Battery pack and electric vehicle

Abstract

The utility model relates to the technical field of battery packs, and discloses a battery pack and an electric vehicle, and the battery pack comprises a box body, a battery module and a buffer protection piece, and the buffer protection piece is arranged between the end part of the battery module and the side wall of the box body. According to the battery pack with the structure, the buffer protection part is arranged between at least one of the two opposite ends of the battery module and the side wall of the box body, the side edge, where the buffer protection part is located, of the box body is suitable for being arranged on the side edge of a vehicle, and when the vehicle laterally collides with the column, the vehicle collides with the box body; the box body is extruded and further extrudes and impacts the buffer protection part in the box body, the buffer protection part is protected outside the end face of the battery module, and the buffer protection part is deformed or broken due to impact to absorb energy generated in the impact process, so that the battery module in the buffer protection part is protected, the battery is prevented from being extruded and damaged, and the integrity of the battery can be effectively ensured; and the safety performance of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and particularly relates to a battery pack and an electric vehicle. Background Art

[0002] With the development of new energy vehicles, the safety performance requirements for battery packs are also getting higher and higher. The battery pack includes structures such as a box body and battery modules, and the battery modules are arranged inside the box body. When the vehicle side-collides with a pillar, the box body is impacted and deformed by extrusion, and further squeezes the battery modules inside the box body, and the batteries are damaged by extrusion, which is likely to cause safety problems. Summary of the Utility Model

[0003] In view of this, the utility model provides a battery pack and an electric vehicle to solve the problem that the battery in the existing battery pack is easily damaged by extrusion when the vehicle side-collides with a pillar.

[0004] In a first aspect, the utility model provides a battery pack, including:

[0005] A box body;

[0006] Battery modules, arranged inside the box body, and at least one of the two relatively arranged ends of the battery modules is spaced from the side wall of the box body;

[0007] A buffer protection member, arranged between the end of the battery module and the side wall of the box body; the side of the box body where the buffer protection member is located is suitable for being arranged on the side of the vehicle. When the vehicle side-collides with a pillar, the buffer protection member absorbs energy to protect the battery modules inside it.

[0008] Beneficial Effects: For the battery pack with this structure, a buffer protection member is arranged between at least one of the two relatively arranged ends of the battery module and the side wall of the box body. The side of the box body where the buffer protection member is located is suitable for being arranged on the side of the vehicle. When the vehicle side-collides with a pillar, the vehicle impacts the box body, the box body is extruded and then squeezes and impacts the buffer protection member inside the box body. The buffer protection member protects outside the end face of the battery module. The buffer protection member is deformed or broken by the impact to absorb the energy generated during the impact, so as to protect the battery modules inside it, prevent the battery from being damaged by extrusion, and can effectively ensure the integrity of the battery and improve the safety performance of the battery pack.

[0009] In an optional embodiment, the buffer protection member includes a lateral part and a bending part. The lateral part extends vertically, the bending part extends horizontally, the bending part is vertically arranged at the top or bottom of the lateral part, the bending part is connected to the top surface or bottom surface of the battery module, and the lateral part is arranged outside the end face of the battery module.

[0010] Beneficial effects: The lateral part is arranged outside the end face of the battery module to protect the battery module from the end. The bending part fixedly connects the buffer protection component to the battery module, and the bending part can also protect a partial area of the battery module at its top or bottom.

[0011] In an alternative embodiment, the bending parts are provided at both the top and bottom of the lateral part. The bending part at the top of the lateral part is connected to the top surface of the battery module, and the bending part at the bottom of the lateral part is connected to the bottom surface of the battery module.

[0012] In an alternative embodiment, a strengthening part is further provided on the lateral part between the upper and lower bending parts, and the strengthening part extends horizontally in the same direction as the bending part.

[0013] Beneficial effects: The strengthening part is arranged between the two bending parts to strengthen the strength of the buffer protection part. The strengthening part abuts outside the end face of the battery module to space the lateral part apart from the end face of the battery module, and can improve the buffer energy absorption effect of the lateral part when being impacted.

[0014] In an alternative embodiment, the buffer protection component includes a lateral part which extends vertically. The lateral part is arranged outside the end face of the battery module and is connected to the end face of the battery module.

