A battery system

Abstract

This utility model discloses a battery system belonging to the field of power battery technology. The battery system includes at least one cell module, which comprises multiple cell units spaced along a second direction and spacer components disposed between adjacent cell units. The spacer components have a protruding structure at the explosion-proof valve position of each individual cell. By placing spacer components between adjacent cell units, the impact of high-velocity jets ejected after thermal runaway from high-nickel ternary batteries, lithium iron manganese batteries, and semi-solid-state batteries on the aluminum shells of surrounding cells can be effectively blocked, preventing the formation of lateral jets. This not only ensures the safety of the explosion-proof valve of each individual cell but also prevents thermal runaway caused by lateral jets in adjacent cells, thereby suppressing the spread of thermal runaway between cells and reducing the occurrence of safety accidents.

Description

Technical Field

[0001] This utility model belongs to the field of power battery technology, and specifically relates to a battery system. Background Technology

[0002] Currently, the lithium battery industry is showing a significant trend towards higher energy density, especially with the increasingly widespread application of large-capacity battery pack systems. However, the increase in energy density is often accompanied by a simultaneous increase in safety risks, making research on improving lithium battery safety an urgent need for the industry, with research on the thermal safety of power batteries being a core and crucial aspect.

[0003] In battery systems, thermal runaway manifests in various forms. Specifically, when a single cell in a high-nickel ternary lithium battery, lithium iron manganese battery, or semi-solid-state battery experiences thermal runaway, it ejects a high-velocity, high-temperature, and high-pressure jet. This jet easily melts the aluminum casing surrounding the cell's explosion-proof valve, causing the jet direction to become uncontrollable and forming a lateral jet. This lateral jet affects surrounding cells and their explosion-proof valves through impact and ablation, triggering subsequent thermal runaway in the surrounding cells, ultimately leading to a chain reaction of thermal runaway within the battery system, resulting in serious safety accidents such as fires and explosions. Utility Model Content

[0004] The purpose of this invention is to provide a battery system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a battery system, comprising at least one cell module, wherein the cell module comprises a plurality of cell units arranged at intervals along a second direction and a separator component disposed between adjacent cell units, wherein the cell unit comprises at least one single cell, and the separator component comprises a heat insulation layer and a limiting frame disposed around the heat insulation layer, and the separator component has a protruding structure at the explosion-proof valve position of the single cell.

[0006] This application, by setting a spacer component between adjacent battery cells, can effectively block the impact of high-velocity jets ejected from high-nickel ternary batteries, iron-manganese lithium batteries, and semi-solid-state batteries after thermal runaway on the aluminum shells of surrounding battery cells, and avoid the formation of lateral jets. This not only ensures the safety of the explosion-proof valve of a single battery cell, but also prevents adjacent battery cells from experiencing thermal runaway due to lateral jets, thereby suppressing the spread of thermal runaway between battery cells and reducing the occurrence of safety accidents.

[0007] Furthermore, the width of the protruding structure is greater than the width of the explosion-proof valve of a single battery cell.

[0008] Furthermore, the heat insulation layer is an aerogel layer or a foam layer.

[0009] Furthermore, the limiting frame is made of silicone material.

[0010] Furthermore, the battery system also includes mica paper attached to the upper surface of the cell module, and the mica paper has an opening at the protruding structure position for the protruding structure to pass through.

[0011] Furthermore, the battery system also includes an epoxy board unit attached to the surface of the mica paper, the epoxy board unit comprising two epoxy board bodies respectively disposed on both sides of the protruding structure in a first direction.

[0012] Furthermore, the battery system includes multiple cell modules, and the battery system also includes a first connecting piece assembled at a first end of the cell module and a second connecting piece assembled at a second end of the cell module. Individual cells in a single cell module are connected through the first connecting piece, and individual cells between adjacent cell modules are connected through the second connecting piece.

