Battery pack and vehicle

Abstract

The invention relates to a battery pack and a vehicle, and the battery pack comprises a first type of module which comprises a first type of single batteries; the second-class module comprises second-class battery monomers and is arranged on at least one side of the first-class module in the first direction, and the first direction is the vehicle body width direction of the vehicle; wherein the energy density of the second type of battery monomers is lower than that of the first type of battery monomers. Under the condition of side collision of the vehicle, the second type of single batteries release low energy, the deformation threshold value of thermal runaway is high, the thermal runaway triggering time is delayed compared with that of the first type of single batteries, and more escape time can be provided for drivers and passengers. And the monomer energy density of the second type of battery monomers is low, so that the thermal runaway hazard is relatively low. By arranging the low-energy-density module on the side, in the width direction of the vehicle body, of the battery pack, the overall energy density of the battery pack is maintained, and meanwhile the side collision safety is remarkably improved.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a battery pack and a vehicle. Background Art

[0002] When considering the safety performance of new energy vehicles, the safety protection of the battery pack in the event of a side collision is crucial. In related technologies, when a vehicle experiences a side collision, the side of the battery pack is subjected to a strong impact, causing the battery cells to deform and short-circuit, leading to serious consequences such as thermal runaway, threatening the lives of drivers and passengers and the safety of vehicle operation. Summary of the Invention

[0003] To overcome the problems existing in the related art, the present disclosure provides a battery pack and a vehicle.

[0004] According to a first aspect of an embodiment of the present disclosure, a battery pack for a vehicle is provided, comprising: a first type of module, comprising a first type of battery cell; and a second type of module, comprising a second type of battery cell, arranged on at least one side of the first type of module along a first direction, the first direction being the body width direction of the vehicle; wherein the energy density of the second type of battery cell is lower than the energy density of the first type of battery cell.

[0005] In the event of a side collision, the second-type battery cells release less energy, have a higher deformation threshold for thermal runaway, and are delayed in triggering thermal runaway compared to the first-type battery cells, providing more time for the driver and passengers to escape. Furthermore, because the second-type battery cells have a lower energy density, the risk of thermal runaway is also lower. By arranging low-energy-density modules on one side of the battery pack along the width of the vehicle body, side collision safety is significantly improved while maintaining the overall energy density of the battery pack.

[0006] In some possible implementations, the first type of battery cells are square-shell battery cells, and the second type of battery cells are cylindrical battery cells.

[0007] Prismatic battery cells can achieve higher space utilization within a limited space, thereby ensuring high energy density for the entire battery pack. Cylindrical battery cells have higher radial compressive strength than prismatic battery cells, making them more suitable for withstanding lateral impacts.

[0008] In some possible embodiments, the battery pack is provided with a middle cavity and a side cavity, the first type of module is provided in the middle cavity, and the second type of module is provided in the side cavity, wherein the middle cavity and the side cavity are provided separately.

[0009] By isolating the accommodating cavities of the first type of modules and the second type of modules, when thermal runaway occurs in the second type of modules on the outside, the thermal runaway can be effectively isolated to prevent the thermal runaway from spreading to the high-energy-density first type of modules, thereby reducing the risk of chain failure of multiple modules.

[0010] In some possible implementations, potting glue is provided between the second type of module and two cavity walls of the side cavity along the first direction.

[0011] The potting compound ensures the installation stability of the second-type module. Furthermore, when the vehicle is hit from the side, the potting compound located along the first direction between the second-type module and the wall of the side cavity housing it effectively absorbs deformation and reduces the impact force on the second-type module, thereby minimizing deformation of the second-type module and reducing the risk of thermal runaway.

[0012] In some possible implementations, the side cavity is filled with the potting compound to ensure the connection stability of the second type module and to act as a buffer in all directions, thereby reducing the risk of deformation of the second type module after the battery pack is hit.

