Battery pack and electric vehicle

Abstract

The utility model provides a battery pack and an electric car, which belongs to the technical field of batteries, and comprises a box cover, a box body assembly and a bottom protective plate, the box cover is arranged on the upper surface of the box body assembly, and the bottom protective plate is arranged on the lower surface of the box body assembly; the box body assembly comprises a box body frame, and a first constraint beam, a second constraint beam and a third constraint beam are arranged in the box body frame. According to the utility model, the first constraint beam, the second constraint beam and the third constraint beam are arranged in the box body frame to replace traditional fasteners, so that the utilization rate of the interior of the battery pack is improved; and meanwhile, a bottom protection plate is arranged, so that the battery pack is protected when the bottom of the electric automobile is scratched and impacted in the running process.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field, especially relate to a battery pack and electric car. BACKGROUND

[0002] With the world countries for energy saving and emission reduction policy's vigorous implementation, in the automobile industry, new energy vehicles have obtained the rapid development, and power battery as new energy vehicles'heart, its technical level development has important significance to new energy industry and automobile manufacturing industry. But electric vehicle driving process, often appear electric vehicle bottom scratch and electric vehicle impact situation, how to guarantee the battery pack of electric vehicle in the bottom scratch and impact does not occur fire and explosion has become the most important problem, at the same time in some long distance, electric vehicle needs to charge several times to complete the journey, in order to improve the capacity of on-board loaded battery, improve the internal space utilization rate of battery pack is also the urgent problem to be solved.

[0003] Therefore, how to guarantee the internal space utilization rate of battery pack is improved and the safety of battery pack is guaranteed is an important technical problem to be solved urgently. INVENTION CONTENTS

[0004] In view of the above problems, the utility model provides a kind of battery pack, including box cover, box body assembly and bottom guard plate, the upper surface of box body assembly is equipped with box cover, and the lower surface of box body assembly is equipped with bottom guard plate;

[0005] The box body assembly includes box body frame, and the first constraint beam, the second constraint beam and the third constraint beam are arranged inside the box body frame.

[0006] Further, the battery pack further includes a first module assembly, a second module assembly and a copper bar assembly;

[0007] The first module assembly is installed in the space surrounded by the first constraint beam, the second constraint beam and the box body frame, and the second module assembly is installed in the space surrounded by the second constraint beam, the third constraint beam and the box body frame.

[0008] The first module assembly and the second module assembly are electrically connected through the copper bar assembly.

[0009] Further, the outer surface of the box body frame is provided with an angle steel near the position of the bottom guard plate.

[0010] Further, the outer surface of the box body frame is provided with a welding lug, a secondary positioning pin and a primary positioning pin, the secondary positioning pin is installed between the two adjacent welding lugs on the first side surface of the box body frame, and the primary positioning pin is installed between the two adjacent welding lugs on the second side surface of the box body frame.

[0011] The boss bush is fixedly installed on the upper surface of the welding lug.

[0012] Further, the copper bar assembly comprises a fast-charging copper bar, the fast-charging copper bar comprises a first connecting head, a connecting rod and a second connecting head connected in sequence, the connecting rod is installed on the upper surfaces of the first module assembly and the second module assembly, the first connecting head is electrically connected with a fast-charging plug, and the second connecting head is electrically connected with the first module assembly and / or the second module assembly.

[0013] Further, the first connecting head and the second connecting head are made of copper, and the connecting rod is made of aluminum; the first connecting head and the second connecting head are respectively lap-welded with two ends of the connecting rod.

[0014] Further, the battery pack further comprises a liquid cooling plate assembly, the liquid cooling plate assembly is arranged between the box assembly and the bottom guard plate, and upper surfaces of the liquid cooling plate assembly are in contact with lower surfaces of the first module assembly and the second module assembly.

[0015] Further, the liquid cooling plate assembly comprises a flat plate and a flow channel plate, a recess is arranged on an upper surface of the flow channel plate, and the flat plate is installed on the upper surface of the flow channel plate.

