Battery system for preventing battery thermal runaway short circuit

Abstract

The utility model discloses a battery system for preventing battery thermal runaway short circuit, and belongs to the technical field of power battery thermal safety. The utility model provides a battery system for preventing thermal runaway and short circuit of a battery, which comprises a plurality of battery cell groups consisting of a plurality of battery cells, and the plurality of battery cell groups are arranged side by side; an insulating heating film is arranged between the battery cell groups, extends from one end of the battery cell to the other end of the battery cell, and extends outwards for a certain distance from the shoulder part of the battery cell. According to the utility model, the insulating heating film is arranged between the battery cell groups, so that the battery cells on the two sides can be heated, and the battery cells on the two sides can be insulated and isolated. The insulating heating film extends outwards for a certain distance from the shoulder part of the battery cell, so that the short circuit of the system caused by arc discharge formed on the shoulder part between the high-voltage battery cell groups is avoided, and the risk of failure of the battery system is reduced.

Description

Technical Field

[0001] This utility model relates to the field of power battery thermal safety technology, specifically to a battery system for preventing battery thermal runaway and short circuit. Background Technology

[0002] As lithium batteries advance towards higher energy densities, especially in large-capacity battery pack systems, increasingly higher safety risks arise, necessitating research to improve their safety. A key issue is the study of thermal runaway in power batteries. Thermal runaway manifests in various forms, and for large-capacity CTP systems, the voltage difference between modules is significant, particularly between the overall positive and negative voltages, which can often reach hundreds or even thousands of volts, posing a severe challenge to system safety. Utility Model Content

[0003] 1. Technical problem to be solved by the utility model

[0004] This invention provides a battery system that prevents thermal runaway short circuits, which can prevent thermal runaway short circuits in high voltage difference PACK systems and avoid the risk of large-capacity power battery systems experiencing large-scale short circuits during operating conditions or thermal runaway.

[0005] 2. Technical Solution

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0007] This invention provides a battery system for preventing thermal runaway and short circuits, comprising multiple cell groups composed of multiple battery cells, arranged side-by-side. An insulating heating film is disposed between the cell groups, extending from one end of each cell to the other, and further outward from the shoulder of the cell. This invention uses an insulating heating film between cell groups to both heat the cells on both sides and provide insulation. The outward extension of the insulating heating film from the shoulder of the cell prevents short circuits caused by arcing between high-voltage cell groups at the shoulder, thereby reducing the risk of battery system failure.

[0008] As a further improvement to this utility model, a tray is provided on the multiple battery cell assemblies, and a groove is formed on the tray with a recess towards the non-cell side. The protruding end of the insulating heating film is located within the groove. This arrangement structurally avoids bending of the insulating heating film by other components, thus preventing a decrease in its protective effect.

[0009] As a further improvement of this utility model, in the battery cell assembly, a high-temperature resistant protective layer is attached to the electrode plates of the battery cells in the high-voltage battery cell assembly. This design prevents electrolyte and solid particles from falling into the electrode area of ​​the battery cell assembly after thermal runaway, which could cause the electrode plates to conduct or melt the blue film of the battery cell to form a circuit, thereby leading to a local or even system short circuit.

[0010] As a further improvement of this utility model, the tray includes a substrate, and several slots are provided on both sides of the substrate, in which the electrode of the battery cell is disposed. This arrangement can fix the electrode, and the slots can also securely fix the high-temperature resistant protective layer to the electrode, preventing the protective layer from loosening.

[0011] As a further improvement to this utility model, explosion-proof valve holes are formed on the substrate of the tray. These explosion-proof valve holes are located at the high-voltage battery cell assembly positions, and the explosion-proof valves on the cells in the high-voltage battery cell assembly correspond one-to-one with the explosion-proof valve holes. Since the explosion-proof valves of the high-voltage battery cell assembly are easier to break open, and once broken, corrosive contents such as electrolytes inside will splash higher, this design ensures that when the explosion-proof valve breaks, the splashed contents will not be blocked.

[0012] As a further improvement of this utility model, an FPC assembly is provided on the tray, the FPC assembly including a first assembly and / or a second assembly; the FPC assembly is connected to the electrode plates of multiple battery cells respectively. The first assembly includes a first bushead and multiple wires, one end of each wire is connected to an electrode plate, and the other end is connected to the first bushead. The second assembly includes a second bushead and a busbar, the busbar is connected to the electrode plate through contacts, and the end of the busbar is connected to the second bushead. A clearance groove for avoiding the explosion-proof valve is provided on the busbar. With this configuration, when the first assembly is used, the covering material on the wires is removed, saving more space and thus not blocking the explosion-proof valve orifice. When the second assembly is used, the clearance groove on the busbar can also avoid the explosion-proof valve.