[0013] In some possible embodiments, the battery pack includes a box frame, a top cover, and a bottom plate; the middle cavity is surrounded by the box frame, the top cover, and the bottom plate; and the side cavity is surrounded by the box frame and the bottom plate.

[0014] The wall of the middle cavity can be composed of three parts to facilitate the arrangement of electrical components and other structures in the middle cavity. The wall of the side cavity can be composed of two parts to ensure the sealing effect of the side cavity and ensure the structural strength of the side cavity in the event of a side impact.

[0015] In some possible embodiments, the box frame is constructed as an integrated structure and includes a middle frame and a side frame. The middle frame is constructed with openings at both ends of the top and bottom and constitutes the circumferential cavity wall of the middle cavity. The side frame is constructed with openings at the bottom end and constitutes the circumferential cavity wall and top cavity wall of the side cavity.

[0016] In the embodiment of the present disclosure, the part of the box frame corresponding to the middle cavity is constructed as a frame structure with openings at both ends, and the part corresponding to the side cavity is a semi-closed frame structure with an opening at one end. The box frame is constructed as an integrated structure to ensure the structural strength of the box frame.

[0017] In some possible embodiments, the battery pack includes a middle exhaust space and a side exhaust space, each of which is connected to the outside of the battery pack and isolated from each other. The middle exhaust space is connected to the middle cavity, and the side exhaust space is connected to the side cavity.

[0018] When thermal runaway occurs in the first or second type modules and gas is released into the corresponding exhaust space, the isolated exhaust spaces can prevent heat diffusion from occurring, thereby ensuring the safety performance of the battery as much as possible.

[0019] In some possible implementations, the battery pack includes a bottom plate, which constitutes part of the cavity walls of the middle cavity and the side cavity, and the middle exhaust space and the side exhaust space are both formed in the bottom plate.

[0020] By using the bottom plate to form an exhaust space, the bottom space of the battery pack can be utilized to avoid occupying the installation space at the top of the battery pack. In addition, exhaust can be directed toward the bottom to ensure the safety of other components of the vehicle when the battery pack is installed in the vehicle.

[0021] In some possible implementations, a convex portion protruding upward is formed on the top surface of the bottom plate, and the middle exhaust space and the side exhaust space are separated by the convex portion.

[0022] By forming a convex portion on the bottom plate, an exhaust space is formed in the recessed area, and the convex portion can constitute an isolation structure of the exhaust space. This method of forming the exhaust space simplifies the structure and ensures good isolation of the exhaust space.

[0023] In some possible implementations, a hollow channel is formed on a cavity wall of the side cavity away from the middle cavity, and the side exhaust space is connected to the hollow channel.

[0024] An efficient pressure relief channel can be formed through the hollow cavity and the side exhaust space, reducing the risk of explosion and preventing heat from spreading to the middle cavity.

[0025] In some possible implementations, the middle cavity and the side cavity are separated by a partition beam, and a notch is provided at one end of the partition beam in the extension direction for accommodating the heat exchanger pipe.

[0026] The heat exchange tube can be extended from the outside of the battery pack into the middle cavity through one end of the middle cavity, and then extended from the middle cavity into the side cavity through the notch. The setting of the notch can optimize the layout of the battery pack thermal management system.

[0027] In some possible implementations, the battery pack includes electrical components, and the electrical components are disposed in the middle cavity.

[0028] The electrical components are arranged in the middle cavity, which makes it easier to integrate the electrical components inside the box, thereby shortening the connection length between the module and the electrical components, reducing line loss, and ensuring that the electrical components are sealed, thereby improving the safety of the electrical components.

[0029] In some possible implementations, in the first direction, the size of the first type of modules is larger than the size of the second type of modules.

[0030] Setting the first type of module to a larger size can ensure the battery energy density and the driving range. The second type of modules on both sides can provide collision protection for the first type of module in the middle, ensuring the normal use of the high energy density area.

[0031] In some possible implementations, the total power of the first type of modules is greater than the total power of the second type of modules.