[0013] Furthermore, the first connecting piece is an L-shaped connecting piece, and the second connecting piece is a U-shaped connecting piece.

[0014] Furthermore, the battery system also includes a data acquisition unit, which is connected to the first connecting piece, the second connecting piece, and the external acquisition terminal.

[0015] Furthermore, the battery cell module is provided with protective plates at both ends in the second direction. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the internal structure of the battery system.

[0017] Figure 2 This is a partial top view of the battery system;

[0018] Figure 3 This is a schematic diagram of the partition component;

[0019] Figure 4 This is a schematic diagram of the overall battery system.

[0020] In the picture:

[0021] 10. Battery cell module; 100. Battery cell unit; 101. Single battery cell; 102. Explosion-proof valve;

[0022] 200. First connecting piece; 201. Second connecting piece;

[0023] 300. Partition component; 301. Limiting frame; 302. Thermal insulation layer; 303. Protruding structure;

[0024] 400. Mica paper; 401. Epoxy board unit; 402. Epoxy board body;

[0025] 500, Data acquisition unit; 501, Integrated board; 502, Protection board. Detailed Implementation

[0026] 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.

[0027] For ease of description, the location descriptions in this application are as follows: Figure 2 Based on the central direction, and given that the single cell 101 in this application is a side-out tab type cell, the first direction is configured as the length direction of the subsequent single cell 101, and the tab of the single cell 101 is disposed at the end in the first direction. The second direction is configured as the thickness direction of the subsequent single cell 101 and the stacking direction of the single cell 101. The third direction is configured as the height direction of the single cell 101.

[0028] A battery system configured as, for example, a high-nickel ternary battery, a lithium iron manganese battery, or a semi-solid-state battery system, see reference. Figure 2 The battery system includes at least one cell module 10. Each cell module 10 is composed of multiple cell units 100 spaced along a second direction. Each cell unit 100 includes at least one individual cell 101. Exemplarily, when a cell unit 100 includes multiple individual cells 101, the multiple individual cells 101 are stacked along the second direction to form the cell unit 100. Exemplarily, the aforementioned individual cell unit 100 is formed by stacking two individual cells 101. In some embodiments, refer to... Figure 1 The aforementioned battery system includes multiple cell modules 10, which are spaced apart along a first direction. Each cell module 10 has a first end and a second end in a second direction. The first end serves as the connection end for a single cell 101 within the cell module 10, and the second end serves as the connection end for the cell module 10. Correspondingly, the battery system also includes a first connecting piece 200 mounted on the first end of the cell module 10 and a second connecting piece 201 mounted on the second end of the cell module 10. In this case, the single cells 101 of adjacent cell modules 10 are connected via the second connecting piece 201, meaning the single cells 101 of adjacent cell modules 10 are connected in series via the second connecting piece 201. For example, the second connecting piece 201 is configured as a U-shaped connecting piece. Correspondingly, the single cells 101 in a single cell module 10 are connected via the first connecting piece 200. For example, the single cells 101 in adjacent cell units 100 are connected in parallel via the first connecting piece 200. Continuing to refer to... Figure 1The battery system also includes a data acquisition unit 500 for collecting operating data of the individual cell 101. The data acquisition unit 500 is configured as, for example, a flexible printed circuit board and is connected to the first connecting piece 200 and the external acquisition terminal. For example, the data acquisition unit 500 is disposed on the upper surface of the cell module 10. Correspondingly, the first connecting piece 200 has a first part attached to the upper surface of the individual cell 101 and a second part attached to the outer end face of the terminal post of the individual cell 101. At this time, the first connecting piece 200 is generally configured as an L-shaped connecting piece.

[0029] Reference Figure 4 The battery system also includes an integrated plate 501 mounted on the outer end of the first connecting piece 200 in the first direction and a protective plate 502 disposed at both ends of the cell module 10 in the second direction.

