Battery pack

Abstract

The utility model relates to the technical field of batteries, and provides a battery pack, aiming at solving the problems that a foam sealing strip is easy to twist and deform when a module enters a box, a glue leakage gap is generated and glue overflows to a welding surface of the module because the foam sealing strip is stuck on the outer side of the module to block glue in the battery pack in the prior art. Comprising a box body and a module installed in the box body. A plurality of longitudinal strip-shaped grooves are formed in the inner side surface of the box body; a plurality of longitudinal strip-shaped protrusions are arranged on the outer side face of the module. The strip-shaped protrusions are matched with the strip-shaped grooves, and the strip-shaped protrusions can be inserted into the strip-shaped grooves, so that labyrinth sealing is formed between the box body and the module. According to the utility model, the longitudinal strip-shaped groove on the box body is matched with the longitudinal strip-shaped bulge on the module in the inserting manner, so that the zigzag flow channel is formed between the box body and the module, and the flowing resistance of glue in the zigzag flow channel is large, so that the glue can be effectively prevented from overflowing to the welding surface of the module during glue filling.

Description

Technical Field

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

[0002] In order to achieve vehicle loading lightweight and improve the energy density of the battery pack for current small power battery packs, the structure of the battery pack is relatively compact, the space is relatively tight, the gap between the module and the box body is small, which increases the process difficulty of the module entering the box in the subsequent manufacturing process. And in terms of design, in order to ensure the partition between the module and the box body, the method of pasting foam sealing strips on the module is often adopted.

[0003] As Figure 1 shown, the battery pack in the prior art includes a box body 1, a module 3 is arranged in the box body 1, two foam sealing strips 9 are respectively pasted on three outer side surfaces of the module 3, the foam sealing strips 9 are located between the box body 1 and the module 3, the other side surface of the module 3 is a module welding surface, the cavity between the two foam sealing strips 9 is a glue filling cavity 10, and the cavity beside the module welding surface is a welding surface cavity 11.

[0004] On the one hand, the foam sealing strip is in interference fit with the box body to play a partition role. On the other hand, the foam sealing strip plays a role in blocking glue to prevent the glue from overflowing to the module welding surface after glue filling; however, the above design has high requirements for the manufacturing process standards, and it is difficult for the module to enter the box. The flexibility of the foam is relatively strong, and its consistency in the box cannot be guaranteed when entering the box. In most cases, the interference-fitted foam sealing strip presents a twisted state in the box body, generating a glue leakage gap, and the glue will overflow to the module welding surface.

[0005] Therefore, in the process of manufacturing the battery pack, how to reduce the difficulty of the module entering the box, how to ensure the state consistency of the sealing strip in the box after entering the box, and how to ensure that the sealing strip plays a role in blocking glue and preventing glue overflow after glue filling need to be optimized, solved and improved urgently. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a battery pack to solve the problem that the battery pack in the prior art uses the method of pasting foam sealing strips on the outside of the module to block glue, and the foam sealing strip is prone to twist and deform during the process of the module entering the box, generating a glue leakage gap, and the glue will overflow to the module welding surface.

[0007] The utility model is realized by adopting the following technical solutions:

[0008] The utility model provides a battery pack, which comprises a box body and a module installed in the box body; a plurality of longitudinal strip-shaped grooves are arranged on the inner side surface of the box body; a plurality of longitudinal strip-shaped protrusions are arranged on the outer side surface of the module; the strip-shaped protrusions are adapted to the strip-shaped grooves, and the strip-shaped protrusions can be inserted into the strip-shaped grooves, so as to form a labyrinth seal between the box body and the module.

[0009] In the battery pack provided by the utility model, through the insertion and cooperation of the longitudinal strip-shaped grooves arranged on the inner side surface of the box body and the longitudinal strip-shaped protrusions arranged on the outer side surface of the module inside the box body, a zigzag flow channel is formed between the box body and the module. Compared with the prior art in which both the side surface of the box body and the side surface of the module are flat and are sealed by a foam sealing strip between the two, the strip-shaped protrusions in the utility model are inserted and arranged in the strip-shaped grooves, and will not deform, nor will glue leakage gaps be generated due to deformation; further, the flow resistance of the glue in the zigzag flow channel is large, and in combination with the curing characteristics of the glue itself, the glue can not only fill the sealing cavity between the box body and the module to ensure the sealing effect, but also the glue will not overflow to the module welding surface.