[0032] The module with large power can be protected in the middle as a module to ensure battery life, while the module with small power can provide collision protection for the module with large power.

[0033] According to a second aspect of an embodiment of the present disclosure, a vehicle is provided, comprising the battery pack provided by the present disclosure.

[0034] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: in the event of a side collision of the vehicle, the second type of battery cells release less energy, have a higher deformation threshold for thermal runaway, and are delayed in triggering thermal runaway compared to the first type of battery cells, thus providing more escape time for the driver and passengers. Furthermore, since the second type of battery cells have a low energy density, the hazard of thermal runaway is also lower. By arranging low-energy-density modules on one side of the battery pack along the width direction of the vehicle body, the side collision safety is significantly improved while maintaining the overall energy density of the battery pack.

[0035] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0037] Figure 1 is an exploded view of a battery pack according to an exemplary embodiment.

[0038] Figure 2 is an exploded view of a battery pack according to an exemplary embodiment.

[0039] Figure 3 FIG2 is a schematic diagram of a battery pack case according to an exemplary embodiment.

[0040] Figure 4 is a cross-sectional view of a battery pack according to an exemplary embodiment.

[0041] Figure 5 yes Figure 4 Enlarged view of part A in .

[0042] Figure 6 is a schematic diagram of a battery pack according to an exemplary embodiment.

[0043] Figure 7 is an exploded view of a battery pack according to an exemplary embodiment.

[0044] Figure 8 is an exploded view of a battery pack according to an exemplary embodiment.

[0045] Description of Reference Numerals 10-first type module, 11-first type battery cell, 20-second type module, 21-second type battery cell, 22-cold plate, 30-middle cavity, 31-residual cavity, 40-side cavity, 41-hollow cavity, 50-potting glue, 61-box frame, 611-middle frame, 612-side frame, 62-top cover, 63-bottom plate, 631-convex part, 70-side exhaust space, 71-middle exhaust space, 80-partition beam, 81-gap. DETAILED DESCRIPTION

[0046] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present disclosure. Rather, they are merely examples of devices consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0047] When considering the safety performance of new energy vehicles, the safety protection of the battery pack in the event of a side collision is crucial. In related technologies, when a vehicle experiences a side collision, the side of the battery pack is subjected to a strong impact, causing the battery cells to deform and short-circuit, leading to serious consequences such as thermal runaway, threatening the lives of drivers and passengers and the safety of vehicle operation.

[0048] Reference Figure 1 The embodiment of the present disclosure provides a battery pack for a vehicle, the battery pack including a first type module 10 and a second type module 20. The first type module 10 includes a first type battery cell 11, and the second type module 20 includes a second type battery cell 21. Figure 1 The second type module 20 is arranged on at least one side of the first type module 10 along the first direction, such as on one side or both sides of the first type module 10 along the first direction. The first direction here is the width direction of the vehicle body, that is, the side collision direction of the vehicle.

[0049] In the embodiment of the present disclosure, the energy density of the second type battery cell 21 is lower than the energy density of the first type battery cell 11. The difference in energy density of the battery cells can be achieved by using battery cells of different sizes or using batteries of different chemical systems.

[0050] Through the above technical solution, in the event of a side collision, the second-type battery cells 21 release less energy, have a higher deformation threshold for thermal runaway, and are triggered later than the first-type battery cells 11, providing more time for the driver and passengers to escape. Furthermore, because the second-type battery cells 21 have a lower energy density, the risk of thermal runaway is also lower. By arranging low-energy-density modules on one side of the battery pack along the width of the vehicle body, side collision safety is significantly improved while maintaining the overall energy density of the battery pack.

[0051] In the present disclosure, referring to Figure 2 The energy density of the second-type battery cell 21 can be lower than that of the first-type battery cell 11 by: the first-type battery cell 11 is a prismatic battery cell, and the second-type battery cell 21 is a cylindrical battery cell. Prismatic battery cells can achieve higher space utilization within a limited space, thereby ensuring a high energy density for the entire battery pack. Cylindrical battery cells have higher radial compressive strength than prismatic battery cells, making them more suitable for withstanding lateral impacts.

