WO2021208969A1

WO2021208969A1 - Power battery pack and vehicle

Info

Publication number: WO2021208969A1
Application number: PCT/CN2021/087246
Authority: WO
Inventors: 潘福中; 占莉; 刘彬
Original assignee: 宁波吉利汽车研究开发有限公司; 浙江吉利控股集团有限公司
Priority date: 2020-04-16
Filing date: 2021-04-14
Publication date: 2021-10-21
Also published as: CN111613745A; CN111613745B

Abstract

A power battery pack and a vehicle. The power battery pack comprises a tray (1), a cover plate (2) and a battery array (3). The cover plate (2) covers the tray (1) to form an accommodation cavity, the accommodation cavity comprises a pressure relief area (101), a battery placement region (102), and an electrical connection region (103), and the pressure relief area (101) and the electrical connection region (103) are disposed on two sides of the battery placement region (102), respectively. The battery array (3) is disposed within the battery placement region (102), explosion-proof valves (301) of the battery array (3) correspond to the pressure relief area (101), tabs (302) of the battery array (3) correspond to the electrical connection region (103), and the cover plate (2) abuts against the battery array (3).

Description

Power battery pack and vehicle

Technical field

The present invention relates to the technical field of batteries, in particular to a power battery pack and a vehicle.

Background technique

The battery pack is the core component of an electric vehicle, which is mainly composed of a number of single batteries, battery trays or supporting structures, upper cover, thermal management framework, battery management and executive components.

Since the car needs to ensure the ground clearance and the space of the internal passenger compartment, as the height of the vehicle is continuously decreasing to reduce wind resistance and energy consumption, the height space left for the battery pack is becoming more and more limited. Therefore, in this limited space How to improve the energy density of battery packs has become an important research direction in the field of battery technology.

The traditional square single battery generally maintains the posture of the tab and the explosion-proof valve at the upper part. The connection and signal acquisition space of the tab and the pressure relief space of the explosion-proof valve need to be reserved above the battery, which squeezes out the energy provided by the single battery. The height of the space, and wasted valuable battery pack height space.

In addition, the explosion-proof valve and the output tab are in the same direction. When the internal heat of the battery is out of control, the high-temperature and high-pressure gas, solids, flames, etc. ejected from the explosion-proof valve will directly damage key electrical connections, temperature and voltage sampling and other components. At the same time, it is easy to damage the upper cover above the battery, directly thermally affect the bottom of the car, and ultimately pose a threat to the safety of the occupants.

Summary of the invention

The purpose of the present application is to provide a power battery pack and a vehicle to solve the problems in the prior art that the capacity density of the battery pack is limited by the height and the chain thermal runaway reaction.

In order to solve the above technical problems, this application provides a power battery pack, which includes a tray, a cover plate and a battery array;

The cover plate is arranged on the tray to form an accommodating cavity. The accommodating cavity includes a pressure relief area, a battery placement area, and an electrical connection area. The pressure relief area and the electrical connection area are respectively provided on the battery Both sides of the array placement area;

The battery array is arranged in the battery placement area, the explosion-proof valve of the battery array corresponds to the pressure relief area, the tabs of the battery array correspond to the electrical connection area, and the cover plate abuts against the Battery array.

Optionally, the battery array is composed of a plurality of electric cores, and each of the electric cores is provided with an explosion-proof valve and a pair of the tabs.

Optionally, the cell has a rectangular parallelepiped structure, the cell has a length L, a width H, and a thickness D, and the length L is greater than the width H, and the width H is greater than the thickness D.

Optionally, the explosion-proof valve is provided on a first surface corresponding to the width H and the thickness D, and the tab is provided on a second surface corresponding to the width H and the thickness D.

Optionally, the battery array has at least one row and at most two columns, and one unit of the battery array includes a plurality of the battery cells.

Optionally, the battery array has three rows and two columns. In the two columns, the explosion-proof valves of the batteries in each column are arranged in the same direction, and the batteries in the two columns are arranged in the same direction. The tabs of the core are arranged opposite to each other.

Optionally, the battery array has one row and two columns. In the two columns, the explosion-proof valves of the cells in each column are arranged in the same direction, and the cells in the two columns are arranged in the same direction. The tabs are arranged opposite to each other.

Optionally, the accommodating cavity includes two pressure relief areas and one electrical connection area;

The explosion-proof valves of the two rows respectively correspond to one pressure relief area, and the tabs of the two rows share the same electrical connection area.

Optionally, the tray and/or the cover plate is integrated with a liquid cooling system.

The application also provides a vehicle, including any of the above-mentioned power battery packs.

By adopting the above technical solution, this application has the following beneficial effects:

1) The power battery pack of the present application reduces the impact of the explosion-proof valve on the tabs by setting separate pressure relief areas and electrical connection areas, and can effectively avoid the chain thermal runaway reaction caused by high-temperature and high-pressure gas, solids or flames emitted by the explosion-proof valve;

2) The power battery pack of the present application makes full use of the height space, which can effectively increase the useful energy of a single battery cell, thereby improving the overall energy density of the battery pack;

3) The cover plate of the power battery pack of the present application directly abuts the battery array, and the liquid cooling system is integrated in the cover plate, so that the cover plate can also be used as the heat dissipation surface or heat preservation surface of the battery pack, which can effectively improve the heat dissipation performance of the battery pack And thermal insulation performance.

