CN219811584U

CN219811584U - Battery pack

Info

Publication number: CN219811584U
Application number: CN202320080330.0U
Authority: CN
Inventors: 陈保国; 陈宝丽; 宋涛
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Jiewei Power Changxing Co ltd
Priority date: 2023-01-12
Filing date: 2023-01-12
Publication date: 2023-10-10
Anticipated expiration: 2033-01-12

Abstract

The utility model provides a battery pack, which comprises a box body, a plurality of modules, a BDU, a BMS main board and a BMS slave board, wherein the modules are arranged in the box body in two rows; the battery cells are stacked and arranged in the width direction of the module inside the module; wherein, the thickness of the battery cell is 8mm-16mm. The BDU and the BMS main board are arranged at the front end of the box body; BMS slave plate sets up between two rows of modules to be located on the longeron of box bottom. The battery pack increases the charging rate of a battery system; meanwhile, the battery system structure is square in shape, the module arrangement is simple, the electric quantity is increased without changing the length and width direction of the battery core, the thickness of the battery core is increased only by increasing the number of layers of the battery core lamination, the change of tools and equipment used in the production of the battery core is small, the thickness of the lamination is only increased, the manufacturing cost and the maintenance cost are low, the production is simple, and the quality is ensured; and the liquid cooling system is arranged in a single layer, and the layout is simple.

Description

Battery pack

Technical Field

The utility model belongs to the field of soft-package cell power battery systems, and particularly relates to a battery pack.

Background

At present, the voltage of a battery system consisting of the existing soft package battery cells is 400V, the charging power is low, and the charging speed is low; if the fast charge rate is required to be improved, the voltage is improved to 800V, then the withstand voltage of all electric components in the battery pack system needs to be improved, the insulativity of all electric components needs to be improved, the electric components need to be selected and designed again, the arrangement size and position need to be changed, the design cost is increased, and the design period is prolonged; in addition, the existing battery pack system is generally designed for a certain vehicle type, if the electric quantity is required to be increased, all structural components in the battery pack system need to be redesigned, and meanwhile, verification experiments such as performance, safety and the like need to be carried out again, so that a large amount of verification time and verification cost are required to be consumed. Therefore, there is a need for a battery system structure that has certain compatibility while improving the power.

Disclosure of Invention

In view of the foregoing, the present utility model is directed to a battery pack that has certain compatibility while improving the power.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a battery pack includes a case, a plurality of modules, a BDU, a BMS main board, and a BMS slave board,

the modules are arranged in the box body in two rows;

the battery cells are stacked and arranged in the module along the width direction of the module; wherein the thickness of the battery cell is 8mm-16mm.

The BDU and the BMS main board are arranged at the front end of the box body;

the BMS slave plates are arranged between the two rows of modules and are positioned on longitudinal beams at the bottom of the box body.

Further, each row is provided with eight modules, and the two rows of modules are mutually parallel and aligned one by one.

Further, two BMS slave plates are arranged between the two rows of modules.

Further, the battery cell is a soft-package battery cell, and the battery cell is made of a nickel-cobalt-manganese ternary material.

Furthermore, the box body is of a regular square structure, and the box body is made of aluminum materials.

Optionally, the length, width and height of the battery cell are 306mm x 103mm x 8mm respectively, and the length, width and height of the battery pack are 1452mm x 965mm x 147.4mm respectively.

Optionally, the length, width and height of the battery cell are 306mm x 103mm x 11.6mm respectively, and the length, width and height of the battery pack are 1840mm x 965mm x 147.4mm respectively.

Optionally, the length, width and height of the battery cell are 306mm x 103mm x 16mm respectively, and the length, width and height of the battery pack are 2315mm x 965mm x 147.4mm respectively.

Compared with the prior art, the battery pack has the following beneficial effects:

(1) According to the battery pack, according to the formula P=UI, the charging voltage is increased, the corresponding charging power is increased, and the charging rate of a battery system is increased; meanwhile, the battery pack has square shape, simple module arrangement, simple production and quality assurance, and the length and width direction of the battery core do not need to be changed by increasing the electric quantity, only the number of layers of the battery core lamination is increased, the thickness of the battery core is increased, and the tooling and equipment used by the battery core in production have small change, only the lamination thickness is increased, the manufacturing cost and the maintenance cost are low, and the battery pack is simple to produce; and the liquid cooling system is arranged in a single layer, and the layout is simple.

(2) The design scheme of the battery pack is systematically verified, the performance and the safety reliability of a battery system are high, a large number of tests are not needed for verification, and the verification cost is low.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 is a schematic view of a battery pack according to an embodiment of the present utility model.