[0052] In other embodiments, both the first type battery cell 11 and the second type battery cell 21 can be set as square shell battery cells, and the size of the second type battery cell 21 can be set to be smaller than the first type battery cell 11, so that the energy density of the battery cells on both sides is low to reduce the risk of thermal runaway.

[0053] Combine Figure 1 and Figure 3 The battery pack can be provided with a central cavity 30 and a side cavity 40. The first type module 10 can be provided in the central cavity 30, and the second type module 20 can be provided in the side cavity 40, wherein the central cavity 30 and the side cavity 40 are provided separately. By isolating the cavities for the first type module 10 and the second type module 20, thermal runaway can be effectively isolated when the outer second type module 20 experiences thermal runaway, preventing the thermal runaway from spreading to the high-energy-density first type module 10, thereby reducing the risk of cascading failure of multiple modules.

[0054] Combine Figure 3 、 Figure 4 、 Figure 7 and Figure 8In one embodiment of the present disclosure, the battery pack may include a box frame 61, a top cover 62, and a bottom plate 63. The middle cavity 30 may be surrounded by the box frame 61, the top cover 62, and the bottom plate 63, and the side cavity 40 may be surrounded by the box frame 61 and the bottom plate 63. The cavity wall of the middle cavity 30 may be composed of a three-part structure to facilitate the arrangement of electrical components and other structures in the middle cavity 30. The cavity wall of the side cavity 40 may be composed of a two-part structure to ensure the sealing effect of the side cavity 40 and ensure the structural strength of the side cavity 40 during side collisions.

[0055] Reference Figure 7 and Figure 8 The box frame 61 can be constructed as an integral structure and include a middle frame 611 and a side frame 612. The middle frame 611 can be constructed to be open at both ends, and the middle frame 611 can constitute the circumferential cavity wall of the middle cavity 30. The side frame 612 can be constructed to be open at the bottom end, and the side frame 612 can constitute the circumferential cavity wall and the top cavity wall of the side cavity 40. In the embodiment of the present disclosure, the portion of the box frame 61 corresponding to the middle cavity 30 is constructed as a frame structure with both ends open, and the portion corresponding to the side cavity 40 is a semi-enclosed frame structure with one end open. Constructing the box frame 61 as an integral structure can ensure the structural strength of the box frame 61. The box frame 61 can be formed by casting to form a semi-enclosed structure constituting the side cavity 40.

[0056] When the portion of the box frame 61 that forms the side cavity 40 is a semi-enclosed structure with one end open, as shown in FIG. Figure 5 As shown, cooling of the second type module 20 can be achieved by providing a cold plate 22 between the second type battery cells 21. When the second type battery cells 21 are cylindrical battery cells, the cold plate 22 can be a serpentine cold plate to adapt to the structure of the battery cells for sufficient cooling.

[0057] Reference Figure 4 The battery pack may include an intermediate exhaust space 71 and a side exhaust space 70, which are respectively used to communicate with the outside of the battery pack and are isolated from each other. The intermediate exhaust space 71 is connected to the intermediate cavity 30, and is used to relieve pressure and exhaust the first type module 10 in the intermediate cavity 30. The side exhaust space 70 is connected to the side cavity 40, and is used to relieve pressure and exhaust the second type module 20 in the side cavity 40. When the first type module 10 or the second type module 20 has a thermal runaway and releases gas into the corresponding exhaust space, the isolated exhaust spaces can avoid the occurrence of heat diffusion, thereby ensuring the safety performance of the battery as much as possible. In the embodiment of the present disclosure, when there are side exhaust spaces 70 on both sides of the intermediate exhaust space 71, the three exhaust spaces are not connected to each other to avoid mutual influence during thermal runaway.

