Power battery pack and vehicle

Abstract

The invention provides a power battery pack and a vehicle. The power battery pack comprises a box body and a plurality of battery modules contained in the box body, the box body comprises a shell and a top cover attached to the shell, the shell comprises a plurality of side beams and a bottom plate, and cooling parts are arranged between the battery modules and the top cover and / or the bottom plate. The cooling piece is a one-piece cooling plate and comprises a plurality of cooling parts corresponding to the battery modules respectively, and the cooling piece is also provided with a plurality of avoiding holes corresponding to the structural pieces in the shell. The one-piece cooling plate is arranged in the battery pack, so that uniform heat dissipation of all the battery modules is ensured, the temperature gradient in the power battery pack is reduced, the design of the cooling piece is simplified, the manufacturing cost is reduced, a plurality of connecting pipelines do not need to be arranged in the cooling piece, and the structure of the cooling piece is simplified. Besides, the avoiding hole corresponding to the structural member in the shell is formed in the cooling member, so that the cooling member is prevented from interfering with other components, and the space integration level in the battery pack is improved.

Description

Technical Field

[0001] This invention relates to the field of vehicles, and more particularly to the field of vehicle power battery systems. More specifically, it relates to a power battery pack and a vehicle using the power battery pack. Background Technology

[0002] With the increasing popularity of new energy vehicles, higher and higher requirements are being placed on battery pack technology, a key technology in these vehicles. During charging and discharging, the battery modules in a power battery pack generate a large amount of heat. If this heat is not cooled effectively and promptly, it will not only affect the performance of the power battery pack but may also cause thermal runaway and even lead to safety accidents.

[0003] Currently, the cooling system in power battery packs typically uses multiple cooling plates and cooling pipes connecting these plates. While this design achieves some degree of temperature control for the battery, it makes the entire cooling system more complex. This not only increases the weight of the power battery pack and affects its safety, but also occupies more space in the vehicle's cabin, thus affecting the vehicle's energy density and range, and reducing overall vehicle safety. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art and provide a power battery pack that improves the safety of the power battery pack in a cost-effective and reliable manner.

[0005] Therefore, according to one aspect of the present invention, a power battery pack is provided, the power battery pack including a housing and a plurality of battery modules housed in the housing, the housing including a shell and a top cover attached to the shell, the shell including a plurality of side beams and a bottom plate, wherein a cooling element is provided between the plurality of battery modules and the top cover and / or the bottom plate, the cooling element being constructed as a one-piece cooling plate and including a plurality of cooling portions corresponding to each of the battery modules, and the cooling element also having a plurality of clearance holes corresponding to structural members within the shell.

[0006] Based on the above-described technical concept, the present invention may further include any one or more of the following optional forms.

[0007] In some alternative configurations, the cooling element is disposed between the plurality of battery modules and the base plate, and a support member is provided between the cooling element and the base plate to support the cooling element, the support member creating a predetermined gap between the cooling element and the base plate.

[0008] In some alternative forms, the base plate is provided with a plurality of shock-absorbing portions spaced apart from each other, each of the shock-absorbing portions being recessed from the base plate toward the interior of the housing.

[0009] In some alternative forms, each of the damping components has at least one of a hemispherical structure, a polygonal structure, or a conical structure.

[0010] In some alternative forms, the housing is provided with a support beam, and the multiple battery modules and the support beam are fixed to the base plate by a fastening structure. The cooling component is provided with at least a multiple clearance holes corresponding to the fastening structure.

[0011] In some alternative forms, the plurality of side beams includes two first side beams extending along a first direction, and two second side beams located between the two first side beams and extending along a second direction at an angle to the first direction. The support beam extends along the first direction and / or the second direction. Each first side beam has a first energy-absorbing portion extending along the first direction, each second side beam has a second energy-absorbing portion extending along the second direction, and the support beam has a third energy-absorbing portion extending along the first direction and / or the second direction. The first energy-absorbing portion, the second energy-absorbing portion, and the third energy-absorbing portion are configured to transmit impact forces along the first direction and / or the second direction.

[0012] In some alternative forms, the plurality of battery modules include a first group of battery modules and a second group of battery modules arranged side by side along the first direction or the second direction, wherein a first protective member for thermal runaway protection is provided between the first group of battery modules and the second group of battery modules, and the first protective member includes two sides respectively overlapping the first group of battery modules and the second group of battery modules.