Description of the drawings

In order to explain the technical solutions in the embodiments of the present invention more clearly, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is an exploded schematic diagram of an optional power battery pack according to an embodiment of the application;

FIG. 2 is a schematic structural diagram of an optional battery core according to an embodiment of the application;

FIG. 3 is a schematic structural diagram of an optional battery array according to an embodiment of the application;

FIG. 4 is a schematic structural diagram of an optional battery array according to an embodiment of the application;

FIG. 5 is a schematic structural diagram of an optional battery array according to an embodiment of the application.

The following is a supplementary explanation to the attached drawings:

1-tray; 2-cover plate; 3-battery array; 101-pressure relief area; 102-battery placement area; 103-electrical connection area; 104-pressure relief hole; 301-explosion-proof valve; 302-tab; 303- Batteries.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure, or characteristic that can be included in at least one implementation of the present invention. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", etc. It is convenient to describe the present invention and simplify the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in a sequence other than those illustrated or described herein.

Please refer to FIG. 1. FIG. 1 is an exploded schematic diagram of an optional power battery pack according to an embodiment of the present application. In FIG. 1, the power battery pack includes a tray 1, a cover plate 2 and a battery array 3;

The cover plate 2 is arranged on the tray 1 to form an accommodating cavity (not shown in Figure 1, please refer to Figure 3). The accommodating cavity includes a pressure relief area 101, a battery placement area 102, and an electrical connection area 103. The pressure relief area 101 And the electrical connection area 103 are respectively provided on both sides of the battery array placement area 102;

The battery array 3 is disposed in the battery placement area 102, the explosion-proof valve 301 of the battery array 3 corresponds to the pressure relief area 101, the tabs 302 of the battery array 3 correspond to the electrical connection area 103, and the cover plate 2 abuts the battery array 3.

In a specific implementation, a thermally conductive structural glue can be added between the cover plate 2 and the battery array 3 to fix heat conduction, so as to increase the heat dissipation performance of the cover plate 2, while the traditional battery pack only dissipates heat through the tray; the cover plate 2 and the battery array 3 There is no wasted space between, and full utilization of the height space is realized, which is beneficial to increase the energy density of the battery pack.

As an optional implementation, the battery array 3 shown in FIG. 1 is composed of a number of cells 303, and each cell 303 is provided with an explosion-proof valve 301 and a pair of lugs 302 (as shown in FIG. 2) , The pair of tabs includes a positive tab and a negative tab.

As an optional embodiment, the battery core 303 has a rectangular parallelepiped structure, the battery core 303 has a length L, a width H, and a thickness D, and the length L is greater than the width H, the width H is greater than the thickness D, and the battery core 303 is a long strip as a whole Compared with the traditional battery cell, it has a larger length size, and the energy density of the battery cell and the battery pack is increased by lengthening the size of the battery cell; the explosion-proof valve 301 is set on the first surface corresponding to the width H and the thickness D, and the lug 302 Set on the second surface corresponding to the width H and the thickness D, that is, as shown in FIG.

As an optional embodiment, the battery array 3 has at least one row and at most two columns, and one unit of the battery array 3 includes a plurality of battery cells 303.

In order to ensure that the explosion-proof valve of each row of cells does not affect the tabs of the other row of cells, in the following embodiments, the number of rows of the battery array 3 does not exceed two.

As an optional embodiment, the battery array 3 has three rows and two columns. In the two columns, the explosion-proof valves 301 of the battery cells 303 in each column are arranged in the same direction, and the battery cells 303 in the two columns are arranged in the same direction. The lugs 302 are arranged oppositely, and the lugs are arranged oppositely to facilitate electrical connection.

In a specific implementation, as shown in Figure 3, the elongated batteries 303 are arranged on the tray 1 in a side-lying manner. The batteries 303 can be bonded to the tray 1, and heat can also be increased between the batteries 303 and the tray 1. Interface material to improve the thermal conductivity; the cells 303 form a 3×2 battery array 3, in which the explosion-proof valves 301 of the first row of cells 303 are arranged toward the first side of the tray 1, and the explosion-proof valves 301 of the second row of cells 303 Arranged toward the second side of the tray 1, the tabs 302 of the first row of cells 303 and the tabs 302 of the second row of cells 303 are arranged oppositely.

Correspondingly, there are two pressure relief areas 101 on the tray 1 corresponding to the first row of battery explosion-proof valves and the second row of battery explosion-proof valves. There is a first battery placement area 102 (place the first row of cells), an electrical connection area 103, and a second battery placement area 102 (place the second row of batteries), so that the electrical connection area 103 is located in the middle of the battery pack It can avoid the side collision of the battery pack and squeeze the tabs, thereby avoiding electrical safety events such as short circuits. The pressure relief area 101 is divided into two sides of the battery pack, which can effectively reduce the impact of the explosion-proof valve on the tabs and electrical connections and improve the battery pack’s Safety performance.