[0015] In an alternative embodiment, a cavity structure is provided inside the lateral part.

[0016] Beneficial effects: A cavity structure is provided inside the lateral part. When being impacted, the cavity structure can play a good role in energy absorption to improve the protection effect of the buffer protection part on the battery module.

[0017] In an alternative embodiment, the material of the buffer protection part includes high-density foam, polypropylene, microcellular foamed polypropylene or energy-absorbing composite material.

[0018] Beneficial effects: The material of the buffer protection part has low strength itself. When being impacted, the buffer protection part can be broken or deformed, thereby absorbing the impact energy to protect the battery module.

[0019] In an alternative embodiment, it further includes a liquid cooling plate which is arranged inside the box body, at the bottom of the battery module. A strengthening member is provided at the side of the bottom of the liquid cooling plate and / or in the middle area of the bottom of the liquid cooling plate.

[0020] Beneficial effects: Providing a strengthening member at the bottom of the liquid cooling plate can increase the stiffness of the liquid cooling plate, thereby improving the overall stiffness of the battery pack.

[0021] In an alternative embodiment, the reinforcing member includes a top connecting surface and a bottom buffer surface. The top connecting surface is connected to the bottom surface of the liquid cooling plate, and the bottom buffer surface is recessed below the top connecting surface so that the bottom buffer surface is spaced apart from the bottom surface of the liquid cooling plate.

[0022] Advantageous effects: The bottom buffer surface is spaced apart from the bottom surface of the liquid cooling plate, so that the reinforcing member plays a buffering role at the bottom of the liquid cooling plate, and the bending resistance stiffness of the reinforcing member in the vertical direction is improved.

[0023] In a second aspect, the present invention further provides an electric vehicle, including the battery pack described in any one of the above. The side of the box body where the buffer protection member is located is arranged on the side of the electric vehicle. The battery vehicle includes a battery pack and has the same technical effects as the battery pack, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are 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 efforts.

[0025] Figure 1 An exploded view of a battery pack according to an embodiment of the present invention;

[0026] Figure 2 An exploded view of a battery module, a buffer protection member, a box body, and a bottom protection plate in a battery pack according to an embodiment of the present invention;

[0027] Figure 3 A top view of the cooperation between a battery module and a buffer protection member in a battery pack according to an embodiment of the present invention;

[0028] Figure 4 For Figure 3 A sectional view taken along the line A-A;

[0029] Figure 5 A schematic diagram of a second buffer protection member in a battery pack according to an embodiment of the present invention;

[0030] Figure 6 A schematic diagram of a third buffer protection member in a battery pack according to an embodiment of the present invention;

[0031] Figure 7 A schematic diagram of a fourth buffer protection member in a battery pack according to an embodiment of the present invention;

[0032] Figure 8Schematic diagram of the fifth buffer protection component in a battery pack according to an embodiment of the present invention;

[0033] Figure 9 is Figure 8 Partial enlarged view of part A in;

[0034] Figure 10 is Figure 1 Top view of the liquid cooling plate in;

[0035] Figure 11 Explosion diagram of the liquid cooling plate and the strengthening member.

[0036] Explanation of reference numerals:

[0037] 1, box body; 2, battery module; 3, buffer protection component; 31, lateral part; 311, cavity structure; 32, bending part; 33, strengthening part; 4, liquid cooling plate; 5, strengthening member; 51, side strengthening member; 52, middle strengthening member; 6, upper cover; 7, pressing plate; 8, bottom protection plate; 9, cross beam. Specific embodiments

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0039] Next, in combination with Figures 1 to 11 , the embodiments of the present invention will be described.

[0040] According to an embodiment of the present invention, on the one hand, a battery pack is provided, including a box body 1, a battery module 2, and a buffer protection component 3. Among them, the battery module 2 is arranged in the box body 1, and at least one of the two relatively arranged ends of the battery module 2 is spaced from the side wall of the box body 1; the buffer protection component 3 is arranged between the end of the battery module 2 and the side wall of the box body 1; the side of the box body 1 where the buffer protection component 3 is located is adapted to be arranged on the side of the vehicle. When the vehicle side collision column hits, the buffer protection component 3 absorbs energy to protect the battery module 2 inside it.

