Battery pack

Abstract

The utility model provides a battery pack which comprises a battery box body and at least one battery cell module, a bottom plate and a frame of the battery box body are integrally formed and define a cavity structure, and a liquid cooling flow channel is integrated on the bottom plate of the battery box body; the inner surface of the bottom plate of the battery box body is coated with a heat-conducting structural adhesive; and the bottom of the battery cell module is fixed on the bottom plate of the battery box body through a heat-conducting structural adhesive. The battery box body is integrally formed by the bottom plate and the frame, a reinforcing structure does not need to be independently designed to reinforce the strength and the rigidity of the box body, the liquid cooling plate is integrated on the bottom plate, the liquid cooling plate does not need to be additionally arranged, and the battery cell module does not need to be fixed with the liquid cooling plate and then secondarily fixed with the box body; and the battery cell module and the bottom plate are fixed and heat-conducted by using the heat-conducting structural adhesive, so that the space utilization rate of the battery pack is improved, the energy density of the battery is increased, the weight of the battery pack is reduced, the production procedures are reduced, and the cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery pack structure technology, and in particular to a battery pack. Background Technology

[0002] In existing commercial vehicle battery pack designs, such as Figure 1-3 As shown, to ensure stable battery pack operation, the typical design places the battery module (A2) on the bottom plate of the battery pack housing (A3), with the liquid cooling plate (A1) placed on the reinforcing structure on top of the battery module (A2), followed by the cover plate (A6). This improves both the battery's heat dissipation and the battery pack's structural strength and rigidity. The liquid cooling plate (A1) contacts the battery module (A2) on one side, while the other side is not in contact. To prevent reduced thermal management efficiency, it requires separate insulation, and additional cushioning foam is needed on the other side, increasing cost, weight, and space. Furthermore, during assembly, the liquid cooling plate (A1) must first be installed and fixed to the battery module (A2) before being secondary fixed to the battery pack housing (A3), adding production steps and increasing costs. Furthermore, in the current structural design of the battery pack, the bottom plate and the four side plates of the battery pack box (A3) are assembled together. It is necessary to design a separate reinforcement structure, such as reinforcing the crossbeams (A4) and vertical beams (A5), to enhance the strength and rigidity of the battery pack box. This results in a decrease in the overall space utilization of the battery pack box, an increase in weight, and a decrease in battery energy density.

[0003] Therefore, due to the limitations of traditional battery pack structure design, the overall space utilization of the battery pack housing is too low while meeting the requirements of heat dissipation and structural strength, which reduces the battery energy density and seriously affects the performance of the battery and battery pack. Utility Model Content

[0004] Based on the above, this utility model provides a battery pack that aims to solve technical problems in the prior art, such as the need to improve the space utilization rate of battery packs and optimize battery energy density and weight.

[0005] A battery pack includes a battery housing and at least one battery cell module. The bottom plate and the frame of the battery housing are integrally formed to form a cavity structure. A liquid cooling channel is integrated on the bottom plate of the battery housing.

[0006] The inner surface of the bottom plate of the battery box is coated with thermally conductive structural adhesive;

[0007] The bottom of the battery cell module is fixed to the bottom plate of the battery box using thermally conductive structural adhesive.

[0008] Furthermore, the battery box is provided with a middle crossbeam, the two ends of which are connected to the front and rear frames of the battery box, respectively, and are integrally formed with the battery box.

[0009] The middle crossbeam divides the cavity structure of the battery box into accommodating cavities that can independently house at least one battery cell module.

[0010] Furthermore, the battery cell module includes isolation components on both the left and right sides, and the isolation components include foam and insulating end plates;

[0011] The foam in the insulating component is placed between the battery cell and the insulating end plate of the battery cell module;

[0012] The isolation components isolate the cell module from the inside of the left frame of the battery box, the inside of the right frame of the battery box, and the side of the middle crossbeam.

[0013] Furthermore, a accommodating slot for the battery management system module is provided at the upper end of the middle crossbeam.

[0014] Furthermore, the height of the battery cell module is greater than the height of the housing cavity.