[0016] Further, foam is arranged between the liquid cooling plate assembly and the bottom guard plate.

[0017] An electric car comprises a car body and the battery pack, and the battery pack is installed in the car body.

[0018] Advantages:

[0019] 1. The first constraint beam, the second constraint beam and the third constraint beam arranged in the box frame improve the utilization rate of the battery pack, and the bottom guard plate protects the battery pack when the electric car is scratched and hit.

[0020] 2. The angle steel arranged on the outer surface of the box frame near the bottom guard plate is made of B340 high-strength steel, and the bottom of the battery pack is protected (when the electric car is scratched and hit, the angle steel can protect the battery pack).

[0021] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be understood from the practice of the present application. The purpose and other advantages of the present application can be achieved and obtained by the structure indicated in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 The overall schematic diagram of the battery pack in the embodiment of the present application is shown.

[0024] Figure 2 The installation schematic diagram of the box assembly and the bottom guard plate of the battery pack in the embodiment of the present application is shown.

[0025] Figure 3 The partial cross-sectional schematic diagram of the flow channel plate, the box assembly and the bottom guard plate of the battery pack in the embodiment of the present application is shown.

[0026] Figure 4 The structural schematic diagram of the fast charging copper bar of the battery pack in the embodiment of the present application is shown.

[0027] Figure 5 The position schematic diagram of the flat plate, the flow channel plate and the foam of the battery pack in the embodiment of the present application is shown.

[0028] In the figure, 10, box cover; 20, first module assembly; 30, second module assembly; 40, liquid cooling plate assembly; 41, flat plate; 42, flow channel plate; 50, box assembly; 501, first constraint beam; 502, first electrical compartment; 503, second constraint beam; 504, welded lifting lug; 505, box frame; 506, auxiliary positioning pin; 507, boss bushing; 508, third constraint beam; 509, second electrical compartment; 510, angle steel; 511, bolt; 512, main positioning pin; 60, bottom guard plate; 70, copper bar assembly; 71, first connecting head; 72, connecting rod; 73, second connecting head; 74, fast charging copper bar; 80, foam. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] Embodiment 1,

[0031] ReferenceFigure 1 , Figure 1 The utility model discloses a whole schematic diagram of battery pack in the embodiment. A battery pack, including box cover 10, box body assembly 50 and bottom guard plate 60, wherein the material of box cover 10 is super deep stamping cold-rolled steel plate DC06, has the characteristics of good strength and low die development cost, the box body assembly 50 is hollow box body, the upper surface of box body assembly 50 is installed with box cover 10, and the lower surface of box body assembly 50 is installed with bottom guard plate 60.

[0032] Box body assembly 50 includes box body frame 505, and the inside of box body frame 505 is provided with first constraint beam 501, second constraint beam 503 and third constraint beam 508. Box body assembly 50 is made by roller pressing die of high-strength cold-rolled steel. Bottom guard plate 60 is arranged on the lower surface of box body assembly 50, and then bottom guard plate 60 protects the battery pack. Bottom guard plate 60 adopts HC950 (yield strength greater than or equal to 950MPa) hot-formed steel.

[0033] Specifically, referring to Figure 2 , first constraint beam 501 and box body frame 505 form first electrical compartment 502, and third constraint beam 508 and box body frame 505 form second electrical compartment 509. Specifically, first electrical compartment 502 and second electrical compartment 509 are used to place electrical components or wires.

[0034] The utility model discloses a first constraint beam 501, second constraint beam 503 and third constraint beam 508 are arranged in the inside of box body frame 505, which replaces and reduces the use of part of traditional fasteners, thereby improving the utilization rate of the inside of the battery pack, and bottom guard plate 60 is arranged, thereby protecting the battery pack when the electric vehicle encounters bottom scratching and impact during driving, and ensuring the safety of the battery pack.