[0058] When the battery pack includes the aforementioned bottom plate 63, and the bottom plate 63 forms part of the walls of the central cavity 30 and the side cavity 40, the central exhaust space 71 and the side exhaust space 70 can both be formed on the bottom plate 63. Using the bottom plate 63 to form the exhaust space allows the battery pack's bottom space to be utilized, avoiding occupying the top installation space. Furthermore, exhaust can be directed toward the bottom, ensuring the safety of other vehicle components when the battery pack is installed in the vehicle. In other embodiments, the exhaust space can also be formed on the top cover 62.

[0059] Reference Figure 8 The top surface of the bottom plate 63 is formed with an upwardly protruding protrusion 631, which serves to separate the middle exhaust space 71 from the side exhaust space 70. By forming the protrusion 631 on the bottom plate 63, an exhaust space is formed in the recessed area, and the protrusion 631 serves as a structure to isolate the exhaust space. This method of forming the exhaust space simplifies the structure while ensuring good isolation of the exhaust space. The protrusion 631 can be sealed with the separation beam 80 described below.

[0060] Combine Figure 4 and Figure 6 The side cavity 40, away from the central cavity 30, can be formed with a hollow channel 41 in the cavity wall. The side exhaust space 70 is connected to the hollow channel 41. In the event of thermal runaway in the second-type module 20, the runaway gas can be released toward the side exhaust space 70 at the bottom plate 63 and enter the hollow channel 41. The hollow channel 41 and the side exhaust space 70 form an efficient pressure relief channel, reducing the risk of deflagration and preventing heat from spreading into the central cavity 30.

[0061] According to one embodiment of the present disclosure, referring to Figure 2 and Figure 5 The second type of module 20 and the side cavity 40 are arranged along the first direction (ie Figure 5 A potting compound 50 is disposed between the two cavity walls (in the left and right directions of the drawing). The potting compound 50 ensures the installation stability of the second-type module 20. Furthermore, when the vehicle is struck by a side collision, the potting compound 50 located along the first direction between the second-type module 20 and the cavity wall of the side cavity 40 housing it effectively absorbs deformation from the impact and reduces the impact force on the second-type module 20, thereby minimizing deformation of the second-type module 20 and reducing the risk of thermal runaway.

[0062] It is understood that the potting compound 50 is applied between the second-type module 20 and the wall of the side cavity 40 via a liquid potting method. Therefore, after curing, the potting compound 50 can be present around the entire perimeter of the second-type module 20, not just on both sides along the first direction. Furthermore, the potting compound 50 can also be applied around the perimeter of each second-type battery cell 21 to ensure connection reliability throughout the entire second-type module 20.

[0063] In the disclosed embodiment, the side cavity 40 can be filled with potting compound 50 to ensure the connection stability of the second type module 20 and to act as a buffer in all directions, thereby reducing the risk of deformation of the second type module 20 after the battery pack is hit.

[0064] Reference Figure 3 As shown, the middle cavity 30 and the side cavity 40 can be separated by a partition beam 80. Figure 4 and Figure 5 As shown, the bottom plate 63 can be connected to the bottom surface of the partition beam 80, and the partition beam 80 can be integrally cast with the box frame 61 mentioned above. Figure 6 , and a notch 81 is provided at one end of the extending direction of the partition beam 80 to accommodate the heat exchange tube. The heat exchange tube is used to exchange heat with the second type module 20 in the side cavity 40. A through hole can be provided on the cavity wall on one side of the middle cavity 30, and the heat exchange tube can extend from the outside of the battery pack into the middle cavity 30 through one end of the middle cavity 30, and then extend the heat exchange tube from the middle cavity 30 into the side cavity 40 through the notch 81. The provision of the notch 81 can optimize the layout of the battery pack thermal management system.

