Battery pack and vehicle

Abstract

The utility model provides a battery pack and a vehicle, the battery pack comprises a box body assembly, a battery module and a first BMS assembly, the box body assembly comprises a bottom wall and a side wall which are arranged along the height direction of the battery pack, and the bottom wall and the side wall form a mounting cavity; the plurality of battery modules are mounted in the mounting cavity; and the first BMS assembly is electrically connected with the battery module, and the first BMS assembly is installed in the installation cavity and located on the side, away from the bottom wall, of the battery module. The technical problem that the energy density of a battery pack is affected when a BMS is arranged between battery modules can be solved.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, specifically to a battery pack and a vehicle. Background Technology

[0002] In related technologies, when multiple battery modules are set up, they are usually placed side by side along the length of the battery pack, with the BMS placed between two adjacent battery modules. However, due to the limited space along the length of the battery pack, the volume of the battery modules needs to be reduced in order to make room for the installation of the BMS, which will affect the energy density of the battery pack. Utility Model Content

[0003] The present invention provides a battery pack and a vehicle that can improve the technical problem of affecting the energy density of the battery pack by placing the BMS between the battery modules.

[0004] In a first aspect, embodiments of the present invention provide a battery pack, comprising:

[0005] The housing assembly includes a bottom wall and a side wall arranged along the height direction of the battery pack, the bottom wall and the side wall forming a mounting cavity;

[0006] Battery modules are installed within the mounting cavity, and there are multiple battery modules;

[0007] The first BMS component is electrically connected to the battery module. The first BMS component is installed in the mounting cavity and is located on the side of the battery module away from the bottom wall.

[0008] In one embodiment, the battery pack further includes a crossbeam mounted within the mounting cavity, and the first BMS assembly is connected to the crossbeam.

[0009] In one embodiment, the battery pack further includes a mounting component, the mounting component including a mounting portion and a first connecting portion connected to each other, the first BMS component being connected to the mounting portion, at least a portion of the mounting portion being located between the battery module and the first BMS component, one end of the first connecting portion being connected to the side of the mounting portion facing the crossbeam, and the other end being connected to the crossbeam.

[0010] In one embodiment, the first BMS component includes a first BMS and a second BMS, which are electrically connected to the battery module, respectively. The mounting portion includes a first mounting portion and a second mounting portion disposed along the width direction of the battery pack. The first BMS is connected to the first mounting portion, and the second BMS is connected to the second mounting portion.

[0011] In one embodiment, the first BMS component further includes a mounting bracket and a third BMS. The mounting bracket is connected to the mounting portion and forms a mounting space with the side of the mounting portion opposite to the battery module for mounting the first BMS. The third BMS is electrically connected to the battery module and is fixed to the side of the mounting bracket opposite to the battery module.

[0012] In one embodiment, the battery pack further includes a first buffer, and the housing assembly further includes a cover disposed opposite to the bottom wall. The cover is connected to the side wall to shield the mounting cavity, and the buffer is disposed between the first BMS assembly and the cover.

[0013] In one embodiment, the first buffer includes a first side and a second side disposed along the height direction of the battery pack, the first side being connected to the cover and the second side being connected to the first BMS component.

[0014] In one embodiment, two first buffers are configured: one first buffer is disposed on the side of the third BMS facing away from the battery module, and the other first buffer is disposed on the side of the second BMS facing away from the battery module.

[0015] In one embodiment, the battery pack further includes a second buffer member sandwiched between the mounting portion and the battery module.

[0016] In one embodiment, the crossbeam divides the mounting cavity into a battery cavity and an electrical cavity arranged along the length of the battery pack, wherein the battery module and the first BMS component are installed in the battery cavity; the battery pack further includes a second BMS component, which is installed in the electrical cavity and is electrically connected to the first BMS component and the battery module respectively.

[0017] In one embodiment, the battery module includes a first battery module and a second battery module, the first battery module being disposed near the bottom wall, the second battery module being located on the side of the first battery module facing away from the bottom wall, and the first BMS component being located on the side of the second battery module facing away from the first battery module.

