehicle and a design method, which belong to the technical field of automobiles and comprise the following steps: the vehicle body structure and the battery assembly are fixed in a vacant structure arranged on a vehicle body floor and integrated with the bottom of the vehicle body structure into a whole; the vehicle front suspension is fixed at the bottom of the vehicle body structure and is positioned on the front side of the battery assembly; and the vehicle rear suspension is fixed at the bottom of the vehicle body structure and is positioned at the rear side of the battery assembly. The battery assembly is connected with the vehicle body through a vacant structure on the vehicle body floor, and the vehicle body is not provided with a front floor, a middle floor and a rear floor, so that the high integration and high sealing of the upper box body of the battery assembly are realized, and the space utilization rate of the whole vehicle is improved; the battery module group fixing device can realize high integration of the electric vehicle and reliable fixation of the battery modules into a group, and improves the integration performance, the process performance, the safety performance and the service life of the electric vehicle.

Description

A power battery assembly, electric vehicle and design integrated with the overall floor of the body method

technical field

The invention belongs to the technical field of automobiles, and in particular relates to a power battery assembly integrated with an overall floor of a vehicle body, 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 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 integrated with the overall floor of the vehicle body, an electric vehicle and a design method, The battery assembly is connected to the body through the vacant structure on the body floor. The body cancels the front floor, middle floor and rear floor to achieve high integration and high sealing with the upper box of the battery assembly and improve the space utilization of the vehicle; it can be realized The high integration of electric vehicles and the reliable fixing of battery modules into groups 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 a first aspect, the present invention provides a power battery assembly integrated with the overall floor of a vehicle body, including:

The body structure 1 includes a body frame 101 , a front seat beam 102 , a rear seat beam 103 and a body floor 104 ; a body floor 104 is provided at the bottom of the body frame 101 , and a front seat beam 102 is integrated on the body floor 104 and rear seat beam 103;

The battery assembly 2 is fixed in the vacant structure provided on the body floor 104, and is integrated with the bottom of the body structure 1;

The vehicle front suspension 3 is fixed on the bottom of the body structure 1 and is located on the front side of the battery assembly 2;

The rear suspension 4 of the vehicle is fixed to the bottom of the body structure 1 and is located on the rear side of the battery assembly 2 .

Further, the battery assembly 2 includes:

The lower box floor 201, the lower box floor 201 is integrated with the battery liquid cold plate to realize the functions of bearing, fixing and thermal management of the battery module 203;

a sealing structure 202, the sealing structure 202 is arranged around the upper surface of the lower box floor 201;

The battery module 203, the battery module 203 is arranged in the frame enclosed by the lower box floor 201 and the sealing structure 202;

an anti-collision structure 204, the anti-collision structure 204 is arranged outside the sealing structure 202;

The upper box 205 is connected to the floor 201 of the lower box.

Further, the battery modules 203 are arranged in groups by a plurality of battery cells, and form a side-by-side structure by means of bonding or the like.

Further, four doors and two covers are integrated on the body frame 101 .

Further, the middle part of the vehicle body floor 104 is a hollowed out structure, and the hollow structure is used for fixing the battery assembly 2 .

Further, the vehicle body floor 104 is made of metal materials with high strength and high temperature resistance, including but not limited to metal materials such as iron alloys, aluminum alloys, and titanium alloys.

Further, the front seat beam 102 and the rear seat beam 103 are both fixed on the upper surface of the void structure of the vehicle body floor 104 ; the front seat beam 102 and the rear seat beam 103 are arranged in parallel.

Further, the front seat beam 102 is connected to the upper box 205 of the battery assembly 2 through bolts, which can improve the overall battery mode; the rear seat beam 103 is connected to the upper box 205 of the battery assembly 2 through bolts connected to improve the overall battery modality.

In a second aspect, the present invention provides an electric vehicle, including the power battery assembly described in the present invention integrated with the overall floor of the vehicle body.