[0065] In the embodiment of the present disclosure, the battery pack may include electrical components, which may be disposed in the middle cavity 30. Figure 6 , the first type module 10 and the side cavity wall of the intermediate cavity 30 along the second direction can be spaced apart to form a residual cavity 31 at the space, and the residual cavity 31 is used to accommodate electrical components. The second direction can be perpendicular to the first direction. The arrangement of electrical components in the intermediate cavity 30 can facilitate integration inside the box, thereby shortening the connection length between the module and the electrical components, reducing line losses, and ensuring that the electrical components are sealed, thereby improving the safety of the electrical components. The electrical components can be high-voltage electrical components or low-voltage electrical components, for example, they can be electrical boxes or battery pack disconnect units.

[0066] In the disclosed embodiment, the first-type module 10 is larger than the second-type module 20 in the first direction. For example, the first-type module 10 can be three times larger than the second-type module 20 in the first direction. The larger first-type module 10 ensures battery energy density and range, while the second-type modules 20 on either side provide collision protection for the central first-type module 10, ensuring normal use in the high-energy-density area.

[0067] In the disclosed embodiment, the total power of the first type module 10 can be greater than the total power of the second type module 20, so that the module with large power can be protected in the middle as a module to ensure battery life, and the module with small power can provide collision protection for the module with large power.

[0068] According to a second aspect of an embodiment of the present disclosure, a vehicle is provided, comprising the above-mentioned battery pack and having all the beneficial effects of the above-mentioned battery pack, which will not be described in detail here.

[0069] Furthermore, the word "exemplary" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "exemplary" is not necessarily to be construed as advantageous over other aspects or designs. Rather, the use of the word exemplary is intended to present concepts in a concrete manner. As used herein, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or." That is, unless otherwise specified or clear from the context, "X applies to A or B" is intended to mean any of the natural inclusive permutations. That is, if X applies to A; X applies to B; or X applies to both A and B, then "X applies to A or B" satisfies any of the aforementioned instances. Furthermore, the articles "a" and "an," as used in this application and the appended claims, are generally understood to mean "one or more," unless otherwise specified or clear from the context to refer to the singular form.

[0070] Likewise, although the present disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. With particular regard to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if not structurally equivalent to the disclosed structure. In addition, although particular features of the present disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations as may be desired and advantageous for any given or particular application. Furthermore, to the extent that the terms "include," "have," "have," "have," or variations thereof are used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term "comprising."

[0071] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

[0072] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

[0073] In the foregoing detailed description, reference is made to the accompanying drawings, which illustrate, by way of illustration, specific aspects of the present disclosure in which it may be practiced. In this regard, terms indicating directions or expressing positional relationships, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., may be used with reference to the orientation of the figures being described. Since the components of the described devices may be positioned in a plurality of different orientations, the directional terms may be used for illustrative purposes rather than restrictive. It should be understood that other aspects may be utilized and structural or logical changes may be made without departing from the concepts of the present disclosure. Therefore, the following detailed description should not be taken in a limiting sense.

[0074] It should be understood that, unless otherwise specifically noted, the features of the various embodiments of the present disclosure described herein may be combined with each other. As used herein, the term "and / or" includes any one of the relevant listed items and any combination of any two or more thereof; similarly, "at least one of" includes any one of the relevant listed items and any combination of any two or more thereof.

[0075] It should be understood that, unless otherwise expressly specified or limited, the terms "join," "attach," "install," "connect," "connect," "fix," etc. used in the embodiments of the present disclosure should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected, electrically connected, or communicable with each other; they can be directly connected, or indirectly connected through an intermediate medium, and they can be internally connected between two elements or an interactive relationship between two elements, unless otherwise expressly limited. For those skilled in the art, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0076] Additionally, the term "over" as used in reference to a component, element, or material layer being formed "over" or located "over" a surface may be used herein to mean that the component, element, or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements, or layers are disposed between the surface and the component, element, or material layer. However, the term "over" as used in reference to a component, element, or material layer being formed "over" or located "over" a surface may alternatively have a specific meaning: the component, element, or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, e.g., in direct contact with the surface.