[0018] Secondly, embodiments of the present invention provide a vehicle including the aforementioned battery pack.

[0019] The beneficial effects of the embodiments of this utility model are as follows:

[0020] In an embodiment of this invention, the first BMS component is installed within the mounting cavity and located on the side of the battery module facing away from the bottom wall. That is, the first BMS component, the battery module, and the bottom wall are arranged along the height direction of the battery pack. Since the length direction of the battery pack is limited, while the height direction often has a larger space, arranging the first BMS component and the battery module along the height direction of the battery pack, and installing the first BMS component in the height direction of the battery pack, does not require reducing the volume of the battery module, thus not affecting the energy density of the battery pack. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a perspective view of the battery pack provided in an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A schematic diagram of the battery pack structure with the portion removed;

[0024] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0025] Figure 4 yes Figure 1 A schematic diagram of the structure for removing the battery pack cover;

[0026] Figure 5 yes Figure 4 A magnified view of a section at point B in the middle;

[0027] Figure 6 yes Figure 2 First cross-sectional view of the battery pack in the image;

[0028] Figure 7 yes Figure 1 Second cross-sectional view of the battery pack in the middle;

[0029] Figure 8 yes Figure 7 A magnified view of a section at point C;

[0030] Figure 9 This is a block diagram of a vehicle provided in an embodiment of this utility model. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0032] To improve the range of battery packs, the number of cells in battery modules is increasing, and the number of cells is also increasing. In order to manage the multiple cells of the battery module, multiple BMS are set up. In related technologies, multiple BMS are often set up between battery modules. However, this will occupy the space of the battery module and affect the energy density of the battery pack.

[0033] Firstly, please combine Figure 1 This application provides a battery pack 10.

[0034] Please combine Figure 2 The battery pack 10 includes: a housing assembly 100, a battery module 200, and a first BMS assembly 300. The housing assembly 100 includes a bottom wall 110 and a side wall 130 arranged along the height direction of the battery pack 10, and the bottom wall 110 and the side wall 130 form a mounting cavity 140. The battery module 200 is installed in the mounting cavity 140, and there are multiple battery modules 200. The first BMS assembly 300 is electrically connected to the battery module 200, and the first BMS assembly 300 is installed in the mounting cavity 140 and located on the side of the battery module 200 away from the bottom wall 110.

[0035] In these embodiments, the housing assembly 100 includes a bottom wall 110 and a side wall 130 arranged along the height direction of the battery pack 10, forming a mounting cavity 140. A battery module 200 is mounted within the mounting cavity 140, meaning the battery module 200 and the bottom wall 110 are arranged along the height direction of the battery pack 10. Multiple battery modules 200 are present, and these multiple battery modules 200 are arranged along the height direction of the battery pack 10 with the bottom wall 110. A first BMS assembly 300 is electrically connected to the battery module 200.

[0036] A battery module 200 can be a unit composed of several battery cells connected in series or in parallel. Multiple battery modules 200 can be connected in series.

[0037] The first BMS component 300 can be configured to connect to some cells of a battery module 200, the first BMS component 300 can be configured to connect to all cells of a battery module 200, or the first BMS component 300 can be configured to connect to cells of multiple battery modules 200.

[0038] The first BMS component 300 is installed within the mounting cavity 140 and is located on the side of the battery module 200 facing away from the bottom wall 110. That is, the first BMS component 300, the battery module 200, and the bottom wall 110 are arranged along the height direction of the battery pack 10. Since the length space within the battery pack is limited, while the height direction of the battery pack often has a larger space, arranging the first BMS component 300 and the battery module 200 along the height direction of the battery pack 10, and installing the first BMS component 300 in the height direction of the battery pack, does not require reducing the volume of the battery module, thus not affecting the energy density of the battery pack.

[0039] The battery pack 10 also includes a crossbeam 700, which is installed in the mounting cavity 140, and the first BMS assembly 300 is connected to the crossbeam 700.