[0041] For the battery pack with this structure, a buffer protection member 3 is provided between at least one of the two relatively arranged ends of the battery module 2 and the side wall of the box body 1. The side of the box body 1 where the buffer protection member 3 is located is adapted to be arranged on the side of the vehicle. When the vehicle side-collides with a pillar, the vehicle impacts the box body 1, and the box body 1 is squeezed and then squeezes and impacts the buffer protection member 3 inside the box body 1. The buffer protection member is located outside the end face of the battery module 2. The buffer protection member is deformed or broken by the impact to absorb the energy generated during the impact, so as to protect the battery module 2 inside it, prevent the battery from being damaged by extrusion, effectively ensure the integrity of the battery, and improve the safety performance of the battery pack.

[0042] As Figure 1 shown, the left-right direction is the width direction of the battery pack and the battery module 2, and the front-back direction is the length direction of the battery module 2.

[0043] Optionally, in some embodiments, as Figures 1 to 8 shown, buffer protection members 3 are provided between the end faces at both ends in the width direction of the battery module 2 and the side of the box body 1. When the vehicle side-collides with a pillar, both ends in the width direction of the battery module 2 have the energy absorption and protection effect of the buffer protection members 3, which can effectively reduce the damage to the battery module 2 and the battery during the vehicle side-collision with a pillar, thereby effectively improving the safety performance of the battery pack.

[0044] Optionally, in some embodiments, the buffer protection member 3 is connected to the battery module 2, and the buffer protection member 3 remains relatively fixed to the battery module 2 to prevent the buffer protection member 3 from moving relative to the battery module 2, so as to better protect the battery module 2 when being impacted.

[0045] As Figures 1 to 4 shown, in some embodiments, the buffer protection member 3 includes a lateral part 31 and a bending part 32. The lateral part 31 extends vertically, and the bending part 32 extends horizontally. The bending part 32 is vertically arranged at the top or bottom of the lateral part 31. The bending part 32 is connected to the top or bottom surface of the battery module 2, and the lateral part 31 is arranged outside the end face of the battery module 2. The lateral part 31 is arranged outside the end face of the battery module 2 to protect the battery module 2 from the end. The bending part 32 fixedly connects the buffer protection member to the battery module 2, and the bending part 32 can also protect a partial area of the battery module 2 at its top or bottom.

[0046] Optionally, in some embodiments, as Figures 1 to 4 shown, the bending part 32 is arranged at the top of the lateral part 31, and the bending part 32 is connected to the top surface of the battery module 2. For example, optionally, the bending part 32 is adhesively fixed to the battery module 2.

[0047] Optionally, the battery module 2 includes blade batteries. The long sides of the blade batteries extend along the width direction of the battery pack. Covers are provided at both ends in the length direction of the blade batteries, and pole columns are provided on the covers. Structures such as busbars and flexible circuit boards are provided at the ends in the length direction of the battery module 2. The lateral part 31 is arranged outside the end face of the battery module 2, which can protect key structures such as busbars and flexible circuit boards while preventing the battery module 2 and the battery from being squeezed and damaged. The cover is welded to the housing of the blade battery, and the strength of the welding area is weak. The bending part 32 covers the top surface of the battery module 2, that is, the bending part 32 covers the top surface of the blade battery, which can play a role in protecting and strengthening the welding area between the cover and the housing.

[0048] As Figure 5 shown, in other embodiments, bending parts 32 are provided at both the top and bottom of the lateral part 31. The bending part 32 at the top of the lateral part 31 is connected to the top surface of the battery module 2, and the bending part 32 at the bottom of the lateral part 31 is connected to the bottom surface of the battery module 2. The upper and lower bending parts 32 can protect the top and bottom of the battery module 2 at the same time, playing a role in strengthening the overall strength of the battery module 2.

[0049] As Figure 6 shown, in some embodiments, a reinforcing part 33 is further provided on the lateral part 31 between the upper and lower bending parts 32. The reinforcing part 33 extends horizontally in the same direction as the bending part 32. The reinforcing part 33 is arranged between the two bending parts 32, playing a role in strengthening the strength of the buffer protection part 3. The reinforcing part 33 abuts against the outside of the end face of the battery module 2, so that the lateral part 31 is spaced apart from the end face of the battery module 2. When being impacted, the buffer energy absorption effect of the lateral part 31 can be improved. The setting position of the reinforcing part 33 is located in the non-sampling FPC area.