[0010] As a preferred technical solution:

[0011] A plurality of the strip-shaped grooves are formed on both the inner side surface and the outer side surface of the side plate of the box body, so that the cross section of the side plate of the box body is a continuously bent rack structure;

[0012] Wherein, the box body is integrally extruded and formed by a profile.

[0013] As a preferred technical solution:

[0014] The rack structure is a square rack structure.

[0015] As a preferred technical solution:

[0016] The strip-shaped protrusions are formed by fixedly connecting strip-shaped structures on the side surface of the module opposite to the inner side surface of the box body.

[0017] When the strip-shaped protrusions are formed by fixedly connecting strip-shaped structures on the side surface of the module opposite to the inner side surface of the box body, a suitable connection method is selected according to the material of the strip-shaped protrusions to connect them with the side plate of the module. For example, when the strip-shaped protrusions are made of a metal material, they can be fixed by welding, and when made of a non-metal material, they can be fixed by bonding.

[0018] As a preferred technical solution:

[0019] Multiple groups of the strip-shaped protrusions are arranged on at least two side surfaces of the module opposite to the inner side surface of the box body, and at least one side surface of the module is a module welding surface, and the strip-shaped protrusions are formed by processing strip-shaped structures on the side surface of the module.

[0020] When the bar-shaped protrusion is formed by directly machining a bar-shaped structure on the side plate of the module, the outer side surface of the processed side plate of the module itself has a bar-shaped protrusion structure, and there is no need to additionally connect a separate bar-shaped protrusion to the side plate of the module by other fixed connection methods. By integrating the bar-shaped protrusion with the side plate of the module, the bar-shaped protrusion can not only serve as a reinforcing rib of the side plate of the module, but also serve as a guiding sealing strip.

[0021] As a preferred technical solution:

[0022] On at least two sides of the module opposite to the inner side surface of the box body, a group of the bar-shaped protrusions are respectively arranged at both ends in the transverse direction.

[0023] As a preferred technical solution:

[0024] A zigzag and narrow flow channel is formed between the bar-shaped protrusion and the bar-shaped groove, and the flow channel serves as a sealing cavity.

[0025] As a preferred technical solution:

[0026] Glue is poured into the space between two groups of the bar-shaped protrusions, and the glue enters the sealing cavity and seals the sealing cavity.

[0027] As a preferred technical solution:

[0028] On the inner side surface of the box body opposite to the side surface of the module provided with the bar-shaped protrusion, a bar-shaped groove is provided.

[0029] As a preferred technical solution:

[0030] Both ends of the bar-shaped protrusion in the longitudinal direction are provided with wedge-shaped guiding surfaces;

[0031] A wedge-shaped surface is provided at the entrance of the box body, and the wedge-shaped guiding surface cooperates with the wedge-shaped surface.

[0032] In the utility model, wedge-shaped guiding surfaces are arranged at the ends of the bar-shaped protrusion in the longitudinal direction. The wedge-shaped guiding surfaces are used to guide the module into the box. Due to the arrangement of the wedge-shaped guiding surfaces, the size of the end of the bar-shaped protrusion is reduced, which is convenient for the bar-shaped protrusion to be inserted into the bar-shaped groove, convenient for the module to enter the box, reduces the difficulty of the module entering the box, is beneficial to shortening the installation time, and improves the work efficiency.

[0033] Among them, the cooperation between the wedge-shaped guide surface and the wedge-shaped surface means that the inclination direction of the wedge-shaped guide surface is the same as the inclination direction of the wedge-shaped surface. When the module is ready to enter the box, the wedge-shaped guide surface of the strip protrusion slides with the wedge surface of the box body, and the strip protrusion can smoothly slide into the strip groove and continuously slide down in the longitudinal direction until the module reaches the bottom of the box body. The above structure further reduces the difficulty of entering the module into the box, further shortens the installation time, and improves work efficiency.

