A novel battery module

Abstract

The utility model provides a novel battery module relates to lithium battery technical field, and the bottom plate outside is equipped with the outer cover, and the outer cover inner wall is fixed with the same number of several columns passageways with the electric core group, is equipped with the butt joint of the passageway bottom, and the butt joint corresponds with the pressure -relief portion, and the butt joint area is greater than the area of pressure -relief portion, the passageway inside is hollow, and the outer cover outer end is provided with pressure -relief valve, and the pressure -relief valve sets up in the passageway and is away from the side of butt joint, and the single electric core is square shell electric core, and the battery group periphery both sides are provided with the end plate, and the battery group outside is equipped with the steel band of all battery group and end plate hoop tight, and the pressure sprays from the pressure -relief portion, and the gas -liquid solid mixture that sprays along also has, and the passageway inside space can supply to pressure -relief, and because the passageway inside has no circuit system, can play the role of thermoelectric separation.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and more specifically, to a novel battery module. Background Technology

[0002] Lithium-ion batteries, as a popular energy storage product, are playing an increasingly significant role in daily life, industry, and military applications. Also known as a battery cell or lithium-ion battery cell, it is the most basic building block of a lithium-ion battery. It generally consists of three main parts: positive and negative electrodes, an electrolyte, and a separator, and is the fundamental unit for storing and releasing energy in a lithium-ion battery. If classified according to the positive electrode material, battery cells can be divided into several types, such as the common ternary lithium-ion cells and lithium iron phosphate cells.

[0003] A battery pack is a battery system composed of a certain number of battery cells connected in series and parallel according to a pre-designed structure. By connecting cells in series, the voltages of multiple cells are summed to achieve an output voltage based on a multiple of the cell voltage; conversely, by connecting cells in parallel, the capacities of multiple cells are summed to provide an energy capacity based on a multiple of the cell capacity. The design and structure of a battery pack can be customized according to different spatial structures and application scenarios. A battery module is a modular component created by adding necessary circuitry and control units to the battery pack. The design and structure of a battery module can be customized as needed, thus forming a three-level assembly model: lithium-ion cell → battery module → battery pack.

[0004] When designing lithium-ion battery system integration, it is necessary to consider abnormal situations such as thermal runaway of individual cells. This results in a large amount of high-temperature, high-pressure gas appearing inside the battery pack. To prevent the battery pack from exploding, a certain number of pressure relief and explosion-proof valves need to be installed on the battery pack. This solution has been maturely applied in many power and energy storage battery systems. Although this method can guide pressure relief, it cannot completely prevent the gas-liquid-solid mixture ejected during cell thermal runaway. When a single cell depressurizes, it usually carries out the electrolyte and positive and negative lithium electrode materials. These materials, once ejected into the battery pack, will spread over a large area and come into contact with various circuits, causing dangers such as arcing and short circuits. Utility Model Content

[0005] The technical problem this invention aims to solve is that when a single battery cell is depressurized, it is easy to cause dangers such as electric arcs and short circuits. In view of the problems existing in the prior art, this invention provides a new type of battery module.

[0006] The purpose and effects of this utility model are achieved by the following specific technical means: A novel battery module includes a base plate on which a battery pack is mounted. The battery pack is composed of multiple individual battery cells arranged in parallel, and the outer wall of each individual battery cell is provided with a pressure relief section. An outer cover is installed on the outside of the base plate, and the inner wall of the outer cover is fixed with several columns of channels that are the same as the number of battery cells. The bottom of the channel is provided with a connection interface, and the connection interface corresponds to the pressure relief part. The area of ​​the connection interface is greater than or equal to the area of ​​the pressure relief part. The interior of the channel is hollow, and a pressure relief valve is provided at the outer end of the outer cover. The pressure relief valve is located on the side of the channel away from the interface. This design allows for pressure relief and blockage through the channel, preventing the large-scale diffusion of the gas-liquid-solid mixture and avoiding potential dangers.