[0050] In this embodiment, the reinforcing part 33 extends horizontally away from the lateral part 31, and the width of its horizontal extension away from the lateral part 31 is smaller than the width of the horizontal extension of the bending part 32 away from the lateral part 31, so as to reserve a part of space in the width direction of the bending part 32. This reserved space can extend into the top surface or the top surface of the battery module 2 inward, facilitating the connection of the bending part 32 to the battery module 2 through the reserved space.

[0051] In other embodiments, as Figure 7 shown, the buffer protection part 3 includes a lateral part 31. The lateral part 31 extends vertically. The lateral part 31 is arranged outside the end face of the battery module 2, and the lateral part 31 is connected to the end face of the battery module 2. The buffer protection part 3 is directly connected to the end face of the battery module 2 through the lateral part 31, so as to effectively protect the battery module 2 from the end face of the battery module 2. The structure of the buffer protection part 3 is simple and efficient.

[0052] In this embodiment, structures such as busbars and flexible circuit boards are provided at the ends of the battery module 2 in the length direction. A plastic protection sheet is provided outside the busbars and flexible circuit boards, and the lateral part 31 is adhesively fixed to the plastic protection sheet.

[0053] As Figure 8 and Figure 9 shown, in some embodiments, a cavity structure 311 is provided inside the lateral part 31. When impacted, the cavity structure 311 can play a good energy absorption role to improve the protection effect of the buffer protection member 3 on the battery module 2.

[0054] As Figure 8 and Figure 9 shown, the longitudinal section of the lateral part 31 can be in a square shape or a cross shape to form one or more cavity structures 311 inside the lateral part 31.

[0055] Optionally, in some embodiments, the material of the buffer protection member 3 includes high-density foam, polypropylene, microcellular foamed polypropylene, or energy-absorbing composite material. The material of the buffer protection member 3 itself has low strength and can be broken or deformed when impacted, thereby absorbing the impact energy to protect the battery module 2.

[0056] In some embodiments, the explosion-proof valves of the blade battery are provided on the cover plates at both ends of its housing. The lateral part 31 also protects the explosion-proof valves. The material of the buffer protection member 3 includes high-density foam, polypropylene, microcellular foamed polypropylene, or energy-absorbing composite material. The material of the buffer protection member 3 itself has low strength and can be normally broken through the lateral part 31 when the internal pressure of the battery increases abnormally and releases pressure, thereby ensuring normal pressure release of the battery.

[0057] In other embodiments, the explosion-proof valve can also be provided at the bottom of the housing of the blade battery.

[0058] As Figure 1 and Figure 2 shown, the battery pack further includes a liquid cooling plate 4. The liquid cooling plate 4 is provided inside the box body 1. The liquid cooling plate 4 is provided at the bottom of the battery module 2. Reinforcing members 5 are provided on the side edges and / or the middle region of the bottom of the liquid cooling plate 4. By providing the reinforcing members 5 at the bottom of the liquid cooling plate 4, the stiffness of the liquid cooling plate 4 can be increased, thereby improving the overall stiffness of the battery pack.

[0059] The reinforcing member 5 includes a side reinforcing member 51 and a middle reinforcing member 52. As Figure 1 , Figure 2 and Figure 11 shown, side reinforcing members 51 are provided at both ends of the liquid cooling plate 4 extending along the width direction of the box body 1, and the middle reinforcing member 52 is provided in the middle region of the liquid cooling plate 4. Optionally, both the side reinforcing member 51 and the middle reinforcing member 52 are adhesively fixed to the bottom surface of the liquid cooling plate 4.

[0060] Optionally, the middle reinforcing member 52 can be integrally provided or separately provided.

[0061] In some embodiments, the reinforcing member 5 includes a top connecting surface and a bottom buffer surface. The top connecting surface is connected to the bottom surface of the liquid cooling plate 4, and the bottom buffer surface is concave with respect to the top connecting surface, so that the bottom buffer surface is spaced from the bottom surface of the liquid cooling plate 4, thereby enabling the reinforcing member 5 to play a buffering role at the bottom of the liquid cooling plate 4 and improving the bending resistance stiffness of the reinforcing member 5 in the vertical direction.