[0040] In these embodiments, since the first BMS component 300 is installed in the mounting cavity 140 and has a short distance from the crossbeam 700, the connection distance between the first BMS component 300 and the crossbeam 700 is shorter when the first BMS component 300 is connected to the crossbeam 700. Smaller connectors can be used to connect the first BMS component 300 and the crossbeam 700. Compared to the scheme of connecting the first BMS component to the cover, since the distance between the first BMS component and the cover is usually greater than the connection distance between the first BMS component 300 and the crossbeam 700, larger connectors are often required, resulting in excessive space occupation between the battery module 200 and the casing.

[0041] A crossbeam 700 is installed in the mounting cavity 140, dividing the mounting cavity 140 into a battery cavity 141 and an electrical cavity 143 arranged along the length of the battery pack. The battery module 200 and the first BMS assembly 300 are installed in the battery cavity 141.

[0042] Please combine Figure 5 The crossbeam 700 can extend along the width direction of the battery pack 10. The crossbeam 700 can include a first end and a second end along the width direction of the battery pack 10, and a third end and a fourth end along the height direction of the battery pack. The first end and the second end can be connected to the side wall 130 respectively, the third end can be connected to the bottom wall, and the fourth end 770 is located at the end of the crossbeam away from the bottom wall. The first BMS assembly 300 is connected to the fourth end 770.

[0043] In these embodiments, the first BMS component 300 is mounted in the battery cavity 141 and located on the side of the battery module 200 facing away from the bottom wall 110, so that the first BMS component 300 does not encroach on the space between the battery modules 200. This allows for a larger volume of battery modules 200 to be arranged inside the battery pack. Furthermore, compared to the related art where the BMS is often mounted in the housing, in this embodiment, the crossbeam 700 is mounted in the mounting cavity 140 and divides the mounting cavity 140 into a battery cavity 141 and an electrical cavity 143. The first BMS component 300 located in the battery cavity 141 is fixed to the crossbeam 700. In other words, the arrangement direction of the first BMS component 300 and the crossbeam 700 is the same as the arrangement direction of the battery cavity 141 and the electrical cavity 143.

[0044] The bottom wall 110 and side wall 130 of the housing assembly 100 can be integrally formed. For example, the bottom wall 110, side wall 130, and mounting cavity 140 of the housing assembly 100 can be formed by stamping the housing assembly 100.

[0045] The bottom wall 110 and side wall 130 of the housing assembly 100 can be designed separately. For example, the bottom wall 110 and side wall 130 can be connected by means of screwing, welding, snap-fitting, etc. to form a mounting cavity 140.

[0046] The crossbeam is installed in the mounting cavity 140. In some examples, the crossbeam can be connected to the side wall 130, for example, by screwing, welding, or snap-fitting.

[0047] The crossbeam 700 can be an expansion beam for the battery pack 10. The crossbeam 700 can be in direct or indirect contact with the battery module 200, so that when the volume of the battery module 200 changes under conditions such as charging and discharging, the crossbeam 700 can provide support and protection for the battery module 200.

[0048] By setting a crossbeam 700, the mounting cavity 140 is divided into a battery cavity 141 and an electrical cavity 143. The battery module 200 is installed in the battery cavity 141, which can cope with the volume expansion of the battery module cells due to temperature changes during charging and discharging. In addition, the crossbeam 700 can also enhance the structural strength of the battery pack and provide additional protection in the event of a side collision.

[0049] The battery cavity 141 and the electrical cavity 143 are arranged along the length of the battery pack, and the first BMS component 300 and the battery module 200 are arranged along the height of the battery pack.

[0050] A battery module can be a unit composed of several battery cells connected in series or parallel. The internal components of a battery module can integrate connectors, protection circuits, temperature sensors, etc., to ensure safe and efficient energy transfer.