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

Step A: Determine the limit size of the lower box of the battery assembly according to the total energy CH required by the battery assembly and the limit installation GC of the body:

Step B: limit size area S=CH*CC*GC*exp(A)*0.895*exp(A)*exp(A)*sin(D), where CC is the structural coefficient related to the total energy of the battery; A is the weight Compensation parameter; D is the integrated compensation parameter;

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

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

Define the width of the box under the battery H=S/A*0.92, where CC is the structural coefficient related to the total energy of the battery, and A is the weight compensation parameter;

All parameters require correction feedback based on CAE simulation results.

Further, CC described in step B is 0.76-0.92, 0>A>-0.56, 89°>D>65°; E described in step C is 1.23-1.83, 89°>D>65°, 0>A>-0.55, CC takes 0.8-0.85.

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

The power battery assembly integrated with the overall floor of the vehicle body, the electric vehicle and the design method of the present invention have the advantages of simple structure, high integration and good process performance. The front floor, middle floor, and rear floor are eliminated from the body to achieve high integration and high sealing with the upper box of the battery assembly, improving the space utilization of the vehicle; it can achieve high integration of electric vehicles and reliable fixing of battery modules into groups , to improve the integration performance, process performance, safety performance and service life of electric vehicles.

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.

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

2 is a schematic structural diagram of an upper box of a power battery assembly integrated with the overall floor of the vehicle body according to the present invention;

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

FIG. 4 is a schematic structural diagram I of a vehicle body structure of a power battery assembly integrated with the overall floor of the vehicle body according to the present invention;

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

In the figure: body structure 1, battery assembly 2, vehicle front suspension 3, vehicle rear suspension 4;

Body frame 101, front seat beam 102, rear seat beam 103, body floor 104;

The lower box floor 201 , the sealing structure 202 , the battery module 203 , the anti-collision structure 204 , and the upper box 205 .

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 FIG. 1 , this embodiment provides a power battery assembly integrated with the overall floor of the vehicle body, including:

The body structure 1 includes a body frame 101 , a front seat beam 102 , a rear seat beam 103 and a body floor 104 ; a body floor 104 is provided at the bottom of the body frame 101 , and a front seat beam 102 is integrated on the body floor 104 and rear seat beam 103;

The battery assembly 2 is fixed in the vacant structure provided on the body floor 104, and is integrated with the bottom of the body structure 1;

The vehicle front suspension 3 is fixed on the bottom of the body structure 1 and is located on the front side of the battery assembly 2;

The rear suspension 4 of the vehicle is fixed to the bottom of the body structure 1 and is located on the rear side of the battery assembly 2 .

As shown in FIG. 3 , the structure of the battery assembly 2 of this embodiment is described in detail. The battery assembly 2 includes:

The lower box floor 201, the lower box floor 201 is integrated with the battery liquid cold plate to realize the functions of bearing, fixing and thermal management of the battery module 203;

a sealing structure 202, the sealing structure 202 is arranged around the upper surface of the lower box floor 201;

The battery module 203, the battery module 203 is arranged in the frame enclosed by the lower box floor 201 and the sealing structure 202;

an anti-collision structure 204, the anti-collision structure 204 is arranged outside the sealing structure 202;

The upper box 205 is connected to the floor 201 of the lower box.

As shown in FIG. 3 , the battery modules 203 are arranged in groups of a plurality of battery cells, and form a side-by-side structure by bonding or other connection methods.

As shown in FIG. 4 and FIG. 5 , four doors and two covers are integrated on the body frame 101 .

The middle part of the vehicle body floor 104 is a hollowed out structure, and the hollow structure is used for fixing the battery assembly 2 .

The body floor 104 is made of high-strength and high-temperature-resistant metal materials, including but not limited to metal materials such as iron alloys, aluminum alloys, and titanium alloys.

The front seat beam 102 and the rear seat beam 103 are both fixed on the upper surface of the vacant structure of the vehicle body floor 104; the front seat beam 102 and the rear seat beam 103 are arranged in parallel.

The front seat beam 102 is connected to the upper box 205 of the battery assembly 2 through bolts, which can improve the overall battery mode; the rear seat beam 103 is connected to the upper box 205 of the battery assembly 2 through bolts, which can be Improve overall battery modal.