[0034] As the preferred technical solution:

[0035] An electrical assembly is installed above the module, an upper cover is installed above the electrical assembly, and a high-voltage plug and a low-voltage plug are arranged on the upper cover.

[0036] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0037] 1. The battery pack of the utility model has a plurality of longitudinal strip grooves on the inner side of the box body, and a plurality of longitudinal strip protrusions on the outer side of the module in the box body. The strip protrusions are matched with the strip grooves. After the strip protrusions are inserted into the strip grooves, a labyrinth seal is formed between the box body and the module, which effectively prevents glue from overflowing during glue filling;

[0038] 2. The side panels of the box are continuously bent square rack structures, which increases the surface area of ​​the box, increases the external air cooling and heat dissipation contact area, and improves the heat dissipation efficiency of the battery pack;

[0039] 3. The end of the strip protrusion is designed with a wedge-shaped guide surface to facilitate the module into the box and reduce the difficulty of entering the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the structure of a battery pack in the prior art.

[0041] Figure 2 It is a schematic structural diagram of the battery pack described in the utility model.

[0042] Figure 3 for Figure 2 A magnified schematic diagram of center A.

[0043] Icons: 1-box, 2-bar-shaped protrusion, 3-module, 4-electrical assembly, 5-upper cover, 6-wedge-shaped guide surface, 7-bar-shaped groove, 8-sealed cavity, 9-foam sealing strip, 10-glue-filling cavity, 11-welding surface cavity, 12-first sealed cavity, 13-second sealed cavity. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0045] Embodiment 1

[0046] As Figure 2 and Figure 3 shown, this embodiment provides a battery pack, which includes a box body 1, an upper cover 5, and a bottom cover (not shown in the figure). The box body 1, the upper cover 5, and the bottom cover define an internal cavity separated from the external environment. The module formed by stacking single cells and other electrical components (including but not limited to, electrical components such as CCS, BMS, and BDU that make up the battery system) that make up the battery system are integrated in this internal cavity. Among them, the single cells can be soft-pack batteries or hard-shell batteries.

[0047] A plurality of longitudinal strip-shaped grooves 7 are provided on the inner side surface of the box body 1. A module 3 is installed in the box body 1. A plurality of longitudinal strip-shaped protrusions 2 are provided on the outer side surface of the module 3. The strip-shaped protrusions 2 are adapted to the strip-shaped grooves 7, and the strip-shaped protrusions 2 can be inserted into the strip-shaped grooves 7. After the strip-shaped protrusions 2 are inserted into the strip-shaped grooves 7, a labyrinth seal is formed between the box body 1 and the module 3.

[0048] In this embodiment, two sets of the strip-shaped protrusions 2 are provided on each of the three side surfaces of the module 3, and the other side surface of the module 3 is a module welding surface. The two sets of the strip-shaped protrusions 2 are respectively located at the two ends of the side surface of the module 3.

[0049] The strip-shaped grooves 7 are provided on each of the three inner side surfaces of the box body 1 corresponding to the module 3. It is possible to set the strip-shaped grooves 7 on the box body 1 with the same number and exactly corresponding positions as the strip-shaped protrusions 2 on the module 3; it is also possible to set a plurality of the strip-shaped grooves 7 on the entire side surface of the box body 1 to adapt to different modules 3. In this embodiment, a plurality of the strip-shaped grooves 7 are provided on the entire surfaces of the three side surfaces of the box body 1.

[0050] A tortuous and narrow flow channel is formed between the strip-shaped protrusions 2 and the strip-shaped grooves 7. The flow channel serves as a sealing cavity 8. After the module 3 is placed in the box, glue injection operation is carried out from the gap between the two sets of the strip-shaped protrusions 2 on the side surface of the module 3. After the glue enters the sealing cavity 8, it can seal the sealing cavity 8.

[0051] The sealing cavity 8 includes a first sealing cavity 12 and a plurality of second sealing cavities 13. The cavity formed between the innermost strip-shaped protrusion 2 of the two groups of strip-shaped protrusions 2 and the box body 1 is the first sealing cavity 12, and the cavities formed between the remaining strip-shaped protrusions 2 and the box body 1 are the second sealing cavities 13.