[0051] The battery module 200 and the first BMS component 300 can be electrically connected, and the first BMS component 300 can manage and control the battery module 200. The first BMS component 300 can have one or more of the following functions: First, it can continuously collect status information about each cell in the battery module, such as temperature, voltage, and current, and assess the overall health of the battery module accordingly. Second, based on the collected data, the BMS can calculate key indicators such as SOC (State of Charge), SOH (State of Health), and SOP (State of Power). Third, it can prevent problems such as overcharging, over-discharging, and overheating of the battery; for example, when an abnormality is detected, it can cut off the circuit or send an alarm signal to the external control system. Fourth, it can balance the charge levels between individual cells through active or passive methods, thereby extending the lifespan of the entire battery pack. Fifth, it can also be equipped with a standardized communication protocol (such as CAN bus) to exchange data with other vehicle electronic devices.

[0052] Please combine Figure 3 , Figure 4 as well as Figure 5 In some embodiments, the battery pack 10 further includes a mounting member 400, which includes a mounting portion 401 and a first connecting portion 403 connected together. The first BMS component 300 is connected to the mounting portion 401. At least a portion of the mounting portion 401 is located between the battery module 200 and the first BMS component 300. One end of the first connecting portion 403 is connected to the side of the mounting portion 401 facing the crossbeam 700, and the other end is connected to the crossbeam 700.

[0053] In some examples, the mounting part 401 can be a flat plate structure, the first connecting part 403 can be a stepped structure, and the plane where the mounting part 401 is located is further away from the bottom wall 110 relative to the end of the first connecting part 403 that is connected to the crossbeam 700.

[0054] In these embodiments, the mounting portion 401 and the first connecting portion 403 can be integrally formed. In other embodiments, the mounting portion 401 and the first connecting portion 403 can be connected by welding, bonding, or other methods. The first BMS component 300 is connected to the mounting portion 401, and the connection between the first BMS component 300 and the mounting portion 401 can be screwed or snap-fitted.

[0055] Please combine Figure 5 as well as Figure 6The mounting part 401 is installed on the side of the battery module 200 facing away from the bottom wall 110. The first BMS component 300 is installed on the side of the mounting part 401 facing away from the battery module 200. The first connecting part 403 connects the mounting part 401 and the crossbeam 700. In this way, the first BMS component 300 is connected to the crossbeam 700 through the mounting part 400, avoiding direct contact between the first BMS component 300 and the battery module 200, which would affect heat dissipation. One end of the first connecting part 403 is connected to the side of the mounting part 401 facing the crossbeam 700, and the other end is connected to the crossbeam 700, making the overall length of the first connecting part 403 relatively small and taking up less space in the battery cavity 141.

[0056] Furthermore, by connecting the first BMS component 300 to the mounting part 401, and by connecting the first BMS component 300 to the crossbeam 700 through the mounting part 401 and the first connecting part 403, the versatility and structural strength of the first BMS component 300 are improved.

[0057] Please combine Figure 5 as well as Figure 6 In some embodiments, the first BMS component 300 includes a first BMS 310 and a second BMS 320, which are electrically connected to the battery module 200. The mounting portion 401 includes a first mounting portion 410 and a second mounting portion 430 arranged along the width direction of the battery pack. The first BMS 310 is connected to the first mounting portion 410, and the second BMS 320 is connected to the second mounting portion 430. This arrangement of the first BMS 310 and the second BMS 320 along the width direction of the battery pack on the side of the battery module 200 opposite to the bottom wall 110 fully utilizes the width and height directions of the battery pack, resulting in a more compact internal structure.

[0058] Please combine Figure 5 as well as Figure 7 In some embodiments, the first BMS component 300 further includes a mounting bracket 800 and a third BMS 330. The mounting bracket 800 is connected to the mounting part 401 and forms a mounting space 801 with the side of the mounting part 401 opposite to the battery module 200 for mounting the first BMS 310. The third BMS 330 is electrically connected to the battery module 200 and is fixed to the side of the mounting bracket 800 opposite to the battery module 200.