Example 2

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

Example 3

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

Step A: Determine the limit size of the lower box of the battery assembly according to the total energy CH required by the battery assembly and the limit installation GC of the body:

Step B: limit size area S=CH*CC*GC*exp(A)*0.895*exp(A) *exp(A)*sin(D), where CC is the structural coefficient related to the total energy of the battery, generally 0.76- 0.92; A is the weight compensation parameter, generally 0>A>-0.56; D is the integrated compensation parameter, generally 89°>D>65°;

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

Define the length C=S/(GB*E)*2/4*sin(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 89 °＞D＞65°;

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. A power battery assembly integrated with a vehicle body global floor, comprising:

a vehicle body structure (1) that includes a vehicle body frame (101), a front seat cross member (102), a rear seat cross member (103), and a vehicle body floor (104); a vehicle floor (104) is arranged at the bottom of the vehicle body framework (101), and a front seat cross beam (102) and a rear seat cross beam (103) are integrated on the vehicle floor (104);

the battery assembly (2) is fixed in a vacant structure arranged on a vehicle body floor (104) and integrated with the bottom of the vehicle body structure (1);

a vehicle front suspension (3) fixed to the bottom of the vehicle body structure (1) and located on the front side of the battery assembly (2);

and a vehicle rear suspension (4) fixed to the bottom of the vehicle body structure (1) and located on the rear side of the battery assembly (2).

2. A power battery assembly integrated with the vehicle body general floor according to claim 1, characterized in that said battery assembly (2) comprises:

the lower box body floor (201), the lower box body floor (201) is integrated with the battery liquid cooling plate, and the functions of bearing, fixing and heat management of the battery module (203) are realized;

a sealing structure (202), wherein the sealing structure (202) is arranged around the upper surface of the lower box body floor (201);

the battery module (203), the battery module (203) is arranged in a frame surrounded by the lower box body floor (201) and the sealing structure (202);

a collision-prevention structure (204), the collision-prevention structure (204) being arranged outside the seal structure (202);

and an upper box (205) connected to the lower box floor (201).

3. A power battery assembly integrated with a vehicle body general floor according to claim 2, wherein said battery module (203) is formed by arranging a plurality of battery cells in groups, and forming a side-by-side structure by means of bonding or the like.

4. A power battery assembly integrated with a vehicle body general floor according to claim 1, characterized in that said vehicle body frame (101) is integrated with four doors and two covers.

5. The power battery assembly integrated with the vehicle body general floor as claimed in claim 1, wherein the vehicle body floor (104) is of a hollow-out vacant structure in the middle, and the vacant structure is used for fixing the battery assembly (2); the material of the vehicle body floor (104) is iron alloy, aluminum alloy or titanium alloy.

6. A power battery assembly integrated with a vehicle body general floor according to claim 1, wherein the front seat cross member (102) and the rear seat cross member (103) are fixed to an upper surface of a vacant structure of a vehicle body floor (104); the front seat cross member (102) and the rear seat cross member (103) are arranged in parallel.

7. A power battery assembly integrated with a vehicle body general floor according to claim 1, characterized in that said front seat cross member (102) is connected with an upper box (205) of the battery assembly (2) by means of bolts; the rear seat cross member (103) is connected to an upper case (205) of the battery assembly (2) by a bolt.

8. An electric vehicle comprising a power battery assembly according to any one of claims 1 to 7 integrated with the vehicle body overall floor.

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

step A: determining the limit size of a lower battery box body of the battery assembly according to the total energy CH required by the battery assembly and the limit installation GC of the vehicle body:

and B: the ultimate size area S ═ CH ═ CC × (A) × 0.895 × (A) × exp (A) × sin (D), wherein CC is the structural coefficient related to the total energy of the cell; a is a weight compensation parameter; d is an integrated compensation parameter;

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

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

defining the width H of a lower box body of the battery to be S/A0.92, wherein CC is a structural coefficient related to the total energy of the battery, 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 CC in step B is 0.76-0.92, 0 > a > -0.56, 89 ° > D > 65 °; in step C, E is 1.23-1.83, 89 degree > D > 65 degree, 0 > A > -0.55, and CC is 0.8-0.85.

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