[0052] After potting glue in the box body 1, the glue overflows around. When the glue passes through the first sealing cavity 12 formed by the adaptation of the box body 1 and the strip-shaped protrusion 2, the glue passes through a zigzag narrow flow channel, and the flow channel reduces the flow velocity and kinetic energy of the glue and increases the fluid leakage resistance; when passing through the plurality of second sealing cavities 13, the glue flow velocity and kinetic energy are further reduced. After passing through a plurality of sealing cavities and combined with the self-curing characteristics of the glue itself, the glue cannot overflow, realizing the sealing between the box body 1 and the module 3.

[0053] In this solution, the module 3 is usually formed by stacking a plurality of single cells in one direction, and then the tabs / poles are connected in series or in parallel through integrated components such as CCS; now there are battery packs with a module-free design in the industry, directly connecting the single cells and then putting them into the box body to form a battery pack, but for the convenience of description, this intermediate state of a plurality of single cells is still called a module. The strip-shaped protrusion 2 is formed by fixedly connecting a strip structure on the side of the module 3 opposite to the inner side surface of the box body, or directly processing a strip structure on the side plate of the module 3. When the strip-shaped protrusion 2 is formed by fixedly connecting a strip structure on the side of the module 3 opposite to the inner side surface of the box body, select a suitable connection method to connect it with the side plate of the module 3 according to the material of the strip-shaped protrusion 2. For example, if the strip-shaped protrusion 2 is made of a metal material, it can be fixed by welding, and if it is made of a non-metal material, it can be fixed by bonding. When the strip-shaped protrusion 2 is formed by directly processing a strip structure on the side plate of the module 3, the outer side surface of the processed side plate of the module 3 itself has a strip-shaped protrusion structure, and there is no need to additionally connect a separate strip-shaped protrusion 2 to the side plate of the module 3 through other fixed connection methods. By integrating the design of the strip-shaped protrusion 2 and the side plate of the module 3, the strip-shaped protrusion 2 can not only serve as a reinforcing rib of the side plate of the module 3, but also serve as a guiding sealing strip.

[0054] When the strip-shaped protrusion 2 is formed by fixedly connecting a strip structure on the side of the module 3 opposite to the inner side surface of the box body, the strip-shaped protrusion 2 is made of a microporous foamed polypropylene material or other similar materials with certain compression characteristics and structural strength. Using this kind of material can ensure the consistency of the sealing strip (i.e., the strip-shaped protrusion 2) in the box body 1, ensure the fitting and sealing between the sealing strip and the inner wall of the box body 1, avoid generating glue leakage gaps, and avoid the glue overflowing to the module welding surface.

[0055] The side plates of the box body 1 are each formed with a plurality of the strip-shaped grooves 7 on both the inner side and the outer side, such that the cross-section of the side plates of the box body 1 is a continuously bent rack structure; wherein, the box body 1 as a whole can be integrally extruded and formed from a profile. In a preferred embodiment, the box body 1 is made of a metal material, such as aluminum or aluminum alloy. With such a structure, the surface area of the outer surface of the side plates of the box body 1 is increased, which can increase the contact area between the box body 1 and the external environment, increase the heat dissipation area, and can be used as heat dissipation fins to improve the heat dissipation efficiency of the battery pack in practical applications.

[0056] In this embodiment, the rack structure is a square rack structure, the cross-section of the strip-shaped groove 7 is designed as a rectangle or a square, and the strip-shaped protrusion 2 is adapted thereto. In this way, not only is it convenient for the strip-shaped protrusion 2 to be inserted into the strip-shaped groove 7 in a matching manner, which is beneficial to improving the efficiency of inserting the module 3 into the box and simplifying the box insertion operation, but also this structure is convenient for processing. It should be understood that the rack structure can also be a wavy rack structure, the cross-section of the strip-shaped groove 7 is designed as a wave shape, and the strip-shaped protrusion 2 is adapted thereto; as an alternative embodiment, the rack structure can also be a rack structure with circular arcs or elliptical arcs, the cross-section of the strip-shaped groove 7 is designed as circular arcs or elliptical arcs, and the strip-shaped protrusion 2 is adapted thereto; or the rack structure can also be a triangular rack structure, the cross-section of the strip-shaped groove 7 is designed as a triangle, and the strip-shaped protrusion 2 is adapted thereto.