[0013] In some alternative forms, the first protective member has fasteners on its two sides for the top cover to press against, thereby securing the first protective member.

[0014] In some alternative forms, the top cover has a second protective element for thermal runaway protection on the side facing the plurality of battery modules, and an exhaust channel is formed between the first protective element and the second protective element.

[0015] In some alternative forms, the first protective element and / or the second protective element are made of mica and / or aerogel.

[0016] In some alternative configurations, each battery module in the first group of battery modules and the second group of battery modules is provided with a cell controller, which is arranged between the first group of battery modules and the second group of battery modules.

[0017] In some alternative forms, each of the first group of battery modules and the second group of battery modules has a slot on its exterior, and the cell controller has a snap-fit ​​part that matches the slot to attach the cell controller to the battery module.

[0018] In some alternative forms, each of the battery modules has an end plate arranged on its exterior, the end plate having a recess for accommodating the cell controller, the recess being generally U-shaped and including a sidewall with the slot.

[0019] In some alternative configurations, multiple first busbars are provided between each battery module in the first group of battery modules and between each battery module in the second group of battery modules, with each first busbar arranged between the first group of battery modules and the second group of battery modules along one of the first direction and the second direction.

[0020] In some alternative forms, a second busbar is provided between at least one battery module in the first group of battery modules and at least one battery module in the second group of battery modules, the second busbar being arranged between the first group of battery modules and the second group of battery modules along the other of the first direction and the second direction.

[0021] In some alternative configurations, the top cover has a plurality of retainers on the side opposite to the battery module, each of the retainers being configured to absorb the impact force during thermal runaway of the power battery pack in order to maintain the strength of the top cover.

[0022] According to another aspect of the present invention, a vehicle is provided, the vehicle including the aforementioned power battery pack.

[0023] This invention, by incorporating a one-piece cooling plate within the battery pack, ensures uniform heat dissipation for all battery modules, reduces temperature gradients within the power battery pack, and improves its performance and lifespan. Furthermore, the one-piece cooling plate simplifies the design of cooling components and reduces manufacturing costs. Additionally, by using a one-piece cooling plate, only two cooling pipes for coolant inlet and outlet are needed, eliminating the need for multiple connecting pipes within the cooling component, thus simplifying its structure. Moreover, the cooling component features corresponding clearance holes for structural components within the housing, preventing interference between the cooling component and other parts and improving the spatial integration within the battery pack. Attached Figure Description

[0024] Other features and advantages of the invention will be better understood through the following detailed description of alternative embodiments in conjunction with the accompanying drawings, in which the same reference numerals identify the same or similar parts, wherein:

[0025] Figure 1 This is a schematic diagram of a power battery pack according to one embodiment of the present invention;

[0026] Figure 2 yes Figure 1 A diagram showing the removal of the top cover from the power battery pack;

[0027] Figure 3 yes Figure 1 A schematic diagram of the power battery pack housing;

[0028] Figure 4 This is a schematic diagram of a cooling component for a power battery pack according to one embodiment of the present invention;

[0029] Figure 5 yes Figure 1 A cross-sectional schematic diagram of the power battery pack;

[0030] Figure 6 yes Figure 1 A cross-sectional view of the power battery pack with the top cover removed;

[0031] Figure 7 yes Figure 3 Exploded view of the power battery pack casing;

[0032] Figure 8 yes Figure 6 Enlarged view of part A;

[0033] Figure 9 yes Figure 2 Enlarged view of part B;

[0034] Figure 10 This is a schematic diagram of the end plate and cell controller of a battery module according to one embodiment of the present invention;

[0035] Figure 11 yes Figure 1 A top view of the power battery pack with the top cover and first protective component removed;

[0036] Figure 12 This is a schematic diagram of the busbar of a power battery pack according to one embodiment of the present invention;

[0037] Figure 13 This is a schematic diagram of a wiring harness within a power battery pack according to an embodiment of the present invention; and

[0038] Figure 14 yes Figure 1 Side view of the power battery pack. Detailed Implementation

[0039] The implementation and use of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed are merely illustrative of particular ways of implementing and using the invention, and are not intended to limit the scope of the invention. In the description, the structural positions of the various components, such as upper, lower, top, bottom, etc., are not absolute but relative. These directional descriptions are appropriate when the various components are arranged as shown in the figures, but they change accordingly when the positions of the various components in the figures change.