[0077] Although terms such as "first", "second" and "third" may be used herein to describe various components, parts, regions, layers or sections, these components, parts, regions, layers or sections are not limited to these terms. On the contrary, these terms are only used to distinguish one component, part, region, layer or section from another component, part, region, layer or section. Therefore, without departing from the teachings of each example, the first component, part, region, layer or section mentioned in the examples described herein may also be referred to as the second component, part, region, layer or section. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include at least one such feature. In the description herein, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0078] It should be understood that spatially relative terms, such as "above," "upper," "below," and "lower," are used herein to describe the relationship of one element to another element shown in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as being "above" or "upper" relative to another element would then be "below" or "lower" relative to the other element. Thus, the term "above" encompasses both above and below orientations, depending on the spatial orientation of the device. The device may be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

Claims

1. A battery pack for a vehicle, characterized in that: include: The first type of module includes the first type of battery cells; as well as A second type of module, comprising a second type of battery cell, is arranged on at least one side of the first type of module along a first direction, where the first direction is a width direction of the vehicle body; The energy density of the second type of battery cells is lower than the energy density of the first type of battery cells.

2. The battery pack according to claim 1, wherein: The first type of battery cells are square-shell battery cells, and the second type of battery cells are cylindrical battery cells.

3. The battery pack according to claim 1, wherein: The battery pack is provided with a middle cavity and a side cavity, the first type of module is provided in the middle cavity, and the second type of module is provided in the side cavity, wherein the middle cavity and the side cavity are provided separately.

4. The battery pack according to claim 3, characterized in that: A potting compound is provided between the second type module and two cavity walls of the side cavity along the first direction.

5. The battery pack according to claim 4, characterized in that: The side cavity is filled with the potting glue.

6. The battery pack according to claim 3, characterized in that: The battery pack includes a box frame, a top cover and a bottom plate. The middle cavity is surrounded by the box frame, the top cover and the bottom plate, and the side cavity is surrounded by the box frame and the bottom plate.

7. The battery pack according to claim 6, characterized in that: The box frame is constructed as an integrated structure and includes a middle frame and a side frame. The middle frame is constructed with openings at both ends and constitutes the circumferential cavity wall of the middle cavity. The side frame is constructed with openings at the bottom end and constitutes the circumferential cavity wall and the top cavity wall of the side cavity.

8. The battery pack according to claim 3, wherein: The battery pack includes a middle exhaust space and a side exhaust space respectively used to communicate with the outside of the battery pack and isolated from each other. The middle exhaust space is connected to the middle cavity, and the side exhaust space is connected to the side cavity.

9. The battery pack according to claim 8, characterized in that: The battery pack includes a bottom plate, which constitutes part of the cavity walls of the middle cavity and the side cavity. The middle exhaust space and the side exhaust space are both formed in the bottom plate.

10. The battery pack according to claim 9, characterized in that: A convex portion protruding upward is formed on the top surface of the bottom plate, and the middle exhaust space and the side exhaust space are separated by the convex portion.

11. The battery pack according to claim 8, characterized in that: A hollow cavity is formed on the cavity wall of the side cavity away from the middle cavity, and the side exhaust space is communicated with the hollow cavity.

12. The battery pack according to claim 3, wherein: The middle cavity and the side cavity are separated by a partition beam, and a notch is provided at one end of the partition beam in the extending direction for accommodating the heat exchanger pipe.

13. The battery pack according to claim 3, characterized in that: The battery pack includes electrical components, and the electrical components are arranged in the middle cavity.

14. The battery pack according to claim 1, wherein: In the first direction, the size of the first type of modules is larger than the size of the second type of modules.

15. The battery pack according to claim 1, wherein: The total power of the first type of modules is greater than the total power of the second type of modules.

16. A vehicle, characterized in that: Comprising a battery pack according to any one of claims 1-15.

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