[0057] Furthermore, a wedge-shaped guiding surface 6 is provided at the end of the strip-shaped protrusion 2 in the longitudinal direction. The wedge-shaped guiding surface 6 is used to guide the module 3 into the box. Due to the provision of the wedge-shaped guiding surface 6, the size of the end of the strip-shaped protrusion 2 is reduced, which facilitates the insertion of the strip-shaped protrusion 2 into the strip-shaped groove 7, facilitates the insertion of the module 3 into the box, reduces the difficulty of inserting the module 3 into the box, is beneficial to shortening the installation time, and improves the work efficiency.

[0058] Even further, a wedge-shaped surface is provided at the entrance of the box body 1. The wedge-shaped guiding surface 6 cooperates with the wedge-shaped surface to facilitate the insertion of the module 3 into the box. The inclination direction of the wedge-shaped guiding surface 6 is the same as that of the wedge-shaped surface, and the inclination angles are the same. When the module 3 is ready to be inserted into the box, the wedge-shaped guiding surface 6 of the strip-shaped protrusion 2 slides in cooperation with the wedge-shaped surface of the box body 1, and the strip-shaped protrusion 2 can smoothly slide into the strip-shaped groove 7 and continuously slide downward in the longitudinal direction until the module 3 reaches the bottom of the box body 1. With the above structure, the difficulty of inserting the module 3 into the box is further reduced, the installation time is further shortened, and the work efficiency is improved.

[0059] After the module 3 enters the box body 1, an electrical assembly 4 is installed above the module 3, and then an upper cover 5 is installed above the electrical assembly 4. High-voltage plugs and low-voltage plugs are provided on the upper cover 5 to form the battery pack.

[0060] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that: It includes a box and a module installed in the box; A plurality of longitudinal strip-shaped grooves are provided on the inner side surface of the box body; A plurality of longitudinal strip-shaped protrusions are provided on the outer side surface of the module; The strip-shaped protrusion is matched with the strip-shaped groove, and the strip-shaped protrusion can be inserted into the strip-shaped groove, so that a labyrinth seal is formed between the box body and the module.

2. The battery pack according to claim 1, characterized in that: The side plate of the box body is formed with a plurality of the strip-shaped grooves on both the inner side and the outer side, so that the cross section of the side plate of the box body is a continuously bent rack structure; Wherein, the box body is formed by extruding the profile at one time.

3. The battery pack according to claim 1, characterized in that: The strip-shaped protrusion is formed by fixing and connecting a strip-shaped structure on the side surface of the module opposite to the inner side surface of the box body.

4. The battery pack according to claim 1, characterized in that: A plurality of strip-shaped protrusions are arranged on at least two sides of the module that are opposite to the inner side of the box body, at least one side of the module is a module welding surface, and the strip-shaped protrusions are formed by processing a strip structure on the side of the module.

5. The battery pack according to claim 4, characterized in that: A group of the strip-shaped protrusions are respectively arranged at both ends in the transverse direction on at least two side surfaces of the module that are opposite to the inner side surface of the box body.

6. The battery pack according to claim 5, characterized in that: A tortuous and narrow flow channel is formed between the strip-shaped protrusion and the strip-shaped groove, and the flow channel serves as a sealed cavity.

7. The battery pack according to claim 6, characterized in that: The space between the two groups of strip-shaped protrusions is filled with glue, and the glue enters the sealing cavity and seals the sealing cavity.

8. The battery pack according to claim 4, characterized in that: The box body is provided with the strip-shaped groove on the inner side surface opposite to the side surface on which the strip-shaped protrusion is provided on the module.

9. The battery pack according to claim 1, characterized in that: The strip-shaped protrusion is provided with wedge-shaped guiding surfaces at both ends in the longitudinal direction; A wedge-shaped surface is arranged at the entrance of the box body, and the wedge-shaped guide surface cooperates with the wedge-shaped surface.

10. The battery pack according to any one of claims 1 to 9, characterized in that: An electrical assembly is installed above the module, an upper cover is installed above the electrical assembly, and a high-voltage plug and a low-voltage plug are arranged on the upper cover.

Images