[0059] When there are many cells in the battery module, multiple BMS need to be set. In these embodiments, by setting the mounting bracket 800 and the mounting part 400, the first BMS 310 is set in the mounting space 801 formed by the mounting bracket 800 and the mounting part 401 on the side away from the battery module 200, which can fix the first BMS 310. Then, the third BMS 330 is fixed on the side of the mounting bracket 800 away from the battery module 200. That is, the mounting bracket 800 also has the function of fixing the third BMS 330.

[0060] In these embodiments, the mounting bracket 800 and the mounting portion 401 can be detachably connected, such as by screws or snaps. The first BMS 310 is mounted on the third BMS 330 and electrically connected to the battery module 200, thereby enabling the management and control of the battery module 200.

[0061] Please combine Figure 6 as well as Figure 7 In some embodiments, the battery pack further includes a first buffer 510, and the housing assembly 100 further includes a cover 150 disposed opposite to the bottom wall 110. The cover 150 is connected to the side wall 130 to cover the mounting cavity 140. The first buffer 510 is disposed between the first BMS assembly 300 and the cover 150.

[0062] In these embodiments, a first buffer 510 is disposed between the first BMS assembly 300 and the cover 150 to prevent the first BMS assembly 300 from shaking during vibration. In some examples, the first buffer 510 may be foam.

[0063] Please combine Figure 5 as well as Figure 7 In some embodiments, the first buffer 510 includes a first side 511 and a second side 513 disposed along the height direction of the battery pack 10. The first side 511 is connected to the cover 150, and the second side 513 is connected to the first BMS assembly 300. Thus, the first buffer 510 can relatively fix the cover 150 and the first BMS assembly 300, making the battery pack more stable overall. The first side 511 is bonded to the cover 150, and the second side 513 is bonded to the first BMS assembly 300.

[0064] In some embodiments, two first buffers 510 are configured, one first buffer 510 is disposed on the side of the third BMS330 away from the battery module 200, and the other first buffer is disposed on the side of the second BMS320 away from the battery module 200, which facilitates installation and replacement.

[0065] Furthermore, depending on the distance between the third BMS330 and the lid, and the distance between the second BMS320 and the lid, different thicknesses of the first buffer 510 can be used, thereby enabling a stable connection between the third BMS330 and the lid, and a stable connection between the second BMS320 and the lid.

[0066] Please combine Figure 5 In some embodiments, the battery pack 10 further includes a second buffer 530, which is sandwiched between the mounting portion 401 and the battery module 200. The second buffer 530 may be foam, and may be adhered to one side of the battery module 200.

[0067] In some embodiments, the battery pack further includes a second BMS component 600, with the battery cavity 141 and the electrical cavity 143 arranged along the length of the vehicle. The second BMS component 600 is mounted in the electrical cavity 143 and is electrically connected to the first BMS component 300 and the battery module, respectively.

[0068] In these embodiments, the second BMS component 600 is mounted in the electrical cavity 143, and the first BMS component 300 is mounted in the battery cavity 141. The battery cavity 141 and the electrical cavity 143 are arranged along the length of the vehicle, meaning that the second BMS component 600 and the first BMS component 300 are arranged along the length of the vehicle. Meanwhile, since the first BMS component 300 is located on the side of the battery module 200 facing away from the bottom wall 110, whereas the battery module 200 and the bottom wall 110 are typically arranged along the height of the vehicle, the second BMS component 600, the first BMS component 300, and the battery module 200 fully utilize the space in all directions of the vehicle, resulting in a more compact structure and smaller size.

[0069] Please combine Figure 8 In some embodiments, the battery module 200 includes a first battery module 210 and a second battery module 230. The first battery module 210 is disposed near the bottom wall 110, and the second battery module 230 is located on the side of the first battery module 210 away from the bottom wall 110. The first BMS component 300 is located on the side of the second battery module 230 away from the first battery module 210.

[0070] Please combine Figure 9 Secondly, this application also provides a vehicle 20, including the aforementioned battery pack 10.

[0071] In this embodiment, the vehicle may be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this disclosure does not make any specific limitation in this regard.