[0015] Furthermore, the front frame of the battery cell module and the rear frame of the battery box are both spaced at predetermined distances.

[0016] Furthermore, the front frame of the battery housing is equipped with mounting components for securing the battery pack and external structure.

[0017] Furthermore, the inner surface of the bottom plate of the battery box is provided with several rubber strips.

[0018] Furthermore, the battery pack also includes a cover, with the upper surface of the battery box frame and the lower surface of the cover fixedly connected.

[0019] Furthermore, the battery pack also includes an integrated cover plate on top of the case cover.

[0020] The beneficial technical effects of this utility model are as follows: the battery box is formed by the base plate and the frame as one piece, eliminating the need for a separate reinforcing structure to enhance the strength and rigidity of the battery box. The liquid cooling plate is integrated on the base plate, eliminating the need for an additional liquid cooling plate and saving the need for cushioning foam for the liquid cooling plate. Furthermore, there is no need for the battery cell module to be first installed and fixed to the liquid cooling plate and then fixed to the box. The use of thermally conductive structural adhesive allows for the fixing and heat conduction between the battery cell module and the base plate, thereby improving the overall space utilization of the battery box, thus increasing the battery energy density, reducing the weight of the battery pack, reducing production steps, and lowering costs. Attached Figure Description

[0021] Figure 1-3 This is a schematic diagram of the structure of a battery pack using existing technology.

[0022] Figure 4-10 This is a schematic diagram of the structure of a battery pack according to the present invention.

[0023] in,

[0024] A1 - Existing technology liquid cooling plate; A2 - Existing technology battery module; A3 - Existing technology battery pack housing; A4 - Existing technology crossbeam; A5 - Existing technology vertical beam; A6 - Existing technology cover plate;

[0025] 1-Battery cell module; 101-Battery cell; 102-Insulating end plate; 103-Foam;

[0026] 2-Battery housing; 201-Base plate; 202-Frame; 203-Intermediate crossbeam; 204-Battery management system module; 205-Glue strip;

[0027] 2021 - Low-pressure connector hole; 2022 - High-pressure connector hole; 2023 - Breather valve hole; 2024 - MSD mounting hole; 2025 - Inlet / outlet water holes;

[0028] 3-Box lid;

[0029] 4-Integrated cover plate. Detailed Implementation

[0030] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0033] join Figures 4-6 This utility model provides a battery pack, including a battery box (2) and at least one battery cell module (1). The bottom plate (201) and the frame (202) of the battery box (2) are integrally formed and form a cavity structure. A liquid cooling channel is integrated on the bottom plate (201) of the battery box (2).

[0034] The inner surface of the base plate (201) of the battery box (2) is coated with thermally conductive structural adhesive;

[0035] The bottom of the cell module (1) is fixed to the base plate (201) of the battery box (2) by thermally conductive structural adhesive.

[0036] The base plate (201) and the battery cell module (1) are indirectly contacted by thermally conductive structural adhesive. The base plate integrates a liquid cooling channel, eliminating the need for buffer foam for the liquid cooling plate. The base plate can both support the battery cell arrangement and cool the battery cells.

[0037] The battery housing is formed by integrating the base plate and frame, eliminating the need for a separate reinforcing structure to enhance its strength and rigidity. The liquid cooling plate is integrated into the base plate, eliminating the need for an additional liquid cooling plate. This reduces the cost of stamping liquid cooling plate molds and lowers the overall weight of the battery pack. It also saves on the need for cushioning foam for the liquid cooling plate. Furthermore, it eliminates the need for the cell modules to be first installed and fixed to the liquid cooling plate before being secondary fixed to the housing. The use of thermally conductive structural adhesive for fixing and heat conduction with the base plate improves the overall space utilization of the battery housing, thereby increasing the battery energy density, reducing the weight of the battery pack, and simultaneously reducing production steps and costs.

[0038] Specifically, the battery casing is made of aluminum profiles.

[0039] Furthermore, the battery box (2) is provided with a middle crossbeam (203), the two ends of which are connected to the front and rear frames of the battery box (2) respectively, and are integrally formed with the battery box.