[0040] In this document, unless otherwise explicitly stated and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this document according to the specific circumstances.

[0041] In this article, "horizontal" refers to the direction with a relatively small size, also known as the width direction; "vertical" refers to the direction with a relatively large size, also known as the length direction; and "vertical" refers to the direction that is roughly perpendicular to the ground.

[0042] In this article, "vehicle" refers to a new energy vehicle that uses a power battery pack as its operating power and / or driving power, including but not limited to pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles.

[0043] Typically, vehicle battery packs include battery modules, battery pack housings, and battery management modules. Among these, the cooling system is crucial for battery pack safety. The inventors discovered that current cooling systems usually employ a method of placing cooling plates for each battery module and connecting these plates via cooling pipes. This design suffers from low heat transfer efficiency due to the limited contact area between the cooling plates and the individual battery cells, and the long flow path of the coolant. This results in ineffective cooling of the batteries and, in the event of coolant leakage, the coolant may leak into the battery modules, causing short circuits or corrosion within the battery pack and compromising its safety.

[0044] Combination Figures 1 to 3 As shown, a power battery pack according to one embodiment of the present invention includes a battery pack housing 100, which includes a shell and a top cover 130 attached to the shell. A plurality of battery modules 200 can be arranged side-by-side within the shell, for example, along the width and / or length directions of the battery modules 200, and sealed by the top cover 130. Figure 2In the diagram, the width direction of the battery module 200 is identified by the first direction D1, and the length direction of the battery module 200 is identified by the second direction D2. Figure 2 An exemplary illustration shows eight battery modules 200 housed within a housing. Specifically, four of the eight battery modules 200 are arranged side-by-side along a first direction D1 within the housing to form a first group of battery modules 210. The other four battery modules are also arranged side-by-side along the first direction D1 within the housing to form a second group of battery modules 220. The first group of battery modules 210 and the second group of battery modules 220 are arranged within the housing along a second direction D2. It is understood that the number and distribution of the battery modules 200 may vary depending on different needs and are not limited to those shown in the figure.

[0045] Reference Figure 3 and Figure 7 The housing includes a base plate 170 and a plurality of side beams sealingly connected to the base plate 170. The side beams include two first side beams 110 extending along a first direction D1, and two second side beams 120 located between the two first side beams 110 and extending along a second direction D2 at an angle to the first direction D1. Specifically, the first direction D1 is perpendicular to the second direction D2. In the illustrated layout, the first direction D1 can be considered as being along the transverse direction of the housing, and the second direction D2 can be considered as being along the longitudinal direction of the housing. The housing also includes support beams 140 to provide structural support. Figure 3 In the housing, the casing includes a support beam 140 extending along a second direction D2, which is fixed to the base plate 170 of the battery pack housing 100 by a fastening structure (not shown). It is understood that the number and distribution of the support beams 140 vary depending on different needs and are not limited to those shown in the figures; for example, the housing may also include multiple support beams extending along a first direction D1. Figure 7 In the battery pack housing 100, a fixed beam 180 extending along the first direction D1 is provided on the bottom plate 170. The fixed beam 180 is provided with a fastening structure 181. The battery module 200 can be fixed to the fixed beam 180 of the bottom plate 170 of the battery pack housing 100 through the fastening structure 181.