[0007] A further preferred embodiment: the individual battery cell is a square-shell battery cell, end plates are provided on both sides of the battery pack, and steel strips are installed on the outside of the battery pack to clamp all the battery packs and end plates, which can assemble the entire module and ensure structural strength.

[0008] A further preferred embodiment: a sealing strip is provided between the battery pack and the channel, and the sealing strip is tightly adhered to both; the sealing strip has openings corresponding to the pressure relief section and the interface. Furthermore, the sealing strip has at least two large end faces made of foam material, and the large end face of the sealing strip is an adhesive surface. This design allows the sealing strip to make close contact with the battery pack and channels.

[0009] A further preferred embodiment: the outer cover covers all the battery packs, and the channel is provided on the inner wall of the outer cover in a concave or convex shape, and the channel is in a closed state.

[0010] A further preferred embodiment: the height of the channel is ≥0.2mm.

[0011] The beneficial effects of this utility model are: When a single battery cell explodes, pressure is ejected from the pressure relief section, along with a gas-liquid-solid mixture. The internal space of the channel provides pressure relief. Since there is no electrical system inside the channel, it can play a role in thermoelectric separation. Furthermore, the channel lacks flammable conditions, effectively controlling the rate of thermal ignition and isolating the circuit to prevent short circuits or arcing in other battery cells. The pressure relief valve will then open to release pressure and discharge the gas pressure to the outside. This design, which integrates a pressure relief channel with an explosion-proof valve in the cover, ensures that the gas-liquid-solid mixture ejected during thermal runaway of the battery cell can be smoothly discharged into the pressure relief channel, meeting the thermoelectric separation requirements after thermal runaway of the battery cell. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram showing the overall structure of this utility model broken down. Figure 2 This is a schematic diagram showing the overall structure of this utility model broken down. Figure 3This is a bottom view of the outer cover structure of this utility model; Figure 4 This is a cross-sectional view of the outer cover structure of this utility model; Figure 5 This is a cross-sectional view of the overall structure of this utility model; Figure 6 This is an assembly diagram of the overall structure of this utility model.

[0014] Figures 1-6 In the middle: base plate (1), battery pack (2), pressure relief part (201), sealing strip (3), outer cover (4), channel (401), interface (402), pressure relief valve (5). Detailed Implementation

[0015] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are merely examples for implementing this utility model. It must be pointed out that the disclosed embodiments do not limit the scope of this utility model. On the contrary, any modifications and refinements made without departing from the scope of this utility model are within the patent protection scope of this utility model.

[0016] Please see Figures 1-2 A novel battery module includes a base plate 1 on which a battery pack 2 is mounted. The battery pack 2 is composed of multiple parallel-arranged individual battery cells, which are prismatic cells (e.g., ...). Figure 1 The battery pack 2 has two rows, each equipped with six individual cells. The individual cells are separated by an elastic buffer material layer to prevent mutual compression caused by expansion. The outer wall of the individual cell is provided with a pressure relief part 201, which is preferably located on the side away from the base plate 1. The battery pack 2 has end plates on both sides. There are two steel strips on the outside of the end plates. The steel strips are distributed vertically and clamp all the battery pack 2 and end plates together. After the individual cells are integrated, external electrical connection lines and liquid cooling systems, such as busbars, BMS systems and liquid cooling pipes, can be installed.