Reference numerals illustrate:

1-a box body; 2-module; 3-an electric core; 4-BDU; a 5-BMS main board; 6-BMS slave plates; 7-longitudinal beams.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

The core of the quick charging technology is to increase the charging power of the whole vehicle, and the technical means is to increase the charging current or increase the charging voltage, because p=u×i (P is the charging power, U is the charging voltage, and I is the charging current), and the charging power, the charging current and the charging voltage are in a direct proportion relation. The increased charging current means a thicker and heavier harness, more heat generation and more bottlenecks for accessory devices, while the increased charging voltage has more design freedom. The voltage range of the current main stream new energy whole vehicle high-voltage electrical system is generally 230V-450V, the middle value is 400V, and the cage is generally called as a 400V system; in order to accelerate the charging rate of the power battery and improve the charging power of the power battery, the voltage range of the whole vehicle high-voltage electric system can reach 550-930V, the middle value is 800V, and the cage is generally called as an 800V system. The scheme introduces a design scheme of the battery system, which converts the voltage of the battery system from 400V to 800V and can easily expand the electric quantity, so that the charging power can be improved, and the requirement of customers on the electric quantity can be met.

In addition, in the popularization process of new energy automobiles, the cruising and charging speeds are two short plates. Compared with the fuel oil vehicle, most of the new energy vehicles have a range of less than 600 km and are generally lower than the range of the fuel oil vehicle, so that the inter-city long-range driving requirement is difficult to meet. On the other hand, existing charging techniques require consumers to wait 40 minutes or even longer before filling, whereas the refueling process of a fuel vehicle requires only 5 minutes, in contrast to the lower energy efficiency. The endurance mileage and the charging speed are two short plates, and the substitution of the new energy automobile for the fuel oil automobile is restricted. Therefore, the key of improving the electric quantity of the battery system and accelerating the charging speed of the battery system is the popularization of new energy automobiles.

Generally, the same vehicle model has different configurations, which correspond to different requirements of customers on high, medium and low configurations of the vehicle, wherein for a new energy vehicle, the high or low power of the power battery (corresponding to the range of the vehicle) is a key index of the vehicle configuration. The power battery is preferably designed such that the power battery system has a variation in size in a certain direction, but preferably has no variation in other sizes and components. In general, the width and the height of a vehicle are fixed when the vehicle is designed, even if the vehicle is changed, the vehicle width is determined when the vehicle level is determined at the beginning of the vehicle design, if the vehicle width is changed, a plurality of systems such as a suspension system are changed, the safety is related to the ground clearance in the height direction, and the length of the vehicle in the running direction can reserve more space for the power battery system due to the arrangement of components, so that the dimensions of the Y direction and the Z direction are unchanged, the dimension of the X direction is increased, and the electric quantity is increased corresponding to the power battery system. And the change only brings the size change of the module 2 and the box 1 in the X direction, but the BDU4, the BMS main board 5, the BMS slave board 6 and the mounting point in the interior are not changed, so that the development cost of the battery system is reduced.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Fig. 1 is a schematic view of a battery pack according to an embodiment of the utility model.

The battery pack comprises a box body 1, a plurality of modules 2, BDU4, BMS main boards 5 and BMS slave boards 6.

The modules 2 are arranged in the box body 1 in two rows;

the battery cells 3 are stacked and arranged in the module 2 along the width direction of the module 2; wherein the thickness of the battery cell 3 is 8mm-16mm. The thickness of the specific battery cell is set according to actual design requirements.

BDU4 and BMS mainboard 5 set up in the front end of box 1 to do not occupy the inner structure of box 1, make the inside module of box 1 arrange more rationally.

The BMS slave plates 6 are arranged between the two rows of modules 2 and are positioned on longitudinal beams 7 at the bottom of the box body 1. The longitudinal beam 7 is arranged at the middle position of the bottom of the box body 1 and is longitudinally arranged along the box body 1 so as to increase the structural strength of the box body 1.

In the utility model, eight modules 2 are arranged in each row, two rows of modules 2 are parallel to each other, and the modules 2 in two rows are aligned one by one, so that the arrangement of the modules 2 is more neat.

Specifically, two BMS slave boards 6 are provided between the two rows of modules 2.

Preferably, the battery cell 3 is a soft-package battery cell, and the battery cell 3 is made of a nickel-cobalt-manganese ternary material. In other embodiments, the battery cell 3 may be a hard-shell battery cell, and the battery cell 3 may be made of other materials.

Preferably, the box 1 has a regular square structure, so that the box 1 is easier to install on a vehicle, the box 1 is made of aluminum, and the weight of the box 1 is reduced on the premise of ensuring the structural strength.