[0046] In addition, at least one end of the battery module 200 is provided with a cooling element 150, that is, a cooling element 150 is provided between the battery module 200 and the top cover 130 and / or the bottom plate 170. The cooling element 150 includes a first cooling element 151 and / or a second cooling element (not shown), the first cooling element 151 is provided between the battery module 200 and the bottom plate 170, and the second cooling element is provided between the battery module 200 and the top cover 130. Figure 4 A first cooling element 151 is shown; it is understood that a second cooling element may employ a similar structure to the first cooling element 151. Figures 4 to 6As shown, the first cooling element 151 and the second cooling element are constructed as a one-piece cooling plate to ensure that all battery modules 200 can dissipate heat evenly, reduce the temperature gradient within the power battery pack, and improve the performance and lifespan of the power battery pack. Figure 4 In this embodiment, the first cooling component 151 is specifically constructed as a one-piece cooling plate 152. The cooling plate 152 has cooling sections corresponding to each battery module 200, allowing coolant to flow within each cooling section instead of throughout the entire cooling plate, thus accelerating cooling and saving coolant usage. A thermally conductive pad 153 may be provided on the cooling section to maintain a stable temperature within the power battery pack. The cooling plate 152 is provided with cooling pipes 154 including inlets and outlets. For the example battery module 200 comprising a first group of battery modules 210 and a second group of battery modules 220, the inlet and outlet of the cooling pipes 154 may be respectively arranged at one end of the first group of battery modules 210 and the opposite end of the second group of battery modules 220, thereby achieving comprehensive cooling of the battery module 200. The cooling pipes 154 are respectively connected to two of the multiple side beams. Specifically, the cooling pipes 154 are connected to cooling flanges 155, such as... Figure 2 As shown, the cooling flange 155 is attached to the second side beam 120 to allow coolant to enter and exit the cooling plate 152. Thus, only two cooling pipes 154 for coolant entry and exit are needed, eliminating the need for multiple connecting pipes within the cooling component 150, simplifying its structure. Additionally, the first cooling component 151 has multiple clearance holes 156, which correspond to structural components within the housing. For example, the clearance holes 156 can correspond to the fastening structures of the battery module 200 and the support beam 140 to allow for clearance, preventing interference between the first cooling component 151 and other components and improving the spatial integration within the battery pack.

[0047] exist Figure 5 and Figure 6In this embodiment, a support member 160 is provided between the first cooling component 151 and the base plate 170 to support the first cooling component 151. This support member 160 allows a predetermined gap d to be formed between the first cooling component 151 and the base plate 170. It is understood that this predetermined gap d is set according to different requirements and is not limited here. In this embodiment, the support member 160 is constructed as a support plate. In some embodiments, the support plate 160 can be made of, for example, a foamed material, such as polyethylene foam or polypropylene foam. Foamed materials have low density and light weight, which helps to reduce the overall weight of the power battery pack. Furthermore, foamed materials also have good thermal insulation properties, which can help maintain the temperature stability of the battery module 200 and improve the safety of the power battery pack. This reduces the risk of deformation or coolant leakage of the first cooling component 151 due to pressure from, for example, the battery module 200. Furthermore, the support component 160 creates a certain gap between the first cooling component 151 and the base plate 170, allowing the coolant to flow to the bottom of the housing in the event of a coolant leak, thereby reducing the contact between the leaked coolant and the battery module 200 and lowering the risk of short circuits or corrosion within the power battery pack.

[0048] Reference Figure 7 In some embodiments, the base plate 170 may be provided with a plurality of damping portions 171 spaced apart from each other, each damping portion 171 being recessed from the base plate 170 toward the interior of the housing. Advantageously, each damping portion 171 may have, for example, a hemispherical structure. Thus, when the vehicle is under high load and the bottom of the power battery pack is impacted, for example by a stone, the damping portion 171 can form a buffer zone, protecting the battery module 200 and the first cooling member 151 from direct impact, thereby maintaining the cooling function within the power battery pack and reducing mechanical damage and short-circuit risk to the battery module 200. In addition, the smooth curved surface of the hemispherical structure can evenly distribute the impact force across the entire surface of the base plate 170, avoiding stress concentration and reducing localized damage to the base plate 170 caused by the impact force. It is understood that the shape of the damping portion 171 is not limited to this, and may be, for example, a polygonal structure, a conical structure, etc.