[0013] As a further improvement of this utility model, in the battery cell assembly, the two electrodes on all the cells are arranged in two rows, and the explosion-proof valves on the cells are arranged in one row. This arrangement makes the battery more organized, thereby reducing the space occupied by each component and increasing the battery density.

[0014] 3. Beneficial effects

[0015] Compared with existing known technologies, the technical solution provided by this utility model has the following significant advantages:

[0016] This utility model provides a battery system for preventing thermal runaway and short circuits. By setting multiple protections for the battery system, protective measures are set on the shoulder of the cell assembly, the electrode plates of the cell, the tray, and the FPC assembly, thereby ensuring that a large-capacity power battery system will not experience large-scale short circuits during operating conditions or thermal runaway. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the cell assembly in the battery system of this utility model;

[0018] Figure 2 This is a schematic diagram of the battery cell assembly of this utility model without the end plate;

[0019] Figure 3 This is a schematic diagram of the structure of the tray in this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the first component in the FPC assembly of this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the second component in the FPC assembly of this utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the battery cell assembly without the tray in this utility model;

[0023] Figure 7 This is a cross-sectional view of the battery cell assembly of this utility model;

[0024] Figure 8 for Figure 7 A magnified view of the structure in the middle.

[0025] Explanation of the labels in the diagram:

[0026] 1. Side plate; 2. Tray; 21. Base plate; 22. Slot; 23. Explosion-proof valve hole; 24. Groove; 3. FPC assembly; 31. First assembly; 311. First busbar; 312. Wire; 32. Second assembly; 321. Second busbar; 322. Busbar plate; 323. Contact; 324. Relief groove; 4. End plate; 5. Insulating heating film; 6. Battery cell; 61. Electrode; 62. Explosion-proof valve; 63. Protective layer; 64. First battery cell assembly; 65. Second battery cell assembly. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0030] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0033] Example

[0034] Combination Figure 1 and Figure 6 This embodiment of a battery system for preventing thermal runaway short circuits includes multiple cell groups, each containing multiple cells 6. The multiple cell groups are arranged side-by-side and connected by conductive components. Depending on the connection order, due to potential accumulation, one or more high-voltage cell groups may emerge. These high-voltage cell groups, with their higher voltage, are more prone to short circuits compared to other cell groups. The cell groups in this embodiment include at least a first cell group 64 and a second cell group 65, arranged side-by-side. Each cell 6 has an electrode 61 and an explosion-proof valve 62. The electrode 61 is connected to the tab of the cell 6. The explosion-proof valve 62 is positioned between two electrode 61s. In one cell group, the electrode 61s are arranged in two rows on each side of the cell group, and the explosion-proof valve 62s are arranged in one row in the middle of the cell group. Both the electrode 61s and the explosion-proof valve 62 are located on the upper surface of the cell 6. In this embodiment, a protective layer 63 is attached to the electrode 61 of the cell 6 in the high-voltage cell assembly. The protective layer 63 is an insulating and high-temperature resistant material. When the explosion-proof valve 62 breaks, the protective layer 63 can protect the electrode 61 and prevent it from being corroded by the splashed contents, which could lead to a short circuit. In this embodiment, the protective layer 63 is made of ceramic tape.

[0035] Combination Figure 2 , Figure 7-Figure 8In this embodiment, an insulating heating film 5 is provided between the battery cell groups. The insulating heating film 5 extends from one end of the battery cell 6 to the other end of the battery cell 6, and extends outward from the shoulder of the battery cell 6 for a certain distance. In this embodiment, the shoulder refers to the two corner positions of the end face where the electrode plate 61 is located (i.e., Figure 8 (Location B in the middle). Due to the high voltage of the high-voltage battery cell group, voltage arcing is prone to occur at the shoulder position between it and adjacent battery cell groups, leading to a short circuit. In this embodiment, the insulating heating film 5 is lengthened to avoid short circuits between battery cell groups. In this embodiment, the insulating heating film 5 is made of epoxy composite vulcanized silicone, which has better insulation performance, and can both heat the battery cells on both sides and insulate them.

[0036] Combination Figure 8 In this embodiment, a tray 2 is placed over multiple battery cell groups. A groove 24 is formed on the tray 2 that is recessed towards the non-cell 6 side. The protruding end of the insulating heating film 5 is located within the groove 24. This embodiment provides an installation position for the insulating heating film 5 by providing the groove 24 on the tray 2, thereby preventing other components from squeezing the insulating heating film 5, causing it to bend and thus failing to provide insulation between the two battery cell groups. Figure 3 In this embodiment, the tray 2 also includes a base plate 21. Several slots 22 are provided on both sides of the base plate 21, and the electrode plates 61 of the battery cell 6 are disposed in the slots 22. An explosion-proof valve hole 23 is formed on the base plate 21 of the tray 2. The explosion-proof valve hole 23 is located at the position of the high-voltage battery cell assembly, and the explosion-proof valve 62 on the battery cell 6 in the high-voltage battery cell assembly corresponds one-to-one with the explosion-proof valve hole 23. Since the explosion-proof valve 62 of the high-voltage battery cell assembly is easier to break open, and once broken, the corrosive contents such as electrolyte inside will splash higher, this design ensures that when the explosion-proof valve 62 breaks, the splashed contents will not be blocked.