[0035] In the above embodiment, optionally, another embodiment is that box body frame 505 is made by roller pressing die of high-strength cold-rolled steel (such as DP780, HC340, etc.), and is formed by welding of cross-section sectionals formed by roller pressing die, wherein the front frame and the rear frame share a set of roller pressing die, the left frame and the right frame share a set of roller pressing die, and each cross-section sectional is a closed cavity, and the cost price thereof is 0.3-0.4 times of aluminum alloy, which greatly reduces the cost of the battery pack and improves the production efficiency of box body frame 505.

[0036] The utility model discloses in the embodiment, the battery pack still includes first module assembly 20, second module assembly 30 and copper bar assembly 70, further, first module assembly 20 and second module assembly 30 are all using CTP (Cell to Pack, no module technology) structure, the application of CTP (Cell to Pack, no module technology) module greatly reduces the use of fastener, improves production assembly efficiency and improves the space utilization of battery pack.

[0037] The utility model discloses in the embodiment, CTP (Cell to Pack, no module technology) is a kind of innovative battery pack integration technology, by canceling traditional battery module structure, directly integrate Cell into Pack, significantly improve energy density, reduce cost and optimize space utilization.

[0038] The utility model discloses in the embodiment, first module assembly 20 is installed in the space surrounded by first constraint beam 501, second constraint beam 503 and box frame 505, second module assembly 30 is installed in the space surrounded by second constraint beam 503, third constraint beam 508 and box frame 505;First module assembly 20 and second module assembly 30 are electrically connected by copper bar assembly 70.

[0039] Specifically, first module assembly 20 and second module assembly 30 are interference fit into the module area formed by three constraint beams (first constraint beam 501, second constraint beam 503 and third constraint beam 508) in box assembly 50 by the end plate of both ends;That is, first module assembly 20 is installed in the space surrounded by first constraint beam 501, second constraint beam 503 and box frame 505, second module assembly 30 is installed in the space surrounded by second constraint beam 503, third constraint beam 508 and box frame 505, the design of above-mentioned constraint beam protects first module assembly 20 and second module assembly 30, prevents first module assembly 20 and second module assembly 30 from causing spontaneous combustion due to collision, improves the safety of battery pack, saves fastener simultaneously, improves the utilization of the internal space of box frame 505.

[0040] Further, first module assembly 20 and second module assembly 30 are interference fit into the module area formed by three constraint beams (first constraint beam 501, second constraint beam 503 and third constraint beam 508) in box, and first module assembly 20 and second module assembly 30 are connected in series between modules by a high-voltage copper bar (including high-voltage copper bar in copper bar assembly 70).

[0041] Reference Figure 2The angle steel 510 is arranged on the outer surface of the box frame 505 close to the bottom guard plate 60. Specifically, the angle steel 510 is arranged on the front and rear box frames 505 to protect the box frame 505, and the angle steel 510 is made of B340 high-strength steel to realize high-strength protection of the bottom of the battery pack (when the electric vehicle encounters a bottom scratch and impact in a harsh working condition during driving, the angle steel 510 can protect the battery pack).

[0042] Further, referring to Figure 2 , the outer surface of the box frame 505 is provided with a welded lug 504, a secondary positioning pin 506 and a main positioning pin 512. The secondary positioning pin 506 is installed between the adjacent two welded lugs 504 on the first outer surface (right surface) of the box frame 505, and the main positioning pin 512 is installed between the adjacent two welded lugs 504 on the second outer surface (left surface) of the box frame 505. The upper surface of the welded lug 504 is fixedly provided with a boss bushing 507.

[0043] Specifically, the welded lug 504 is formed by bending a cold-rolled structural steel, and is welded to the outer surface of the box frame 505. The upper surface of the welded lug 504 is provided with a hole for welding the boss bushing 507. The welded lug 504 is used to connect the box frame 505 and the boss bushing 507, and plays a connecting role. The secondary positioning pin 506 and the main positioning pin 512 are used for positioning during installation of the battery pack. The boss bushing 507 is used for connection between the battery pack and the vehicle.