[0049] Combination Figure 5 , Figure 6 and Figure 8As shown, a first protective member 310 is provided between the first battery module 210 and the second battery module 220, with two sides of the first protective member 310 overlapping the surfaces of the first battery module 210 and the second battery module 220. A second protective member 320 is provided on the side of the top cover 130 facing the battery module 200, and an exhaust channel is formed between the first protective member 310 and the second protective member 320. In some embodiments, the second protective member 320 may be attached to the top cover 130, for example, by adhesive, which is not limited here. In addition, the first protective member 310 and / or the second protective member 320 are made of mica and / or aerogel. Thus, when the battery module 200 experiences thermal runaway due to overheating, the first protective component 310 can prevent a short circuit caused by the interaction between the first battery module 210 and the second battery module 220. The second protective component 320 can prevent the top cover 130 from overheating and affecting the overall vehicle performance. Furthermore, the high-temperature and high-pressure gas generated by thermal runaway can be discharged from the power battery pack through the exhaust channel formed between the first protective component 310 and the second protective component 320. Specifically, in this embodiment, both ends of the first protective component 310 can be connected to the two second side beams 120 of the battery pack housing 100. The second side beams 120 are provided with exhaust holes (not shown) to discharge the high-temperature and high-pressure gas from the power battery pack. In this way, when, for example, the first battery module 210 experiences thermal runaway, the high-temperature and high-pressure gas can be discharged from the power battery pack through this exhaust channel, preventing the high-temperature and high-pressure gas from affecting the second battery module 220.

[0050] Additionally, the first protective member 310 is provided with fixing members 311 on both sides. When the top cover 130 is attached to the housing, the top cover 130 will press against the fixing members 311 to fix the first protective member 310. In this way, there is no need to provide fixing holes on the first protective member 310 and the use of fasteners is reduced, thus reducing manufacturing costs. In some embodiments, the fixing member 311 may be, for example, a foam block, which is not limited here. In some embodiments, a plurality of retaining members 131 are provided on the side of the top cover 130 opposite to the battery module 200. The plurality of retaining members 131 may be constructed as block-shaped members. The retaining members 131 can absorb the impact of high temperature and high pressure gas generated during thermal runaway of the power battery pack, support the top cover 130, prevent the top cover 130 from deforming due to the impact of high temperature and high pressure gas, and maintain the strength of the top cover 130 and the power battery pack.

[0051] Combination Figure 2 , Figure 9 and Figure 10As shown, each battery module in the first battery module 210 and the second battery module 220 is provided with a cell controller (CMC) 410. The cell controller 410 is used to control the individual cell voltage, module voltage, module temperature, etc., of all cells within a single battery module. The cell controller 410 is arranged between the first battery module 210 and the second battery module 220. In some embodiments, each battery module in the first battery module 210 and the second battery module 220 has a slot on its exterior, and the cell controller 410 has a snap-fit ​​portion 411 that matches the slot, so that the cell controller 410 can be attached to the battery module 200 via its snap-fit ​​portion 411. Advantageously, each battery module 200 has an end plate arranged on its exterior, and the end plate has a recess 215 for accommodating the cell controller 410. The recess 215 is generally U-shaped and includes a sidewall with a slot. Figure 9 The diagram shows an end plate 213 of one battery module in the first battery module group 210 and a cell controller 410. The end plate 213 has a recess 215 for accommodating the cell controller 410. The recess 215 has a generally U-shaped shape, and the sidewalls of the recess 215 are provided with slots 214. Preferably, two slots 214 are symmetrically provided on the two sidewalls of the recess 215. The two ends of the cell controller 410 are provided with snap-fit ​​portions 411. In this way, the cell controller 410 is attached between the first battery module group 210 and the second battery module group 220 using the snap-fit ​​portions 411, which makes full use of the volume within the power battery pack, reduces the wiring length within the power battery pack, improves the response speed of the cell controller 410, and reduces the complexity of the power battery pack structure. In addition, in Figure 2 The power battery pack includes a junction box 420 arranged alongside the first battery module 210 along the first direction D1, and a battery management unit (TBMU) 430 arranged alongside the second battery module 220 along the first direction D1, to further maximize the utilization of the power battery pack's internal volume. The cell controller 410, junction box 420, and battery management unit 430 together constitute the battery management system (BMS).