[0030] In some embodiments, refer to Figure 3 and combined Figure 1 The battery system further includes a spacer component 300 disposed between adjacent cell units 100. Specifically, the spacer component 300 includes a heat insulation layer 302 and a limiting frame 301 disposed around the heat insulation layer 302. The limiting frame 301 is made of silicone material, and the heat insulation layer 302 is an aerogel layer or a foam layer. In some embodiments, the spacer component 300 has a protruding structure 303 corresponding to the position of the explosion-proof valve 102 of the individual cell 101, and the length of the protruding structure 303 in the first direction (i.e., the width of the protruding structure 303) is greater than the explosion-proof valve of the individual cell 101. The width of the explosion valve 102 is such that the spacer component 300 is roughly configured as a convex-shaped component. Based on this spacer component 300, it is possible to prevent high-speed, high-temperature and high-pressure jets from being ejected after thermal runaway of high-nickel ternary batteries, iron-manganese lithium batteries, and semi-solid batteries, which would melt the aluminum shell of the cell around the explosion valve 102 of the cell, thereby making the jet direction uncertain and forming a transverse jet. This jet would impact and ablate the aluminum shell of the cell around the cell and the explosion valve 102 of the cell, triggering thermal runaway of the cell and causing thermal runaway to spread in the system, thus leading to safety accidents such as battery system fire and explosion.

[0031] In some embodiments, refer to Figure 4 The battery system also includes a mica paper 400 disposed on the upper surface (the side end face facing upwards) of the cell module 10, and the mica paper 400 has an opening at the position of the protruding structure 303 for the protruding structure 303 to pass through. In some embodiments, the battery system also includes an epoxy board unit 401 attached to the upper surface of the mica paper 401. Specifically, the epoxy board unit 401 includes two epoxy board bodies 402 respectively disposed on both sides of the protruding structure 303 in the first direction.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A battery system characterized by, The battery module (10) includes at least one battery cell module (10), which includes a plurality of battery cell units (100) arranged at intervals along a second direction and a spacer member (300) disposed between adjacent battery cell units (100). The battery cell unit (100) includes at least one single battery cell (101). The spacer member (300) includes a heat insulation layer (302) and a limiting frame (301) disposed around the heat insulation layer (302). The spacer member (300) has a protruding structure (303) at the explosion-proof valve (102) position of the single battery cell (101).

2. The battery system of claim 1, wherein: The width of the protruding structure (303) is greater than the width of the explosion-proof valve (102) of the single cell (101).

3. The battery system of claim 1, wherein: The heat insulation layer (302) is an aerogel layer or a foam layer.

4. The battery system of claim 1, wherein: The limiting frame (301) is made of silicone material.

5. The battery system of claim 1, wherein: The battery system also includes mica paper (400) attached to the upper surface of the cell module (10), and the mica paper (400) has an opening at the position of the protruding structure (303) for the protruding structure (303) to pass through.

6. The battery system of claim 1, wherein: The battery system also includes an epoxy board unit (401) attached to the upper surface of the mica paper (400), the epoxy board unit (401) including two epoxy board bodies (402) respectively disposed on both sides of the protrusion structure (303) in a first direction.

7. The battery system of claim 1, wherein: The battery system includes multiple cell modules (10), and the battery system also includes a first connecting piece (200) assembled at the first end of the cell module (10) and a second connecting piece (201) assembled at the second end of the cell module (10). The individual cells (101) in a single cell module (10) are connected through the first connecting piece (200), and the individual cells (101) between adjacent cell modules (10) are connected through the second connecting piece (201).

8. The battery system of claim 7, wherein: The first connecting piece (200) is an L-shaped connecting piece, and the second connecting piece (201) is a U-shaped connecting piece.

9. The battery system of claim 7, wherein: The battery system also includes a data acquisition unit (500), which is connected to a first connecting piece (200), a second connecting piece (201), and an external acquisition terminal.

10. The battery system of claim 1, wherein: The battery cell module (10) has protective plates (502) at both ends in the second direction.

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