[0044] Referring to Figure 4 , the copper bar assembly 70 includes a fast charging copper bar 74, and the fast charging copper bar 74 includes a first connecting head 71, a connecting rod 72 and a second connecting head 73 connected in sequence. The connecting rod 72 is installed on the upper surface of the first module assembly 20 and the second module assembly 30. The first connecting head 71 is electrically connected with the fast charging plug, and the second connecting head 73 is electrically connected with the first module assembly 20 and / or the second module assembly 30.

[0045] Specifically, the copper bar assembly 70 is made of T2 red copper, and the first connecting head 71 and the second connecting head 73 of the fast charging copper bar 74 are made of soft copper. The connecting rod 72 is made of hard aluminum and is lap-welded (for example, Figure 4The two As are both lap joints) and are formed; The fast charging copper bar 74 passes from above the first module assembly 20 and the second module assembly 30, greatly saving the internal space and improving the utilization rate of the internal space of the battery pack; The first connecting head 71 and the second connecting head 73 are made of soft copper, and the connecting rod 72 is made of hard aluminum, which reduces the production cost (the price is lower than that of the first connecting head 71, the connecting rod 72 and the second connecting head 73 made of copper); At the same time, compared with the way that the first connecting head 71, the connecting rod 72 and the second connecting head 73 are all made of aluminum, the space can be saved (because the first connecting head 71, the connecting rod 72 and the second connecting head 73 are all made of aluminum, the first connecting head 71 and the second connecting head 73 need to be made larger, because if they are made smaller, due to the large fast charging current and the large resistance of aluminum, the first connecting head 71 and the second connecting head 73 will generate serious heat during fast charging, and even fire, so the first connecting head 71 and the second connecting head 73 need to be made larger, which causes the internal space of the battery pack to need to be increased).

[0046] Further, the first connecting head 71 and the second connecting head 73 are made of copper, and the connecting rod 72 is made of aluminum; The first connecting head 71 and the second connecting head 73 are respectively lap welded with both ends of the connecting rod 72.

[0047] Specifically, lap welding is a process of connecting two or more overlapping parts together by welding, and the core is to form a permanent connection by locally melting the material in the overlapping area.

[0048] Reference Figure 3 The battery pack also includes a liquid cooling plate assembly 40, which is arranged between the box assembly 50 and the bottom guard plate 60. The upper surfaces of the liquid cooling plate assembly 40 are in contact with the lower surfaces of the first module assembly 20 and the second module assembly 30. The liquid cooling plate assembly 40 is used to cool the cells in the first module assembly 20 and the second module assembly 30.

[0049] Reference Figure 5 The liquid cooling plate assembly 40 includes a flat plate 41 and a flow channel plate 42, and the upper surface of the flow channel plate 42 is provided with a groove; The flat plate 41 is installed on the upper surface of the flow channel plate 42. Specifically, the flow channel is formed between the flat plate 41 and the groove of the flow channel plate 42, and the flow channel is respectively communicated with the water inlet and the water outlet on the box assembly 50 through the pipeline. The flat plate 41 and the flow channel plate 42 are welded together by brazing to form a liquid cooling plate assembly 40 with flow channels, and the liquid cooling plate assembly 40 fully covers one side of the cells in each module (the first module assembly 20 and the second module assembly 30). The liquid cooling plate assembly 40 is respectively communicated with the water inlet and the water outlet on the box assembly 50 through the pipeline, which greatly reduces the number of pipelines used, achieves the purpose of reducing cost and improving space utilization.