[0062] Optionally, in some embodiments, as Figure 11 shown, the cross-section of the reinforcing member 5 along the height direction of the box body 1 is wavy, which can improve the bending resistance stiffness of the reinforcing member 5 in the vertical direction.

[0063] As Figure 1 and Figure 2 shown, the battery pack further includes an upper cover 6, a pressing plate 7, a bottom guard plate 8, and a cross beam 9. The upper cover 6 is fixed to the top of the box body 1, the pressing plate 7 is arranged on the top of the battery module 2, the bottom guard plate 8 is arranged at the bottom of the box body 1 to protect the box body 1. The cross beam 9 is arranged inside the box body 1, which can further increase the overall stiffness of the battery pack.

[0064] According to an embodiment of the present invention, on the other hand, an electric vehicle is further provided, including the above-mentioned battery pack, and the side of the box body 1 where the buffer protection member 3 is located is arranged on the side of the electric vehicle.

[0065] For an electric vehicle with this structure, when the vehicle side impacts a pillar, the vehicle impacts the box body 1, the box body 1 is squeezed and then squeezes and impacts the buffer protection member 3 inside the box body 1. The buffer protection member protects outside the end face of the battery module 2. The buffer protection member is deformed or broken by the impact to absorb the energy generated during the impact, so as to protect the battery module 2 inside it, prevent the battery from being damaged by extrusion, and can effectively ensure the integrity of the battery, improving the safety performance of the battery pack and the electric vehicle.

[0066] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that: include: Box; A battery module is disposed in the box, and at least one of two oppositely disposed ends of the battery module is spaced apart from a side wall of the box; A buffer protection member is arranged between the end of the battery module and the side wall of the box body; the side of the box body where the buffer protection member is located is suitable for being arranged on the side of the vehicle. When the vehicle hits a column from the side, the buffer protection member absorbs energy to protect the battery module inside it.

2. The battery pack according to claim 1, characterized in that: The buffer protection member includes a lateral portion and a bending portion, wherein the lateral portion extends vertically, the bending portion extends horizontally, the bending portion is vertically arranged at the top or bottom of the lateral portion, the bending portion is connected to the top surface or bottom surface of the battery module, and the lateral portion is arranged outside the end surface of the battery module.

3. The battery pack according to claim 2, characterized in that: The bending portion is provided at the top and bottom of the lateral portion. The bending portion at the top of the lateral portion is connected to the top surface of the battery module, and the bending portion at the bottom of the lateral portion is connected to the bottom surface of the battery module.

4. The battery pack according to claim 3, characterized in that: A reinforcement portion is further provided on the lateral portion between the upper and lower bending portions, and the reinforcement portion and the bending portion extend horizontally in the same direction.

5. The battery pack according to claim 1, characterized in that: The buffer protection member includes a lateral portion, the lateral portion extends vertically, the lateral portion is arranged outside the end surface of the battery module, and the lateral portion is connected to the end surface of the battery module.

6. The battery pack according to claim 5, characterized in that: A cavity structure is provided inside the lateral portion.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The material of the buffer protection component includes high-density foam, polypropylene, microporous foamed polypropylene or energy-absorbing composite material.

8. The battery pack according to any one of claims 1 to 6, characterized in that: It also includes a liquid cooling plate, which is arranged in the box body and at the bottom of the battery module. Reinforcements are provided on the side edges of the bottom of the liquid cooling plate and / or in the middle area of ​​the bottom of the liquid cooling plate.

9. The battery pack according to claim 8, characterized in that: The reinforcement member includes a top connecting surface and a bottom buffer surface, the top connecting surface is connected to the bottom surface of the liquid cooling plate, and the bottom buffer surface is recessed from the top connecting surface so that the bottom buffer surface is spaced apart from the bottom surface of the liquid cooling plate.

10. An electric vehicle, characterized in that: A battery pack comprising any one of claims 1 to 9, wherein the side of the box body where the buffer protection member is located is arranged on the side of the electric vehicle.

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