[0040] The middle crossbeam (203) divides the cavity structure of the battery box (2) into accommodating cavities that independently house at least one cell module (1).

[0041] A central crossbeam is installed to form two accommodating cavities, each of which can accommodate two battery cell modules. The central crossbeam can also strengthen the structure of the battery box.

[0042] See Figures 7-8 Furthermore, the battery cell module (1) includes isolation components on both the left and right sides, the isolation components including foam (103) and insulating end plate (102);

[0043] The foam (103) in the isolation component is located between the battery cell (101) and the insulating end plate (102) of the battery cell module (1);

[0044] The isolation component isolates the inner side of the left frame of the cell module (1) and the battery box (2), the inner side of the right frame of the battery box (2), and the side of the middle crossbeam (203).

[0045] A central crossbeam forms two accommodating cavities, each capable of holding two battery cell modules. The battery cell modules are isolated from the inner sides of the left and right frames of the battery housing, and from the two sides of the central crossbeam, by insulating components. Foam cushions the battery cell modules, and insulating end plates provide insulation.

[0046] The cell module is a CTP (Cell to Pack) cell module, which includes a cell assembly consisting of several cells, as well as foam panels and insulating end plates on the left and right sides of the cell assembly. CTP (Cell to Pack) technology is an innovative battery packaging method designed to simplify battery pack design and improve its performance. The core idea of ​​this technology is to directly integrate the cells into the battery pack, skipping the traditional module level, thereby achieving more efficient space utilization, higher energy density, and lower cost.

[0047] When pressure is applied to the cell module, the foam is compressed. After compression by the extrusion fixture, the cell module is hoisted into the battery box. The clamping fixture of the extrusion fixture is released, and the insulating plastic end plate of the cell module slides freely down the bottom, left side frame, right side frame, and left and right sides of the middle crossbeam of the battery box by its own weight, thus achieving fixation.

[0048] Furthermore, the upper end of the intermediate crossbeam (203) is provided with a receiving slot for accommodating the battery management system module (204).

[0049] Specifically, a central crossbeam forms two accommodating cavities, each of which can hold two battery cell modules. The two battery cell modules within the same accommodating cavity are arranged one in front of the other.

[0050] Specifically, the battery management system module is a master-slave battery management system. The master-slave battery management system, also known as a master-slave BMS, refers to a battery management system (BMS) architecture that includes one main controller (master controller) and four auxiliary controllers (slave controllers).

[0051] The main controller is responsible for the overall control of the entire battery pack system. It receives data from various auxiliary controllers and performs centralized processing and decision-making. The auxiliary controllers are responsible for monitoring the status of each individual cell in their respective cell modules, such as voltage and temperature parameters, and transmitting this information to the main controller.

[0052] In this invention, the auxiliary controller is electrically connected to each cell of the battery cell module, and the main controller is electrically connected to the auxiliary controller. Due to the limited internal space of the battery pack, it is not possible to arrange one main and four slave BMS. Instead, a slot is cut out in the middle crossbeam inside the battery pack to accommodate the main and four slave BMS, effectively utilizing the space in the Z-direction of height. The middle crossbeam also ensures the rigidity and strength of the entire battery pack.

[0053] Furthermore, the height of the cell module (1) is greater than the height of the accommodating cavity.

[0054] For example, 2 / 3 of the height of the cell (101) of the cell module (1) is inserted into the battery box (2).

[0055] Furthermore, the front frame of the cell module (1) and the battery box (2) and the rear frame of the battery box have a predetermined distance.

[0056] Furthermore, the front frame of the battery housing (2) is provided with mounting components for securing the battery pack and the external structure.

[0057] The front frame of the battery box (2) is also provided with a low-pressure plug hole (2021), a high-pressure plug hole (2022), a water inlet and outlet hole (2025), a vent valve hole (2023), and an MSD mounting hole (2024).

[0058] The low-voltage plug hole (2021) is for low-voltage wire harnesses to pass through, and the high-voltage plug hole (2022) is for high-voltage wire harnesses to pass through.