[0050] Specifically, the upper surface of the flat plate 41 is covered with a heat-conducting structural adhesive, which is used to bond the first module assembly 20 and the second module assembly 30, thereby improving the contact between the first module assembly 20, the second module assembly 30 and the flat plate 41, and further improving the heat conductivity. The bottom guard plate 60, the liquid cooling plate assembly 40 and the box frame 505 are connected by the bolts 511 (see Figure 3 ), thereby improving the strength of the entire battery pack.

[0051] Further, the liquid cooling plate assembly 40 and the bottom guard plate 60 are installed with the foam 80. The foam 80 plays a protective role (since the liquid cooling plate assembly 40 and the bottom guard plate 60 are both metal products, which are hard in texture, thereby preventing mutual scratching during installation).

[0052] Embodiment 2,

[0053] A trolley, comprising a vehicle body and the battery pack of embodiment 1, wherein the battery pack is installed in the vehicle body.

[0054] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A battery pack, characterized by, The battery pack comprises a box cover (10), a box assembly (50) and a bottom guard plate (60), the box cover (10) is mounted on the upper surface of the box assembly (50), and the bottom guard plate (60) is mounted on the lower surface of the box assembly (50); The box assembly (50) comprises a box frame (505), and the box frame (505) is internally provided with a first constraint beam (501), a second constraint beam (503) and a third constraint beam (508).

2. The battery pack of claim 1, wherein, The battery pack further comprises a first module assembly (20), a second module assembly (30) and a copper bar assembly (70); The first module assembly (20) is mounted in the space surrounded by the first constraint beam (501), the second constraint beam (503) and the box frame (505), and the second module assembly (30) is mounted in the space surrounded by the second constraint beam (503), the third constraint beam (508) and the box frame (505). The first module assembly (20) and the second module assembly (30) are electrically connected through the copper bar assembly (70).

3. The battery pack of claim 2, wherein, An angle steel (510) is arranged on the outer surface of the box frame (505) near the bottom guard plate (60).

4. The battery pack of claim 2, wherein, The outer surface of the box frame (505) is provided with a welding lug (504), a secondary positioning pin (506) and a primary positioning pin (512), the secondary positioning pin (506) is mounted between two adjacent welding lugs (504) on the first side surface of the box frame (505), and the primary positioning pin (512) is mounted between two adjacent welding lugs (504) on the second side surface of the box frame (505). A boss bushing (507) is fixedly mounted on the upper surface of the welding lug (504).

5. The battery pack of claim 2, wherein, The copper bar assembly (70) comprises a fast-charging copper bar (74), the fast-charging copper bar (74) comprises a first connecting head (71), a connecting rod (72) and a second connecting head (73) connected in sequence, the connecting rod (72) is mounted on the upper surfaces of the first module assembly (20) and the second module assembly (30), the first connecting head (71) is electrically connected with a fast-charging plug, and the second connecting head (73) is electrically connected with the first module assembly (20) and / or the second module assembly (30).

6. The battery pack of claim 5, wherein, The first connecting head (71) and the second connecting head (73) are made of copper, and the connecting rod (72) is made of aluminum; the first connecting head (71) and the second connecting head (73) are respectively lap-welded with both ends of the connecting rod (72).

7. The battery pack of claim 2, wherein, The battery pack further comprises a liquid cooling plate assembly (40), the liquid cooling plate assembly (40) is arranged between the box assembly (50) and the bottom guard plate (60), and the upper surfaces of the liquid cooling plate assembly (40) are in contact with the lower surfaces of the first module assembly (20) and the second module assembly (30).

8. The battery pack of claim 7, wherein, The liquid cooling plate assembly (40) comprises a flat plate (41) and a flow channel plate (42), the upper surface of the flow channel plate (42) is provided with a groove, and the flat plate (41) is mounted on the upper surface of the flow channel plate (42).

9. The battery pack of any of claims 7-8, wherein, A foam (80) is mounted between the liquid cooling plate assembly (40) and the bottom guard plate (60).

10. An electric vehicle, characterized by The battery pack according to any one of claims 1 to 9 is installed in the vehicle body.

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