[0017] For preferred options, please refer to [link / reference]. Figures 1-5 The outer cover 4 is installed on the base plate 1 by bolts. The outer cover 4 covers all battery packs 2. The inner wall of the outer cover 4 is fixed with several rows of channels 401, which are the same number as the number of battery cells. One channel 401 corresponds to one row of battery packs 2. (e.g.) Figure 4The channel 401 is convex and abuts against the battery pack 2. The bottom of the channel 401 has a docking interface 402, which corresponds to the pressure relief part 201 of each individual cell. A sealing strip 3 is provided between the battery pack 2 and the channel 401. The upper and lower two end faces of the sealing strip 3 are respectively glued to the outer wall of the channel 401 and the outer wall of the battery pack 2. At least two of the large end faces of the sealing strip 3 are made of foam material, or foam material can be used for the design. The deformable characteristics of foam material make the sealing strip 3 more tightly connected to the channel 401 and the battery pack 2, improving the fit. Furthermore, the sealing strip 3 has openings corresponding to the pressure relief part 201 and the interface 402. The area of ​​the openings is larger than the area of ​​the pressure relief part 201 and the interface 402, so as to prevent the sealing strip 3 from blocking the normal communication between the pressure relief part 201 and the interface 402. For preferred options, please refer to [link / reference]. Figure 2 and Figures 4-6 The interior of channel 401 is hollow, and a pressure relief valve 5 is provided at the outer end of the outer cover 4. The pressure relief valve 5 is located on the side of channel 401 away from the interface 402. When a single cell bursts, pressure is ejected from the pressure relief part 201, along with a gas-liquid-solid mixture. The area of ​​interface 402 is greater than or equal to the area of ​​pressure relief part 201. Pressure is released into channel 401 through interface 402. Interface 402 and pressure relief valve 5 are offset vertically. Therefore, the upper part of interface 402 corresponds to the upper wall of channel 401, which can act as a barrier to prevent pressure from directly rushing out of pressure relief valve 5 and failing to achieve the effect of thermoelectric separation. The interior space of channel 401 can be used for pressure relief. Since there is no circuit system inside channel 401, it can achieve the effect of thermoelectric separation. In addition, channel 401 lacks flammable conditions, effectively controlling the thermal ignition speed and isolating the circuit to avoid affecting other single cells, such as short circuits and arcs. Furthermore, in the actual product design, the opening threshold of the pressure relief section 201 is 0.6 kPa-0.9 kPa. As the individual battery cells continuously release gas pressure, the gas pressure accumulates inside the channel 401 to reach the opening threshold of the pressure relief valve 5, which is about 2.5 kPa-4 kPa. The pressure relief valve 5 will then open. The threshold of the pressure relief valve 5 can be designed according to the usage requirements of those skilled in the art. The pressure relief valve 5 discharges the gas pressure to the outside. Through this design of integrating the pressure relief channel 401 with the explosion-proof valve, the gas-liquid-solid mixture ejected during the thermal runaway of the battery cell can be smoothly discharged into the pressure relief channel 401, thus meeting the thermoelectric separation requirements after the thermal runaway of the battery cell.

Claims

1. A novel battery module, comprising a base plate on which a battery pack is mounted, wherein the battery pack is composed of multiple parallel-arranged individual battery cells, and each individual battery cell has a pressure relief portion on its outer wall, characterized in that: An outer cover is installed on the outside of the base plate, and the inner wall of the outer cover is fixed with several columns of channels that are the same as the number of battery cells. The bottom of the channel is provided with a connection interface, and the connection interface corresponds to the pressure relief part. The area of ​​the connection interface is greater than or equal to the area of ​​the pressure relief part. The interior of the channel is hollow, and a pressure relief valve is provided at the outer end of the outer cover. The pressure relief valve is located on the side of the channel away from the interface.

2. The novel battery module according to claim 1, characterized in that: The individual battery cell is a square-shell battery cell. End plates are provided on both sides of the battery pack, and a steel strip is installed on the outside of the battery pack to clamp all the battery packs and end plates.

3. The novel battery module according to claim 1, characterized in that: A sealing strip is provided between the battery pack and the channel, and the sealing strip is tightly adhered to both. The sealing strip has openings corresponding to the pressure relief part and the interface.

4. A novel battery module according to claim 3, characterized in that: The sealing strip has at least two large end faces made of foam material, and the large end face of the sealing strip is an adhesive surface.

5. A novel battery module according to claim 1, characterized in that: The outer cover covers all the battery packs, and the channel is located on the inner wall of the outer cover and is either concave or convex, and the channel is in a closed state.

6. A novel battery module according to claim 1, characterized in that: The height of the channel is ≥0.2mm.

7. A novel battery module according to claim 1, characterized in that: The interface is offset from the pressure relief valve in the vertical direction.

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