[0052] Combination Figures 11 to 13 As shown, multiple first busbars 441 are respectively provided between each battery module in the first group of battery modules 210 and between each battery module in the second group of battery modules 220. Each first busbar 441 electrically connects each battery module in the first group of battery modules 210 and each battery module in the second group of battery modules 220. Figure 11 In this configuration, each first busbar 441 is arranged along the first direction D1 and positioned between the first group of battery modules 210 and the second group of battery modules 220 along the first direction D1. For example... Figure 11As shown, a second busbar 442 is provided between the end battery module 211 of the first battery module 210 and the end battery module 221 of the second battery module 220, and a second busbar 442 is also provided between battery module 212 and battery module 222. The second busbar 442 electrically connects battery module 211 and battery module 221 and connects battery module 212 and battery module 222, respectively. Figure 10 In this configuration, the second busbar 442 is positioned along the second direction D2 between the first battery module 210 and the second battery module 220. It is understood that the arrangement direction of the first busbar 441 and the second busbar 442 varies depending on the arrangement of the battery modules and is not limited to that shown in the figure. Figure 13 The diagram illustrates the arrangement of wiring harnesses 450 within the power battery pack according to this embodiment. Advantageously, a first wiring harness 451 is arranged between the first battery module 210 and the second battery module 220 to electrically connect the cell controller 410 of each battery module in the first and second battery modules 210 to the junction box 420 and the battery management unit 430. Furthermore, a second wiring harness 452 surrounds the outside of the battery module 200, electrically connecting the battery module 200, for example, to the vehicle's motor to provide power to the motor. This further optimizes the utilization of the power battery pack's internal volume, reduces wiring length within the power battery pack, lowers power loss within the power battery pack, improves signal transmission speed and accuracy, and enhances the safety and reliability of the power battery pack.

[0053] Reference Figure 14 In some embodiments, the side beams of the housing are provided with multiple energy-absorbing portions to resist impact forces along a first direction D1 and / or a second direction D2. Specifically, the first side beam 110 is provided with a first energy-absorbing portion 111 extending along the first direction D1, the second side beam 120 is provided with a second energy-absorbing portion 121 extending along the second direction D2, and the support beam 140 is provided with a third energy-absorbing portion 141 extending along the first direction D1 and / or the second direction D2. The first energy-absorbing portion 111, the second energy-absorbing portion 121, and the third energy-absorbing portion 141 are adapted to transmit impact forces along the first direction D1 and / or the second direction D2. Thus, when the power battery pack is subjected to an impact force along, for example, the second direction D2, the impact force can be transmitted to the second side beam 120 and the support beam 140 via the first energy absorption part 111, so that the impact force can be transmitted approximately along the entire battery pack housing 100, thereby dispersing the impact force throughout the battery pack housing 100, reducing stress concentration within the battery pack housing 100, and improving the safety and reliability of the power battery pack.

[0054] In this way, the power battery pack of the present invention has a compact structure, achieves efficient cooling, and has impact resistance. Thus, the power battery pack of the present invention can meet the requirements of safety and mechanical strength under the conditions of use.

[0055] It should be understood here that the embodiments shown in the figures only illustrate the optional shapes, sizes and arrangements of the power battery pack according to the present invention; however, they are merely illustrative and not limiting. Other shapes, sizes and arrangements may also be adopted without departing from the spirit and scope of the present invention.

[0056] The technical content and features of the present invention have been disclosed above. However, it is understood that those skilled in the art can make various changes and improvements to the disclosed concepts under the inventive concept of the present invention, all of which fall within the protection scope of the present invention. The description of the above embodiments is illustrative rather than restrictive, and the protection scope of the present invention is determined by the claims.

Claims

1. A power battery pack, characterized in that, The power battery pack comprises a box body (100) and a plurality of battery modules (200) accommodated in the box body (100), the box body (100) comprises a shell and a top cover (130) attached to the shell, the shell comprises a plurality of side beams and a bottom plate (170), Wherein, a cooling piece (150) is arranged between the plurality of battery modules (200) and the top cover (130) and / or the bottom plate (170), the cooling piece (150) is configured as a one-piece cooling plate and comprises a plurality of cooling parts corresponding to each battery module (200), and the cooling piece (150) is further provided with a plurality of avoiding holes corresponding to the structural parts in the shell.

2. The power battery pack of claim 1, wherein, The cooling piece (150) is arranged between the plurality of battery modules (200) and the bottom plate (170), and a supporting piece (160) for supporting the cooling piece (150) is arranged between the cooling piece (150) and the bottom plate (170), so that a preset gap (d) is formed between the cooling piece (150) and the bottom plate (170).