[0072] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery pack, characterized by, The battery pack (10) comprises: a box assembly (100) comprising a bottom wall (110) and a side wall (130) arranged along a height direction of the battery pack (10), the bottom wall (110) and the side wall (130) forming a mounting cavity (140); a plurality of battery modules (200) mounted in the mounting cavity (140); and a first BMS assembly (300) electrically connected with the battery modules (200), the first BMS assembly (300) being mounted in the mounting cavity (140) and located on a side of the battery modules (200) away from the bottom wall (110).

2. The battery pack of claim 1, wherein, The battery pack (10) further comprises a cross beam (700) mounted in the mounting cavity (140), and the first BMS assembly (300) is connected with the cross beam (700).

3. The battery pack according to claim 2, wherein The battery pack (10) further comprises a mounting member (400) comprising a mounting portion (401) and a first connecting portion (403) connected with each other, the first BMS assembly (300) is connected with the mounting portion (401), at least part of the mounting portion (401) is located between the battery modules (200) and the first BMS assembly (300), one end of the first connecting portion (403) is connected to a side of the mounting portion (401) facing the cross beam (700), and the other end is connected with the cross beam (700).

4. The battery pack according to claim 3, wherein The first BMS assembly (300) comprises a first BMS (310) and a second BMS (320), the first BMS (310) and the second BMS (320) are electrically connected with the battery modules (200) respectively, the mounting portion (401) comprises a first mounting portion (410) and a second mounting portion (430) arranged along a width direction of the battery pack, the first BMS (310) is connected with the first mounting portion (410), and the second BMS is connected with the second mounting portion (430).

5. The battery pack of claim 4, wherein, The first BMS assembly (300) further comprises a mounting bracket (800) and a third BMS (330), the mounting bracket (800) is connected with the mounting portion (401) and forms a mounting space (801) on a side of the mounting portion (401) away from the battery modules (200) for mounting the first BMS (310), and the third BMS (330) is electrically connected with the battery modules (200) and is fixed to a side of the mounting bracket away from the battery modules (200).

6. The battery pack of claim 5, wherein, The battery pack further comprises a first buffer (510), the box assembly (100) further comprises a box cover (150) oppositely arranged with the bottom wall (110), the box cover (150) is connected with the side wall (130) to shield the mounting cavity (140), and the buffer (510) is arranged between the first BMS assembly (300) and the box cover (150).

7. The battery pack of claim 6, wherein, The first buffer (510) comprises a first side (511) and a second side (513) arranged along the height direction of the battery pack, the first side (511) is connected with the box cover (150), and the second side (513) is connected with the first BMS assembly (300).

8. The battery pack of claim 6, wherein, The first buffer is configured as two, one of the first buffers is arranged on the side of the third BMS (330) away from the battery module (200), and the other of the first buffers is arranged on the side of the second BMS (320) away from the battery module (200).

9. The battery pack of claim 3, wherein, The battery pack (10) further comprises a second buffer (530), and the second buffer (530) is clamped between the mounting portion (401) and the battery module (200).

10. The battery pack of claim 2, wherein, The cross beam (700) divides the mounting cavity (140) into a battery cavity (141) and an electrical cavity (143) arranged along the length direction of the battery pack, the battery module (200) and the first BMS assembly (300) are installed in the battery cavity (141), the battery pack further comprises a second BMS assembly (600), the second BMS assembly (600) is installed in the electrical cavity (143), and the second BMS assembly (600) is electrically connected with the first BMS assembly (300) and the battery module (200) respectively.

11. The battery pack of claim 1, wherein, The battery module (200) comprises a first battery module (210) and a second battery module (230), the first battery module (210) is arranged close to the bottom wall (110), the second battery module (230) is located on the side of the first battery module (210) away from the bottom wall (110), and the first BMS assembly (300) is located on the side of the second battery module (230) away from the first battery module (210).

12. A vehicle (20) characterized by, The battery pack comprises the battery pack according to any one of claims 1-11. The battery pack comprises the battery pack according to any one of claims 1-11.

Images