In addition, the tray 1 is also provided with a number of longitudinal beams and beams, which are used to separate each unit in the battery array 3, provide support for the battery pack, and increase the overall structural strength; the frame and beams of the tray 1 are also provided with pressure relief holes 104. The position of the pressure relief hole 104 should correspond to the pressure relief area 101 to form a pressure relief channel. When the explosion-proof valve of a cell emits high-temperature and high-pressure gas, solid or flame, it can be discharged through the pressure relief channel to prevent influence More cells can cause a thermal runaway chain reaction; in the electrical connection area 103, non-metallic materials can also be used to provide support and insulation for the electrical connectors, and provide necessary limits for the components of the cells.

As an optional embodiment, the battery array 3 has one row and two columns. In the two columns, the explosion-proof valves 301 of the cells 303 in each column are arranged in the same direction, and the poles of the cells 303 in the two columns are arranged in the same direction. The ears 302 are arranged opposite to each other.

In specific implementation, as shown in FIG. 4, the difference from the battery array shown in FIG. 3 is that the tray 1 in FIG. .

In a specific implementation, the battery array can also be shown in Figure 5. The battery cells 303 form a 3×1 battery array 3, that is, there is only one row of battery cells. Correspondingly, only one pressure relief area 101 is provided on the tray 1. The pressing area 101 and the electrical connection area 103 are separately provided on both sides of the tray 1.

In specific implementation, the power battery pack of the embodiment of the present application may also include an external electrical module. The external electrical module includes but is not limited to: battery management system BECM, current collection device CSC and relay, insurance FUSE, precharge resistor, connection The external electrical module can be a whole or divided into more than one module, which is placed outside the battery pack. It is connected to the outside of the tray or cover through movable installation, such as threaded connection, etc., which can be disassembled separately when needed, which is convenient for maintenance and replacement.

As an optional embodiment, the tray 1 and/or the cover plate 2 are integrated with a liquid cooling system.

The battery pack cover is used as a heat dissipation plate for battery thermal management. Since the cover is close to the bottom of the vehicle body, instead of being exposed to the air under the chassis of the car like the bottom of the tray, the airflow of the general vehicle will also accelerate the heat dissipation of the bottom of the tray. The battery pack is susceptible to external heat, while the cover plate used as the heat dissipation plate for battery thermal management is not susceptible to external airflow, which can improve the thermal insulation performance of the battery pack.

An embodiment of the present application also provides a vehicle, which includes any of the above-mentioned power battery packs.

The power battery pack and the vehicle according to the embodiments of the present application have the following beneficial effects:

The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection of the present invention. Within range.

Claims

A power battery pack, which is characterized by comprising a tray (1), a cover plate (2) and a battery array (3);

The cover plate (2) is arranged on the tray (1) to form an accommodating cavity. The accommodating cavity includes a pressure relief area (101), a battery placement area (102), and an electrical connection area (103). The pressure relief area (101) and the electrical connection area (103) are respectively provided on both sides of the battery array placement area (102);

The battery array (3) is arranged in the battery placement area (102), the explosion-proof valve (301) of the battery array (3) corresponds to the pressure relief area (101), and the battery array (3) The tab (302) corresponds to the electrical connection area (103), and the cover plate (2) abuts the battery array (3).
The power battery pack according to claim 1, characterized in that, the battery array (3) is composed of a plurality of electric cores (303), and each of the electric cores (303) is provided with an explosion-proof valve ( 301) and a pair of said tabs (302).
The power battery pack according to claim 2, characterized in that the battery core (303) has a rectangular parallelepiped structure, the battery core (303) has a length L, a width H and a thickness D, and the length L is greater than the length L The width H is greater than the thickness D.
The power battery pack according to claim 3, wherein the explosion-proof valve (301) is provided on the first surface corresponding to the width H and the thickness D, and the tab (302) is provided on the first surface corresponding to the width H and the thickness D. The width H and the thickness D correspond to the second surface.
The power battery pack according to claim 2, wherein the battery array (3) has at least one row and at most two columns, and one unit of the battery array (3) includes a plurality of the battery cells (303).
The power battery pack according to claim 5, characterized in that the battery array (3) has three rows and two columns, and in the two columns, all the cells (303) in each column are The explosion-proof valves (301) are arranged in the same direction, and the tabs (302) of the batteries (303) of the two rows are arranged opposite to each other.
The power battery pack according to claim 5, characterized in that the battery array (3) has one row and two columns, and in the two columns, the battery cell (303) of each column The explosion-proof valves (301) are arranged in the same direction, and the tabs (302) of the batteries (303) of the two rows are arranged opposite to each other.
The power battery pack according to claim 6 or 7, wherein the accommodating cavity includes two pressure relief areas (101) and one electrical connection area (103);

The explosion-proof valves (301) of the two rows respectively correspond to one pressure relief area (101), and the tabs (302) of the two rows share one electrical connection area (103).
The power battery pack according to claim 1, wherein the tray (1) and/or the cover plate (2) is integrated with a liquid cooling system.
A vehicle, characterized by comprising the power battery pack according to any one of claims 1-9.