3. The power battery pack of claim 1, wherein, The bottom plate (170) is provided with a plurality of damping parts (171) spaced from each other, and each damping part (171) is recessed from the bottom plate (170) towards the inside of the shell.

4. The power battery pack of claim 3, wherein, Each damping part (171) has at least one of a hemispherical structure, a polygonal structure, and a conical structure.

5. The power battery pack of claim 1, wherein, The shell is provided with a support beam (140), and the plurality of battery modules (200) and the support beam (140) are fixed to the bottom plate (170) by a fastening structure, and the cooling piece (150) is provided with a plurality of avoiding holes corresponding to the fastening structure.

6. The power battery pack of claim 5, wherein, The plurality of side beams comprise two first side beams (110) extending along a first direction (D1), and two second side beams (120) extending along a second direction (D2) at an angle to the first direction (D1) and arranged between the two first side beams (110), Wherein, each first side beam (110) is provided with a first energy-absorbing part (111) extending along the first direction (D1), each second side beam (120) is provided with a second energy-absorbing part (121) extending along the second direction (D2), and the support beam (140) is provided with a third energy-absorbing part (141) extending along the first direction (D1) and / or the second direction (D2), and the first energy-absorbing part (111), the second energy-absorbing part (121) and the third energy-absorbing part (141) are configured to transmit impact force along the first direction (D1) and / or the second direction (D2).

7. The power battery pack of claim 6, wherein, The plurality of battery modules (200) comprises a first group of battery modules (210) and a second group of battery modules (220) juxtaposed along the first direction (D1) or the second direction (D2), and a first protection member (310) for thermal runaway protection is arranged between the first group of battery modules (210) and the second group of battery modules (220), and the first protection member (310) comprises two side portions which are respectively overlapped on the first group of battery modules (210) and the second group of battery modules (220).

8. The power battery pack of claim 7, wherein, The two side portions of the first protection member (310) are provided with a fixing member (311) for abutting by the top cover (130) to fix the first protection member (310).

9. The power battery pack of claim 7, wherein, A side of the top cover (130) facing the plurality of battery modules (200) is provided with a second protection member (320) for thermal runaway protection, and an exhaust passage is formed between the first protection member (310) and the second protection member (320).

10. The power battery pack of claim 9, wherein, The first protection member (310) and / or the second protection member (320) are made of mica and / or aerogel.

11. The power battery pack of claim 7, wherein, Each battery module in the first group of battery modules (210) and the second group of battery modules (220) is provided with a cell controller (410), and the cell controller (410) is arranged between the first group of battery modules (210) and the second group of battery modules (220).

12. The power battery pack of claim 11, wherein, An external portion of each battery module in the first group of battery modules (210) and the second group of battery modules (220) is provided with a clamping groove (214), and the cell controller (410) is provided with a clamping portion (411) matched with the clamping groove (214) to attach the cell controller (410) to the battery module (200).

13. The power battery pack of claim 12, wherein, An external portion of each battery module is arranged with an end plate (213), and the end plate (213) is provided with a recess (215) for accommodating the cell controller (410), and the recess (215) is shaped as a substantially U-shaped and comprises a side wall provided with the clamping groove (214).

14. The power battery pack of claim 7, wherein, A plurality of first busbars (441) are respectively arranged between the first group of battery modules (210) and the second group of battery modules (220) between each battery module in the first group of battery modules (210) and each battery module in the second group of battery modules (220), and each first busbar (441) is arranged between the first group of battery modules (210) and the second group of battery modules (220) along one of the first direction (D1) and the second direction (D2).

15. The power battery pack of claim 14, wherein, A second busbar (442) is arranged between the first group of battery modules (210) and the second group of battery modules (220) between at least one battery module in the first group of battery modules (210) and at least one battery module in the second group of battery modules (220), and the second busbar (442) is arranged between the first group of battery modules (210) and the second group of battery modules (220) along the other of the first direction (D1) and the second direction (D2).

16. The power battery pack of any one of claims 1-15, wherein, A side of the top cover (130) facing away from the battery module (200) is provided with a plurality of retainers (131), each of which is configured to absorb impact force when the power battery pack is in thermal runaway, so as to maintain the strength of the top cover (130).

17. A vehicle characterized by comprising: The vehicle comprises the power battery pack according to any one of claims 1-16.

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