[0037] Combination Figures 4-5In this embodiment, an FPC assembly 3 is provided on the tray 2. The FPC assembly 3 includes a first assembly 31 and / or a second assembly 32. The FPC assembly 3 is connected to the electrode 61 of a plurality of battery cells 6. The first assembly 31 includes a first busbar 311 and multiple wires 312, one end of which is connected to the electrode 61, and the other end is connected to the first busbar 311. The second assembly 32 includes a second busbar 321 and a busbar plate 322. The busbar plate 322 is connected to the electrode 61 via contacts 323, and its end is connected to the second busbar 321. A clearance groove 324 is provided on the busbar plate 322 to allow passage of the explosion-proof valve 62. In this embodiment, the first assembly 31 removes the covering material from the wires 312, saving more space and thus not obstructing the explosion-proof valve hole 23. The clearance groove 324 on the manifold 322 of the second component 32 can also allow the explosion-proof valve 62 to pass. In this embodiment, either the first component 31 or the second component 32 can be selected, or both can be provided.

[0038] In this embodiment, a side plate 1 is provided on the side of the battery cell assembly and an end plate 4 is provided at the end to isolate the battery cell assembly from the outside world, so as to avoid damage to the outside world and to prevent the external environment from interfering with the battery cell assembly.

[0039] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the inventive purpose of the present invention, designs a structure and embodiment similar to the technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A battery system for preventing thermal runaway short circuits, characterized in that, It includes multiple battery cell groups consisting of multiple battery cells (6), which are placed side by side; an insulating heating film (5) is provided between the battery cell groups, which extends from one end of the battery cell (6) to the other end of the battery cell (6) and extends outward from the shoulder of the battery cell (6) for a certain distance.

2. The battery system for preventing thermal runaway short circuits according to claim 1, characterized in that, The multiple battery cell groups are covered with a tray (2), and the tray (2) is recessed towards the non-battery cell (6) side to form a groove (24), and the extended end of the insulating heating film (5) is located in the groove (24).

3. The battery system for preventing thermal runaway short circuits according to claim 1, characterized in that, In the aforementioned battery cell assembly, the electrode (61) of the high-voltage battery cell assembly is covered with a high-temperature resistant and anti-permeability protective layer (63).

4. A battery system for preventing thermal runaway short circuits according to claim 2, characterized in that, The tray (2) includes a substrate (21), and several slots (22) are provided on both sides of the substrate (21). The electrode (61) of the battery cell (6) is disposed in the slot (22).

5. A battery system for preventing thermal runaway short circuits according to claim 2, characterized in that, An explosion-proof valve hole (23) is opened on the substrate (21) of the tray (2). The explosion-proof valve hole (23) is located at the position of the high-voltage battery cell group. The explosion-proof valve (62) on the battery cell (6) in the high-voltage battery cell group corresponds one-to-one with the explosion-proof valve hole (23).

6. A battery system for preventing thermal runaway short circuits according to claim 5, characterized in that, An FPC assembly (3) is provided on the tray (2), the FPC assembly (3) includes a first assembly (31) and / or a second assembly (32); the FPC assembly (3) is connected to the electrode (61) of a plurality of cells (6).

7. A battery system for preventing thermal runaway short circuits according to claim 6, characterized in that, The first component (31) includes a first bus head (311) and wires (312). The wires (312) include a plurality of wires, one end of which is connected to an electrode (61) and the other end is connected to the first bus head (311).

8. A battery system for preventing thermal runaway short circuits according to claim 6, characterized in that, The second component (32) includes a second bus head (321) and a bus plate (322). The bus plate (322) is connected to the electrode (61) via a contact (323), and the end of the bus plate (322) is connected to the second bus head (321).

9. A battery system for preventing thermal runaway short circuits according to claim 8, characterized in that, The manifold (322) has a clearance groove (324) for avoiding the explosion-proof valve (62).

10. A battery system for preventing thermal runaway short circuits according to any one of claims 1-9, characterized in that, In the battery cell assembly, the two electrodes (61) on all the cells (6) are arranged in two rows, and the explosion-proof valves (62) on the cells (6) are arranged in one row.

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