[0059] The inlet and outlet water holes (2025) connect to the liquid cooling channels integrated in the base plate.

[0060] Vent valve orifice (2023) balances the air pressure difference between the inside of the battery pack and the external environment.

[0061] MSD (Manual Service Disconnect) mounting holes refer to the locations on the battery packs of electric or hybrid vehicles used to install MSD devices. An MSD is a safety device that allows technicians to manually disconnect high-voltage circuits before performing maintenance or repairs on the vehicle's battery system, ensuring operational safety.

[0062] Furthermore, the inner surface of the bottom plate (201) of the battery box (2) is provided with several rubber strips (205).

[0063] Considering factors such as inconsistent coating of thermally conductive structural adhesive, adhesive overflow and insulation issues caused by battery cells pressing against the bottom plate of the battery box, a baffle strip is designed on the bottom plate of the battery box to effectively avoid these problems.

[0064] Specifically, the rubber strip extends in the left and right direction, which is consistent with the extension direction of the front and rear edges of the battery box.

[0065] Specifically, the rubber-blocking strips are set at equal intervals.

[0066] See Figure 9 Furthermore, the battery pack also includes a cover (3), and the upper end face of the frame of the battery box (2) and the lower end face of the cover (3) are fixedly connected.

[0067] The upper side of the frame of the battery box (2) is provided with several mounting holes. The cover (3) has an internal cavity that can accommodate 1 / 3 of the remaining height of the battery cell module. The lower side of the cover (3) is provided with mounting holes that cooperate with the mounting holes on the upper side of the frame of the battery box (2). The cover (3) and the battery box (2) are fixedly connected through the mounting holes on the upper side of the frame of the battery box (2) and the mounting holes on the lower side of the cover (3), for example, by bolts and nuts.

[0068] See Figure 10 Furthermore, the battery pack also includes an integrated cover (4) on top of the cover (3).

[0069] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that, It includes a battery housing and at least one battery cell module. The bottom plate and the frame of the battery housing are integrally formed to form a cavity structure. The bottom plate of the battery housing is integrated with a liquid cooling channel. The inner surface of the bottom plate of the battery box is coated with thermally conductive structural adhesive; The bottom of the battery cell module is fixed to the bottom plate of the battery box by the thermally conductive structural adhesive.

2. The battery pack as described in claim 1, characterized in that, The battery box is provided with a middle crossbeam, and the two ends of the middle crossbeam are connected to the front frame and the rear frame of the battery box, respectively, and are integrally formed with the battery box. The intermediate crossbeam divides the cavity structure of the battery box into accommodating cavities that independently house at least one battery cell module.

3. A battery pack as described in claim 2, characterized in that, The battery cell module includes isolation components on both the left and right sides, and the isolation components include foam and insulating end plates. The foam in the insulating component is disposed between the battery cell of the battery cell module and the insulating end plate; The isolation component isolates the cell module from the inner side of the left frame of the battery box, the inner side of the right frame of the battery box, and the side of the middle crossbeam.

4. A battery pack as described in claim 2, characterized in that, The upper end of the intermediate crossbeam is provided with a accommodating slot for the battery management system module.

5. A battery pack as described in claim 2, characterized in that, The height of the battery cell module is greater than the height of the accommodating cavity.

6. A battery pack as described in claim 2, characterized in that, The front edge of the battery cell module and the front edge of the battery housing, as well as the rear edge of the battery housing, are all at a predetermined distance.

7. A battery pack as described in claim 2, characterized in that, The front frame of the battery housing is provided with mounting components for securing the battery pack and external structure.

8. A battery pack as described in claim 1, characterized in that, The inner surface of the bottom plate of the battery box is provided with several rubber strips.

9. A battery pack as described in claim 1, characterized in that, The battery pack also includes a cover, and the upper end face of the frame of the battery box and the lower end face of the cover are fixedly connected.

10. A battery pack as described in claim 9, characterized in that, The battery pack also includes an integrated cover plate on top of the case cover.

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