It should be noted that, the box body 1 of the battery pack disclosed by the utility model adopts an aluminum profile design, so that the safety of the internal module 2 and the battery core 3 can be protected; two rows of modules 2 are arranged in order in the box body 1 to provide electricity for a vehicle; the BMS slave boards 6 acquire signals of voltage, current, temperature and the like of the current core 3, so that the BMS main board 5 is convenient to control and adjust the working state of the current core 3, and as the voltage of the 800V system is increased, the electric quantity is expanded, the acquisition paths are increased by 1 time compared with a 400V system, the number of the BMS slave boards 6 is increased to 2, the acquisition module chips on the PCB inside the BMS slave boards 6 are increased, the voltage acquisition paths are at least 216 paths, and the temperature acquisition paths are at least 36 paths; the BMS main board 5 processes signals collected by the BMS slave board 6, and because of the increased electric quantity expansion of the 800V system voltage, a chip with higher insulation and voltage resistance level (such as alternating current voltage 2700V and direct current voltage 4000V) needs to be selected in the BMS main board 5, and the electric gap and the creepage distance are considered in the PCB design; the BDU4 distributes high voltage, ensures high voltage safety, and because 800V system voltage increases electric quantity expansion, main relays, pre-charging relays and pre-charging resistors which are selected in the BDU4 need to be selected from devices with higher insulation and voltage-resistant grades (such as alternating current voltage 2700V and direct current voltage 4000V). The number of the internal modules 2 of the battery pack system is 16, and each row is 8. The total voltage of the battery pack system is 788.4V, the grouping mode of the battery cells 3 is 1 and 216 strings, and the material of the battery cells 3 is nickel-cobalt-manganese ternary material.

The battery pack increases the size of the battery system in the X direction by increasing the thickness of the battery cell 3.

In one embodiment of the present utility model, when the size of the battery cell 3 is 306mm×103mm×8mm, the capacity of the battery cell 3 may be designed to be 25.5Ah, the total electric quantity of the battery pack system is 20kWh, the range of the vehicle is estimated to be 142km, and the outer envelope size of the battery pack system is 1452mm×965mm×147.4mm.

The length and width dimensions of the battery cell 3 are not changed, 306mm is continuously kept, 103mm is continuously kept, only the dimension of the thickness direction of the battery cell 3 is increased from 8mm to 11.6mm, then the capacity of the battery cell 3 can be designed to be 37Ah, the total electric quantity of a battery pack system can be increased to 29.2kWh, the range of a vehicle is estimated to be 208km, and the outer envelope dimension of the battery pack system is 1840mm by 965mm by 147.4mm.

The length and width dimensions of the battery cell 3 are not changed, 306mm is continuously kept, 103mm is continuously kept, only the dimension of the thickness direction of the battery cell 3 is increased from 11.6mm to 16mm, then the capacity of the battery cell 3 can be designed to be 51Ah, the total electric quantity of a battery pack system can be increased to 40.2kWh, the range of a vehicle is estimated to be 287km, and the outer envelope dimension of the battery pack system is 2315mm by 965mm by 147.4mm.

According to the battery pack, according to the formula P=UI, the charging voltage is increased, and the corresponding charging power is increased, so that the charging rate of a battery system is increased; meanwhile, the novel battery pack is square in shape, the module 2 is simple to arrange, the length and width direction of the battery core 3 are not required to be changed when the electric quantity is increased, the thickness of the battery core 3 is increased only by increasing the number of layers of the battery core lamination, the change of tools and equipment used by the battery core 3 in production is small, the thickness of the lamination is only increased, the manufacturing cost and the maintenance cost are low, the production is simple, and the quality is ensured; and the liquid cooling system is arranged in a single layer, and the layout is simple.

The battery pack provided by the utility model has the advantages that through systematic verification, the performance and the safety reliability of the battery system are high, a large number of tests are not needed for verification, and the verification cost is low.

The design scheme of the battery pack is systematically verified, the performance and the safety reliability of a battery system are high, a large number of tests are not needed for verification, and the verification cost is low.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model, and are intended to be included within the scope of the appended claims and description.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. A battery pack, characterized in that: comprises a box body (1), a plurality of modules (2), a BDU (4), a BMS main board (5) and a BMS slave board (6),

the modules (2) are arranged in the box body (1) in two rows;

the battery cells (3) are stacked and arranged in the module (2) along the width direction of the module (2); wherein the thickness of the battery cell (3) is 8mm-16mm;

the BDU (4) and the BMS main board (5) are arranged at the front end of the box body (1);

the BMS slave plates (6) are arranged between the two rows of modules (2) and are positioned on longitudinal beams (7) at the bottom of the box body (1).

2. A battery pack according to claim 1, wherein: eight modules (2) are arranged in each row, and the two rows of modules (2) are parallel to each other and are aligned one by one.

3. A battery pack according to claim 1, wherein: two BMS slave plates (6) are arranged between the two rows of modules (2).

4. A battery pack according to claim 1, wherein: the battery cell (3) is a soft-package battery cell, and the battery cell (3) is made of a nickel-cobalt-manganese ternary material.

5. A battery pack according to claim 1, wherein: the box body (1) is of a regular square structure, and the box body (1) is made of aluminum materials.

6. A battery pack according to claim 1, wherein: the length, width and height of the battery cell (3) are 306mm 103mm 8mm respectively, and the length, width and height of the battery pack are 1452mm 965mm 147.4mm respectively.

7. A battery pack according to claim 1, wherein: the length, width and height of the battery cell (3) are 306mm x 103mm x 11.6mm respectively, and the length, width and height of the battery pack are 1840mm x 965mm x 147.4mm respectively.

8. A battery pack according to claim 1, wherein: the length, width and height of the battery cell (3) are 306mm, 103mm and 16mm respectively, and the length, width and height of the battery pack are 2315mm, 965mm and 147.4mm respectively.